| 摘要 |
<p>PURPOSE: To shorten a lock unlocking operation time by a method wherein at a closing stage, a latch is moved from a free movement position to an unlocking preparation position. CONSTITUTION: During door locking, a rotating trap 3 is moved to a start position 13 through a bolt support 12. A return detent 4 is operated togetherwith an unlocking lever 6 by an operation lever 5 and operated by a locking unlocking assist mechanism exerting on a swing arm 7 and a drive part therefor. When a door latch is released by an external operation lever 5a, the levers 5a and 5b are fixed in notches 16 and 16b. A free movement type latch 19 is worked alternately on a rest stage 23 of the lever 5b by the lever arm 19a and on a link pin 24 of an unlocking lever 18 by a lever arm 19b. Further, during locking of a door, the latch 19 is driven by the locking unlocking assist mechanism at the locking stage and moved from a free movement position 27 to an unlocking preparation position 28. This constitution unlocks a door lock only by a single drive part without an idling time.</p> |
