Abstract: The invention relates to a device with at least one extension arm or support arm for multi-linked crane shaped extension arms, concrete spreader columns and similar, comprising at least one hydraulic differential cylinder for actuating a support arm. The cylinder comprises a hollow piston rod which has a tubular segment and two end pieces arranged on the ends of said segment, whereby at least one of the end pieces is welded on to the segment thereof. The welded joint is machined and the root of the weld is eliminated. At least one of the end pieces comprises a through opening which enables tool access in order to machine the hollow cavity of the hollow piston rod.

Abstract: A distribution device for dense substances, especially concrete, with a distribution boom carrying a concrete-conveyance conduit, with at least one telescopic boom section (4) consisting of a first telescopic component and a second telescope component (6) that can be extended with respect to this first component, as well as at least one reinforcement beam that is arranged on one of the telescope components and carries a section of the concrete-conveyance conduit, wherein a section of the concrete-conveyance conduit in the region of the telescopic boom sections consists of a flexible hose with a compensation loop to accommodate the extension movement of the telescopic motion or of at least one scissor-type conduit assembly made up of swivel elements connected to each other in such a manner than the swivel elements in the two terminal positions of the telescopic boom section are substantially arranged in a crossover position and, together with the articulated joints that interconnect them, move past each other

Abstract: In a vehicle with a superstructure having at least one swiveling mast on a slewing gear and a frame support with the aid of front and back movable telescopes disposed on each side of the long sides of the vehicle, their stationary telescopes being disposed at least partly in an arc tangentially to the longitudinal direction of the vehicle and extending in each case from one of the long sides of the vehicle profile inward substantially as far as the middle of the vehicle and then on to the same long side of the vehicle profile, it is provided according to the invention that the stationary telescopes of the front and back movable telescopes of each long side of the vehicle are realized with a common carrier and disposed one behind the other such that the movable telescopes emerge from the associated ends of the carriers.

Abstract: The invention relates to a device with at least one extension arm or support arm for multi-linked crane shaped extension arms, concrete spreader columns and similar, comprising at least one hydraulic differential cylinder for actuating a support arm. The cylinder comprises a hollow piston rod which has a tubular segment and two end pieces arranged on the ends of said segment, whereby at least one of the end pieces is welded on to the segment thereof. The welded joint is machined and the root of the weld is eliminated. At least one of the end pieces comprises a through opening which enables tool access in order to machine the hollow cavity of the hollow piston rod.

Abstract: A distribution device for dense substances, especially concrete, with a distribution boom carrying a concrete-conveyance conduit, with at least one telescopic boom section (4) consisting of a first telescope component and a second telescope component (6) that can be extended with respect to this first component, as well as at least one reinforcement beam that is arranged on one of the telescope components and carries a section of the concrete-conveyance conduit, wherein a section of the concrete-conveyance conduit in the region of the telescopic boom section consists of a flexible hose with a compensation loop to accommodate the extension movement of the telescope or of at least one scissor-type conduit assembly made up of swivel elements connected to each other in such a manner that the swivel elements in the two terminal positions of the telescopic boom section are substantially arranged in a crossover position and, together with the articulated joints that interconnect them, move past each other during the

Abstract: In a vehicle (1) with a superstructure (2) having at least one swiveling mast (3) on a slewing gear (4) and a frame support (7) with the aid of front and back movable telescopes (14-17) disposed on each side of the long side of the vehicle, their stationary telescopes (23-26) being disposed at least partly in an arc tangentially to the longitudinal direction of the vehicle and extending in, each case from one of the long sides of the vehicle profile inward substantially as far as the middle of the vehicle and then on to the same long side of the vehicle profile, it is provided according to the invention that the stationary telescopes (23, 24; 25, 26) of the front and back movable telescopes (14, 15; 16, 17) of each long side of the vehicle are realized with a common carrier (27, 28) and disposed one behind the other such that the movable telescopes emerge from the associated ends (29, 30; 31, 32) of the carriers (27, 28) (FIG. 1).

Abstract: In a vehicle (1) having a swiveling mast (12) which is built on a slewing gear (11) disposed on a frame and has associated therewith a frame support (18) including arcuate guides fixed on the vehicle for beams (19 to 22) to be drawn into the vehicle profile, the guides (31 to 34) and the beams being disposed in a horizontal plane and the guides (31 to 34) extending substantially between the longitudinal sides (35, 36) of the vehicle profile, the invention provides for the guides (31 to 34) to be disposed tangentially to the longitudinal direction of the vehicle, each extending inwardly from one of the longitudinal sides (35, 36) of the vehicle profile substantially to the center (5) of the vehicle and from there further to the same longitudinal side (35, 36) of the vehicle profile (FIG. 1).

Abstract: A control valve for viscous material pumps has a valve plate reciprocally movable in a flat housing divided in half to control the flow channels of the valve. The plate is movable in a wear shell inlaid in the housing and having covering rings along the flow channels.