Abstract: A hydraulic system for powering a winch assembly of a work machine includes a hydraulic reservoir, a pump, a cooling system, a first path of travel, and a second path of travel. The first path of travel is disposed between the pump and the cooling system, and the winch assembly is powered by the hydraulic fluid moving along the first path of travel. The second path of travel is disposed between the pump and the cooling system. When the winch assembly is in an active condition, a first valve is in an open position such that the hydraulic fluid moves along the first path of travel and through the cooling system. When the winch assembly is in an idle condition, a second valve is in an open position such that the hydraulic fluid moves along the second path of travel and through the cooling system.

Abstract: A system and method for controlling an active grille shutter system for a vehicle upon startup of an associated engine includes determining if flaps of the AGS system are in a closed position upon cold-startup of the vehicle; moving the flaps to the closed position if it is determined that the flaps are not in the closed position upon cold-startup of the vehicle; and maintaining the flaps in the closed position until an engine coolant temperature (ECT) reaches a predetermined temperature that initially overshoots a predetermined continuous ECT target associated with steady-state operation of the engine. The initial overshoot of the ECT during cold-startup is configured to rapidly raise an engine oil temperature (EOT) to a predetermined continuous EOT target thereby reducing viscosity of the engine oil during cold-startup operation and increasing fuel efficiency of the vehicle.

Abstract: A hydraulic transmission apparatus having at least one declutchable hydraulic motor having radial pistons and connected via two motor ducts, and a casing duct connected to the inside of the casing. The apparatus further has clutching means that, in order to perform the clutching of the motor, are suitable for bringing a first one of the motor ducts to a “clutching” first pressure that is higher than the pressure in the casing while also making it possible to remove fluid via the casing duct. Disposed on the casing duct, the apparatus further has means for limiting the flow of fluid in said casing duct, in a manner such as to cause the pressure inside the casing to increase during the clutching operation. This apparatus enables clutching to take place gently.

Abstract: The present invention relates to a bottle jack comprising a main body and a shaft that expands or contracts, further comprising: a passage space communicating a hydraulically operated circuit with an unloading circuit through which the controlled outlet of hydraulic fluid from the hydraulically operated circuit and subsequent lowering of the shaft occur; a closure element elastically pushed towards the passage space to prevent the outlet of hydraulic fluid therethrough; a ram assembly elastically pushed in the longitudinal backward movement direction (B) with a force greater than the force with which the closure element is elastically pushed against the passage space; and a telescopic lever assembly which can be lowered by a user to operate the hydraulically operated system.

Abstract: A fluid energy distribution system having three elements; fluid energy providers; means for fluid energy distribution; and fluid drivers. The fluid energy providers input energy into hydraulic fluid as pressure and flow. This energy is passed to the means for fluid energy distribution wherein the energy from all fluid energy providers moves a set of sliding pistons to turn a connected crankshaft that converts and consolidates the converted energy as torque in the crankshaft. Another set of differently sized sliding pistons connected to the same crankshaft is used to pressurize a fluid and disperse it in its energized state to the fluid drivers according to their speed and torque demands. The routing of the various fluid volumes is done by computerized control system. The admission of the fluids into and out of the cylinders is done by independent flow controllers for each cylinder.

Abstract: There is provided a driving device for a work machine, having a closed hydraulic circuit system for driving cylinders with hydraulic pumps, the driving device making the speed of operation substantially the same in both directions of piston rod extension and contraction.

Abstract: A drive system and method includes a gearbox system, a first hydraulic motor driving a first input shaft, a second hydraulic motor driving a second input shaft, a drive pump driving the first and second hydraulic motors, and a system control for controlling the drive pump, the clutch assembly, and the first and second hydraulic motors. The gearbox system includes the first input shaft having a first input gear driving a first output gear on an output shaft, the second input shaft having a second input gear driving a second output gear disengageable from the output shaft, and a clutch assembly for engaging the second output gear with the output shaft. The clutch assembly includes a clutch to engage the second output gear with the output shaft, and a fluid access channel through a rotary manifold to provide pressurized fluid to activate the clutch.

Abstract: Hydraulic transmission circuit with N hydraulic motors, wherein each motor comprises N sub-motors, all N2 sub-motors having the same cylinder displacement. The circuit comprises one common feed duct, adapted for receiving fluid under pressure, and to which one feed sub-motor of each motor is connected; one common exhaust duct, adapted for ejecting exhaust fluid, and to which one exhaust sub-motor of each motor is connected; N serial ducts, each serial duct connecting a feed, first sub-motor to an exhaust, N-th sub-motor via N?2 interposed sub-motors, these N connected sub-motors respectively belonging to the N motors. This circuit allows tight synchronization of the N hydraulic motors.

Abstract: A hydrostatic transmission including a main pump, two main ducts serving respectfully as feed and as discharge for first and second hydraulic motors that serve to drive disposed one after the other. A bypass valve can take up a reduced-speed position in which the feed main orifices are connected to the discharge main duct, and an increased-speed position in which one of the motors is bypassed, the feed main orifice of the motor being connected to the discharge main duct via a bypass link, while the other main orifices continue to have their respective links. The apparatus further includes a constriction suitable for being activated to restrict the flow of fluid through the bypass link.

Abstract: A control system (100) for traction transmission has at least two multi capacity motors (M1, M2), which are adapted to rotate a vehicle's wheels (J1, J2) and which multi capacity motor (M1) is arranged to rotate a traction wheel (J2), and the multi capacity motor (M2) is arranged to rotate another traction wheel (J1), whereby motor parts (M1a and M2a) of partial rotational volumes of the multi capacity motors (M1, M2) can be connected in series, whereby the anti-slip is on.

Abstract: Systems and methods for efficiently operating a hydraulically actuated device/system are described herein. For example, systems and methods for efficiently operating a gas compression and expansion energy storage system are disclosed herein. Systems and methods are provided for controlling and operating the hydraulic actuators used within a hydraulically actuated device/system, such as, for example, a gas compression and/or expansion energy system, within a desired efficiency range of the hydraulic pump(s)/motor(s) used to supply or receive pressurized hydraulic fluid to or from the hydraulic actuators. In such a system, a variety of different operating regimes can be used depending on the desired output gas pressure and the desired stored pressure of the compressed gas. Hydraulic cylinders used to drive working pistons within the system can be selectively actuated to achieve varying force outputs to incrementally increase the gas pressure within the system for a given cycle.

Abstract: An end cap for a fuel injector of a turbine engine is disclosed. The end cap includes an annular first surface including a plurality of perforations. The annular first surface is exposed to a combustion chamber of the turbine engine. The end cap is coupled to an end face of the fuel injector to define an enclosed cavity. The enclosed cavity and the plurality of perforations form an array of Helmholtz resonators.

Abstract: A variable capacity pump and two variable capacity motors are connected in a closed circuit. First to fourth drive gears are fitted to motor shafts of the variable capacity motors via clutches. A first driven gear, which meshes with the first and third drive gears, and a second driven gear which meshes with the second and fourth drive gears are fitted to an output shaft. Equivalent capacities of the variable capacity motors are made different. Control is exerted such that the capacities are decreased to zero in order of equivalent capacities. To decrease the capacity of each variable capacity motor, the gear change ratio of the variable capacity motor the capacity of which has decreased to zero is changed to decrease the equivalent capacity and, at the same time, the capacity is increased to maximum. This increases the gear change ratio for the continuously variable transmission and controls acceleration.

Abstract: A control coupling of pressurized medium in a delimbing and cutting apparatus, provided for feeding members and for changing their feeding speed, said control coupling comprising at least: a first motor and a second motor that are coupled in parallel and drive a feeding member a third motor that is a multicapacity motor comprising a first half-motor and a second half-motor and that is coupled in series with the first motor and drives a feeding member; a fourth motor that is coupled in series with the second motor and drives a feeding member; first valve members that for the purpose of free rotation allow the feedback of the pressurized medium exiting the third motor to the first half-motor; and first control members that monitor the pressure of a first line and couple the first valve members to free rotation if said pressure is lower than the set value.

Abstract: A hydraulic power transmission device in a work vehicle transmits motive power from two hydraulic motors disposed in parallel to each other. The hydraulic power transmission device includes: a case; a first motor shaft and a second motor shaft respectively disposed in a right-side area and in a left-side area inside the case, each linked to one of the two hydraulic motors; a counter shaft disposed in an area ranging between the first motor shaft and the second motor shaft in the case; an output shaft; a first transmission mechanism that transmits motive power from the first motor shaft to the output shaft via the counter shaft; a second transmission mechanism that transmits motive power from the second motor shaft to the output shaft; and a hydraulic clutch device disposed at the counter shaft, that transmits the motive power from the first motor shaft to the output shaft or cuts off transmission of the motive power.

Abstract: An electrical generator having two generator components, namely a coil and a magnet. One of the generator components is attached to a fixed or buoyant pylon, and the other of the generator components is attached to a float that rises and falls in response to changes in the water level of a body of water. This causes relative motion between the two generator components and results in electrical power being generated by the coil. The buoyant pylon may be anchored by a flexible attachment to the bottom of the body of water. The float need not be coaxial with respect to the pylon. A single float may be used with more than one pylon and generator component. More than one float may be used with a particular generator component. Fixed pylons may also be used as a breakwater or as a support for a structure.

Abstract: A hydraulic circuit for heavy construction equipment to reduce a speed of a swing apparatus while a working apparatus such as a boom is concurrently operated has a work control valve which controls a working apparatus cylinder; a confluence valve which combines a hydraulic fluid of the second hydraulic pump with the work unit flow path based on a positions switch; a swing control valve which controls the hydraulic swing motor; and a disconnection valve which disconnects the hydraulic fluid supplied to at least one of the swing motors.

Abstract: A hydraulic circuit including a first motor set, and a second motor set for driving vehicle-moving means situated one behind the other. The circuit has first, second, third, and fourth main ducts for feeding the motor sets in parallel. The device includes a selector suitable for taking up a first stable position making the feeding in parallel possible by interconnecting in pairs the feed and discharge main ducts, and for taking up a second stable position in which one of the motor sets is inactive because one of the main ducts is connected to one of main ducts of the other set. Between the stable positions, the selector can take up a temporary position, in which all four main ducts are interconnected. At least while the selector is moving in one direction between its two stable positions, the temporary position is sustained in an intermediate stage during which at least one of the interconnections between the main ducts of the first and second motor sets is constricted.

Abstract: With a hydrostatic multi-motor drive unit with a least two hydraulic motors acting upon a common load, a solution should be created, with which a further operating range is covered by the use of several motors and at the same time a simple as possible and problem free coupling of the motors is assured. Furthermore, a method for controlling the drive unit is indicated, which permits continuous transitions between the different operating ranges. This is achieved in that the motors (2, 3) are connected with each other through at least one freewheel device (4), in which the motor (2) arranged after the freewheel device has a variable displacement volume.

Abstract: A vehicle includes an integrated drive module coupled to an axle thereof. The module includes a hydraulic motor configured to provide motive power at an output shaft, and a differential for distributing the motive power to right and left portions of the axle. The hydraulic motor and the differential are encased within a common housing. The vehicle may include a second integrated drive module having, within a housing, a second hydraulic motor (or multiple hydraulic motors), and a second differential coupled thereto and configured to distribute motive power to right and left portions of a second axle. The second module may also include a transmission within the same housing. The transmission may be a two speed or other multi-speed transmission. The second module is configured to operate in neutral while power demand is below a threshold, and to engage while the power demand exceeds the threshold. The second module may be configured to remain engaged for full-time four-wheel-drive operation.

Abstract: A hydraulic control circuit for a radial piston engine with two speeds. The changeover between the speeds takes place through the alteration of the absorption volume, the delivery side being connected to the discharge side with a bypass connection by a valve arrangement for a selected number of engine pistons. The control circuit provides a space-saving way of ensuring that the changeover between speeds occurs smoothly and in such a manner to preserve the individual components as far as possible. To this end, at least one intermediate switching position, in which the delivery side is throttled to the discharge side, i.e. connected by a diaphragm-type arrangement, is provided in front of valve arrangement between the two end switching positions. The valve arrangement is preferably driven such that a valve body can be moved through the intermediate switching position at a controlled speed.

Abstract: Automatic transmission, comprising at least one primary hydraulic pump (1) arranged to be powered by a motor, said primary pump (1) being arranged to power a number of at least two secondary hydraulic pumps (21-2n) which are mechanically connected to an outgoing propeller shaft (6), the secondary hydraulic pumps being arranged for active powering of said outgoing propeller shaft when the hydraulic pressure caused by the primary pump in a closed room (A) between the primary pump and the secondary pumps, reaches predetermined levels which are different for the various secondary pumps (21, 22 and . . . 2n respectively).

Abstract: The invention relates to a hydrostatic drive (1) with a hydraulic pump (2) and a first hydraulic engine (10) that is linked with the hydraulic pump (2) via a first working line section (4), the hydraulic engine driving a first drive train (11). The hydrostatic drive further comprises a second hydraulic engine (14) that is linked with the first hydraulic engine (10) via a second working line section (5), the second hydraulic engine driving a second drive train (15). The second hydraulic engine (14) is linked with the hydraulic pump (3) via a third working line section (6). According to the invention, an on-off valve (8) is located in the first working line section (4) and the second working line section (5). When a slip arises at the first drive train (11), said on-off valve can link the first working line section (5) with the second working line section (5) directly, that is while by-passing the first hydraulic engine (10).

Abstract: The invention relates to a hydrostatic traveling mechanism (1) which comprises a hydraulic pump (4), a first hydraulic engine (8) that is linked with the hydraulic pump (4) via a hydraulic work circuit (2) and that drives a first drive train (17). The traveling mechanism further comprises a second hydraulic engine (10) that is linked with the hydraulic pump (4) via a hydraulic work circuit (2) and that drives a second drive train (19). The inventive traveling mechanism is also provided with a third hydraulic engine (23) that is coupled with the first drive train (17) and a fourth hydraulic engine (24) that is coupled with the second drive train (19). The third hydraulic engine (23) and the fourth hydraulic engine (24) are linked with each other via a hydraulic secondary circuit (3) that is independent of the work circuit (2).

Abstract: A hydraulically operated fan for a cooling system in an automotive vehicle. Two hydraulic motors drive a common fan shaft. A control system provides means to bypass flow in parallel with both motors or direct flow to both or one of the motors dependent on inlet flow and cooling signal conditions.

Abstract: The present invention includes a hydrostatic transmission system that has a control device that is selectable to send a speed signal to a motor for driving an output at a predetermined speed. A controller is used to automatically permit the selected speed signal in response to a predetermined speed signal and predetermined input from a sensing device indicating that the output is being driven in a forward drive condition. The controller is also used to automatically override the selected speed signal in response to a predetermined speed signal and predetermined input from a sensing device indicating that the output is being driven in a reverse drive condition. This invention allows for the speed of the motor to be changed from a high speed to a low speed when the motor is driving the output in a reverse drive condition to achieve greater efficiency and control of a work machine.

Abstract: A hydraulically operated fan for a cooling system in an automotive vehicle. Two hydraulic motors drive a common fan shaft. A control system provides means to bypass flow in parallel with both motors or direct flow to both or one of the motors dependent on inlet flow and cooling signal conditions.

Abstract: The present invention is a control circuit for a construction machine for using a control lever for revolving and boom swing in common and switching pilot pressure via a switching valve, comprising: a switch for supplying a switching signal to the switching valve; a pressure switch for detecting whether the pilot pressure is output from a remote control valve or not; a switching control circuit for switching a position of switch to a position for a boom swing cylinder when the switching signal is output from the switch and holding the position of switch at the position for the boom swing cylinder when the pilot pressure is detected by the pressure switch, to thereby prevent wrong operation in switching.

Abstract: An apparatus, for controlling a plurality of hydraulic motors and a clutch for driving a drive shaft, can prevent a speed change shock and a load slip of a hydraulic motor as well as making a structure simple. The apparatus includes: a first volume variable hydraulic motor (1), connected to the drive shaft (3) through the clutch (5); a second volume variable hydraulic motor (2), which is always connected to the drive shaft (3); first tilt rotation control means (7, 8), for controlling a tilt rotation amount (a discharge volume cc/rev) of the first hydraulic motor by receiving a drive side pressurized oil (Pac) of the first hydraulic motor; and a zero tilt rotation holding means (10, 10A), for holding the tilt rotation amount of the first hydraulic motor at substantially zero in a state wherein the tilt rotation amount of the first hydraulic motor is controlled to be substantially zero.

Abstract: A hydraulically powered fan system for the cooling system of a vehicle. Two hydraulic motors, powered by a hydraulic pump, drive a common fan which cools a radiator. When hydraulic flow in excess of that required to power a single motor is present, a second motor is placed in parallel with the single motor, thereby reducing system pressure, and reducing the power consumed by the pump.

Abstract: Pressurized fluid motor comprising a casing, a cylinder block, a cam, an internal fluid distributor and a selector. The bore of the selector has four grooves. Two of them are communication grooves each connected to a main (feed or exhaust) power duct and to a connection duct, the connection ducts being themselves connected to different groups of distribution ducts. The other two grooves of the bore are branch grooves respectively connected to an additional (feed or exhaust) power duct and to a third connection duct. The slide of the selector comprises at least a first selection groove which is adapted to establish communication between the two branch grooves. By modifying only the shape of the slide, and possibly that of the bore of the additional duct, the selector can provide different functions.

Abstract: A hydraulically powered fan system for the cooling system of a vehicle. Two hydraulic motors, powered by a hydraulic pump, drive a common fan which cools a radiator. When hydraulic flow in excess of that required to power a single motor is present, a second motor is placed in parallel with the single motor, thereby reducing system pressure, and reducing the power consumed by the pump.

Abstract: The method for preventing the interruption of tension during connection and disconnection of a first hydraulic motor to and from the power train of vehicles, in particular loaders, consists in that during the disconnection of the first hydraulic motor the high-pressure line is connected with the low-pressure line thereof, a flow distributor is readjusted so that the amount of oil fed to the first hydraulic motor is not increased, the pressure on a second hydraulic motor not to be disconnected being raised to a new value which remains constant during the disconnection, of the first hydraulic motor, a pump is readjusted to the new required (reduced) flow rate; and after adjustment of the pump to the new flow rate, the connection of the high-pressure line with the low-pressure line of the first hydraulic motor is eliminated; and during the connection of the hydraulic motor said method steps are carried out in reverse sequence.

Abstract: A conveying system (43) is disclosed including a vertical auger (27) which receives material from a horizontal auger (25). The vertical auger is driven by a hydraulic motor (37) and the horizontal auger is driven by a hydraulic motor (35). A pressure response valve (89) responds to a pressure signal (93), representative of the load on the motor (37) driving the vertical auger to unload or bypass the motor (35) driving a horizontal auger. As the load on the vertical auger decreases, the valve (89) gradually communicates more flow to the motor (35) driving the horizontal auger, thus feeding more material (grain) to the vertical auger.

Abstract: The invention concerns a dual-capacity hydraulic motor. In accordance with the invention, the capacity selector device comprises two valves each having a body with two grooves and a sliding slide valve with only one groove. One application is to the implementation of a low-cost, lightweight motor that is compact in the axial direction.

Abstract: An apparatus for operating feed bars to move a workpiece between stages of a pressing machine includes cylinder devices. Each of the cylinder devices serves to move the feed bars linearly and each has a respective absolute encoder. The cylinder devices include a feed cylinder device which is responsive to hydraulic pressure to linearly advance and return the feed bars. First and second clamp cylinder devices are responsive to hydraulic pressure to move the feed bars linearly so as to clamp and unclamp the workpiece between the feed bars A hydraulic pressure supply circuit is connected commonly to each of the cylinder devices. Hydraulic pressure is applied to the cylinder devices through respective servo valves of a hydraulic valve arrangement.

Abstract: A hydraulic base-load motor (M1) drives a load with the working pressure generated at the motor rising with the load. When the working pressure reaches an upper limit pressure, a hydraulic stand-by motor (M2) is switched on. Since the pressure drops upon switching on the stand-by motor, the control device is designed such that, upon reaching a lower limit pressure, it deactivates the stand-by motor again, the lower limit pressure being less than half the upper limit pressure. This switching hysteresis prevents a repeated switching over of the stand-by motor.

Abstract: A hydrostatic drive system having valving which disengages power to selected drive wheel motors in response to a sensed lack of traction, while the driven vehicle is in motion. The valving also allows communication of fluid between the inlet port of one drive wheel motor and the outlet port of another, in response to the decoupling of one of the motors in order to prevent an abrupt transition.

Abstract: An automatic speed changing apparatus, employable for a motorcar, which includes a hydraulic pump on the driving side mounted on a driving shaft, a plurality of hydraulic motors on the driven side mounted on a driven shaft, a distributor including a cylinder and a piston slidably received in the cylinder, a hydraulic oil collecting pipe having a large diameter in which working hydraulic oil is stored for the hydraulic pump and motors on both the driving and driven sides, an idling lever pivotally supported in the cylinder to be operable during a period of idling and a piston lever for displacing the piston axially in the cylinder during normal operation and during a period of engine braking.

Abstract: A radial piston hydraulic motor includes an in-board computer which permits monitoring and control of various operating parameters. A position code disc is associated with the shaft of the motor by means of which the position of the drive cam on the shaft, relative to the individual piston can be sensed and fed to the computer. The motor is of high versatility and performance.

Abstract: A dual hydraulic motor system where motor wobblers are mechanically linked and the motor outputs are torque summed, is controlled by a three position dual valve assembly. Each valve assembly is controlled by pilot pistons that are mechanically linked to provide three functions, one being normal operation, a second where one motor must be shut-off and its load on the system is minimized and the third where both motors are shut-off and significant drag is then provided. These functions are implemented by a separate spool in each valve which has three independent stable positions.

Abstract: A hydraulic-control system for a hydraulic press utilizes a main power unit consisting of a pump and a flywheel which delivers the energy necessary for a working stroke to at least one cylinder of the press. An auxiliary power unit consisting of an electric motor and another pump driven thereby is connected to the hydraulic network to drive the first mentioned pump as a motor and rotate the flywheel to increase the energy stored therein.

Abstract: Check device for a redundant flight control apparatus comprising at least two servo drive devices. Failure in supplying fluid and wedging of a control valve (20) can be simulated. Failure of the bypass valve (35) can be checked by reading and comparing the volume flows of the respective pumps as well as by evaluating the travelling rate of the servo drives (1, 2) by the pilot.

Abstract: Two pistons (5, 8) are mounted in the same casing (1) so as to slide in a sealed manner, the two pistons (5, 8) being firmly fixed to one another and having corresponding actuating chambers (21, 22; 23, 24) which are separated from one another and are supplied sequentially by two distribution valves (A, B) which are situated in the casing (1) and are actuated by the input shaft (14). The second piston (8) is formed by an extension (7) of the first piston (5) and its corresponding actuating chambers (22, 24) are formed in the piston structure (5, 8) and by a housing (4) in the casing (1), respectively, the housing (4) being coaxial with the main housing (3) for the first piston (5). The two valves (A, B) are advantageously of the type having a star-shaped rotor (30, 40).

Abstract: A two-speed, pilot-operated selector valve which directs hydraulic fluid to two motor elements with a common output shaft to obtain a high-torque, low-speed mode, or to one motor element, while recirculating the second element in a loop, to obtain a low-torque, high-speed mode. The spool has a built-in logic mechanism which, while shifting from one position to the other, prevents any momentary condition where a motor discharge port is blocked or a fluid path exists that bypasses both motor elements.

Abstract: A cartridge type directional control valve assembly includes an elongated housing having a bore and a plug threaded in the outer end of the housing adjacent the bore. A changeover, spring biased piston forming a load senser or pressure sensor is provided in the bore with a sealing O ring therebetween. A coil spring is interposed between the plug and the changeover piston. The plug has a vent passage for venting the chamber of the coil spring. A valve retaining screw located in the housing, is centrally apertured and loosely receives the shank of the cone or flow control valve. A coil spring is nested within the valve retaining screw and bears against the flow control valve which is normally seated with respect to a central aperture within the cone valve insert seat. A floating ball check valve is nested within the cartridge assembly and is axially aligned with and opposite from the flow control valve. The control valve and ball check valve control flow across their respective valve seats.

Abstract: A system for limiting the torque of a multiple hydraulic system power drive unit wherein plural hydraulic motors are connected to a common torque-summing output device. The system has at least two separate hydraulic circuits, with there being a pressure-limiting valve in each circuit which controls the porting of motor pressure to a low pressure return line and which sums the motor pressure existing in the fluid circuit in which the valve is positioned and the pressure in the other hydraulic circuit whereby the maximum pressure of the fluid delivered to the motor cannot exceed one-half the maximum pressure when both circuits are active to limit the torque applied to the torque-summing output device.

Abstract: An extracting screw apparatus comprises a hydraulic control which operates during starting of the extracting screw after a period of nonuse. The hydraulic control comprises a double-acting hydraulic actuator having a piston rod connected to an intermittent drive such as an overrunning clutch for rotating a driving shaft for the extracting screw about its axis. The intermittent drive converts linear reciprocating movement transmitted by the hydraulic actuator into intermittent angular movement. A hydraulic motor alone insures rotation of the extracting screw about its axis after starting and also insures the sweep movement of the extracting screw about a vertical axis. A hydraulic control circuit connected between a line running from a pump to the hydraulic motor for cutting off hydraulic fluid to the double-acting hydraulic actuator after normal operating torque is reached.

Abstract: A sluing mechanism driven by one or more electric or hydraulic motors, for excavating or bulk handling machines comprises a pivotable discharger boom mounted on a rotary support or turntable, and a coaxially pivotable superstructure carrying further equipment. The sluing drives of the two coaxially pivotable parts of the machine are connected to each other in such a way that upon pivoting the superstructure, the discharger boom does not follow this pivotal motion. The sluing drive of the discharge boom is designed as a superposed gear and connected to a drive motor for separately sluing the discharger boom. The turntable is provided with a second discharger sluing gear which is driven by a motor having a weaker characteristic than the drive motor or motors for sluing the superstructure. The characteristic of the motor driving the second discharger sluing gear may be adjustable.

Abstract: A multiple speed hoisting system has a first fluid circuit, with a maximum effective cross-sectional area for hoisting heavy loads at low speed, and a second fluid circuit, with a smaller effective cross-sectional area for hoisting lighter loads at higher speed. These circuits are separately actuated by a valve that is responsive to a regulating means for selectively positioning the valve. A pressure operated control, that is in flow communication with the second fluid circuit, automatically cancels the influence of the valve regulating means, in response to a predetermined pressure level in the second fluid circuit, and allows the valve to revert to a position actuating the first fluid circuit. Undesirable oscillations within the system between the pressure operated control and the valve regulating means are avoided.