A neck injury is improved with a structure having a lifting mechanism part only on one side. While a lifting driving part is provided on a side of one side frame, a coupling driving rod is coupled to a rotation center of a drive gear a driving link is disposed on a side of the other side frame, and the driving link is coupled to the coupling driving rod. A driving force in the lifting driving part operates on the side of one side frame having the drive gear, but on the side of the other side frame, the driving link rotates together with the drive gear via the coupling driving rod, so as to perform a lifting or lowering operation. The shape of a virtual square coupling contact points of the driving link, the side connectors, the coupling driving rod, and the drive gear does not collapse, and thus an external input is dispersed.

The present invention relates to a transmission (1), in particular for an adjustment drive, comprising a housing (2), a worm shaft (3) which is rotatably mounted in the housing (2) and which can be driven, a worm wheel (4) which is rotatably mounted in the housing (2) and which meshes with the worm shaft (3), an encircling first wedge surface (5) which is formed on the worm wheel (4) or fixedly connected to the worm wheel (4), a brake element (6) which is arranged so as to be rotationally conjoint with respect to the worm wheel (4) and which has a second wedge surface (7), wherein the first wedge surface (5) bears areally against the second wedge surface (7).

Disclosed is a one-way damping structure, comprising a spring, a drive element and a friction force generation member, the spring and the drive element being connected such that the spring is driven by means of the drive element; the spring comprises a fixing portion, a connecting portion and an annular portion, the connecting portion being located between the fixing portion and the annular portion and connecting the fixing portion to the annular portion, and the fixing portion being fixed; and the annular portion comprises at least half a turn for defining a spring opening which spirally extends in the circumferential direction, and slides relative to the friction force generation member so as to generate friction torque. Also disclosed is an adjusting assembly and a seat height adjuster utilizing one-way damping properties in which the spring of the one-way damping structure generates different torques in different rotation directions.

The present disclosure provides a seat position adjustment apparatus with improved assemblability, wherein the assemblability is improved and the weight is reduced by individually modifying the shapes of a mounting part and a gear part and improving their coupling structure, the seat position adjustment apparatus including a driving unit including a motor in which a drive shaft is formed, a gear part, wherein a curved surface part extending along a direction of rotation about a first axis extending bilaterally is formed in an outer portion of the gear part, and the gear part is gear-coupled to the drive shaft, a rod part coupled to the gear part such that the rod part passes through the gear part, receives power from the drive shaft, and moves forward or rearward, and a mounting part, wherein upper portions of a curved plate structure surrounding the curved surface part at a front and a rear of the gear part, respectively, envelop the rod part to form respective through-holes each having a vertical length that is relatively greater than a vertical thickness of the rod part, wherein, in a state in which the mounting part is fixed, a seat connected to the rod part is moved in accordance with a movement of the rod part.