Locks – Operating mechanism – Key
Patent
1991-12-30
1993-07-13
Gall, Lloyd A.
Locks
Operating mechanism
Key
70373, 70386, 70DIG39, E05B 2704
Patent
active
052263045
ABSTRACT:
An interchangeable core and housing assembly comprising a cylinder housing (42) which has a central opening with an alignment bracket (44) in one part of its cross-section and an interchangeable core (60) in the remaining part. The interchangeable core comprises a cylinder body (61) with a central bore and a radial projection (62) which fits into a radial slot of the aligning bracket. The radial projection has a plurality of radial recesses containing a plurality of spring-loaded top driver pins (66). A cylinder plug (46) is a inserted into the central bore of the cylinder body. Cylinder plug has dimples (78 and 80) on its exterior, a keyway (82), and a plurality of radial recesses with bottom pins (67). Interchangeability of the core is achieved by providing an annular groove (55a and 55b) formed in the central opening of the cylinder housing and locking balls (84 and 85) installed into holes (70, 71, 72, and 73) of the cylinder body. The balls are moveable between a first position, in which the interchangeable core is locked in the cylinder housing, and a second position, in which the interchangeable core in unlocked from the cylinder housing and can be withdrawn therefrom. The interchangeable core can be unlocked and only when a control key (49), which had dimples (49c and 49b) sufficiently deep to put the locking balls flush with the outer surface of the cylinder body, is inserted and turned to a predetermined angle.
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Gall Lloyd A.
Pressman David
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