An eccentricity prevention apparatus for a pumping device is configured to prevent the eccentric movement of rotating parts operating for moving a seat up and down. The eccentricity prevention apparatus includes: a clutch device provided inside a housing; and an elastic member providing an elastic restoring force to the clutch device in a direction compensating for eccentric movement of the clutch device tilted relative to a rotating axis thereof.

A pumping device for a seat of a vehicle, in which a cam supporter supports a clutch cam to be balanced in the pumping device, thereby minimizing movement of the clutch cam due to an external force reversely input, and the cam supporter guides movements of brake rollers, thereby causing braking operation by the brake rollers to be precisely performed and improving operating performance.

An adjustment assembly for a motor vehicle seat, comprising an adjustment mechanism and a flange that is part of a seat frame, the adjustment mechanism comprising: a housing, itself comprising a bottom and a cover, an output member having a base, an end opposite the base, and a pinion between the base and the end, the pinion being mounted to pivot about an axis of rotation, a backplate, comprising a base plate fixed to the flange and an upper part intended to partially receive the output member, a pumping mechanism housed in the housing and configured to drive the pinion in rotation, the output member being in contact in the flange and in the upper part, the flange and the upper part allowing rotation of the output member about the axis of rotation.

An electric seat and an angle adjustment device thereof are provided. The angle adjustment device includes an inner toothed plate and an outer toothed plate engaging with each other, and an eccentric cavity formed therebetween. An eccentric ring completely occupying a positive eccentric region of the eccentric cavity is provided in the eccentric cavity. The eccentric ring has a first accommodating region and a second accommodating region along a circumferential direction. The angle adjustment device further comprises a driving component for driving rotation of the eccentric ring. A damping component is provided in the first accommodating region and/or the second accommodating region, and the damping component is in a compressed state during operation of the driving component. The damping component eliminates a useless stroke in the above operation, thereby eliminating an adjustment lag experienced by a passenger during reverse adjustment of a seat and backrest.

A vehicle seat lifting apparatus includes: a cushion base of a vehicle seat; a link member rotatably provided on the cushion base and raising and lowering at least a part of the vehicle seat; a front limiter provided on a front portion in front of a rotation center of the link member and limiting rotation of the link member; and a rear limiter provided on a rear portion behind the rotation center of the link member and limiting the rotation of the link member.

Adjustable height limiter for a vehicle seat, comprising: a main body with a slot having a first end and a second end, a piston rod element which is displaceable with respect to the main body and has a pin element which is guided in the slot, a sleeve element which is rotatable with respect to the main body and at least partially surrounds the main body, the sleeve element having a boundary which is helical with respect to the main body, the boundary being arranged between the first end and the second end when viewed in the extension direction of the slot, and the pin element being arranged between the first end and the boundary.

A lifter device includes a pinion gear and a rotation control device that is configured to control rotation of the pinion gear. The rotation control device includes a rotation shaft, a support member, a rotation driving mechanism, and a lock mechanism. The rotation drive mechanism includes a feed gear, and a plurality of feed pawls. The lock mechanism is configured to release locking of the rotation shaft until any one of the feed pawls meshes with the feed gear when an operation handle is operated. A plurality of the feed pawls are provided with respect to either operation direction on a seat lifting side or lowering side of the operation handle, and one of the feed pawls meshes with the feed gear when at least one of the others of the feed pawls does not mesh with the gear.

Pawls in a lifter device, having: outer teeth that are rotatably supported by shafts for in lock plates and are meshed with inner teeth of a base; and pins that are provided in an intermediate section in the radial direction, between the shaft center of the shafts and the teeth tips of the inner teeth, and are pressed in the rotation direction by a rotation transmittance plate during a release operation. The pins have a protruding shape that protrudes from the pawls in the thrust direction.

A pumping device for a seat of a vehicle is proposed. In the pumping device, a plurality of pressure members is provided along an outer circumferential surface of a brake drum, and braking operation is performed through the pressure members moved when the brake drum rotates, so that friction between the brake drum and a housing can be avoided and thus deterioration of operational performance is prevented. In addition, the shape of the brake drum is simplified and the number of components is reduced, so that weight and size of the pumping device, and production cost are reduced, and fuel efficiency increases.

Disclosed is a pumping device for a seat of a vehicle, the device including: a cam mechanism rotating along with a lever; a clutch mechanism receiving power from the cam mechanism; a housing accommodating the cam mechanism and the clutch mechanism therein; a brake mechanism accommodated in the housing to receive power from the clutch mechanism, and configured such that boss portions protrude along an outer circumferential surface thereof, outer end sides of the boss portions face an inner circumferential surface of the housing, and a pressing portion protruding from the clutch mechanism is disposed between a boss portion and a neighboring boss portion; and a brake roller provided at opposite sides of each of the boss portions of the brake mechanism to be disposed between the boss portion and the pressing portion.