Door lock device with anti-theft mechanism

A door locking device having an anti-theft mechanism, comprising:

• a locking lever connected to an inside lock button of a door and being displaceable between a locking position and an unlocking position;
• an anti-theft member being displaceable between an anti-theft position for disabling an unlocking operation of the inside lock button and an anti-theft canceling position for enabling the unlocking operation of the inside lock button;
• motor means for moving the locking lever into the locking position by a normal rotation thereof in a predetermined amount, moving the anti-theft member into the anti-theft position by a continuous normal rotation thereof over the predetermined amount for moving the locking lever into the locking position, and returning the anti-theft member to the anti-theft canceling position by a reverse rotation thereof;
• controller means having a locking operation for changing the locking lever into the locking position by using the motor, an anti-theft operation for changing the anti-theft member into the anti-theft position by using the motor, and an anti-theft canceling operation for changing the anti-theft member into the anti-theft canceling position by using the motor;
• and
• voltage changing circuit means for supplying power having different voltages to the motor means under control of the controller means;
• wherein the controller means sets a voltage to be supplied to the motor means when performing the locking operation, as being lower than a voltage to be supplied to the motor means when performing the anti-theft operation;
• wherein the controller means regulates the voltage to be supplied to the motor means when performing the locking operation so that it does not unintentionally displace the anti-theft position.

A door lock device having an anti-theft mechanism, comprising:

• a locking lever connected to an inside lock button of a door and being displaceable between a locking position and an unlocking position;
• an anti-theft member being displaceable between an anti-theft position for disabling an unlocking operation of the inside lock button and an anti-theft canceling position for enabling the unlocking operation of the inside lock button;
• motor means for moving the locking lever into the locking position by a normal rotation thereof in a predetermined amount, moving the anti-theft member into the anti-theft position by a continuous normal rotation thereof over the predetermined amount for moving the locking lever into the locking position, and returning the anti-theft member to the anti-theft canceling position by a reverse rotation thereof;
• controller means having a locking operation for changing the locking lever into the locking position by using the motor, an anti-theft operation for changing the anti-theft member into the anti-theft position by using the motor, and an anti-theft canceling operation for changing the anti-theft member into the anti-theft canceling position by using the motor;
• and
• voltage changing circuit means for supplying power having different voltages to the motor means under control of the controller means;
• wherein the controller means has information representing an appropriate voltage range of voltages suitable for performing the operations, wherein if a voltage supplied from a battery of a vehicle is out of the appropriate voltage range, the voltage supplied to the motor means is regulated by the voltage changing circuit means so that the voltage to be supplied to the motor means when performing the locking operation is regulated so that it does not unintentionally displace the anti-theft member to the anti-theft position.