Fire escape – ladder – or scaffold – Ladder
Patent
1980-09-15
1982-11-02
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
182228, 29521, 29522R, 29514, 403242, 403282, B25G 300, B23K 3102, F16B 900, F06C 750
Patent
active
043568882
ABSTRACT:
A structural joint for joining two elements, the first element having an elongate major tongue of malleable deformable material and in one embodiment an elongate minor tongue, the second element having a curled tab. The major and minor tongues define an elongate recess adapted to receive the curled tab on joint formation. The two elements are pressed together to press the curled tab of the second element into the recess between the minor and major tongues of the first element and to cause the minor tongue and the second element to mutually penetrate and deform each other. The major tongue is then deformed about the curled tab to form at least a portion of an encircling curl which contacts the curled tab's external surface. When the elements are so joined, the gap between the major and minor tongues is less than the width of the curled tab, thereby precluding removal of the curled tab from the encircling curl. In another embodiment the curled tab is curled about a wire which acts as a filler or support, and the major tongue is deformed about the curled tab as before. The invention also comprises a ladder having rungs secured to side rails by structural joints in accordance with this invention.
REFERENCES:
patent: 991779 (1911-05-01), Hoage
patent: 2201193 (1940-05-01), McMahan
patent: 3022857 (1962-02-01), Rich
patent: 3085651 (1963-04-01), Rich
patent: 3085652 (1963-04-01), Rich
patent: 3970400 (1976-07-01), Reid
patent: 4080713 (1978-03-01), Reid
patent: 4162861 (1979-07-01), Reid
patent: 4204587 (1980-05-01), Larson
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