A mobile shaft winch, includes a carrier vehicle having a vehicle drive, with an internal combustion engine, a rigid main frame, and a rotary platform arranged on the main frame by a rotary connection. A drum winch is arranged on the rotary platform and has a cable drum driven by a winch drive. A hydraulic system arranged on the carrier vehicle includes a hydraulic pump driven by an electric motor a pressure side of the hydraulic pump is in fluid-conducting connection with a hydraulic motor of the winch drive. The internal combustion engine of the vehicle drive drives an electric generator through an auxiliary output drive. The electric motor is configured to be selectively operated on an electricity supply grid or the electric generator.

An apparatus for a crane comprises a large-cavity pressure sensor, a small-cavity pressure sensor, a controller, a telescopic oil cylinder, and a telescopic oil cylinder regulator. The large-cavity pressure sensor can measure the oil pressure in a large cavity of the telescopic oil cylinder. The small cavity pressure sensor can measure the oil pressure in a small cavity of the telescopic oil cylinder. The controller can control an output electrical signal according to a large-cavity oil pressure fed back by the large-cavity pressure sensor and a small-cavity oil pressure fed back by the small-cavity pressure sensor, and, by means of the electrical signal, control a change of the amount of hydraulic oil flowing into and out of the large cavity and the small cavity of the telescopic oil cylinder so as to regulate the oil pressures in the large cavity and the small cavity.

A system and method for retaining a linear actuator on a crane component such as a mast is disclosed. In the system a retaining mechanism is mounted on either a body of the linear actuator or the crane component and a catch is mounted to the other of the body or the crane component. Retraction of a rod of the linear actuator causes a cap on the rod to contact the retaining mechanism, which causes the retaining mechanism to move into a latched configuration securing the linear actuator.

An expansion/contraction mechanism includes a telescopic cylinder, boom fixing means, cylinder-boom connecting means, and a hydraulic-pressure supply unit, and telescopes a plurality of booms except a base boom by telescoping the telescopic cylinder. The hydraulic-pressure supply unit includes a pneumatic-pressure source, a selector valve which selects a destination of air provided from the pneumatic-pressure source, a first pneumatic path through which first air sent from the selector valve circulates, a second pneumatic path through which second air sent from the selector valve circulates, a first pneumatic-to-hydraulic conversion unit which converts a pneumatic pressure provided by the first air to a hydraulic pressure and supplies the hydraulic pressure to a first hydraulic cylinder, and a second pneumatic-to-hydraulic conversion unit which converts a pneumatic pressure provided by the second air to a hydraulic pressure and supplies the hydraulic pressure to a second hydraulic cylinder.

A boom assembly for a lift device includes a plurality of telescoping boom sections. The plurality of telescoping boom sections include a base boom section, a mid boom section, and a fly boom section. The plurality of telescoping boom sections define an inner volume. The boom assembly also includes a push tube coupled to the base boom section and a support member positioned within the inner volume. The support member includes sidewalls having an inner surface and an outer surface. The boom assembly also includes a power track positioned within the inner volume that includes a plurality of movable links, a first supported portion that interfaces with at least one of the inner surface of the support member and a surface of the push tube, and a second supported portion that interfaces with the outer surface of the support member.

A personal safety system for lifting material or supporting person therefrom includes a base and a mast rotatably coupled to the base. The mast has a plurality of mast sections that telescope relative to each other along an axis such that the mast is movable into and between a lowered configuration and an extended configuration. A jib is coupled to the mast and a cable is coupled to the jib such that a cable is configured to couple to the material or the person such that the system is capable of lifting the material or supporting the person. An attachment device coupled to the base is configured to permit a vehicle to couple to the system via the attachment device.

A method for operating a telescopic device and the elongated telescopic device per se comprises a support element formed to encompass first and second telescopic element mounted so as to be telescopically slidable relative each other in a longitudinal direction; the support element comprises a support element fluid actuator assembly; the first telescopic element is arranged to encompass the second telescopic element and comprises a first fluid actuator assembly. The support element fluid actuator assembly is fixed to an interior portion of the support element and is arranged for engagement or disengagement to a first envelope surface of the first telescopic element and wherein the first fluid actuator assembly is fixed to a first interior portion of the first telescopic element and is arranged for engagement or disengagement to a second envelope surface of the second telescopic element.

The operating machine boom is an operating machine boom 40 including a tubular boom member 41 configured such that an upper member 42 and a lower member 43 with U-shaped sections are welded together with each upper flat portion 42a butting with a corresponding one of lower flat portions 43a. A welded portion 41b between the upper member 42 and the lower member 43 is on a compression portion B side with respect to a stress neutral point P at a boundary between a compression portion B at which compression stress is caused and a tension portion A at which tensile stress is caused when a load acts downwardly on a tip end side of the boom member 41, and a reinforcement member 44 is arranged on an inner surface side of the welded portion 41 b.

A crane boom has three telescoping sections which move consistently in a sequential pattern between extended and retracted positions. When extending, the outer section moves first, followed by the middle section. When retracting, the middle section moves first, followed by the outer section. A pair of hydraulic actuators with a series of valves control the extension and retraction of the outer and middle boom sections.

A crane including a crane arm with a crane tip and an implement arrangeable on the crane tip. The at least one part of the implement is movable in relation to the crane tip. A crane controller controls the crane arm and the at least one part of the implement. The crane controller can issue control commands by a user for movement of the crane arm and for movement of the at least one part of the implement. With an implement on the crane tip, when predetermined control commands are issued by a user for movement of the at least one part of the implement arranged on the crane tip, additional control commands for movement of the at least one crane arm can be given off by the crane controller to at least partially compensate for the movement of the at least one part of the implement.