US5428930A — Concealed grid ceiling panel system

Claim 1

Independent Claim 159 words

In combination, a `T` bar grid system, securing clips and ceiling panels, said `T` bar grid system comprising main T's and cross T's forming the grid system, each securing clip being secured to said grid system at a junction of the grid system and positioning a first segment of said clip on a main T and to one side of a cross T and positioning a second segment of the securing clip on the main T to the opposite side of said cross T, said ceiling panels including torsion springs for suspending thereof from said securing clips, said torsion springs being received in slots of said securing clips, said ceiling panels being sized to generally align corners of the ceiling panels beneath a junction of a main T and cross T, with a securing clip positioned to receive and engage a torsion spring of the ceiling panel, said ceiling panels abutting and collectively covering the grid system from below.

Claim 2

Dependent Claim 159 words

In combination, a `T` bar grid system, securing clips and ceiling panels, said `T` bar grid system comprising main T's and cross T's forming the grid system, each securing clip being secured to said grid system at a junction of the grid system and positioning a first segment of said clip on a main T and to one side of a cross T and positioning a second segment of the securing clip on the main T to the opposite side of said cross T, said ceiling panels including torsion springs for suspending thereof from said securing clips, said torsion springs being received in slots of said securing clips, said ceiling panels being sized to generally align corners of the ceiling panels beneath a junction of a main T and cross T, with a securing clip positioned to receive and engage a torsion spring of the ceiling panel, said ceiling panels abutting and collectively covering the grid system from below.

Claim 3

Dependent Claim 20 words

In combination as claimed in claim 1 wherein said first and second segments are interconnected by a frangible bridge segment.

Claim 4

Dependent Claim 23 words

In combination as claimed in claim 1 wherein said securing clips are each mechanically fastened to a main T of the grid system.

Claim 5

Dependent Claim 27 words

In combination as claimed in claim 1 wherein said grid system has a cell size and said ceiling panels are sized to correspond to the cell size.

Claim 6

Dependent Claim 57 words

In combination as claimed in claim 1 wherein said grid system defines a rectangular grid having a host of common sized cells and said ceiling panels are rectangular and of a size to cover one of the common sized cells of the rectangular grid and a portion of the main T's and cross T's defining the cell.

Claim 7

Dependent Claim 37 words

In combination as claimed in claim 5 wherein said first and second segments are interconnected by a bridge segment with said bridge segment overlying a junction of a main T and cross T of the grid system.

Claim 8

Dependent Claim 38 words

In combination as claimed in claim 6 wherein each ceiling panel has four torsion springs with each torsion spring hingedly secured at a corner of the ceiling panel and with each torsion spring releasably engaging a securing clip.

Claim 9

Dependent Claim 99 words

A securing clip for use in a suspended concealed grid ceiling system comprising: a first segment and a second segment with said first and second segments interconnected by a rigid frangible bridge segment of substantially reduced size and strength relative to said first and second segments, each of said first and second segments comprising a downwardly opening `U` shaped channel sized to closely straddle an upper bead of a `T` bar grid member, extension flanges either side of said channel with each extension flange having a slot therein formed to engage and retain opposed legs of a torsion spring.

Claim 10

Dependent Claim 99 words

A securing clip for use in a suspended concealed grid ceiling system comprising: a first segment and a second segment with said first and second segments interconnected by a rigid frangible bridge segment of substantially reduced size and strength relative to said first and second segments, each of said first and second segments comprising a downwardly opening `U` shaped channel sized to closely straddle an upper bead of a `T` bar grid member, extension flanges either side of said channel with each extension flange having a slot therein formed to engage and retain opposed legs of a torsion spring.

Claim 11

Dependent Claim 43 words

A securing clip as claimed in claim 8 wherein said securing clip includes an adjustable mechanical means associated with said `U` shaped channels which cooperates with said `U` shaped channels to effect positive securement of said clip to a `T` bar grid member.

Claim 12

Dependent Claim 17 words

A securing clip as claimed in claim 9 wherein said mechanical means is a releasable mechanical fastener.

Claim 13

Dependent Claim 27 words

A securing clip as claimed in claim 9 wherein said releasable mechanical fastener includes a metal screw which passes through a port in said downwardly opening channel.

Claim 14

Dependent Claim 67 words

A securing clip as claimed in claim 8 wherein said rigid frangible bridge segment is an extension of a bottom of the downwardly opening channels of said first and second segments and wherein said bridge segment spaces said first and second segments sufficiently to accommodate the width of a a cross `T` member forming a junction with a main `T` member of a `T` bar grid system.

Claim 15

Independent Claim 223 words

A method of replacing a ceiling system comprising a `T` bar grid and lay in panels with a concealed grid ceiling system having suspension ceiling panels supported from said `T` bar grid, comprising: removing the lay in panels of the `T` bar ceiling system to fully expose the `T` bar grid, securing clips at an upper edge of the `T` bar grid system and positioning of the clips for edge support of the suspension ceiling panels, said clips having slots either side of the `T` bar grid for engaging torsion springs, hingedly securing torsion springs to the suspension ceiling panels to accommodate horizontal suspension of the suspension ceiling panels beneath the `T` bar grid, initially suspending the suspension ceiling panels in a generally horizontal position beneath the `T` bar grid by securing the torsion springs in the clips, with the spacing of the clips on the `T` bar grid corresponding to the spacing of the torsion springs when secured on a suspension ceiling panel, urging said suspension ceiling panels upwardly to contact the lower surface of the `T` bar grid system, with said torsion springs also moving upwardly through slots of the clips and maintaining the suspension ceiling panels immediately below the `T` bar grid, said suspension ceiling panels, when secured beneath the `T` bar grid, abutting and concealing the `T` bar grid.

Claim 16

Independent Claim 223 words

A method of replacing a ceiling system comprising a `T` bar grid and lay in panels with a concealed grid ceiling system having suspension ceiling panels supported from said `T` bar grid, comprising: removing the lay in panels of the `T` bar ceiling system to fully expose the `T` bar grid, securing clips at an upper edge of the `T` bar grid system and positioning of the clips for edge support of the suspension ceiling panels, said clips having slots either side of the `T` bar grid for engaging torsion springs, hingedly securing torsion springs to the suspension ceiling panels to accommodate horizontal suspension of the suspension ceiling panels beneath the `T` bar grid, initially suspending the suspension ceiling panels in a generally horizontal position beneath the `T` bar grid by securing the torsion springs in the clips, with the spacing of the clips on the `T` bar grid corresponding to the spacing of the torsion springs when secured on a suspension ceiling panel, urging said suspension ceiling panels upwardly to contact the lower surface of the `T` bar grid system, with said torsion springs also moving upwardly through slots of the clips and maintaining the suspension ceiling panels immediately below the `T` bar grid, said suspension ceiling panels, when secured beneath the `T` bar grid, abutting and concealing the `T` bar grid.

Claim 17

Dependent Claim 27 words

A method as claimed in claim 13 wherein the ceiling panels are sized to correspond to a multiple of a cell size of the `T` bar grid.

Claim 18

Dependent Claim 35 words

A method as claimed in claim 13 including securing alignment means on the lower surface of the `T` bar grid, said alignment means engaging the ceiling panels and aligning the same beneath the grid system.

Claim 19

Dependent Claim 37 words

A method as claimed in claim 13 wherein the size of the suspension ceiling panels correspond to a rectangular cell size of the `T` bar grid system and said clips are secured adjacent corners of each cell.

Claim 20

Dependent Claim 39 words

A method as claimed in claim 16 wherein said clips are paired and straddle an intersection junction of the `T` bar grid whereby securing of said clips accurately positions suspension ceiling panels either side of a respective intersection junction.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1998-07-03	1999-01-02	1999-07-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2002-07-03	2003-01-02	2003-07-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2006-07-03	2007-01-02	2007-07-04	$7700.00	Window Closed / Lapsed

Concealed grid ceiling panel system

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