A steering actuator comprising a shaft having an input coaxial with an output, wherein the output is in drivable communication with one or more wheels of a vehicle, and a locking mechanism configured to enable the shaft to rotate in both a first direction and a second direction in response to torque provided at the input, and prevent the shaft from rotating in both the first direction and the second direction in response to torque provided at the output.

An electric actuator having a hand-screw release device, including: housing, drive motor, transmission assembly, rotary screw rod and driving nut, and further including: clutch device configured to engage or disengage power transmission between the transmission assembly and the rotary screw rod; a self-locking device configured to produce a friction resistance against the rotary screw rod when the rotary screw rod rotates reversely; and a hand-screw release device including a release rotary knob, the first driving member being connected to the clutch device, the second driving member being configured to connect the self-locking device, and the release rotary knob being turned to present an initial state and a completely released state, wherein in the course of switching from the initial state to the completely released state, the first driving member activates the clutch device to disengage the power connection, and the second driving member activates the release torsion spring to release.

Disclosed is a linear actuator, including a drive motor, a transmission assembly, a rotary screw, a transmission nut, a clutch device, a self-locking device and a hand-pull release assembly. The clutch device is arranged between the transmission assembly and the rotary screw. The self-locking device is configured to generate frictional resistance to the rotary screw when the rotary screw rotates reversely, and the self-locking device includes a release torsion spring. The hand-pull release assembly includes a first driving member connected with the clutch device and a second driving member connected with the self-locking device, and has an initial state and a fully released state. During the process from the initial state to the fully released state, the first driving member drives the clutch device to disconnect power, and the second driving member drives the release torsion spring to extend.

An electric push rod with a dual brake mechanism includes an electric motor, a transmission device, a first brake mechanism and a second brake mechanism. The electric motor has a driving wheel. The transmission device is installed on a side of the electric motor and includes a deceleration mechanism, a lead screw, a driven wheel, and a telescopic pipe. The deceleration mechanism is disposed between the driving wheel and the driven wheel. The lead screw is sheathed with the driven wheel and the driven wheel is driven by the electric motor to rotate together with the lead screw. The telescopic pipe and the lead screw are screwed and driven. The lead screw is sheathed with the first brake mechanism formed on a side edge of the driven wheel. The lead screw is sheathed with the second brake mechanism disposed between the driven wheel and the telescopic pipe.

A drive device has a spindle drive having a threaded spindle and a spindle nut arranged on the threaded spindle. The spindle drive is configured to drive a first component element and a second component element so as to be axially movable relative to one another. The spindle drive is reversibly rotatably drivable around an axis of rotation extending coaxial to the threaded spindle by a rotatably driven driveshaft arranged in a housing so as to be fixed with respect to rotation. A brake device prevents axially relative movement of the first component element and second component element relative to one another through axial application of force to the first component element and/or second component element.

In a ball screw apparatus, a ball train including a plurality of main balls is housed in a raceway between a ball track of a ball nut and a ball track of a ball screw shaft. A coil spring housed in the raceway includes a first end that engages with an end of the ball train and a second end supported by a stopper (a first recessed portion, a protruding portion, or the like) of the ball nut. A stopper ball having a diameter larger than the diameter of the main ball is interposed between the stopper and the second end of the coil spring.

A biopsy system driver includes a motor having a rotatable output shaft, a support structure, a drive shaft, an elongate lead screw and a biopsy instrument drive member. The drive shaft is rotatably coupled to the support structure and includes or is otherwise operatively connected to the motor output shaft such that activation of the motor rotates the drive shaft. The elongate lead screw is coupled to the drive shaft such that rotation of the drive shaft rotates the lead screw about an axis of the lead screw. The lead screw is axially translatable relative to the drive shaft and to the support structure. The biopsy instrument drive member is threadably coupled to the lead screw such that rotation of the lead screw causes axial translation of one of the lead screw and biopsy instrument drive member relative to the other one and to the support structure.

Disclosed is a linear actuator, including a drive motor, a transmission assembly, a rotary screw, a transmission nut, a clutch device, a self-locking device and a hand-pull release assembly. The clutch device is arranged between the transmission assembly and the rotary screw. The self-locking device is configured to generate frictional resistance to the rotary screw when the rotary screw rotates reversely, and the self-locking device includes a release torsion spring. The hand-pull release assembly includes a first driving member connected with the clutch device and a second driving member connected with the self-locking device, and has an initial state and a fully released state. During the process from the initial state to the fully released state, the first driving member drives the clutch device to disconnect power, and the second driving member drives the release torsion spring to extend.

A release mechanism incorporated linear actuator includes an actuator body and a release mechanism connected between a retractable tube set and a coupling. An adapter socket connected to the retractable tube set, a locating socket movably coupled to the adapter socket and connected to the coupling, a brake spring mounted around the adapter socket, a tightening sleeve sleeved onto the locating socket and the brake spring and connected to the locating socket, and a rotary knob attached onto the tightening sleeve. The brake spring is disposed in friction engagement with a surface of the tightening sleeve, having one end piece positioned in the adapter socket and an opposite end piece positioned in the rotary knob. When the rotary knob is rotated to move the opposite end piece, the brake spring is forced to reduce diameter and to wrap about adapter socket, releasing friction engagement between brake spring and tightening sleeve.

A biopsy system driver includes a motor having a rotatable output shaft, a support structure, a drive shaft, an elongate lead screw and a biopsy instrument drive member. The drive shaft is rotatably coupled to the support structure and includes or is otherwise operatively connected to the motor output shaft such that activation of the motor rotates the drive shaft. The elongate lead screw is coupled to the drive shaft such that rotation of the drive shaft rotates the lead screw about an axis of the lead screw. The lead screw is axially translatable relative to the drive shaft and to the support structure. The biopsy instrument drive member is threadably coupled to the lead screw such that rotation of the lead screw causes axial translation of one of the lead screw and biopsy instrument drive member relative to the other one and to the support structure.