Security lock and key

Details Security lock and key Security lock and key

1976-10-04

1977-08-09

Wolfe, Robert L.

Locks

Portable

Padlocks

70395, 70422, E05B 6736

Patent

active

040402797

ABSTRACT:
Attempts to pick the plunger-type (barrel) lock disclosed are frustrated by the necessity of holding one axially movable part in place against the force of a spring while retracting another axially movable member to open the lock. The key that opens the lock has a central pin stationary in use for holding back a position while radially spreading fingers frictionally engage and thereby permit withdrawal of an axially movable cylinder coaxial with the piston. A frangible member is provided for installing the lock without using the special key so that the number of keys can be strictly controlled. The key will open not only the lock of this invention, but also other kinds of plunger-type locks in common use by gas and electric utility companies.

REFERENCES:
patent: 3478548 (1969-11-01), Finck
patent: 3714802 (1973-02-01), Morse
patent: 3835674 (1974-09-01), Hoyt

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