Push-button combination lock

Details Push-button combination lock Push-button combination lock

1975-11-20

1977-06-07

Frazier, Roy D.

Locks

Special application

For control and machine elements

70306, 70313, 70316, E05B 3702, E05B 3716

Patent

active

040275086

ABSTRACT:
A push-button combination lock for doors or the like having buttons which must be pushed in a prescribed combination and prescribed number of times to release the lock. The lock may be reset to a new combination by use of the same pushbuttons when operated in accordance with the newly desired combination. No tools or dismantling of the lock is required to change the combination. A bypass feature enables one to bypass the lock from the inside of the door.

REFERENCES:
patent: 215229 (1879-05-01), Lewis
patent: 615886 (1898-12-01), Ormond
patent: 1374749 (1921-04-01), McCarthy
patent: 1452503 (1923-04-01), Grubb
patent: 1483993 (1924-02-01), Sprowles et al.
patent: 1771080 (1930-07-01), Fitzsimmons
patent: 2165674 (1939-07-01), Pelle
patent: 2580830 (1952-01-01), Pelle
patent: 3040556 (1962-06-01), Rosenhagen
patent: 3616667 (1971-11-01), McGourty
patent: 3667261 (1972-06-01), McGourty

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