A rail assembly includes assembly includes a fixed carriage and a clamping system. The fixed carriage defines a receiving area and a rail at least partially supported within the receiving area. The rail is slidable along an axis relative to the receiving area. The clamping system applies a clamping force on the rail within the receiving area. A movable assembly may be supported on the rail such that the movable assembly is movable along the axis relative to the fixed carriage.

A system may include an adjustable headrest assembly. The adjustable headrest assembly may include a headrest center bracket, a left vertical side plate track, a left headrest side plate assembly including a left headrest side plate, a right vertical side plate track, and a right headrest side plate assembly including a right headrest side plate. The left headrest side plate may be configured to move up and down relative to the left vertical side plate track based on the engagement of the left headrest side plate assembly with the left vertical side plate track. The right headrest side plate may be configured to move up and down relative to the right vertical side plate track based on the engagement of the right headrest side plate assembly with the right vertical side plate track.

A system may include an adjustable headrest assembly. The adjustable headrest assembly may include a headrest center bracket, a left vertical side plate track, a left headrest side plate assembly including a left headrest side plate, a right vertical side plate track, and a right headrest side plate assembly including a right headrest side plate. The left headrest side plate may be configured to move up and down relative to the left vertical side plate track based on the engagement of the left headrest side plate assembly with the left vertical side plate track. The right headrest side plate may be configured to move up and down relative to the right vertical side plate track based on the engagement of the right headrest side plate assembly with the right vertical side plate track.

The present application discloses an adjustment assembly and a headrest. The adjustment assembly includes: a guiding rod; a fixing member, fixed to an end of the guiding rod; a driving portion, movably connected to the fixing member; and a first screw, engaged to the fixing member with threads, and the driving portion is connected to the fixing member by the first screw, wherein the driving portion includes a first motor, and the first motor is used to drive the driving portion to linearly move in respect to the fixing member along a direction close to or away from the fixing member. The adjustment assembly of the application can be adjusted electrically, such that the operation is convenient, and the structure is simple and reliable.

The present disclosure relates to an adjusting device for a headrest of a vehicle seat, the adjusting device comprising: a backrest fastening for attaching to a backrest, a holding device with a vertical adjustment means for adjusting the headrest in vertical direction, a longitudinal adjusting means for adjusting the holding device in a longitudinal direction, the longitudinal adjusting means comprising a four-joint gear provided between the backrest fastening and the holding device, the four-joint gear comprising two guiding arms.

Here, the longitudinal adjusting means comprises a spindle drive, the spindle drive being provided between the holding device and one of the guiding arms. The guiding arm is preferably a front guiding arm. A spindle of the spindle drive is preferably translationally displaceable and provided in an arc-shaped slot guiding of the guiding arm. Moreover, a vertical adjustment by a second spindle drive is provided.

A sliding sleeve (6, 60) for fixing in a securing support (5, 50). The sliding sleeve (6, 60) includes a sleeve body (6.2, 60.2) with a coupling section (6.3, 60.3) with at least one flexible coupling face (6.4, 60.4) for bearing against the securing body (5, 50).

An adjustable head restraint assembly for a seat back of a seat that includes a head supporting structure, a head rest support, and at least two of a height adjustment mechanism, a side angle adjustment mechanism, and a tilt adjustment mechanism that are each electronically powered. The head supporting structure is configured to support an occupant's head. The head rest support supports the head supporting structure. The height adjustment mechanism is configured to change the height of the head supporting structure relative to the head rest support and the seat back. The side angle adjustment mechanism is configured to change the angle of side portions of the head supporting structure relative to a center portion of the head supporting structure. The tilt adjustment mechanism is configured to change a tilt angle of the head supporting structure relative to a tilt supporting structure and the seat back.

An adjustable head restraint assembly for a seat back of a seat that includes a head supporting structure, a head rest support, and at least two of a height adjustment mechanism, a side angle adjustment mechanism, and a tilt adjustment mechanism that are each electronically powered. The head supporting structure is configured to support an occupant's head. The head rest support supports the head supporting structure. The height adjustment mechanism is configured to change the height of the head supporting structure relative to the head rest support and the seat back. The side angle adjustment mechanism is configured to change the angle of side portions of the head supporting structure relative to a center portion of the head supporting structure. The tilt adjustment mechanism is configured to change a tilt angle of the head supporting structure relative to a tilt supporting structure and the seat back.

The invention relates to seating furniture, in particular an armchair or sofa, with at least one backrest, at least one headrest, and at least one headrest adjustment. The headrest is held adjustable relative to the backrest by means of the headrest adjustment. The headrest adjustment has two height-adjustable positioning struts bearing the headrest and each is guided via a separate guide for adjusting the at least one headrest from the lower position into the upper position and back so that the headrests or the headrest adjustments are less prone to jamming or wedging, without disproportionate manufacturing costs. The guides each have a gear rack element and a gear wheel element meshing with the gear rack element when adjusting the headrest from the lower position to the upper position and back. The gear wheel elements are connected to one another in a torsion-resistant manner via a synchronous strut.

A sliding sleeve (6, 60) for fixing in a securing support (5, 50). The sliding sleeve (6, 60) includes a sleeve body (6.2, 60.2) with a coupling section (6.3, 60.3) with at least one flexible coupling face (6.4, 60.4) for bearing against the securing body (5, 50).