Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Outside corner or peripherally bordered
Patent
1978-08-03
1980-03-18
Ridgill, Jr., James L.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Outside corner or peripherally bordered
403231, 52455, 52735, E04C 238
Patent
active
041932455
ABSTRACT:
There is disclosed a door frame construction, preferably of metal, which comprises cross channel members assembled perpendicularly with a pair of parallel upright channel members to form a rectangular frame. The respective channel members are held in assembled squared relation by a novel type of joint construction, which joint includes a pair of elongate slots formed in ones of the channel members which slots cooperating receive first detent members formed on the other of the channel members. The first detent members prevent disassembly of the joined channel member in a generally lateral direction. In addition, said slot also cooperates with second detent members received therein, which preclude relative pivotal movement between the assembled channel members and thereby serve to maintain the channel members in squared relation.
REFERENCES:
patent: 1220163 (1917-03-01), Anderson
patent: 2632928 (1953-03-01), Kaufman
patent: 4021988 (1977-05-01), Edeus et al.
Lawrence Brothers Inc.
Ridgill, Jr. James L.
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