Abstract: A door checker which can be advantageously utilized for driving automotive equipment such as a seat belt reacher system in synchronization with the opening and closing action of the vehicle door. By appropriate arrangement of a spring and a taper in the door checker member, the force required to open and close the door is not unduly increased. By proper arrangement of the spring, the side thrust from the door checker member is always directed in one direction, whereby the structure for supporting the side thrust is simplified.

Abstract: A seat slide rail structure comprising a lower rail having a channel member with a C-shaped cross-section fixedly attached to a floor and having an open side end; a slider, fixedly secured to a seat, having a vertical portion opposing the open side end and combined with the lower rail in axially slidable manner; a lock member rotatably supported by the slider and adapted to be rotated by actuating means; a lower member depending from the lower rail; and a slider extension bent from a lower end of the slider so as to oppose both surfaces of the lower member may engage each other even when a high lateral load is applied to the seat slide rail structure.

Abstract: 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.