Key-operated lock

• US 3,230,749 A
• Filed: 12/03/1963
• Issued: 01/25/1966
• Est. Priority Date: 12/03/1963
• Status: Expired due to Term

• Current Assignee: William H. Mantborne
• Original Assignee: William H. Mantborne
• Inventors: Mantborne, William H.
• Application Number:
  US04/327,745
• Time in Patent Office: 784 Days
• US Class Current: 70/421
• CPC Class Codes: E05B 21/00 Locks with lamelliform tumblers which are not set by the insertion of the key and in which the tumblers do not follow the movement of the bolt e.g. Chubb-locks
• CPC Class Codes: Y10T 70/5111 Projectable bolt
• CPC Class Codes: Y10T 70/7548 Directly key engaged
• CPC Class Codes: Y10T 70/7944 Guard tumbler

Claims

1. IN A KEY-OPERATED LOCK OF THE TYPE HAVING A BOLT AND A PLURALITY OF TUMBLERS INDIVIDUALLY MOVABLE THROUGH DIFFERENT PREDETERMINED DISTANCES FROM THE NORMAL, BOLTRESTRAINING POSITIONS TO BOLT-RELEASING POSITION, AGAINST BIASING FORCES, BY CORRESPONDING PORTIONS OF A OPERATING KEY, THE IMPROVEMENT WHICH COMPRISES:

A MASTER TUMBLER MOUNTED ADJACENT TO THE OTHER TUMBLERS AND MOVABLE FROM NORMAL, BOLT-RESTRAINING POSITION TO BOLT-RELEASING POSITION BY THE KEY, SAID MASTER TUMBLER BEING SO PROPORTIONED AND POSITIONED THAT THE BOLT IS RESTRAINED AGAINST OPENING MOVEMENT