Frangible spindle

Details Frangible spindle Frangible spindle

1986-02-06

1987-05-26

Moore, Richard E.

Closure fasteners

Latch spindles

292 1, 70422, E05C 116

Patent

active

046679944

ABSTRACT:
A spindle assembly is provided for retracting a latch bolt of a lock set having separate independently rotatable inside and outside latch bolt-retracting hubs. The spindle assembly includes an inside spindle for operating the inside hub, an outside spindle for operating the outside hub, and a connection member for rotatably interconnecting the inside and outside spindles. The outside spindle includes an inner spindle portion for engaging the outside hub, an outer spindle portion for supporting a lever handle or the like, and a frangible portion interconnecting the inner and outer portions. The frangible portion is configured to transmit spindle-twisting torque from the outer spindle portion to the inner spindle portion in response to application of a torque in excess of a first predetermined amount. The frangible portion is also configured to break at a shear plane in response to application of a torque in excess of a second greater predetermined amount to the outer spindle portion of the outside spindle while the inner spindle portion is fixed against rotation.

REFERENCES:
patent: 1308521 (1919-07-01), Butter
patent: 1472481 (1923-10-01), Lockwood
patent: 2702204 (1955-02-01), Collier
patent: 4471984 (1984-09-01), Bellantuono
patent: 4502720 (1985-03-01), Fayerman et al.

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