Key cylinder device

Details Key cylinder device Key cylinder device

1992-07-31

1994-05-03

Cuomo, Peter M.

Locks

Operating mechanism

Key

70276, 70408, E05B 1722

Patent

active

053076583

ABSTRACT:
An object of this invention is to provide a key cylinder device which is simple in structure and is able to positively detect the presence or absence of the key. In a key cylinder device, a key cylinder body incorporates a rotor having a key inserting inlet, and a shutter made of a magnetic material is swingably mounted in the rotor to open and close the key inserting inlet, the shutter being urged by a spring to close the key inserting inlet. When the shutter is held closed, the magnetic force of a permanent magnet acts on a normally closed lead switch to hold the switch open. When the shutter is swung open by the key being inserted into the key inserting inlet, it covers the permanent magnet, thus interrupting the action of the magnetic force of the permanent magnet on the lead switch. As a result, the reed switch closes.

REFERENCES:
patent: 3660624 (1972-05-01), Bell
patent: 4594866 (1986-06-01), Neyret
patent: 4868409 (1989-09-01), Tanaka et al.
patent: 4916927 (1990-04-01), O'Connell et al.
patent: 4918955 (1990-04-01), Kimura et al.
patent: 5003801 (1991-04-01), Stinar et al.
patent: 5117097 (1992-05-01), Kimura et al.

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