Abstract: A rotary shaft sealing assembly having a rotatable shaft, a seal housing having a groove bore located radially outward of and facing the rotatable shaft, and a sealing element in sealing contact with the shaft and groove bore. The sealing element having seal body first and second ends and tangs extending axially from the seal body first end. A shelf member has an outer groove wall and a shelf defining an inner groove wall. The inner and outer groove walls providing axial support to the sealing element in certain conditions of assembly and operation. The seal housing or the shelf member providing restraints, with a portion of the restraints in circumferential alignment with the tangs and blocking rotation of the sealing element. The shelf, located radially between the shaft and the restraints, blocks and prevents loss of the restraints.

Abstract: A sealing device capable of preventing, when a shaft and a housing move relative to each other, the sealing device from moving together with the shaft. A resin seal ring 100 includes a cylindrical section 110, a pair of inner circumference lips 120 respectively provided on both sides of the cylindrical section 110 in the axial direction, a pair of outer circumference lips 130 respectively provided on both sides of the cylindrical section 110 in the axial direction, and an annular mounting groove 111 which is provided on an outer circumference surface of the cylindrical section 110 and in which the elastic seal ring 300 is mounted. The pair of inner circumference lips 120 are configured to slide on an outer circumference surface of the shaft. The pair of outer circumference lips 130 are configured to be in close contact with the inner circumference surface of the shaft hole.

Abstract: A piston rod assembly for a reciprocating compressor. The piston rod assembly may include a piston rod having a longitudinal axis and forming a piston rod neck and a piston rod shoulder. The piston rod may include a first end integral or coupled with a piston head and a second end axially opposing the first end and configured to couple with a crosshead including a flange. An inner surface of the flange may have a Brinell hardness. The piston rod assembly may also include a cylindrical sleeve disposed circumferentially about the piston rod neck. The cylindrical sleeve may have a lower Brinell hardness than the Brinell hardness of the inner surface of the flange.

Abstract: An annular seal cavity throat bushing includes an inner annular surface having a substantially latitudinal channel with the channel being provided with at least one orifice to allow fluid communication between the inside of the bushing and the outside of the bushing. The bushing is further provided with at least one groove extending substantially longitudinally from one end of the bushing to the channel. The groove has at least one tapered edge which increases the width of the groove along its length.

Abstract: A second piece nests within a first piece and has a circumferential groove. A vent penetrates the first piece and matches the circumferential groove when the second piece is nested within the first piece. An o-ring is modified to allow equal pressure on either side of the o-ring.

Abstract: A debris wiping device (15) for a piston rod-cylinder assembly (10) includes a wiper ring (16), which surrounds a central opening (19). The wiper ring (16) includes a flexible element (17) that surrounds the central opening (19). A retaining cap (21) includes a tubular segment (22, 23) that transitions at one end into an end wall (24), which has a through opening (25).

Abstract: A sealing device (100) includes a resinous sealing ring (110) and an elastomeric elastic ring (120) in an annular groove 210. The sealing ring (110) has a cylindrical surface portion (112a) making intimate contact with a groove bottom of the annular groove (210) and an inclined surface portion (112b) expanding in diameter toward the atmosphere side (A). The elastic ring (120) is disposed such that at least its portion is compressed between the inclined surface portion (112b) and the groove bottom of the annular groove (210) so as to press a portion of the sealing ring (110) on the atmosphere side (A) toward the outer peripheral side.

Abstract: A seal-bearing assembly to be inserted into the seal cavity of a mechanical device to provide a seal and a bearing surface to eliminate whip in a rotating and/or reciprocal cylindrical member. The seal-bearing assembly is particularly well suited for use in a reciprocal pump or a piston-driven valve, or between the steam lance and fixed steam tube in a sootblower. The assembly includes at least a pair of outer substantially rigid cylindrical bearings having an inner bore to be positioned over the cylindrical member and at least one complimentary flexible textile packing ring substantially comprised of carbon disposed between the two outer bearing members. In assemblies including an additional bearing, the additional bearing is surrounded by at least one flexible packing on each side. The inner bore of the bearing members provides a bearing surface for eliminating whip of the moving elements in the device.

Abstract: A bearing bushing assembly for a telescopic steering shaft comprises an outer tube and an inner tube, wherein the bearing bushing assembly comprises a bearing bushing, which is seated against the inner tube and made of an inflexible plastic material, and a sealing element, which is molded onto the bearing bushing and made of an elastic plastic material so as to connect the inner tube to the outer tube in an axially movable and sealing manner, the bearing bushing being enclosed by an elastic bushing, which in turn is enclosed by an end section of the outer tube, the outer circumference of the elastic bushing comprising outwardly extending rib-shaped elements, the elastic bushing comprises at least one sealing lip extending in the axial direction.

Abstract: A seal-bearing assembly to be inserted into the seal cavity of a mechanical device to provide a seal and a bearing surface to eliminate whip in a rotating and/or reciprocal cylindrical member. The seal-bearing assembly is particularly well suited for use in a reciprocal pump and between the steam lance and fixed steam tube in a sootblower. The assembly includes at least a pair of outer substantially rigid cylindrical bearings having an inner bore to be positioned over the cylindrical member and at least one complimentary flexible textile packing ring disposed between the two outer bearing members. In assemblies including an additional bearing, it is surrounded by at least one flexible packing on each side. The inner bore of the bearing members provide a bearing surface for eliminating whip of the moving elements in the device.

Abstract: A linear guide apparatus includes a set of two side seals disposed at each of both ends in the direction in which a slider moves. An inner seal disposed at the slider side and an outer seal are individually attached to the slider by bolts and, respectively. Accordingly, the two side seals can be attached easily and highly precisely to the slider.

Abstract: A guiding and sealing unit for a rod of a shock absorber, including a bushing, and a sealing assembly pressed into a cup-shaped seat on one end of the bushing facing the inside of the shock absorber body. The sealing assembly includes a sealing ring and an annular sealing lip that contacts the rod, a metallic reinforcing structure having a flange-shaped portion that abuts the end of the bushing and a sleeve-shaped portion. A reinforcing ring snappingly mounted on the sealing ring on a side opposite to the lip, engaged on the rod, and made of a low friction coefficient material that is more rigid than the material used to form the sealing ring and which axially extends in the seat flanking at least in part, the sleeve-like portion of the reinforcing structure.

Abstract: A bearing bushing assembly for a telescopic steering shaft comprises an outer tube and an inner tube, wherein the bearing bushing assembly comprises a bearing bushing, which is seated against the inner tube and made of an inflexible plastic material, and a sealing element, which is molded onto the bearing bushing and made of an elastic plastic material so as to connect the inner tube to the outer tube in an axially movable and sealing manner, the bearing bushing being enclosed by an elastic bushing, which in turn is enclosed by an end section of the outer tube, the outer circumference of the elastic bushing comprising outwardly extending rib-shaped elements, the elastic bushing comprises at least one sealing lip extending in the axial direction.

Abstract: A lance tube stuffing box assembly includes within a seal cavity, a first and a second sleeve bearing oriented to be axially aligned with the bore and with each other and spaced apart within the bore to define a packings space. A plurality of braided packings are situated within the packings space and oriented to be axially aligned with each of the first and second sleeve bearings; and inserted within the bore in opposed relation to the annular wall of the seal cavity a gland follower which is likewise axially aligned and bears against the first bearing with an axial force to narrow the packings space, urging the plurality of braided packings to expand radially, such that when a lance tube is inserted axially. The axial force causes the braided packings to sealingly engage the lance tube.

Abstract: A guiding and sealing unit for a rod of a shock absorber, including a bushing, and a sealing assembly pressed into a cup-shaped seat on one end of the bushing facing the inside of the shock absorber body. The sealing assembly includes a sealing ring and an annular sealing lip that contacts the rod, a metallic reinforcing structure having a flange-shaped portion that abuts the end of the bushing and a sleeve-shaped portion. A reinforcing ring snappingly mounted on the sealing ring on a side opposite to the lip, engaged on the rod, and made of a low friction coefficient material that is more rigid than the material used to form the sealing ring and which axially extends in the seat flanking at least in part, the sleeve-like portion of the reinforcing structure.

Abstract: A bushing adapted to secure an O-ring seal in position relative to an area of a passage permitting reciprocation of a push rod forms a generally circular bushing body with opposed end faces. The end faces are separated by a gap so as to provide the bushing with an approximately C-shaped structure. The bushing includes a plurality of locking elements resistant to axial loads imposed on the bushing by the push rod disposed at least substantially within a corresponding plurality of recesses distributed around a circumferential exterior of the bushing. Solid ribs are interspersed with the locking fingers to resist radial loads imposed on the bushing by the push rod during operation. The O-ring seal is secured in position within the passage area of the passage by an end surface of the bushing.

Abstract: A lubricated guide unit is for a motorcycle fork tube that includes an outer tube and an inner tube telescopically slidable within the outer tube. The guide unit includes upper and lower sliding bushings axially spaced apart and disposed within a cavity of the outer tube and guide sliding movement of the inner tube. A first sealing device is mounted at an open end of the outer tube and seals against the outer surface of the inner tube. A second sealing device is mounted in the outer tube and seals against the outer surface of the inner tube. The second sealing device is axially spaced from the first sealing device such that a sealed, lubrication chamber is defined between the two sealing devices and the facing circumferential surfaces of the inner and outer tubes, the two bushings being disposed within the chamber.

Abstract: An improved rod wiper for excluding dirt and other environmental materials from a linear actuator is described. The annular wiper element includes an outwardly extended lip that is in constant engagement with the front face of the actuator housing. Not only does the lip assist in creating a seal with the housing, it redirects axial forces to have a radial component on the inwardly extended lips of the wiper element in contact with the rod to improve the seal of the wiper element and rod.

Abstract: The present invention provides a seal device comprising a sealing passage which allows communication between a first space and a second space, and evacuation lines individually connected to the first space and the sealing passage. A gas feed line for feeding dry gas is connected to the sealing passage.

Abstract: Wet cup throat seal (3) and bearing (2) combination is designed for use in a reciprocating piston pump where in the wet cup (1) is designed to hold the seal assembly thereby insuring proper displacement rod (5) alignment and maximizing seal life. The construction also allows for easy and inexpensive replacement and allows piston seals (6) and throat seals (3) to be interchangeable.

Abstract: In a sliding structure in which a shaft member is retained slidably in a guide hole, the lack of an oil film caused by the edge contact of the shaft member to which a pressing load in the axial direction is applied is prevented. With the fact being taken into account that end portions 25c1 and 25c2, which are always in slidable contact with a side surface 1232a of a guide hole 1232, of a side surface 25c of a shaft member 251 are the partial edge portion, a plurality of labyrinth grooves 2501 and 2502 are formed in the end portions 25c1 and 25c2, respectively, thereby it is possible for an oil film to cover the entire contact portion without increasing the groove width extremely. Because the groove width is not increased extremely, the length of the sliding portions can be ensured.

Abstract: A holder driving device has: a holder holding a substrate, a shaft supporting the holder, a driver for driving the shaft reciprocatingly and linearly in the direction along the shaft, a bearing unit having mechanical linear motion bearings for supporting the shaft thereon and having one or more stages of exhaust chambers surrounding the shaft; a vacuum pump for vacuum-pumping the exhaust chambers of the bearing unit; and a gas replacement mechanism for supplying dry gas, the humidity of which is lower than that of at least the surrounding atmosphere and the pressure of which is positive, from the outside of the bearing unit to at least the neighborhood of an atmosphere-side entrance portion of a gap between an end portion of the bearing unit one the side opposite to the vacuum vessel and the shaft passing the end portion, so as to replace the atmosphere near the entrance portion by the dry gas.

Abstract: A MacPherson strut tube having an upper spring seat, a spring, a strut tube, and a ring bearing disposed for engaging the spring seat, the spring and the strut tube. The ring bearing comprises an upper casing, a lower casing, and a plastic ring engaged between the upper and lower casings, thereby forming said ring bearing.

Abstract: A fluid power assisted rack and pinion steering apparatus (10) for a vehicle includes a rack (40) connectable with steerable wheels of the vehicle, a housing (20) partially enclosing the rack (40) and defining a fluid chamber (39), a bushing (390 or 590) encircling the rack (40), a sleeve (420 or 620) supporting the rack (40) for sliding movement relative to the bushing (390 or 590), and a fluid tight seal member (370 or 570) for sealing the fluid chamber (39). The bushing (390 or 590) has opposite axial ends (391, 412 or 591, 612) and is secured in the housing (20) by an interference fit between an outer surface 394 or 594) of the bushing (390 or 590) and an inner surface (26) of the housing (20). The sleeve (420 or 620) extends between the bushing (390 or 590) and the rack (40). The sleeve (420 or 620) has at least one radially extending tab (431 or 631) received in a corresponding recess (418 or 618) in the bushing (390 or 590).

Abstract: A guide to support a shaft such as a pump pull rod (11) which is capable of both rotary and reciprocal motion. The guide prevents any misalignment of rod (11) damaging a seal, e.g. a stuffing box, held in space (24). Guide element (18) has central portion (19) and annular flange (25). Element (18) can move laterally with respect to housing (12) and can also pivot, along with the cap (15) of the housing (12), with respect to the lower portion (14) thereof. The latter is achieved via movements of part-spherical bearing element (28) and similarly shaped faces (26, 37, 38) of housing 9120. Further seals (33, 34) prevents entry of pumped fluid into chamber (13).

Abstract: A fluid power assisted rack and pinion steering apparatus (10) for a vehicle includes a rack (40) connectable with steerable wheels of the vehicle, a housing (20) partially enclosing the rack (40) and defining a fluid chamber (39), a bushing (90) encircling the rack (40), a sleeve (110) supporting the rack (40) for sliding movement relative to the bushing (90), and a fluid tight seal member (70) for sealing the fluid chamber (39). The bushing (90) has opposite axial ends and is secured in the housing (20) by an interference fit between an outer surface (94) of the bushing (90) and an inner surface (26) of the housing (20). The sleeve (110) is press fit against a first recessed surface (92) in the bushing (90) of a first diameter. The sleeve (110) thereby extends between the bushing (90) and the rack (40) and engages the rack (40). The seal member (70) is located adjacent a. second recessed surface (103) in one axial end of the bushing (90).

Abstract: A fluid power assisted rack and pinion steering apparatus (10) includes a rack (24) connectable with steerable wheels of the vehicle. The rack (24) is movable in opposite directions to turn the steerable wheels in opposite directions. A housing (20) partially encloses the rack (24) and defines a fluid chamber (40). The housing (20) has an inner surface (30). A bushing (60) encircles the rack (24) and supports the rack for sliding movement relative to the housing (20). The bushing (60) has a recess (70) on its outer periphery. A portion (79) of the housing (20) is deformed radially inward into the recess (70) to secure the bushing (60) to the housing (20). An annular first seal member (90) encircles the rack (24) and extends between the rack and the bushing (60). An annular second seal member (100) encircles the bushing (60) and extends between the bushing and the inner surface (30) of the housing (20). A bellows member (120) encircles the rack (24) and has an end portion (126) secured to the bushing (60).

Abstract: A vehicle steering apparatus (10) comprises a rack (24) connectable with steerable vehicle wheels and a housing (20) partially enclosing the rack and defining a fluid chamber (50). The housing (20) includes an inner surface (30) and a radially extending end surface (36). An annular seal member (72) seals the fluid chamber (50). The seal member (72) encircles the rack (24) and extends between the rack and the inner surface (30). A bushing (70) encircles the rack (24) and is attachable to the housing (20). The bushing (70) includes a first portion (80) disposed between the rack (24) and the housing (20). The first portion (80) supports the seal member (72) and supports the rack (24) for sliding movement relative to the housing (20). The bushing (70) includes a second portion (82) having a first section (130) disposed between the rack (24) and the housing (20). The second portion (82) has a second section (132) extending beyond the end surface (36).

Abstract: The present invention relates to a linear movement device, for example, a linear guide device, a ball screw, a ball spline or the like in which a track shaft and a slide member is engaged movably relative to each other via a rolling element of a ball, a roller or the like, in details, to an improvement of a linear movement device having a lubricant supplying member coating a lubricant on a face of the track shaft.

Abstract: A linear motion guide unit comprises a round track shaft and a slider surrounding around the track shaft for sliding movement along the track shaft. A lubricating plate assembly for self-lubrication may be simply installed in most prior linear motion guide units, with no need of modification in the basic specification of a slider. Both the lubricating plate assembly and the slider are held by a retaining ring in a radially enlarged bore in the housing of the instrument in such a manner as to be kept from falling off the bore. The lubricating plate assembly includes a case accommodating therein an end seal and a lubricant plate, which is composed of a lubricant- containing member, made of a sintered resinous component having a porous structure impregnated with lubricant. As the slider moves along the track shaft, the lubricant-containing member may apply incessantly the lubricant to the track shaft.

Abstract: A bearing bush (1) having a groove (7) which has a curved contour and is located inside an annular bead (2) projecting outwards with respect to the bush body (6). A sealing member in the form of an o-ring (4) may be inserted into the groove (7). The bead for accommodating the sealing member is produced by an upsetting process.

Abstract: A hydrostatic bearing assembly and fluid return system is provided for collecting and returning hydrostatic fluid which exits the bearing assembly to a remote location. The bearing assembly and fluid return system includes a hydrostatic bearing which is connected to supply and return reservoirs by supply and return hoses or conduits, respectively. The bearing assembly includes a carriage having a bushing secured within the carriage between a pair of retaining rings. A collection cylinder is fixedly positioned between each retaining ring and one end of the bushing. Each collection cylinder defines a collection chamber adjacent one end of the carriage, which is positioned to receive hydrostatic fluid exiting a gap defined between the carriage and a support rail. The return hoses or conduits each have a first end that communicates with one of the collection chambers and a second end that communicates with remotely located reservoir.

Abstract: A valve stem sealing device used for preventing oil from entering a combustion chamber through a gap formed between a valve guide and a valve stem is disclosed. The valve stem sealing device comprises an annular oil seal surrounding a valve stem and an annular support member fixed to the top of the valve guide so as to hold the oil seal in its place, wherein the support member has an inwardly opening annular recess and rotatably receives the oil seal in the recess, with a bearing being positioned between said oil seal and the side wall of the support member. In addition, a rubber member is tightly interposed between the support member and the valve guide so as to absorb the vibrations caused by a valve operation. Also, a support cap covers the outside wall of the oil seal so that the outside wall of the support cap is brought into contact with the bearing.

Abstract: An actuating slide assembly for an automatic assembly machine, wherein the slide assembly includes telescoping fluid conducting conduits interconnected between the slide body and associated end block mounted for relative reciprocal movement relative to the slide body and a sealing arrangement for effecting a fluid tight seal between the relative movable telescoping conduits and associated slide body and end block. The sealing arrangement includes a sealing cartridge and associated O rings circumscribing one of the telescoping fluid conduits intermediate the opposed ends thereof to prohibit any leakage between the relative movable telescoping conduits and the associated slide body and a second sealing arrangement connecting the outer end of a telescoping conduit to its associated end block in a manner to provide a leakproof seal therebetween.

Abstract: A linear motion rolling bearing which, together with enabling lubricant to be supplied inexpensively and reliably, allows maintenance relating to the occurrence of lubricant clogging and so forth to be performed easily, while also enabling the supply of lubricant to be performed extremely simply even in the case of small products. Lubricant insertion holes are formed in end seals provided on the ends of an outer cylinder, and a lubricant such as grease is injected through the lubricant injection holes using an injector.

Abstract: A new ball circulating system for a linear ball bearing that greatly simplifies the manufacturing process of the ball bearing. The linear ball bearing includes an outer sleeve, a ball retainer, several ball tracks and two snap rings. Each ball track includes a linear loaded ball groove and a linear unloaded ball groove, and two semi-circular ball turning grooves which allow the steel balls to turn 180 degrees between the two linear ball grooves. The turning grooves include two-stage depth variations to simplify the geometry of the inner surface of the outer sleeve, to provide better manufacturability, and to increase the bearing's overall strength and longevity.

Abstract: A linear bearing structure comprises a bearing bush, a plurality of annular ball retainers each holding a plurality of bearing balls, circumferentially and a pair of annular endpieces respectively removably secured to ends of the bush to confine the ball retainers therein. The bearing bush comprises an outer metal cylinder and an inner cylindrical lining layer formed by a bearing material having a small coefficient of friction and a small coefficient of wear and is provided with a slit which has a predetermined width and extends along the axis of the bush over the entire length thereof so that the bush can be circumferentially elastically compressed by a magnitude corresponding to the width of the slit. Each of the endpieces has, at the inner side thereof, an annular groove having a diameter smaller than that of the bush so that by compressing the bush into the annular grooves of the endpieces at the ends of the bush, the bush and the endpieces can be elastically fitted together.

Abstract: This invention relates to a support assembly which is to be used in association with a sealing arrangement to support a member which is movable with respect to a base element.

Abstract: A wear ring constructed for use with a pneumatic tube system carrier of a type having two spaced apart wear rings positioned near the axial ends of the carrier. The wear ring is comprised of a rigid, yet flexible, annular support member having an outer cylindrical surface. A layer of woven fabric selected from the group consisting of cotton, wool, or felt is bonded to the cylindrical surface of the support member. The fabric material preferably has a coefficient of friction with the interior transfer tube not greater than 0.35.

Abstract: A device is provided for clearing iron chips produced during a mechanical working process and includes a plurality of telescopic housings. A fastening member is securely attached to an underside of an upper plate of the telescopic housing and has a first side wall member and a second side wall member. A first socket is defined through an underside of the first side wall member and a second socket is defined through an underside of the second side wall member. A resilient member is securely attached to the fastening member and includes a first locking element which is formed on the first side of the resilient member and is securely received in the first socket. A first protrusion portion formed on an underside of the first locking element has a first clearing edge portion extending outwardly therefrom. A second locking element formed on the second side of the resilient member is securely received in the second socket.

Abstract: A device is provided for clearing iron chips produced during a mechanical working process and includes a plurality of telescopic housings. A fastening member is securely attached to the underside of an upper plate of the telescopic housing. A recess having a substantially T-shaped cross-section is defined in an underside of the fastening member. A groove having an arc-shaped cross-section is defined in the underside of a first side wall member of the fastening member. A first flange portion is laterally formed on a second side wall member of the fastening member and extends outwardly therefrom. A resilient member is securely attached to the fastening member and includes a locking element having a substantially Y-shaped cross-section securely received in the substantially T-shaped recess. A lug portion having an arc-shaped cross-section is formed on a first side of the resilient member and is partially enclosed in the arc-shaped groove.

Abstract: The invention relates to a guide-tube with integral sealing for motor vehicle gearbox clutch release bearing, comprising a tubular sleeve able to be engaged axially around the input shaft of the gearbox and having a radial bearing surface made from one part, forming a plate for fixing the guide-tube to the outer face of the wall of the casing of the gearbox, and a sealing ring with a lip engaged inside the sleeve.The sealing ring with a lip comprises a reinforcing member (5) comprising a tubular bearing surface (6) able to be engaged by force in the tubular sleeve (1) of the guide-tube, the said tubular bearing surface (6) being extended at each of its ends by a radial bearing surface, one (7) directed towards the inside and at the end of which a sealing gasket with a lip (9) is made and the other (8) directed towards the outside and on which an annular sealing bead (13) is made, able to come into contact with the external face of the wall of the casing.

Abstract: A sleeve which may be used to align a reciprocable member with operations performed in structurally discrete abutting members. The sleeve has coaxial axially extending diametral portions each having different diameters. The juncture of the diametral portions forms an annular face which abuts the outer face of one member when a first diametral portion of the sleeve is placed in a respectively sized bore formed therein. The second abutting member may then be aligned with the first member by locating the respective structure such that a bore formed in the second member receives the second diametral portion of the sleeve. A bore formed in the sleeve may be used to slidingly support a first translatable member. In this manner the respective positions of the abutting structures are established and respectively aligned with a translatable member interacting therebetween.

Abstract: A bushing and a seal member are disposed within a tubular housing partially defining the fluid chamber of a fluid power rack and pinion vehicle steering gear. The steering gear rack is axially movable within the chamber and extends axially through the seal and the bushing. The bushing supports the rack for axial movement in the tubular housing. The inner seal surface of the seal member sealingly engages the rack. The outer seal surface of the seal member sealingly engages the cylinder wall. The seal member and the retaining ridge have interdigitated portions which are urged into interlocking engagement by the cylinder wall.

Abstract: An exhaust gas recirculation valve assembly for controlling the recirculation of exhaust gas in an internal combustion engine having a base with an exhaust gas chamber formed therein, a valve assembly having a valve member mounted within the exhaust gas chamber for metering the flow of exhaust gas therethrough, and a valve stem extending out of the chamber through an opening therein, a one piece bearing having upper, intermediate, and lower bearing members for precise positioning of the valve member within the exhaust gas chamber, and a valve stem support assembly for mounting the valve stem relative to an actuator. The intermediate and upper bearing portions operate to deflect exhaust gas, escaping from the exhaust gas chamber and traveling along the valve stem of the valve member, from impinging on the actuator.

Abstract: The invention contemplates use of a suction bell to enhance the loading with which a guided machine part is gravitationally supported on its guide. In application to a machine in which the machine part is movably supported on air bearings, the suction bell applies a preload force of magnitude to optimize the stiffness of air-bearing action and to maintain an air gap of uniform capillary thickness, free of mechanical contact between the machine part and its supporting surface.

Abstract: A seal assembly for use in establishing a seal between the pump rod of a down the hole pump and the upper end of a bore casing. The seal assembly having a stuffing box supported by a body through which the pump rod extends. The stuffing box being mounted on a guide member having a ball section with the pump rod extending axially therethrough. The ball section being seated in bearings located in a chamber in the body so that the guide member and stuffing box may pivot relative to the body to accommodate angle misalignment of the pump rod. The bearings having freedom for lateral movement in the body chamber to establish axial alignment of the stuffing box with the pump rod.

Abstract: A compressed gas and a liquid are contained in a cylinder. A liquid chamber containing the liquid and a gas chamber containing the gas are divided by a metallic bellows. The liquid chamber is situated on the side of an open end of the cylinder. A rod is inserted in the cylinder. A sealing assembly is provided at the open end of the cylinder. The sealing assembly has a bearing member at only one portion of the cylinder with respect to the axial direction thereof. A space extends throughout the circumference between the outer peripheral surface of the inner end of the rod and the inner peripheral surface of the cylinder. A seal device for sealing the liquid in the liquid chamber includes a seal ring intimately in contact with the outer peripheral surface of the rod and an elastomer ring provided on the outer peripheral surface side of the seal ring and capable of elastic deformation in the radial direction of the rod. The rod can swing within the range of an angle .theta.

Abstract: The invention relates to a scraper construction for telescopic steel covers comprising a metal carrier strip and an elastic scraper body. The cross-sectional configurations of the scraper body and the carrier strip are such that the latter is accommodated in a groove of the scraper body and the latter has retaining limbs that may be clamped between the carrier and a cover on which the carrier is secured.

Abstract: A device for supporting an overhang type slidable pinion shaft of an electric motor for starting an engine comprises a bearing for supporting the pinion shaft, the bearing including an inner ring having a groove provided in its inner peripheral surface. Accordingly, it is possible to secure grease or oil in the groove provided in the inner peripheral surface of the inner ring of the bearing and it is therefore possible to minimize the boundary friction occurring between the inner peripheral surface of the inner ring of the bearing and the sliding surface of the pinion shaft and, at the same time, enable the pinion shaft to slide even more smoothly.