With Mechanical Sealing Patents (Class 418/51)
  • Patent number: 10316844
    Abstract: An anti-locking mechanism of a spherical compressor rotor, an anti-locking power mechanism of a spherical compressor, and a spherical compressor. A pin boss is fixedly arranged on a turntable shaft, and guide pins are movably connected with a guide sleeve. A concave slideway is arranged in a cylinder block spherical surface or a cylinder lower spherical surface, and is distributed along a sliding track of the guide sleeve on the corresponding cylinder block spherical surface or cylinder lower spherical surface in a rotation process of a turntable. A main shaft rotates and drives the turntable. When the turntable rotates to a position at which a turntable axis and a piston axis are superposed, the turntable can continue to rotate around the turntable axis by means of torque obtained by the guide pin from the concave slideway, and thus a problem of a dead point of movement of a spherical compressor rotor is solved.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: June 11, 2019
    Assignee: Shenzhen Zhongke Zheng'an Science & Technology Partnership Enterprise (limited partnership)
    Inventor: Luyi Wang
  • Patent number: 9470220
    Abstract: A module, a base module and a system which comprises a module and a base module includes a pump channel and a valve unit which is connected with the pump channel wherein a fluid can be pumped through the pump channel and the valve unit, wherein a first wall section of the valve unit is flexible. The pump module has a movable valve body arranged in the valve unit, wherein the valve body can occupy an idle position in which the valve body closes the valve unit to prevent fluid from passing through. The valve body can occupy an operating position in which the valve body allows the fluid to flow through the valve unit and in which the valve body can be put in operating position through a deformation of the first wall section of the valve bodies so that the fluid can flow through the valve unit.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: October 18, 2016
    Assignee: FRESENIUS KABU DEUTSCHLAND GMBH
    Inventor: Michael Becker
  • Patent number: 8662870
    Abstract: A swash pump for compressible fluids uses sealing contacts made between the nutatable swash plate and the fixed cone plates to center and locate the inner swash sphere which slides against two resiliently mounted ring seals only, minimizing pump friction. A slanted end of a common drive shaft supporting and turned by the rotor of an integrated, variable speed motor causes nutation of the sphere. All bearings, especially axially slidable roller bearings inside the sphere, may settle in position with respect to the common shaft for least frictional loss. This pump is also adapted for pumping explosive gases.
    Type: Grant
    Filed: September 18, 2009
    Date of Patent: March 4, 2014
    Assignee: Swashpump Technologies Limited
    Inventors: Lindsay Bruce Dalziel, Benno Frank Smit
  • Publication number: 20140044580
    Abstract: A rotary volumetric machine having a stationary structure; a rotor, which can turn with respect to the stationary structure about a principal axis of rotation; a work chamber formed within said rotor; a disk, which is housed in said work chamber and can turn with respect to the stationary structure about a secondary axis of rotation fixed with respect to said stationary structure, the secondary axis of rotation being inclined with respect to said principal axis of rotation, said disk having a radial through groove; a diaphragm, which is fixed with respect to said rotor, extends in said work chamber, and engages said radial groove of said disk; and an inlet opening and an outlet opening for a working fluid, which are formed in said rotor, communicate with said work chamber, and are located on opposite sides of said diaphragm.
    Type: Application
    Filed: November 10, 2011
    Publication date: February 13, 2014
    Applicant: CAPTECH S.r.l.
    Inventors: Raffaella Monti, Andrea Pancaldi, Elisa Pancaldi
  • Patent number: 8523545
    Abstract: A reinforcing interface between the stator and its housing in a progressing cavity pump is created from ribs extending inwardly into the stator from the housing inner wall that can be longitudinally oriented or spirally oriented. Alternatively, the housing wall can have grooves into the inner wall that are made more bulbous further into the housing wall from the groove inlets so that when filled with stator material a long and continuous grip is obtained with either the wall groove embodiment or the internal rib embodiment.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: September 3, 2013
    Assignee: Baker Hughes Incorporated
    Inventors: Phillip R. Wilbourn, Charles C. Collie, Larry V. Dalrymple
  • Publication number: 20130011287
    Abstract: A rotatable drive shaft in the swash pump or turbine for liquids is supported by one bearing at each end. An integrated motor or dynamo uses the same two bearings. The compound first bearing supports a slanted section of the drive shaft placed inside the inner swash sphere, and transfers rotational power to the attached nutatable swash plate. The second bearing confines rotation of the drive shaft in a defined axis. Either one of the bearings is made to prevent axial movement of the drive shaft, preventing swash pump misalignment. A resilient drive, and an immersed pump are described.
    Type: Application
    Filed: April 24, 2010
    Publication date: January 10, 2013
    Applicant: SWASHPUMP TECHNOLOGIES LIMITED
    Inventors: Lindsay Bruce Dalziel, John Layne, Benno Frank Smit
  • Publication number: 20120294747
    Abstract: A rotary engine has a cycloid rotor and a sealing grid including a face seal that rotates with the rotor, and including other seals that do not rotate with the rotor. As the rotor rotates within a housing, the rotor, housing and seal grid form at least one working chamber between them, the chamber undergoing a change from initial volume V1 to V2, which is less than V1, thus compressing a working medium, and subsequently expanding to volume V3, which may be larger than V1, such that the chamber volume is a smooth and continuous function of rotor's rotational angle.
    Type: Application
    Filed: July 17, 2012
    Publication date: November 22, 2012
    Applicant: LIQUIDPISTON, INC.
    Inventors: Nikolay Shkolnik, Alexander C. Shkolnik
  • Patent number: 8029254
    Abstract: Provided is scroll-type fluid machine that facilitates the formation of a back-pressure chamber so as to increase the design freedom in the space on the back side of the revolving scroll member, where it is difficult to ensure sufficient space, by decreasing, as much as possible, the installation space of the sealing member partitioning the back-pressure chamber. In the scroll-type fluid machine, a back-pressure chamber to which high-pressure gas is introduced is partitioned between the revolving scroll member and a fixed support member, a sealing member is constructed of an annular U sealing member, the annular U sealing member is oriented in a direction orthogonal to the back side of the revolving scroll member, and one side contacts a side surface (sealed surface) of a fixed support member.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: October 4, 2011
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hajime Sato, Yoshiyuki Kimata
  • Publication number: 20110200474
    Abstract: A swash pump for compressible fluids uses sealing contacts made between the nutatable swash plate and the fixed cone plates to centre and locate the inner swash sphere which slides against two resiliently mounted ring seals only, minimising pump friction. A slanted end of a common drive shaft supporting and turned by the rotor of an integrated, variable speed motor causes nutation of the sphere. All bearings, especially axially slidable roller bearings inside the sphere, may settle in position with respect to the common shaft for least frictional loss. This pump is also adapted for pumping explosive gases.
    Type: Application
    Filed: September 18, 2009
    Publication date: August 18, 2011
    Applicant: SWASHPUMP TECHNOLOGIES LIMITED
    Inventors: Lindsay Bruce Dalziel, Benno Frank Smit
  • Patent number: 7837451
    Abstract: A positive displacement capture device contains a rotor portion positioned inside a casing portion to act as a least area rotor which captures a volume and moves the volume along the length of the separator. The rotor portion contains a plurality of lobes which interact with grooves in the casing portion, such that the interaction of the lobes and grooves create barriers which capture the volume. The creation of the volume creates a flow barrier between a downstream end of the separator and an upstream end of the separator. The flow separator is coupled to a combustion portion to provide a flow of material to the combustion portion. There is a non-contact seal between the lobes and the grooves, and the lobes have channels or depressions at their ends.
    Type: Grant
    Filed: February 29, 2008
    Date of Patent: November 23, 2010
    Assignee: General Electric Company
    Inventors: James Fredric Wiedenhoefer, Adam Rasheed
  • Publication number: 20100143173
    Abstract: A swash-plate machine for pumping fluids uses dual swash plates in complementary or mirror-image orientation. The vibration that is generated as a reaction to forced nutatory motion imposed on a single swash plate is thereby largely cancelled. Rotated orientation of the divider plate position in one chamber with respect to the other (preferably 90 degrees difference) provides four outputs per revolution instead of the two available from both sides of a single swash plate. Improved bearings for the part-spherical swash plate base permits only oscillatory movement for that part and facilitate better sealing.
    Type: Application
    Filed: February 20, 2008
    Publication date: June 10, 2010
    Applicant: SWASHPUMP TECHNOLOGIES LIMITED
    Inventors: Lindsay Dalziel, Lan Le Noc
  • Patent number: 7707815
    Abstract: An axial flow positive displacement engine has an inlet axially spaced apart and upstream from an outlet. Inner and outer bodies have offset inner and outer axes extend from the inlet to the outlet through first, second, and third sections of a core assembly in serial downstream flow relationship. At least one of the bodies is rotatable about its axis. The inner and outer bodies have intermeshed inner and outer helical blades wound about the inner and outer axes respectively. The inner and outer helical blades extend radially outwardly and inwardly respectively. The helical blades have first, second, and third twist slopes in the first, second, and third sections respectively. The first twist slopes are less than the second twist slopes and the third twist slopes are less than the second twist slopes. A combustor section extends axially downstream through at least a portion of the second section.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: May 4, 2010
    Assignee: General Electric Company
    Inventors: Kurt David Murrow, Rollin George Giffin, Oladapo Fakunle
  • Patent number: 7530217
    Abstract: An axial flow positive displacement engine has an inlet axially spaced apart and upstream from an outlet. Inner and outer bodies have offset inner and outer axes extend from the inlet to the outlet through first, second, and third sections of a core assembly in serial downstream flow relationship. At least one of the bodies is rotatable about its axis. The inner and outer bodies have intermeshed inner and outer helical blades wound about the inner and outer axes respectively. The inner and outer helical blades extend radially outwardly and inwardly respectively and have first, second, and third twist slopes in the first, second, and third sections respectively. The first twist slopes are less than the second twist slopes and the third twist slopes are less than the second twist slopes. A combustion section extends axially downstream from the second section through at least a portion of the third section.
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: May 12, 2009
    Assignee: General Electric Company
    Inventors: Kurt David Murrow, Brandon Flowers Powell
  • Patent number: 7270106
    Abstract: In a nutating engine (or more generally a rotary displacement device) the cycling of combustion occurs between inner and outer spherical surfaces. The combustion chambers are additionally defined only by the surfaces of teeth of specially designed gears. These gears are the Rotator (2), two consecutive of some number of free-planetary gears (3A-E), and the lobed Nutating Member (1). The latter is enjoined to execute precessional rotation relative to the former and maybe both affixed with counterweights (11A,B; 12A,B) and subjected to reverse-English transforming the precessional rotation to a stress-free mode in both the Newtonian and Eulerian sense. The insertion of optional butterfly-shaped plugs (4A-E, 5A-E, 8A-E) boosts the compression ratio. Truly, no past engine possesses the characteristics of the instant invention.
    Type: Grant
    Filed: June 23, 2005
    Date of Patent: September 18, 2007
    Inventor: John Stark
  • Patent number: 6442935
    Abstract: A driving system (13) comprises a housing (10) having spherical hollow space (11), a rotatable main shaft (14), a driving means (16) and a piston construction (15). The piston construction (15) is rockable about a first rocking axis (15a) in a rectilinear motion backwards and forwards relative to a stationary wall portion (12). The driving means (16) is pivotally mounted in the main shaft (14) about a pivotable axis (16b) which forms an acute angle with the rotatable axis (14a) of the main shaft (14) and is rockably mounted in the piston construction (15) about a second rocking axis (16a), which extends at right angles to the first rocking axis (15a). The first and second rocking axis (15a, 16a) cross the rotational axis (14a) of the main shaft (14) at a common crossing point (11c) centrally in the spherical hollow space (11).
    Type: Grant
    Filed: April 13, 2001
    Date of Patent: September 3, 2002
    Assignee: 3D International A/S
    Inventor: Thor Larsen
  • Patent number: 5466133
    Abstract: A peristaltic pump having a shaft mounted within a housing and coupled with a rotor to induce nutation in a wobble plate. A pump diaphragm is located and affixed to one side of the wobble plate and at its periphery to the housing. A backup diaphragm is employed on the other side of the wobble plate and provides a resilient coupling through a driven plate with the rotor. A spherical mount supports the wobble plate and is spring biased such that the mount and the resilient coupling provide a resilient mounting for the nutating wobble plate. A pump casing associated with the diaphragm defines a pump cavity with the pump diaphragm. An inlet and an outlet having ball check valves or flapper valves control flow. The pump diaphragm includes a ridge selectively positioned at the intersection with the diaphragm frame plate and with the wobble plate to increase resistance to liquid pressures on the diaphragm.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: November 14, 1995
    Inventor: Alan D. Tuck, Jr.
  • Patent number: 4919601
    Abstract: An air compressor having a tilting disc which is actuated in waveform. The tilting disc is adapted to abut mounting the disc on conical surfaces of side casings by an eccentric shaft, and is moved in waveform but not rotated against the rotation of the eccentric shaft so that the intake and exhaustion of air may be realized.
    Type: Grant
    Filed: February 14, 1989
    Date of Patent: April 24, 1990
    Inventor: Jong D. Kim
  • Patent number: 4877379
    Abstract: A rotary mechanism for a three-dimensional volumetric change including a rotor having a partially spherical surface as a bottom surface and a substantially conical surface which includes a plurality of apexes extending substantially radially, and a member having a curved surface constituted by a surface defined by a locus of the apex due to precessing motion of the rotor. A space defined in a spherical space and having its volume changed by relative precessing motion between the member and the rotor serves as a working space. The rotor is substantially spherical cone with apexes and the curved surface of the member is a spherical peritrochoidal surface. The rotor conical surface is optimumly an inner envelope of the spherical peritrochoidal surface produced by the relative precession. The rotary mechanism may be expansion and/or compression machine; pump, blower or internal combustion engine, or generally, energy conversion machine.
    Type: Grant
    Filed: June 25, 1987
    Date of Patent: October 31, 1989
    Inventor: Kunio Okabe
  • Patent number: 4441869
    Abstract: The power conversion machine has a piston which is adapted to effect a combined turning and rocking movement internally in a double-curved space. The piston is in drive connection with a rotary shaft via an eccentric disc which is obliquely disposed on the center axis of the rotary shaft. The center axis of the rotary shaft and the center axis of the eccentric disc cross each other in the center of the double-curved space. The double-curved space in defined within a ball shell and is divided into two opposing substantially ball-shaped spaces by means of a stationarily secured circular partition plate. The piston operates simultaneously in the two semi-spherical spaces, the piston passing through the partition plate via a diametrically extending slot. The piston comprises a disc-shaped main portion, and two oppositely directed roller portions which are received in respective semi-spherical spaces.
    Type: Grant
    Filed: January 15, 1982
    Date of Patent: April 10, 1984
    Inventors: Thor Larsen, Terje Samdal
  • Patent number: 4324535
    Abstract: A slant axis rotary piston mechanism including a shaft (42) having an angularly offset eccentric (44) and a housing (10) defining a general spherical chamber (22) journalling the shaft and containing the eccentric. A peripheral, generally sinuous partition (20) is fixed in the housing and extends radially into the chamber towards the eccentric. A rotor (62) is journalled on the eccentric and is of generally spherical exterior configuration (64) and has a peripheral groove (66, 68, 70) extending about and opening to its periphery. Each of the sides (66 and 68) of the groove face a corresponding side (24, 26) of the partition and define therewith at least two working volumes of variable volume. Gears (108, 110) synchronize relative movement between the shaft, the rotor and the housing, and ports (90, 92, 94, 96) provide for ingress and egress of working fluid to the working volumes.
    Type: Grant
    Filed: January 24, 1980
    Date of Patent: April 13, 1982
    Assignee: Caterpillar Tractor Co.
    Inventor: John M. Clarke
  • Patent number: 4181478
    Abstract: A rotary mechanism having improved seal life including a housing defining an operating chamber having a wall configuration based on a desired geometrical shape which is an n order harmonic curve where n is an integer of 1 or more, a shaft journalled in the housing and having an eccentric within the chamber, and a rotor within the chamber and journalled on the eccentric and having a working surface based on the desired geometric shape and which is an n+1 order harmonic curve to define n+1 equally angularly spaced apexes or noses on the surface. n+1 seals are carried by the rotor, one at each apex or nose and timing gearing interconnects the rotor and the housing to establish relative rates of rotation between the housing, the shaft and the rotor. The chamber wall further is defined by an n+1 harmonic curve superimposed on the n order harmonic curve which minimizes relative movement between the seal and the rotor to improve the life of the seals.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: January 1, 1980
    Assignee: Caterpillar Tractor Co.
    Inventor: John R. Weber
  • Patent number: 4056336
    Abstract: An improved apex seal construction for slant axis rotary mechanisms. The mechanism includes a housing defining a chamber having radially inner and outer spherical walls interconnected by opposed, generally radially extending side walls, a shaft journalled in the housing and having an angularly offset portion within the chamber, a rotor within the chamber and journalled on the angularly offset portion. The rotor has a spherical hub and a peripheral, radially outwardly extending flange having plural apexes on each side thereof, each apex being provided with an apex seal receiving groove extending radially the length of the flange and into the hub. An apex seal is loosely received in each groove and extends therefrom to sealingly engage a corresponding one of the side walls.
    Type: Grant
    Filed: July 2, 1976
    Date of Patent: November 1, 1977
    Assignee: Caterpillar Tractor Co.
    Inventor: James A. Ritchie
  • Patent number: 4029444
    Abstract: A rotary piston machine of the type having a slant or precessing rotor or the type having a parallel axis rotor, such as a Wankel engine, having a rotor seal grid formed from peripheral and apex seals which are connected together at their adjacent ends by connectors, often called bolts, located in sockets in the rotor. An arcuate seal extends peripherally around each bolt in the manner of a piston ring between the peripheral surface of the bolt and the adjacent peripheral wall of the socket in which the bolt is located, to effect sealing between the peripheral walls of the bolt and the socket without inhibiting relative movement of the bolt in the socket.
    Type: Grant
    Filed: October 10, 1975
    Date of Patent: June 14, 1977
    Assignee: Caterpillar Tractor Co.
    Inventor: John Michael Clarke
  • Patent number: 4028020
    Abstract: An improved slant axis rotary mechanism such as an engine, a compressor, a pump, or the like. The mechanism includes a housing, a shaft journalled in the housing having an angularly offset portion within the housing, and a rotor journalled within the housing on the angularly offset portion. The rotor hub has a pair of opposed grooves, each of which is adapted to receive a closed unitary annular seal which can be inserted therein to a predetermined depth. Additionally situated within each groove is a back-up spring urging the seal to bear against the housing and an O-ring providing a static seal between the seal and the groove.
    Type: Grant
    Filed: September 8, 1975
    Date of Patent: June 7, 1977
    Assignee: Caterpillar Tractor Co.
    Inventor: James A. Ritchie
  • Patent number: 4011030
    Abstract: An improved internal combustion engine including a housing defining an operating chamber having a wall, an output shaft journalled in the housing and a piston operatively associated with the shaft and movable within the housing. The piston is provided with a seal receiving groove and the groove receives both a compression seal and an oil seal. In a preferred embodiment, the groove includes a step to define a relatively deep compression seal receiving portion and a relatively shallow oil seal receiving portion.
    Type: Grant
    Filed: October 31, 1975
    Date of Patent: March 8, 1977
    Assignee: Caterpillar Tractor Co.
    Inventors: Paul J. Staebler, Ziedonis I. Krauja, Alexander Goloff
  • Patent number: 4008989
    Abstract: A rotary piston machine of the type having a slant or precessing rotor or the type having a parallel axis rotor, such as a Wankel engine, having a rotor seal grid formed from peripheral and apex seals extending around surfaces of the rotor and together defining closed working chambers in a housing in which the rotor is rotatable, adjacent ends of the seals being connected together by connectors, often called bolts, located in sockets in the rotor. Each bolt has clearance laterally of its longitudinal axis from the peripheral wall of the socket to permit lateral movement of the bolt in the socket except in one direction laterally of the longitudinal axis of the bolt, in which direction, movement of the bolt is restrained by the bolt being held between fixed laterally opposite positions engaging its peripheral surface.
    Type: Grant
    Filed: October 10, 1975
    Date of Patent: February 22, 1977
    Assignee: Caterpillar Tractor Co.
    Inventors: John Michael Clarke, David Stuart Gilchrist
  • Patent number: 4008986
    Abstract: An improved corner seal for rotary mechanisms, such as trochoidal or slant axis rotary mechanisms. The mechanism includes a housing defining a chamber with a rotor movable therein. The rotor includes a piston seal receiving bore and a piston seal is received in the bore and sealingly engages one wall of the chamber. An apex seal receiving groove is located in the rotor and intersects the bore. An apex seal is received in the groove and sealingly engages another wall of the chamber. A ring-like expander seal is within the bore and sealingly engages the piston seal and the bore when gas under pressure is directed to the bore from the groove.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: February 22, 1977
    Assignee: Caterpillar Tractor Co.
    Inventor: Myron R. Gibson
  • Patent number: 4008014
    Abstract: An improved rotary mechanism including a housing defining an operating chamber, a shaft journalled in the housing and extending through the chamber, and a rotor having plural apices journalled on the shaft and within the chamber. The rotor includes apex seal receiving grooves at its apices and piston seal receiving bores intersecting the grooves. Apex seals are disposed in the apex seal receiving grooves while piston seals are disposed in the bores. Balance pistons are disposed within the bores and abut the associated piston seals adjacent the point of intersection of the bores and the grooves and fluid passages establish fluid communication between the bores and a portion of the rotor surface remote from the corresponding apex to provide for gas energization of the piston seals either by gas pressure directly against the piston seals or indirectly through gas pressure applied to the balance pistons for all cyclic stages of operation of the mechanism.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: February 15, 1977
    Assignee: Caterpillar Tractor Co.
    Inventor: Paul J. Staebler
  • Patent number: 3999902
    Abstract: An improved slant axis rotary mechanism including a housing defining an operating chamber having generally radially extending opposed side walls, a shaft having an angularly offset portion journalled in the housing with the angularly offset portion within the chamber and a rotor within the chamber journalled on the angularly offset portion. The rotor includes a peripheral flange and each side of the flange has plural apices thereon, each carrying seals engaging a corresponding one of the side walls. The flange sides are slightly relieved only in the vicinity of each apex whereby sufficient clearance to prevent interference between the rotor and the housing during operation is achieved without significantly diminishing the compression ratio of the mechanism. A method of fabricating a rotor for a slant axis rotary mechanism is also disclosed.
    Type: Grant
    Filed: November 5, 1975
    Date of Patent: December 28, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Donald F. Walker
  • Patent number: 3988078
    Abstract: A rotary mechanism including a housing defining a chamber including an operating cavity, a shaft journalled by the housing, and a rotor within the chamber and journalled on the shaft, the rotor having a plurality of apices on one side thereof. There is a plurality of apex seal-receiving grooves in the rotor, one at each apex, and at least one peripheral seal-receiving groove in a different surface of the rotor and intersecting the apex seal-receiving grooves. The mechanism includes a plurality of elongated apex seals, one at each apex seal-receiving groove, and each apex seal has a first groove in an end thereof in substantial alignment with the peripheral seal-receiving groove and a second groove opening into the corresponding apex seal-receiving groove. Peripheral seals are disposed in the peripheral seal-receiving groove and extended therealong substantially to the first grooves in the apex seal ends.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: October 26, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Noble G. Barker
  • Patent number: 3981640
    Abstract: An improved slant axis rotary mechanism including a housing defining an operating chamber, a shaft journalled in the housing having an angularly offset portion within the chamber and a rotor within the chamber and journalled on the angularly offset portion. The rotor has an annular flange provided with plural apices on each side thereof. Peripheral seals are carried about the periphery of the flange and sealingly engage the housing. At each apex there is a generally radially extending groove and an apex seal is loosely carried in each such groove and sealingly engages the housing. A bolt seal is carried at each apex on the periphery of the flange and sealingly engages the housing. Each bolt seal has a first pressure-responsive surface in fluid communication with the corresponding groove and a second pressure-responsive surface in fluid communication with the side of the flange opposite the corresponding apex.
    Type: Grant
    Filed: September 8, 1975
    Date of Patent: September 21, 1976
    Assignee: Caterpillar Tractor Co.
    Inventor: Alexander Goloff