A method for indirectly determining an extension length of a telescopic push arm of a telescopic jib relative to a further telescopic push arm or to a main arm of the telescopic jib of a hoist includes a first sensor ascertaining a first parameter of the telescopic push arm and/or telescopic jib. On the basis of the first parameter, a first virtual extension length is determined and/or calculated. The first sensor and/or at least one further sensor ascertains a further parameter of the telescopic push arm and/or telescopic jib. On the basis of the further parameter, a further virtual extension length is determined and/or calculated. The extension length of the telescopic push arm or the telescopic jib is determined and/or calculated by the first virtual extension length and the further virtual extension length.

A fall protection system includes a base plate defining a first side and a second side defined opposite to the first side. The fall protection system also includes a mast assembly connected to the base plate proximate to the first side of the base plate. The fall protection system further includes a jib inclined with respect to the mast assembly and pivotably connected to the mast assembly. The fall protection system includes a counterweight connectable to the base plate proximate to the second side of the base plate.

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.

An auger attachment system for an extendable boom having a first stage, and a second stage, the auger attachment system having a fixed mounting configured to couple to an auger, the fixed mounting being coupled to the second stage of the extendable boom, an extendable mounting, configured to couple to the auger, the extendable mounting being coupled to the first stage of the extendable boom, and a linear actuator configured to extend and retract the extendable mounting to transfer the auger from the extendable mounting to the fixed mounting.

The invention relates to an arrangement of a control system arranged, or to be arranged, on a hydraulic lifting device, and of a mobile control module, via which the control system can be remote-controlled. The control system can be supplied with sensor data via signal inputs, and a processing unit of the control system is configured to calculate from said sensor data and from stored lifting device-specific data information, which is characteristic for the current lifting load situation and/or the allowability of work processes on the lifting device, optionally in the given current lifting load situation. The control system has a mode, in which the control system transmits the information that is characteristic for the current lifting load situation and/or the allowability of work processes on the lifting device, optionally in the given current lifting load situation, to the mobile control module, via a transmitting and receiving module, to a transmitting and receiving module of the mobile control module in a wireless and/or cable-bound manner. From said information, a processing unit of the mobile control module calculates graphic data for a display, which can be displayed for a user via a display unit.

The telescopic lift arm (1) for self-propelled operating machines (10), such a lifters, telehandlers and the like, comprises three tubular elements (21, 22, 23, 24, 25, 26), having a decreasing section and telescopically connected to one another to define a support structure which is able to move between a retracted configuration in which the tubular elements (21, 22, 23, 24, 25, 26) are inserted in one another, and an elongate configuration, in which two tubular elements are extracted. The arm (1) comprises a hydraulic actuator (4), associated to the support structure (21, 22, 23, 24, 25, 26) and provided with three hydraulic elements (41, 42, 43) telescopically connected to one another, each of which is connected to a respective tubular element of the support structure.

Apparatus for use to remove and/or replace cement slat, cement supports in a cement slatted flooring of an animal pen, comprising a manually operable engine driven wheeled vehicle characterized by being supportable on a slotted concrete slat flooring and on the area proximate thereto, an elevated extendible boom pivotably attached to the vehicle at the boom's proximate end and having grasping members at the boom's distal end, a hydraulic device coupled between the vehicle and the boom and between the ends of the boom for pivotally raising and lowering the boom, and manually operable controls for operating the hydraulic device located on the vehicle whereby the vehicle and the boom are manually operable to place the grasping members into the vicinity of a flooring cement slat or a flooring support for attachment thereto to raise the flooring cement slat or flooring support and carry it to an alternate site.

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.

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.

The invention relates to a cylinder head body, a single cylinder bolt system and a crane, wherein, the cylinder head body comprises at least two branch bodies of cylinder head body, a cooperative positioning structure and a fixed connection structure are provided between two adjacent branch bodies of cylinder head body of the at least two branch bodies of cylinder head body, the branch body of cylinder head body has a cylindrical branch body structure, the cylindrical branch body structures of the at least two branch bodies of cylinder head body are cooperatively positioned by means of the cooperative positioning structure and are detachably connected by means of the fixed connection structure to form a barrel. The cylinder head body is composed of at least two branch bodies of cylinder head body in a dismountable way, which are cooperatively positioned and detachably connected by the cooperative positioning structure and the fixed connection structure, respectively, such that the cylinder head body may be dismounted into branch body structures during assembling, assembling manner thereof is not restricted by traditional assembling sequence, thereby improving the assembling efficiency and production efficiency. Moreover, the branch body structure of the cylinder had body is easy to dismount and maintain, which saves maintenance cost.