Locks – Hasp – Key lock
Patent
1975-08-13
1977-05-31
Wolfe, Robert L.
Locks
Hasp
Key lock
70 34, 7DIG60, E05B 6548, E05B 6736
Patent
active
040261328
ABSTRACT:
A high security lock which is guarded against picking. A disk shaped body is fixed to a hasp and contains a diametric bore with a lock core-receiving chamber at each end. Two cores in such chambers have key plugs which lie on the axis of the bore and are both solidly connected to each other through a rotary bolt which lies between them. The bolt partially intersects a post-receiving recess in the rear face of the body so as to lockingly engage a grooved post over which the hasp is engaged, and has a side-cut-out to clear such post when the bolt is rotated with both of the two key plugs to an unlocked position. A guard casing is rotatably mounted over the lock body and the two lock cores, and has only a single key opening. Operation requires rotating the guard to one position which exposes one key slot, inserting a stub key in that key slot, then rotating the guard to another position which exposes the other key slot, and then inserting a second key and using it to rotate both of the interconnected key plugs and the bolt through which they are connected. Since the two key slots are exposed only one at a time, they cannot be simultaneously picked, and the solid interconnection between the key plugs prevents picking one core and leaving it partly turned while picking the other core.
REFERENCES:
patent: 1907524 (1933-05-01), Ellenberger
patent: 2544305 (1951-03-01), Finke
patent: 2834195 (1958-05-01), Stackhouse
patent: 3820360 (1974-06-01), Best
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