US 4,070,881 AGranted

Pushbutton operated door locks

OwnerJunichi Shimonoinventor

Life of this patent

Estimating the term…

Loading patent…

Abstract

Disclosed is a pushbutton operated door lock particularly featured by easy selection and changeability of a code number inputted into the door lock for its unlocking operation. The door lock includes a plurality of tumbler rings rotatably supported on a lock shaft in a casing. A lock bolt having a plurality of notches along its length is slidably supported on the lock shaft. Each of the tumbler rings is formed with a plurality of lateral bores. An engage pin is reciprocatorily movably received in each lateral bore of each tumbler ring. A plurality of pushbuttons are each connected with one of the tumbler rings to rotate them individually. Other pushbuttons are operationally associated with the tumbler rings to rotate all of them simultaneously. The tumbler rings are engageable with the notches on the lock bolt when they are rotated. A wall portion of the casing is formed therethrough with a plurality of apertures through each of which a pusher rod can be inserted to work on the engage pin in the corresponding one of the lateral bores of one of the tumbler rings for the reciprocatory movement of the engage pin.

Claims6

Dependent claims

A pushbutton operated door lock comprising:

a casing having a wall;
a lock shaft in said casing;
a lock bolt slidably supported on said lock shaft and having a plurality of notches juxtaposed along the length of said lock bolt;
a plurality of tumbler rings rotatably supported on said lock shaft and juxtaposed along the length thereof, each of said tumbler rings having an outer peripheral edge formed with a plurality of lateral bores;
a plurality of engage pins each having one end received in one of said lateral bores of each of said tumbler rings and reciprocatorily movable along said one lateral bore for restricting an angle of rotation of said each tumbler ring;
a plurality of first pushbuttons on said casing adapted to rotate said tumbler rings individually;
a plurality of second pushbuttons on said casing adapted to rotate said tumbler rings simultaneously;
said wall of said casing having a portion formed therethrough with a plurality of apertures each providing access to said engage pin in any of said lateral bores of one of said tumbler rings for the reciprocatory movement of said engage pin for restricting said angle of rotation of said tumbler ring on the outside of said casing;
and
each of said notches being engageable with one of said tumbler rings upon rotation of said one tumbler ring.

7 more elements

Dependencies are inferred from the claim text.