Inexpensive keyless user custom coded lock

Details Inexpensive keyless user custom coded lock Inexpensive keyless user custom coded lock

1988-09-22

1990-09-04

Wolfe, Robert L.

Locks

Special application

For closures

70 90, 70 74, E05B 6500

Patent

active

049533720

ABSTRACT:
Very simple, inexpensive keyless window sash combination code lock has a pivotable cover plate for preventing an intruder from unscrewing the conventional screws for mounting the lock to the sashes. Three combination code dials are slip coupled to associated rotatable pins which pass through the cover plate and an apertured anchor plate. The pins have lugs positioned under the anchor plate to prevent the lock from being opened. When the lugs are positioned within the anchor plate upon installation, the user rotates the dials to create his own custom combination code. The cover plate is then lowered, the dials are rotated and the lock is locked. The code dials are press fitted about the cylindrical locking pins to save manufacturing costs, and the manual sensing of the correct positioning of the code dials by an intruder, to open the lock, is prevented by providing radial dummy recesses in the lower surface of the anchor plate about each locking pin.

REFERENCES:
patent: 534987 (1895-03-01), Alsdorf
patent: 546649 (1985-09-01), Bray
patent: 638492 (1899-12-01), Barr
patent: 825616 (1906-07-01), Rosenberg
patent: 1841334 (1932-01-01), Long
patent: 2131315 (1938-09-01), Dunseath
patent: 2634146 (1953-04-01), Johnson
patent: 2648966 (1953-08-01), Polak
patent: 3152467 (1964-10-01), Fanning
patent: 3186198 (1965-06-01), Noerrenberg-Sudhaus
patent: 3279226 (1966-10-01), Chance
patent: 3350902 (1967-11-01), Chance
patent: 3934908 (1976-01-01), Rifkin
patent: 3956911 (1976-05-01), Corboud
patent: 4050724 (1977-09-01), Nakanishi
patent: 4771617 (1988-09-01), Dueringer

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