Abstract: A separate connector piece for use in constructing a suspended ceiling grid system is provided. The grid system is of the type consisting of a series of parallel longitudinal beams interconnected with a series of perpendicular cross runners. The connector piece is selectively attached to the ends of the cross runners, and forms the interconnections when the cross runners are aligned on opposite sides of a longitudinal beam. The connector pieces of the opposing cross runners extend through a slot located in the longitudinal beam and may be attached to the opposing cross runner, thus forming the interconnection.

Abstract: A suspended ceiling system for supporting ceiling panels and the like includes a plurality of main runners, connected in end-to-end relationship to form parallel beams, and a plurality of cross runners interconnecting the parallel beams to form a grid.Each main runner includes an end connector, having an opposed pair of laterally projecting hooks which form a guideway for receipt of the forward end of a corresponding main runner end connector. The face of each end connector is continuous, from one side of the hooks to the other, to provide a bearing surface for sliding the end connectors through their respective guideways. Respective apertures and detents are formed in each end connector to provide opposed engaging surfaces for interlocking the end connectors in side-by-side relationship.The cross runners include respective end connectors which interlockingly engage when inserted from opposite directions through a slot in the web of the main runner.

Abstract: A combination light and air ventilation fixture for suspended ceilings is provided. A surrounding frame forms the air supply and air exhaust ducts, in addition to supporting the light producing portion of the fixture. The air ducts are substantially identical in construction, each consisting of two planar, stamped formations, joined together, with the air passageway located therebetween. A separate U-shaped, stamped formation separates the different air ducts to complete the frame. These U-shaped members are provided with lower flanges, corresponding to the lower flanges of the air ducts, and thus appear visually continuous with the air ducts. Cast corner members join the planar formations of the air ducts to the U-shaped members, forming the completed frame. Placement of the fixture in the suspended ceiling support grid is assisted by placement clips attached to the frame, which are received by slots located in the ceiling grid.

Abstract: An apparatus for constructing an interlocked grid system which may be suspended from the main structure of a building for use as a ceiling panel support is disclosed in which transverse members interlock with suspendable support members. A tongue on each end of opposing transverse members communicates with a rectangular hole in the support member. The upper and lower edge of each tongue is deflected to form upper and lower shoulders which face backward toward the transverse member. Upon insertion of the tongue into the rectangular hole, the shoulders engage the support member at the upper and lower ends of the rectangular hole. The leading end of the tongue is wedged and maintained in position within the orifice by a centrally located reinforcement bead on the opposing transverse member. The reinforcement bead extends across the junction of the tongue with the transverse member to perform a reinforcing function as well as the wedging function.