Frame structures, especially for inspection and access openings

Details Frame structures, especially for inspection and access openings Frame structures, especially for inspection and access openings

1993-12-07

1995-07-18

Friedman, Carl D.

Static structures (e.g., buildings)

Openwork; e.g., truss, trellis, grille, screen, frame, or...

Outside corner or peripherally bordered

526561, 526562, 403402, E04C 238

Patent

active

054330548

ABSTRACT:
An inner frame for a cover and an outer frame for an inspection opening can be formed with frame members having flanges projecting from the plane of the frame and formed with tongues at their ends engageable by resilient hooks of the respective corner elements which fit without play against the frame members. The frame ends are cut at right angles to the longitudinal edges of the frame member in the case of the outer frame and are provided with abutting miters in the case of the inner frame.

REFERENCES:
patent: 3627359 (1971-12-01), Paul
patent: 3673674 (1972-07-01), Catalle
patent: 3709533 (1973-01-01), Walters
patent: 3797194 (1974-03-01), Ekstein

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