Patents Examined by Robert S. Ward
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Patent number: 4749202Abstract: A sealing and guide unit for pistons comprising an energized elastic ring placed into a corresponding cavity or groove and a rigid antifriction ring fitted on said elastic ring and projecting at both its sides to cover the extended borders of said cavity or groove. The section of said-rigid ring being very small the radial thrust of said energized elastic ring produces a curvature in the direction of its cross section so that only the central portion of the ring will adhere with a limited friction to the inner surface of the piston chamber, while the lateral portions of the ring are supporting the lubricating effect.Type: GrantFiled: April 18, 1983Date of Patent: June 7, 1988Inventor: Agostino Bonomi
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Patent number: 4749199Abstract: A shaft seal assembly having an annular member affixed to the shaft for rotation therewith, a sleeve encompassing the shaft and being biased axially towards the annular member and a free floating sealing ring interposed between the annular member and the sleeve to prevent pressurized working substance form leaking about the shaft is disclosed. The sealing ring includes internal flow passageways which act to reduce the pressure of lubricant flowing therethrough to both effectively cool the free floating ring and to reduce the pressure of the lubricant obviating the necessity of a separate breakdown bushing.Type: GrantFiled: December 22, 1983Date of Patent: June 7, 1988Assignee: Elliott Turbomachinery Co., Inc.Inventor: Michael T. Gresh
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Patent number: 4749200Abstract: A rotary mechanical seal with metal bellows having reinforced weld joints. The bellows is formed of a plurality of adjacent annular discs or diaphragms having inner and outer circumferences welded together. A plurality of annular reinforcing rings are provided, each being associated with the welded joint at one circumference of the diaphragms. The associated rings and the circumferences define a weld area. The presence of the reinforcing rings allows for larger and stronger welds along the associated circumferences, which increases the capacity of the seal to withstand operating pressures.Type: GrantFiled: May 19, 1986Date of Patent: June 7, 1988Assignee: John Crane-Houdaille, Inc.Inventors: Joseph Sehnal, Leonard B. Mednick
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Patent number: 4747604Abstract: A rotary shaft seal for the rotary cutter of a each boring drill bit includes a fixed seal ring fitted securely in the cutter and having an end face which includes a first tapered surface, a floating seal ring having an end face, which includes a second tapered surface opposing the first tapered surface, and a curved inner circumferential surface, and a resilient O-ring compressed between the curved inner circumferential surface of the floating ring and a bearing portion on which the cutter is rotatably journalled.Type: GrantFiled: September 18, 1986Date of Patent: May 31, 1988Assignee: Tsukamoto Seiki Co., Ltd.Inventor: Osamu Nakamura
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Patent number: 4747603Abstract: An oil seal of the type having a metallic reinforcement rig whose outer peripheral portion is oil-tightly fitted into a housing, characterized in that after the formation of fabrication of said metallic reinforcement ring, the latter is subjected to a nitriding hardening process so that its durability of a raw material of said metallic reinforcement ring; and a seal lip of formed over the inner peripheral edge portion of an annular flange portion of said metallic reinforcement ring.Type: GrantFiled: November 18, 1986Date of Patent: May 31, 1988Assignee: Arai Seisakusho Co., Ltd.Inventors: Eiichi Sugino, Eigoro Tsukagoshi, Yoshio Arai
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Patent number: 4747601Abstract: In order to permanently ensure the confinement of two closed volumes with respect to the outside atmosphere, while permitting the linking of said volumes, use is made of two gaskets, each having in section an approximately circular and generally hollow part, as well as a part forming a member. One of the gaskets is mounted by its member in a groove formed in a door received in a flange of the volume, whereas the member of the other gasket is fixed in a groove formed in a flange in which is received a door of the other volume. During engagement, the circular parts of the gaskets are in tight contact with one another and on V-shaped inclined surfaces formed within the flange and on the periphery of the door.Type: GrantFiled: May 14, 1987Date of Patent: May 31, 1988Assignee: Societe Nouvelle d'exploitation de la CalheneInventor: Charles Glachet
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Patent number: 4747602Abstract: A sealing ring assembly comprises a synthetic resin sealing ring body having two opposing stepped cut surface portions including respective planer portions in sliding contact with each other, a synthetic resin gas sealing ring in contact with the inner circumferential surface of the sealing ring body, and a metal ring in contact with the inner circumferential surface of the gas sealing ring. To prevent the stepped cut surface portions from sticking to each other at the planar portions thereof, a metal film layer is provided on a planar portion of one of the stepped cut surface portions.Type: GrantFiled: June 10, 1987Date of Patent: May 31, 1988Assignees: Kabushiki Kaisha Riken, Aisin Seiki Kabushiki KaishaInventors: Daisaku Kobayashi, Tunesaku Itara, Koichiro Kasahara, Yutaka Momose, Tomokimi Mizuno
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Patent number: 4746127Abstract: A clamping band for clamping a resilient gasket against an opening within a wall to provide a fluid-tight seal therebetween. The clamping band is generally circular-shaped and has an elongated slot extending inwardly from one free end of the clamping band and cooperates with an elongated projection of reduced cross section as compared with the nominal cross section of the clamping band and which is provided at the opposite end of the band. The projection is inserted into the slot, the clamping band is placed against the gasket arranged within the aforesaid opening and the gasket is expanded a predetermined amount by an hydraulic expander to exert the desired clamping pressure upon the resilient gasket. One surface of the projection is provided with a series of teeth. An opening communicating with said slot receives a wedge fitted into said opening and having several teeth along one surface thereof, which teeth conform to the teeth of said projection.Type: GrantFiled: August 20, 1987Date of Patent: May 24, 1988Assignee: A-Lok Products, Inc.Inventors: James Westhoff, James A. Kelly
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Patent number: 4746023Abstract: A puncturable seal assembly is formed with a tubular shell adapted to be retained in an aperture in a housing of a vehicle engine. A generally radially inwardly extending flange is formed at one end of the tubular shell to define an opening which is closed by a sealing membrane. The sealing membrane has a generally circular center section attached to an annular rim portion which is molded about and bonded to the flange. A plurality of grooves are formed in a surface of the central portion whereby when pressure is applied to the membrane, the grooves rupture before any other portion of the membrane thereby permitting insertion of an oil line tube into the aperture in the housing of a vehicle engine.Type: GrantFiled: July 29, 1987Date of Patent: May 24, 1988Assignee: Dana CorporationInventor: Jerome G. Belter
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Patent number: 4746128Abstract: A cassette shaft seal in which the outer ring (3) and the inner ring (11) have an opposite angular profile and together enclose an annular space (5) of substantially rectangular cross section. This annular space is bounded by an outwardly projecting flange (8) of the inner ring (11), which revolves together with the shaft that is to be sealed. The gap remaining between the flange (8) and the outside ring (3) is expanded in cross section by segmental cutouts uniformly distributed around the circumference, through which, under normal operating conditions, the volume of liquid contained in the annular space (5) is constantly renewed.Type: GrantFiled: June 11, 1987Date of Patent: May 24, 1988Assignee: Firma Carl FreudenbergInventor: Gerhard Freiwald
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Patent number: 4746129Abstract: An expansion joint strip seal for use in roadways, bridges, buildings and the like to seal across a gap defined by a pair of parallel, elongated edge or frame members, which have generally C-shaped cavities opening towards the gap for purposes of supporting opposite lengthwise extending edges of the strip seal. The strip seal is formed of a suitable resiliently deformable material and defined by a web portion sized to span the gap and a pair of mounting bead portions joined to opposite edges of the web portion and adapted for insertion within the cavities of the edge members. Each mounting bead portion includes a solid or non-apertured main mounting portion, which is joined to the web portion and provided with a height essentially corresponding to the height of the cavity and a width less than the width of the cavity; and a tongue portion cantilever supported by the main mounting portion to project in a direction away from the web portion.Type: GrantFiled: September 14, 1987Date of Patent: May 24, 1988Inventor: Guy S. Puccio
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Patent number: 4746130Abstract: A flat gasket-type seal for placement between machine parts, especially hydraulic control panels. The seal has a metal plate against which the parts that are to be sealed are pressed. At least one elastomeric sealing ring is provided, each of which is mounted in a hole of the metal plate. To achieve a one-piece component, and for precise positioning of the sealing ring, the outer periphery of the sealing ring is secured to the peripheral surface of a hole of the metal plate via a vulcanization bond.Type: GrantFiled: January 15, 1986Date of Patent: May 24, 1988Assignee: KSA Dichtsysteme GmbH & Co. KGInventor: Berthold W. Abele
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Patent number: 4744572Abstract: A sealing mechanism capable of use in a valve subject to extended temperatures and pressures. The sealing mechanism comprises a seal ring positioned within a groove circumferential with respect to the passageway of the valve. A convex seating portion of the seal ring extends through an annular opening in the groove, for sealing engagement with a closure member. Shoulder portions, which extend from the sides of the seating portion, abut the sidewalls of the groove. The seal ring is compressed in width within the groove, so that a resilient side-sealing force is imparted to the contact of the shoulder portions with the sidewalls of the groove. Substantially leak proof sealing is achieved, which is maintained even in the event of high temperature conditions or fire.Type: GrantFiled: July 14, 1987Date of Patent: May 17, 1988Assignee: Posi-Seal International, Inc.Inventors: Bahman Sahba, Harry C. Champlin, Jr., John M. Cory
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Patent number: 4744570Abstract: A sealing profile includes a basic body being formed of elastomeric material and having a U-shaped cross section defining an inner surface thereof with sides. A metallic reinforcement inlay is disposed in the basic body. Sealing lips are integrally formed on the inner surface of the basic body. At least one of the sealing lips on one of the sides of the inner surface of the basic body is formed of the same material as the basic body. The at least one sealing lip has a substantially triangular cross section defining corners and an enlarged head surface. One of the corners pivotally connects the at least one sealing lip to the basic body. The enlarged head surface of the sealing lip has a concavely curved recess formed therein.Type: GrantFiled: August 4, 1987Date of Patent: May 17, 1988Assignee: Metzeler Kautschuk GmbHInventor: Jurgen Kranz
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Patent number: 4744569Abstract: A bellows type mechanical seal assembly in which the bellows is provided with inactive or non-functional diaphragms to increase the pressure capacity of the seal assembly.Type: GrantFiled: October 13, 1987Date of Patent: May 17, 1988Assignee: BW/IP International, Inc.Inventors: Robert S. Wentworth, Jr., deceased, by Benning Wentworth, executor
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Patent number: 4744571Abstract: A self-compensating seal having a substantially torodially shaped seal body and a plurality of axially separated annular wipers extending radially inwardly from the inner rim of the seal body in parallel arrangement. When a shaft or rod having a diameter greater than the inside diameter of the seal opening is inserted through the central seal opening, the wipers are bent or collapsed so as to extend in an axial direction. Each of the wipers is radially inwardly biased so that wear at the sealing surfaces of the wipers caused by shaft movement is compensated for automatically.Type: GrantFiled: July 8, 1986Date of Patent: May 17, 1988Inventor: John D. Geberth, Jr.
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Patent number: 4743034Abstract: A sealing device employing interfitting relatively rotatable rings, namely a stator and a rotor disposed for cooperation between a housing and a rotatable shaft. The stator is nonrotatably and sealingly engaged within an opening formed in the housing. An elastomeric O-ring maintains a seal between the stator and housing. The rotor snugly surrounds and is nonrotatably carried with the shaft and is provided with elastomeric seal ring therebetween to prevent leakage along the shaft. The stator closely externally surrounds the rotor to define a complex pathway therebetween which inhibits flow of liquids or contaminants in either direction therethrough. This pathway includes a pair of annular collecting chambers disposed in axially spaced relationship, whereby the outer chamber collects and discharges to the environment any contaminants which enter from the environment, and the inner chamber collects and discharges back to the reservoir any lubricant or fluid which enters into the pathway from its inner end.Type: GrantFiled: March 27, 1987Date of Patent: May 10, 1988Assignee: Durametallic CorporationInventors: Kenneth G. Kakabaker, Duane A. Avard
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Patent number: 4739998Abstract: A bidirectional shaft seal includes a plurality of concentric, radially-staggered contact surfaces arranged so as to engage a shaft along elliptical contact bands. Each contact band forms a static and dynamic barrier to prevent leakage under clockwise and couterclockwise shaft rotation. The elliptical contact may be achieved by offsetting the center of the seal lip from the axis of the shaft or by eccentrically clamping or bonding the seal lip within a seal case and mounting the seal lip concentrically with the shaft.Type: GrantFiled: November 21, 1986Date of Patent: April 26, 1988Assignee: Federal-Mogul CorporationInventors: Bradley L. Steusloff, Frederick R. Hatch
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Patent number: 4739999Abstract: A steel laminate gasket for an internal combustion engine having a cylinder liner with a cylindrical portion and a flange. The gasket comprises an upper plate situated above the flange and the cylindrical portion, a lower plate having a lower opening, and a plurality of middle plates situated between the upper and lower plates. The diameter of the lower opening is larger than the inner diameter of the cylindrical portion of the cylinder liner and is smaller than the outer diameter of the cylindrical portion. The gasket is further provided with a main sealing device formed by at least one of the middle plates, and an auxiliary sealing device formed by at least one of the upper plate and middle plates. The auxiliary sealing device is weaker than the main sealing device and is situated adjacent to a curved portion of the lower plate between a main lower portion and a collar of the lower plate.Type: GrantFiled: April 20, 1987Date of Patent: April 26, 1988Assignee: Ishikawa Gasket Co., Ltd.Inventors: Mitsuru Ishii, Yoshio Yamada
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Patent number: 4739997Abstract: A pressurized bearing seal which uses pressurized air (1) to expand a sealing member which surrounds a shaft supported by the bearing to create a seal between the shaft and bearing, and (2) for an air purge from the bearing along the shaft to prevent intake of foreign particles into the bearing along the shaft. A ring assembly, which is secured to the bearing, surrounds the expandable member and has a conduit formed therein for purging or bleeding pressurized air along the shaft to the atmosphere.Type: GrantFiled: September 5, 1986Date of Patent: April 26, 1988Assignee: Potlatch CorporationInventor: Michael A. Smetana