Plunger-operated lock

Details Plunger-operated lock Plunger-operated lock

1977-04-04

1977-12-20

Wolfe, Robert L.

Locks

Portable

Padlocks

70386, E05B 6736

Patent

active

040634345

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, the stem being biased to the locking position by a coil spring so dimensioned that when the spring is fully compressed with the coils touching each other, the pin just reaches the unlocking position. Hence if an attempt is made to open the lock by inserting a bent wire or the like into a spring coil and pulling to compress the spring, the pin will not be able to move to the unlocking position.

REFERENCES:
patent: 1923025 (1933-08-01), Morse
patent: 3714802 (1973-02-01), Morse
patent: 3835674 (1974-09-01), Hoyt
patent: 4015456 (1977-04-01), Moberg

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