A mobile lifting apparatus, comprising at least one truck, provided with a first drive device comprising at least one internal combustion engine connected by power transmission means to one or more user devices of the truck hydraulically actuated, and at least one boom provided with a second drive device.

The invention relates to a tread device for walking on a crawler carrier of a work machine having a caterpillar drive, wherein the tread device has a holder that can be installed at the crane, in particular at the crawler carrier, at which at least one tread surface is provided, characterized in that the tread surface lies on the upwardly disposed surface of a crawler chain of the caterpillar drive in the state installed at the work machine and the lower side of the tread surface comprises at least one sliding element to ensure a sliding or rolling relative movement between the crawler chain and the tread surface.

A crane vehicle achieves safe movement by reliably detecting an obstacle in a region which is a blind spot from the opposite side of the driver seat across a boom. The crane vehicle includes an obstacle sensor which is a transmission/reception antenna that transmits a detection wave and receives the detection wave reflected from the obstacle. A signal corresponding to the reflected wave received by the obstacle sensor is amplified and input to a controller, which calculates the position and the size of the obstacle on the basis of the signal. The controller generates an obstacle display image and displays the image on a display, the obstacle display image including a vehicle object that represents a crane vehicle and an obstacle object which is an object corresponding to the calculated size of the obstacle and which is disposed at a position corresponding to the calculated position of the obstacle.

A hydraulically actuated liftable and lowerable hook of a crane has a hydraulic system comprises at least one working machine with a hydraulic motor driving a winch. At least one drive machine comprising a pump is connected directly or indirectly to at least one of the working machines by means of two connections via corresponding working lines, which serve as a feed or return depending on the operating state of the working machine. A lowering brake valve is provided in one working line and is connected to the other working line via a control line such that the lowering brake valve is displaceable against a restoring force by pressure, which prevails in the other working line and is forwarded via the control line, from the blocking position of said valve into a through-flow position for lowering the hook by means of a primary winch.

A crane, a method for assembly of a crane and a method for disassembly of a crane are disclosed. In accordance with the method, a first mast is fixed in a vertical position. A top mast section of a second mast is positioned adjacent to and outside of the first mast. The top mast section is moved vertically upwards, and this movement is guided by a guide system. Then, the top mast section is fixed relative to the first mast at a position which is at a larger vertical distance from the crane base. Then, a first intermediate mast section of the second mast is fixed to a lower end of the top mast section to build up the second mast. Then, the first intermediate mast section is connected to a pivot, and the second mast is pivoted away from the first mast.

Provided is a crane including: an operable function part; an actuator; a generation part; a filter part filtering a first control signal and generating a second control signal; a control part controlling the actuator based on the second control signal; and a computation part computing information relating to a flow quantity estimated as the operable function part moving, if a stop signal has been inputted into the actuator at the present position of the operable function part, from when the stop signal has been inputted into the actuator to when the operation of the operable function part stops. The control part outputs the stop signal to the actuator if information relating to the present position of the operable function part, information relating to a target stop position whereat the operable function part is to be stopped, and the information relating to the flow quantity satisfy prescribed conditions.

An engine hoist attachment assembly for hoisting a vehicle component includes a tube, a bar, and a pair of rods. The tube has a first end that is configured to slidably insert a terminus of a boom of an engine hoist to removably couple the tube to the boom. The bar has a back face that is coupled to and extends bidirectionally and perpendicularly from a second end of the tube so that the bar is substantially parallel to a surface upon which the engine hoist is positioned. The pair of rods is coupled to and extends in parallel from a front face of the bar. The rods are configured to position under a vehicle component, positioning a user to utilize the engine hoist to selectively lift and lower the vehicle component.

An aerial device system includes an adjustable railing and a coupler. The adjustable railing is positionable around at least a portion of a base platform and is movable between a stowed position and a deployed position. A height of the adjustable railing in the deployed position is greater than a height of the adjustable railing in the stowed position. The coupler is communicatively coupled to the adjustable railing and is configured to detect a position of a component of an aerial device of the aerial device system and move the adjustable railing based on the detected position of the component of the aerial device. A method of controlling a cab guard safety system for the aerial device includes detecting the position of the component and moving the adjustable railing to a stowed position or a deployed position based on the detected position of the component.

A system and method of this disclosure control an on/off state of a power take-off by monitoring the power demand of a fluid power circuit that includes the power take-off and a piece of equipment connected to the power take-off. The power demand may be indicated by a pressure or temperature of a fluid power circuit, by a motion of the equipment or its hand-held controller, or by an engine torque of an engine driving the power take-off. When the equipment transitions between an off state and an on state, the controller automatically engages the power take-off. When the equipment is in the on-state for a predetermined amount of time and the power demand is at or below a predetermined threshold during the predetermined amount of timethereby indicating idle time or an inactive state of the equipmentthe controller automatically disengages the power take-off.

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.