Abstract: A carrier track system for a multi-section telescopic boom structure having a base section, a mid section and a fly section. A pair of flexible tracks carrying flexible hydraulic hoses and electrical cables are positioned within the base and fly sections and are respectively connected between the inner end of the mid section and the bottom wall of the base section; and the inner end of the mid section and the bottom wall of the fly section. A pair of spaced, longitudinally extending channels are positioned within the base and fly sections for guiding the flexible tracks, reinforcing the side walls of the base and fly sections, providing housing for fixed hydraulic and electrical conduits, and providing a support for the wear pads on the inner end of the mid section. A dual rod hydraulic cylinder is connected between the telescopic boom section so that each section can be selectively operated independently, or in a synchronized or proportional manner relative to each other.

Abstract: A crane apparatus includes an upstanding mainframe and a boom unit supported for pivoting movement on the mainframe about a horizontal axis. The boom unit includes a base boom, an outer boom section of one or more outer booms, and a fluid-actuated piston-and-cylinder assembly. A pair of space mounting walls are presented by the base boom in which a hole is defined, and the piston-and-cylinder assembly includes a proximal transverse sleeve sized for receipt between the spaced walls of the base boom in alignment with the hole. A pin is provided that is sized for receipt in the hole and the tubular sleeve for securing the piston-and-cylinder assembly to the base boom. Removal of the pin enables the outer boom section and piston-and-cylinder assembly to be removed from the base boom.

Abstract: An extendible crane boom comprises, in addition to a tubular base boom section (1), a plurality of boom sections (2, 3, 4, 5) telescopically within the base boom section and each composed of a tube and a holder (8, 8', 8", 8"') mounted at an outer end thereof for connecting the tube to a double-acting hydraulic cylinder (9, 9', 9", 9"') with a view to displacing each boom section out of and into an immediately preceding boom section so as to lengthen and shorten, respectively, the crane boom in its entirety. The third and fourth hydraulic cylinders (9", 9"') are located in a first plane which is parallel to the longitudinal extent of the boom and located inwardly of a second plane, in which the first and second hydraulic cylinders (9, 9') are located. This minimizes the overall height of the outermost telescopic boom sections (4, 5), counted as the center distance between the telescopic tube concerned and the associated hydraulic cylinder.

Abstract: A traveling crane including a telescoping boom whose individual telescopically extending boom members are able to be extended and retracted after the disengagement of locking bolt connections using one single stage hydraulic piston and cylinder unit. The boom members are bolted in the respective extended or retracted positions by locking bolts spring-loaded toward the locked setting thereof. The piston rod of the piston and cylinder unit is pivotally attached to the boom joint member terminating the inner end of the outer boom member. An entraining device, which is able to be coupled with a receiving member on the telescopically extending boom members, is arranged in a part of the end of the cylinder, from which the piston rod comes out of the cylinder.

Abstract: A telescopic rod composed of a plurality of tubular rod sections which are mounted so as to be slidable within each other includes a multistage piston-cylinder unit which is arranged within the telescopic rod and is connected to the outermost rod section of the telescopic rod and to the last inner rod section of the telescopic rod. Locking bars are provided in the areas of the inner end faces of individual sections, wherein the locking bars are displaceable in a direction transversely of the longitudinal direction of the rod sections and wherein the locking bars can be placed in operative engagement with the respectively adjacent outer rod section. When the rod sections of the telescopic rod are in the extended end position, the locking bar of each inner rod section engages in a positively locking manner in an opening of the respectively outer adjacent rod section. Spring-biased clamps are provided on the outer sides of the rod sections located between the outermost rod section and the innermost rod section.

Abstract: An improved boom (24) for a sliding boom delimber (10) is disclosed formed from a prestressed, conventional I beam (28). A first segment of a cable bundle (70) extends from the grapple head (36) and is secured adjacent the lower flange (32) of the I beam (28). The second segment of the cable bundle (70) is inside and carried by an energy chain (74) and includes first and second, inversely related, linear portions interconnected by a third, C-shaped portion. A sag plate (60) is coextensive with the first segment and located on the opposite side of the first segment than the lower flange (32) for preventing the first portion from sagging and engaging the first segment. Sides (50, 52) extend from the outer edges of the I beam flanges (30, 32) for partially enclosing the energy chain (74).

Abstract: A loading crane that can be mounted on a lorry has a jib composed of several arms telescopically nested into each other. A hydraulic unit composed of piston and cylinder is arranged between successive arms. When an arm is extended, a stop arranged on the previous arm actuates a valve entrained with the extended arm, which opens a hydraulic supply for the arm that follows the extended arm. Such valve is arranged at the closed end of a hydraulic cylinder of the arm that follows the extended arm.

Abstract: A multistage telescopic boom or jib, in particular for a loading crane on a truck, has hydraulic units each including a piston and a cylinder arranged between the successive, telescopically nested arms. A pipe projects axially from the bottom of the cylinder into the chamber of the cylinder, sealingly extending into the hollow piston rod when the piston is retracted and sealing the chamber of the cylinder from an inner chamber of the hollow piston rod. In order to ensure an automatic extension sequence of the telescopic arms, the inner chamber of each hollow piston rod is linked to the cylinder chamber of the next outer hydraulic unit by a preferably rigid line, and the inner chamber of each hollow piston rod communicates with the cylinder chamber of the same hydraulic unit when the piston is fully extended.

Abstract: A load handling apparatus for a vehicle includes a telescopic boom pivotably mounted on a chassis frame of the vehicle. The boom has first, second, third, and fourth sections telescopically engaged in sequence and mounted so as to be slidable relative to one another. A first hydraulic ram is adapted to move the first and second sections together by way of a synchronizing arrangement, and a second hydraulic ram moves the third section relative to the fourth section. The first section carries a load receiving device and a hydraulic unit for manipulating the load receiving device.

Abstract: A telescoping crane arm assembly includes a base body; a power cylinder extendable from and retractable into the base body; a plurality of crane arm segments extendable from and retractable into one another and the base body; a first mechanism coupling the power cylinder to the crane arm segments for extending the crane arm segments as a unit from the base body when the power cylinder moves from a retracted position into an extended position relative to the base body; and a second mechanism coupling the power cylinder to the crane arm segments for extending the crane arm segments relative to one another when the power cylinder moves from an extended position into a retracted position relative to the base body.