Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Hinge – Including means to hold or retard hinged members against...
Patent
1983-10-03
1986-01-28
Silverberg, Fred
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Hinge
Including means to hold or retard hinged members against...
16349, 16353, 16372, 182 22, 182163, E05D 1110
Patent
active
045661502
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 et al.
patent: 3811151 (1974-05-01), Kuemmerlin
patent: 3955240 (1976-05-01), Schuh et al.
patent: 4025109 (1977-05-01), Klingelhofer et al.
patent: 4210224 (1980-07-01), Kummerlin et al.
patent: 4216844 (1980-08-01), Klafs
patent: 4403373 (1983-09-01), Kummerlin
patent: 4407045 (1983-10-01), Boothe
Little Giant Industries Inc.
Silverberg Fred
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