Abstract: A water well recharge throttle valve is configured as a hydraulically actuated flow control device that permits calibrated throttling of water used in Artificial Storage and Recovery (ASR), Salt Water Barrier, Dedicated Recharge and Injection Wells to prevent the free cascading of water and thereby eliminate the entrainment of air which may cause air fouling, bio-fouling, and calcite formation with a resultant reduction in permeability of the aquifer. The valve includes a fixed tubular member which is selectively mounted in one of three ways: (1) to the lower end of the pump column, below the pump with a check valve/strainer mounted below the unit and including a co-generation/recharge feature; (2) to the lower end of the pump column, and above the check valve and submersible pump; and (3) to the lower end of a drop pipe, with a blind flange connected to the bottom end of the valve, a dedicated recharge well application.

Abstract: A cylinder device includes a casing with a pair of fluid inlet/outlet ports defined therein, a base plate, a piston fixed to the base plate, a cylinder, and a top plate. The cylinder device also has first, second, and third cylinder chambers defined in the cylinder between the base plate, the piston, and the top plate, a first fluid passage and a second fluid passage through which one of the fluid inlet/outlet ports communicates with the first and third cylinder chambers, and a third fluid passage and a fourth fluid passage through which the other fluid inlet/outlet port communicates with the second cylinder chamber.

Abstract: A linear thruster is disclosed in which a load beam is linearly moved by fluid power relative to a guide beam and a piston. The beams are multisided in cross-section to substantially increase the linear bearing area between the bodies and, thereby, substantially increase the strength of the linear thruster against side forces as well as moments to which the linear thruster might subjected. Internal positioning of the components and energy transmission are maximized and the stroke may be variably adjusted.

Abstract: A cylinder apparatus includes a base plate, a piston fixed to the base plate and having a piston head and a piston rod connected thereto, a cylinder body having a cylinder chamber defined on one side of the piston head and a cylinder chamber defined on another side of the piston head around the piston rod, the cylinder body being supported for reciprocating movement with respect to the base plate in axial directions of the piston, an upper plate fixed to the cylinder body, and a bushing held in slidable contact with an outer circumferential wall surface of the cylinder body for guiding the reciprocating movement of the cylinder body.

Abstract: A hydraulically actuated locking element with two locking bolts axially displaceable on an axis. A carrying structure is provided with two, slidingly guided hydraulic cylinders, two cylinder bottoms, which act as locking bolts and are designed as force-transmitting cylinder bottom. A centrally fastened, common piston rod of the hydraulic cylinders is provided with a stationary piston at each piston rod end. A centrally rigidly connected piston rod fastening is arranged in the carrying structure and between the two, sliding hydraulic cylinders. The piston rod fastening and the piston rod are provided with holes for guiding hydraulic oil.

Abstract: An actuator for fluid control valves with a reversible power module having a stationary inner member and a coaxially aligned movable outer member coupled to the valve flow control element and slidably movable on the inner member. A chamber formed between respective ends of the members includes a preformed bladder. Pneumatic pressure applied to the bladder drives the movable member to actuate the valve in a first direction. A spring returns the movable member in the second direction. The preformed bladder is formed with two pieces including an interconnecting perimeter portion. During bladder actuation the bladder perimeter portion is displaced from the bladder inner diameter to the bladder outer diameter with the bladder material in tension to thereby prolong bladder life.

Abstract: A positioning device having a high rigidity and smooth positioning characteristics. The positioning device holds a piston formed integrally with a table within a cylinder and has pressure-adjusting elements in two pressurizing chambers in the cylinder partitioned with the piston. A gas is ejected into a clearance between the piston and the cylinder to hydrostatically support the piston. The emitted gas is introduced into the two pressurizing chambers to drive the piston and the table by the pressure difference between the pressurizing chambers. The pressure-adjusting elements include nozzles for emitting the gas in the pressurizing chambers and pressure-adjusting bodies for changing the opening degree of the ejecting port of the nozzles.

Abstract: A cylinder apparatus includes a base plate, a piston fixed to the base plate and having a piston head and a piston rod connected thereto, a cylinder body having a cylinder chamber defined on one side of the piston head and a cylinder chamber defined on another side of the piston head around the piston rod, the cylinder body being supported for reciprocating movement with respect to the base plate in axial directions of the piston, an upper plate fixed to the cylinder body, and a bushing held in slidable contact with an outer circumferential wall surface of the cylinder body for guiding the reciprocating movement of the cylinder body.

Abstract: A forward-moving inching unit and a backward-moving inching unit are built in a casing (1) which is slidable relative to a guide member (b).

Abstract: An actuator pump has one or more colinear piston cylinders (2, 3, 25) in a cylinder housing (1) in which change of volume is provided by reciprocative relationship of colinear pistons (4, 5, 23, 24,) in the colinear piston cylinders. One or more travel guides (6, 8) in sliding contact with guide cylinders (7, 9) in the cylinder housing are parallel to the travel guides. The colinear pistons and travel guides are attached to pump bases (10, 11) at opposite ends of the travel guides. Inward-pressured rings (14, 26), outward-pressured rings (29), fluid conveyances (16, 19, 30, 31), valves (36) and attachment components (21) for reciprocative actuation are provided selectively for particular design requirements.

Abstract: A linear actuator has an actuator body having a through hole defined axially therein and an opening defined in an upper surface thereof, a pair of end blocks, a slide table reciprocally movable in the directions indicated by the arrows X, Y, a pair of cylindrical members coupled to the end blocks, respectively, and having respective passages communicating with fluid outlet/inlet ports, respectively, defined in the actuator body, a joint member movable in unison with the slide table, a pair of cover members held in surface-to-surface contact with the joint member in confronting relation to each other and hermetically surrounding outer circumferential surfaces of the cylindrical members, for sliding displacement in unison with the slide table, and a pair of pressure chambers defined by the cylindrical members and the cover members and closed by the cover members, the pressure chambers communicating with passages in the cylindrical members.

Abstract: A jack consists of a body of the jack (2) sliding on a fixed piston (9) mounted on a support (6) by means of a piston rod (4), and at least one element for guiding the body on the support. The body of the jack is an extruded section (2) containing at least one longitudinal bore (3) used as the piston chamber for the jack, and equipped with at least two guide rods (5) mounted on the section (2) in the longitudinal direction. Bearings (15) adapted to the shape of the guide rods (5) are mourned on the fixed support (6). At least one of the bearings is adjustable. Advantageously, the extruded section (2) is equipped with two hydraulic shock absorbers intended to contact limit stops (21). Limit stops (21) have adjustable positions, and can be retracted and fixed on an L-shaped groove (20) of the fixed support (6).

Abstract: A rotary actuator and a linear actuator are combined to provide an output shaft with independent linear and rotary motion. The linear actuator causes the rotary actuator to move linearly, and there is a guide which restricts the movement of the rotary actuator to linear motion and a bearing which receives the output shaft of the rotary actuator to prevent orbiting and deflection of the rotary output shaft.

Abstract: A vacuum pump for removing air from containers includes a pump housing in the form of a conduit with an open end and a closed end. A piston in the form of a conduit, open at each end, is slidably mounted within the housing, and has an inside end within the housing and an outside end protruding from the housing. The outside end of the piston is adapted to fit over a valve secured to the container. A piston ring is provided substantially at the inside end of the piston. The piston ring is adapted to mate tightly with an interior surface of the housing, such that movement of the housing away from the outside end of the piston will draw a vacuum through the valve to remove air from the container through the valve. A system and method for removing air from containers is also disclosed.

Abstract: An actuator for fluid control valves with a reversible power module having a stationary inner member and a coaxially aligned movable outer member coupled to the valve flow control element and slidably movable on the inner member. A chamber is formed between respective ends of the members. Pneumatic pressure applied to the chamber drives the movable member to actuate the valve in a first direction. A spring returns the movable member in the second direction. A second chamber is defined within the inner member and pneumatic pressure applied to the second chamber drives the movable member with or without the spring.

Abstract: A latch pin actuator (34) for use in connection with an aircraft (10) having folding wings or wing tips (12). The actuator (34) includes housing (38) mountable to a wing portion (12, 16). A latch pin (21) in the form of a hydraulic cylinder is slidably mounted within the housing (38) and on a piston (44) which is fixed to the housing (38). Variable volume fluid chambers (46, 48) are defined in the cylinder body of the latch pin (21). A primary lock member (58) is movable between locked and unlocked positions such that retraction of the latch pin (21) is prevented when the primary lock (58) is in a locked position. In preferred form, a hydraulic actuator (78) is used to move the primary lock member (58) between locked and unlocked positions and to operate a sequencing valve which delivers hydraulic pressure to a chamber (48) of the latch pin (21) after actuation of the primary lock (58).

Abstract: A linear hydraulic motor including a first piston rod (12) and piston head (16), a second piston rod (18) and piston head (26), and a cylinder housing (30), having a divider wall (46), adapted to reciprocate longitudinally on the piston heads (16, 26). The cylinder housing (30) has end members (34, 36) through which piston rods (12, 18) extend. Four fluid chambers (52, 54, 56, 58) are formed within the linear hydraulic motor. Fluid chambers (52, 56) communicate with each other through conduits (62), and fluid chambers (54, 58) communicate with each other through conduit (64). Piston rods (12, 18) include conduits (68, 70) for fluid communication with chambers (54, 56). A snubber (74) is provided in the divider wall (46) of the cylinder housing (30). The snubber (74) reciprocates within the divider wall (46) and is adapted to abut the inner ends of the piston rods (12, 18) as the divider wall (46) approaches piston heads (16, 26) during the reciprocating process.

Abstract: A pressure cylinder in which the piston is hollow and the pressurized fluid is introduced into the hollow of the piston. The cylinder housing includes a core member with supply and exhaust ports. An area between the rear wall of the housing and a rear wall of the piston is exposed to atmospheric pressure at all times, elliminating a need for seals on the outside surface of the piston, and allowing for the piston to be exposed to large transverse forces. Proximity switches are provided in a slot in the upper wall of the cylinder housing to detect the arrival of the piston at its limit positions and a pin secured to the cylinder housing engages a slot in the outer periphery of the piston to guide the forward and rearward movement of the piston within the cylinder. A slot may be provided in the upper wall of the cylinder housing for receipt of a work positioning member secured to the outer periphery of the piston.

Abstract: An object of the present invention is to provide a two dimensional drive system driven by fluid pressure. The drive system of the present invention comprises: a pair of X-guides; a pair of Y-guides; an X-rod whose each end is slidably attached to each Y-guide; a Y-rod whose each end is slidably attached to each X-guide; an X-piston section being provided at the midway of the X-rod; a Y-piston section being provided at the midway of the Y-rod; and a moving body having an X-chamber through which the X-rod is pierced and a Y-chamber through which the Y-rod is pierced, the X-chamber being divided into two subchambers by the X-piston section, the Y-chamber being divided into two subchambers by the Y-piston section. With this structure, the moving body is capable of moving in a plane by selectively supplying fluid to each subchamber.

Abstract: A high speed pneumatic press is provided with an arrangement which reduces moving mass thereby reducing the tendency of the press to vibrate and "walk" during operation and also minimizing wear on the press. The press includes a fluid actuated ram having a ram cylinder and ram piston, the ram cylinder being lower in mass than the ram piston and connected to a reciprocating platen thereby reducing the moving mass associated with the reciprocating platen.

Abstract: A method and apparatus for simultaneously cooling and scanning an infrared detector assembly, by mounting the infrared detector assembly on the cold surface of a cylinder-piston type cooling device in the image plane of an optical assembly, and driving the cylinder through reciprocations with respect to the piston to also reciprocate the infrared detector assembly perpendicular to the optical axis of the optical assembly. The disclosed cooling device is a Stirling cooler having a compressor section and an expander section, and the cold surface, which is reciprocated and on which the infrared detector assembly is mounted, is the cold tip on the outer face of the cylinder in the expander section.

Abstract: The press has a pneumatically operated piston and cylinder mounted beneath a work plate, and linked to an upper press plate by rods extending through the work plate to provide compression in a die-set area defined between the upper press plate and the work plate. The pneumatically operated piston and cylinder are encased within an enclosed base which is insulated. The movable cylinder acts against springs also mounted within the base which cause the press plate to rebound after a pneumatically operated downstroke.

Abstract: Described herein is an internal mixer of the type including a mixing chamber rotatably accommodating mixing rotors therein, a hopper frame erected on the mixing chamber, a charge hopper provided on one lateral side of the hopper frame for charging a mixing material therethrough, and a floating weight provided in the hopper frame for upward and downward movements therein, the floating weight being held in an upper lifted position when charging a mixing material into the mixing chamber and then lowered into a pressing position in a mixing stage to apply pressure on the charged material in the mixing chamber, wherein the floating weight is dimensioned to have an axial length sufficient for closing an inlet opening formed in the side wall of the hopper frame in communication with the charge hopper, when in the lower pressing position, and lift means for lifting the floating weight up and down in the hopper frame is provided separately from a pressing means with a function of pressing the floating weight resilient

Abstract: A three-position hydraulic actuator comprising an outer body defining a cylindrical inner cavity; a dual-rod piston sliding inside the cavity; a pair of stop rings mounted in respective central annular seats in the lateral wall of the cavity and on the piston; and a pair of bushes sliding in sealed manner between the piston and the lateral wall of the cavity and located on axially opposite sides in relation to the stop rings.

Abstract: A long stroke deep well pumping unit which employs a fluid motor connected with a polish rod by using a plurality of belts, fixed at either end, to reciprocate the sucker rod through repeated long strokes with a minimum of stress and shock to the sucker rod during directional change.

Abstract: A hydraulic cylinder that is capable of being set in three positions utilizing a movable cylinder with a fixed main piston and auxiliary pistons slidably mounted within the cylinder. Right and left fluid chambers are defined, within the cylinder, by the main piston and right and left auxiliary pistons respectively.

Abstract: A speed control system for a working vehicle comprises a hydrostatic transmission for propelling the vehicle, a hydraulic cylinder and a control valve. The hydraulic cylinder includes a cylinder case operatively connected to a control shaft for varying a swash plate angle of the hydrostatic transmission, and a piston rod fixed to a case containing the hydrostatic transmission. The control valve is fixed to the cylinder case and includes a spool extending parallel to the hydraulic cylinder and operatively connected to a foot pedal for manually controlling the hydrostatic transmission. The cylinder case is shiftable following a shift of the valve spool.

Abstract: A concentric hydraulic actuator for use with a manual transmission motor vehicle of the type in which the actuator housing moves in response to depression of the clutch pedal and the associated piston remains axially affixed.

Abstract: The cylinder has a sealed back wall through which the rod passes. A piston assembly mounted on the rod between the back wall and a cylinder front end-piece contains a fluid-pressure-activated clamp. The front end-piece also has a clamp. By sequenced operation alternatively fixing the piston or the cylinder to the rod through the respective clamp, the relative travel of cylinder and rod can be extended to any desired length.

Abstract: Disclosed is a fluid powered linear slide employing either a rodless or rod-type cylinder. The slide includes a base which has a movable carriage mounted thereon which moves reciprocably in response to pressurized fluid being fed to the cylinder. In the embodiment employing a rod-type cylinder, a pair of tubular rods are mounted on the base in a fixed position and attached to a piston stationarily mounted inside the cylinder which is movably mounted and attached to the carriage. In the other embodiment, the carriage is mounted on a bracket which is attached to the rodless cylinder carried in the housing for the cylinder. The base has linear guideways therein, each guideway carrying one or more stop members which are manually adjustable and electrically or fluidly actuated.

Abstract: A full free lift mast assembly having a first pair of spaced apart uprights, a second pair of spaced apart uprights mounted on the first pair of uprights and elevationally movable therealong and a carriage mounted on the second pair of uprights is provided. A first mast lift jack is connected between the first and second pairs of spaced apart uprights, and first and second interconnected carriage lift jacks are pivotally connected to and between the second pair of spaced apart uprights and the carriage. A first connecting arrangement connects a cylinder of the first and second carriage lift jacks and maintains the first and second carriage lift jacks parallel, in a preselected overlapping relationship relative to each other. Therefore, bending of the carriage lift jacks, fluid leakage, missequencing and the like have been substantially reduced. The full free lift mast assembly is particularly suited for use on a material handling vehicle.

Abstract: This relates to a positioning device for positioning a member relative to a work piece. In the preferred use of the positioning device, a sealing head is carried by the positioning device with the sealing head having a first lowered position for picking up a lid for a container and a second lowered position for positioning the lid and thereafter bringing the lid into pressure engagement with an associated container and effect the heat sealing of the lid to the container. The positioning device includes an extensible fluid motor of the piston and cylinder type which is mounted within a guide sleeve for selective vertical positioning by way of a cam follower and cam track and which extensible fluid motor is further selectively extensible so as to further move an associated member carried thereby downwardly and into resilient clamping engagement with the work piece.

Abstract: The actuator of the present invention comprises a cylinder with a circular cylindrical cavity slidably engaged by a stationary piston secured to the frame of the actuator by at least one rod extending through one end wall of the circular cylindrical cavity in a leak-proof manner, wherein the stationary piston divides the circular cylindrical cavity into two compartments in a leak-proof manner. Pressurizing one and venting the other of the two compartments moves the cylinder relative to the stationary piston. The outer cylindrical surface of the cylinder includes fastening device for securing an object to be linearly actuated thereto or rack engaging a pinion gear that converts the linear motion of the cylinder to a linear motion of a sliding member with another rack or to a rotary motion of the pinion gear shaft.

Abstract: A pivotation device for a centrifugal chain assembly of a motor vehicle comprises a drive, a rack longitudinally displaceable by the drive, a gear wheel forming with the rack a gearing, an output drive shaft driven by the gear wheel and a pivotation arm, connected thereto by a coupling, for the centrifugal wheel of the assembly. A guide rod of round material extends parallel to the rack, which is guided in a flying manner on the guide rod. The teeth of the rack are located at the side facing away from the guide rod and the gear wheel supporting the rack against a lateral pivotation about the guide rod.

Abstract: A back pressure valve accumulates therein a predetermined amount of fluid having pressure higher than a predetermined level.The back pressure valve comprises a casing having a chamber formed therein, which chamber is communicating with an inlet port and an outlet port, a piston which is slidably installed in the casing, an elastic member which urges the piston toward the inlet port, and a relief valve which opens when pressure in the chamber exceeds a predetermined pressure level so as to permit flow of fluid from the inlet port to the outlet port.The back pressure valve further comprises a cylindrical piston which is slidably inserted between an outer periphery of the piston and an inner periphery of the casing, and an outer elastic member which urges the cylindrical piston toward the inlet port.The back pressure valve minimizes occurrence of trouble due to clogging of contaminations though it is simple in construction and inexpensive.

Abstract: A one moving part, bi-directional rotary displacement mechanism for conveying rotational movement about an axis to movable members in flight vehicles. In consists of an enclosure having bi-directional rotation capability, encapsulating a vane with bi-directional ducts venting from its load bearing surfaces. The vane is affixed to a bi-directionally ducted shaft, having bi-direcitonal rotation capability, extending through the center and outside of the enclosure. A conically shaped, sealed, positive stop, with load bearing surfaces, eminating from the inside radius of the housing, points toward the horizontal axis, supports the shaft and facilitates axial rotation. The vane has a radius concentric with the inside radius of the enclosure and allows sealed bi-directional rotary movement between the two surfaces. Two sealed cavities exist between the load bearing surfaces of the vane and the positive stop. Pressure to and from the cavities flows through the joined vane and shaft ducting.

Abstract: Disclosed is a fluid powered linear slide employing either a rodless or rod-type cylinder. The slide includes a base which has a movable carriage mounted thereon which moves reciprocably in response to pressurized fluid being fed to the cylinder. In the embodiment employing a rod-type cylinder, a pair of tubular rods are mounted on the base in a fixed position and attached to a piston stationarily mounted inside the cylinder which is movably mounted and attached to the carriage. In the other embodiment, the carriage is mounted on a bracket which is attached to the rodless cylinder carried in the housing for the cylinder. The base has linear guideways therein, each guideway carrying one or more stop membes which are manually adjustable and electrically actuated.

Abstract: This invention relates to a novel system for removing foreign particles from a machine part, and, more particularly, to a system for cleaning meat by-products from meat processing rollers or other equipment.

Abstract: Piston rods (60, 62) of three linear hydraulic motors (36, 38, 40) are connected at their outer ends (64, 68) to two spaced apart transverse frame members (10, 12). A cylinder housing (72) is driven back and forth along each pair of piston rods (60, 62). Three transverse drive beams (48, 50, 52) are provided. Each drive beam (48, 50, 52) is directly connected to an associated one of the cylinder housings (72). Three sets of floor slat members (1, 2, 3) are provided. Each set (1, 2, 3) is connected to an associated one of the transverse drive beams (48, 50, 52). The linear hydraulic motors (36, 38, 40) are operated for moving the floor slat members (1, 2, 3) in one direction, for advancing a load, and for retracting them in the opposite direction. Each cylinder housing (72) has four fluid chambers (82, 84, 86, 88). The first and third chambers (82, 86) are interconnected and the second and fourth chambers (84, 88) are interconnected.

Abstract: Piston rods (60, 62) of three linear hydraulic motors (36, 38, 40) are connected at their outer ends (64, 68) to two spaced apart transverse frame members (10, 12). A cylinder housing (72) is driven back and forth along each pair of piston rods (60, 62). Three transverse drive beams (48, 50, 52) are provided. Each drive beam (48, 50, 52) is directly connected to an associated one of the cylinder housings (72). Three sets of floor slat members (1, 2, 3) are provided. Each set (1, 2, 3) is connected to an associated one of the transverse drive beams (48, 50, 52). The linear hydraulic motors (36, 38, 40) are operated for moving the floor slat members (1, 2, 3) in one direction, for advancing a load, and for retracting them in the opposite direction. Each cylinder housing (72) has four fluid chambers (82, 84, 86, 88). The first and third chambers (82, 86) are interconnected and the second and fourth chambers (84, 88) are interconnected.

Abstract: A gate valve (10) having a valve operator (40) fully contained within a valve body with means for communicating fluid under pressure to the valve operator (40) to move a gate (32) to a valve open or a valve closed position. The valve operator (40) is located within the gate chamber (30) and the gate (32) itself contains and forms part of the valve operator (40) and, thus, considerable space is conserved. In one embodiment, the means for communicating pressure fluid to the valve operator includes a manifold (16) to allow the valve body (12) to rotate as part of a drilling assembly yet be remotely controllable. In another embodiment, the manifold may be eliminated for the use of the valve does not require rotation.This invention introduces gate valve technology into drilling operations to displace ball valves as kelly cock valves.

Abstract: Piston rods of three linear hydraulic motors are connected at their outer ends to two spaced apart transverse frame members. A cylinder housing is driven back and forth along each pair of piston rods. Three transverse drive beams are provided. Each drive beam is directly connected to an associated one of the cylinder housings. Three sets of floor slat members are provided. Each set is connected to an associated one of the transverse drive beams. The linear hydraulic motors are operated for moving the floor slat members in one direction, for advancing a load, and for retracting them in an opposite direction. Each cylinder housing has four fluid chambers. First and third chambers are interconnected and the second and fourth chambers are interconnected. This arrangement provides adequate force producing area with a relatively small diameter cylinder housing. Fluid passageways are formed in the piston rods. Transfer valves are incorporated in end portions of some of the linear hydraulic motors.

Abstract: A variable height column having a base, a midsection and an upper section. The base includes at least one upwardly extending guide shaft and the upper section includes at least one downwardly extending guide shaft. The midsection includes guide paths and bearings dimensioned for sliding engagement with the guide shaft. Hydraulic actuating means are provided to move the midsection vertically relative to the base and to move the upper section vertically relative to the midsection at the same rate to permit the uniform straightline extension and retraction of the column.

Abstract: This specification discloses a compact press tool which is capable of accommodating eccentric loadings without jamming or causing hydraulic fluid leakage.Specifically the press tool (1) comprises: a stationary element (2), a movable element (3) and an hydraulic ram (5) adapted to translate the movable element (3) relative to the stationary element (2). The hydraulic ram (5) has a first piston (7) fixedly connected with the stationary element (2), a second piston (9), axially spaced from the first piston (7), able to bear against the movable element (3), and a floating cylinder (10) sealed at one end by the first piston and at the other end by the second piston (9).

Abstract: A driving and extracting apparatus has a hammer frame within which a reaction mass is freely movable. The reaction mass is caused to reciprocate within the hammer frame by the selective application of drive pressure to opposite drive cylinders at a frequency corresponding to the natural frequency of the mass. A pneumatic spring at each end of the reaction mass prevents contact between the reaction mass and the ends of the hammer frame. Sensors in the hammer frame detect the position of the reaction mass and adjust the pneumatic springs accordingly.

Abstract: The cooperating double-acting piston/cylinder assistance assembly of the rack (20) incorporates a cylinder (24) firmly fixed to one end of the rack, in the extension of the latter and a stationary piston (40) fixed to one end of a hollow rod (42) whose other end (43) is fixed centrally in the steering casing (10), the hollow rod enclosing two separate fluid passages (45, 47) for supplying the chambers which are in opposition (46, 48), on each side of the piston (40), with actuating fluid under pressure coming from a distribution valve (30) mounted in the casing (10).

Abstract: The mechanism incorporates at least one assistance unit consisting of a fixed piston (44) supported by a hollow rod (43) and of a cylinder (32) housed in a bore (30) of the rack (11), the chambers (60, 61) being supplied through separate passages (62, 63) extending through the hollow rod (43). The mechanism, advantageously of the type with central output and with a double circuit, incorporates a double circuit distribution valve mechanism (20) for supplying selectively the pairs of chambers (60, 61) on each side of the pinion (12) of the rack (11).

Abstract: A compact lightweight engine or pump is constructed having a H-shaped piston, usually double acting. Each end of the piston has extending surfaces which form two moving sidewalls which act with two case sidewalls and a block-shaped head protrusion to define a working chamber with the appropriate top surface of the piston which moves to extract or add energy to the working chamber. Energy is transferred between the piston and a crankshaft by means of a slide block on the crankshaft and the inner surfaces of a pair of parallel walls forming the center of the "H" of the piston, whose opposite surfaces form the piston top surfaces. Through the use of suitable cams and valves, 4-cycle, 2-cylinder equivalent engines can be produced. With suitable porting, baffles, and/or auxillary compression means, 2-cycle engines can also be produced as well as air pumps.

Abstract: Disclosed herein is a power feed system for translating a rotary drill head along the length of a guide tower. The system utilizes a compound balanced area, end fed hydraulic cylinder as the actuating means. This arrangement provides a large ratio of fixed overall length to usable travel distance, balanced feed force in both directions, direct connection of the rotary head to the outer stage of the cylinder, and drift-free operation, all without the need for moving hydraulic hoses.

Abstract: A cylinder (3) is positioned to rotate on a fixed axle (1) in such a way that several leakproof chambers (3B, 3D) are formed: a second, longer cylinder (4) is positioned to slide along the first (3) and to turn on the fixed axle (1) in such a way that several leakproof chambers are formed (4A, 4B). Communicating pressurized fluids into the various chambers makes the cylinders (3, 4) turn a distance proportionate to a value x, and can make the second cylinder move axially along the first cylinder a distance proportionate to another value y; these values x and y being derived from several variables and sensors (10a to 10d) "read" the surface contours of the second cylinder (4), representing, for example, a function f (x,y).