Sand blasting apparatus

Abstract

An abrasive cleaning apparatus configured for use in combination with a mobile chassis comprising a base means including attachment means to fasten the abrasive cleaning apparatus to the mobile chassis, an adjustable nozzle support means to operatively support a plurality of nozzle means thereon and interconnecting boom means coupled between the base means and adjustable nozzle support means. The interconnecting boom means includes a first and second boom element arranged in telescoping relation relative to each other to permit linear adjustment of the adjustable nozzle support means relative to the base means and mobile chassis. The adjustable nozzle support means includes a first and second positioning means to permit movement of the plurality of nozzle means in a first and second plane respectively.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

An abrasive cleaning apparatus including an adjustable nozzle support means having a first and second positioning means to permit movement of a plurality of nozzle means in a first and second plane respectively.

2. Description of the Prior Art

Sand blasting of surfaces cleaned preparatory to painting and simply cleaning in the case of stone or brick walls is a common practice. Generally, this is accomplished by an operator positioned on a scaffold or other suitable support manually manipulates at least one discharge nozzle. Obviously, the presence of the operator in the work zone makes this an extremely dirty and hazardous occupation. Moreover, the limited volume of sand blasted against the surface by a single nozzle is very inefficient.

As a result, abrasive blast apparatus, particularly used for large surface areas, may employ multiple rather than a single blast nozzle. The obvious advantage of this being a greatly increased blast pattern. Due to the increased weight and speed of operation, these nozzles are often mounted on movable carriages or platforms on which the operator rides. The platform is movable laterally and vertically along the area to be cleaned which results in significant labor saving devices.

Unfortunately, a number of difficulties have been experienced which hindered general acceptance and wide use for the multi-nozzle head. For example, many multi-nozzle heads are of a type in which the sand and air are delivered and mixed in a common reservoir from which jet streams are propelled simultaneously from the nozzles all of which communicate directly with the reservoir. In another configuration, the operator may be provided with two separate nozzles each having its own supply lines. In either of these arrangements, individual control of the nozzles is lacking to the extent that the blast stream from one nozzle cannot be cut off independently of the other. Such independent manipulations of the blast from the different nozzles is desirable in situations involving spots or areas which present difficult cleaning problems. The blast from one nozzle must work on this different area for a prolonged period, during which time and other blasts will be cutting away injuriously at the clean metal or surrounding areas.

Another difficulty with previous multi-blast carriage arrangements is that the units are very cumbersome and complex so as to be suitable only for special cleaning operations. Also many such ly moved linearally relative to the first interconnecting boom element 24 in the direction as shown by arrow b--b. This telescoping arrangement comprises a second adjustment means permitting adjustment of the adjustable nozzle support means 16 relative to the operating cage 22 and the base plate 18 as shown by arrow b--b.

The adjustable nozzle support means 16 comprises a first and second positioning means 38 and 40 respectively to permit movement of the plurality of nozzle means generally indicated as 42 in a first and second plane respectively as shown by arrows c--c and d--d respectively. The first positioning means 38 comprises a first and second member 44 and 46 respectively held fixed spaced relationship by end members 49 and with mounting frame 60 pivoted at 50. The first positioning means 38 further includes boom attachment means 52 comprising plate 48, tubular element 56 and securing means 58. The entire adjustable nozzle support means 16 is pivotably mounted on second interconnecting element 38 by tubular element 56 extending through element 28 and secured thereto by securing means 58 which may comprise a cotter key or nut. The second positioning means 40 comprises a the mounting frame 60 and handle 62 as best shown in FIGS. 1 and 2. The mounting frame 60 is pivotally mounted on the outer end member at 50 to support the plurality of nozzle means 42 members 44 and 46. The mounting frame 60 includes a plurality of apertures 64 formed therein to receive a corresponding plurality of nozzles 66.

In operation, the operator stands on the platform 22 adjacent the adjustable nozzle support means 16. As can be readily understood the plurality of nozzles means 42 is coupled to a remote supply source through a conduit means 68. For example, the remote supply source may comprise a sand hopper which also incorporates an appropriate compressed air supply for forcefully transporting and driveing the abrasive from the nozzles. In a manner which will be understood, a supply of compressed air is directed along with the sand into flexible sand conduits for transporting the sand through these conduits 68. In addition, compressed air may also be directed into flexible air conduits. This separate supply of air under pressure eventually being is directed into a mixing reservoir within the blast nozzles 66 to and against the work. The manner in which the air and sand is mixed in the nozzle is of no particular concern. The nozzle structure 66 of the present mechanism itself can be on any appropriate conventional configuration.

To adjust the abrasive cleaning apparatus 10, the interconnecting boom means 14 is rotated relative to the base plate 18 to the desired position. The second boom element 26 is then adjusted in telescoping relation relative to the first boom element 24 to the desired position. Once the abrasive cleaning apparatus 10 has been adjusted relative to the work surface, the operator is ready to clean the work surface with the blasting device supplying the blasting medium under pressure.

The operator then cleans the work surface, manipulating the adjustable nozzle support means 16 by pivoting the first and second positioning means 38 and 40 respectively in the first and second planes relative to the work surface and base plate. In this manner, the operator is able to clean an enlarged work surface through the use of multiple nozzles without the necessity of supporting the nozzles or air and abrasive supply conduits. The mobile chassis is then moved to an adjacent work surface until the entire area is cleaned.

In this manner, an efficient, reliable and blasting apparatus is provided.

It will thus be seen that the objects set forth above, among those made apparent from the preceding description, are efficiently attained, and, since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention, which, as a matter of language, might be said to fall therebetween.

Claims

1. An abrasive cleaning apparatus configured for use in combination with fluid medium pressure source, said abrasive cleaning apparatus comprising a base means for mounting said abrasive cleaning apparatus on a platform, an adjustable nozzle support means interconnected to said base means by interconnecting boom means, said adjustable nozzle support means including a first positioning means to pivotally adjust said adjustable nozzle support means in a first plane relative to said base means and a second positioning means coupled to said first positioning means to pivotally adjust said adjustable nozzle support means in a second plane relative to said base means, said first positioning means comprising a first and second element held in fixed relationship relative to one another by a pair of end members disposed at opposite ends thereof, said first positioning means being pivotally attached to the outer portion of said interconnecting boom means, said second positioning means comprises a frame including a plurality of apertures formed therein to receive a corresponding plurality of nozzles to fix said nozzles in fixed spaced relationship relative to one another, said second positioning means being coupled at substantially the mid-point thereof to the outer end member of said first positioning means to permit pivotal movement relative to one another, said second positioning means further includes a handle means fixedly attached thereto such that the weight of said nozzles is supported by said interconnecting boom means to permit movement of said adjustable nozzle support means in said first and second planes.

2. The abrasive cleansing apparatus in claim 1 wherein said interconnecting boom means and said base means cooperatively form the first adjustment means to rotatably adjust said adjustable support means relative to said base means in the plane of said base means.

3. An abrasive cleaning apparatus of claim 2 wherein said base means comprises a base plate having a plurality of apertures formed therein and said interconnecting boom means comprises a first boom element including an engaging means, said engaging means disposed to selectively engage one of said plurality of said apertures to selectively position said first boom element relative to said base plate.

4. The abrasive cleaning apparatus of claim 1 wherein said interconnecting boom means comprises a first and second boom element, said first and second boom element arranged in telescopic relationship relative to one another to comprise a second adjustment means to permit linear adjustment of said adjustable nozzle support means relative to said base means.

5. The abrasive cleaning apparatus of claim 4 wherein said interconnecting boom means further includes a coupling means to selectively fix the position of said second boom element relative to said first boom element.

6. The abrasive cleaning apparatus of claim 1 wherein said first plane is substantially perpendicular to the plane of said base means and said second plane is perpendicular to both said first plane and the plane of said base means.

7. An abrasive cleaning apparatus configured for use in combination with a fluid medium pressure source, comprising in combination:

a base means;

a mobile chassis receiving said base means for mobile operation;

a plurality of nozzles;

a plurality of conduits connecting said plurality of nozzles to the fluid medium pressure source;

means for securing said plurality of nozzles in fixed relationship relative to one another;

said means for securing said plurality of nozzles including a nozzle support securing said plurality of nozzles in a fixed substantially parallel relation;

an interconnecting boom means comprising a first and a second boom element for interconnecting said base means and said plurality of nozzles;

first adjustment means for pivotably adjusting said first boom element relative to said base means;

second adjustment means comprising said first and second boom elements arranged in telescopic relationship relative to one another to permit linear adjustment of said plurality of nozzles relative to said base means;

first and second positioning means for pivotably adjusting said plurality of nozzles relative to a terminal end of said second boom element;

said first and second positioning means each including only a single pivot for pivotably mounting said plurality of nozzles to said second boom element of said interconnecting boom means; and

said first and second positioning means respectively pivotably mounting said plurality of nozzles in first and second mutually perpendicular planes for enabling said plurality of nozzles to pivot said plurality of nozzles in two mutually perpendicular directions at said terminal end of said interconnecting boom means.

8. An apparatus as set forth in claim 7, wherein one of said first and second planes is substantially parallel to the plane of movement of said interconnecting boom means about said first adjustment means.

9. An apparatus as set forth in claim 7, wherein said base means comprises a base plate having a plurality of apertures formed therein and said interconnecting boom means comprises a first boom element including an engaging means, said engaging means disposed to selectively engage one of said plurality of said apertures to selectively position said first boom element relative to said base plate.

10. An apparatus as set forth in claim 7, wherein said interconnecting boom means further includes a coupling means to selectively fix the position of said second boom element relative to said first boom element.

11. An abrasive cleaning apparatus configured for use in combination with a fluid medium pressure source, comprising in combination:

a base means;

a mobile chassis receiving said base means for mobile operation;

a plurality of nozzles;

a plurality of conduits connecting said plurality of nozzles to the fluid medium pressure source;

a nozzle support means for securing said plurality of nozzles in fixed, substantially parallel relationship relative to one another;

an interconnecting boom means comprising a first and a second boom element for interconnecting said base means and said plurality of nozzles;

first adjustment means for pivotably adjusting said first boom element relative to said base means;

second adjustment means comprising said first and second boom elements arranged in telescopic relationship relative to one another to permit linear adjustment of said plurality of nozzles relative to said base means;

first and second positioning means for pivotably adjusting said nozzle support means containing said plurality of nozzles relative to a terminal end of said second boom element;

each of said first and second positioning means consisting of only a single pivot for mounting said plurality of nozzles fixed in said nozzle support means; and

said first and second positioning means respectively pivotably mounting said nozzle support means about first and second mutually perpendicular axes for enabling said plurality of nozzles to pivot said plurality of nozzles in two mutually pependicular directions at said terminal end of said interconnecting boom means.