Provided is a braking apparatus for braking of an electric winch of a construction machine, ensuring safe braking with much regeneration. The apparatus includes a regenerative-power generation unit, a regenerative-power receiving unit, a braking device for mechanical braking separately from the regenerative-power generation unit, and a braking control unit including a necessary-braking-capacity calculation section, a regeneration-capacity calculation section calculating a regeneration capacity, and a command section. The command section, when the regeneration capacity is not less than a necessary braking capacity, performs braking with only a regenerative action while not operating the braking device and, when the regeneration capacity is less than the necessary braking capacity, calculates an auxiliary braking force equivalent to a difference between the necessary braking capacity and the regeneration capacity and brings the braking device into braking action with the auxiliary braking force.

Provided herein is a lanyard attachment for storing a lanyard. The lanyard attachment has a housing, means for releasably storing a lanyard in the housing, for example a rotatable spool, a guide at the proximal end of the housing to guide the lanyard into the housing and a holder at the distal end from which an object is suspended. Also provided is a retractable lanyard in which a cord or lanyard is stored in a coiled configuration within the housing and a system for releasably storing a lanyard in the lanyard attachment.

Provided herein is a lanyard attachment for storing a lanyard. The lanyard attachment has a housing, means for releasably storing a lanyard in the housing, for example a rotatable spool, a guide at the proximal end of the housing to guide the lanyard into the housing and a holder at the distal end from which an object is suspended. Also provided is a retractable lanyard in which a cord or lanyard is stored in a coiled configuration within the housing and a system for releasably storing a lanyard in the lanyard attachment.

A pneumatic and manual clutch of a power winch provides an option of controlling the clutch by a manual or pneumatic method, and the pneumatic control method just needs to connect a pump connector of an air pump to a pneumatic connector the clutch properly to start or stop the air pump even when a user is standing at a position far from the power winch and the clutch can be turned on and off by starting or stopping the air pump, and either a cable or wireless remote control can be used to start or stop the air pump, so as to provide a very convenient operation.

A pneumatic and manual clutch of a power winch provides an option of controlling the clutch by a manual or pneumatic method, and the pneumatic control method just needs to connect a pump connector of an air pump to a pneumatic connector the clutch properly to start or stop the air pump even when a user is standing at a position far from the power winch and the clutch can be turned on and off by starting or stopping the air pump, and either a cable or wireless remote control can be used to start or stop the air pump, so as to provide a very convenient operation.

A door hoist includes a bracket, drive sprocket, ring gear, hub assembly, set of planetary gears, and governor shaft. The drive sprocket has a drive sprocket axis. The ring gear is fastened to the drive sprocket. The ring gear has a ring gear axis that is in alignment with the drive sprocket axis. The hub assembly includes a connector to receive a door drive shaft and secure the door drive shaft in a fixed rotational alignment with the hub assembly. The set of planetary gears is rotationally mounted to the hub assembly. The set of planetary gears is configured to mate with the ring gear. The governor shaft includes a sun gear, brake assembly, and link. The sun gear is configured to mate with the set of planetary gears. The brake assembly has an engaged position and a disengaged position. The sun gear is rotationally fixed relative to the bracket in response to the brake assembly being in the engaged position. In response to the brake assembly being in the disengaged position, rotation of the sun gear is unfixed relative to the bracket. The link secures the brake assembly in the engaged position. The link is configured to melt in response to an ambient temperature exceeding a predetermined temperature.

A door hoist includes a bracket, drive sprocket, ring gear, hub assembly, set of planetary gears, and governor shaft. The drive sprocket has a drive sprocket axis. The ring gear is fastened to the drive sprocket. The ring gear has a ring gear axis that is in alignment with the drive sprocket axis. The hub assembly includes a connector to receive a door drive shaft and secure the door drive shaft in a fixed rotational alignment with the hub assembly. The set of planetary gears is rotationally mounted to the hub assembly. The set of planetary gears is configured to mate with the ring gear. The governor shaft includes a sun gear, brake assembly, and link. The sun gear is configured to mate with the set of planetary gears. The brake assembly has an engaged position and a disengaged position. The sun gear is rotationally fixed relative to the bracket in response to the brake assembly being in the engaged position. In response to the brake assembly being in the disengaged position, rotation of the sun gear is unfixed relative to the bracket. The link secures the brake assembly in the engaged position. The link is configured to melt in response to an ambient temperature exceeding a predetermined temperature.

A fairlead assembly includes a frame structure having an opening therein. A pair of rollers are disposed on opposite sides of the opening. The frame structure includes a pair of opposed curved surfaces disposed between the end portions of the pair of rollers and defining a bordering surface of the opening. The frame can be cast as a unitary structure with the pair of rollers each rotatably supported by a support pin having opposite ends received in a first set of corresponding semi-cylindrical recesses in a surface of the cast frame. A clamp structure having a second set of corresponding semi-cylindrical recesses secure the support pins to the cast frame.

The present disclosure relates to a hydraulic system including a variable displacement hydraulic motor for lifting and lowering a load. The hydraulic motor has a high operating speed and a low operating speed. The system also includes an actuator for controlling whether the hydraulic motor is operating at the high or low speed, and a pressure sensor for sensing when a system pressure corresponding to the hydraulic motor exceeds a threshold pressure value. The system further includes a speed control system that controls the actuator such that the hydraulic motor is prevented from operating at the first operating speed when the system pressure exceeds the threshold pressure value.

The present disclosure relates to a hydraulic system including a variable displacement hydraulic motor for lifting and lowering a load. The hydraulic motor has a high operating speed and a low operating speed. The system also includes an actuator for controlling whether the hydraulic motor is operating at the high or low speed, and a pressure sensor for sensing when a system pressure corresponding to the hydraulic motor exceeds a threshold pressure value. The system further includes a speed control system that controls the actuator such that the hydraulic motor is prevented from operating at the first operating speed when the system pressure exceeds the threshold pressure value.