Seat slide rail device

A seat slide rail structure, comprising:

• a lower rail having a channel member with a substantially C-shaped cross-section fixedly attached to a floor surface and having an open side end;
• a slider, fixedly secured to a seat, having a vertical portion opposing the open side end of the lower rail and combined with the lower rail in an axially slidable manner by way of a bearing member;
• and a lock member rotatably supported by a lock shaft which is in turn supported by the slider, further comprising:
• the bearing member being fixedly secured to the slider and positioned inside the lower rail;
• the lock lever shaft positioned inside the lower rail and rotatably supported on the slider by the bearing member;
• a lower member depending from a lower portion of 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;
• the slide position of the seat being adjustable by selective engagement of a lock tooth formed at a free end of the lock member and adapted to be actuated by an actuating means into and out of a plurality of lock holes provided in the lower rail.

A seat slide rail device, comprising:

• a pair of seat slide rail structures, arranged in mutually parallel relationship between a seat and a floor along a fore-and-aft direction, each comprising a lower rail having a channel member with a substantially C-shaped cross-section fixedly attached to a floor surface and having an open side end;
• a slider, fixedly secured to a seat, having a vertical portion opposing the open side end of the lower rail and combined with the lower rail in axially slidable manner by way of a bearing member;
• and a lock member rotatably supported by the slider by way of a lock shaft and adapted to be rotated by an actuating means, the lock shaft of the first seat slide rail structure consisting of a lock lever shaft which may be manually rotated and to which the lock member having at least one lock tooth at its free end is fixedly secured the bearing member being fixedly secured to the slider and positioned inside the lower rail;
• the lock lever shaft positioned inside the lower rail and rotatably supported on the slider by the bearing member;
• the lock shaft of the second seat slide rail structure consisting of a lock shaft rotatably supporting the lock member having at least one lock tooth at its free end so that the lock member of the second seat slide rail structure may be actuated in synchronization with the lock member of the first seat slide rail structure by way of a displacement transmitting means;
• so that the slide position of the seat may be adjustable by selective engagement of the lock tooth formed in the free end of the lock member with the lock holes provided in the lower rail in each of the seat slide rail structures, wherein:
• the lock tooth of the second seat slide rail structure is provided with a greater taper than the lock tooth of the first seat slide rail structure.