Door key retention security system

Details Door key retention security system Door key retention security system

2006-05-30

2006-05-30

Feild, Lynn (Department: 2835)

Locks

Operating mechanism

Key

C070S390000, C307S116000

Reexamination Certificate

active

07051563

ABSTRACT:
This Door Key Retention Security System guarantees that a key used to enable operation of a powered door is retained or locked in the invention until the door is, once again, closed. Thus, it requires a person who has authorized access to the key to insert the key and properly turn it in order for a door to be opened. Then, while the door is open, the key is locked in the mechanism and cannot be removed. When the need for the door to be open is ended, the door can be closed and the key removed.

REFERENCES:
patent: 3906762 (1975-09-01), Austin et al.
patent: 4074462 (1978-02-01), McHeffey
patent: 4120184 (1978-10-01), Gerlach
patent: 4300374 (1981-11-01), Mullich et al.
patent: 5237843 (1993-08-01), Charbonneau et al.
patent: 5970761 (1999-10-01), Eden, Jr.
patent: 2001/0039819 (2001-11-01), McCurry
patent: 2 388 154 (2003-05-01), None

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