Telescopic lattice type crane boom for a crane, further comprising a locking system configured to lock at least one telescopic boom section with respect to a base boom section in at least an extended position, wherein said locking system includes a plurality of pins, each pin being configured to extend, in at least the extended position of the boom, at least partly through a corresponding pin receiving aperture provided in one of the base boom section and the at least one telescopic boom section.

A locking head is configured such that it can be moved within and along the longitudinal axis of a telescope, which comprises at least two telescope sections, by means of a telescoping device, comprising a base body, at least one releasing device which is configured to release a telescope section lock and at least one coupling device which is configured to couple a telescope section with the telescoping device. The locking head comprises an operating member which mechanically acts on the releasing device and the coupling device in order to operate the releasing device and the coupling device. The operating member comprises a first link guide for the releasing device and a second link guide for the coupling device, wherein the links for the first and second link guides extend in a single plane or in parallel planes.

The present invention relates to a locking head for telescoping cylinders of a telescopic boom, which has a plurality of telescopic boom portions, and a housing which comprises at least one bolt-like cylinder locking body, which can be moved in and out of the housing in order to lock the locking head with a telescopic boom portion, and at least one bolt-like telescope locking body, which can be moved in and out of the housing in order to release the telescopic boom portion for a telescoping movement. The locking head has at least one electric actuator which is designed to actuate the at least one cylinder locking body and/or the at least one telescope locking body.

An induction sensor assembly for a securing and locking unit of a telescoping jib having at least one signal transmitter configured for generating an electromagnetic stray field oriented towards its active switching surface, and at least one switching element provided for contactless cooperation with the signal transmitter. The signal transmitter and switching element are displaceable relative to each other in relation to an adjusting direction extending in parallel with a main plane. To provide a simple and cost-effective installation of the induction sensor assembly despite having high detection security, the active switching surface of the signal transmitter and the main plane are inclined with respect to each other. As such, the electromagnetic stray field of the signal transmitter is also advantageously inclined whereby a possible displacement between the signal transmitter and switching element cannot exert an influence on the precision of the position detection in relation to the adjusting direction.

Example embodiments relate to a lightweight crane. In one nonlimiting embodiment the crane is comprised of a telescoping boom having a first boom nested in a second boom which in turn is nested in a third boom. The first, second, and third booms may be made from aluminum to reduce the weight of the crane. The first boom may have a first open section and a second closed section wherein the open section is configured to accommodate a structural member to which an actuator is attached. The first and second booms have lower surfaces with inclined surfaces so that the first boom self-aligns with the second boom and the second boom self-aligns with the third boom.

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 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 present invention relates to a single-cylinder plug pin type telescopic arm, a crane and a telescopic method thereof. The single-cylinder plug pin type telescopic arm includes a basic arm and at least one telescopic arm sleeved in the basic arm, wherein coaxial center holes are formed in the tails of the telescopic arms, and a telescopic oil cylinder is arranged in the center holes; the telescopic oil cylinder includes a cylinder rod and a cylinder barrel, at least two cylinder heads are fixedly sleeved on the outer side of the cylinder barrel in the longitudinal direction, and at least three arm pin holes are formed in each of the basic arm and the telescopic arms in the longitudinal direction. The single-cylinder plug pin type telescopic arm provided by the present invention adopts one telescopic oil cylinder and at least two cylinder heads, each cylinder head is adapted to lock and unlock the telescopic oil cylinder and any telescopic arm, the telescopic arms are extended out or retracted in a relay transmission manner to achieve the extension and retraction of the single-cylinder plug pin type telescopic arm, the length of the oil cylinder is shortened, the cylinder diameter and the rod diameter of the oil cylinder are decreased, the cost of the oil cylinder is lowered, the upperstructure weight is reduced, the lifting capacity is improved, and there are more crane design spaces.

The present invention relates to a boom element for a telescopic boom, in particular a telescopic section or a pivotal piece of a telescopic boom, wherein the boom element has a substantially box-shaped hollow structure and wherein at least one component of a pinning system is arranged in at least one of the corner edges of the box-shaped hollow structure, wherein at least one further boom element located in the boom element and/or about the boom element can be pinned to the boom element by means of the pinning system for the purpose of fixing, and wherein the component of the pinning system is and/or includes at least one pin mount and/or at least one pin guide in which the at least one pin is guided and/or movable.

A vehicle crane having a telescoping jib, comprising a basic box with retractable and extendible inner boxes and a securing and locking unit that comprises a first adjusting cylinder and a second adjusting cylinder which are each designed as unilaterally acting hydraulic cylinders with a first spring element and a second spring element as well as a first line and a second line, where the first adjusting cylinder moves locking bolts between operating states of unbolted and bolted and the second adjusting cylinder moves driving bolts between operating states of secured and released. In the event of a malfunction, the first adjusting cylinder moves to the bolted operating state and the second adjusting cylinder moves to the released operating state.