Ladder hinge and multi-position locking mechanism therefor

Details Ladder hinge and multi-position locking mechanism therefor Ladder hinge and multi-position locking mechanism therefor

1981-12-21

1983-10-04

Weidenfeld, Gil

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Hinge

Including means to hold or retard hinged members against...

16329, 182 22, 182163, 403 92, E05D 1110, F16C 1110

Patent

active

044070454

ABSTRACT:
An improved hinge for a collapsible ladder includes a pivot pin which has a sufficiently simple construction to permit it to be fabricated by die-casting on a cost-competitive basis. The simple construction is made possible by an improved axial detent arrangement for a shaft which rotates and slides within the hub and to which the hinge locking pins are secured. The detent arrangement includes a detent bore extending radially biased against the shaft. A suitable detent recess in the shaft is angularly aligned with the detent bore for each locking position of the shaft. Axial alignment of the bore and a recess is achieved by fully extending the shaft out of the hub against the restoring force of a bias spring in the hub. The recess and bias member are contoured to permit disengagement of the detent by rotation of the shaft but not by axially applied forces.

REFERENCES:
patent: 3692143 (1972-09-01), Kummerlin
patent: 3811151 (1974-05-01), Kummerlin
patent: 3955240 (1976-05-01), Schuh et al.
patent: 4025109 (1977-05-01), Klingelhofer
patent: 4210224 (1980-07-01), Kummerlin et al.
patent: 4216844 (1980-08-01), Klafs

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