Lock structure for seat slide device

摘要

A lock structure for a seat slide device for a vehicle seat having a first and a second rail which are parallel to each other and mutually slidable, and in particular to such a lock device which can lock up at any slide position. This can be accomplished by varying the pitch of the lock holes and the lock teeth from each other as opposed to the case of conventional lock structures in which lock teeth and lock holes are provided at the same pitch. The various approaches proposed by the present application include the use of the principle of a vernier caliper, varying the phase relationship of the lock teeth relative to the lock holes, and using evenly spaced lock teeth in combination with lock holes provided at a pitch which is a multiple of the pitch of the lock teeth. Since the seat slide device can lock up at any arbitrary slide position, not only the adjustment of seat slide position is facilitated but also secure locking will be assured when it is used in a slave seat slide device which is to be actuated at the same time as a master seat device without unduly increasing the rigidity of the general seat support structure.