Disclosed is a synthetic resin container provided with an inverting, foldback bottom wall that can maintain a stable, self-supporting position while being able to minimize the amount of residual contents, and that can be formed by blow-molding, etc., and maintain the favorable producibility or low cost of the past. The synthetic resin container is provided with a bottom wall that forms the bottom of the container, and a drum section that is united to the perimeter of the bottom wall and forms a filling space M for contents on the inside, and is a synthetic resin container wherein a raised bottom is formed by inverting and folding back said bottom wall toward said drum section. Said drum section has a lower peripheral wall that touches or approaches the outer wall part of said bottom wall and forms a self-supporting base by the inversion and folding back of said bottom wall.
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1. A synthetic resin container having a bottom wall for forming a bottom portion of the container, and a body portion connecting integrally with an outer periphery of the bottom wall to define a space for filling a content therein, the bottom wall being inverted and folded back toward the inside of the body portion to form a raised bottom, wherein
the body portion has a lower peripheral wall for forming a self-standing foot by inverting and folding back the bottom wall to bring the lower peripheral wall into contact with or place the lower peripheral wall in proximity to an outer-side wall portion of the bottom wall;
a bending groove is provided at a boundary between the bottom wall and the body portion before inverting and folding back the bottom wall to serve as a starting point for inverting and folding back the bottom wall, the bending groove being protruded outwardly from the bottom portion and defining an annular hollow portion therein after inverting and folding back the bottom wall;
the body portion has a narrowed portion formed around the entire circumference of a lower peripheral wall of the body portion so as to protrude toward the inside of the body portion before inverting and folding back the bottom wall;
the bottom wall before inverting and folding back the bottom wall has an annular rib protruding to the inside of the body portion and brought into contact with the inner surface of a lower peripheral wall of the narrowed portion to form a seal portion between the narrowed portion and the annular rib after inverting and folding back the bottom wall;
the bottom wall is formed by a slanting wall in which an edge portion is at the highest position and a liquid pool is formed at a center region thereof after inverting and folding back the bottom wall; and
the annular hollow portion has a diameter larger than a diameter of the body portion after inverting and folding back the bottom wall.
2. The synthetic resin container according to
the bottom wall has a plurality of ribs directed toward the liquid pool of the bottom wall, each of the ribs having a protruding shape on the undersurface located on the outer side of the container, and a recessed shape on the upper surface located on the inner side of the container.
3. The synthetic resin container according to
the self-standing foot has an inverted V-shaped cross section whose diameter gradually increases from a base portion of the container toward a ground-contacting edge.
4. The synthetic resin container according to
an angle of the lower peripheral wall of the body portion with respect to a horizontal plane and an angle of the outer-side wall portion of the bottom wall with respect to the horizontal plane are equal and in mutually opposite directions before the inverting and folding back of the bottom wall.
5. The synthetic resin container according to
the narrowed portion includes an upper peripheral wall whose diameter gradually increases toward the upper direction, and a lower peripheral wall connected with a lower end of the upper peripheral wall and whose diameter gradually increases toward the downward direction before inverting and folding back the bottom wall.
6. The synthetic resin container according to
the annular hollow portion is provided so as to correspond to a ground-contacting portion located at the lowest end of the self-standing foot portion.
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The present invention relates to a synthetic resin container formed by a blow molding, an injection molding and the like, in which a bottom wall of the container is inverted and folded back toward the inside of a body, and relates particularly to a container suitable as a container for a pump.
As a synthetic resin container for containing shampoo, conditioner, detergent, deodorizing and disinfecting agent, cosmetic and the like, various kinds of containers are commercially available, which have a discharging device such as a pump by which an appropriate amount of content in the container can be extracted. Further, it has become common that, after the content in the container is entirely consumed, the original container (container to be refilled) is reused, by replenishing a new content from a commercially available refill container. By using such a container, resources are effectively reused (see, for example, Japanese Patent Application Laid-open No. 2000-159249, and Japanese Patent Application Laid-open No. 8-230961).
The container described in these references has a mouth and neck portion standing upright from an upper end of a body portion with a bottomed cylindrical shape via a shoulder portion, and is entirely integrally formed. Further, a central region of a bottom portion is raised to form an annular recessed region around the central region of the bottom portion. In general, such a container is often formed by blow molding, and in this case, the center region of the bottom portion tends to rise due to pinch off of the bottom potion.
Preferably, a general container such as described in these references is formed by blow molding for the purpose of favorable productivity, reduction in cost and the like. In this case, however, the central region of the bottom portion described above tends to rise, and hence, there is a possibility that liquid remains in the annular recessed region around the central region. A discharging device such as a pump used with this type of a container is configured such that a sucking pipe is installed vertically in the container, and the lower end of the sucking pipe has an opening in the vicinity of the bottom surface to suck liquid through the opening. If the opening of the sucking pipe is located above the raised region, liquid existing around the raised region remains to be unsucked. Further, even if the sucking pipe is configured to be curved so as to place the opening of the pipe at the periphery of the bottom portion of the container, the liquid often remains in recessed region due to an angle of the tip end of the pipe or the diameter of the pipe or a width of the recess around the raised region.
As one example, the references described above disclose an idea that: a sucking pipe connecting with a sucking port of a pump is bent in the middle of the pipe; a lower end of the pipe is positioned at an edge portion of a bottom wall corresponding to a connection portion with a lower end of a body of the container; and, the content remaining in the container is collected at the edge portion of the bottom wall by inclining the container or other manner, thereby discharging the remaining content. However, it is burdensome for a user to discharge the content while inclining the container, and usability thereof is not good.
Further, forming a container body by means of a molding method capable of giving complicated shapes such as the injection molding, the bottom portion can be shaped relatively freely, whereby it is possible to eliminate the remaining liquid. However, this may cause other problems such as higher cost, lower productivity and the like.
An object of the present invention is to propose a synthetic resin container having an inverted and folded back bottom wall capable of securing a stable self-standing position; minimizing the remaining amount of content; being formed by blow molding and the like; and maintaining the existing favorable productivity or low cost.
The present invention relates to a synthetic resin container which is formed integrally with a synthetic resin, can be formed especially by means of blow molding and the like, and includes a bottom wall for forming a bottom portion of the container, and a body portion connecting integrally with an outer periphery of the bottom wall to define a space for filling a content therein, the bottom wall being inverted and folded back toward the inside of the body portion to form a raised bottom, wherein the body portion has a lower peripheral wall for forming a self-standing foot by inverting and folding back the bottom wall to bring the lower peripheral wall into contact with or place the lower peripheral wall in proximity to an outer-side wall portion of the bottom wall, and a bending groove is provided at a boundary between the body portion and the bottom wall serving as a starting point for inverting and folding back the bottom wall, the bending groove being protruded outwardly from the bottom portion and defining an annular hollow portion therein after inverting and folding back the bottom wall. The bending groove has a cross section of a rounded U-shape or a squared U-shape.
In the synthetic resin container having the configuration described above, it is preferable that the body portion has a narrowed portion (recessed portion) formed around the entire circumference of a lower peripheral wall of the body portion so as to protrude toward the inside of the body portion, and, it is also preferable that the bottom wall has an annular rib (in a shape that protrudes to the inside of the body portion) brought into contact with the inner surface of a lower peripheral wall of the narrowed portion to form a seal portion between the narrowed portion and the annular rib after inverting and folding back the bottom wall.
Further, the hollow portion described above desirably has a larger diameter than that of the body portion. This makes it possible to stabilize the self-standing position of the container.
The bottom wall of the container may be formed by a slanting wall having an edge at the highest position and a liquid pool at a center region thereof. The bottom wall may also have a plurality of ribs directed toward the liquid pool of the bottom wall, each of the ribs having a protruding shape on the undersurface located on the outer side of the container and a recessed shape on the upper surface located on the inner side of the container.
It is particularly desirable that the self-standing foot has an inverted V-shaped cross section whose diameter gradually increases from a base portion (root portion) of the container toward a ground-contacting edge. Also, it is preferable that an angle of the lower peripheral wall of the body portion with respect to a horizontal plane and an angle of the outer-side wall portion of the bottom wall with respect to the horizontal plane are equal and in mutually opposite directions before inverting and folding back of the bottom wall.
Further, the container of the present invention has a mouth and neck portion standing upright from a body portion with a bottomed cylindrical shape via a shoulder portion, and the body portion is formed in a cylindrical shape or elliptically cylindrical shape.
As a discharging device such as a pump applicable to the container according to the present invention, employed may be a discharging device having a known mechanism in which the mouth and neck portion is attached in a state where a sucking pipe is installed vertically in the container, and contained liquid sucked with the sucking pipe is discharged from a nozzle portion of the discharging device. Therefore, it is possible to employ both a discharging device in which the liquid in the container is discharged from the nozzle portion as it is, and a discharging device in which the liquid in the container is discharged from the nozzle portion in a form of foam using a known mechanism.
The present invention may be manufactured firstly in a manner that a wall surface for pressure-contacting, which extends annularly around the body portion and faces downward, is provided at the lower region of the body portion, and a wall for forming the raised bottom is provided so as to extend from a lower edge of the outer-side wall portion extending downward from the lower edge of the body portion. Then, by inverting the outer-side wall portion upward, the outer-side wall portion or a corner region of the outer-side wall portion formed by the outer-side wall and the wall for forming the raised bottom is brought into pressure contact with the wall surface for pressure-contacting, and the wall for forming the raised bottom is elevated to form the raised bottom. With the configuration above, the wall for forming the raised bottom, which is to be a raised bottom, is moved upward while keeping its state as it is, and the raised bottom has a tapered shape in which at least the peripheral edge slopes toward the inside, and hence, the liquid gathers at the central region when the amount of the remaining liquid is low. Therefore, by opening the lower end of the sucking pipe to the center region of the raised bottom, the liquid in the container can be suck up completely.
The wall for pressure-contacting is formed with a part of the wall of the body portion. The outer-side wall portion or a corner region of the outer-side wall portion formed by the outer-side wall and the wall for forming the raised bottom is brought into pressure contact with the wall surface for pressure-contacting, functioning to close the peripheral edge of the raised bottom formed to by inverting the outer-side wall portion upward. The wall for pressure-contacting may be formed in various shapes, provided that the above-described function is possible, and be formed in a horizontal plane facing downward or in an inclined plane.
As for a mechanism of inverting the outer-side wall portion, it is only necessary to adjust the wall thickness of the outer-side wall portion to the extent that the inverting is possible, and, for example, by forming the wall thickness thinner than that of the body portion or the wall for forming the raised bottom, it is possible to easily invert the outer-side wall portion. Note that the wall thickness of the body portion or the wall for forming the raised bottom refers to a thickness of a general synthetic resin bottle. Additionally, it may be possible to form the corner region of the outer-side wall portion formed by the outer-side wall and the wall for forming the raised bottom in an arcuately curved surface to make the inverting easy.
It is preferable that the wall for forming the raised bottom, which becomes the raised bottom after the outer-side wall portion is inverted, is formed to have a thickness with which the wall for forming the raised bottom does not deform by a force acting at the time of inverting the outer-side wall portion. The thickness sizes of the outer-side wall portion and the wall for forming the raised bottom may be set to be either equal or different, provided that the thicknesses are selected as appropriate in a manner that the outer-side wall portion and the wall for forming the raised bottom can achieve the functions described above. If requirements are met, it is not necessary to employ the thickness of the outer-side wall portion as described in the previous paragraph.
A thin hinge may be formed at a boundary between the upper edge of the outer-side wall portion and the body portion.
Therefore, the present invention relates to a container that has a mouth and neck portion standing upright from a body portion with a bottomed cylindrical shape via a shoulder portion, and sucks the liquid in the container by the sucking pipe of the discharging device attached to the mouth and neck portion to discharge the content from the nozzle portion of the discharging device, wherein the body portion has a cylindrical or elliptically cylindrical shape; an annular wall surface for pressure-contacting, which faces downward, is provided at the lower portion of the body portion; a cylindrical outer-side wall portion is provided so as to extend downward from a lower edge of the body portion; a wall for forming the raised bottom formed in a tapered shape that at least a peripheral edge portion of the body portion slopes inward is provided so as to extend from a lower edge of the outer-side wall portion; the outer-side wall portion is formed so as to be able to be inverted upward with the lower edge of the body portion being a center; the outer-side wall portion is inverted upward by pushing up the wall for forming the raised bottom; the outer-side wall portion or a corner region of the outer-side wall portion formed by the wall for forming the raised bottom and the outer-side wall is brought into pressure contact with the wall surface for pressure-contacting; and, the wall for forming the raised bottom is elevated to form the raised bottom.
It may be possible that the wall surface for pressure-contacting constitutes an undersurface of an annular slanting wall provided at a lower portion of the body portion in a manner that the annular slanting wall slants downward toward the outside, and the body portion has, below the annular slanting wall, a large-diameter portion having a large diameter; the outer-side wall portion has the same cylindrical shape as a lower end of the body portion vertically installed at a position lower than a lower edge of the body portion; and, the corner region of the outer-side wall portion formed by the wall for forming the raised bottom and the outer-side wall portion is brought into pressure contact with the wall surface for pressure-contacting by inverting the outer-side wall portion upward.
It may be possible that the wall surface for pressure-contacting constitutes an undersurface of a recessed wall portion provided at a lower portion of the body portion and inwardly recessed; the outer-side wall portion has the same cylindrical shape as a lower end of the body portion vertically installed at a position lower than a lower edge of the body portion; and, the corner region of the outer-side wall portion formed by the wall for forming the raised bottom and the outer-side wall portion is brought into pressure contact with the wall surface for pressure-contacting by inverting the outer-side wall portion upward.
The corner region of the outer-side wall portion formed by the wall for forming the raised bottom and the outer-side wall portion may be formed in an arcuately curved surface.
It may be possible that the wall surface for pressure-contacting constitutes an undersurface of a skirt wall slanting downward toward the outside from a lower end of the body portion; the outer-side wall portion is formed in an inverted-skirt shape that slopes downward toward the inside as opposed to the skirt wall and extends from a lower edge of the skirt wall; and, the outer-side wall portion is brought into pressure contact with the wall surface for pressure-contacting by inverting the outer-side wall portion upward.
The outer-side wall portion may have a wall thickness thinner than those of the body portion and the wall for forming the raised bottom.
A container that stands upright from a cylindrical body portion having a bottom via a shoulder portion to a mouth and neck portion, and sucks the liquid in the container by the sucking pipe of the discharging device attached to the mouth and neck portion to discharge the content from the nozzle portion of the discharging device may be characterized in that: the body portion has a cylindrical or elliptically cylindrical shape; an outer-side wall portion having the same cylindrical shape as the body portion is provided so as to extend downward from a lower edge of the body portion; a wall for forming the raised bottom formed in a tapered shape that at least a peripheral edge portion thereof slopes inward is provided so as to extend from a lower edge of the outer-side wall portion; the outer-side wall portion is formed so as to be able to be inverted upward with the lower edge of the body portion being a center; the outer-side wall portion is inverted upward by pushing up the wall for forming the raised bottom; an outer surface of the outer-side wall portion is brought into contact with a lower end of an inner surface of the body portion to form the raised bottom and, the wall for forming the raised bottom is elevated to form the raised bottom.
The outer-side wall portion after inverted and the lower end of the body portion may be fixed by melting.
According to the present invention, the lower end of the body portion may be formed in a cylindrical or elliptically cylindrical or polygon-cylinder-like shape. Therefore, the upper portion of the body portion may be formed in a shape different from the shape at the lower end thereof, or the entire body portion may be formed in the same cylindrical shape. In this specification, the polygon-cylinder-like shape includes a three-square-cylinder-like body, or five or more-square-cylinder-like body, in addition to the four-square-cylinder-like body illustrated in the drawing as an example. Further, in this specification, the polygon-cylinder-like shape includes a shape in which each corner region is formed in an arcuately curved shape, in other words, so-called corner regions are formed in a curved surface. Yet further, the lower end of the body portion includes a raised bottom that slants downward by way of the outer-side wall portion.
According to the container of the present invention, the outer-side wall portion having a cylindrical shape may include an upper edge continuing to a lower edge of the body portion, and a lower edge having the same plan-view shape as the lower edge of the body portion and slanting downward from one end of the lower edge of the body portion toward the opposing end, and a slanting wall portion extending from the lower edge of the outer-side wall portion may be formed in a slanting-plate-like shape. With this configuration, a slanting raised bottom is formed at the lower portion of the body portion at the time of inverting the outer-side wall portion and the slanting wall portion upward. The slanting wall portion is oriented in any direction in a case where the body portion has a cylindrical or regular-polygon-cylinder-like shape, and is oriented in a direction along the major axis or minor axis in a case where the body portion has an elliptically cylindrical shape.
Then, in the container formed as described above, by pushing the slanting wall portion upward to invert the outer-side wall portion upward, the outer surface of the outer-side wall portion is brought into contact with the lower end portion of the inner surface of the body portion, and the slanting wall portion pivots upward, thereby forming the raised bottom. Therefore, the liquid gathers at the lower portion of the raised bottom when the remaining liquid is low. For this reason, the discharging device used is required to have such characters as described below.
As for a mechanism of inverting the outer-side wall portion, it is only necessary to adjust the wall thickness of the outer-side wall portion to the extent that the inverting is possible, and, for example, by forming the wall thickness of the outer-side wall portion thinner than that of the body portion or the slanting wall portion, it is possible to easily invert the outer-side wall portion. Note that the wall thickness of the body portion or the slanting wall portion refers to a thickness of a general synthetic resin bottle. Further, if the outer-side wall portion is formed in an extremely thin thickness, there may arise a problem in terms of the strength of the outer-side wall portion after the inverting such as the strength resist to pressure and the like at the time when the liquid is injected into the container. In the present invention, the inverted raised bottom inclines and has an area slightly larger than the cross section of the body portion. Therefore, sufficient strength can be obtained even if the outer-side wall portion is formed in a relatively thinner shape, due to an operation that supports the pressure from the upward at the contacting edge between the peripheral edge of the raised bottom and the inner surface of the body portion. Further, the wall thickness is set while considering that the slanting wall portion needs to be forcibly pushed upward at the time of the inverting. Yet further, the inverting becomes easy by forming the corner regions in a thinner wall as compared with the other portions in a case where the body portion has a polygon-cylinder-like shape.
If the requirements described above are met, the thicknesses of the outer-side wall portion and the slanting wall portion may be set to be either equal or different, provided that the thicknesses are appropriately selected such that the outer-side wall portion and the slanting wall portion can achieve the functions described above.
The sucking pipe of the discharging device is bent at the middle portion thereof, and has a predetermined length, so that the lower end of the sucking pipe is open at an edge portion of the bottom portion of the container, and is open at the lowest position of the edge portion of the bottom portion at the time of attaching the container to the discharging device.
Therefore, the present invention relates to a container that stands upright from a cylindrical body portion having a bottom via a shoulder portion to a mouth and neck portion, and sucks the liquid in the container by the sucking pipe of the discharging device attached to the mouth and neck portion to discharge the content from the nozzle portion of the discharging device, wherein: an outer-side wall portion is provided so as to extend downward from a lower edge of the body portion, a slanting wall portion having a slanting-plate-like shape is provided so as to close an opening at a lower end of the outer-side wall portion and extend from a lower edge of the outer-side wall portion; the outer-side wall portion having a tubular shape includes an upper edge continuing to a lower edge of the body portion, and a lower edge having the same plan-view shape as that of the lower edge of the body portion and slanting downward from one end of the lower edge of the body portion toward the opposing end; the outer-side wall portion is formed so as to be able to be inverted upward with the lower edge of the body portion being a center; the outer-side wall portion is inverted upward by pushing up the slanting wall portion; an outer surface of the outer-side wall portion is brought into contact with a lower end of an inner surface of the body portion; and, the slanting wall portion pivots upward with the one end of the lower edge of the body portion being a center to form the raised bottom.
The outer-side wall portion may have a wall thickness thinner than those of the slanting wall portion and the body portion.
A discharging device including a sucking pipe formed in a bent shape, and attached and fixed by screwing a base cap to an outer periphery of the mouth and neck portion is provided with positioning means between the mouth and neck portion and the base cap, for positioning, at the lowest position of the raised bottom, an opening provided at a lower end of the bent sucking pipe at the time of screwing the base cap to the mouth and neck portion.
The present invention may be configured such that, by inverting the outer-side wall portion upward, the outer surface of the outer-side wall portion is brought into contact with the lower end portion of the inner surface of the body portion, and the wall for forming the raised bottom is elevated to form the raised bottom. With this configuration, the wall for forming the raised bottom, which is to be the raised bottom, is moved upward while keeping its state as it is. Further, since the raised bottom is formed in a tapered shape that at least a peripheral edge portion thereof slopes inward, the liquid gathers at the central portion when the remaining liquid is low. Therefore, by positioning the opening provided at the lower end of the sucking pipe at the central portion of the raised bottom, it is possible to completely suck the liquid in the container.
By forming the wall thickness of each corner region thinner than those of the other portions to the degree that can be inverted, it is possible to smoothly perform the inverting and secure the sufficient strength at the outer-side wall portion after the inverting. At this time, the specific thickness may be selected as appropriate depending on the sizes of the container and the like. Further, it may be possible to form the corner region in the arcuately curved shape to facilitate the occurrence of the elastic deformation and make the inverting further easy.
Further, by forming a thin hinge at upper and lower edges of the outer-side wall portion, it is possible to form a sharp corner region, and make the inverting easy. However, this hinge may be omitted, if the inverting is possible without the hinge.
Therefore, the present invention relates to a container that stands upright from a cylindrical body portion having a bottom via a shoulder portion to a mouth and neck portion, and sucks the liquid in the container by the sucking pipe of the discharging device attached to the mouth and neck portion to discharge the liquid from the nozzle portion of the discharging device, wherein: at least a lower end of the body portion has a polygon-cylinder-like shape; an outer-side wall portion having the same cylinder-like shape as the lower end of the body portion is provided so as to extend downward from a lower edge of the body portion; a wall for forming the raised bottom formed in a tapered shape that at least a peripheral edge portion thereof slopes inward is provided so as to extend from a lower edge of the outer-side wall portion; the outer-side wall portion is formed so as to be able to be inverted upward with the lower edge of the body portion being a center; by inverting the outer-side wall portion upward, an outer surface of the outer-side wall portion is brought into contact with a lower end of an inner surface of the body portion; and, the wall for forming the raised bottom to form the raised bottom.
Each corner region of the outer-side wall portion may have a wall thickness thinner than the other portion thereof.
Each corner region of the outer-side wall portion may be formed in an arcuately curved shape.
Upper and lower edge portions of the outer-side wall portion may be connected via a thin hinge with a lower edge of the body portion and a peripheral edge of the wall for forming the raised bottom, respectively.
At the boundary disposed between the body portion and the bottom wall and serving as a starting point for inverting and folding back the bottom wall, there is annularly provided the bending groove having the annular hollow portion therein and protruding outward after inverting and folding back the bottom wall. Therefore, variations in wall thickness do not occur at the boundary because the wall thicknesses of the body portion and the bottom portion need not be changed for the purpose of making the inverting and folding back possible, and the hollow portion improves the cushioning property of the container, whereby it is possible to increase the buckling strength of the container and prevent the deformation of the shoulder portion of the container.
By providing a narrowed portion formed around the entire circumference of a lower peripheral wall of the body portion so as to protrude in the inner direction of the body portion, and, providing an annular rib that protrudes toward the inside and is brought into contact with the inner peripheral wall of the narrowed portion to form a seal portion between the narrowed portion and the annular rib after inverting and folding back the bottom wall, the self-standing foot portion becomes a double structure, whereby it is possible to increase the strength of this portion even if the entire container is formed in a thin thickness. Further, the seal portion formed by the annular rib prevents the content from entering the space formed between the lower peripheral wall of the body portion and the outer-side wall portion of the bottom wall, whereby the appearance of the container does not deteriorate.
The hollow portion has a diameter larger than that of the body portion, and hence, the self-standing position of the container can be stabilized.
The bottom wall is configured by the slanting wall having the highest point at the edge portion thereof and having the liquid pool at the central portion thereof, and plural ribs are formed on the bottom wall so as to be directed toward the liquid pool, whereby it is possible to discharge almost all of the content in the container without the need of bending the sucking pipe of the discharging device (It is possible to employ a straight pipe), which improves the usability. By forming the ribs with the protruding shape on the undersurface that is positioned on the outer side of the container, and with the recessed shape on the top surface that is positioned on the inner side of the container, it is possible to efficiently flow the content into the liquid pool, and to increase the strength of the bottom wall, whereby the bottom wall can be prevented from deforming due to the weight of the content.
The self-standing foot is configured by the annular peripheral wall having the truncated-cone-like shape that gradually increases its diameter from the base portion (root portion) of the container toward the ground-contacting end, and is formed in an inverted V-shape in its cross section, whereby the cushioning property can be improved. This alleviates the force acting from above (force acting at the time of depressing the pressing head), and as a result, the deformation at the shoulder portion of the container can be suppressed.
The angle of the lower peripheral wall of the body portion with respect to a horizontal plane and the angle of the outer-side wall portion of the bottom wall with respect to the horizontal plane are set at an equal angle and in inverted orientation before the inverting and folding back of the bottom wall to form a gentle slope, whereby the bottom wall can be easily inverted and folded back. Further, it is possible to form the self-standing foot in which the lower peripheral wall of the body portion and the outer-side wall portion of the bottom wall are reliably brought into close contact with each other.
The wall for forming the raised bottom formed in a tapered shape that at least a peripheral edge portion thereof slopes inward is provided so as to extend from the lower edge of the outer-side wall portion; by inverting the outer-side wall portion upward, the outer-side wall portion or the corner region formed by the wall for forming the raised bottom and the outer-side wall portion is brought into pressure contact with the wall surface for pressure-contacting formed at the lower portion of the body portion; and, the wall for forming the raised bottom is elevated to form the raised bottom, whereby it is possible to prevent the liquid from remaining on the raised bottom as much as possible. Further, it is possible to avoid the inconvenience that the central portion of the bottom portion has to be raised for the structural reason, even if the container is formed by the blow molding or the like. Therefore, molding such as the blow molding can be employed, and it is possible to achieve excellent productivity and manufacture the container at low cost. Further, it is possible to sufficiently achieve the seal at the peripheral edge of the raised bottom.
The wall surface for pressure-contacting constitutes the undersurface of the annular slanting wall provided at the lower portion of the body portion and slanting downward toward the outside, and the body portion has, below the annular slanting wall, a large-diameter portion having a large diameter; the outer-side wall portion has the same cylindrical shape as that of the lower end of the body portion vertically provided so as to extend downward from the lower edge of the body portion; and, the corner region of the outer-side wall portion formed by the wall for forming the raised bottom and the outer-side wall portion is brought into pressure contact with the wall surface for pressure-contacting by inverting the outer-side wall portion upward. In this case, the wall surface for pressure-contacting has a wider width in the vertical direction. Therefore, even if there exists dimension errors, molding errors and the like at the outer-side wall portion, it is possible to bring the corner region of the outer-side wall portion into pressure contact with the wall for pressure-contacting in a more reliable manner. Further, the lower portion has the large-diameter body portion, and hence, the stability further increases at the time of standing the container A.
The wall surface for pressure-contacting constitutes the undersurface of the recessed wall portion provided at the lower portion of the body portion and recessed toward the inside; the outer-side wall portion has the same cylindrical shape as that of the lower end of the body portion vertically provided so as to extend downward from the lower edge of the body portion; and, the corner region of the outer-side wall portion formed by the wall for forming the raised bottom and the outer-side wall portion is brought into pressure contact with the wall surface for pressure-contacting by inverting the outer-side wall portion upward. In this case, there is an advantage in that the body portion can be formed without forming the protruded portions from the upper end to the lower end.
In the case where the corner region of the outer-side wall portion formed by the outer-side wall portion and the wall for forming the raised bottom is formed in a arcuately curved surface, the seal between the wall surface for pressure-contacting and the corner region of the outer-surface wall portion further improves. As a result, it is possible to reliably prevent the inconvenience such as entry of the liquid into the space between the outer-side wall portion and the opposing body portion.
The wall surface for pressure-contacting constitutes an undersurface of a skirt wall sloping downward toward the outside from the lower end of the body portion; the outer-side wall portion is formed in an inverted-skirt shape so as to slope downward toward the inside as opposed to the skirt wall and extend from the lower edge of the skirt wall; and, the outer-side wall portion is brought into pressure contact with the wall surface for pressure-contacting by inverting the outer-side wall portion upward. In this case, the lower end of the body portion has a large diameter, and hence, the stability further increases at the time of standing the container. Further, it is easy to invert the inverted-skirt-shaped outer-side wall portion.
In the case where the outer-side wall portion has a wall thickness thinner than those of the body portion and the wall for forming the raised bottom, inverting of the outer-side wall portion is easy, and it is possible to prevent the inconvenience such as deformation of the wall for forming the raised bottom at the time of inverting.
The container that stands upright from the cylindrical body portion having the bottom via the shoulder portion to the mouth and neck portion, and sucks the liquid in the container by the sucking pipe of the discharging device attached to the mouth and neck portion to discharge the liquid from the nozzle portion of the discharging device is characterized in that: the body portion has a cylindrical or elliptically cylindrical shape; the outer-side wall portion having the same cylindrical shape as the body portion is provided so as to extend downward from the lower edge of the body portion; the wall for forming the raised bottom formed in a tapered shape that at least the peripheral edge portion thereof slopes inward is provided so as to extend from the lower edge of the outer-side wall portion; the outer-side wall portion is formed so as to be able to be inverted upward with the lower edge of the body portion being a center; the outer-side wall portion is inverted upward by pushing up the wall for forming the raised bottom; the outer surface of the outer-side wall portion is brought into contact with the lower end of the inner surface of the body portion; and the wall for forming the raised bottom is elevated to form the raised bottom. In this case, it is possible to prevent the liquid from remaining on the raised bottom as much as possible, and to avoid the inconvenience that the central portion of the bottom portion has to be raised for the structural reason, even if the container is formed by the blowing molding and the like. Therefore, molding such as the blow molding can be employed, and it is possible to achieve excellent productivity and manufacture the container at low cost.
In the case where the outer-side wall portion after inverted and the lower end of the body portion are fixed by melting, it is possible to gain the advantage of further reliably achieving the seal at the peripheral edge of the raised bottom.
In the case where the raised bottom is sloped and the opening at the lower end of the sucking pipe is placed at the lowest position of the raised bottom, it is possible to prevent the liquid from remaining on the raised bottom as much as possible and to avoid the inconvenience that the central portion of the bottom portion has to be raised for the structural reason, even if the container is formed by the blow molding or the like. Therefore, molding such as the blow molding can be employed, and it is possible to achieve excellent productivity and manufacture the container at low cost.
In the case where the outer-side wall portion has a wall thickness thinner than the slanting wall portion and the body portion have, it is possible to gain the advantage of easily inverting the outer-side wall portion.
The discharging device having a sucking pipe formed in a bent shape, and fixed and attached by screwing the base cap around the outer periphery of the mount and neck portion is provided, between the mouth and neck portion and the base cap, with the positioning means for positioning, at the lowest position of the raised bottom, the opening provided at the lower end of the bent sucking pipe. In this case, the opening at the lower end of the sucking pipe can be reliably and easily placed at the lowest position of the raised bottom.
The wall for forming the raised bottom formed in a tapered shape that at least the peripheral edge portion slopes toward the inside is provided so as to extend from the lower edge of the outer-side wall portion; the outer-side wall portion is inverted upward to bring the outer surface of the outer-side wall portion into contact with the inner surface of the lower end of the body portion to form the raised bottom; and, the wall for forming the raised bottom is elevated to form the raised bottom. This makes it possible to prevent the liquid from remaining on the raised bottom as much as possible and to avoid the inconvenience that the central portion of the bottom portion has to be raised for the structural reason, even if the container is formed by the blow molding or the like. Therefore, molding such as the blow molding can be employed, and it is possible to achieve excellent productivity and manufacture the container at low cost. Further, in a ease where the body portion has the polygon-cylinder-like shape, it is possible to gain an advantage that the container is easily held, and is less slippery when used in wet condition.
In the case where each corner region of the outer-side wall portion has a wall thickness thinner than the other portions thereof have, the outer-side wall portion can be extremely easily inverted. Further, even if the thickness of the outer-side wall portion itself is relatively thick, the outer-side wall portion can be easily inverted. Consequently, in the state where the corner region is brought into contact with the inner surface of the lower end portion of the body portion, the container obtains the sufficient strength as well as the high durability capable of withstanding the hydraulic pressure.
In the case where each corner region of the outer-side wall portion is formed in an arcuately curved shape, it is possible to easily perform the elastic deformation of said portion, and the outer-side wall portion can be further easily inverted. In particular, this effect can be further enhanced by combining with the configuration in which each corner region of the outer-side wall portion has a wall thickness thinner than the other portions thereof have.
In the case where the upper and the lower edge portions of the outer-side wall portion are connected via the thin hinge with the lower edge of the body portion and the peripheral edge of the wall for forming the raised bottom, respectively, the outer-side wall portion can be further easily inverted. Further, the boundary line becomes clear after the outer-side wall portion is inverted, it is possible to bring the peripheral edge of the raised bottom and the inner surface of the body portion into further closely contact with each other.
Hereinbelow, embodiments according to the present invention will be described in detail with reference to the drawings.
In
Reference number 2 represents a cylindrical body portion standing from an outer periphery of the bottom wall 1, for forming a filling space of the content inside M thereof. The body portion 2 is connected integrally with the bottom wall 1. Reference number 3 represents a mouth and neck portion provided integrally to a top portion of the body portion 2, for forming a passage connected to the filling space M. The mouth and neck portion 3 has a cylindrical shape, and an outer peripheral wall thereof is provided with a threaded portion 3a for attaching the discharging device such as a pump (it may be possible to attach the discharging device by engagement using undercut).
Reference number 4 represents a bending groove provided at a boundary between the bottom wall 1 and the body portion 2. The bending groove 4 is a groove from which the inverting and folding back of the bottom wall 1 starts, and has a cross-sectional shape protruding outward from the container after the bottom wall 1 is inverted and folded back as illustrated in
Reference number 5 represents a “narrowed portion (recessed portion)” provided to the lower peripheral wall of the body portion 2. The narrowed portion 5 includes an upper peripheral wall 5a whose diameter gradually increases toward the upward direction, and a lower peripheral wall 5b connected with a lower end of the upper peripheral wall 5a and whose diameter gradually increases toward the downward direction. Further, the narrowed portion 5 is formed around the entire circumference of the body portion 2, and is formed in a “boomerang” shape in its cross section in a shape that protrudes toward the inner direction of the body portion 2.
Reference number 6 represents an annular rib provided at almost the middle portion of the bottom wall 1 in the radial direction and protruding inwardly (toward the inside of the body portion). The annular rib 6 sections the bottom wall 1 into an inner-side wall portion 1a2 and an outer-side wall portion 1c, and serves as a start portion for forming the shape of the bottom wall 1 at the time of inverting and folding back the bottom wall 1. Further, when the bottom wall 1 is inverted and folded back, the annular rib 6 is brought into contact with the inner surface of the lower peripheral wall 5b of the narrowed portion 5 to form a seal portion between them.
Reference number 7 represents a priming-type discharging device attached to the mouth and neck portion 3 of the container. The discharging device 7 includes: a cylinder 7a passing through the mouth and neck portion 3 of the container and hung and supported at an upper portion of the filling space M; a base cap 7b for supporting the cylinder 7a and fixing the cylinder 7a to the mouth and neck portion 3 of the container; a hollow piston 7c disposed in the cylinder 7a so as to be able to reciprocatingly move; a hollow stem 7d connected integrally with the upper portion of the piston 7c and having a check valve in an inner-side passage of the piston 7c; a poppet (valve) 7e disposed on the inner side of the cylinder 7a; a pressing head 7f (including an operation portion 7f1 and discharging nozzle 7f2) having a cylindrical body connected with the upper portion of the hollow stem 7d and driving the piston 7c through the hollow stem 7d; a spring 7g disposed in the cylinder 7a and upwardly pressing (resiliently supporting) the pressing head 7f together with the piston 7c and the hollow stem 7d; and, a valve body (three-port valve and the like) 7h disposed at a sucking port 7a1 at the lower end of the cylinder 7a, and releasing the content only at the time of sucking. Further, a base portion 7a2 is fitted to the upper end portion of the cylinder, and the pressing head is screwed to the base portion.
Further, reference number 8 represents a sucking pipe connected with the sucking port 7a1 of the cylinder 7a. The sucking pipe 8 has a straight shape, and the lower end thereof is located at the liquid pool 1a1 provided at the center region of the bottom wall 1. A gap is formed between the bottom wall 1 and the lower end of the sucking pipe 8 so as to reliably suck the content.
The synthetic resin container according to the present invention has a shape as illustrated in
The annular hollow portion 10 is provided so as to correspond to a ground-contacting portion located at the lowest end of the self-standing foot portion 9, improving a cushioning property of the container and contributing to improvement in buckling strength.
The bending groove 4 may be formed in a U-shape or a square U-shape in its cross section. Although description has been made of an example of the shape of the bending groove 4 in which the annular hollow portion 10 having a circular cross section is formed when the bottom wall 1 is inverted and folded back, the shape of the bending groove 4 is not particularly limited.
As illustrated in
In particular, at the time of forming the container with a thin wall, there is a concern that the shape of the bottom wall 1 deforms due to the weight of the content, and a space is formed between the lower peripheral wall of the body portion 2 (lower peripheral wall 5b of the narrowed portion 5) and the outer-side wall portion 1c of the bottom wall 1. However, by forming the seal portion by the annular rib 6, it is possible to achieve the reliable seal. Although it has been described that the annular rib 6 has a U-shape in its cross section, it may be possible to change the shape of the annular rib 6, provided that the seal portion is reliably form.
To discharge the content in the container by the discharging device 7, the connection between the operation portion 7f1 of the pressing head 7f and the base portion 7a2 is release (
After the pressing head 7f is pushed upward by the spring 7g, the piston 7c and the hollow stem 7d are also pushed upward together with the pressing head 7f, which makes the inner side of the cylinder 7a negative pressure. This causes the content in the filling space M to be sucked through the sucking pipe 8 into the cylinder 7a.
In this state, by pressing the pressing head 7f, the inner side of the cylinder 7a is pressurized and compressed; at the time when the pressure in the cylinder reaches a predetermined pressure, the pressurized and compressed content passes through a space formed between the piston 7c and the poppet 7e and the inner passage in the hollow stem 7d, and is discharged toward the external space from the nozzle portion 7f2 of the pressing head 7f. By repeating the pressing of the pressing head 7f and the recovery by the spring 7g several times, it is possible to continuously discharge the content.
The synthetic resin container according to the present invention has the liquid pool 1a1 at the center region of the bottom wall 1, and hence, the content flows toward the center region of the bottom wall 1 regardless of the filling amount of the content. Therefore, it is possible to discharge almost all of the content in the container by the discharging device 7, achieving excellent usability.
In the description above, the discharging device attached to the present invention employs the pressing head that moves vertically. However, it may be possible to employ a trigger-type discharging device and the like, and the type of the discharging device is not particularly limited.
It is preferable that, before the inverting and folding back, angles (inclination angles) of the lower peripheral wall of a body portion 2 (corresponding to a lower peripheral wall 5b of a narrowed portion 5) and a outer-side wall portion 1c of the bottom wall 1 with respect to a horizontal plane are set in an angle that forms a gentle angle. This makes it easy to invert and fold back the bottom wall 1. Further, by setting an angle of the lower peripheral wall 5b of the narrowed portion 5 with respect to the horizontal plane at an equal angle, in inverted orientation, to an angle of the outer-side wall portion 1c of the bottom wall 1 with respect to the horizontal plane, the lower peripheral wall 5b of the narrowed portion 5 can be reliably brought into close contact with the outer-side wall portion 1c of the bottom wall 1 after the inverting and folding back.
Next, with reference to
First, as illustrated in
As illustrated in
The wall for forming the raised bottom integrally extends from the lower edge of the outer-side wall portion 1c so as to close the lower end opening of the outer-side wall portion 1c. At the central portion, there is provided the liquid pool 1a1 having the circular shape similar to the peripheral edge portion and having a recessed shape; the circumference of the liquid pool 1a1 is formed at the inner-side wall portion 1a2 descending inward; and, the inner-side wall portion lag is connected with the lower edge of the outer-side wall portion 1c so is as to close the lower end opening of the outer-side wall portion 1c. When the outer-side wall portion 1c is inverted, the liquid pool 1a1 and the inner-side wall portion 1a2 are elevated, and the wall for forming the raised bottom becomes the raised bottom 1a.
From the state illustrated in
The discharging device 7 is fixed to the container body A by a base cap 7b fitted to the outer periphery of a mouth and neck portion 3; a flange of a cylinder 7a attached on the mouth and neck portion 3 by way of a gasket p is fixed by a flange-like top plate of a base cap 7b; the lower portion of the cylinder 7a is installed vertically in the upper portion of the container body A; and, a pressing head 7f is fitted to the upper end of a stem (not shown) protruding at a position higher than the cylinder 7a in an energized state so as to be able to be pushed. Further, the lower end of a sucking pipe 8, upper end of which is fitted to the lower end portion of the cylinder 7a, is installed vertically in a manner that an opening portion at the lower end of the sucking pipe 8 is disposed in the vicinity of the upper surface of the liquid pool 1a1. Note that
In the pump container P having the configuration described above, the screwed state of the pressing head 7f is released from the state illustrated in
In this case, as illustrated in the long dashed double-dotted line in
In this case, as illustrated in the long dashed double-dotted line in
In this case, as illustrated in the long dashed double-dotted line in
Next, still another embodiment according to the present invention will be specifically described with reference to
As illustrated in
As illustrated in
The slanting wall portion 1b is formed in a slanting-plate shape, extending integrally from the lower end edge of the outer-side wall portion 1c, and closing the lower end opening portion of the outer-side wall portion 1c. When the outer-side wall portion 1c is inverted, the slanting wall portion 1b is inverted symmetrically with respect to a plane passing through the lower end edge of the body portion 2 to form the slanting wall portion 1b into a raised-bottom shape.
By pushing the rear portion of the slanting wall portion 1b upward from the state illustrated in
The discharging device 7 includes: a flange 7d1 extending at the upper portion of the outer periphery thereof; a cylinder 7a having an annular seal tube 7d2 vertically extending from the peripheral edge portion of the undersurface of the flange 7d1; and, a base cap 7d fitted and fixed on the outer periphery portion of the flange 7d1. The base cap 7b has a flange-like top plate 7b1 extending inward from the upper end thereof, and the flange-like top plate 7b1 is fitted and fixed to the flange 7d1 by an engagement means so as not to be movable. The pressing head 7f is fitted to the upper end of a stem protruding at a position higher than the cylinder 7a in an energized state so as to be able to be pushed. A sucking pipe 8, upper end of which is fitted to the lower end portion of the cylinder 7a, is installed vertically. The sucking pipe 8 is formed in a bent shape such that the middle portion thereof is bent. Note that, as illustrated in the enlarged view of
Between a mouth and neck portion 3 and the base cap 7b, there is provided a positioning means for positioning, at the lowest position of the raised-like slanting wall portion 1b, an opening provided at the lower end of the bent sucking pipe 8 at the time of screwing the base cap 7b to the mouth and neck portion 3. The positioning means is formed by a part of a large number of vertical protrusions 3b provided at the lower end portion of the outer surface of the mouth and neck portion 3 at equal intervals in the circumferential direction, and a pair of engagement protrusions 7b3 protruding at an opposing position of the lower end portion of the inner surface of the base cap 7b. Note that the vertical protrusions 3b constituting the positioning means are merely a part of the large number of the vertical protrusions. Therefore, it is not necessary to provide a large number of vertical protrusions 3b in the circumferential direction as described above, and it may be possible to set the vertical protrusions by the number corresponding to the number of the engagement protrusions.
At the time of attaching the discharging device 7 to the container body A, the base cap 7b is screwed to the outer surface of the mouth and neck portion 3 of the container while the cylinder 7a and the sucking pipe 8 are being installed vertically in the container body A, and the seal tube 7d2 is tightly fitted on the inner surface of the mouth and neck portion 3. A liquid sealing property at this portion is achieved by the seal tube 7d2. Further, when the screwing of the base cap 7b is completed, the engagement protrusions 7b3 on the inner surface of the base cap 7b are engaged between predetermined vertical protrusions 3b on the outer surface of the mouth and neck portion 3, and at this time, the opening at the top end of the sucking pipe 8 is placed at the lowest position of the raised-like slanting wall portion 1b as illustrated in
In the pump container having the configuration described above, the screwed state of the pressing head 7f is released from the state illustrated in
Next, still another embodiment according to the present invention will be specifically described with reference to
As illustrated in
As illustrated in
The wall for forming the raised bottom extends integrally from the lower edge of the outer-side wall portion 1c and closes the opening portion at the lower end of the outer-side wall portion 1c. At the central portion, there is provided a liquid pool 1a1 having a rectangular shape similar to the peripheral edge portion. Around the liquid pool 1ab there is provided an inner-side wall portion 1a2 sloping down toward the inside. The inner-side wall portion 1a2 connects with the lower edge of the outer-side wall portion 1c, and closes the opening portion at the lower end of the outer-side wall portion 1c. When the outer-side wall portion 1c is inverted, the wall for forming the raised bottom is elevated to similarly form a raised bottom 1a having the liquid pool 1a1 and the inner-side wall portion 1a2.
By pushing the wall for forming the raised bottom upward with respect to the body portion 2 from the state illustrated in
A discharging device 7 is fixed to a container body A by a base cap 7b fitted to the outer periphery of a mouth and neck portion 3; a cylinder 7a whose upper end portion is fixed to the base cap 7b is installed vertically in the upper portion of the container body A; and, a pressing head 7f is fitted to the upper end of a hollow stem 7d protruding at a position higher than the cylinder 7a in an energized state so as to be able to be pushed. Further, the lower end of a sucking pipe 8, upper end of which is fitted to the lower end portion of the cylinder 7a, is installed vertically in a manner that an opening portion at the lower end of the sucking pipe 8 is disposed in the vicinity of the upper surface of the liquid pool 1a1. Note that C in the drawing represents a stopper for preventing the pressing head 7f from being unintentionally depressed.
In the pump container having the configuration described above, the stopper C is removed from the state illustrated in
It should be noted that the present invention is not limited to the embodiments described above, and it is possible to achieve the same effects as those described above even if constituting elements are mutually exchanged between the embodiments.
It is possible to provide a synthetic resin container including an inverting and folding back bottom wall and having an excellent usability capable of securing a stable self-standing position with high rigidity (especially buckling strength); completely discharging contents without accompanying complicated operations; being formed by a blow molding and the like; and maintaining the existing favorable productivity and low cost.
1 Bottom wall
1a Raised bottom
1a1 Liquid pool
1a2 Inner-side wall portion
1b Slanting wall portion
1c Outer-side wall portion
2 Body portion
3 Mouth and neck portion
3a Threaded portion
4 Bending groove
5 Narrowed portion
5a Upper peripheral wall
5b Lower peripheral wall
6 Annular rib
7 Discharging device
7a Cylinder
7b Base cap
7c Piston
7d Hollow stem
7e Poppet
7f Pressing head
7g Spring
7h Valve body
8 Sucking pipe
9 Self-standing foot
10 Annular hollow portion
11 Rib
M Filling space
Suzuki, Kazuo, Hayakawa, Shigeru, Kitamura, Yoshiharu
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Dec 24 2009 | YOSHINO KOGYOSHO CO., LTD. | (assignment on the face of the patent) | / |
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