Locks – Operating mechanism – Combination
Patent
1977-07-05
1982-09-21
Holko, Thomas J.
Locks
Operating mechanism
Combination
E05B 3702, E05B 3716
Patent
active
043500315
ABSTRACT:
This invention relates to a pushbutton operated door lock particularly featured in that a number inputted for the unlocking operation can be very easily selected and changed on the inside of the door. The door lock includes a multiplicity of tumbler rings rotatably supported on a lock shaft with a lock bolt in a casing. The lock bolt has a multiplicity of notches engaging with the respective tumbler rings and is slidably supported along the lock shaft. Each tumbler ring is formed in its peripheral portion with a plurality of lateral bores in each of which an engage pin for restricting the angle of rotation is received for movement into and out of the lateral bore. Pushbuttons engageable with the respective tumbler rings to rotate them individually are associated with pushbuttons for rotating all the tumbler rings together, so that a selected number of tumbler rings are engaged with, or disengaged from the notches on the lock bolt upon rotation of the tumbler rings. The rear face of the casing on the inside of the door is formed with apertures for insertion of guide rods to move the engage pins inwardly or outwardly relative to the tumbler rings, whereby the angle of rotation of the tumbler rings within the casing can be easily restricted from the outside of the casing to permit free and very easy selection and change of the function of the pushbuttons, namely, the number for the unlocking operation from the inside of the door.
REFERENCES:
patent: 200070 (1878-02-01), Loch
patent: 745081 (1903-11-01), Smith
patent: 1144887 (1915-06-01), Besharov
patent: 1156741 (1915-10-01), Besharov
patent: 2856765 (1958-10-01), Sreb
patent: 3379040 (1968-04-01), Shimono
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