A ceiling panel that conceals the grid in a suspended ceiling, having opposed active first and second edges with profiles different from one another, and opposed passive edges. An access kerf, and a registration kerf, at different levels in the active edges, along with a registration step in one active edge, permit the panel to be inserted, or removed, by successive hinge actions. When installed, the panel is locked to the ceiling with no visual indications on how the panel can be removed. During installation the panel is self-centering and self-aligning.
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19. In a ceiling panel capable of being assembled into place in an opening in a ceiling grid to form, with the grid, a horizontal suspended ceiling and, the panel having first (A) and second (B) opposing active edges, each of such said first and second active edges having an upper and a lower lip, wherein, when the panel is in place horizontally in an the opening, the grid is at least partially concealed when viewed from below;
the improvement comprising an access kerf (33) in the first edge (A) at a lower level from a level of a registration kerf (35) in the second edge (B), and a registration step (36) in the first edge (A) at a level above the level of the access kerf (33);
whereby, when the panel is being assembled into place in the opening, the access kerf (33) provides the registration kerf (35) with access to the grid, to, in combination with the registration step (36) in the first edge (A), fit the panel correctly in the opening; and
wherein the registration kerf has a substantially horizontal lower surface and the access kerf has a substantially horizontal upper surface, the substantially horizontal lower surface being at a level above a level or the substantially horizontal upper surface.
0. 20. A panel for use in a suspended ceiling having a panel supporting grid formed of inverted t-section beams, the panel, when extending horizontally, having:
a) opposing first and second edges that are active in installing and removing the panel into and from the grid, each of which has a profile different from the other;
b) opposing third and fourth edges, each of which has a profile;
c) an access kerf in the profile of the first edge that extends along the first edge at a first level;
d) a registration kerf in the profile of the second edge that extends along the second edge;
e) a tread in the registration kerf of the second edge that extends along the second edge above the first level of the access kerf in the profile of the first edge;
f) a registration step having a riser and a tread in the profile of the first edge that extends along the first edge above the first level of the access kerf in the first edge, the tread being approximately at the same level as the tread in the second edge;
g) an upper lip on the first edge having an underside formed by the tread of the registration step, and an upper lip on the second edge having an underside formed by the tread of the second edge, each of said undersides of said upper lips being at approximately the same level when the panel extends in the plane of the grid, that support the panel in the ceiling; and
h) the registration kerf having a substantially horizontal lower surface.
15. In a horizontal suspended ceiling having:
a grid of inverted t-sections having flanges; and
panels supported by the grid flanges; means for locking a panel to the grid flanges comprising opposed parallel first and second edges (A and B) that are active in installing and removing the panel from the grid, having
a) in the first edge (A), an access kerf (33) extending horizontally along the first edge (A);
b) in the first edge (A), a registration step (36) extending horizontally along the first edge (A) above the access kerf (33);
c) in the second edge (B), a registration kerf (35) extending horizontally along the second edge (B), at a level above the access kerf (33) in the first edge (A);
d) an upper lip above and a lower lip below the access kerf (33) and the registration step (36) in the first edge (A), and an upper lip above and a lower lip below the registration kerf (35) in the second edge (B); and
e) means for positioning the upper lips above the grid flange, and the lower lips below the grid flange on the first and second edges (A and B) having
e.1) first hinge means formed of the access kerf (33) in the first edge (A) and its adjacent flange side for first rotating the panel into a first position;
e.2) means that permit translation of the panel to disengage the first hinge means and engage second hinge means formed of the registration kerf (35) in the second edge (B) and its adjacent flange whereby the panel can be rotated in a direction counter to the first rotation; and
e.3) means formed by the registration step (36) in the first edge (A) and the registration kerf (35) in the second edge (B) to position the first and second edges (A and B) with respect to the flange side adjacent each of the first and second edges (A and B).
16. For use in a suspended ceiling that has a panel supporting grid formed of inverted t-section beams, a panel, when extending horizontally, having:
a) opposing first and second edges (A and B), each of which has a profile different from the other;
b) at least two opposing third and fourth edges (C and D) that are passive in installing and removing the panel from the grid;
c) a substantially horizontal access kerf (33) in the profile of the first edge (A) that extends along the first edge (A) at a first level;
d) a substantially horizontal registration kerf (35) having an upper side in the profile of the second edge (B) that extends at a second level along the second edge above the first level of the access kerf (33) in the profile of the first edge (A);
e) a registration step (36) having a riser and a tread in the profile of the first edge (A) that extends along the first edge (A) above the first level of the access kerf in the first edge (A), the tread being at approximately the same level as the upper side of the registration kerf in the second edge (B);
f) a lower lips lip on at least each of the first and second edges (A and B) of the panel for concealing a portion of a the grid when installed;
g) a substantially vertical wall on the passive third and fourth edges (C and D) of the panel; and
h) an upper lip on the first edge (A) having an under side underside formed by the tread of the registration step, and an upper lip on the second edge having an underside (B) formed by the upper side of the registration kerf in the second edge (B), such each of said upper lips formed by the underside having a lower surface at approximately the same level when the panel extends in a horizontal plane, that support the panel in the ceiling; and
i) wherein the registration kerf has a substantially horizontal lower surface and the access kerf has a substantially horizontal upper surface.
0. 31. A panel for use in a panel supporting grid formed of inverted t-section beams, the panel, when extending horizontally, having:
a) opposing first and second edges that are active in installing and removing the panel into and from the grid, each of which has a profile different from the other;
b) opposing third and fourth edges, each of which has a profile;
c) an access kerf in the profile of the first edge that extends along the first edge at a first level;
d) a registration kerf in the profile of the second edge that extends along the second edge;
e) a tread in the registration kerf of the second edge that extends along the second edge above the first level of the access kerf in the profile of the first edge;
f) a registration step having a riser and a tread in the profile of the first edge that extends along the first edge above the first level of the access kerf in the first edge, the tread being approximately at the same level as the tread in the second edge;
g) an upper lip on the first edge having an underside formed by the tread of the registration step, and an upper lip on the second edge having an underside formed by the tread of the second edge, each of said undersides of said upper lips being at approximately the same level when the panel extends in the plane of the grid, that support the panel in the ceiling;
h) a lower lip on each of the first and second edges, the lower lip of the first edge located at a level below the first level of the access kerf and the lower lip of the second edge located at a level below a level of the registration kerf, the lower lips of the second and third edges at least partially concealing the grid when the panel is installed in the grid; and
i) the upper lip of the second edge having an end surface that is inwardly offset from an end surface of the lower lip of the second edge.
0. 36. A suspended ceiling comprising:
a panel supporting grid formed of inverted t-section beams having flanges;
a plurality of panels supported by the flanges, each of the panels comprising, when extending horizontally in the grid:
a) opposing first and second edges that are active in installing and removing the panel into and from the grid, each of which has a profile different from the other;
b) opposing third and fourth edges, each of which has a profile;
c) an access kerf in the profile of the first edge that extends along the first edge at a first level;
d) a registration kerf in the profile of the second edge that extends along the second edge;
e) a tread in the registration kerf of the second edge that extends along the second edge above the first level of the access kerf in the profile of the first edge;
f) a registration step having a riser and a tread in the profile of the first edge that extends along the first edge above the first level of the access kerf in the first edge, the tread being approximately at the same level as the tread in the second edge;
g) an upper lip on the first edge having an underside formed by the tread of the registration step, and an upper lip on the second edge having an underside formed by the tread of the second edge, each of said undersides of said upper lips being at approximately the same level when the panel extends in the plane of the grid, that support the panel in the ceiling; and
h) a lower lip on each of the first and second edges, the lower lip of the first edge located at a level below the first level of the access kerf and the lower lip of the second edge located at a level below a level of the registration kerf;
wherein the lower lips of the second edges of the plurality of the panels abut the lower lips of the first edges of adjacent ones of the plurality of the panels.
1. For use in a suspended ceiling that has a panel supporting grid formed of inverted t-section beams, a panel, when extending horizontally, having:
a) opposing first and second edges (A and B,) that are active in installing and removing the panel into and from the grid, each of which has a profile different from the other;
b) opposing third and fourth edges (C and D), each of which has a profile;
c) an access kerf (33) in the profile of the first edge (A) that extends along the first edge (A) at a first level;
d) a registration kerf (35) in the profile of the second edge (B) that extends along the second edge (B);
e) a tread (30) in the registration kerf (35) of the second edge (B) that extends along the second edge (B) above the first level of the access kerf (33) in the profile of the first edge (A);
f) a registration step having a riser (34) and a tread (39) in the profile of the first edge (A) that extends along the first edge (A) above the first level of the access kerf (33) in the first edge (A), the tread (39) being approximately at the same level as the tread (30) in the second edge (B); and
g) an upper lip (42) on the first edge (A) having an underside formed by the tread (39) of the registration step, and an upper lip (43) on the second edge (B) having an underside formed by the tread (30) of the second edge B, each of said undersides of said upper lips (42, 43) being at approximately the same level when the panel extends in the plane of the grid, that support the panel in the ceiling;
h) wherein none of the first, second, third or fourth edges can be identified as the first edge, the second edge, the third edge, or the fourth edge by visual inspection of the ceiling from below; and
i) wherein the first and second edges can be determined when the panel is installed in the ceiling by an upward force on the center of the panel, whereby the panel will pivot upward about the registration kerf in the second edge.
3. The panel of
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0. 11. The panel of
0. 12. A panel of
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0. 17. In a group of component parts first capable of being assembled in the field into a horizontal suspended ceiling, and then capable of being disassembled; the group having a ceiling grid of intersecting beams of inverted t cross section forming grid openings, and panels, each of which is adapted to fit into, and extend horizontally within, a grid opening; the improvement comprising a panel having
a) first and second opposing edges (A and B) in combination, each edge having a profile different from the other edge;
b) an upper and lower lip on each of the first and second edges (A and B);
c) a registration step in the first edge (A) having a horizontal tread formed by the upper lip;
d) an access kerf (33) in the first edge (A) at a first level below the registration step (36);
e) a registration kerf (35) in the second edge (B) formed by the upper and lower lip of the second edge (B) at a second level above the first level of the access kerf;
wherein
a) in assembling a panel into the ceiling,
a.1) the access kerf (33) in the first edge (A) permits the registration kerf (35) in the second edge (B) to engage, and form a hinge with, the grid; and then
a.2) the registration kerf in the second edge (B) permits the panel to be shifted and rotated to engage the registration step in the first edge (A) with the grid;
b) in the panel in an assembled ceiling, the registration kerf in the second edge (B) combines with the registration step in the first edge (A) to position the panel within the grid opening;
c) in disassembling the panel from the ceiling,
c.1) the registration step in the first edge (A) permits the panel to be rotated about the hinge formed by the registration kerf in the second edge (B) and the grid, and then
c.2) the access kerf in the first edge (A) permits the panel to be shifted to disengage the kerf in the second edge (B) from the grid.
0. 18. In a process, a group of component parts first capable of being assembled in the field into a horizontal suspended ceiling, and then capable of being disassembled; the group having a ceiling grid of intersecting beams of inverted t cross section forming grid openings, and panels, each of which is adapted to fit into, and extend horizontally within, a grid opening;
the improvement comprising a panel having
a) first and second opposing edges (A and B) in combination, each edge having a profile different from the other edge;
b) an upper and lower lip on each of the first and second edges (A and B);
c) a registration step in the first edge (A) having a horizontal tread formed by the upper lip;
d) an access kerf (33) in the first edge (A) at a first level below the registration step (36);
e) a registration kerf (35) in the second edge (B) formed by the upper and lower lip of the second edge (B) at a second level above the first level of the access kerf;
wherein
a) in assembling a panel into the ceiling,
a.1) the access kerf (33) in the first edge (A) permits the registration kerf (35) in the second edge (B) to engage, and form a hinge with, the grid; and then
a.2) the registration kerf (35) in the second edge (B) permits the panel to be shifted and rotated to engage the registration step in the first edge (A) with the grid;
b) in the panel in an assembled ceiling, the registration kerf (35) in the second edge (B) combines with the registration step (35) in the first edge (A) to position the panel within the grid opening;
c) in disassembling the panel from the ceiling,
c.1) the registration step (36) in the first edge (A) permits the panel to be rotated about the hinge formed by the registration kerf (35) in the second edge (B) and the grid, and then
c.2) the access kerf (33) in the first edge (A) permits the panel to be shifted to disengage the registration kerf (35) in the second edge (B) from the grid.
0. 21. The panel of claim 20 wherein the access kerf has a substantially horizontal upper surface, the substantially horizontal lower surface of the registration kerf being at a level above the substantially horizontal upper surface of the access kerf.
0. 22. The panel of claim 20 wherein the substantially horizontal lower surface of the registration kerf extends substantially parallel to the tread of the registration step.
0. 23. The panel of claim 20 wherein the substantially horizontal lower surface of the registration kerf extends substantially parallel to the tread of the second edge.
0. 24. The panel of claim 20 further comprising a lower lip on each of the first and second edges, the lower lip of the first edge located at a level below the first level of the access kerf and the lower lip of the second edge located at a level below a level of the registration kerf, the lower lips of the first and second edges at least partially concealing the grid when the panel is installed in the grid.
0. 25. The panel of claim 24 wherein the upper lip of the second edge has an end surface that is inwardly offset from an end surface of the lower lip of the second edge.
0. 26. The panel of claim 25 wherein the lower lip of the second edge comprises a cutout.
0. 27. The panel of claim 26 wherein the cutout of the lower lip of the second edge comprises a substantially vertical surface and a substantially horizontal surface.
0. 28. The panel of claim 27 wherein the substantially vertical surface of the cutout of the lower lip of the second edge is inwardly offset from the end surface of the lower lip of the second edge; and wherein the end surface of the upper lip of the second edge is inwardly offset from the substantially vertical surface of the cutout.
0. 29. The panel of claim 20 further comprising a lower lip on each of the third and fourth edges, the lower lips of the third and fourth edges at least partially concealing the grid when the panel is installed in the grid.
0. 30. The panel of claim 20 further comprising:
i) the access kerf having a substantially horizontal upper surface, the substantially horizontal lower surface of the registration kerf being at a level above the substantially horizontal upper surface of the access kerf;
j) the substantially horizontal lower surface of the registration kerf extending substantially parallel to the tread of the registration step;
k) the substantially horizontal lower surface of the registration kerf extending substantially parallel to the tread of the second edge;
l) a lower lip on each of the first and second edges, the lower lip of the first edge located at a level below the first level of the access kerf and the lower lip of the second edge located at a level below a level of the registration kerf;
m) the upper lip of the second edge having an end surface that is inwardly offset from an end surface of the lower lip of the second edge;
n) the lower lip of the second edge comprising a cutout having a substantially vertical surface and a substantially horizontal surface;
o) the substantially vertical surface of the cutout of the lower lip of the second edge being inwardly offset from the end surface of the lower lip of the second edge; and
p) the end surface of the upper lip of the second edge being inwardly offset from the substantially vertical surface of the cutout.
0. 32. The panel of claim 31 further comprising a lower lip on each of the third and fourth edges, the lower lips of the third and fourth edges at least partially concealing the grid when the panel is installed in the grid.
0. 33. The panel of claim 31 wherein the registration kerf has a substantially horizontal lower surface.
0. 34. The panel of claim 33 wherein the access kerf has a substantially horizontal upper surface, the substantially horizontal lower surface of the registration kerf being at a level above the substantially horizontal upper surface of the access kerf; and wherein the substantially horizontal lower surface of the registration kerf extends substantially parallel to the tread of the registration step.
0. 35. The panel of claim 31 wherein the lower lip of the second edge comprises a cutout; wherein the cutout of the lower lip of the second edge comprises a substantially vertical surface and a substantially horizontal surface; and wherein the substantially vertical surface of the cutout of the lower lip of the second edge is inwardly offset from the end surface of the lower lip of the second edge; and wherein the end surface of the upper lip of the second edge is inwardly offset from the substantially vertical surface of the cutout.
0. 37. The suspended ceiling of claim 36 wherein each of the plurality of panels further comprises a lower lip on each of the third and fourth edges; and wherein the lower lips of the third edges of the plurality of the panels abut the lower lips of the fourth edges of adjacent ones of the plurality of the panels.
0. 38. The suspended ceiling of claim 37 wherein the first, second, third, and fourth edges totally conceal the grid.
0. 39. The suspended ceiling of claim 36 wherein for each of the plurality of panels, the registration kerf comprises a substantially horizontal lower surface.
0. 40. The suspended ceiling of claim 39 wherein for each of the plurality of panels, the access kerf has a substantially horizontal upper surface, the substantially horizontal lower surface of the registration kerf being at a level above the substantially horizontal upper surface of the access kerf.
0. 41. The suspended ceiling of claim 39 wherein for each of the plurality of panels, the substantially horizontal lower surface of the registration kerf extends substantially parallel to the tread of the registration step.
0. 42. The suspended ceiling of claim 39 wherein for each of the plurality of panels, the substantially horizontal lower surface of the registration kerf extends substantially parallel to the tread of the second edge.
0. 43. The suspended ceiling of claim 36 wherein for each of the plurality of panels, the upper lip of the second edge has an end surface that is inwardly offset from an end surface of the lower lip of the second edge.
0. 44. The suspended ceiling of claim 43 wherein for each of the plurality of panels, the lower lip of the second edge comprises a cutout.
0. 45. The suspended ceiling of claim 44 wherein for each of the plurality of panels, the cutout of the lower lip of the second edge comprises a substantially vertical surface and a substantially horizontal surface, and the substantially vertical surface of the cutout of the lower lip of the second edge is inwardly offset from the end surface of the lower lip of the second edge, and the end surface of the upper lip of the second edge is inwardly offset from the substantially vertical surface of the cutout.
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This application is a reissue of U.S. Pat. No. 6,108,994, filed Aug. 12, 1998, and issued Aug. 29, 2000; the contents of which are hereby incorporated herein in their entirety.
1. Field of the Invention
This invention relates to a panel for use with a supporting grid in a suspended ceiling. The panel is of the type that conceals part or all of the grid, when viewed from below.
2. Background Information
Suspended ceilings are common. They use a grid of metal beams in the form of an inverted T-section, commonly of a 15/16″ flange width dimension, to support the panels. The rectangular openings formed by the grid are generally either 24″×24″ or 24″×48″ with correspondingly sized panels. However, irregularly shaped and sized openings and panels are used. Dimensions may be in metric units.
The present invention applies to such suspended ceilings and panels.
The panels are of various ceiling substrates, such as mineral fiber, fiberglass, wood, metal, plastic, or other composition. They are positioned within the grid opening, and are supported by the grid. The panels are either of the type that expose the grid when the ceilings are viewed from below, or conceal the grid either fully or partially, when viewed from below. This invention involves those panels that conceal the grid when viewed from below.
Panels for a ceiling with exposed grids have a form of upper lip extending over the top of the grid with no lip on the panel below the grid. The panel hangs from the grid, by means of this upper lip. Such panel is relatively simple to install, position and remove. These panels are not intended to be locked by themselves to the grid.
Panels that conceal the grid from below, on the other hand, pose special problems, since the portion of the edge underlying the grid interferes with any simple installation, positioning, and removal. Panels that conceal the grid, however, are desirable for among other benefits, their appearance, as well as their ability to lock to the grid. The grid can be partially or totally hidden. Additionally, since the panels of this type cover the metal grid, they can have a beneficial effect during a fire, since they serve to insulate the metal from the effects of the heat, particularly, where panels are of a fire retardant material, as is generally the case.
Since panels that conceal generally have a lip below the grid as well as one above the grid, there is the potential for locking the panel to the grid. This is especially useful again during a fire, and even more so during a seismic disturbance. Falling panels during a quake present a serious threat to the safety of persons present below the ceiling, and particularly so where gatherings occur such as in auditoriums or public areas.
Panels locked to the grid which give no visual clue to their removal procedure also provide a degree of security against unauthorized access to the space above the ceiling.
Notwithstanding the desirable features of panels that conceal the grid, their use has been limited to a great degree because of problem with installation and removal. In some instances, special shaped grids must be used. In other designs, auxiliary clips or metal attachments to the grid are necessary. Generally, the space above the grid must be used in installing, or removing the panel, requiring such space to be available, thus reducing room height.
In some instances, the installer must position each panel visually from below, with a resulting slowdown in installation. Even without the necessity of visual positioning during installations, in prior art panels that conceal, the installation is a relatively slow procedure.
Often, in prior art, special tools were necessary to install or remove panels that lock or conceal.
Prior art patents relating to panels in suspended ceilings that conceal the grid, and in some instances lock, include U.S. Pat. Nos. 2,218,092, 3,640,012, 3,714,752, 3,900,997, 4,189,895, 4,696,141, 4,760,677, 4,862,663, and U.K. Patent 2,200,151B, and French patents 1,313,963, and 1,227,191. These panels show various edge designs that engage the grid.
The panel of the present invention is easy to install in a ceiling. Two opposed active, parallel edges, designated first and second edges A and B, different from one another in profile, without interference from at least two opposed passive third and fourth edges C and D that can be the same as one another, enable the panel to be pivoted about designated active first edge A in engagement with a flange, into a generally horizontal position. The panel is then shifted to engage the opposing active edge, designated second edge B, with its adjacent grid flange. During the shift, the panel slightly rotates, seats, and locks into position. In effect, the opposed active first and second edges A and B, each with its distinctive profile different from the other, serve successively as hinges, with the adjacent grid flange, to install the panel.
Since the panel is installed in the ceiling from below with no need for access to space above the grid, higher ceiling heights are possible, and there is no interference with plenum utilities during panel installation or service.
When installed, the panel
The panel is also easy to remove from the ceiling, providing the removal procedure is known. Once it is known how to locate a specific edge, the installation steps are simply reversed, to remove the panel.
No tools are necessary to install or remove the panel.
The present invention can be used not only with rectangular panels, but also with hexagonal, octagonal, and other regular and irregular shapes. It is only necessary that the panel have two active, opposing, parallel first and second edges A and B having distinctive profiles, different from one another, each with the profile disclosed herein. The remaining edges of the panel are passive.
The panel 20 of the invention is of the type, which is installed in a grid ceiling 21, supported by metal grids 22 having inverted T cross-sections. Such grids 22 are generally used to form a square opening 23, of a 24″×24″ dimension as shown in
Additionally, a panel may carry a decor or fanciful design on its lower face, or a sculptured surface that provides a three dimensional effect to the ceiling.
In the embodiment described below, the invention is shown on a square panel, of for instance, a 24″×24″ dimension.
The panel 20 can be of any various substrates, such as mineral fiber, fiberglass, wood, metal, plastic, or other composition. The substrate however, must be capable of having formed on a panel the edge profiles disclosed herein. The thickness of the panel can be determined by forming the edges and then inserting and removing the panel to determine whether the edges resist damage, and are capable of supporting the panel in the ceiling, without being damaged. A thicker panel, however, results in the use of more material, so that an economic judgment must be exerted with respect to suitability of material used in this invention.
Grid 22, as seen in cross-section in the figures has, in the well-known fashion, a bulb 25, a web 26, and a flange having sides 28 and 29. The total flange width is generally 15/16″. The invention works with all size flanges. As can be seen from the detailed disclosure that follows, the profile must be correspondingly sized to accommodate the different sized flanges.
The panel 20, in position in ceiling 21, has a flat top plane 31, and a flat bottom plane 32. The description of the panel in the following disclosure refers to the panel elements when the panel extend in a horizontal plane, as in a ceiling.
The invention involves opposed active first and second edges A and B, and opposed passive third and fourth edges C and D, on panel 20. A and B, active edges, are different from one another in profile. The edges are active in installing and removing a panel into and from the grid as later described in the text and drawings. Third and fourth edges C and D, passive edges, are alike. These edges are passive in installing and removing the panel from the grid as later shown and described in the drawings and text. Both first and second edges A and B have a horizontally extending kerf, designated access kerf 33 on edge A and registration kerf 35 on edge B, intended to receive a supporting grid flange side 28 or 29. Registration kerf 35 on edge B has an upperside or tread 30 that extends in a horizontal plane.
The access kerf 33 in first edge A is thick and deep enough to slidably receive flange side 28 or 29 of the grid flange, and deep enough to permit opposite second edge B to be rotated up into a position when registration kerf 35 in edge B aligns with its corresponding grid flange, as seen in
As seen, for instance, in
Upper lip 42 on edge A is cut back at 55, and upper lip 43 is cut back at 56 to avoid interference with the installation and removal of panel 20 into ceiling 21. Such installation and removal will be explained.
Lower lip 41 on edge B is thicker than lower lip 40 on edge A.
Lower lip 45 on edge C and lower lip 46 on fourth edge D also contribute to locking the installed panel 20 to the grid 22, as well as concealing the grid. The panel 20 is positioned horizontally within ceiling opening 23 by registration kerf 35, riser 34 of registration step 36, and wall 37 on third edge C and wall 38 on fourth edge D. Third and fourth edges C and D also have cutouts 50 on third edge C and 51 on fourth edge D, which permit installation and removal of the panel 20 without interference from these edges.
Access kerf 33 and registration kerf 35 are at different levels in the thickness of the panel 20. As viewed in profile, registration kerf 35 is at a higher level in the panel than access kerf 33. This permits a hinge action in the installation and removal of the panel as will be evident from the later explanation.
The edges A, B, C, and D on the rectangular panel 20 of the invention provide means for installing, positioning, locking, unlocking, and removing the panel in and from a suspended ceiling supported by a grid. The same means used for installing and locking are used to unlock and remove the panel from the ceiling. The panel edges A, B, C, and D also have means to conceal the flanges of the supporting grid when the panel is in place in the ceiling.
a) The First Step in Installing
b) Second Step in Installing and Positioning
c) Locking
d) Removal
When a slight upward force is exerted on the center of the panel, first edge A will move slightly upward about the registration kerf 35 in second edge B as a hinge as seen in
In
It is important to note that there remains above cutouts 47″ and 48″ extended surfaces 65′ and 65″. These surfaces serve to guide access kerf 33 and registration kerf 35 into alignment with the adjacent grid flange and contribute to the feedback positioning aspect of the invention.
Lower lips 40′ and 41′ in the embodiment of
Any or all of the lower lips in any of the embodiments of the invention may be of irregular shape, such as scalloped, when viewed from below, to provide a further decorative effect to the ceiling.
Unless increased upward pressure is exerted on first edge A, the spring interferes with the entry of the flange into access kerf 33 on first edge A, as shown in
The invention can be used on panels with shapes other than rectangular. Such shapes must have opposed active first and second edges A and B with the profiles disclosed above. The remaining edges must all be passive, with no upper lips. Such shapes will have at least two opposed passive third and fourth edges C and D, each of which is positioned between the active first and second edges A and B.
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