Key for a lock of the plunger operated type

Details Key for a lock of the plunger operated type Key for a lock of the plunger operated type

1981-07-09

1985-01-08

Wolfe, Robert L.

Locks

Portable

Padlocks

70386, 70395, 70411, 70412, E05B 1918, E05B 3506

Patent

active

044921004

ABSTRACT:
A key for a lock of the plunger operated type in which an elongated housing has an internal axially movable plunger which releases locking elements when moved toward the open end of the housing, said key having a body with elongated fingers forwardly from the housing and an elongated mandrel disposed between the fingers. A spacer is disposed at the rear end of the fingers and protrudes forwardly from the foremost face of the key housing for abutting a portion of the lock to limit the distance the fingers can extend into the lock. The housing has a head portion which is axially adjustable in relation to the spacer to vary the amount the spacer projects forwardly from the housing.
In one embodiment of the invention internal structure is provided that allows the fingers to shift forwardly a predetermined distance if the forward end of the housing is removed by grinding in an effort to modify the key for use in locks with which it is not intended for use. Such forward movement causes the fingers to spread on the mandrel, rendering the key inoperative for use in any lock.

REFERENCES:
patent: 3033016 (1962-05-01), Moberg
patent: 3330141 (1967-07-01), Greenwald
patent: 3446045 (1969-05-01), Finck
patent: 3478548 (1969-11-01), Finck
patent: 3727440 (1973-04-01), Greenwald et al.
patent: 4058992 (1977-11-01), Nielsen
patent: 4252006 (1981-02-01), Swisher
patent: 4313319 (1982-02-01), Haus et al.

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