Patent GB-1309268-A (GB)
Title: Door lock mechanism
IPC: E05B65/32
Filed: 1970-03-18
Abstract: 1309268 Latches AISIN SEIKI CO Ltd 18 March 1970 [18 March 1969] 13149/70 Heading E2A A door lock mechanism comprises a rotatably mounted latch member 16, Fig. 2, which is rotatable by a fixed striker 14, Fig. 10, a detent 24, Fig. 2, mounted on a pin 55 and which co-operates with the latch member 16 to provide a partially latching or fully latching condition, a release mechanism having a release position in which it can actuate the detent 24 to release the latch member from the partially latching or fully latching position, thus allowing the latch member to return to an unlatching position, locking means for moving the release mechanism away from its release position to prevent latch-release actuation of the detent 24, and a projection 22 of the latch member 16, which projection is, on rotation of the latch member from its unfastening position towards its latching position when the locking means has previously moved the release mechanism away from its release position, moves the release mechanism back to its release position. The release mechanism comprises a lever 44 which is mounted on a pin 46 and a plate 56 which is mounted on the pin 55. The locking means comprises a rocking plate 49. In use when the door is being closed, the striker 14 enters a groove 15 and urges a feed pawl 65, Fig. 4, of the latch member 16 so as to rotate the latter in an anti-clockwise direction against the action of a spring 23, Fig. 2. The detent 24, having been rotated in an anti-clockwise direction by a spring 60, Fig. 3, enters a tooth 27, Fig. 4, in the latch member 16. When the striker 14 advances further, the latch member 16 is again moved in an anti-clockwise direction until a tooth 28 therein receives the detent 24 as shown in Fig. 5. The striker 14, during its further advancement, engages an inclined surface 31 of a slide block 29 to move the latter against the action of a spring 32, an arm 63 of the striker 14 is urged upwardly against a wall of the groove 15 to take up play. Additionally the projection 22 rotates with the latch member 16 and the plate 56 rotates with the detent 24, the change of positions being shown by comparing Fig. 6 with Fig. 3, If a door of a vehicle, for example, is opened by an outside door handle (not shown), a lever 39 is turned clockwise about a pin 38, a connecting-bar 44 moves downwards until a lever end 54 engages an end 57 of the plate 56, the latter being rotated anti-clockwise against the action of the spring 60 and the detent 24 being rotated clockwise so that the second tooth 28 on the latching member 16 is released and the latter is moved clockwise by the spring 23 to the position shown in Fig. 2. When the door of a vehicle is fastened by a key, the rocking plate 49, Fig. 6, is rotated clockwise about a pin 48 so that the plate 49 is moved from the position in Fig. 6 to the position in Fig. 8, a pin 50, which is integral with the plate 49, moves in a slot 47 of the connecting bar 44, the latter being rotated in an anti-clockwise direction about a pin 46, and a spring 51 urges the plate 49 clockwise and the latter and the connecting bar 44 are in the position shown in Fig. 8. Thus a counter-clockwise movement of lever 39 and a movement of bar 44 brought about by a door-opening operation, will not bring lever end 54 into engagement with end 57 of opening plate 56. The latter will therefore not be caused to rotate in the counterwise direction and the latch member 16 is in engagement with the detent 24, the mechanism being in the completely latched position as shown in Fig. 5 and the door cannot be opened. If the door is locked from inside of the vehicle, closing of the door causes rotation of a latch member 16 so that projection 22 of the latch member moves from left to right along slot 61, Fig. 8. The projection 22 engages the bar 44 causing it to rotate about pin 46, the bar 44, being connected by pin 50 to the rocking plate 49, causes the latter to move counterclockwise to the position shown in Fig. 6, the spring 51 assisting the movement. In order to open the door the lever 39 is moved clockwise, the bar 44 being in a position to allow the bar end 54 to engage plate end 53 upon downward movement of the bar 44. In a keyless lock operation, the door is in its open position and a push button is operated from inside the vehicle, the rocking plate 49 being moved to the position shown in Fig. 8. The door is then closed with its handle in its dooropening position and the rotational movement of the lever 39 moves the bar 44 downwards. At this position, as shown in Fig. 7, the projection 22 cannot engage the bar 44 and the latter and the plate 49 retain their locking position even after the door is closed. Thus the door cannot be opened either from outside or inside the vehicle.