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.

A telescopic boom for a crane has at least two telescopable telescoping sections in the form of lattice pieces, each of which exhibits a hollow structure that has in essence the shape of a box. The bottom chords of adjacent sections have in each instance a pinning structure to provide for pinning to each other during normal crane operations. By way of the design of at least the outer telescoping section, at least some of the force that is introduced into the pinned joint can be dissipated into the top chord of the boom.

An automatic boom telescopic motion apparatus for a working machine includes an automatic telescopic motion part configured to continue the telescopic motion of the boom without inputting an operation to perform the telescopic motion of the boom by the boom telescopic motion input part, in a state in which the on/off operation part is turned on, when the output detection part detects an output which is equal to or greater than a predetermined value and an operation is inputted to the boom telescopic motion input part to increase the speed of the telescopic motion of the boom to a value equal to or higher than a predetermined value.

According to the present invention, a work machine comprises a plurality of booms that are extended and retracted by motive power from an actuator, a first pin that is moved by a first spring to connect the boom and the actuator and is moved by motive power from a motor to release a connection of the boom and the actuator, a second pin that is moved by a second spring to connect adjacent booms and is moved by motive power from the motor to release a connection of the adjacent booms, and a first detection device and a second detection device that detect the positions of the first pin and the second pin on the basis of the rotation of a rotary member that is rotated by motive power from the motor.

A locking head assembly (210) for a telescoping boom (118) of a crane (110) includes a locking head (212) having a base (218), an operating plate (220) operably coupled to the base, one or more cylinder pins (222) and/or one or more section lock arms (226) movable in response to movement of the operating plate relative to the base. An actuator (214) is operably coupled to the operating plate and configured to move the operating plate relative to the base. The actuator includes a motor (234) and a drive arm (236). The motor is configured to drive the drive arm between a drive arm first position and a drive arm second position. A motion mitigator (216) is connected to the actuator and the locking head and includes a housing (238), a rod (240) movable relative to the housing, and a biasing device (242) disposed between the rod and the housing.

The invention relates to a collar bearing for a telescopic boom for the sliding support of two telescopic sections in the collar region of the outer telescopic section, wherein the collar bearing includes fixing means, whereby the collar bearing selectively is releasably connectable with the outer or inner telescopic section.

This work machine includes: an actuator that extends and retracts a telescopic boom; an electric drive source that is provided in the actuator and drives using power supplied from a power source; an operating unit that operates based on power of the electric drive source; an electric circuit capable of switching between a drive state in which a supply of power from the power source to the electric drive source is allowed to drive the electric drive source, and a braking state in which the supply of power from the power source to the electric drive source stops to generate a braking force to be applied to the electric drive source; and a control unit that controls the switching between the drive state and the braking state.

A mobile telescopic crane has a telescopic jib with at least three part-jibs. Each of the part-jibs is constructed from at least two part-jib portions so as to be telescopic in a longitudinal direction. Part-jib portions arranged at a spacing from one another transverse to the longitudinal direction each form a jib portion with at least one flexurally rigid connecting element. Respective adjacent jib portions are mechanically lockable with respect to one another in the longitudinal direction. A construction of this type of the jib means that an increase in the bearing load is easily achieved by increasing the area moment of inertia of the jib.

A drive of a sliding connecting member of a locking system of a telescopic system, having a telescopic cylinder (1) with an outer telescopic section (2, 3) and an inner telescopic section (6, 7), which are each provided with a locking hole (5) into which a locking bolt (11) can be entered and withdrawn in a releasable manner via the sliding connecting member (14), provided with a sliding path (12), and a grasper (10), wherein the locking bolt (11) is designed to be moveable by means of an engagement member (9) running in the sliding path (12) in such a way that the locking bolt (11) effects a linear movement and the jib sections (3, 6) can be connected to one another by insertion of the locking bolt (11) into the bolting hole (5) and the sliding connecting member (14) can be driven by an electric linear drive (4).

An automatic boom telescopic motion apparatus for a working machine includes an automatic telescopic motion part configured to continue the telescopic motion of the boom without inputting an operation to perform the telescopic motion of the boom by the boom telescopic motion input part, in a state in which the on/off operation part is turned on, when the output detection part detects an output which is equal to or greater than a predetermined value and an operation is inputted to the boom telescopic motion input part to increase the speed of the telescopic motion of the boom to a value equal to or higher than a predetermined value.