Abstract: The present invention provides a height adjuster for a seat of a vehicle capable of lowering equipment height in an accommodated state. A four-joint link mechanism 40a, 40b configuring the fourth layer are provided with a first arm 47 formed the first guide face 47d guiding a guide roller 35 formed on a third layer, a second arm 42 and a first reinforce member 43. The arms and the rear end of a first reinforce member is turnably pivoted to a first bearing 41 and the front end of a first reinforce member is turnably pivoted to a second bearing 48 by the shaft members 45 and 42h. Each link mechanism is lowered while depicting the trajectory that corresponds to the curve of the first guide face 47d and turning the front end. Because a first reinforce member 43 is provided. Although a portion at which the first guide face 47d of the first arm 47 is formed is smaller in thickness of a vertical direction than a portion at which the first guide face 47d is not formed.

Abstract: The present invention provides a height adjuster for a seat of a vehicle capable of lowering equipment height in an accommodated state. A four-joint link mechanism 40a, 40b configuring the fourth layer are provided with a first arm 47 formed the first guide face 47d guiding a guide roller 35 formed on a third layer, a second arm 42 and a first reinforce member 43. The arms and the rear end of a first reinforce member is turnably pivoted to a first bearing 41 and the front end of a first reinforce member is turnably pivoted to a second bearing 48 by the shaft members 45 and 42h. Each link mechanism is lowered while depicting the trajectory that corresponds to the curve of the first guide face 47d and turning the front end. Because a first reinforce member 43 is provided. Although a portion at which the first guide face 47d of the first arm 47 is formed is smaller in thickness of a vertical direction than a portion at which the first guide face 47d is not formed.

Abstract: A flat portion 12a and a slope portion 12b are provided on a thread 12 of a multi-pitch screw 10 alternately. The flat portion and the slope portion are provided on the thread of a multi-pitch nut which fastens with this. Consequently, a screw and a nut capable of preventing loosening securely by step are achieved. This enables comfortable and quick feeding and when a torque from a driving source is interrupted, step-like self-lock is activated.

Abstract: A simply structured and inexpensive seat slide apparatus, which, in an ordinary front/rear position adjustment of a seat, allows a passenger to operate manually without using a power drive unit; and in walk-in operation only, enables the seat to slide swiftly using the power drive unit.

Abstract: A flat portion 12a and a slope portion 12b are provided on a thread 12 of a multi-pitch screw 10 alternately. The flat portion and the slope portion are provided on the thread of a multi-pitch nut which fastens with this. Consequently, a screw and a nut capable of preventing loosening securely by step are achieved. This enables comfortable and quick feeding and when a torque from a driving source is interrupted, step-like self-lock is activated.

Abstract: Output reduced by a reduction mechanism A contained within a tube type motor body 5 is transmitted to a threaded shaft 13, and a nut 15 having a wing element 15a for transforming rotation of the threaded shaft 13 to propulsion is threadingly engaged with the threaded shaft 13. Then, reduction and boost is made between a linear groove 16a of a guide member 16 secured to an inner wall of the body 5 and the rotation is transmitted to the body 5 by this rotational force, thereby an arm 17 provided on the body 5 is swung so that a base 3 is adjusted upwardly and downwardly about bearing members 2, 2a mounted on slide rails 1, 1. Owing to this arrangement, since a smaller installation space can be achieved, the apparatus can be made small in size and commonly used for various types of automotive vehicles. Moreover, the apparatus can be unitized. In addition, a high torque transmission is made possible by reduction and boost.