Patent ID: 8744070

Claim:
A user device, comprising: a main body part, a movable part electrically connected to the main body part, and a switching control unit and a rotation driver unit for co-axially connecting the main body part and the movable part, wherein: the switching control unit is configured to eliminate a friction that fixes the main body part relative to the movable part, subject to an external force, to turn on the rotation mode of the movable part the rotation driver unit is configured to apply a pre-pressing elastic force to the movable part when the switching control unit turns on the rotation mode of the movable part, to rotate the movable part relative to the main body part; the pre-pressing elastic force is less than the friction; the switching control unit comprises a switching element and an arrester element, wherein the arrester element comprises a pair of cam and recessed wheel that are tightly mated with each other; the cam is fixed to one of the main body part and the movable part directly or is fixed to one of the main body part and the movable part through other physical structure; the recessed wheel is fixed onto a first fixation axle, one end of the first fixation axle passes through the cam and contacts with the switching element exposed outside of the main body part, and another end of the first fixation axle passes through a first spring and is fixed onto another one of the main body part and the movable part directly or is fixed onto another one of the main body part and the movable part through other physical structure; the rotation driver unit comprises a second spring, wherein two ends of the second spring are respectively fixed onto the main body part and the movable part directly or through other physical structures; a first mounting hole and a second mounting hole are disposed on two sides of the movable part, a first accommodation part is disposed at location on the main body part corresponding to the first mounting hole and a second accommodation part is disposed at location on the main body part corresponding to the second mounting hole; and the switching control unit and the rotation driver unit are disposed on the same side of the main body part, the rotation driver unit is connected to the first accommodation part, the switching control unit is connected to the first mounting hole, and the switching control unit is connected to the rotation driver unit, and the second mounting hole and the second accommodation part are used for passing through and installing a cable.