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.

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.