Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Outside corner or peripherally bordered
Patent
1975-06-06
1977-05-24
Bell, J. Karl
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Outside corner or peripherally bordered
52726, 52731, 403402, E04C 238
Patent
active
040246914
ABSTRACT:
The invention relates to a corner key reinforcement brace for strengthening the joint between the beveled ends of abutting tubular metal members such as found in the frame of metallic storm or screen doors. The corner key is internally slip-fitted within each of the adjacent, abutting frame members in a manner so that a relatively close tolerance is maintained between the inner walls of both tubular members and the corner key. The corner key is formed of two substantially identical half sections having first and second leg portions disposed at substantially right angles to one another. All of the leg portions are substantially U-shaped in transverse cross section with one pair of corresponding legs having the top edges of the sidewalls thereof bent inwardly. Accordingly, the half sections are inverted with respect to one another and are engaged or mated together with the leg portion of each half section having inwardly flared sidewalls being received between the substantially straight sidewalls of a non-corresponding leg portion of the adjacent, inverted half section.
REFERENCES:
patent: 898751 (1908-09-01), Krantz
patent: 2544512 (1951-03-01), Scruggs
patent: 2767814 (1956-10-01), Johnson
patent: 2884669 (1959-05-01), Hillson
patent: 3304108 (1967-02-01), Hamilton et al.
patent: 3374597 (1968-03-01), Whitener
patent: 3574378 (1971-04-01), Heywood
patent: 3642310 (1972-02-01), Hudson
patent: 3736035 (1973-05-01), Brown et al.
Gasper John A.
Goetz Charles P.
Hansen Barton G.
Bell J. Karl
Roblin Industries, Inc.
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