Abstract: A hinge includes a first frame, a second frame, a bolt, a gear, an adjusting nut, a spring component, a shield, and an engaging component, the first frame has two first clamping portions for clamping the gear, the second frame has two second clamping portions for clamping the two first clamping portions, the adjusting nut is screwed on the bolt and provides clamping force, an accommodating cavity is opened in the second frame, the engaging component is configured therein and engages with the gear, the engaging component disengages from the gear when a first sidewall thereof presses against a sidewall of the accommodating cavity, the gear is prevented from rotating when a second sidewall of the engaging component presses against another sidewall of the accommodating cavity, the spring component is configured between the second frame and the engaging component, and the shield shields the gear.

Abstract: A backrest translation mechanism includes a holder mounted on a sofa seat, a swing locating member, a backrest mount, a slider, and a positioning pin. The swing locating member has a first end pivoted on the holder, several locking slots with downward openings arranged at regular intervals along its length direction. The locking slots are adapted for engaging with and unidirectionally locking up the positioning pin, one side of each locking slots is provided with an inclined surface inclined towards an opposite direction of the first end. The slider is slidably set on the swing locating member and has a retaining slot and a limiting slot. The positioning pin is accepted by the retaining slot and the locking slot jointly, and the positioning pin is restricted to be out of the locking slot by the limiting slot. The mechanism has multiple using positions for adjusting the translation of the backrest.

Abstract: A lifting stand for adjusting headrest includes a linear drive device and a connecting link assembly. The connecting link assembly includes a first fastener, a second fastener, a first connecting link, a second connecting link, a third connecting link, and a fourth connecting link. The first and second links are pivotally connected to the first fastener, the other end of the first connecting link is pivotally connected to the third connecting link which is connected to the second fastener, and the second connecting link is pivotally connected to the fourth connecting link which is connected to the second fastener and the third connecting link. The linear drive device is connected to the first fastener, and its output end is connected to the third connecting link. The lifting stand can automatically adjust the position of the headrest and keep a nice appearance for sofas.

Abstract: A backrest translation mechanism includes a holder mounted on a sofa seat, a swing locating member, a backrest mount, a slider, and a positioning pin. The swing locating member has a first end pivoted on the holder, several locking slots with downward openings arranged at regular intervals along its length direction. The locking slots are adapted for engaging with and unidirectionally locked up the positioning pin, one side of each locking slots is provided with an inclined surface inclined towards an opposite direction of the first end. The slider is slidably set on the swing locating member and has a retaining slot and a limiting slot. The positioning pin is accepted by the retaining slot and the locking slot jointly, and the positioning pin is restricted to be out of the locking slot by the retaining slot. The mechanism has multiple using positions for adjusting the translation of the backrest.

Abstract: A hinge adjuster includes a first frame, at least one locking piece, at least one spring component, at least one second frame and a pair of cover. The first frame defines at least one locking hole including a first accommodating hole and a second accommodating hole. The locking piece is slidably placed in the first accommodating hole for engaging with the first accommodating hole or the engaging notch alternatively. At least one groove for engaging with the locking piece is configured on a pivoted portion of the second frame, which includes a flat portion, a dentiform portion, and an end portion. And the locking piece is protruded from the locking hole and contacting with the flat portion, the dentiform portion or the end portion selectively. The hinge adjuster has strong supporting capability and can achieve a cyclic adjustment of angles, and the operation is simple and convenient.