A fluttering prevention apparatus for a lever of a pumping device includes: a lever bracket including a first side coupled with a lever, a center portion formed with a hollow hole, and a second side formed with insertion holes; a clutch cam including a first side provided with protruding portions inserted into the insertion holes of the lever bracket; a clutch drum having a first side formed with a seat groove to receive the clutch cam is seated therein; and a spindle coupled to the hollow hole of the lever bracket through center portions of the clutch drum, the clutch cam, and the housing, thereby inhibiting the lever bracket form fluttering with respect to the clutch drum.

A clutch unit includes a lever-side clutch portion for controlling transmission and interruption of rotational torque to an output side through lever operation, and a brake-side clutch portion for transmitting torque input from the lever-side clutch portion to the output side and for interrupting torque reversely input from the output side. The lever-side clutch portion has an outer centering spring provided between a lever-side outer ring to be rotated through the lever operation and a cover restricted in rotation, for accumulating an elastic force obtained by torque input from the lever-side outer ring and for restoring the lever-side outer ring to a neutral state with the accumulated elastic force through releasing of the torque input from the lever-side outer ring.

A vehicle seat (1) has an adjusting device (40) for adjusting a relative position between a first component (24) and a second component (30) of the vehicle seat (1). The adjusting device (40) has a locking device (50) for locking the adjusting device (40) by a friction fit between a brake ring (60) and at least one brake element (70) of the adjusting device (40). The brake ring (60) is directly connected to the first component (24) or directly connected to the second component (30).

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.

A clutch unit includes a lever-side clutch part that controls transmission and interruption of rotational torque input through a lever operation, and a brake-side clutch part that transmits the rotational torque from the lever-side clutch part to an output side, and interrupts rotational torque reversely input from the output side. The brake-side clutch part includes an outer ring, which is constrained in rotation, an output shaft that outputs the rotation, and a cylindrical roller that controls the interruption of the rotational torque reversely input from the output shaft and the transmission of the rotational torque input from the lever-side clutch part through engagement and disengagement between the outer ring and the output shaft. The output shaft includes a slide gear, which meshes with a side plate during interruption of the rotational torque and does not mesh with the side plate during transmission of the rotational torque.

A clutch unit includes a lever-side clutch part to control transmission of rotational torque input through a lever operation, and a brake-side clutch part to transmit the rotational torque from the lever-side clutch part to an output side, and interrupt rotational torque from the output side. The brake-side clutch part includes an outer ring constrained in rotation, an output shaft configured to output the rotation, a cage arranged between the outer ring and the output shaft to receive the rotational torque from the lever-side clutch part, and a cylindrical roller to control the interruption of the rotational torque from the output shaft and the transmission of the rotational torque input from the cage through engagement and disengagement between the outer ring and the output shaft.

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 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.

Disclosed is a seat pumping device for a vehicle. The seat pumping device includes: a housing; a return spring guide which is fixedly coupled to the housing and has an embedded return spring; a clutch cam which is rotatably accommodated in the housing; and a lever bracket which is partially accommodated in the return spring guide and coupled to the clutch cam so as to be rotated integrally with the clutch cam, in which the lever bracket is maintained spaced apart from the return spring guide by a separation support means, thereby improving operating characteristics of a lever handle.

Provided is a vehicle seat including a height device for moving up and down a seat body and being capable of suppressing a positional displacement of the height device. A vehicle seat includes a cushion frame serving as a framework of a seating portion, a height device for moving the cushion frame up and down, and a side cover that covers the cushion frame and the height device from the outsides thereof in the seat width direction. An operation lever and a brake unit, which serve as components of the height device, are disposed separated from each other. The operation lever is positioned to be engaged with a positioning member housed in an outer surface of the side cover.