A steering-angle-limiting device of a steer-by-wire system selectively restricts turning of a steering wheel in a forward direction or in a reverse direction and permits turning of the steering wheel in order to inhibit locking of the steering wheel when the steering-angle-limiting device operates abnormally. Rotation of a stopping gear, which is coupled to a steering shaft, is selectively restricted depending on a change in a rotation angle of a cam, whereby the direction in which the steering wheel turns is selectively limited. In addition, when a stopper operates abnormally, the stopper is moved to a position apart from an end of the radius of rotation of the stopping gear, thereby enabling turning of the steering wheel.

A mechanical rotational-swinging adapter is provided to transfer a continuous rotational input from a driving tool into back-and-forth swinging output via a slotted cam structure. When the rotational-swinging adapter is installed between the nosecone and the air motor of a conventional dental handpiece, the nosecone outputs the back-and-forth swinging movement for dental work such as root canal or prophylaxis treatments.

A mechanical rotational-swinging adapter is provided to transfer a continuous rotational input from a driving tool into back-and-forth swinging output via a slotted cam structure. When the rotational-swinging adapter is installed between the nosecone and the air motor of a conventional dental handpiece, the nosecone outputs the back-and-forth swinging movement for dental work such as root canal or prophylaxis treatments.

A worm (40) according to an embodiment is a worm made of resin and formed by injection molding. The worm includes a gear portion (40a), a cavity (40c) having an axis being a longitudinal axis (40d) of the worm being formed at the gear portion, and a top portion (40b) formed at a first end portion of the gear portion in a direction of the longitudinal axis. A plurality of recesses (40e) including a hole portion communicating with the cavity are formed at the top portion in a radial direction, and are located on an outer peripheral portion side of the gear portion with respect to the cavity.

A worm (40) according to an embodiment is a worm made of resin and formed by injection molding. The worm includes a gear portion (40a), a cavity (40c) having an axis being a longitudinal axis (40d) of the worm being formed at the gear portion, and a top portion (40b) formed at a first end portion of the gear portion in a direction of the longitudinal axis. A plurality of recesses (40e) including a hole portion communicating with the cavity are formed at the top portion in a radial direction, and are located on an outer peripheral portion side of the gear portion with respect to the cavity.

Disclosed are a device for expansion and contraction through rotation of a rotary shaft and a VR headset. The device includes a first connecting housing, a second connecting housing, a third connecting housing, a connecting member and a positioning member. One end of the second connecting housing is rotatably connected to one end of the first connecting housing, and the third connecting housing is provided with a second inclined surface configured to fit a first inclined surface of the the second connecting housing. The connecting member is configured to fix the first connecting housing, the second connecting housing, and the third connecting housing. The positioning member is configured to control the second connecting housing and the third connecting housing to avoid deviation when the second connecting housing and the third connecting housing rotate relative to each other. The present application effectively improves the operating comfort for the user.

Disclosed are a device for expansion and contraction through rotation of a rotary shaft and a VR headset. The device includes a first connecting housing, a second connecting housing, a third connecting housing, a connecting member and a positioning member. One end of the second connecting housing is rotatably connected to one end of the first connecting housing, and the third connecting housing is provided with a second inclined surface configured to fit a first inclined surface of the the second connecting housing. The connecting member is configured to fix the first connecting housing, the second connecting housing, and the third connecting housing. The positioning member is configured to control the second connecting housing and the third connecting housing to avoid deviation when the second connecting housing and the third connecting housing rotate relative to each other. The present application effectively improves the operating comfort for the user.

An actuator for a rear view device of a vehicle, a rear view device and a vehicle with such an actuator includes a body defining a folding axis for a rear view device of a vehicle, an actuator housing being rotatably and axially displaceably borne by the body and a drive assembly being supported by the actuator housing and being configured for automatically rotating the actuator housing relative to the body about the folding axis between a first angular position and a second angular position and for axially displacing the actuator housing relative to the body along the folding axis between a first axial position and a second axial position.

An actuator for a rear view device of a vehicle, a rear view device and a vehicle with such an actuator includes a body defining a folding axis for a rear view device of a vehicle, an actuator housing being rotatably and axially displaceably borne by the body and a drive assembly being supported by the actuator housing and being configured for automatically rotating the actuator housing relative to the body about the folding axis between a first angular position and a second angular position and for axially displacing the actuator housing relative to the body along the folding axis between a first axial position and a second axial position.

A cam driver includes a support, a cam, a motor, and a retracting torque applicator. The support supports an object. The cam moves the support. The motor rotates the cam and maintains a position of the cam. The retracting torque applicator applies torque to the cam in a direction to move the object away from a counter object that faces the object.