Abstract: The invention relates to a balancer (1) for raising, holding and lowering a load, comprising a cable drum (7) which can be rotated in a manner actuated by pressure medium and has a cable for bearing the load, which cable can be unwound from and wound onto said cable drum (7), and has a device for emergency braking of the cable drum (7) if a defined rotational speed is exceeded, which device for emergency braking comprises at least one locking element (16) which is fastened to the cable drum (7), is held in a freewheeling position in a spring-loaded manner and can be moved into a deployed locking position in a manner which is actuated by centrifugal force, in which locking position the rotation of the cable drum (7) is blocked by virtue of the fact that the locking element (16) is in engagement with a stop which is stationary relative to the cable drum (7).

Abstract: Hydraulic powered assemblies 10 and 110 are disclosed. The assembly 10 includes a support unit 12, a hydraulic motor 14, and a driven member 16 that is integral with the hydraulic motor 14. The hydraulic motor 14 includes a power group 32 that includes six gerotor power units 34a-34f. Each gerotor power unit 34a-34f includes an inner rotor 40 that is fixed to a stationary through-shaft 24 and an outer rotor 42 that is mounted for hypocycloidal movement relative to the inner rotor 40. The driven member 16 includes segments 51 that support the outer rotors 40 within the segments 51. The segments 51 carry a winch cable receiving member 60 when the assembly 10 is used as a winch. The hydraulic powered assembly 110 is an alternative embodiment that includes two power groups 131 and 132. The power groups 131 and 133 may be symmetrical or asymmetrical.

Abstract: An apparatus (10) for remotely running a subsea production tree (12) and desuspending a well is described. The apparatus comprises a tree running tool (16) adapted to be connected to a production tree, at least one downhole tool, at least one of the tools being a plug retrieval tool (22) and a tool deployment device (18) in hydraulic communication with at least the plug retrieval tool to hydraulically operate the plug retrieval tool.

Abstract: A manipulator for a load has a stand, an accommodation connected to the stand (2, 8) for the load, wherein the accommodation allows movement of the load with respect to the stand with respect to at least a first axis, a drive having a rope pull or a chain or belt drive which supports the movement of the load along the first axis, and an elasticity means acting along the first axis. The elasticity means has a frame translationally displaceable along the first axis with respect to the stand and elastically retained which supports a guiding element of the drive.

Abstract: A hoisting machine having a load hoisting motor and a speed reduction mechanism and driving the load hoisting motor with an inverter 12 incorporated in the hoisting machine main body is provided with a heat dissipation means that dissipates heat generated from the inverter 12 to a speed reduction mechanism casing 15 that houses the speed reduction mechanism. The heat dissipation means is a means for attaching the inverter 12 directly to the speed reduction mechanism casing 15 in close contact therewith through surface contact at least a part of the inverter 12.

Abstract: A rachet strap tightener and a power driven rotary tool are arranged to be operated together for tightening a strap. The body of the power driven rotary tool is arranged to be anchored in mating engagement relative to the body of the rachet strap tightener, in addition to coupling the rotating mating parts of the tool and the strap tightener, such that the torque applied when winding the spindle of the tightener no longer acts to twist the tightener body from the user's hands but rather the torque is anchored directly through the bodies so that winding of the spindle with the power driven tool can be accomplished quickly, efficiently and in a safe manner.

Abstract: The invention relates to a suspended control device (20) which is suspended by means of a control line (1, 24) connected to a unit to be controlled (21). Said suspended control device is especially a control switch or a suspended push-button switch for controlling hoisting equipment, the control line (1, 24) comprising electrical lines (2) for transmitting control signals, and a traction relief element (22) which is supported at the top, on the unit (21), and used to absorb weight and tractive forces. The aim of the invention is to provide a suspended control device (20) whereby the length of the control line (1, 24) can be easily changed. To this end, a storage element for receiving and releasing a defined length of the electrical lines (2) is provided behind the region wherein the traction relief element (22) is supported, seen in the direction of the unit (21) from the suspended control device (20).

Abstract: A winch system, typically used in a roller coaster system, includes a hydraulic pump, a variable speed motor connected to the hydraulic pump, a first pipe connected to the hydraulic pump; a second pipe connected to the hydraulic pump comprising a second pressurized fluid; an accumulator system connected the pipes; a motor connected to the accumulator system; and a winch drum connected to the motor.

Abstract: The invention involves a hand held, power-assisted cable-pulling apparatus. The hand held, power-assisted cable-pulling apparatus has a housing, a take-up wheel, a drive transfer coupling, at least one dog pawl, a line, and a ground fixation mechanism. The housing has a hollow handle body within which is a fluid-powered actuator, a fluid control valve, for controlling fluid pressure supply to the actuator, and an operating trigger for the control valve. The wheel has a circumferential line-engaging portion and a concentric ratchet portion. The take-up wheel rotates about a take-up wheel shaft, which extends through the center of the take-up wheel. The take-up wheel shaft is attached with respect to the housing. Further, there is at least one dog pawl pivotally attached with respect to the housing. There is also a line having a cable attachment mechanism. The take-up wheel may be selectively rotated in a clockwise take-up direction.

Abstract: The invention relates to a cable winch arrangement with a cable winch, a winch drive and a control device, as well as to a method for the operation thereof. The control device makes it possible to connect in a first operating mode for raising and lowering and a second operating mode in which it is possible to set a superimposed load on a cable of the winch.

Abstract: A human power amplifier includes an end-effector that is grasped by a human operator and applied to a load. The end-effector is suspended, via a line, from a take-up pulley, winch, or drum that is driven by an actuator to lift or lower the load. The end-effector includes a force sensor that measures the vertical force imposed on the end-effector by the operator and delivers a signal to a controller. The controller and actuator are structured in such a way that a predetermined percentage of the force necessary to lift or lower the load is applied by the actuator, with the remaining force being supplied by the operator. The load thus feels lighter to the operator, but the operator does not lose the sense of lifting against both the gravitation and inertial forces originating in the load.

Abstract: The invention relates to a cable winch arrangement with a cable winch, a winch drive and a control device, as well as to a method for the operation thereof. The control device makes it possible to connect in a first operating mode for raising and lowering and a second operating mode in which it is possible to set a superimposed load on a cable of the winch.

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: The invention relates to a lifting device comprising a rope, wire, or the like, which at one end is provided with a gripping device (8) for the object to be lifted. The rope, wire, or the like (7) is at the other end connected to a pulling device. The invention is characterized in that the pulling device is so designed that the rope, when it is pulled up, occupies a considerably shorter length than the distance which the gripping device (8) has been lifted.

Abstract: A mobile service rig for wells includes a hoist powered by an internal combustion engine. In response to the hoist exerting a predetermined lifting force, the lifting force is limited by automatically limiting or reducing the speed of the engine.

Abstract: The present invention relates to a safety device for an air balancing hoist for braking and finally stopping a reel drum in such a manner that upon fast rotation of the reel drum during a lifting-up operation, a braking pawl attached to the reel drum is locked into a ratchet wheel secured on an end cap due to centrifugal force. The air balancing hoist includes a housing 102 with a chamber 101, which compressed air is introduced into and discharged from, formed therein and with end caps 104, 111 mounted on both ends of the housing, a piston 105 reciprocating along an inner periphery of the housing 102, a ball screw 106 installed in the housing 102 so that it penetrates the piston 105 and is secured to the end caps 104, 111 so as not to rotate, and a reel drum 110 with one end thereof rotatably supported by the piston 105 through a bearing 107 and with the other end thereof secured on a ball nut 108 rotatably engaged with the ball screw 106 so that the reel drum is rotated when moving along the ball screw 106.

Abstract: A balancing hoist, includes a housing having a chamber accessible from outside. Received in the housing is a piston which is movable by gas pressure in a longitudinal direction and rotates a threaded spindle which projects into the chamber of the housing and carries a nut that securely fixed to the housing. Mounted in fixed rotative engagement to the spindle and movable longitudinally along the spindle is a cable drum on which a load-carrying cable is wound. At least one pawl is provided and configured for rotation in opposition to an elastic restraining force from a radially inward idle position to a radially outward brake position as a result of centrifugal forces, when a rotation speed of the cable drum exceeds a predetermined level, thereby impacting upon a fixed stopper which projects radially inwardly from the housing and slowing down the rotation of the cable drum until it is at rest.

Abstract: A pneumatic motor is provided with twin cylinders each with a piston installed therein slidably, disposed horizontally adjacent in a direction parallel to axis of a motor shaft interposed between the twin cylinders and arranged in a direction intersecting with the twin cylinders at a right angle. An association system couples the motor shaft to each piston and is arranged so as to convert a linear movement of each piston into a rotational movement and transmit the rotational movement to the motor shaft. The twin cylinders, the motor shaft and the association system are disposed integrally in a casing. The association system has each of a first eccentric shaft and a second eccentric shaft, which in turn are disposed projecting from the motor shaft in opposite directions at a phase angle of 90 and coupled with a first eccentric pin and a second eccentric pin in an eccentric state, which in turn are coupled in association with the respective pistons.

Abstract: A control system for a pneumatic hoist limits the velocity or acceleration of a load attached to the hoist. The control system includes a controller and a valve. The controller provides a variable gain between an actuator, which controls the speed of the hoist, and the valve, which controls fluid flow into the hoist, thereby controlling the velocity or acceleration of the load. As the velocity or the acceleration of the load reaches a predetermined maximum value, the control system proportionally reduces the gain between the actuator and the valve, thereby closing the valve and reducing the velocity or acceleration of the hoist.

Abstract: A wireless lifting assist device includes a pulley driven by an actuator which is attached to a ceiling. An end-effector is suspended, via a line, from the pulley and interfaces the object to be maneuvered. The wireless lifting assist device further provides an instrumented glove worn by an operator. The glove measures the contact force the operator is exerting on either the object to be moved or the lifting assist device and generates a set of contact signals representing the contact force. The contact signals are transmitted to a controller. The controller generates a set of command signals to control the actuator as a function of the operator contact force such that a predetermined percentage of the force necessary to lift or lower the load is applied by the actuator, with the remaining force being supplied by the operator. The object thus feels lighter to the operator.

Abstract: The present invention relates to a safety device for an air balancing hoist for braking and finally stopping a reel drum in such a manner that upon fast rotation of the reel drum during a lifting-up operation, a braking pawl attached to the reel drum is locked into a ratchet wheel secured on an end cap due to centrifugal force. The air balancing hoist includes a housing 102 with a chamber 101, which compressed air is introduced into and discharged from, formed therein and with end caps 104, 111 mounted on both ends of the housing, a piston 105 reciprocating along an inner periphery of the housing 102, a ball screw 106 installed in the housing 102 so that it penetrates the piston 105 and is secured to the end caps 104, 111 so as not to rotate, and a reel drum 110 with one end thereof rotatably supported by the piston 105 through a bearing 107 and with the other end thereof secured on a ball nut 108 rotatably engaged with the ball screw 106 so that the reel drum is rotated when moving along the ball screw 106.

Abstract: The hoist apparatus includes a chain for raising or lowering an object; an upper hook member; a hoist body member suspended by the upper hook member; a lower hook member for hoisting the object mounted to the hoist body member at a bottom end thereof for hoisting the object; a pneumatic motor disposed in the hoist body member for winding the chain up or down; and a control unit for driving or suspending the hoist body member; wherein a distance of the chain between the control unit and the lower hook member is set to be variable.

Abstract: A human power amplifier includes an end-effector that is grasped by a human operator and applied to a load. The end-effector is suspended, via a line, from a take-up pulley, winch, or drum that is driven by an actuator to lift or lower the load. The end-effector includes a force sensor that measures the vertical force imposed on the end-effector by the operator and delivers a signal to a controller. The controller and actuator are structured in such a way that a predetermined percentage of the force necessary to lift or lower the load is applied by the actuator, with the remaining force being supplied by the operator. The load thus feels lighter to the operator, but the operator does not lose the sense of lifting against both the gravitation and inertial forces originating in the load.

Abstract: The pneumatic motor is provided with twin cylinders each with a piston installed therein slidably, disposed horizontally parallel to the axis thereof; a motor shaft interposed between the twin cylinders and arranged in a direction intersecting with the twin cylinders at a right angle; and the association system coupling a motor shaft to each piston and arranged so as to convert a linear movement of each piston into a rotational movement and transmit the rotational movement to the motor shaft; wherein the twin cylinders, the motor shaft and the association system are disposed integrally in a casing; the association system is coupled with the end portion of each of a first eccentric shaft and a second eccentric shaft, which in turn are disposed projecting from the motor shaft in opposite directions at a phase angle of 90° and coupled with a first eccentric pin and a second eccentric pin in an eccentric state, which in turn are coupled in association with the respective pistons; and a pinion gear is disposed

Abstract: A manually controlled lifting device is provided including a pneumatic lifting drive, a lifting member, a load carrying means, a pressure source, a pressure line, a flow control device, a pneumatic pressure switch and a vent drive. The lifting member is arranged on the pneumatic lifting drive and is a load transmitting component of at least two parts. The load carrying means is attached to the lifting member for carrying a load. The pressure line has a first end and a second end where the first end is in communication with the pressure source and the second end is in communication with the pneumatic lifting drive. The flow control device is in communication with the pressure line and integrated between the two parts of the load transfer component and the pressure source. The flow control device automatically varies a cross section of flow in the pressure line in relation to a load acting on the load carrying means.

Abstract: A force multiplying device is provided for use in conjunction with a balancing system for moving a load from an elevated position and to a predetermined lower position. The balancing system includes an extendable cable with a free end adapted to be secured to and exert an upward force on the load. The device includes a base which is secured to the load and a first lever pivotally secured at an intermediate point to the base about a generally horizontal axis. A fixed length flexible member has one end secured to a first end of the lever and a second end fixedly secured to a support position above the load. The length of the flexible member is such that the flexible member is in a fully extended position when the load is in the predetermined lower position. An elongated rocker arm has a first end in abutment with the base while the cable from the balancing system is secured to a second end of the rocker arm.

Abstract: A balancing hoist, includes a housing having a chamber accessible from outside. Received in the housing is a piston which is movable by gas pressure in a longitudinal direction and rotates a threaded spindle which projects into the chamber of the housing and carries a nut that securely fixed to the housing. Mounted in fixed rotative engagement to the spindle and movable longitudinally along the spindle is a cable drum on which a load-carrying cable is wound. At least one pawl is provided and configured for rotation in opposition to an elastic restraining force from a radially inward idle position to a radially outward brake position as a result of centrifugal forces, when a rotation speed of the cable drum exceeds a predetermined level, thereby impacting upon a fixed stopper which projects radially inwardly from the housing and slowing down the rotation of the cable drum until it is at rest.

Abstract: A winch, includes a housing which receives therein a rotatable rope drum moveable in a longitudinal direction between two end positions through operation of a gas-actuated piston. A spindle, mounted in fixed rotative engagement to the rope drum and extending in coaxial relationship thereto, carries a nut which is securely fixed to the housing for guiding the spindle in the longitudinal direction. Arranged coaxially between the piston and the rope drum is a pivot bearing which includes two bearing rings arranged side-by-side in a direction of a rotation axis of the pivot bearing, whereby, during operation, an end face of the rope drum rests upon one of the bearing rings, and the piston rests on the other one of the bearing rings.

Abstract: A cable retraction speed limiter has a body which is designed to be mounted on the housing of a hoist and a spool which is rotatably supported by the body. A flexible extension member is disposed about the spool so that it can be extended from and retracted onto the spool by rotation of the spool. The end of the flexible extension member is designed to be attached to an air pressure responsive member inside of the air balancing hoist. The cable retraction speed limiter also includes a spool lock that stops rotation of the spool when the rotational speed of the spool exceeds the rotational speed limit, thereby limiting the hoist cable retraction speed.

Abstract: A pneumatic human power amplifier module is usable in conjunction with a wide variety of pneumatic actuators and lifting devices to provide a human power amplifier for lifting a load. The module includes an end-effector, an electronic controller and a pneumatic circuit. The end-effector contains a human interface subsection which is grasped by a human operator and a load interface subsection which engages the load to be lifted. A force sensor in the end-effector detects the force imposed by the operator on the end-effector and transmits a signal representing the magnitude of the force to the controller. The controller in turn sends a command to the pneumatic circuit, which controls the flow of air into the associated pneumatic actuator. The actuator drives the lifting device.

Abstract: A pneumatically operated balancing hoist includes a housing forming a gas chamber, an inlet for communicating with the gas chamber, a sliding piston, and a rotatable longitudinally movable cable drum. The rotatable longitudinally movable cable drum contains one or more longitudinal openings which slidably accommodate drive rods. The drive rods impart the rotation of the cable drum to a flywheel. Exterior to the flywheel are rotating brake shoes which contact a stationary braking surface when the rotation of the longitudinally movable cable drum exceeds a predetermined angular acceleration. A conically shaped brake system attached to the flywheel is mechanically engaged to prevent rotation of the cable drum until pressurized gas is supplied to the chamber.

Abstract: A winding machine, useful as an air hoist, includes a winding portion about which a chain is wound, and from which articles are hung for loading and/or unloading thereof. The winding machine is rotationally powered by an air driven motor controlled by an air supply valve which regulates the supply of air to the motor by virtue of a built-in variable shuttle valve. An operation unit pneumatically biases a main spool in the shuttle valve in a desired direction and to a selected extent to provide, respectively, rotation in normal and reverse directions, by permitting adjustable flow-through of air from a supply line. A rotation suspending mechanism includes an air activated braking mechanism, normally biased to provide braking of the motor when not actively being rotationally operated. The braking mechanism is connected through a variable aperture to the air supply, such that sufficient air pressure provided thereto overcomes the biasing thereof.

Abstract: A combination of air balancing hoists is described in which two or more hoists are connected end to end each with a load cable connected at spaced locations on the load item to enable raising a bulky load item. Force transmission rods axially interengage axially moving components of the connected hoists to insure that the cables are raised and lowered together to maintain the attitude of the load item as it is raised or lowered.

Abstract: An air lifting and balancing unit including a cylinder, a piston in the cylinder, a ball screw affixed to the piston, a ball nut mounted for rotation on the ball screw, a drum mounted on the ball nut, a chain driven by the drum, and centrifugally actuated brakes mounted on the drum for stopping rotation of the drum when the drum exceeds a predetermined acceleration either due to a loss of load or to a loss of air pressure applied to the piston, and a pneumatic circuit in communication with the cylinder for providing air pressure thereto which applies a force on the piston which is at a substantially constant incremental value in opposition to the force exerted by the load applied to the piston through the chain and the drum and the ball screw regardless of variations in said air pressure to thereby cause the speed of the chain to remain substantially constant.

Abstract: An air balancing hoist is described having an axially movable drum reel supported on a ball nut and screw with a piston defining a pressure chamber containing regulated air pressure acting on one end of the drum reel to counter the unwinding force of a load supported on a cable wound on the drum reel. A centrifugal brake retards drum rotation when there is a sudden release of the load tending to cause too rapid wind up of the cable by the regulated air pressure applied on the piston.

Abstract: A pneumatically operated balancing hoist includes a housing forming a chamber therein and an inlet for communicating with the chamber. Slidably positioned in the housing is a piston. A rotating cable drum moves longitudinally within the housing with the piston. The rotating cable drum contains one or more longitudinal openings. When the rotating cable drum is moved longitudinally, rod mechanisms slidably and longitudinally engage the cable drum through one or more longitudinal openings, causing a flywheel located at one end of the housing to rotate. When the rotation of the cable drum exceeds a predetermined speed, one or more brake shoes pivotably mounted to the flywheel will move outwardly to contact a braking surface located on the interior of the housing to stop the rotation of the cable drum.

Abstract: An air lifting and balancing unit including a cylinder, a piston in the cylinder, a ball screw affixed to the piston, a ball nut mounted for rotation on the ball screw, a drum mounted on the ball nut, a chain driven by the drum, and centrifugally actuated brakes mounted on the drum for stopping rotation of the drum when the drum exceeds a predetermined acceleration either due to a loss of load or to a loss of air pressure applied to the piston, and a pneumatic circuit in communication with the cylinder for providing air pressure thereto which applies a force on the piston which is at a substantially constant incremental value in opposition to the force exerted by the load applied to the piston through the chain and the drum and the ball screw regardless of variations in said air pressure to thereby cause the speed of the chain to remain substantially constant.

Abstract: An air balancing hoist having one or more activators providing a signal when a load reaches one or more predetermined heights. The activators each comprise spring loaded plungers mounted to be shifted from an axial location by movement of the drum spool to a predetermined axial location.

Abstract: A mechanical limit control device for adjustably halting the operation of a winch at preset points including a proportionally driven flexible cog belt providing a compact conformable configuration having projections which operate a snap action air valve to limit the deployment extent of a pneumatically operated winch.

Abstract: A buoyant crane is disclosed which moves loads that are entirely out of a liquid body such as water, in response to buoyant forces acting on an expandable and contractible chamber located in the liquid body. Buoyant forces acting on the chamber are produced in relation to the volume of the chamber. The chamber is movably supported in the liquid body so that it may rise and sink in accordance with buoyant forces acting on the chamber responsive to changes in the volume of the chamber. A compressed gas source supplies compressed gas (e.g., air) to the chamber to selectively change its volume. A rope and pulley system couples the chamber to a load for moving the load, which is entirely out of the liquid body, in response to movement of the chamber within the liquid body in turn responsive to the buoyant forces acting on the chamber.

Abstract: An air lifting and balancing unit including a cylinder, a piston in the cylinder, a ball screw affixed to the piston, a ball nut mounted for rotation on the ball screw, a drum mounted on the ball nut, a chain driven by the drum, and centrifugally actuated brakes mounted on the drum for stopping rotation of the drum when the drum exceeds a predetermined acceleration either due to a loss of load or to a loss of air pressure applied to the piston, and a pneumatic circuit in communication with the cylinder for providing air pressure thereto which applies a force on the piston which is at a substantially constant incremental value in opposition to the force exerted by the load applied to the piston through the chain and the drum and the ball screw regardless of variations in said air pressure to thereby cause the speed of the chain to remain substantially constant.

Abstract: A safety device for an air balancing hoist includes one or more piston and cylinder shock absorbers engaged by one end of the drum ball nut, which creates a substantial retarding force at high speed but does not generate significant impeding forces at low speeds.

Abstract: An electrically powered oil well pipe extractor includes a standard well servicing rig having a winch driven by a combustion engine. An auxiliary vehicle has an electric motor connected through a transmission or torque convertor, through a drive shaft, to the winch on the well servicing rig. The combustion engine is disengaged from the winch and the winch is driven by the electric motor on the auxiliary vehicle during pipe extraction operations at a well site having electric power available. Exhaust emissions and noise are significantly reduced.

Abstract: A reeling control system and an air driven tow reel machine incorporating such a control system are disclosed. In the disclosed control system and reeling machine of the present invention, towline velocity is monitored and reel-in and reel-out operations are regulated according to a programmed towline velocity profile. A position sensor senses the position of the turbine vent doors and a velocity sensor device provides the instantaneous towline velocity. A velocity comparator compares the instantaneous towline velocity with a desired velocity value from a desired velocity profile. Based upon the difference between actual and desired towline velocities, a door control device generates a driving signal for controlling the vent door position accordingly.

Abstract: A turbine/air vent reeling machine for use in aerial towed target applications and the like disclosed characterized by use of a novel turbine head/air vent design which extracts ram air energy from the wind stream impinging upon a moving aircraft for the purpose of driving and braking the reeling machine for pay-in and pay-out of a towed target. Control of the turbine rotational speed is achieved through plural variable opening vents located aft of the turbine head which are driven through an open and closed orientation by a servo-motor to throttle the air mass flow through the turbine head. Turbine speed is sensed by a tachometer which is coupled to a shaft driven by the turbine. The tachometer output voltage is introduced into a closed loop control circuit including processing electronics which compares the tachometer voltage to a pre-selected set point voltage corresponding to the desired rotational speed of the turbine.

Abstract: The present invention provides a slide cylinder device having a frame with enhanced torsional rigidity and which can have an additional member interposed between the cylinder and the moving board without interfering with the moving board operation. The slide cylinder includes fixed pulleys, whose peripheries are partially exposed from an upper wall of the frame and movable pulleys. A flexible member is connected between the moving board, one of the movable pulleys, one of the fixed pulleys and a wall of the frame.

Abstract: An electric power cable reeling apparatus that can be detachably attached to a rubber tired dozer. The reeling apparatus comprises a frame that is provided with a hydraulic motor and clutch assembly for rotating the cable reel shaft for reeling in the cable. The frame is also provided with jacks that are used to maintain the frame at a selected vertical position. A split bearing assembly is used to hold the cable reel shaft onto the frame. By adjusting the vertical position of the frame the cable reel can be easily mounted or dismounted by rolling the cable reel on or off.

Abstract: A control device for an air hoist drives an air motor rotated by an air supply. The air hoist lifts or lowers a load by rotating a chain wheel. When the chain wheel rotates to lower the load, a small amount of air is supplied to the air motor in order to drive it in the normal lifting direction so that the braking force generated by the motor may reduce the load lowering speed and may gradually lower the load utilizing its own weight. Also, a mechanism for restraining the rotation in the normal lifting direction, when the chain wheel is under slow speed control, is actuated to restrain the rotation of the air motor, thereby stopping the chain wheel in a safe and sure manner without using a mechanical brake.

Abstract: Fluid-operated apparatus is provided for handling and lifting loads of various weights. The apparatus includes a fluid-operated hoist with an elongate member extending therefrom to a load-carrying unit. A pilot fluid-controlled regulator supplies fluid to the hoist and a load-responsive, pilot fluid regulator is carried by the load-carrying unit and supplies pilot fluid to the pilot fluid-controlled regulator. The pilot fluid is varied according to the weight of a load so that the pressure of the fluid supplied to the hoist is accordingly varied by the pilot fluid-controlled regulator to automatically balance the load carried by the load-carrying unit. The load can also be lifted by bypassing the pilot fluid-controlled regulator and controlling flow of fluid to the hoist by a manually-adjustable flow control valve. The apparatus also can include a brake for preventing the elongate member from moving up or down while loads are being changed or are at rest.

Abstract: Fluid-operated apparatus is provided for handling and lifting loads of various weights. The apparatus includes a fluid-operated hoist with an elongate member extending therefrom to a load-carrying unit. A pilot fluid-controlled regulator supplies fluid to the hoist and a load-responsive, pilot fluid regulator is carried by the load-carrying unit and supplies pilot fluid to the pilot fluid-controlled regulator. The pilot fluid is varied according to the weight of a load so that the pressure of the fluid supplied to the hoist is accordingly varied by the pilot fluid-controlled regulator to automatically balance the load carried by the load-carrying unit. The load can also be lifted by bypassing the pilot fluid-controlled regulator and controlling flow of fluid to the hoist by a manually-adjustable flow control valve. The apparatus also can include a brake for preventing the elongate member from moving up or down while loads are being changed or are at rest.