Abstract: A compact, relatively low cost twin piston pump (20) especially adapted for the pumping of foods (e.g. juices, puddings or particulates such as stews and chilies) is provided which includes quick detach yoke and clevis assemblies (108, 124, 110, 126) connecting the reciprocable pistons (100, 102) with their associated hydraulic cylinders (116, 118), thereby permitting quick cleanup of the machine (20). A jacking screw plate (136) is used for forward mounting of the piston and cylinder assemblies (84, 86, 116, 118) coupled with the sleeves (42, 44) and associated pistons (100, 102). This permits precise adjustment of the working components of the machine, while eliminating expensive bearings and heavy duty framing members. The pump (20) is also provided with a slide plate-type valve (38, 184) for controlling output of product from the pump (20). In one valve embodiment (184) a two-part metallic slide plate assembly (192, 200) is sandwiched between a pair of apertured nylon plates (186).

Abstract: An end cap for a fluid cylinder having a central body portion and opposite end portions, flexible annular lips on the opposite end portions, an annular barb on one of the end portions for mating engagement with a groove with a cylinder for retaining the end cap in position, and an enlarged protuberance on the other annular portion of a diameter greater than the internal diameter of the cylinder for providing an interference fit therewith.

Abstract: The invention relates to a piston and cylinder unit whose piston rod is provided with a rack extending along it. The rack is in mesh with a ring of teeth (such as the teeth of a toothed belt or the teeth of a gear wheel) adapted to revolve about one axis (in the case of a gear wheel) or about at least two axes (in the case of a toothed belt). Such meshing engagement takes place in every position of the piston rod. When the piston rod is moved in the direction of its length the ring of teeth revolves about at least one axis and rotates a means for influencing the motion of the piston rod. Such means may for example be a liquid brake or a synchro transmitter connected with a NC unit controlling the supply of driving fluid to the piston and cylinder unit.

Abstract: A fluid-filled piston-cylinder unit with a tubular fluid-filled housing closed at one end and with a piston rod emerging from the other end comprising, for guiding the said piston rod, a guide bush which is sealed on the one hand against the inside wall of the housing and on the other against the piston rod by the use of seals. Provided at the inner end of the piston rod there is a guide piston. In order on the one hand to avoid surface pressure between the piston rod and the guide bush and on the other to achieve an adequate length of guidance for the piston rod itself, the guide bush is provided with at least one spacer extending in axially parallel manner beyond the seals and in the direction of the guide piston and the cross-section of which is substantially smaller than the cross-section of the guide bush.

Abstract: There is described apparatus for scabbling concretw which includes a hollow cylinder block having a top and bottom plate between which plates there is provided a smooth sided hollow cylindrical cylinder liner. The piston for reciprocation within the cylinder liner is also provided.

Abstract: An improved linear guiding mechanism with a standing part and a moving part which have respective uniform cross sections. A pair of spaced guiding channels is formed between these parts and respective linear ball bearings are arranged in both channels that interconnect the two parts. The channel walls are abutting the balls via steel bars extending along the channels. Preferably the standing part defines a cylinder in which a piston is moved and its shaft is connected to the moving part. The parts are made of light and soft material such as aluminum or plastic and manufactured by extrusion technique. The rather high variation of dimensions of such parts are compensated by means of biasing forces that press the channels together, and the biasing forces are sufficiently high to resist operational load. The length of the ball bearings is at least the half of the maximum stroke.

Abstract: A pump assembly (10) is disclosed which incorporates a double acting power end (12) to operate opposed single or double acting pumps (84, 102). First and second crossheads (30, 64) are reciprocated along the pumping axis (38) by rotation of the crankshaft (20) within the power end (12). A single acting pump is connected to each of the crossheads so that the pumping stroke of the pumps occur in opposite directions as the crossheads are reciprocated. This provides a constant loading of the power end in compression to most efficiently use the power end while realizing the advantages of using single acting pumps. The crossheads are guided for motion along the pumping axis by adjustable cradles (40, 46, 70, 72) which are initially secured to the frame of the pump assembly for limited motion and the crossheads reciprocated through their range of motion to align the cradles with the crossheads and subsequently rigidly secure the frame in the aligned positions as by fastening assemblies (52).

Abstract: The invention relates to a piston and cylinder unit in which there are means for precluding twisting of the piston rod in relation to the cylinder. A part of the piston rod outside the cylinder is connected with a support member which surrounds a major part of the circumference of the cylinder in every position of the piston rod. On both sides of the median plane containing the longitudinal axis of the cylinder there are respective support section having sliding and support surfaces. These sliding and support surfaces face in opposite directions about the axis of the cylinder and each run on a flat runner surface, also extending in the length direction of the cylinder, on a base which is not able to turn or otherwise move in relation to the cylinder.

Abstract: The plunger of the high - pressure cylinder has a driving ram coupled at one end. The coupling includes an annular groove on the plunger end and a two - piece collar with inner ridge. A cup - shaped collar retainer and a snap ring retain the collar in the ram. The coupling eliminates bolting. The open cylinder end is shouldered and grooved to receive a sleeve, a multi - piece key, a seat, and a seal which assemble to receive, center, and seal the plunger in the high pressure cylinder. The seal assembly eliminates the need for a bolted cylinder end.

Abstract: The invention relates to a fluid power actuator with a cylinder barrel containing a piston and having end caps through one of which the piston rod extends. The end caps have tie rod openings for the tie rods clamping the end caps together onto the ends of the cylinder barrel. Instead of being used for a tie rod, one of the tie rod openings has a guide rod running through it parallel to the piston rod. The guide rod is joined to the piston rod and moves with it to prevent the piston rod from turning in operation of the actuator. Part of the guide rod is within the opening during the full stroke of the piston.

Abstract: A reciprocating plunger pump is provided with a power section frame having open sides and vertical load-bearing walls spaced apart along the length of the frame. Separate, individually removable cradles are mounted on both sides of the frame directly to and extending between pairs of vertical walls. The cradles provide guides for linear reciprocating motion of main crossheads, which are attached to connecting rods driven by a rotating crankshaft. The cradles and the vertical walls are load-bearing so that the crankshaft may be rotated in either direction. The individually removable cradles provide easy access to both sides of the power section of the pump for inspection and maintenance of the power section components.

Abstract: A slide-like drive or feed unit comprises a housing with a piston and cylinder actuator therein. A piston rod extends out of the housing and is joined with a guide rod that runs in a guide hole in the housing. The end of the guide rod remote from the connection is used for mechanical connection with a load. The guide rod bears various fittings for controlling the drive unit. The output drive part, consisting of the piston rod and the guide rod, of the drive unit may be designed with an entrained fluid connection point, that is supplied with fluid from a pipe running in a hole in the housing.

Abstract: A piston drive for use in diesel engines with a high specific liter output wherein the piston comprises discrete sealing and guiding sections and is constructed, configurated and assembled in such a way that the flow of power from the combustion zone takes place along straight paths directly from the crown to the connecting rod without causing any bending and/or other deformation of component parts of the drive. The piston drive allows for achievement of higher output, without increasing the stroke volume of the cylinder, by using relatively inexpensive piston sections and without reducing the E of the engine.

Abstract: Attitude control mechanism for a flexible bag component of a composite pneumatic chamber including a fixed section over which an inturned portion of a flexible bag pneumatic chamber section rolls includes a cantilever bag attitude control stem having its root anchored in a mounting closing the end of the flexible bag remote from the rigid pneumatic chamber section and extends through a central guide aperture of at least one frame mounted within the rigid pneumatic chamber section for substantially linear reciprocation guidance so as to prevent appreciable buckling of the flexible bag as it is contracted axially by movement of the mounting carrying the stem toward the rigid pneumatic chamber section.

Abstract: Submergible pumping apparatus for use in an oil or other well comprises, in a self-contained downhole unit, a double-acting reciprocating positive displacement pump for pumping well fluid, a reservoir containing power fluid for operating the double-acting pump, a rotary motor-driven positive displacement pump for supplying power fluid under pressure from the reservoir to operate the reciprocating pump, and a control valve for properly directing high pressure power fluid from the rotary pump to the reciprocating pump and from the reciprocating pump back to the reservoir so as to provide stroke reversal of the reciprocating pump.

Abstract: An apparatus for expanding tube ends in a tube sheet of a heat exchanger tube bundle comprises a mandrel which can be inserted into the tube end and an expansion pressure generator connected to said mandrel. A source of filling liquid is also connected to the mandrel to the expansion pressure generator which has a port for the filling liquid selectively blocked by the plunger of the expansion pressure generator so that problems with check valves for the filling can be obviated.

Abstract: A fluid operated device comprising an elongated housing defining an elongated interior cylinder and an elongated slot formed along one side of the housing and open to the cylinder. A piston is longitudinally, slidably mounted in the cylinder and forms a first chamber in the cylinder between one end of the housing and one end of the piston and a second chamber between the other end of the housing and the other end of the piston. Fluid seals are provided around each end of the piston. In addition, an elongated band constructed of a magnetic material is secured within the cylinder and is of sufficient width so that the band covers the housing slot. A pair of elongated flexible magnets are secured to the housing along the slot to magnetically attract the band against the housing and thus sealingly close the housing slot along the cylinder chambers.

Abstract: A sealing bush unit for sealing a reciprocating machine part has an annular bush with an inner diameter exceeding an outer diameter of the reciprocating pump to form a radial gap therebetween, a radially outer surface arranged so that a working pressure acts upon the same and the bush radially displaces towards the reciprocating part, one flat end face facing toward a suction zone and providing an abutment for the sealing bush, and another end face facing toward a pressure zone, wherein a pressing ring is arranged adjacent to the other end face of the bush with axial play relative to a machine housing.

Abstract: An elevator system including an elevator car, and a hydraulic jack. The elevator car includes a metallic tunnel structure which extends vertically upward therethrough, with the hydraulic jack lifting and lowering the elevator car via contact with an end plate secured to the upper end of the tunnel. Stabilizer means in the tunnel, fixed to a predetermined portion of the hydraulic jack, coacts with the inner sidewalls of the tunnel to provide intermediate support and centering forces which promote coaxial alignment between the hydraulic jack and tunnel.

Abstract: A fluid power driving unit for transport and other purposes is made up of an non-magnetic cylinder which may be joined up with a fluid power supply. Within the cylinder there is a glanded free piston having an inner magnetic system for moving an outer runner supported on the outside face of the cylinder, by way of a further magnetic system in the runner. The inner and outer magnetic systems are designed so as to be clear of the inner and outer faces of the cylinder. The cylinder is made up of a number of separate cylinder lengths whose ends are overlapping and furthermore each cylinder length has a stiffening and reinforcing rail, which rails are joined together at their ends and may be undone from each other if desired.

Abstract: The invention relates to a hydraulic engine with radial pistons, comprising girders which transmit the thrusts of the pistons and rest against strips secured to the cylinder block.The surface of the cylinder block has a degree of roughness at least equal to the following values given in reference to the currently applied norms 0.25 .mu.RA; 15 .mu.Rt; and 8 .mu.Rp.The invention finds its application in the production of a reliable engine.

Abstract: A reciprocating fluid device is provided in which dynamic stresses in the weld between the cylindrical tube and the base thereof are reduced by prestressing the tube proximal to the weld prior to welding.

Abstract: A hydraulic actuator cylinder primarily for the actuation of aircraft landing gear in which the rod end is made integral with the piston rod with the attaching threads positioned inside the cylinder. The piston head is designed to float on the piston rod plus or minus the amount of adverse tolerance conditions that are possible in the landing gear installation.

Abstract: A working cylinder for pneumatic or hydraulic pressure media for producing a rectilinear operating movement. The working cylinder has at least one operating chamber which receives the pressure medium and includes one stationary rigid housing part which preferably has the medium feed inlet thereon and a movable rigid piston part, both of which are interconnected pressure-tight by an elastically deformable envelope device and are guided together. The envelope device is constructed as a rolling-bellow diaphragm and is substantially closed all around and defines the operating chamber which receives the pressure medium.

Abstract: Oil-tight flexible partitions are provided to prevent oil leakage to the working gas of a Stirling cycle engine along the piston rods from oil-lubricated reciprocating seals. The upper and lower chambers formed in part by the flexible partitions are interconnected through an oil filter for preventing oil leakage to the upper chambers while minimizing the pressure differential across the flexible partitions by allowing gas flow between the upper and lower chambers.

Abstract: A control actuator for a turbocharger comprises a diaphragm-displaced actuator rod projecting outwardly from an actuator housing through a spring-biased retainer which sealably permits axial and angular rod movement for variably positioning a turbocharger wastegate valve.

Abstract: A hydraulic actuator, readily assemble and disassemble, which can be used for effecting actuation of food processing machinery or bulk bait or other commodity dispensers. Since it is necessary that such devices be safe and non-polluting, components which come in contact with the hydraulic fluid can be made of plastic so that tap water can be utilized as the hydraulic fluid.The actuator is made readily assemble and disassemble by including devices for quick and easy sealing and locking of the component parts. These devices have only a minimal number of subcomponents.

Abstract: An improved jam-proof control including a cylinder-piston assembly in which the piston is controllably positioned within the cylinder to perform the control function and in which the piston rod which extends through the cylinder wall is enveloped by a deformable sleeve so that when the piston rod is deformed by sharp impact, the piston rod is permitted to continue to reciprocate within the housing due to the deformation, either due to frangibility or softness, of the piston rod sleeve.

Abstract: A hydraulic jack suitable for powering a large load such as an elevator or a drawbridge. In a first embodiment the hydraulic jack telescopes at a uniform rate over its entire distance of extension and includes a plunger member telescopingly enclosed within a sleeve member which, in turn, is telescopingly enclosed within a cylinder member, with the cylinder member encircled by an oil jacket within which the cylinder member is capable of limited angular movement. Means are provided for angularly aligning the various members within one another. Means are also provided to restrict the flow of hydraulic fluid as the hydraulic jack reaches a limit of its travel. Hydraulic jacks in accordance with the present invention can be coupled together in systems to lift large loads.

Abstract: The support jack comprises a cylinder and a piston which define therebetween a variable-volume chamber. An inlet aperture and an outlet aperture for control fluid are provided for the chamber. Escape passageways are provided in evenly-spaced relation about the rod of the piston and put the chamber in communication with the annular space between the fixed and moving component parts of the jack and open radially onto said space. These passageways create pressure drops which are higher than the pressure drops due to the annular space.

Abstract: A locking wire joint in a hydraulic cylinder between the barrel and bearing which also prevents rotational movement therebetween; including a locking wire having a U-shaped end, the wire being insertable through a slot in the cylinder barrel into a pair of mating annular grooves; with the u-shaped end engageable with the slot to lock the connected cylinder parts against rotation.

Abstract: A reciprocating fluid device is provided in which dynamic stresses in the weld between the cylindrical tube and the base thereof are reduced by prestressing the tube proximal to the weld prior to welding.

Abstract: A two stage vacuum break or fluid motor device of the type used to control choke valves of internal combustion engine carburetors. The motor uses a single diaphragm in which the fluid motor plunger operates in a first stage in response to movement of a portion of the diaphragm and in a second stage in response to movement of the entire diaphragm. The stages of movement are under the control of separate sources of manifold pressure which may be made available to the device independently of each other. The two stages of operation may be used to control one or more choke valves through a single output plunger or to control a pair of output plungers movable independently of each other.

Abstract: A valve actuator is capable of being mounted on a valve in alignment with a valve stem which can be moved to open and close the valve. The actuator includes a hydraulic cylinder and a piston slidably mounted within the cylinder. A piston rod is joined at a first side of the piston and extends outwardly of the cylinder toward the valve to be joined to the valve stem. A high pressure gas accumulator is mounted on the cylinder and includes a generally spherical shaped pressure wall which is intersected by the cylinder to locate an end of the cylinder within the accumulator to allow communication of the interior of the accumulator with a second side of the piston. Hydraulic oil acting on the first side of the piston opens the valve against high pressure gas within the accumulator and evacuation of the hydraulic oil allows the high pressure gas to act on the second side of the piston to rapidly close the valve.

Abstract: A large bore, long stroke, low friction, hydraulic actuator having dual hydrostatic bearings permitting elastic deformation of the piston rod while inhibiting metal to metal contact between either the piston head or the deformed piston rod and the walls of the hydraulic cylinder. The actuator employs a safe and highly reliable metering orifice cushion decelerating means. Piston displacement is constantly monitored by a completely internal, magnetostrictive, sonic delay line displacement measuring means.

Abstract: A cable string for replacement of a prior art sucker rod string used in pumping oil wells with a pump jack unit. The cable string is comprised of a plurality of individual joints of multi-strand material connected together by a coupling member. Each individual joint has a pin member at each extremity thereof. Each joint is affixed in series relationship to another joint by the coupling member. The coupling member has a box connection at each extremity thereof. Hence, the pin member of adjacent joints are connected together by the box connection of the coupling member to provide a string of flexible cable joints of sufficient length to extend from proximity of the pump jack downhole through the borehole into proximity of the downhole pump. When a plurality of cable joints are connected together, the resulting length thereof is equivalent to the length of a standard solid metal joint of sucker rod.

Abstract: A piston for use in a hydraulic or other fluid operated device having sealing means intended to prevent the passage of working fluid between the piston and cylinder in which it moves consisting of the combination of at least one O ring or other sealing device arranged around the circumference of the piston and left and right hand intersecting helical channels formed over the length of the surface of the piston wall between the sealing device and the end of the piston subject to pressure of the working fluid. The helical channels act both to retain lubricating fluid and to provide a partial seal against the passage of working fluid between the piston and the cylinder, substantially complete sealing being effected by the sealing device.

Abstract: A device for controlling two output elements pivotally mounted with respect to two stationary elements is provided with two coaxial rectilinear double action pressure fluid jacks. The two stationary elements are respectively secured to the ends of a stationary outer longitudinal elongated member while the two pivoting elements are respectively secured to the ends of pivotal inner longitudinal elongated member coaxially arranged in said outer member. The jacks are of annular configuration and formed between the outer and inner aforesaid members with a common median bottom and annularly slotted cylinder-heads remote from each other. The tubular piston rod of each jack extends in leak-tight manner through the annularly slotted cylinder-head and is angularly positioned on the one hand, with respect to the corresponding stationary element by a first set of guides and on the other hand with respect to the corresponding pivoting element by a second set of guides forming an angle relative to the first set of guides.

Abstract: A lifting boom having three telescopic sections. A hydraulic ram has the piston rod free end connected by a horizontal pin movable in guide slots at the rear of the base section. A deflection limiter is axially slidable on the piston rod, and is less high then the base section. The rear of the ram cylinder is pin connected by horizontal pins to the mid section, and has a transverse ram cylinder plate attached to it. Pull rods are connected to the deflection limiter and pass forwardly through the transverse plate, having detents at their forward ends beyond the transverse plates. A pair of chains extends from the base section forward and around sprockets at the rear of the mid section, being attached to the rear of the fly section, a further chain extending thence forwardly and around a sprocket on the front end of the ram cylinder, and thence rearwardly to an anchor on the base section; the ram sprocket has a roller portion which rolls on the fly section bottom plate to support the ram cylinder.

Abstract: A loading arm apparatus having a displaceable main shaft formed as a fluid operable cylinder with a fixed piston which may be clamped at any position along its displacement by a fluid operable clamping means operable against its wall. A guide rod placed in a common block with the main shaft can be clamped also by a separate clamp simultaneously with the main shaft. As a result, the main shaft can be mounted with a large play.

Abstract: A sealing device is mounted in the bore of a housing in which a piston is slidably mounted. A fluid tight seal is mounted between a shoulder of the housing and a washer circumscribing the piston. The washer has an outer diameter substantially equal to that of the bore and comprises an outer annular groove in which at least one fixing element is disposed. Each fixing element comprises a tongue-shaped portion penetrating through a corresponding radial bore defined at the bottom of the annular groove. When the piston is inserted through the washer, the fixing elements are moved radially towards the outside of the washer through the tongue-shaped portions and penetrate into a facing annular groove formed in the bore.

Abstract: An oil hydraulic power steering device of the rack and pinion type which includes a rack rod supported for lateral oscillation about a fulcrum adjacent one end thereof and a power actuator comprised of a piston secured to the rack rod, an outer cylinder, and an inner cylinder in which the piston is slidably fitted and which is floatingly supported in the outer cylinder. The device further includes a spring for normally biasing the rack rod against the pinion and a mechanism for engaging the normally free end of the rack rod while laterally displacing the rod end to increase the backlash in the rack and pinion gearing as the rack rod approaches the end of its stroke. There is no excessive pressure of contact occurring between the meshing gear teeth and the backlash is self-adjustable as the teeth wear down.

Abstract: A shaft bearing and seal in the form of a housing member having a bronze bearing press-fit into the housing member which has a counterbore for receiving packing so that the packing is confined by the counterbore and has a radial face in contact with a shoulder on the housing which extends radially outwardly from an end face of the bearing. Two studs are adapted to be welded to a frame and facilitate application of adjustment pressure to the housing member in an axial direction for compressing the packing seal against the frame.

Abstract: A seal assembly for use in a cable cylinder to form an effective seal about a generally cylindrical cable section. The seal assembly includes primary and secondary seal members disposed on opposite sides of an alignment sleeve and a retainer sleeve, all of which are disposed within the central bore of a gland member. The central bore includes a plurality of cylindrical bore portions and means cooperating with the retainer sleeve for retaining the seal members and alignment sleeve within the gland for easy insertion and removal thereof.

Abstract: A hand-operated pump includes a cylinder and a reciprocating plunger. The plunger is made from plastic and includes a piston, a stem and an enlarged hand grip which are all molded integrally with one another so as to form a one-piece unit. The end of the cylinder is closed by a pair of separable caps which are adapted to be slipped sidewise onto the plunger and attached to the cylinder after the plunger has been assembled with the cylinder.

Abstract: A method of making an end connection to a fluid power cylinder and product wherein a hollow metallic cylindrical tubing is deformed into a step shape to conform to a channel shaped recess provided in the shank of the end cap.

Abstract: A pneumatic jack comprising a cylinder having a removable cover, an inlet for pressurized gas near the bottom of the cylinder, a piston having a resilient piston cup within the cylinder and positioned for vertical movement therein, the cover including a centrally positioned piston rod bushing and at least two laterally offset stabilizer rod bushings, the bushings extending above and below the cover, a piston rod secured to the piston and extending through the piston rod bushing, and at least two stabilizer rods also secured to the piston and extending through the stabilizer rod bushings, and helical springs surrounding each of the stabilizer rods and engaging the piston and the cover for urging the piston downwardly within the cylinder.

Abstract: An actuating cylinder for a magnetic rail brake unit on a vehicle has a piston slidable within a cylinder and the piston has an end position at the head end of the cylinder. A pair of concentric conical mating surfaces are provided on the piston and cylinder head end so as to be engageable with each other to stop the piston in the end position.

Abstract: A springless impact device including a piston-cylinder mechanism having at least one preselected coacting port and passageway operatively connected to a valve pressurized fluid control apparatus which selectively feeds and exhausts pressurized fluid to and from the device in a predetermined manner. There is an area differential between the top and bottom ends of the piston head. The device includes an inverted "U"-shaped seal ring on the piston head which functions as a one-way check valve to effect piston reciprocation in coaction with the area differential on the piston head.

Abstract: The actuator piston has a generally cylindrical central projection about the exterior of which a similarly formed rolling diaphragm is closely fitted. The piston rod can turn freely, to avoid any twisting of the piston and diaphragm, and can also be axially withdrawn from its engagement with the piston. Return spring means extends into the diaphragm enclosed part of the piston.