Abstract: A piston rod includes a piston end that is removably attached to the piston rod body. A sleeve extends around the piston rod body and interfaces with a seal disposed within a pump. A ring extends from the piston end defines at least a portion of a socket formed in the piston end for connecting the piston end and the piston rod body. The ring has a cylindrical ring exterior and the sleeve rests on the cylindrical ring exterior such that the shank, the ring, and the sleeve radially overlap each other.

Abstract: A piston rod for pumping paint includes an elongated cylindrical stem and a piston rod cap connected to the cylindrical stem. The cylindrical stem is formed from metal and has an outer diameter that is uniform along most or all of a length of the cylindrical stem. The piston rod cap is cylindrical and formed from metal. The piston rod cap includes an annular top portion that has an outer diameter that is larger than the outer diameter of the cylindrical stem, an annular bottom portion that has an outer diameter that is larger than the outer diameter of the cylindrical stem, and an exterior recess located between the annular top and bottom portions. The recess has an outer diameter that is smaller than the outer diameters of the annular top and bottom portions.

Abstract: A steering rack piston assembly (10) employed in a power steering rack and piston assembly. The assembly includes a shaft (bar) (11) upon which there is mounted a piston (12). The shaft (11) has a longitudinal axis (13), that is also the longitudinal axis of the piston (12). The piston (12) has an outer groove (15) that receives a seal (16) that slidably engages in a cylindrical surface of an outer housing that is not illustrated. The piston (12) and shaft (11) move along the axis (13) relative to the outer housing as a result of pressure within the fluid located on opposite sides of the piston (12).

Abstract: An apparatus and method for coupling a piston to a rod to form a cylinder assembly are provided. The piston has a tapped bore extending therethrough for coupling to a first threaded region of the rod. The rod end extends beyond the piston member and includes a second threaded region for coupling to a tapped bore of a retaining member. The piston member is coupled to the rod member at a low torque, e.g., up to about 1000 Nm. An external thread of each of the threaded segment of the piston bore and the first threaded region of the first portion of the rod member may be formed with a root radius of greater than 0.125 pitch or with MJ class thread. The retaining member may include setscrews offset from one another for frictional engagement with the rod end. The thread pitch between the rod and the piston may be coarser than between the rod and the retaining member.

Abstract: A fluid pressure apparatus includes a piston, and a packing provided on an outer circumference of the piston. The packing includes a support ring made of a low-friction material, and a ring-shaped seal member mounted to the support ring. When at least a certain amount of transverse load acts on the piston, an outer circumferential surface of the support ring abuts against an inner circumferential surface of the slide hole, whereby the piston is prevented from contacting with the inner circumferential surface of the slide hole.

Abstract: A swing-type reciprocative compressor is capable of maintaining long durability and preventing propagation of heat to the large end portion of a piston, even under high-compression. In the reciprocative compressor having a swing-type piston mechanism, a piston ring is attached to a piston ring groove to seal between a piston and a cylinder. A ring groove is provided separately from the piston ring groove on the outer circumferential side of the piston and on the crankshaft side of the piston ring groove. A guide ring restricted from moving in a radial direction and shaped like a skirt opening toward the crankshaft side is provided in the ring groove.

Abstract: The invention relates to a hydraulic cylinder piston comprising a piston rod and a piston connected thereto. In accordance with the invention, the piston can be tensioned with respect to the piston rod via a screw system comprising two threaded rings, with the inner threaded ring of the two threaded rings comprising a removable tensioning element for the application of the pre-tension and with the outer threaded ring being movable relative to the inner threaded ring.

Abstract: An improved follower packing unit for a grease gun is disclosed. The unit includes a hollow annular body of elastomeric material having a front wall, an annular side wall and a rear wall defining a cavity in the body. Rigid front and back structural supports rigidly support the front and rear walls of the elastomeric seal. The elastomeric seal and the front and back structural supports are fastened together to prevent separation and to form a unitary follower structure movable as a unit on a follower rod. The annular side wall of the elastomeric seal is resiliently deformable under pressure in a radial direction for sealing tightly against an interior surface of the barrel of the grease gun or against the interior surface of a tubular cartridge loaded in the barrel of the gun.

Abstract: Drywall mud pump for pumping drywall joint compound, for instance, from a bucket into a drywall tool. The pump includes a cylinder, a piston, a rod, and a means, or a connection structure between the piston and the rod, for allowing the end of the rod to move laterally relative to the piston. Some embodiments have an elongated hole in the piston that receives a flattened or reduced diameter end of the rod, for example. Different embodiments include a pump head through which the rod passes, a handle, a linkage, a means for allowing the rod to pivot, a shortened guide, a means for preventing the piston from rotating about the rod, or a combination thereof. Pistons may include, for example, passageways with straight and curved sides, a flapper, an elongated washer to block the elongated hole, and a means for controlling the rotational position of the washer.

Abstract: The present invention discloses a piston device which is disposed in a cylinder. The cylinder has a chamber including a bore and an inner wall. The piston device comprises a piston body and at least an annular ring. The piston body has a top side and a bottom side, the diameter of the piston body is smaller than the bore, and either one of the top side or the bottom side has a convex portion. The annular ring is clamped to the top side or the bottom side by engaging said convex portion, and the annular ring has a diameter slightly larger than the diameter of the piston body. While said piston therein moves reciprocally at which the axial direction of the cylinder, the annular ring slides against the inner wall but the piston body has no contact with said inner wall.

Abstract: A method of installing a piston position sensor proximate to a closed end of a hydraulic cylinder is provided. The sensor is attached to the face of a piston and that piston/sensor combination is inserted into the cylinder tube to position the sensor in the desired location. When properly located within the cylinder tube, the sensor is affixed to the cylinder tube by means of beveled holes in the sensor that receive bolts threadedly inserted through the cylinder tube to further properly align the sensor within the cylinder tube. When so affixed, the sensor is then detached from the piston so that the piston can thereafter move independently of the sensor. A fixture is also used that allows the assembler to accurately align the angular orientation of the sensor prior to being inserted into the cylinder tube.

Abstract: Disclosed is a gas cylinder, for improving sealing characteristics of the gas cylinder and improving convenience in manufacturing, including: a valve having a gas opening/closing pin at a through hole in its center, for intermittently passing a gas, and additionally having a valve dividing body seated on a groove approximately in a lower part of the through hole; a spindle to an upper inside of which the valve is inserted; and a piston inserted to an inside of an open cylinder of the spindle, and having, a step threshold formed at a predetermined distance from an upper end, to which an O-ring for maintaining sealing is fit, and having another step threshold ranging from a lower side of the step threshold to a lower end on an inner lateral surface of the piston, to which an O-ring is fit.

Abstract: A method of installing a piston position sensor proximate to a closed end of a hydraulic cylinder is provided. The sensor is attached to the face of a piston and that piston/sensor combination is inserted into the cylinder tube to position the sensor in the desired location. When properly located within the cylinder tube, the sensor is affixed to the cylinder tube by means of beveled holes in the sensor that receive bolts threadedly inserted through the cylinder tube to further properly align the sensor within the cylinder tube. When so affixed, the sensor is then detached from the piston so that the piston can thereafter move independently of the sensor. A fixture is also used that allows the assembler to accurately align the angular orientation of the sensor prior to being inserted into the cylinder tube.

Abstract: A slide-type cylinder coupling which is suitable for the quick connect/disconnect attachment of a lift piston on a pedestal lift cylinder to a lift pedestal on a load cup or HCLU station of a chemical mechanical polishing apparatus. The cylinder coupling includes a coupling bolt which is provided on the lift piston and a coupling bracket which is provided on the bottom surface of the lift pedestal. The coupling bolt is slidably inserted in the coupling bracket to removably connect the lift cylinder to the lift pedestal. The coupling bolt is slidably removed from the coupling bracket to disconnect the lift cylinder from the lift pedestal for replacement or maintenance of the lift cylinder.

Abstract: A piston assembly for use in a hydraulic cylinder includes a piston head configured to slide axially within the hydraulic cylinder in response to changes in hydraulic pressure. The piston head has an axial through-hole. A piston rod has a proximal end axially abutting the piston head and a distal end extending outward through an end of the hydraulic cylinder. The proximal end of the piston rod has a threaded bore co-axial with the axial through-hole in the piston head. A bolt has a bolt head and an unthreaded shank portion adjacent the bolt head and a threaded shank portion away from the bolt head. The bolt secures the piston head to the proximal end of the piston rod when the bolt shank is inserted through the axial through-hole in the piston head and is threadingly engaged in the threaded bore in the piston rod. An annular washer is positioned and held captive on the unthreaded portion of the bolt shank between the bolt head and the piston head.

Abstract: A fluid driver consisting of a piston support lug having a forward end and a rearward end, a clamp ring engaging disk having a forward end and a rearward end, the rearward end of the piston supporting lug being homogeneously fused with the forward end of the clamp ring engaging disk, the homogeneous fusion extending the rearward end of the piston support lug forwardly from the forward end of the clamp ring engaging disk, the homogeneous fusion resisting fracture, bending, and breakage of the fluid driver.

Abstract: Piston unit for an internal combustion engine, especially for a large diesel engine, comprising at least three main parts located in successive order in the direction of the longitudinal axis of the piston and to be connected to each other. The piston unit includes a uniform upper part (3), which defines, when installed within a cylinder of the engine, a combustion chamber from the side of the piston and which is fixed inside of the piston at its central region to a middle part (2) of the piston unit preferably by means of a screw (4) or the like. At least the main part of, preferably all of the piston ring grooves (7) are arranged on a middle part (2). In addition the upper part (1) is selected to be of a material with better heat resistance than that of the middle part (2) and of a lower part (1).

Abstract: A piston having a body member made from plastic material adapted for mounting to a piston rod for axial movement with the piston rod in a hydraulic cylinder under high working pressure conditions is disclosed. The plastic piston body member has a first axial end portion, an opposite second axial end portion, an outer circumferential surface portion adapted to be located in intimate relation with a cylinder wall of the hydraulic cylinder when the piston is positioned for axial movement therein, and an inner peripheral surface portion defining a centrally located axially extending aperture through the body member adapted for cooperatively receiving a mounting portion of the piston rod, one of the axial end portions being positioned to abut an adjacent shoulder of the piston rod when the mounting portion of the piston rod is located in a fully received position in the aperture.

Abstract: A method is described of making a piston crown, the method comprises the steps of making a lower crown portion, the lower crown portion also having piston pin bosses, making an upper crown portion which co-operates with the lower crown portion and joining the lower and upper crown portions together to form an oil retaining chamber. The upper and lower crown portions may be made by a precision casting technique in a ferrous alloy and may be joined by a brazing operation. The piston crown may be part of an articulated piston or may further include integral skirt portions.

Abstract: In the embodiment shown, the body is formed of cast aluminum, and is devoid of clean-out holes in the upper and bottom ends thereof. Instead, the clean-out holes are formed in the outer, annular wall, through an annular recess formed in the outer wall, To close off the clean-out holes, a steel band is nested in the recess, in circumscription of the body. Further, the steel band has grooves formed therein in which to accommodate piston rings.

Abstract: A piston of a hydraulic ram, actuator or the like for fitting onto an end section of a straight rod with the assembly for fitting into to travel along a center cavity of a cylinder under the urgings of fluid under pressure that is introduced into that cylinder, the invention consisting of a number of piston component elements including upper and lower piston halves; retaining ring sections or halves, that are for assembly as rings in retaining ring grooves that have been formed around the rod end; at least one O-ring groove that includes an O-ring seal fitted therein; a piston spacer; a seal; and a pair of piston bearings, one for fitting over each piston half. In a practice of the method of the invention to assemble a piston onto a rod end, the piston component elements are sequentially fitted together to assemble the piston Which piston assembly can be accomplished in the field by even an untrained operator using only their hands, or using a minimum hand tools, such as a screw driver.

Abstract: An air pump for use with a chain-driven bicycle having a free wheel. The pump assembly comprises a pair of opposed cylinders and a double-ended piston rod mounted in a housing. The piston rod has a bearing slot, which engages a crank pin on a crankshaft driven by a sprocket. Rotation of the sprocket reciprocates the double-ended piston rod in the cylinders. The cylinders are each integrally formed with a manifold that uses an elastomeric band covering a passage from the cylinder interior to inside the manifold as a one-way valve. An enlarged diameter skirt on each cylinder allows air to enter the cylinder on each intake stroke. A cap defining the piston head is locked onto each piston and holds a seal in place on the piston. An integral clamp assembly allows the pump to be removably mounted on a bicycle chain stay. The lower run of the bicycle drive chain engages the drive sprocket of the pump assembly, and a chain retainer is used to maintain the engagement of the drive chain with the drive sprocket.

Abstract: The piston (6) guided in a cylinder (1) has at least one split so-called trapped piston ring (10) disposed in an annular groove on the piston. The circumferential face (12) of the ring remote from the inner face (11) of the cylinder bounds in the annular groove a space (23) which is acted upon by the pressure of the gas in the compression space. Starting from this circumferential face (12) the piston ring exhibits two radial boundary areas (13, 14) parallel with one another, of which the area (14) next to the compression space extends over part of the radial width of the ring. The piston ring (10) is guided by its two parallel boundary areas (13, 14) to slide against corresponding areas in the annular groove. The remaining area (16) of the piston ring next to the compression space, starting from the circumferential face (15) next the inner face (11) of the cylinder, forms a wedge face which extends at an angle of from 5.degree. to 15.degree.

Abstract: A gas delivery apparatus which includes a vehicle fitted with multiple compressed gas cylinders, each provided with a free piston, along with a separate liquid reservoir cylinder, for sequentially displacing the gas located on one side of the free piston in each of the gas cylinders with liquid from the reservoir introduced on the opposite side of the free piston and relocating the free piston disposed in each gas cylinder by residual gas pressure.

Abstract: A drain clearing device having a transparent and hollow cylindrical body, a piston plunger assembly partially disposed in the cylindrical body, piston plunger assembly support attached to an upper end of the cylindrical body, and a drain seal attached to a lower end of the cylindrical body. The drain seal is formed from medium density, closed cell sponge rubber.

Abstract: The Assembly comprises a piston body having a longitudinal axis to which are added, in interlayered fashion, separate, piston-ring lands and spacers. In one embodiment, a pair of rider rings are coupled to the piston body, in spaced apart locations, to guide the piston assembly in reciprocation, and to space the piston-ring lands away from the surface of an enclosing cylinder. The lands have a diameter which is slightly less than that of the rider rings. The lands are formed of ceramic to offer, thereby, a substantially wear-resistant surface to the piston rings which are set between pairs of the lands, and about the spacers. The body is centrally bored and tapped, and the lands and spacers are centrally apertured; a headed bolt has the shank thereof in penetration of the lands, spacers and rider rings, and threadedly engaged with the tapped bore, to secure the assembly together.

Abstract: The horizontal reciprocating compressor is provided with a cylinder, piston and piston rod connected to the piston. An eccentric ring is mounted eccentrically within the piston and rotatably receives the piston rod. Rotation of the eccentric ring from time to time serves to move the axis of the piston rod vertically relative to the axis of the piston so as to eliminate runout.

Abstract: A servomotor is actuated by a pressure medium and has a piston reciprocated in the cylinder, the piston being mounted by a piston rod that extends through a cylinder end wall. The piston has a piston member bearing against the cylinder and is mounted for radial movement relative to the piston rod by a pair of piston guide plates that extend on opposite sides of the piston member. The guide plates are mounted by the piston rod for axial movement therewith.

Abstract: A piston has a first endwall, a second endwall and a tubular ceramic sidewall extending between and forming a closed cylinder with the endwalls. The piston does not include a piston ring. The first endwall is substantially flexible and is releasably interconnected with the second endwall by means of connection with an extended portion of an associated piston rod mounted in a hub of the second endwall. As a result, the first endwall is urged into a concave configuration. The ceramic piston sidewall is mounted for reciprocation within a ceramic cylindrical wall. An anti-rotation device is provided to limit rotation of the endwalls relative to the sidewall, and another anti-rotation device is provided to limit rotation of the hub relative to the piston rod.

Abstract: A piston slidably inserted in the cylinder of a gas pump, said cylinder having a cylinder head and an outlet valve located near the cylinder head. The piston comprises a cylindrical piston body and a wear-reducing sheet wound one time around the piston body. The opposing edges of the wear-reducing sheet are cut stepwise, such that at least two gaps are formed between the edges, which are set apart from each other for a predetermined distance in the circumferential direction of the piston body, and such that no gap portion is formed between the edges, which connects the two gaps and extends substantially in the circumferential direction of the piston body.

Abstract: A sealing device particularly suitable for sealing pistons of working cylinders and for sealing two machine components which can slide against one another is disclosed. A conventional sealing element consisting of low-friction, but not very elastic material, such as PTFE plastic material, and resting on an elastic support, is used. The cross-section of the sealing element in a direction of the sliding motion is U-shaped and encircles the support. The dimensions of the support and the sealing element are determined such that the support exerts prestress forces on the sealing element which try to bend the rim areas of the sealing element outward against the sliding surface for the sealing element. Consequently, an additional force component, directed toward the sliding surface, results for the pressure force which is exerted on the sealing element by the support and functions as a sealing force.

Abstract: Piston (25) and/or gland (20) structure for a hydraulic actuator (10) includes a plurality of deformable plate members (40, 45, 90 and 95) interconnected at a plurality of locations thereon by frangible fasteners (50). The fasteners are highly loaded in shear and fracture under conditions of abutment of the piston or gland with a ballistically damaged portion of the actuator thereby allowing the plate members to deform around the damaged portion, thus preventing jamming of the actuator.

Abstract: A swash plate pump includes a housing and cylinders arranged in a circular pattern around the drive shaft. Piston rods are pivotally connected at one end to the swash plate and mechanism surrounding the drive shaft and axially slidable along it controls the angle of the swash plate. The opposite end of each piston rods is fixed to a piston. In one embodiment, each piston rod is locally reduced in cross-sectional area adjacent its piston to compensate for disparity in arcuate motions of the opposite ends of the piston rod and in another embodiment, the cylinders are mounted in ball joints in the housing to compensate the disparity. One end of the housing may be formed as a manifold and double seals are provided between the compression side and the drive side of the pump.

Abstract: An actuator for a hydraulically actuated caliper disc brake having a brake shoe comprises an actuating piston of two-part construction mounted for displacement in a cylinder and acted upon by a pressure fluid. The actuator has a cup-shaped member of cast steel, the bottom of which is acted upon by the pressure-fluid, and a cylindrical core of a mechanically resistant and heat insulating material removably coaxially and having an end face pressed against the brake shoe when actuated. A plurality of thin discs of mechanically resistant material are secured to the end face of the core adjacent to the brake shoe for reducing heat transfer from the brake shoe to the piston.

Abstract: The Compressor is small, compact and lightweight in that it is formed of the barest essentials. It has a pair of in-line cylinders, with pistons reciprocatable therein, and the crankshaft, having only one crank, is drivingly coupled to one of the pistons. The other piston is fastened to the crank-driven piston, in spaced-apart disposition, for a common reciprocation of the two. One of the cylinders serves as the crankcase.

Abstract: An improved piston for operation within a cylinder. The piston includes a main piston body having a primary cylindrical surface, a first end, and a secondary surface of smaller diameter, the secondary surface of smaller diameter is disposed between the primary cylindrical surface and the first end. At least one piston ring is disposed and captured in an operational position about the secondary surface of the piston body by a releasably mounted cap positioned on the first end of the piston body.

Abstract: A connection between a first member (e.g. a piston rod) and a bore in a second member (e.g. a piston) which is formed by two spaced grooves on the first member at least one of which is in register with one of two spaced steps in the bore, and a compression clip mounted in each groove such that when the groove and the step are in register the compression clip is in compression between one face of each groove and one face of the corresponding step and the angle between the compression forces acting on the clip and the longitudinal axis of the bore is in the range 30.degree.-70.degree..

Abstract: A member oscillates on a face and another member pivots on a bed of the first member. Passages are provided through the members to lead a lubrication fluid under pressure into a fluid pocket between the mentioned face and one of the members. The fluid pressure in the pocket carries a major portion of the load of one of the members on the face. The oscillation of the members has one stroke under higher load and one under less load. The pivotal movement of the other member controls the flow of fluid through the passages to provide high pressure in the fluid pocket at the stroke under higher load and lower pressure in the pocket at the stroke under less load. The arrangement is especially suitable to be provided on pistons and piston shoes of fluid handling machines. But it can also serve to carry load on other members of machines or vehicles, wherein at least two movements are taking place and a source of supply of fluid under pressure is available.

Abstract: Multi-cylinder in-line and radial pumps having an improved structure for coupling the piston heads to the crankshaft such that the number of parts commonly employed and the size of the resulting pump is greatly reduced when compared to prior art pumps now on the market. Both in-line piston pumps and radial diaphragm pumps are included. The connecting rods comprise plates, each having a bore through the thickness dimension thereof for receiving a cylindrical lobe formed eccentrically on the pump's crankshaft. Formed on one end of each of the connecting rods is a generally cylindrical bore, also extending through the thickness dimension of the connecting rod, the center of this bore being displaced inwardly of the end edge surface of the connecting rod by a distance which is less than the radius of the bore.

Abstract: A mud pump piston assembly is provided which facilitates replacement and secure holding of piston parts which wear rapidly. A hollow piston member which fits on the end of a piston rod to seal against the cylinder, is held in place by a thin pressure ring which is captured by a retainer ring lying in a groove around the piston rod. The piston member has a concave face and the thin pressure ring closely mates with the concave face to support it, while leaving most of the concave face of the piston member uncovered so it can be expanded by pressured mud to more completely seal against the cylinder. In one assembly, the retainer ring is formed with a circular cross section, and lies halfway within a groove of semicircular cross section while the pressure ring is formed of triangular shape and with one side of the triangle abutting the circular retainer ring at substantially the top of the groove.

Abstract: A hydraulic mast digger has a kelly head with improved retaining and sealing features. The digger is of the type having a kelly with a bearing assembly mounted between the kelly and a bearing sleeve. The bearing sleeve is reciprocally carried in the hydraulic cylinder and moves in response to hydraulic fluid pressure. The bearing assembly allows rotation of the kelly with respect to the bearing sleeve. A cap is secured by threads to the bearing sleeve above the top of the kelly to define a piston. The cap has an upwardly facing shoulder located below the upper edge of the bearing sleeve. A retainer is rigidly secured to the cap and extends down into the space between the cap and bearing sleeve. A locking device locks the retainer to the bearing sleeve. Preferably the locking device includes a key that fits within slots formed on the retainer and bearing sleeve. A primary seal encircles the retainer.

Abstract: An oil well subsurface pump comprising a housing having one end thereof adapted to be secured to the lowermost end of a sucker rod, or the like, and the opposite end thereof in open communication with the fluid reservoir in a well bore, a ball check valve carried by the housing, a ball stop member disposed within the housing for limiting the movement of the ball member in one direction and having ports therein for passage of fluid upwardly through the housing, resilient sealing assembly interposed between the outer periphery of the housing and the inner periphery of the barrel and slidable with respect to the barrel during a pumping operation, and discharge ports provided in the housing in spaced relation to the sealing assembly for directing well fluid from the interior of the housing to the annulus between the housing and the working barrel for transportation of the fluid to the surface of the well bore.

Abstract: A piston for use with a rotary piston rod or so-called rotary piston can be constructed so as to utilize a solid sleeve-like piston body of a material selected from the group consisting of structural carbon and graphite. This piston body is utilized around an elongated, tubular center member which has openings extending to the interior of the piston body for the purpose of conveying hydraulic fluid so as to lubricate the piston body to facilitate relative rotation of the piston body relative to the sleeve. Appropriate grooves holding elastomeric fluorocarbon sealing rings are located in the piston body and holding structures are provided for holding the piston on the sleeve. The piston is particularly adapted for use in machines for use for cleaning tubes and pipes.

Abstract: A fluid pressure actuated piston that consists of two parts, a metallic portion and a nonmetallic portion, is disposed in a conventional, metallic, cylindrical housing. The non-metallic portion is slidably engaged with the metallic housing. The metallic portion has a clearance to prevent contact with the metallic housing and is connected to the non-metallic portion in such a manner as to provide a recess for a conventional O-ring seal. The recess has metallic O-ring sealing surfaces on both the piston and the housing without any metallic contact to the housing.

Abstract: A piston ring having a general shape of a cylinder with the first section in the shape of an annulus for engaging a portion of the surface of a piston to provide a fluid-tight seal with the piston and a second section in the shape of a thin-walled bowl with sealing means on the outer surface of the bowl for providing a fluid-tight seal between the ring and the cylinder wall. The ring is especially constructed for use at cryogenic temperatures of -320.degree. F and below.

Abstract: A high pressure plunger and a method of making for use in piston-cylinder like apparatus which are used for the high pressure compression of gases up to, for example, approximately 40,000 p.s.i. A high pressure plunger of the present invention comprises a tubular member of hard wear resistant material whose opposing ends are abuttingly engaged by steel end caps with the steel end caps being interconnected internally of the tubular section with a tension member so as to hold the tubular member in compression.

Abstract: The pressure piston for a die-casting machine comprises a carrier formed with a crown having a central blind bore closed at its driving end and with an abutment ring. Surrounding the carrier and abutting the abutment ring is a piston skirt forming with the carrier an annular space through which passes a cooling medium. The skirt is held in position by a threaded clamping sleeve engaging a thread on the carrier on the side of the annular space remote from the abutment ring. By providing a thread of suitable length the carrier can accommodate skirts of various sizes. For this reason the axial extent of the carrier part between the abutment ring and the securing region for the clamping sleeve is less than the maximum but greater than the minimum length of the piston skirts.

Abstract: A bolt-on piston assembly wherein two piston pieces are clamped onto the rod which has an integral radial projection thereon for axially restricting the piston pieces disposed on axially opposite sides of the projection. A plurality of bolts extend into the pieces for releasably clamping the pieces relative to the radial projecting portion of the rod.

Abstract: A piston-cylinder assembly having a circumferential groove around the piston near the end of the piston facing the cylinder chamber, a cuff around the piston at a location more remote from said chamber from the groove, a guide ring mounted in the groove for slideably abutting the cylinder wall, the guide ring having a convex inner configuration and a generally cylindrical outer configuration.

Abstract: A mono-seal pump piston comprising a mono-seal assembly including a central seal-supporting hub having a plurality of annular support ribs and a pair of resilient seals oppositely disposed on either side of the supporting hub, the seals including an outer annular sealing lip for sealing engagement with an inner wall of a pump cylinder and an inner annular seaing lip for sealing engagement about the piston rod which passes therethrough. The pump piston is retained on the piston rod by a pair of mounting followers positioned on either side of the piston assembly and held thereon by a nut.