An energy storage system includes a crane and a plurality of blocks, where the crane is operable to move blocks from a lower elevation to a higher elevation (via stacking of the blocks) to store electrical energy as potential energy of the blocks, and then operable to move blocks from a higher elevation to a lower elevation (via unstacking of the blocks) to generate electricity based on the kinetic energy of the block when lowered (e.g., by gravity). The energy storage system can, for example, store electricity generated from solar power as potential energy in the stacked blocks during daytime hours when solar power is available, and can convert the potential energy in the stacked blocks into electricity during nighttime hours when solar energy is not available, and deliver the converted electricity to the power grid.

A hoisting arrangement of a rope hoist includes a hoisting rope, a rope drum with one rope groove for the hoisting rope, and a hoisting member for hoisting a load. The hoisting member includes a rope pulley arrangement for the hoisting rope. The hoisting rope is routed from the rope drum via at least the hoisting member's rope pulley arrangement to a fixed attachment point on the rope hoist. The rope drum is tilted in relation to the horizontal plane in a manner where the first end of the rope drum, towards which the hoisting rope is wound in the hoisting member's upper position, is higher than the rope drum's second end, towards which the hoisting rope is unwound in the hoisting member's lower position.

This overload preventing device is mounted on a mobile work machine, and is provided with: a storage unit which stores lifting performance data in which lifting performance is configured for each operation state, and performance region data in which switching angles are configured that define performance regions, including a front region, a back region, and a side region; and a work machine control unit which controls operation of the mobile work machine on the basis of the actual load and the lifting performance corresponding to the present operation state of the mobile work machine. The lifting performance includes a maximum deployment width performance configured for the front region and the back region, and the switching angles are configured for each operation state on the basis of stability calculations and strength factors such as jack strength.

A first controller of a work vehicle executes a first composition process for composition of a first video imaged by a camera and a second video imaged by a camera and generating composite video data indicating a composite video, and a transmission process for transmitting, to a second controller, the composite video data generated in the first composition process. The second controller of the work vehicle executes a reception process for receiving the composite video data from the first controller, and a display process for displaying the composite video indicated by the composite video data received in the reception process on a display.

A first controller of a work vehicle executes a first composition process for composition of a first video imaged by a camera and a second video imaged by a camera and generating composite video data indicating a composite video, and a transmission process for transmitting, to a second controller, the composite video data generated in the first composition process. The second controller of the work vehicle executes a reception process for receiving the composite video data from the first controller, and a display process for displaying the composite video indicated by the composite video data received in the reception process on a display.

A zero-gravity hoist system including a chain fall, a motor coupled to the chain fall and configured to drive the chain fall in one or more directions, a power supply configured to provide power to the motor, and a controller having one or more electronic processors. The one or more electronic processors are configured to measure a first force of a load in response to receiving an input, store the measured first force in a memory of the controller, measure a second force of the load, determine a difference between the second measured force and the first measured force, and adjust a height of the load based on determining that the second force differs from the first force by a predetermined threshold.

The present invention addresses the problem of providing a crane that can ascertain the state of an area surrounding a hook or a cargo suspended on the hook and that can simultaneously ascertain a braking distance during stopping operations. The invention comprises: drive devices 31-34 that move a boom 7; a control apparatus 20 that controls the operation state of the drive devices 31-34; a camera 41 that photographs, from the distal end portion of the boom 7, an area below said portion; and image display devices 43 and 65 that display the image photographed by the camera 41. For the purpose of stopping the movement of the boom 7, the control apparatus 20 filters basic control signals S for the drive devices 31-34 to create filtered control signals Sf, controls the drive devices 31-34 on the basis of the filtered control signals Sf, estimates the braking distance for the boom 7, and displays the same on the image display devices 43 and 65.

The present invention addresses the problem of providing a crane that can ascertain the state of an area surrounding a hook or a cargo suspended on the hook and that can simultaneously ascertain a braking distance during stopping operations. The invention comprises: drive devices 31-34 that move a boom 7; a control apparatus 20 that controls the operation state of the drive devices 31-34; a camera 41 that photographs, from the distal end portion of the boom 7, an area below said portion; and image display devices 43 and 65 that display the image photographed by the camera 41. For the purpose of stopping the movement of the boom 7, the control apparatus 20 filters basic control signals S for the drive devices 31-34 to create filtered control signals Sf, controls the drive devices 31-34 on the basis of the filtered control signals Sf, estimates the braking distance for the boom 7, and displays the same on the image display devices 43 and 65.

A system for changing work tools on a loading crane includes a first coupling member on the work tool side or the loading crane side with a receiving opening and a second coupling member on the loading crane side or the work tool side with a guide member extending along a longitudinal axis. The guide member engages in the receiving opening by moving the first and second coupling members toward each other. The first coupling member comprises a support surface for axially abutting the second coupling member and the second coupling member comprises a bearing surface complementary to the support surface and a locking element which is movable by a drive between disengaged and engaged positions. The locking element has a clamping surface for frictionally abutting the first coupling member and the first coupling member has an abutment surface complementary to the clamping surface for zero-play axial clamping of the first and second coupling members.

A system for changing work tools on a loading crane includes a first coupling member on the work tool side or the loading crane side with a receiving opening and a second coupling member on the loading crane side or the work tool side with a guide member extending along a longitudinal axis. The guide member engages in the receiving opening by moving the first and second coupling members toward each other. The first coupling member comprises a support surface for axially abutting the second coupling member and the second coupling member comprises a bearing surface complementary to the support surface and a locking element which is movable by a drive between disengaged and engaged positions. The locking element has a clamping surface for frictionally abutting the first coupling member and the first coupling member has an abutment surface complementary to the clamping surface for zero-play axial clamping of the first and second coupling members.