A rotary chain jack may include a frame, a dual chain wheel rotatably coupled to the frame, and a stopper assembly mechanically coupled to the frame. The stopper assembly may include latches. The stopper assembly may be positioned to selectively engage a chain passing over the dual chain wheel. The rotary chain jack may be used to moor offshore structures.

A rotary chain jack may include a frame, a dual chain wheel rotatably coupled to the frame, and a stopper assembly mechanically coupled to the frame. The stopper assembly may include latches. The stopper assembly may be positioned to selectively engage a chain passing over the dual chain wheel. The rotary chain jack may be used to moor offshore structures.

There is provided a crane winch device allowing a suspended load to freely fall due to a load thereof. The crane winch device includes a winch drum around which a rope for suspending the suspended load is wound, braking brake unit that brakes the winch drum, speed-increasing unit that performs speed-increasing assist of the winch drum in a direction of free fall acceleration when a braking force of the brake unit is smaller than a first threshold, and an adjustment unit that adjusts the first threshold.

A brake device includes: a fixed member; a moving member which is movable between a retracted position in which the moving member is adjacent to the fixed member and separate from a braking member, and a braking position in which a friction plate of the moving member contacts the braking member and provides a braking force to the braking member; an elastic member connected between the moving member and the fixed member; a coil disposed in the fixed member; and a controller which provides an operating current to the coil when the elevator is in normal operation, wherein the controller is configured to implement a test mode in which the controller provides a test current less than the operating current to the coil and determines whether the moving member has been attracted to the retracted position.

A braking device, a braking system for an elevator, and an elevator system. The braking device comprises a braking unit and an actuating unit arranged to cause the braking unit to be in a braking state to provide a braking force to a mating external component, or in a non-braking state to stop providing the braking force to the external component, and the braking device further comprises a vibration isolating member with non-linear rigidity, for providing an effect of damping and vibration isolation between the actuating unit and the braking unit at least in the non-braking state.

Provided is an elevator device, in which a hoisting machine includes a main shaft, a brake drum rotatable about an axis of the main shaft, and a brake unit arranged at a position on a radially outer side of the brake drum. The brake unit includes a movable member and presses the movable member in an obliquely upward direction against an outer peripheral surface of the brake drum to apply a braking force to the brake drum. The car guide rail is retained by an upper rail bracket at a position higher than a position of the machine base. The brake unit is arranged at a position higher than the machine base and lower than the upper rail bracket.

A system for a mineral extraction system includes a shaft rotatably supported on a platform, a first motor having a first output shaft that is coupled to a first end portion of the shaft to drive rotation of the shaft, and a second motor having a second output shaft that is coupled to a second end portion of the shaft to drive rotation of the shaft. The system is devoid of a transmission between the first motor and the shaft.

The present invention provides a powered winch retrieval system for harvested big game that can be configured either as a small trailer attachable to a vehicle via a hitch, or as a cantilevered unit couplable to a standard vehicle receiver hitch. The winch incorporates a frame that supports an internal combustion engine having a centrifugal clutch or constant velocity transmission (CVT) mounted thereon, a jack shaft chain driven by the centrifugal clutch or CVT for speed reduction and torque amplification, an output shaft on which is mounted a cable take-up spool, a norm ally-on disc brake assembly mounted on the final output shaft, a combination brake release and throttle lever, and an optional oscillating level-wind assembly. The level-wind assembly, which incorporates a linear ball-bearing bushing, ensures that the cable used to retrieve harvested game winds evenly on the take-up spool.

The present invention provides a powered winch retrieval system for harvested big game that can be configured either as a small trailer attachable to a vehicle via a hitch, or as a cantilevered unit couplable to a standard vehicle receiver hitch. The winch incorporates a frame that supports an internal combustion engine having a centrifugal clutch or constant velocity transmission (CVT) mounted thereon, a jack shaft chain driven by the centrifugal clutch or CVT for speed reduction and torque amplification, an output shaft on which is mounted a cable take-up spool, a norm ally-on disc brake assembly mounted on the final output shaft, a combination brake release and throttle lever, and an optional oscillating level-wind assembly. The level-wind assembly, which incorporates a linear ball-bearing bushing, ensures that the cable used to retrieve harvested game winds evenly on the take-up spool.

A brake apparatus stops a rotor of an external-rotor motor that drives the head or a joint of a home robot. Frictional torque is generated when a friction pad presses a rotor surface even when a power source is switched off. A posture of a moving part, such as the head, of the robot is not abruptly disturbed even though the power source is switched off. Since a light external force is applied to the moving part of the robot in the off state of the power source, a motion in a direction desired by the user takes places without being stiff. The motion of the head of the robot stops when the external force is removed. An intention of the user who touches the robot may be satisfied even when the power source of the robot is switched off.