Patent ID: 8388030

Claim:
A door latch device in a door of a motor vehicle, comprising: an engagement portion, comprising: a latch which engages with a striker of a vehicle body of the motor vehicle; a ratchet which engages with the latch; and an opening lever which can rotate with the ratchet; at least one lock lever moving between an unlocking position where the latch can be disengaged from the striker and a locked position where the latch cannot be disengaged from the striker with a lock knob on the door inside the vehicle; a first subsidiary lever connected to the lock lever to move between an unlocking position where the latch can be disengaged from the striker with an outside handle on the door outside the vehicle or with the inside handle and a locked position where the latch cannot be disengaged from the striker; a second subsidiary lever connected to the first subsidiary lever, the second subsidiary lever having a releasing-contact portion which comes in contact with the opening lever of the engagement portion when the second subsidiary lever is in the unlocking position, while the releasing-contact portion does not come in contact with the opening lever when the second subsidiary lever is in the locked position; a first inner lever connected to an inside handle on the door inside the vehicle and pivotally mounted on a pivot shaft; a second inner lever pivotally mounted on the pivot shaft; a childproof lock lever connected to the first and second inner levers to move between a childproof unlock position where the inside handle moves the second subsidiary lever via the first and second inner levers to release the latch from the striker and a childproof lock position where the inside handle does not move the second subsidiary lever via the first and second inner levers; a childproof-double-lock motor; and a single actuating member driven by the childproof-double-lock motor to move the childproof lock lever between the childproof unlock position and the childproof lock position, the actuating member moving among a first position, a second position and a third position, the first position of the actuating member moving the childproof lock lever to the childproof unlock position, the second position of the actuating member moving the childproof lock lever to the childproof lock position, the third position of the actuating member holding the subsidiary lever in the locked position.