Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Fabric or lattice; e.g. – indeterminate grating
Patent
1986-11-28
1988-11-22
Murtagh, John E.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Fabric or lattice; e.g., indeterminate grating
52484, E04B 552
Patent
active
047856033
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.
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patent: 4601153 (1986-07-01), Dunn
patent: 4677802 (1987-07-01), Vukmanic
Chovanes Eugene
Murtagh John E.
National Rolling Mills Inc.
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