Abstract: A vehicle crane having a boom that can be luffed between a storage position and a working position within a vertical luffing plane by at least two luffing cylinders The luffing cylinders that lie opposite one another on the luffing plane, enclosing a spread angle between their longitudinal axes in the working position, and the luffing cylinders acting on the boom outside its ends. The longitudinal axis, projected onto the luffing plane, of one luffing cylinder and a vertical direction extending within the luffing plane enclose an angle of inclination there between when the boom is in the storage position to achieve a compact design, particularly when the boom is in the storage position.

Abstract: Control device for operating at least one actuator of a vehicle, the control device comprising a deflectable control lever and a housing module, wherein a first guide element rotatable about a first rotation axis and a second guide element rotatable about a second rotation axis are provided, wherein the first guide element is arranged at a first end of the control lever and the second guide element is arranged between the first end and a second end of the control lever, wherein the housing module has through holes, which are designed as bearing for supporting the guide elements, so that the guide elements can be contacted from outside the housing module, wherein the housing module has a first coupling area on an outer side, wherein the first coupling area comprises a bearing of the bearings and the first coupling area is designed and provided to receive an additional module, which comprises an area formed at least partially complementary to the first coupling area, in such a way that the additional module can

Abstract: A stump grinder has a grinding arm that durably mounts a rotatable grinding wheel by securing the drive shaft of a motor to the grinding wheel such that a pair of bearings within the motor support one side of the grinding wheel and by supporting the other side of the grinding wheel with a stub shaft received within a third bearing. The grinding arm is laterally offset on the frame of the stump grinder to have a swing angle that is not symmetrical relative to the width of the frame, but with the swing angle starting at one side of the frame and then traversing across substantially the entire width of the frame to improve the ability of the operator to see the grinding wheel. A single joystick is movable in orthogonal directions corresponding to desired up and down and side-to-side pivoting motions of the grinding arm. The joystick includes a depressible trigger for starting and stopping the operation of the grinding wheel.

Abstract: A dock building apparatus comprises a cantilever arm (11) having a first portion configured to be supported on a ground area and a second portion for overhanging a construction area. The cantilever arm (11) is displaceable perpendicularly to the length of the cantilever arm. The apparatus further includes a lifting device (19) movable along the cantilever arm for bringing construction materials including foundation members from the ground area to the second portion of the cantilever arm, and a foundation building tool (15) movable along the cantilever arm for installing the foundation members in the construction area.

Abstract: An extension boom system for heavy equipment having, the extension boom system including a first actuator mounted on a base, and connecting a second stage, a second actuator mounted on the second stage and connecting the second stage to a third stage, a third actuator mounted on the third stage and connecting the third stage to an extendable portion, and a controller configured to control the first actuator, the second actuator, and the third actuator so as to selectively operate in a first operation mode and a second operation mode. In the first operation mode, the first actuator, the second actuator, and the third actuator are operated substantially simultaneously, and wherein in the second operation mode, two of the first actuator, the second actuator, and the third actuator are actuated substantially simultaneously, while another of the first actuator, the second actuator, and the third actuator is not actuated.

Abstract: Disclosed is a raisable-lowerable member which comprises a boom and a jib. The boom comprises a first supporting portion configured to rotatably support a jib foot when the jib is set in a protruding posture; and a second supporting portion configured to rotatably support a supportable portion of the jib when the jib is set in an enfolded posture. A position adjusting and holding unit of the jib is configured to couple, to the frame, a specific site of the second link in such a manner that a relative position of the second link with respect to the frame in a rotational direction of the second link is adjustably changed to allow the rotational axis of the second joint portion to become coincident with the rotational axis of the jib foot, and to hold the second link at the changed relative position.

Abstract: The invention relates to an electro-hydraulic leak compensating device for a mobile crane lowering brake system in an open hydraulic circuit with a hydraulic motor (5) coupled with a lifting unit (6,7), a lowering brake valve (4) and a mechanical brake (9), with a pressure sensor (13) which measures the hydraulic pressure prevailing on the load side of the hydraulic motor (5) in the hydraulic circuit and on the side of the lifting conduit (3) before the mechanical brake (9) is closed, in particular immediately before it is closed, as well as a method of electro-hydraulically compensating for leaks of a mobile crane lowering brake system in an open hydraulic circuit with a hydraulic motor (5) coupled with a lifting unit (6,7), a lowering brake valve (4) and a mechanical brake (9), comprising the following method steps: measuring the hydraulic actual pressure prevailing on the load side of the hydraulic motor (5) before the mechanical brake (9) is closed, in particular immediately before it is closed; determ

Abstract: A gantry crane (10) is configured in a panel turner application. The gantry crane (10) generally includes a gantry crane structure (14) having a first cross-beam (28) and a second cross-beam (30). A first main hoist mechanism (40) and a first auxiliary hoist mechanism (42) are coupled to the first cross-beam (28), and a second main hoist mechanism (44) and a second auxiliary hoist mechanism (46) are coupled to the second cross-beam (30). The crane (10) includes a hydraulic system configured to reduce the lift capacity of the first and/or second main hoist mechanism (40, 44), and to equalize the hoist capacity between the first and second main hoist mechanisms (40, 44) or the first and second auxiliary hoist mechanisms (42, 46) in certain applications. The auxiliary hoist mechanism (42, 46) are configured for powered movement along the respective cross-beams (28, 30).

Abstract: The present disclosure relates to a telescopable sliding beam comprising a sliding beam box and at least one first and one second sliding beam, which are telescopable into each other, the first sliding beam being mounted in the sliding beam box such that it can be telescoped out, where at first the first sliding beam can be telescoped out, and after the same has telescoped out to a desired point, the second sliding beam can be telescoped out, whereas during backward retraction, the second sliding beam can first be retracted to a desired point and subsequently the first sliding beam can be retracted.

Abstract: The invention relates to a method for determining a present value of the capacity level of a hydraulic crane (1) provided with a lifting cylinder (8), the present value of the capacity level being determined by means of a processing unit (33). The initiation of each new lifting cycle of the crane is detected and a minimum value of each lifting cycle is registered, which represents the lowest hydraulic pressure on the piston side (8a) of the lifting cylinder during the lifting cycle or the lowest cylinder force of the lifting cylinder during the lifting cycle. For at least some of the lifting cycles, the processing unit (33) determines the present value of the capacity level of the crane taking into account a control value (Vc) corresponding to: the minimum value registered for the previous lifting cycle, or the lowest one of the minimum value registered for the previous lifting cycle and the minimum value registered for the present lifting cycle.

Abstract: The frame of a vehicle body is constituted by left and right vertical plates and a bottom plate coupling the vertical plates horizontally. In addition, a control valve device and a control valve device including a plural number of directional control valves are mounted in advance on a single mounting plate together with a correction lever, a plural number of operation levers and link mechanisms to obtain a lever/valve assembly. Then, the mounting plate constituting of the lever/valve assembly is attachable to or detachable from the left vertical plate of the frame by using bolts or the like. As a result, the efficiency of the assembly operation can be improved.

Abstract: A pipelayer is provided which is capable of effectively transporting pipes or the like and stably carrying out load hoisting operation on a slope. The pipelayer comprises: an undercarriage; an upper revolving superstructure mounted on the undercarriage so as to turn around freely upon the undercarriage; a boom supported by the upper revolving superstructure so as to be freely raised and lowered; a pulley block attached to the boom through a universal joint; a hoist mounted on the upper revolving superstructure; a hoist hook hung by a wire rope that is paid out from the hoist and wound around the pulley block.

Abstract: A method for synchronously retracting and extending a jib of a crane having a plurality of telescoping lengths, preferably in a vehicle crane, extending and retracting being with driving means which is one of a hydraulically-driven, multistage telescoping cylinder and a plurality of single-stage telescoping cylinders operated in parallel.

Abstract: An assembly is provided that enables the operation of all hydraulic sidebooms to be achieved while simultaneously inherently avoiding commonly recurring problems attributable to inadvertent contact between the hook block and the upper block or to an impending tipping condition. Application of joystick technology is provided to enable simultaneous manipulation of the boom and load, wherein a long-established, routinely-accepted combinatin of two to three controls is replaced by a single joystick control. A fail-safe thumb actuator is also provided for a single joystick control. An anti-contacting feature is provided that stops the upward travel of the hook block if it is about to come in contact with the sideboom's stationary upper block, and thus preventing consequent damage that wound result if contact took place.

Abstract: An electro-hydraulic operating system for an extensible boom includes one or more hydraulic cylinders for imparting relative motion between the boom sections to retract the boom according to an electronically stored program of sequences of movement and speeds. A source of pressurized hydraulic fluid is fed through appropriate control valves which include solenoid valves in fluid communication with a source of pressurized hydraulic fluid. The solenoid control valves are supplied with control currents proportional to the desired flow rates of fluid to the hydraulic cylinders in order to achieve speed and position control according to the stored program. A metering valve structure is provided for operation in conjunction with the solenoid control valves.

Abstract: Arrangement for a goods hoist which has an operating control capable of being actuated by a driving device and is situated between a load device and the driving device. The driving device is controlled by electronics that communicate with a transmitter contained in an operating controller.

Abstract: An apparatus and a method for controlling the operation of a reach tower crane, in which a horizontal boom can safely and securely be operated or stored by one operator in the cab, and in which even if sensors are out of order, the stability of the crane can be secured. The system has a plurality of sensors for detecting a condition of an actuator (6) actuating an apparatus to operate or store a horizontal boom (5), a controller (36) for sending a control signal based on signals from the sensors, and hydraulic apparatuses for controlling various actuators in accordance with the control signal. Further, an operation lever and an operation switch are used to extend or store the horizontal boom (5).

Abstract: The invention is a small, maneuverable, tracked vehicle capable of being equipped with a tool such as, but not limited to, buckets, diggers, tree spades, trenching devices, and augers. The vehicle is small and light enough to enter and be used in places, such as residential yards, in which traditional vehicles with buckets and digging tools, because of their size and weight, cannot be used or other places where flotation is a concern. The preferred vehicle has four outriggers to stabilize the vehicle during use, the outriggers arranged at an angle to a longitudinal axis of the vehicle.

Abstract: The invention is a small, maneuverable, self-propelled tracked vehicle equipped with a boom having a tool attached to an extendable section of the boom. The vehicle is small and light enough to enter and be used in places, such as residential yards, in which traditional vehicles with buckets and digging tools, because of their size and weight, cannot be used. A three-stage gear pump powers the tracks and the boom on the bucket or digger. The vehicle has four outriggers to stabilize the vehicle during use, the outriggers arranged substantially perpendicular to each other and at angles of approximately forty-five degrees from the longitudinal axis of the vehicle.