Door unlocking device

Details Door unlocking device Door unlocking device

1992-07-17

1994-05-10

Gall, Lloyd A.

Locks

Special application

For automotive vehicles

70264, 70265, 70278, 70279, 70427, 70430, 307 101, 34082531, 361172, E05B 6520

Patent

active

053097432

ABSTRACT:
An object of this invention is to provide a door unlocking device adapted unlock a door by transmitting a signal in the air through a signal transmitter, which can unlock the door even when the power source of the signal transmitter, namely, the battery has consumed up. With a door unlocking device, upon insertion of an ignition key into the rotor of a key cylinder, a shutter is opened to operate a shutter switch. Under this condition, the rotor is turned in opposite directions from the neutral position according to a predetermined rotor turning pattern. The rotor turning pattern is discriminated by a rotor-turning-pattern discriminating circuit. Ensuring that the rotor turning pattern is the one predetermined for unlocking the door, the rotor-turning-pattern discriminating circuit activates an electric operating mechanism to cause a lock mechanism to unlock the door.

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patent: 5168733 (1992-12-01), Rathmann et al.
patent: 5220319 (1993-06-01), Kendel

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