Abstract: A perimeter clip to tie the end of a beam in a dropped grid ceiling to an angle wall molding. The clip is in right angle form with one leg hooked to the molding and the other leg formed to receive and secure the end of a beam. The clip is desirably formed from a flat, stamped piece of metal.

Abstract: A fire strip for a suspended grid ceiling has an inner spring steel web having a slightly arcuate cross section, and an outer web of soft steel wrapped around the inner web. A finished strip is formed by bending the strip normal to the strip body at both ends. When the ends are bent, a spring-like, yieldable, upwardly curved arch is formed which fits snugly against a panel when in place in a ceiling.

Abstract: A compression leg that is applied to the hanger wire of a suspended grid ceiling. The leg is formed with a cross section having a portion intended to envelop the wire, and a channel portion that guides the leg into place about the wire. The leg is of rigid metal, and is crimped to the wire.

Abstract: A fire strip for a suspended grid ceiling has an inner spring steel web having a slightly arcuate cross section, and an outer web of soft steel wrapped around the inner web. A finished strip is formed by bending the strip normal to the strip body at both ends. When the ends are bent, a spring-like, yieldable, upwardly curved arch is formed which fits snugly against a panel when in place in a ceiling.

Abstract: A clip for securing the top channel of a partition wall to a beam of a continuously extending suspended grid ceiling. The clip has a flat base and diagonally positioned hooks on the base. The clip is applied to the beam by rotating the hooks onto the beam flanges where the clip is locked in place by locking tabs on the base.

Abstract: A fire strip for use in a suspended metallic grid ceiling structure. The strip extends between grid members in the ceiling. During a fire, the strip helps keep the grid intact, and keeps the ceiling tile in place, whereby the ceiling continues to act as a fire barrier.

Abstract: A fire-resistant suspended ceiling grid structure having cross tees and main beams, to support ceiling tiles. The structure has shear means to permit a cross tee to expand into a main beam during a fire. The shear means have a notch behind a transverse tab formed in the cross tee which acts as a stop against the main beam in normal conditions, and shears or bends during a fire to permit the cross tee to expand into the main beam and still hold the tile in place.

Abstract: A suspended ceiling grid member which comprises a web portion, an upper bulb extending along the top of the web portion, a pair of flanges extending outwardly from the bottom of the web portion, the flanges being adapted to support ceiling tiles, and a lower bulb extending downwardly from the flanges, whereby the lower bulb provides greater strength to the suspended ceiling grid member and also enhances the appearance thereof.

Abstract: In a suspended ceiling grid structure adapted to support ceiling tiles or the like, connecting apparatus between ceiling grid inverted T main and cross members disposed at right angles to each other and having upright central fins and bottom horizontal flanges comprise a tongue extending from each end of the cross members, a locking tab formed in the tongue of the cross members that is V-shaped in cross section and contacts the web of the main member when a cross member has been inserted through a slot in the main member, an opening in the tongue of the cross member that allows the locking tab to flex back when the cross member is inserted through a slot in the main member, a fingernail and fingernail interlocking pocket formed in each end of the cross member to interlock oppositely disposed cross members together and an interlock release pocket formed in the bottom of the fingernail interlocking pocket to disengage interlocked cross members without damage to either cross member.

Abstract: In a suspended ceiling grid structure adapted to support ceiling tiles or the like, connecting apparatus between ceiling grid inverted T main and cross members disposed at right angles to each other and having upright central fins and bottom horizontal flanges comprise a vertically disposed belt loop formed in the central fin of the main member, a locking tongue extending from each end of the cross members in opposite directions at substantially right angles from the central fin of the cross member, a stiffening bead formed in the central fin of the cross member at each end of the cross member and extending through the locking tongues to an outer end portion of the locking tongues, a locking bump formed in the stiffening bead in the outer end portion of the locking tongues, positive stop shoulders at the top and bottom of the locking tongue contacting the rear edge of the belt loop on the main member when the locking tongue is fully inserted into the belt loop, and a sloping surface on the rear of the locking

Abstract: A method of making an inverted T shaped ceiling grid member comprises the steps of folding a sheet of metal to form a vertical central web with a bulb at the top and having two web sidewalls with a pair of oppositely disposed horizontal flanges extending outwardly from the bottom of the web for supporting ceiling tiles, and laser welding the two web sidewalls together by applying a laser beam thereto to form a laser weld to increase the strength and rigidity of the ceiling grid member. A cap may be attached to the flanges to cover the bottom of the flanges. A metal inverted T shaped ceiling grid member comprises a vertical web having a bulb at the top and having two web sidewalls, a pair of oppositely disposed horizontal flanges extending outwardly from the bottom of the web, and a laser weld joining the two web sidewalls together. A cap may be attached to the flanges to cover the bottom of the flanges.

Abstract: A beam for a fire-rated suspended ceiling structure wherien the beam has an inverted-T construction and includes a central web having a bulb at the top and a pair of oppositely disposed flanges at the bottom for supporting ceiling tiles, and an improved expansion relief section of the beam comprising a section of the web having a pair of spaced vertical cuts in the web and an horizontal cut extending between the upper ends of the vertical cuts to form a tab extending upwardly from the pair of flanges, the tab having an inverted triangular cut-out portion the apex thereof adjacent the pair of flanges and dividing the tab into two portions, a pair of protuberances formed in the upper edge of the tab portion contacting the upper portion of the web, and a section of the bulb having a crushed portion opposite the apex of the triangular cut-out portion, the crushed portion of the bulb having a substantially Z-shaped configuration whereby when the beam is subjected to expansion forces accompanying fire conditions th

Abstract: A beam for a fire-rated suspended ceiling structure wherein the beam has an inverted-T construction and includes a central web having a bulb at the top and a pair of oppositely disposed flanges at the bottom for supporting ceiling tiles, and an improved expansion relief section of the beam comprising a section of the web having a pair of spaced vertical cuts in the web and an horizontal cut extending between the upper ends of the vertical cuts to form a tab extending upwardly from the pair of flanges, the tab having an inverted triangular cut-out portion the apex thereof adjacent the pair of flanges and dividing the tab into two portions, a pair of protuberances formed in the upper edge of the tab portion contacting the upper portion of the web, and a section of the bulb having a crushed portion opposite the apex of the triangular cut-out portion, the crushed portion of the bulb having a substantially Z-shaped configuration whereby when the beam is subjected to expansion forces accompanying fire conditions th