Fire escape – ladder – or scaffold – Ladder – Supporting surface compensating means
Patent
1991-12-02
1993-11-30
Chotkowski, Karen J.
Fire escape, ladder, or scaffold
Ladder
Supporting surface compensating means
182204, E06C 100
Patent
active
052656985
ABSTRACT:
An extendable stepladder has a pair of front legs and a pair of rear legs (10), first steps for connecting the front legs together and second steps for connecting the rear legs together. A slider (12) which is telescopically arranged on the outer surface of each leg has a cut-out portion (18) thus forming a vertical passage along each leg. The knob (22) is capable of sliding upwardly and downwardly along the cut-out portion. Each slider has a bracket (19) which has an opening (20). When the sliders of the front legs or the rear legs are extended to a length greater than the length of the rear legs or the front legs respectively, the ladder is firmly secured by means of a bolt (24) which is received in an opening in the front and rear legs. Further, a female T-bolt (30) having four prongs (32), and an internally threaded shaft (34) the shaft having a proximal end and an opposite end is provided. The bolt (24) is inserted into the proximal end of the shaft ( 34) and the prongs are held between each of the legs and each of the shafts (34) and a tension knob shaft (60) is inserted through the opposite end of the shaft (34) whereby full locking compression is achieved.
REFERENCES:
patent: 349666 (1886-09-01), Rowland et al.
patent: 1312725 (1919-08-01), Gagnier
patent: 1323227 (1919-11-01), Kirby
patent: 1346831 (1920-07-01), Lehmann
patent: 1491642 (1924-04-01), Swain
patent: 1568201 (1926-01-01), Allen
patent: 2129401 (1938-09-01), Botinger
patent: 2306797 (1942-12-01), Biery
patent: 2481581 (1949-09-01), Ehnhuus
patent: 4676342 (1987-06-01), Godde
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