Square shaped axial split pin tumbler lock

Details Square shaped axial split pin tumbler lock Square shaped axial split pin tumbler lock

1989-08-30

1990-02-13

Gall, Lloyd A.

Locks

Operating mechanism

Key

70404, 70409, E05B 2708

Patent

active

048995657

ABSTRACT:
An improved axial split pin tumbler type lock is provided. The improvement consists in providing a cylinder having a lock head formed with a square-shaped keyhole defining a front face on the lock head, and a three-part plug assembly inserted in the cylinder. One of the three-part plug assemblies consists of a cylinder head having a forward end provided with a square-shaped cut-out section formed therein, the square cut-out section radially traversing the tumbler bores formed therein. A tubular key is provided having an inner circular core, and an outer square-shaped face adapted to matingly engage within the square-shaped keyhole in the lock head and the square-shaped cut-out section in the cylindrical head portion. The square-shaped front face of the lock head includes a series of thickened face sections alternating with a series of thinner face sections. The driver tumbler positioned in the bores of the cylindrical head ride immediately beneath the square-shaped front face of the lock head such that the tumblers are at least partially shielded from manipulation by a lock pick by the thickened sections of the front face thereby to render the lock more pick resistant.

REFERENCES:
patent: 1458520 (1923-06-01), Castell
patent: 3267706 (1966-08-01), Kerr
patent: 3681955 (1972-08-01), Sturgeon
patent: 4041739 (1977-08-01), Mercurio
patent: 4100777 (1978-07-01), Fredon
patent: 4191036 (1980-03-01), Steinbach

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