Locks – Special application – For closures
Patent
1977-06-22
1978-11-14
Holko, Thomas J.
Locks
Special application
For closures
70298, 70313, E05B 3716
Patent
active
041250052
ABSTRACT:
A mechanical lock device dispensing with a key, wherein a locking and unlocking bar associated with at least one lock unit and a locking and unlocking pawl connected to such bar can be angularly rotated by depressing, in a proper order, pushbuttons of a number r out of a total number n, whereby anybody can operate from outside a dead bolt in a manner to withdraw the same from the mortise. The locking and unlocking pawl is held in engagement within a cutout formed in a control slider fitted in a stem portion of the dead bolt and also in a plurality cutouts formed in the stem portion of the dead bolt and having a larger width than the cutout formed in the control slider. The control slider can be operated by turning a grip. The dead bolt itself can be operated from inside the room irrespective of the position where the locking and unlocking pawl is disposed. The dead bolt can be fitted into a mortise and the lock units can be reset by the reciprocating motion of a lever operated by turning a knob.
REFERENCES:
patent: 1092733 (1914-04-01), McCarthy
patent: 1401030 (1921-12-01), Ashkar
patent: 1513904 (1924-11-01), Hill
patent: 1538479 (1925-05-01), Fleury
patent: 2997872 (1961-08-01), Fry
patent: 3009346 (1961-11-01), Check
patent: 3667261 (1972-06-01), McGourty
patent: 3808852 (1974-05-01), Mohrhauser
patent: 3910078 (1975-10-01), Shulz
Nakamura Hisako
Nakamura Katori
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