Abstract: A forestry winch may include a rope drum driven by a drive motor, wherein a rope is wound up on the rope drum, wherein the rope drum is functionally connected with a brake device, wherein the brake device is in the form of a spring-loaded brake which is impinged by a spring device toward a braking position and by a hydraulic brake release pressure present in a brake release pressure line toward a release position, wherein the drive motor is in the form of a hydraulic motor which is connected by a first pressure medium line and a second pressure medium line to a multi-port control valve device controlling the drive motor, and a bypass valve device connecting the first and second pressure medium lines and is located in a connecting line connecting the first and second pressure medium lines and has a closed position and a flow position.

Abstract: A failsafe vale provides “Hole-In-The-Wall” failsafe functionality for thin-wing aircraft control surface actuation systems having a geared rotary actuator powered by a hydraulic rotary motor. The failsafe valve is associated with the hydraulic rotary motor and mechanically connected to the control surface, and enables the flight control surface to return to an aerodynamically neutral failsafe position if electrical control and/or hydraulic pressure is lost. When the failsafe valve receives a normal command pressure from the hydraulic system, the valve is inactive and the actuation system operates normally. However, if there is a loss of electrical command capacity to control hydraulic valves and/or a loss of hydraulic pressure, the failsafe valve is activated and connects one of the motor hydraulic control lines to the case return line for the motor if the control surface is away from its failsafe position.

Abstract: The present disclosure relates to a hydraulic system including a variable displacement hydraulic motor for lifting and lowering a load. The hydraulic motor has a high operating speed and a low operating speed. The system also includes an actuator for controlling whether the hydraulic motor is operating at the high or low speed, and a pressure sensor for sensing when a system pressure corresponding to the hydraulic motor exceeds a threshold pressure value. The system further includes a speed control system that controls the actuator such that the hydraulic motor is prevented from operating at the first operating speed when the system pressure exceeds the threshold pressure value.

Abstract: Provided is a hydraulic drive apparatus for working machine capable of preventing an excessive pressure reduction on a meter-in side and moving a load in a lowering direction at a stable speed requiring no counter balance valve. The apparatus includes a hydraulic pump, a hydraulic actuator for lowering the load, an operating device, a hydraulic circuit including a meter-in flow passage, a meter-out flow passage and a regeneration flow passage, a control valve, a meter-in-flow-rate controller for controlling a meter-in flow rate, a meter-out-flow-rate controller for controlling a meter-out flow rate to one not lower than the meter-in flow rate, a back pressure generator located downstream of the regeneration flow passage in the meter-out flow passage, and a meter-out-flow-rate limiter. The meter-out-flow-rate limiter minimizes a flow passage area of the meter-out orifice when a pressure in the meter-in flow passage falls to or below a permissible pressure.

Abstract: A pipelayer includes a pilot pressure control unit. The pilot pressure control unit supplies hydraulic fluid to a pilot port of a warm-up control valve so that the warm-up control valve enters an open state when a winch control valve is in the closed state. The pilot pressure control unit drains hydraulic fluid from the pilot port of the warm-up control valve so that the warm-up control valve enters the closed state when the winch control valve is in the open state. The stroke amount from the stroke end of the closed side of the spool of the warm-up control valve when the meter-out opening of the warm-up control valve is fully closed is larger than the stroke amount from the stroke end of the closed side of the spool of the winch control valve when the meter-in opening of the winch control valve is fully closed.

Abstract: A warm-up pilot pressure control unit adjusts pilot pressure inputted to a first flow channel open/close unit so that the flow channel open/close unit is switched to an open state when a warm-up start state is entered under the necessary condition that a first winch operation member is in a neutral position. When the first flow channel open/close unit is in the open state, a first pump displacement adjustment unit adjusts the displacement of a first hydraulic pump so that the differential pressure between a first pump hydraulic circuit and a first warm-up hydraulic circuit becomes constant at a predetermined set pressure.

Abstract: An air hoist, also referred to as a winding machine, includes an air motor with a manifold thereon, a valve plate and an operating valve. The air motor includes a reversably rotatable drum about which an elongated load-carrying element, such as a chain or cable, is wound to permit lifting or lowering of a load. The drum is driven in either a clockwise or counterclockwise manner, thereby causing lowering or lifting, by fluid pressure supplied by a pneumatic or air supply. The lowering or lifting is controlled by fluid direction through the manifold, valve plate and operating valve which is controlled by the position of the operating valve. The manifold, valve plate and single operating valve being of a unique design and configuration.

Abstract: A seat belt retractor with a ball type pretensioner including a pipe in which the balls are retained. A front end portion of the pipe is securely retained so that reliable operation of the pretensioner is provided. The pipe does includes a cut-out that does not extend to the front-most end of a pipe. A guide block is fitted in the front-most end of the pipe. The pipe and the guide block are fixed to the plate together by a fastener. The portion where the guide block is fitted to the pipe can provide high rigidity and is thus hardly deformed in every directions. The fastener may be hardened or the material for the fastener may be selected to obtain sufficient strength.

Abstract: A rotary tightening device for a safety belt has a belt retractor including a housing and a belt take-up shaft rotatably supported in the housing. The belt-take-up shaft has one end of the safety belt connected thereto. Upon triggering of the rotary tightening device, the belt take-up shaft is rotated in a belt take-up direction of the safety belt. A drive wheel is connected to the shaft. The housing has a channel extending in a plane parallel to a radial plane of the drive wheel and extending at least partially about a circumference of the drive wheel. Mass bodies are positioned loosely adjacent to one another in the channel. The mass bodies, when accelerated, act on the drive wheel for driving it. The drive wheel has at the circumference a gearing in which the mass bodies are received for driving the drive wheel. A spacing of the gearing is substantially identical to a spacing between the mass bodies.

Abstract: A winch system comprising a cable drum coupled with a reversible hydromotor and a reversible hydropump arranged with the hydromotor in a closed circuit by means of two communication conduits, in which a safety circuit connecting the communication conduits with one another at the occurrence of pressure shocks therein is arranged and provided with one controllable relief pressure valve, whose inlet and outlet are connected with each one of the communication conduits through non-return valves allowing supply to and, respectively, drainage from the relief pressure valve.

Abstract: A vane for a convergent-divergent nozzle is constituted by a central body d a base plate. The central body comprises a reinforcement substantially in the shape of an isoceles triangle and of channel section, the reinforcement having internal and external edge flanges and a cover plate of the same shape and dimensions as the reinforcement, the reinforcement being secured to the flanges of the latter.The base plate is rectangular and has a triangular opening of a contour corresponding to that of the reinforcement. The central body is secured to the base plate by securing means constituted by a profiled member of a shape corresponding to that of the opening.The central body is of a composite carbon-carbon material; the base plate and securing means, of steel.

Abstract: Hydraulic system for operation of winches which are associated with powered friction pulleys for hauling a wire, the winch winding the wire onto the drum being provided with valves permitting the friction pulleys to idle freely when it is convenient to use the winch drum proper also for hauling the wire.

Abstract: A two speed valve and bi-directional motor system is provided having a pair of motors, means for delivering pressure fluid selectively to either side of said motors, a two speed valve means receiving fluid on one side of said motors to selectively direct the fluid to one or both motors to provide high or low speed operation thereof and flow sensing means automatically connecting the discharge from the motors to the one motor not receiving fluid when the two speed valve is shifted to divert all fluid to one motor so that fluid is recirculated through said motor.

Abstract: Hydraulic system for operation of a winch, including a hydraulic motor for operation of the winch, a pump for pumping hydraulic oil for operation of the motor, a manoeuvering valve for control of the speed of the motor and rotational direction, a first choke valve which is connected in series with the pump, and a second choke valve which is connected in parallel with the motor, the system including two or more hydraulic motors connected in parallel, with throughflow both ways, preferably of the multi-stage type, and drive-connected to the same winch shaft.

Abstract: A hydrostatic winch having a hydraulic drive system with a dual control valve which adjusts pressure in control lines for varying the speed of lowering and hoisting a load and a brake for stopping the load has an overspeed control system which includes first valve means for relieving pressure in the control lines and first valve control means which opens the valve to automatically slow the speed of the winch when the load is moving too fast and a fail safe system for smoothly stopping the load, if necessary, which includes a braking system having a normally "off" brake which is biased towards an "on" position but which is held in the "off" position by a hydraulic cylinder.

Abstract: A nonlinear hydraulic pump control provides a primary control output as a mechanical actuator arm displacement either side of a neutral or "Off" position. A secondary control, also cam activated, operates in selectable offset sequence with the primary output, with the offset magnitude being selectively adjustable and effected either symmetrically about the primary control neutral position or differentially with respect thereto. The secondary control is useful in starting, stopping, or modulating accessory gear which cooperates with the pump operation, such as brake release control for a hydraulic winch to assure controlling hydraulic pressure buildup prior to brake release for both inhaul and outhaul operations where the winch cable is constantly subjected to tension loading.

Abstract: A winch system control mechanism for the simultaneous control of two winch motors includes a servo valve which is connected to an adjustable cylinder double drive pump for regulating the fluid pressure delivered from the pump to a winch motor driving a respective winch drum over which the respective cable or rope is engaged. A control means in the form of a shiftable hand lever is movable on either side of a neutral position in order to effect a heaving of the drum or a veering of the drum by regulating the position of the servo valve.

Abstract: The hoist drum of a mobile crane employs a controllable kinetics torque converter for transmitting power from a prime mover to the hoist drum. Apparatus and method are provided for controllably varying the density of the working fluid in the torque converter to regulate the capacity thereof and for keeping the variable density working fluid above a predetermined pressure level so as to prevent unwanted cavitation. The apparatus comprises means for supplying to the torque converter a working fluid comprising a mixture of liquid and gas, means for maintaining the fluid above a predetermined pressure level to inhibit cavitation in the working fluid, and means for selectively varying the density of the working fluid to selectively vary the capacity of the torque converter by varying the volumetric proportions between the liquid and the gas.

Abstract: A control for a hydraulically operated winch or the like having a hydraulically disengaged brake, a multi-speed, hydraulically controlled transmission, and a drum to be driven or braked. The control system includes means whereby the transmission is placed in neutral, automatically, whenever the brake is to be disengaged to lower a load and a control valve including a spool with small and large slots along with a drum-driven metering pump controls fast and slow lowering speeds. Emergency free fall of the load is accomplished in the valve by bypassing the small metering slot. An arrangement of an accumulator and check valves allow hydraulic disengagement of the brake even if the engine is dead and there is provided a recirculating hydraulic circuit to conserve oil in such an instance so that the accumulator volume can be minimized.

Abstract: A fluid system having a variable displacement fluid pump connected in a closed-loop fashion to a hydraulic motor-driven winch of the spool type. A directional control valve connected between the pump and motor selectively directs fluid to the hydraulic motor-operated winch to control the direction of movement thereof. The hydraulic winch is provided with a pressure responsive brake that is normally set to brake the winch and prevent its operation, while fluid under pressure communicated to the brake will release the same and permit the winch to operate. A separate source of fluid pressure is provided and selectively communicated to the hydraulic brake of the winch through a directional control valve, while a second control valve is provided for exhausting the control pressure to the reservoir in the event the main system pressure drops below a predetermined value.

Abstract: A braking system for the brake of a fluid motor including a jack for releasing the brake and two selectors for controlling the flow of working fluid to the jack. The first selector is responsive to the supply of fluid to the motor to place the jack in communication with a supply pipe and the second selector is responsive to pressure in a bleed pipe connected to the fluid supply to the motor to place the supply pipe in communication with a supply of working fluid under pressure.

Abstract: A hydraulic system for pipelayers includes a first circuit with a pump and a motor for controlling a boom and a second pump and motor for controlling a hoist with pressure-responsive control means responsive to a first pressure for permitting combining of fluid for operation of the hoist and responsive to a second pressure for preventing combining of said fluid.

Abstract: A hydraulic system having a plurality of hydraulic motors operated by fluid from a common reservoir includes means for circulating a flow of fluid from the reservoir through the housing of the motors to thereby maintain a substantially equal temperature between the motors and the fluid.

Abstract: A time saving automatic hydraulic control for that sequence in operations in which a grab excursioning out of sight of the operator, is sequentially lowered open to engage work material, closed to pick up a load, and then hoisted with its load and emptied. A logic circuit is activated to stop the lowering within an adjustable timed period after initial work engagement to provide desired penetration of the work material by the grab followed by a minimal time for grab closing to provide an adjustable constancy of loads and a positive sequential control for the lowering and hoisting modes.

Abstract: A valving arrangement for a winch motor powered by air or other pneumatic uid. The valving arrangement includes normally closed valves in the working fluid lines which are held open by air in the pilot fluid lines. In the event of a rupture or break in the pilot line, a normally closed valve is allowed to close, thereby stopping the winch and preventing it from overrunning its travel limits.

Abstract: A hoist system employing a hydraulic motor, a variable displacement reversible flow hydraulic pump for supplying hydraulic fluid to the hydraulic motor, and an electric motor employed as a prime mover for the pump has a control arrangement effective for sensing various indicia of operation as, for example, rate of speed of lifting of an associated load, failure of the hoist system power train and the lifting of maximum loads. Within the overall control arrangement means are provided for comparing the actual rate of speed of lifting to the desired or requested rate of speed of lifting with the differential thereof being directed back to the associated mechanism for varying the output displacement of said hydraulic pump for thereby modifying such output displacement in order to achieve zero differential output. Means are also provided for automatically braking the hoist drum in order to prevent the load carried thereby from dropping in the event of a failure of the said power train.

Abstract: The cable drum for the hoist cable of a hoisting device is driven by a hydraulic motor with a constant displacement that in its turn obtains drive fluid from a pump with a variable displacement. The displacement of the pump, and with that the speed and rotational direction of the cable drum, is operated by means of the rod of a piston in a double acting hydraulic cylinder, the piston being displaceable in the cylinder by means of pressure fluid, which pressure and direction of flow is adjustable by means of valves, which in their turn are operated electrically from a control lever.

Abstract: In a central hydraulic system for marine deck machinery, fixed displacement hydraulic motors are utilized to drive anchor winches and standard mooring winches, and variable displacement hydraulic motors are utilized to drive automatic mooring winches. This permits individual regulation of the line pull or tension of the mooring line of each automatic mooring winch. Variable displacement pressure compensated over center pumps are utilized to supply hydraulic fluid for operating the hydraulic motors by means of a closed loop circuit, and charging pumps are utilized to supply hydraulic fluid at charging pressure.Infinitely variable volume pressure compensated pilot operated four-way directional valves are used to regulate the flow of hydraulic fluid from the variable displacement pressure compensated over center pumps to the hydraulic motors, thereby regulating the speed of operation of each hydraulic motor and the marine deck winch driven thereby.