A drive transmission device includes a rotatable driving member; a rotatable follower member, and an elastic member. The drive transmission device includes a first rotatable member and a second rotatable member. The first rotatable member includes first and second driving portions and a limiting portion. The second rotatable member includes a first driven portion, a second driven portion and a contact portion contacting the limiting portion. The second driving portion is adjacent to the limiting portion with respect to a rotational axis direction of the first rotatable member. The second driven portion is adjacent to the contact portion with respect to a rotational direction of the second rotatable member.

A reclining apparatus (51) includes: an internal gear (61) that has internal teeth (61c) which are formed on an inner peripheral surface thereof; an external gear (63) that has external teeth (63a) which have a smaller number of teeth than that of the internal teeth (61c) and are formed on an outer peripheral surface thereof; a first wedge (71) and a second wedge (73) that are provided so as to be movable along a peripheral direction in an eccentric annular space between the internal gear (61) and the external gear (63); and a striker (79) that has a pressing portion having a pair of first protrusion portions and second protrusion portions capable of pressing the first wedge (71) and the second wedge (73). The striker (79) has a plurality of the pressing portions (81, 83).

A backdrive braking element is provided for preventing backdrive of a shaft. It includes a poly-lobed locking mechanism including an unlock shaft that has a polygon shaped inside profile and is coupled to a poly lock drive and brake assembly. The poly lock drive and brake assembly includes a plurality of poly lock drive and brake segments and is contained within the interior cavity of a housing.

A driving device includes: a transmission mechanism; a driving mechanism, moved with the transmission mechanism; a linkage mechanism, moved with the driving mechanism and including a locking unit; and a housing, including an accommodation seat and sealing cover, the accommodation seat accepting the transmission, driving and linkage mechanisms, the sealing cover in combination with the accommodation seat to seal the transmission, driving and linkage mechanisms, one end of the linkage mechanism partly extended out of the sealing seat, and the locking unit partly pressed against an inner side wall of the accommodation seat. Whereby, the transmission mechanism is actuated to drive the driving mechanism to rotate, allowing the driving mechanism to drive the linkage mechanism to rotate; the action of the transmission mechanism is stopped, the locking unit locks the linkage mechanism, thereby capable of preventing power waste and the damage of the transmission mechanism and driving mechanism.

The invention relates to a solar plant (1) having at least one pivotable module table (2a, 2b, 2c) which supports at least one photovoltaic solar module (3), preferably multiple photovoltaic solar modules (3), and is coupled in such a manner to at least one gear element (4) pivotable about an axis (A) that pivoting the gear element (4) causes the module table (2a to 2c) to be pivoted so that the solar modules (3) track the motion of the sun, the gear element (4) being driven and thus pivoted by an electrically driven drive shaft (5), at least one actuation element (8) being integrated in the drive shaft (5), the gear element (4) being both driven and blocked by the actuation element (8), the actuation element (8) engaging into the toothing (11) of the gear element (4) for driving or blocking the gear element (4).

A linked locking mechanism and antenna down-tilt angle control device is described. Linked locking mechanism includes: mounting frame with a mounting positions, each mounting position has a mounting through hole and a clamping body. Output assembly includes an output shaft and output gear resiliently disposed on output shaft. One end of output gear has engaging body engaged with clamping body and pressing body provided through mounting through hole. Rotating bracket has pressure bearing surface pressed against pressing body. Arc-shaped embossments are provided on pressure bearing surface. The arc-shaped embossment includes guide end, anti-reverse end, and mating body. When mating body and pressing body abut, and engaging body and clamping body are separated, output gear drives output shaft to rotate. Linked locking mechanism and antenna down-tilt angle control device provide easy positioning and accurate control of down-tilt angle of antenna.

The present invention is directed to a self-locking non-backdrivable gear system. The gear system may comprise a primary motor input and gear box. The primary motor input is for rotation of the gearbox about the axis of a drive shaft. The gearbox may comprise an input ring gear, one or more locking gears, fixed gear, and output gear. In operation, rotation of the primary motor input causes rotation of the ring gear which causes rotation of the locking gear which causes rotation of the output gear which causes rotation of the drive shaft. However, in the absence of rotation of the ring gear, a rotational force applied to the output gear causes the gear teeth on the fixed and output gears to lock the gear in place.

A torque limiter and no-back assembly comprises an input shaft, an output shaft, a torque limiter provided between the input shaft and the output shaft, the torque limiter comprising a torque sensing element; and a no-back device arranged to brake the output shaft when the torque sensing element senses levels of torque above a threshold level between the input shaft and the output shaft, characterised in that the torque sensing element comprises a torsion spring having ends which are coupled to the input shaft and the output shaft for rotation therewith.

Provided is a valve drive device including a power transmission switching unit capable of reducing noise and improving positional accuracy to perform smooth power switching. In the valve drive device, a valve element drive mechanism includes a motor, a driving gear, a driven gear, and a power transmission switching unit configured to switch between a power transmission state and a power non-transmission state. The power transmission switching unit includes at least one convex unit formed on the driven gear, a rotation restriction unit that is pivotably mounted on the driven gear with respect to the driven gear and engageable with the at least one convex unit, and a lever pivoting restriction unit formed on the driven gear and configured to restrict the rotation restriction unit from pivoting. The rotation restriction unit includes a pivot shaft and a lever unit.

A self-locking nut and screw assembly may include a screw and a first nut rotatable and linearly translatable with respect to each other. The assembly may also include a first motor configured to provide torque to one of the screw and the first nut. The assembly may further include a locking mechanism configured to lock the screw to prevent backdrive when the motor is not providing torque to the one of the screw and the first nut.