Plunger-operated lock

Details Plunger-operated lock Plunger-operated lock

1976-06-28

1977-04-05

Wolfe, Robert L.

Locks

Portable

Padlocks

70386, 70395, E05B 6736

Patent

active

040154564

ABSTRACT:
A lock of the type having an internal plunger with a stem for being gripped by a tool to pull the stem axially to release locking means, in which said stem has a separate portion protruding from the rear end which is spring biased against the forward portion of the stem. When attempts are made by unauthorized persons to open the lock by forcing an elongated member (such as a piece of tubing) into engagement with the protruding portion, the protruding portion is driven back into the forward portion, so that the tubing cannot become engaged therewith.

REFERENCES:
patent: 3033016 (1962-05-01), Moberg
patent: 3446045 (1969-05-01), Finck
patent: 3714802 (1973-02-01), Morse
patent: 3835674 (1974-09-01), Hoyt

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