Combination lock

Details Combination lock Combination lock

1984-05-22

1986-12-09

Wolfe, Robert L.

Locks

Special application

For control and machine elements

70313, 70315, 70DIG9, E05B 3700

Patent

active

046272500

ABSTRACT:
A resettable combination lock includes a plurality of user depressable buttons and a user-settable interposers for coupling selected ones of the buttons to a first button-actuation counter that counts correct button depressions and the other of the buttons to another button-actuation counter that counts incorrect button depressions. In addition, each button is coupled to a third counter that counts the total number of button actuations. In order to effect unlocking, the correct button sequence must be pushed to cause the first counter to count the proper number of correct button actuations and the third counter to count the proper number of button actuations without registering a single count on the second counter. The incrementing of a single count on the second counter, which indicates the depressing of a button not in the unlock sequence, will prevent the lock from being unlocked.

REFERENCES:
patent: 1161218 (1915-11-01), Kaps
patent: 1620757 (1927-03-01), Ferris
patent: 1684908 (1928-09-01), Brunelle
patent: 1835691 (1931-12-01), Breker
patent: 2132201 (1938-10-01), Allman
patent: 2529119 (1950-11-01), Wallach et al.
patent: 2536429 (1951-01-01), Dury

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