Pin-tumbler lock with retained key and method of operation there

Details Pin-tumbler lock with retained key and method of operation there Pin-tumbler lock with retained key and method of operation there

1993-04-14

1994-11-08

Cuomo, Peter M.

Locks

Operating mechanism

Key

70419, E05B 1100

Patent

active

053616146

ABSTRACT:
A pin-tumbler lock and method of use thereof has an inside cylinder and conventional outside cylinder. The inside cylinder operates with a pin-tumbler key but cannot be operated by the key that operates the outside cylinder. The pin-tumbler key is retained automatically in the inside cylinder once inserted but can be manually released by using an appropriate tool. The inside cylinder retains the pin-tumbler key because the pins become misaligned when the pin-tumbler key is inserted. Previous locks can be a fire hazard or can be burglarized too easily.

REFERENCES:
patent: 3575024 (1971-04-01), Schlage
patent: 3633394 (1972-01-01), Pieck
patent: 3729964 (1973-05-01), Hsu
patent: 4120184 (1978-10-01), Gerlach
patent: 4228669 (1980-10-01), Bischoff
patent: 4300374 (1981-11-01), Mullich et al.
patent: 4315420 (1982-02-01), Oliver
patent: 4369642 (1983-01-01), Grell
patent: 4376381 (1983-03-01), Muus
patent: 4631941 (1986-12-01), Sjunnesson

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