US 4,543,514 AGranted

Central locking system for motor vehicles

AssigneeFichtel & Sachs AG

InventorRainer Fey

Life of this patent

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Abstract

The central locking system for motor vehicles comprises a plurality of catch drives reversibly driving between a locking position and an unlocking position. The catch drives are switched on for a pre-determined time duration in the locking direction by drive signals of a first time control circuit. The catch drives are energized in the unlocking direction by a second time control circuit for a pre-determined time duration. The time control circuits can be triggered alternately through a triggering control switch actuatable by means of a door key from outside the vehicle, or by means of a press-button switch actuatable from within the motor vehicle. The trigger inputs of the time control circuits are connected through separate trigger paths to the press-button switch.

Claims12

Dependent claims

In a central locking system for motor vehicles in which the ignition and/or a starter can be switched on and off by means of a control switch operable by means of a key, said system having a plurality of catch drives reversibly driving between a locking position and an unlocking position, a first time control means which on triggering supplies first drive signals for a predetermined time duration to the catch drives which drive the catch drives in the direction towards the locking position, a second time control means which on triggering supplies second drive signals for a predetermined time duration to the catch drives which drive the catch drives in the direction towards the unlocking position, and at least one triggering control switch operable from outside the motor vehicle by means of a key, which switch in a first switch position triggers the first time control means and in a second switch position triggers the second time control means, the provision of

(a) at least one common press-button control switch for operation within the motor vehicle;
(b) trigger paths for respective connection of the first and second time control means to said common press-button switch, said trigger path connecting the press-button control switch with the first time control means being triggerable independently of the switch position of the control switch and comprising:
a first gate circuit responding to the drive position of the catch drives which blocks the trigger path when the catch drives are in the locking position, and enables the first time control means to be triggered by the press-button control switch when the catch drives are in the unlocking position,
said trigger path connecting the press-button control switch with the second time control means comprising:
a second gate circuit controllable through the control switch which blocks the trigger path when the control switch is switched off and enables the second time control means to be triggered by the press-button control switch when the control switch is switched off;
and
(c) a blocking circuit responding to the drive signals of the first time control means for blocking the drive signals of the second time control means during the occurrence of the drive signals of the first time control means.

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Dependencies are inferred from the claim text.

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Abstract

(a) at least one common press-button control switch for operation within the motor vehicle;
(b) trigger paths for respective connection of the first and second time control means to said common press-button switch, said trigger path connecting the press-button control switch with the first time control means being triggerable independently of the switch position of the control switch and comprising:
a first gate circuit responding to the drive position of the catch drives which blocks the trigger path when the catch drives are in the locking position, and enables the first time control means to be triggered by the press-button control switch when the catch drives are in the unlocking position,
said trigger path connecting the press-button control switch with the second time control means comprising:
a second gate circuit controllable through the control switch which blocks the trigger path when the control switch is switched off and enables the second time control means to be triggered by the press-button control switch when the control switch is switched off;
and
(c) a blocking circuit responding to the drive signals of the first time control means for blocking the drive signals of the second time control means during the occurrence of the drive signals of the first time control means.

4 more elements