System for determining relative positions and/or relative motions between objects (103, 602, 604). Disclosed systems include a target tracking device (110, 620, 622) on a first object (602) and an optical target on a second object (604). The target tracking device comprises a camera to take images of the optical targets which is configured to track the optical target. The system comprises an onshore crane (601), a ship system (700), an aviation system (800) or an offshore crane (100). A controller (115, 615, 715, 815) controls the crane, a ship (701) or a helicopter (801) using the data from the tracking device.

A crane in which a boom that is capable of derricking and extending/retracting is provided to a swiveling base includes: an operable-range-setting unit that sets an operable range in which a load being transported can be transported, the operable range being set according to the weight of the load; a path generation unit that generates, within the set operable range, a plurality of nodes through which the load can pass and a plurality of paths connecting adjacent nodes; and a transport path determination unit that determines a transport path of the load on the basis of a priority sequence for actuating a plurality of actuators of the crane, the transport path satisfying a prescribed condition, and being determined from the generated plurality of nodes and plurality of paths.

Provided is a dynamic-lift-off determination device capable of quickly performing a dynamic-lift-off determination by a simple method, while suppressing swinging of a load. A dynamic-lift-off determination device C includes: a boom 14 that is configured so as to be freely raised and lowered; a winch 13 that lifts/lowers a suspended load via a wire rope 16; a load-weight measuring means 22 that measures a load weight acting on the boom 14; a rope-length and lifting-speed measuring means 24 that measures the rope length of the wire rope 16; and a control unit 40 that controls the boom 14 and the winch 13 and that determines, when the winch 13 winds up the rope to dynamically lift off the suspended load, the dynamic lift off on the basis of a temporal change in the measured load weight and a temporal change in the measured rope length.

The present invention addresses the problem of providing: a crane control method whereby, during automatic transportation of a load along a preset transport route using a crane, it is possible to reliably transport the load along the route; and a crane that can be controlled by the crane control method. A control device (32) calculates target speed signals (VU), (VW), (VR) for designating the target hoisting speed and the target rotational speed of a boom (9) and the target winding/unwinding speed of main wire rope (14) or sub wire rope (16), calculates the maximum speeds (VUmax), (VWmax), (VRmax) of the hoisting and rotation of the boom (9) and winding/unwinding of the main wire rope (14) or the sub wire rope (16), and, if a target speed exceeds the corresponding maximum speed, controls the crane (1) by multiplying the target speed signal (VU), (VW), (VR) by a coefficient and restricting the target speed signal (VU), (VW), (VR) to be less than the corresponding maximum speed.

The focus of the present disclosure is on portable cranes and cantilevered base systems. In particular, portable cranes and cantilevered base systems which are lightweight, easy-to-operate, safe, inexpensive, and have extended reaches with high-load capacities would be advantageous for a variety of applications. A cantilevered support to a pivotable arm that is provided by the present disclosure provides advantages when compared to other portable cranes, such as the ability to: 1) extend an arm and reach of a crane, 2) increase a load that can be lifted or lowered, 3) operate a portable crane and cantilevered base system freestanding without attaching a base to a floor, surface, or bed of a vehicle, and 4) augment the structural capacity of a portable crane and cantilevered base with mechanical devices to support a variety of applications.

There is provided a crane for enabling easily carrying out an operation of a boom such as raising and lowering, telescoping, or turning, by displaying a range wherein a hook may be moved or may not be moved in a direction approaching a vehicle part of the crane. The crane includes: a vehicle; a boom positioned upon the vehicle; a wire rope being suspended from a base end side of the boom toward a leading end side thereof; a hook being hung from the leading end side of the boom and raised and lowered by winding and unwinding the wire rope; a camera for photographing an image including the hook; a display device for displaying the image; and a control device connected to the camera and the display device, the control device being for processing information. On the basis of the length of the boom or the height of the hook, the control device computes an inner boundary which is a boundary between a range where the hook may move, and a range where the hook may not move, in a direction approaching the vehicle. The display device displays an image wherein images indicating the inner boundary are superimposed on the image photographed with the camera.

A vehicle crane comprising a jib that is raised and lowered by at least one main tensile connector, and a counter jib, where the main tensile connector extends between a first connecting point in the region of a jib head and a second connecting point in the region of a counter jib head. To reduce loading on the jib, in particular during raising and lowering and increase its bearing load overall, the jib has a third connecting point between the first connecting point and its foot opposite the head, and a secondary tensile connector extends between the third connecting point and a fourth connecting point in the region of the head of the counter jib, or the secondary tensile connector extends between the third connecting point via a seventh connecting point on the main tensile connector and a fourth connecting point in the region of the main jib foot.

The invention pertains to a crane, a method for assembling a crane and a method for disassembling a crane. The crane comprises: a first mast which is tiltable relative to the crane base around a first mast pivot axis into an inclined mast operating position; and a receiving device, which is adapted to receive the mast section of the first mast, which receiving device has a receiving device central axis parallel to the central mast axis, and a mast section guide which is adapted to guide movement of the mast section relative to the receiving device in the direction of the receiving device central axis, wherein the receiving device is connected to the crane base and the first mast is tiltable relative to the crane base around the first mast pivot axis.

A telescoping jib of a mobile crane includes sections that telescope out of a jib housing from a transport position into an operating position. A guying system has successively connected tension rods extending from the jib housing to at least one of the extended telescoping jibs by at least one guying support. The mobile crane provides a lighter construction and improved road handling, and an increased load capacity for unchanged telescoping jib measurements. To this end, a guide holder arranged on the jib housing receives the tension rods in the transport position and, in the operating position, at least one movable tension rod on one of the guying supports is respectively securely connected to the outer end of a telescoping section head in an articulated manner and can be secured to a holding mechanism on the opposite end on an adjacent guying support of an adjacent telescoping section head.

A hydraulic crane comprising: —a rotatable column (7); —a crane boom system (10) comprising two or more liftable and lowerable crane booms (11, 13); and—an electronic control device (25), which is configured to prevent an execution of crane boom movements that would make the lifting moment of the crane exceed the maximum allowed lifting moment of the crane, and to continuously establish position information as to the prevailing position of the load suspension point (P) of the crane boom system. When the lifting moment of the crane has reached a limit value at a given level below the maximum allowed lifting moment, the electronic control device is configured to prevent the execution of any combination of crane boom movements that would increase the horizontal distance between the load suspension point and said vertical axis of rotation and at the same time allow the execution of any combination of crane boom movements that keeps said horizontal distance unchanged or reduces said horizontal distance.