Locking key with memory

Details Locking key with memory Locking key with memory

1984-05-25

1986-12-30

Wolfe, Robert L.

Locks

Operating mechanism

Key

70408, 70432, E05B 4100, E05B 1904

Patent

active

046319433

ABSTRACT:
A locking key, designed to preserve an indication of the lock-shifting (opening or closing) operation last performed, has a shank with an extension shaft rotatably received in an adjoining head, the relative rotation of the shank and the head being limited to 90.degree. or 180.degree. by a retaining pin in the head coacting with a part-circular recess on the shaft. The pin and the recess also serve to hold the head in a fixed axial position with reference to the shank. A spring-loaded detent in the shaft or elsewhere inside the head serves to index the two key portions in either of their limiting relative positions.

REFERENCES:
patent: 2176465 (1939-10-01), Merkl
patent: 2198484 (1940-04-01), Merkl
patent: 2373893 (1945-04-01), Hoenger
patent: 2418046 (1947-03-01), Oberfield
patent: 4432218 (1984-02-01), Hoener
patent: 4440011 (1984-04-01), Klein

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