A cable hoist having an emergency braking arrangement comprising a dual toothed wheel assembly driven via a cable drum of the hoist. One of two toothed wheels of the toothed wheel assembly is sensed by a sensing lever of an anchor and an opposite end of the anchor interacts with a ratchet wheel of the toothed wheel assembly. As soon as an over speed occurs, the anchor engages in the ratchet wheel and causes a rotary movement of a carrier on which the anchor is mounted. This rotary motion is used to trigger a mechanical braking arrangement coupled to the cable drum.

A cable hoist having an emergency braking arrangement comprising a dual toothed wheel assembly driven via a cable drum of the hoist. One of two toothed wheels of the toothed wheel assembly is sensed by a sensing lever of an anchor and an opposite end of the anchor interacts with a ratchet wheel of the toothed wheel assembly. As soon as an over speed occurs, the anchor engages in the ratchet wheel and causes a rotary movement of a carrier on which the anchor is mounted. This rotary motion is used to trigger a mechanical braking arrangement coupled to the cable drum.

A winch drum tension isolation system includes a winch drum including an outwardly extending flange, the flange including a plurality of holes spaced along the flange. The winch drum tension isolation system also includes a locking mechanism positioned proximate the winch drum and including a locking member engageable with the flange. The locking member is movable between a first position, in which the locking member is received in one of the plurality of holes to prevent rotation of the winch drum, and a second position, in which the locking member is spaced apart from the flange to permit rotation of the winch drum.

A winch drum tension isolation system includes a winch drum including an outwardly extending flange, the flange including a plurality of holes spaced along the flange. The winch drum tension isolation system also includes a locking mechanism positioned proximate the winch drum and including a locking member engageable with the flange. The locking member is movable between a first position, in which the locking member is received in one of the plurality of holes to prevent rotation of the winch drum, and a second position, in which the locking member is spaced apart from the flange to permit rotation of the winch drum.

A device configured to lift and transport a pipe at a worksite includes a base, a mast coupled to the base, a carriage coupled to the mast, a positioning assembly having a cable that is attachable to the pipe for lifting the pipe from a surface of the worksite to the carriage, upon which the pipe is thereafter supportable, and a lifting assembly configured to move the mast and the carriage to a desired elevation relative to the base to further lift the pipe from the worksite surface.

A roof support system and method to stabilize the roof of a transport vehicle during repair work. The system includes a roof support assembly with a planar base, support members, a lower post, and an upper post that is slidably coupled to the lower post. A winch mounted on the lower post operates a pair of winch cables that pass through pulleys on the upper post, allowing the upper post to move upward and bring a horizontal support bar into contact with the roof.

A roof support system and method to stabilize the roof of a transport vehicle during repair work. The system includes a roof support assembly with a planar base, support members, a lower post, and an upper post that is slidably coupled to the lower post. A winch mounted on the lower post operates a pair of winch cables that pass through pulleys on the upper post, allowing the upper post to move upward and bring a horizontal support bar into contact with the roof.

A brake device comprising: a brake receiver pivotally supported in a non-rotatable manner on the drive shaft and including a flange part and a boss part; a female screw member pivotally supported in a rotatable manner on the drive shaft and screwed to a male screw part; a ratchet wheel including ratchet teeth provided on an outer peripheral side and configured to restrict a rotation direction to one direction; a brake plate arranged between the ratchet wheel and at least one of the flange part and the female screw member; and at least one pawl member engaging, on a tip side, with a valley part located between adjacent ratchet teeth, and meshing with the ratchet tooth, wherein the ratchet teeth include tall teeth and short teeth lower in projection height from a rotation center of the ratchet wheel than the tall teeth.

A brake device comprising: a brake receiver pivotally supported in a non-rotatable manner on the drive shaft and including a flange part and a boss part; a female screw member pivotally supported in a rotatable manner on the drive shaft and screwed to a male screw part; a ratchet wheel including ratchet teeth provided on an outer peripheral side and configured to restrict a rotation direction to one direction; a brake plate arranged between the ratchet wheel and at least one of the flange part and the female screw member; and at least one pawl member engaging, on a tip side, with a valley part located between adjacent ratchet teeth, and meshing with the ratchet tooth, wherein the ratchet teeth include tall teeth and short teeth lower in projection height from a rotation center of the ratchet wheel than the tall teeth.

Certain embodiments of the present application relate to an unmanned aerial vehicle including a control system, at least one rotor operable to generate lift under control of the control system, a spool mounted for rotation in a winding direction and an unwinding direction opposite the winding direction, a motor operable to rotate the spool in at least the winding direction under control of the control system, and a brake mechanism including a brake actuator operable to transition the brake mechanism between a locked state and an unlocked state under control of the control system. The brake mechanism in the locked state prevents rotation of the spool in at least the unwinding direction. The brake mechanism in the unlocked state does not prevent rotation of the spool in the unwinding direction.