Having Insert Between The Flexible Projections Patents (Class 277/564)
  • Patent number: 10982749
    Abstract: Method for installing a transmission between a drive with a driveshaft and a load with a driven shaft, whereby this transmission includes a housing and at least a drive gear and a driven gear, wherein the method consists of first affixing the transmission over the driveshaft and fastening the housing of the transmission to the housing of the drive and then affixing a shaft seal over the driveshaft.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: April 20, 2021
    Inventor: Stephan Willem Van Praet
  • Patent number: 10215286
    Abstract: A dynamic seal having a contact surface including a fabric is provided. A fatty acid ester is incorporated into the fabric.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: February 26, 2019
    Assignee: Aktiebolaget SKF
    Inventors: Warrick Allen, Stellario Barbera
  • Patent number: 9360051
    Abstract: A shaft bearing with a shaft seal, in particular for water pumps in motor vehicles, arranges a special radial shaft seal inside the outer bearing ring. The seal is made up of a stable rear wall arranged at a certain distance from the water-side of the shaft seal and fixed in the outer bearing ring, a secondary lip seal adjacent to a water-side of the rear wall, a support body solidly fixed in position in the outer bearing ring and adjacent to the secondary lip seal and a primary lip seal fixed in position adjacent to the support body on the water side, i.e. on the pressure side and opposite to the support body as well as opposite the outer bearing ring. Leakage openings are also arranged in the outer bearing ring, between the water-sided shaft seal of the shaft bearing and the rear wall which is arranged at a distance therefrom.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: June 7, 2016
    Assignee: NIDEC GPM GmbH
    Inventors: Andreas Schmidt, Frank Blaurock, Stephan Steinke, Peter Amm
  • Patent number: 9022655
    Abstract: A side seal for a linear guide apparatus including a guide rail, a slider, and a plurality of rolling elements includes seal members formed of different materials, a holder plate and covers. Both seal members have recesses formed in a first face of a base and fitted with a protrusion of the holder plate. Both seal members have respective lips directed in opposite directions separated from each other. A tip of the lip of the first seal member is formed to have a shape in plane contact with the face of the guide rail. A tip of the lip of the second seal member is formed to have a shape in line contact with the face of the guide rail.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: May 5, 2015
    Assignee: NSK Ltd.
    Inventor: Koichi Kawakami
  • Publication number: 20130154200
    Abstract: A shaft seal device is provided in which movement of the seal lip is prevented and the sealing function can be reliably maintained by shaping the adapter so that the adapter is more readily pressed into and less liable to be dislodged from the cartridge, and by increasing the width in the radial direction. An external peripheral-side flange of the adapter fitted into the cartridge on the sealing fluid side of the first lip seal member is formed in a small-diameter tapered shape toward the web side, and the web is composed of an external-periphery-side portion having an orthogonal planar shape that is orthogonal to the center of the shaft, and a tapered internal-periphery-side portion that slopes to the sealing fluid side.
    Type: Application
    Filed: November 10, 2010
    Publication date: June 20, 2013
    Applicant: EAGLE INDUSTRY CO., LTD.
    Inventor: Yasuhisa Arita
  • Patent number: 8282107
    Abstract: An oil seal for reciprocation motion including a seal main body, a resin backup ring, and a holding member. The seal main body includes a seal lip that can be in sliding contact with a reciprocating shaft. The backup ring is disposed such as to support the seal lip from the atmosphere side to ensure durability of the seal lip. In the backup ring, at least a single annular groove is provided on the inner peripheral surface opposing the reciprocating shaft. The annular groove can hold a lubricating material. The holding member holds the backup ring between the holding member and the seal main body in a sandwiched-state. The inner peripheral surface of the backup ring forms a taper that increases in diameter from a sealed side towards an atmosphere side in the axial direction.
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: October 9, 2012
    Assignees: KYB Corporation, Arai Seisakusho Co., Ltd
    Inventors: Kazuyoshi Horiba, Kazuhiko Yonezawa, Shinichi Sumimoto, Seiji Miyazawa
  • Patent number: 8052153
    Abstract: [PROBLEMS] A seal device where a seal lip reliably maintains shaft sealing relative to high-pressure fluid that is to be sealed and where the equivalent Mises stress occurring in the seal lip is reduced to extend the durable term of the seal lip longer. [MEANS FOR SOLVING PROBLEMS] A backup ring (2) has a tapered section (23) continuously extending from a fixation section (21) of the backup ring (2) and also has a forward end section (24). A rounded surface (E) with a curvature radius (R-1) is formed at least at a boundary (26) where a surface (D) of the tapered section (23) changes to a surface (F) of the forward end section (24). A portion of the surface (D) of the tapered surface (23), which portion is in contact with the rounded surface (E) at the boundary (26), is a projected curvature surface having a curvature radius greater than the curvature radius (R-1) of the boundary (26).
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: November 8, 2011
    Assignee: Eagle Industry Co., Ltd.
    Inventors: Hiroshi Ebihara, Yasuhisa Arita, Yasuhiro Ikeda
  • Patent number: 7963526
    Abstract: A radial shaft seal is provided for accommodating large radial offset of the shaft relative to a housing. The seal includes an annular retainer insert provided for engaging the seal to a fixed housing. An annular elastomeric seal body is molded to the retainer insert and includes a flexible axially extending portion extending from an inner surface of the retainer insert. A seal portion extends from a radially inward end of the flexible portion and includes first and second seal lips and an elastomeric bearing surface disposed between the first and second sealing lips. The bearing surface includes a plurality of raised pads adapted to engage the shaft. The pads each include a rounded edge on lateral sides thereof for encouraging the creation of a lubricating film between the pads and shaft. The pads are lubricated by a lubricant disposed in a lubricant chamber disposed between the first and second seal lips.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: June 21, 2011
    Assignee: Freudenberg-NOK General Partnership
    Inventor: John C. Dahlheimer
  • Publication number: 20100237568
    Abstract: A radial shaft seal for sealing a closed inner chamber (K), filled with a fluid medium (M), on a rotating shaft (W) that is guided out of the inner chamber (K) through a receiving opening (2), relative to an external atmosphere (A), has two membrane bodies (3, 4), each having a sealing membrane (5) having a sealing lip (6) positioned obliquely to the inner chamber (K), where the two sealing lips (6) can be positioned on the shaft (W) in sealing fashion at an axial distance from each other, and a supporting device (7) for supporting the membrane bodies (3, 4) resting thereon. To improve the service life and reduce the internal pressures, it is proposed that the two membrane bodies (3, 4) be positioned at a distance from each other over their entire course, and that the supporting device (7) includes a supporting body (8) located between the membrane bodies (3, 4).
    Type: Application
    Filed: June 19, 2008
    Publication date: September 23, 2010
    Inventors: Siegmar Kreutzer, Franz Pawellek
  • Patent number: 7780172
    Abstract: In a rotation shaft seal provided with a rubber lip portion, disposed between a housing and a rotation shaft and sliding on the rotation shaft, and a supporting member receiving the lip portion from a low-pressure side, the cross-sectional configuration of the lip portion in free state is a trapezoid diminishing to the end having the maximum thickness portion within an area received by the supporting member.
    Type: Grant
    Filed: May 2, 2007
    Date of Patent: August 24, 2010
    Assignee: Mitsubishi Cable Industries, Ltd.
    Inventors: Tetsuya Ashida, Hironori Oida
  • Patent number: 7770897
    Abstract: A dynamic shaft seal assembly is provided including a dynamic seal for engaging a rotary shaft. The dynamic seal includes a base portion that is mounted within a casing and has an axially extending barrel portion extending from a radially inner end of the base portion. The axially extending barrel portion terminates in a radially extending leg portion which extends inwardly from an end of the axially extending portion. A generally conically shaped seal portion extends from an end of the radially extending portion and the seal portion includes a radially inner face engaging the shaft and a radially outer face having a stiffening bead integrally formed thereon. The stiffening bead reduces the seal's propensity for “bell mouthing” while the axially extending barrel portion provides improved shaft followability for the dynamic seal.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: August 10, 2010
    Assignee: Freudenberg-NOK General Partnership
    Inventor: Alexander Berdichevsky
  • Patent number: 7722052
    Abstract: A rotation shaft seal to prevent inner leak from increasing along high-pressurization of sealed gas. A staged portion is formed on an outer case, and an end face on an inner side of the staged portion is covered with rubber to form a ring rubber portion of which end face is covered. A rubber end face of the rubber portion and a face on a peripheral edge of a seal element are pressed to each other.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: May 25, 2010
    Assignee: Mitsubishi Cable Industries, Ltd.
    Inventors: Hironori Oida, Tetsuya Ashida
  • Publication number: 20100109253
    Abstract: The invention relates to a journal seal for rolling bearings, wherein the journal seal comprises: —a ring-shaped sealing body (50), which is rotatably fixed to a roller journal (2) with the bearing surface (53) coaxially oriented in relation to the bearing axis (52) and with at least two spaced webs (54, 55) facing away from the bearing axis (52), the webs being directly or indirectly in contact with an annular projection (7), —and—a reinforcing element (51) for reinforcing the sealing body (50). The reinforcing element (51) has a width that is greater than the outer distance (59) of the two webs (54, 55).
    Type: Application
    Filed: January 28, 2008
    Publication date: May 6, 2010
    Inventors: Karl Keller, Konrad Roeingh, Daniel Knie
  • Patent number: 7686308
    Abstract: Systems and methods associated with a fluid-activated shaft seal are provided. The system includes a housing and a seal disposed relative to the housing. The method reduces flow of a fluid between the shaft and the housing. The method involves installing the housing in an opening relative to the shaft and locating the seal relative to the housing. The seal includes a gel material that expands when exposed to a fluid. The seal reduces flow of the fluid through a gap between the housing and the shaft. Advantages of the system and method include reduced wear to the seal due to friction because the seal does not engage the shaft in the absence of a fluid. The seal engages the shaft in the presence of a fluid. Sealing quality is improved by increasing the pressure differential acting on the gel material. In some embodiments, the seal includes a lip portion.
    Type: Grant
    Filed: November 22, 2005
    Date of Patent: March 30, 2010
    Assignee: MIDE Technology Corporation
    Inventor: Marthinus C. Van Schoor
  • Patent number: 7648144
    Abstract: In a sealing device of the present invention, a support ring is fitted in an annular recessed part formed on the inner peripheral surface of a seal lip part independently of a reinforcement ring to support the seal lip part from the inner peripheral side, and the support ring is supported axially by a reinforcement ring via an interposed part. Thereby, when a rotating shaft is inserted into the seal ring, a contact area between a seal part and the rotating shaft can be made appropriate, and when a high pressure is applied to the seal lip part, an increase in contact area between the seal part and the rotating shaft can be suppressed within an appropriate range and the seal part becomes able to follow the eccentricity of the rotating shaft.
    Type: Grant
    Filed: June 17, 2005
    Date of Patent: January 19, 2010
    Assignee: Eagle Industry Co., Ltd.
    Inventor: Masamitsu Sanada
  • Patent number: 7487848
    Abstract: A multi-seal sealing assembly with multiple seals so that when one seal wears out another can be moved into sealing position; and a top drive system for wellbore operations with such a sealing assembly; the sealing assembly in one aspect having a seal carrier movable to move at least one secondary seal into sealing position when a primary seal has worn out.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: February 10, 2009
    Assignee: Varco I/P, Inc.
    Inventors: Larry Wells, Svein Stubstad, Howard Ervin, James D. Brugman, Paul Conover
  • Patent number: 7467798
    Abstract: A rotation shaft seal provided with a rubber sealing portion which contacts a surface of a rotation shaft and an outer case to which the rubber sealing portion is unitedly fixed. The outer case has an inner brim portion on an inner end portion on a sealed fluid side. The inner brim portion is covered by the rubber sealing portion. A sliding portion is disposed on an axis-orthogonal face including the inner brim portion.
    Type: Grant
    Filed: November 2, 2007
    Date of Patent: December 23, 2008
    Assignee: Mitsubishi Cable Industries, Ltd.
    Inventors: Keizo Morimoto, Takeshi Baba
  • Patent number: 7240904
    Abstract: A secondary sealing element comprises a base body (12) made of a synthetic material and comprising a base portion (13) and a seal portion (14) which each comprise coaxially aligned, axially adjacent through bores (17, 31) for the passage of a component, and an annular disc element (25) accommodated in the base portion and comprising a through bore (30) coaxially aligned with the through bores in the base and seal portions and being made of a material which differs from that of the base body. In the unloaded state, the through bore (30) of the annular disc element (25) has a radial dimension d which is greater than that D2 of the through bore (31) in the seal portion (14) and smaller than that D1 in the base portion (13) of the base body (12). The annular disc element consists of a carbon material. An important field of application for the secondary sealing element is that of mechanical face seals for sealing relatively moveable components.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: July 10, 2007
    Assignee: Burgmann Industries GmbH & Co. KG
    Inventors: Peter Dröscher, Klaus Lang, Günther Lederer, Josef Nosowicz, Andreas Schrüfer, Georg Steigenberger, Peter Waidner
  • Patent number: 7234923
    Abstract: In a scroll fluid machine, an orbiting scroll engages with a stationary scroll to form a sealed chamber in which fluid can be compressed toward a center with revolution of the orbiting scroll with respect to the stationary scroll. An annular groove is formed near the outer circumference of the stationary scroll. A dust seal fits in the annular groove of the stationary scroll. The annular groove has almost the same width, but has a wider portion having the twice the width as the other. In the wider portion of the annular groove, the ends of the dust seal are overlapped. The overlapped surfaces are rough to engage with each other.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: June 26, 2007
    Assignee: Anest Iwata Corporation
    Inventor: Toru Sato
  • Patent number: 6783131
    Abstract: A neck seal is disclosed for use in an oil film bearing assembly for a roll in a rolling mill, the roll having a neck with an intermediate tapered section leading to a reduced diameter end section contained within a sleeve, with the sleeve being fixed in relation to the roll neck and being journalled for rotation in a bushing fixed within a chock. The neck seal is adapted to be mounted on the tapered section of the roll neck for rotation therewith at a location surrounded by a seal end plate fixed to the chock. The neck seal comprises a flexible circular body having axially spaced radially outwardly projecting first and second flanges configured and dimensioned to sealingly contact the seal end plate. First and second axially spaced ridges projecting radially inwardly from the circular body for contact with the tapered section of the roll neck.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: August 31, 2004
    Assignee: Morgan Construction Company
    Inventors: Armando S. Martins, Peter N. Osgood, Earl S. Winslow
  • Patent number: 6764080
    Abstract: A rotating shaft seal provided with a seal element, arranged between a housing and a rotation shaft, which contacts the rotation shaft, and a seal member made of rubber having a lip end portion, disposed on a fluid storing chamber side to the seal element, which contacts the rotation shaft, comprising a supporting metal for supporting a rear face of the seal member of rubber.
    Type: Grant
    Filed: January 16, 2002
    Date of Patent: July 20, 2004
    Assignees: Mitsubishi Cable Industries, Ltd., Kabushiki Kaisya Toyoda Jidoshokki Seisakusho
    Inventors: Atsushi Hosokawa, Hiromi Obata, Takeshi Baba, Tomoya Inagaki, Toshiro Fujii, Takayuki Imai, Naoya Yokomachi, Kazuo Murakami
  • Patent number: 6702294
    Abstract: Seal unit for mechanical members rotating relative to each other, in particular foundry rollers, including a tubular member which can be fitted on a first of said rotating members, a first and a second annular sealing member surrounding the tubular member and provided with a first and a second fitting support respectively and corresponding sealing rings of elastomer material. The seal unit also includes an annular spacer member coaxial with the tubular member and acting together with the first and the second support to keep the first and second annular sealing members in their corresponding working positions.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: March 9, 2004
    Assignee: RFT S.p.A.
    Inventor: Mauro Sassi
  • Patent number: 6640943
    Abstract: A shock absorber (2) includes a piston assembly (6) and a damping fluid cylinder (4) having a first end (22) and defining a damping fluid chamber (56). The piston assembly includes a piston (14) mounted to a shaft (8). The piston divides the damping fluid chamber into first and second variable-volume parts (58, 60). At least one restricted flow path is provided between the variable-volume parts of the cylinder, preferably one (18) for compression and one (19) for rebound or extension. A sealing ice scraper assembly (30) is mounted to the first end of the cylinder. The scraper assembly includes a sealing ice scraper sleeve (34) having a generally cylindrical scraper surface (36). A gap of a desired size, typically quite small, is provided between the scraper surface and the shaft. A recess (38) is formed into the scraper surface and houses an outer fluid seal (40) therein.
    Type: Grant
    Filed: August 13, 2002
    Date of Patent: November 4, 2003
    Assignee: Fox Factory, Inc.
    Inventors: Michael J. Daws, Dustin F. Janes, Jr.
  • Patent number: 6450503
    Abstract: A seal assembly to be inserted between two members in relative rotation, including a bushing that is fitted to the first member and is connected with a gasket, wherein both connections form fluid-tight seals. The gasket includes a rigid reinforcement that is fitted via a fluid-tight seal to the second member and a first sealing member, which is made of an elastomeric material and provided with a first annular lip. The first annular lip contacts the sleeve-type coupling portion of the bushing, which is mounted coaxially with the first lip. The portion of the reinforcement facing the bushing is provided with a seat in which a rigid ring made of an oxidation-resistant material is mounted. The rigid ring extends in front of the flange portion of the bushing, which carries a second sealing member made of an elastomeric material. The sealing member is provided with two axially extending lips which axially and radially contact portions of the ring.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: September 17, 2002
    Assignee: Rolf S.p.A.
    Inventors: Luigi Dossena, Rodolfo Sbampato
  • Patent number: 6367811
    Abstract: A rotating shaft seal provided with a seal element, arranged between a housing and a rotation shaft, which contacts the rotation shaft, and a seal member made of rubber having a lip end portion, disposed on a fluid storing chamber side to the seal element, which contacts the rotation shaft, comprising a supporting metal for supporting a rear face of the seal member of rubber.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: April 9, 2002
    Assignees: Mitsubishi Cable Industries, Ltd., Kabushiki Kaisya Toyoda Jidoshokki Seisakusho
    Inventors: Atsushi Hosokawa, Hiromi Obata, Takeshi Baba, Tomoya Inagaki, Toshiro Fujii, Takayuki Imai, Naoya Yokomachi, Kazuo Murakami
  • Patent number: 6267383
    Abstract: A sealing-device having a body section and an anti-extrusion section is shown, the body section being disposed on top of the anti-extrusion section. The body section includes sealing surfaces for enclosures in which the sealing device is located. the anti-extrusion section prevents extrusion of the body section.
    Type: Grant
    Filed: December 30, 1997
    Date of Patent: July 31, 2001
    Inventor: John D. Morvant
  • Patent number: 6123514
    Abstract: A sealing structure for the shaft of a compressor. The sealing apparatus includes an inner ring, and outer ring, and a support ring. The inner ring and the outer rings have flexible annular lips that contact the surface of the rotary shaft. The support ring supports the inner lip and determines the position of the inner lip. The first lip permits fluid leakage along the surface of the shaft, while the second lip forms a fluid-tight seal with the shaft. The support ring prevents the internal pressure of the compressor from pressing the first lip against the shaft with excessive force, which extends the life of the sealing apparatus.
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: September 26, 2000
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakushi
    Inventors: Masahiro Kawaguchi, Hiroshi Kubo, Tomohiko Yokono, Shintaro Miura, Takuya Okuno, Eiji Tokunaga, Atsuyuki Morishita, Ken Suitou
  • Patent number: 6116610
    Abstract: A seal between a pair of relatively axially movable coaxial components is provided by a spring energised plastic seal which is located axially with respect to the outer component to separate a high pressure fluid area from a low pressure fluid area, the spring energised plastic seal has a plastic ring, the plastic ring defining a body portion and a pair of sealing elements, the sealing elements extending coaxially to the high pressure side of the body portion and being spaced radially by spring means, into sealing engagement with opposed surfaces of the two components, a projection extending axially from the low pressure side of the body portion adjacent the external diameter thereof, said projection engaging an axial projection on the outer component so that engagement thereof will support the plastic ring radially.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: September 12, 2000
    Assignee: John Crane (UK) Limited
    Inventors: Ian Martyn Goldswain, Lev Uryevich Roberts
  • Patent number: 6007106
    Abstract: A hydraulic coupling employing a polymeric elastomeric sealing member to provide an excellent seal under pressure. The polymeric elastomeric seal additionally has high resistance to acids, alkalis, hydrocarbons, ketones, ethers, esters, alcohols and salt solutions. The sealing member has the elasticity to return to its normal physical condition after pressure is removed.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: December 28, 1999
    Assignee: Snap-Tite Technologies, Inc.
    Inventor: Steven Wilkins
  • Patent number: 5992856
    Abstract: A seal assembly suitable for static, rotary and reciprocating sealing between the shaft and the housing is provided and includes a seal ring in the shape of an annulus having a body portion with an inside flange and an outside flange extending axially therefrom and establishing a ring seal cavity therebetween. An inside annular spring is disposed in the cavity for biasing the inside flange against the shaft to provide the dynamics seal therebetween. An outside annular spring is also disposed in the cavity for biasing the outside flange against the housing to provide a static seal therebetween and prevent the rotation of the seal ring. A band is disposed in the cavity in between the inside and outside springs for enabling the inside and outside springs to independently bias the inside flange and outside flange, respectively.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: November 30, 1999
    Assignee: Bal Seal Engineering Company, Inc.
    Inventors: Peter J. Balsells, Daniel D. Poon
  • Patent number: 5979904
    Abstract: A seal assembly is provided for rotary and reciprocating sealing between a shaft and a housing. The seal assembly includes a seal ring in the shape of an annulus having a body portion with an inside flange and an outside flange extending longitudinally therefrom. A body portion of the seal ring has a smooth cylindrical exterior surface and the seal ring is formed from a compressible moldable material. A spring is provided and disposed between the flanges for outwardly biasing the flanges from one another to enable sealing between the shaft and the housing. A band is provided and disposed externally around the body portion for holding the seal ring within the housing. A bond is provided between the band and the seal ring by way of striations and grooves which enable the seal ring material to compressibly mold into the band to provide a bond therebetween.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: November 9, 1999
    Assignee: Bal Seal Engineering Company, Inc.
    Inventor: Peter J. Balsells
  • Patent number: 5897119
    Abstract: A floating wiper seal assembly for sealingly engaging a reciprocating shaft within a hydraulic pump or cylinder housing. The seal assembly includes a generally cylindrical elastomeric seal body configured for reception within a cylindrical bore of the housing. An axial bore extends through the seal body for receiving the reciprocating shaft. A pair of opposed flexible annular lips extend radially inwardly from an interior surface of the axial bore for wiping and sealingly engaging the reciprocating shaft, and at least two flexible annular rings extend radially outwardly from the seal body for sealingly engaging an interior surface of the cylindrical bore. The elastomeric seal body is dimensioned and configured to float freely within the cylindrical bore in both a radial and axial direction upon flexure of the annular lips and annular sealing rings in response to reciprocating movement of the shaft while maintaining sealing engagement with the shaft and the pump or cylinder housing, respectively.
    Type: Grant
    Filed: April 18, 1997
    Date of Patent: April 27, 1999
    Assignee: Garlock, Inc.
    Inventor: Ivan L. McMillen
  • Patent number: 5860680
    Abstract: A sealing system for a rotatable fluid conduit coupling or swivel, in particular a swivel for the off-shore oil and gas exploitation or the like, the coupling comprising an inner or first part, an outer or second part concentrically surrounding the first part, an annular chamber formed by the opposite outer and/or inner walls of the inner and outer parts respectively, the chamber being connected to a fluid conduit in the first part and a fluid conduit in the second part, and a clearance between the parts on either side of the chamber which clearances each are sealed by at least one sealing ring located in an annular recess in one and/or the other of the opposite walls forming the clearance, the sealing ring being of resilient low friction material and of the type which allows flexing of the seal lips under over pressure in the clearance from the side of the chamber beyond the pressure behind the sealing ring, the improvement being that in the recess the sealing ring cooperates with or has been provided with m
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: January 19, 1999
    Assignee: Single Buoy Moorings Inc.
    Inventors: Frans Pieter Drijver, Rene Perratone