A lifter includes a pinion gear meshed with an input gear of a link mechanism that lifts and lowers a seat. A rotation control device that controls rotation of the pinion gear includes a rotation restriction mechanism. The rotation restriction mechanism includes a sub-meshing member which meshes with a meshed member together with a main meshing member. The sub-meshing member is displaceable to gradually release the meshing of the sub-meshing member with the meshed member when the meshing between the meshed member and the main meshing member is released.

A seat adjuster having a fixed part (12), a drive element (26), an output element (22, 24), a clamping body coupling arrangement (16) by means of which a back and forth movement of the drive element (22, 24) out of a neutral position and back into the neutral position is converted into a continued movement of the output element (22, 24) in a uniform direction of rotation, and a releasable locking device for locking the output element (22) in a form-fitting manner on the fixed part (12), characterized in that the locking device is formed by a locking ring (74) which is axially displaceable between a locking position, in which it is non-rotatably coupled to the output element (22), and a release position, and cam surfaces (82, 84) are formed on the locking ring (74) and the drive element (26), which cam surfaces are complementary to one another and translate a rotation of the drive element (26) away from the neutral position into an axial movement of the locking ring (74) into the released position.

A clutch unit that is used for a vehicle seat includes: a housing, which accommodates at least one of a input-side clutch and a output-side clutch, a first engaging portion, which is rotatable integrally with an output shaft member, and a lock member, which is able to be shifted between a locked state, in which the rotation of the output shaft member relative to the housing is suppressed by the lock member being locked to the first engaging portion, and an unlocked state, in which the rotation of the output shaft member relative to the housing is allowed by releasing the engaging with the first engaging portion, wherein when the lock member is shifted from the locked state to the unlocked state, the lock member is elastically deformed to release the engagement of the lock member and the first engaging portion.

A lifter device including: an input member configured to be rotated about a rotation shaft in synchronization with an operation handle and to input an operation force of the operation handle to a rotation drive mechanism and a lock mechanism; and a fixing member slidably fixing the input member to a support member rotatably supporting the rotation shaft.

An adjustment device, in particular for adjusting motor vehicle seats, has: a) a rotatably mounted drive element; b) a rotatably mounted output element; c) a first sprag freewheel, by means of which the output element can be blocked steplessly in different positions in both adjustment directions, and which can be released via a release element; d) a second sprag freewheel, which is coupled to the first sprag freewheel via the release element and by means of which the output element can be blocked steplessly in different positions in both adjustment directions; e) an actuating element for releasing the second sprag freewheel; and f) an additional locking means for securing the first sprag freewheel against rotation with at least one rotatably mounted locking lever.

An adjustment assembly or mechanism that permits adjustment of the height and angle of tilt of a vehicle seat includes front and rear latch gears with multiple cogs corresponding to discrete angular positions of the latch gears and consequently discrete heights of the front and rear of the adjustment assembly. The front latch gears pivot about a fixed pivot axis while the rear latch gears pivot about a sliding pivot axis to accommodate tilt angles for the seat. Torsion springs bias the four latch gears to a maximum rotation or pivot position in which the respective ends of the seat are at their highest vertical position. A spindle engages the cogs of the latch gears to hold the latch gears in a particular discrete angular position. Separate front and rear manual actuation levers at the front of the seat can be lifted to release a respective front and rear spindle from a particular cog and allow the driver to adjust the seat position. The independent front and rear adjustment mechanisms allow the driver to place the seat in a wide range of heights and tilt angles, including forward and rearward tilt angles.

A seat adjuster, includes a brake acting between fixed and adjustable parts so the adjustable part is blockable in positions on the fixed part and releasable by a release element, an adjustment element acting on the release element, selectively adjusting the adjustable part in two opposite directions, and a locking element automatically engaging and interlockingly locking the adjustable part to the fixed part when the adjustment element is not actuated and automatically disengaging when the adjustment element is actuated, disengagement of the locking element and adjustment of the adjustable part being effected by moving the adjustment element out of neutral position, the locking element having a toothed segment for meshing with a toothed ring coupled to the adjustable part so the locking element is movable in the radial direction of the toothed ring between locking and release positions, in which the locking element meshes with or moves away from the toothed ring.

A lifter device, wherein a pawl operating member is configured to be rotatable with respect to a rotation shaft so as to rotate in accordance with an operation of an operation handle and includes a first projection protrudingly formed on its outer peripheral side for rotational alignment, wherein a support member includes a second projection which is protrudingly formed so as to face the first projection and which serves as a reference position of a pawl operating member in a rotational direction, and wherein, in a state where the operation handle is not operated, a second spring is configured to bias the first projection so as to overlap with the second projection in the rotational direction of the pawl operating member.

A clutch unit (100) includes an operation lever (21), an operation member (22), an input-side clutch (50), an output-side clutch (60), and a bottomed cylindrical housing (11). The input-side clutch (50) includes an input-side inner ring member (51) and an operation bracket (54). The operation bracket (54) includes an engagement portion (54b) that engages with the input-side inner ring member (51), a facing portion (54d) that faces the bottom surface (11 a) of the housing (11) with a gap therebetween, a fastened portion (54c) that penetrates a through hole (11h) formed in the bottom surface (11a) of the housing (11) and is fastened to the operation member (22), and a sliding-contact portion (54e) that extends from the facing portion (54d) toward the bottom surface (11a) of the housing (11) and comes into sliding-contact with the bottom surface of the housing (11).

A clutch unit includes: an input-side transmission member provided to move from an initial position toward a tip of the wedge-shaped space, and an inside tangential line is a tangential line at a contact point of the input-side transmission member and the input-side inner ring member, an outside tangential line is a tangential line at a contact point of the input-side transmission member and the input-side outer ring member, and a segment connects a rotational center of the input-side transmission member with an intersection point between the inside tangential line and the outside tangential line, wherein a wedge angle is an acute angle defined by the segment and the inside tangential line, and a stopper projection is provided at a tip-side position, and a wedge angle formed by the stopper projection is larger than an initial wedge angle at the initial position.