An overload protection mechanism for a winch that includes an input transmission shaft, an output transmission shaft, and a clutch mechanism. The input transmission shaft has a first transmission end, the output transmission shaft has a second transmission end. The clutch mechanism has a first clutch member disposed on the first transmission end and a second clutch member disposed on the second transmission end such that the first and second clutch members are correspondingly rotatable with the input transmission shaft and the output transmission shaft. The first and second clutch members are detachably engageable with each other. When the output transmission shaft is overloaded, the first and second clutch members are disengaged for preventing the overloaded power transmission between input transmission shaft and output transmission shaft.

An overload protection mechanism for a winch that includes an input transmission shaft, an output transmission shaft, and a clutch mechanism. The input transmission shaft has a first transmission end, the output transmission shaft has a second transmission end. The clutch mechanism has a first clutch member disposed on the first transmission end and a second clutch member disposed on the second transmission end such that the first and second clutch members are correspondingly rotatable with the input transmission shaft and the output transmission shaft. The first and second clutch members are detachably engageable with each other. When the output transmission shaft is overloaded, the first and second clutch members are disengaged for preventing the overloaded power transmission between input transmission shaft and output transmission shaft.

A protection circuit for protecting a load, such as a winch motor, from an overcurrent as well as from a circuit fault including welded primary switch contacts and a failure of its MOS/FET component. A power MOS/FET is used as a current mirror for sensing load current. A secondary switch is series connected to control the primary switch. A control circuit including a programmable data processor controls the MOS/FET and the secondary switch and senses the current through the MOS/FET's secondary source terminal and senses the voltage at its primary source terminal. The programmable data processor determines whether an overcurrent exists by comparing the sensed power circuit current to a stored overcurrent value and also senses whether the contacts of the primary switch are welded closed and whether the MOS/FET has been damaged. Additional conditions are sensed. Application of power to the load is prevented when such conditions are detected.

A system has a hoist system to lift a payload to a position adjacent to a ceiling of a room Image sensor systems collect visual data and payload depth data within the payload and ambient depth data within the room. A controller is connected to the hoist system and the image sensor systems. The controller is configured to control the motion of the hoist system. The motion of the hoist system is controlled in part by the ambient depth data from the room

A system has a hoist system to lift a payload to a position adjacent to a ceiling of a room Image sensor systems collect visual data and payload depth data within the payload and ambient depth data within the room. A controller is connected to the hoist system and the image sensor systems. The controller is configured to control the motion of the hoist system. The motion of the hoist system is controlled in part by the ambient depth data from the room

Provided is a crane capable of allowing an operator to recognize an error in work information or in a number of windings set in a safety device. A main tension of a main wire rope is calculated from a main output torque of a main winch, a sub output torque of a sub winch, a main drum winding radius of the main winch, and a sub drum winding radius of the sub winch. An estimated hanging load, which is calculated from the main tension, a sub tension of a sub wire rope and the number of windings of the wire rope set in a safety device, is compared with an actual hanging load calculated from fluctuating thrust force and boom information. Thus, the suitability of a work kind or a winding number set in the safety device is determined.

The invention relates to a lifting device, in particular a mobile crane or a cable-operated excavator, having an apparatus for monitoring the raising and lowering procedures of a boom system of the lifting device.

The invention relates to a lifting device, in particular a mobile crane or a cable-operated excavator, having an apparatus for monitoring the raising and lowering procedures of a boom system of the lifting device.

A mechanical overload sensor system for a planetary winch having a biasing means that when overcome by the force on a ring gear, opens an electric switch which terminates power to the winch.

A mechanical overload sensor system for a planetary winch having a biasing means that when overcome by the force on a ring gear, opens an electric switch which terminates power to the winch.