Patents Examined by Robert S. Ward
  • Patent number: 4795169
    Abstract: A mechanical face seal has a first seal face member mounted in fixed rotational and radial relationship to one component and sealed with respect thereto; abutment means mounted in fixed rotational and radial relationship to a second component and sealed with respect thereto; and a second seal face member interposed between the first seal face member and the abutment means. Spring means is arranged to apply an axial load between the first and second seal face members, said second seal face member having opposed faces, one of said faces being maintained in sealing engagement with a corresponding face on the first seal face member under the axial load applied by the spring means and the other face being sealed with respect to a corresponding face on said abutment means.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: January 3, 1989
    Assignee: Crane Packing Limited
    Inventors: David J. Lowe, John Kemp
  • Patent number: 4795170
    Abstract: A packing arrangement for sealing the outer surface of a rotary, drum-like object, such as a washer used in manufacturing cellulose, with a non-rotating annular packing, which is most advantageously composed of one or several side-by-side packing fillets, e.g. braided packings, the arrangement including a circular packing body which together with the rotating drum surface, defines a space in which the packings have been installed. The drawback encountered in existing arrangements is wear of the packing, and consequent leakage. In the packing arrangement of the invention, this has been solved in that the packing body is, at least in its radial direction, elastically supported so that, as the drum-like object rotates, the packings yield to the movements of the drum surface arising from radial displacements of the drum.
    Type: Grant
    Filed: October 15, 1986
    Date of Patent: January 3, 1989
    Assignee: Enso-Gutzeit OY
    Inventors: Seppo Kokkonen, Harri Qvintus, Erkki Ruuskanen
  • Patent number: 4795174
    Abstract: An economical gasket assembly for use between glass-lined flanges of sections of glass-lined vessels, which flanges are subject to greater seating stress due to higher temperatures or pressures, which gasket assembly will maintain a seal but not break the glass on the flange seating surface due to the use of a plurality of flexible, compressible corrugated metal sheets interleaved between harder than normal layers of gasket filler material.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: January 3, 1989
    Assignee: The Dow Chemical Company
    Inventor: Gary L. Whitlow
  • Patent number: 4795172
    Abstract: A distortable diaphragm seal, which is preferably formed of felt, seals each end of a nut through which a screw extends. Grease, which is introduced into the interior of the nut to function as a lubricant, is sealed therein by the seal. The seal has an opening of substantially the cross sectional shape of the screw normal to the axial centerline of the screw to permit part of the seal to extend circumferentially along the unthreaded O.D., and to permit another portion of the diaphragm seal to run into, and out of, a helical groove in the ball screw, thus forming a continuous seal on the screw surface.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: January 3, 1989
    Assignee: Cincinnati Milacron Inc.
    Inventor: David Brande
  • Patent number: 4795168
    Abstract: A magnetic-type end face seal assembly for creating an airtight seal between a housing and a rotatable shaft which projects outwardly through a housing bore. An insert ring of magnetically attractable material surrounds the shaft within the bore, and has a seating ring of hard synthetic material externally fixed thereto and sealingly engaged with the wall of the housing bore. The insert ring defines a first annular seal face on the outer axial end thereof. A rotating ring arrangement encircles and is nonrotatably coupled to the shaft axially adjacent the insert ring. This rotating ring arrangement includes a ring-shaped magnet which is disposed closely axially adjacent but slightly spaced from the insert ring, and this magnet mounts thereon a face ring which defines a second annular seal face which is maintained in engagement with the first seal face due to the magnetic attraction between the magnet and the insert ring.
    Type: Grant
    Filed: February 23, 1988
    Date of Patent: January 3, 1989
    Assignee: Durametallic Corporation
    Inventors: William V. Adams, Duane A. Avard, Leroy A. Waling
  • Patent number: 4793621
    Abstract: A seal assembly for sealing the annulus defined between two telescopically related cylindrical surfaces comprises an annular groove in one of the cylindrical surfaces haiving recessed end walls for receiving the axial end portions of an annular elastomeric element. A retaining C-ring is snapped into position to lie between the overhanging lip defined by one of the annular recesses and compress a reduced diameter end portion of the annular elastomeric seal element into snug engagement with the bottom of the groove.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: December 27, 1988
    Assignee: Baker Hughes Incorporated
    Inventor: John C. Heinze
  • Patent number: 4793620
    Abstract: An arrangement for sealing around a pedal which extends through an opening in a housing includes a flexible base slidably coupled to the housing. A frame is mounted on the base and carries rollers which engage an arm of the pedal. A flexible boot or sleeve has one end fixed to the frame and another end fixed to the arm of the pedal.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: December 27, 1988
    Assignee: Deere & Company
    Inventor: Rudi Karch
  • Patent number: 4792146
    Abstract: A radially compliant and zero net thermal radial taper mechanical face seal. The seal includes a primary seal ring which is radially compliant to the opposing ring due to its narrow ring length, and an opposing ring which has a geometry and physical characteristics such that the thermal rotation caused by itself and the primary ring is zero. The seal includes further design features for enhancing the radial compliance and the zero net thermal rotation characteristics.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: December 20, 1988
    Assignee: University of New Mexico
    Inventors: Alan O. Lebeck, Lionel A. Young
  • Patent number: 4790544
    Abstract: A seal in an aperture, e.g., a duct, is made by foaming a foamable substrate within an envelope in the aperture, to expand the envelope, which desirably has sealant or adhesive on its outer surface, to conform it into sealing engagement with the aperture. The envelope is closed and is of wraparound configuration so as to seal a large variety of aperture sizes, whether empty or containing objects, such as cables.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: December 13, 1988
    Assignee: Raychem GmbH
    Inventor: Christian F. Kemp
  • Patent number: 4790542
    Abstract: A gland seal for addition to a boiler and furnace structure which has pipes (20) passing through a waterwall (12) and seal box (30). The gland seal includes a packing (40) of ceramic rope of square cross-section wrapped on the pipes (20) adjacent the front plate (34) of the seal box (30) with a hose clamp (41) radially constricting the packing and a pressure plate (42) driven by nuts (46) on threaded studs (44) adjacent the pipes (20) axially constricting the packing to eliminate ash leakage through the waterwall joint.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: December 13, 1988
    Assignee: Combustion Engineering, Inc.
    Inventor: Richard Kalinowski
  • Patent number: 4790543
    Abstract: A sealing device for a slot between two elements, which are rotatable relative to each other, e.g. an outer and an inner race ring in a rolling bearing, incorporates a flexible sealing portion having a lip, which contacts a sealing surface surrounding the lip. The sealing portion is rotatable, and the centrifugal force acts upon it thus that it tends to leave the surface at increasing rotational speed. In order positively to avoid that the lip is urged so hard against the surface at high rotational speeds, that an unallowable temperature increase occurs, the sealing portion and the surface have profiles of such shape, that the lip is displaced in a direction which has a component directed radially outwards relative to the rotational axis, when the sealing portion with the lip is bent by the centrifugal force.
    Type: Grant
    Filed: November 10, 1987
    Date of Patent: December 13, 1988
    Assignee: Aktiebolaget SKF
    Inventors: Henning Wittmeyer, Magnus Kellstrom, Staffan Jarskar, Matts Floderus
  • Patent number: 4789168
    Abstract: A sealing bush for a moving part has a packing made up of two concentric layers which are bonded to one another. The outer layer consists of a material such as graphite having good resilience. The inner layer, on the other hand, consists of a material such as sealing cord having a coefficient of friction with the moving part which is lower than the coefficient of friction between the moving part and the outer layer. The outer layer bears against the inner layer.
    Type: Grant
    Filed: January 7, 1987
    Date of Patent: December 6, 1988
    Inventor: Achim Daume
  • Patent number: 4789167
    Abstract: A self-energizing pipe gasket includes a base and arm configuration projecting therefrom which cooperates with the base when pipe sections are assembled to cause the lip or sealing edge of the arm to kick away or distend towards the sealing surface of the pipe. To facilitate this action a harder insert is provided in the base in the form of a reinforcing ring providing a less compressible surface for the arm to react against. The ring also stiffens the gasket making it more difficult to dislodge upon assembly of the pipe sections enabling higher compression forces and assuring that the gasket does not go under or below the minimal compression requirements to form a sound flexible yet fluid tight seal. In one embodiment a raised portion of the arm is manufactured in contact with a surface of the base and in another embodiment the gasket includes two symmetrical arms each of which includes four surfaces.
    Type: Grant
    Filed: February 20, 1987
    Date of Patent: December 6, 1988
    Assignee: Hamilton Kent Manufacturing, Inc.
    Inventor: Jim Housas
  • Patent number: 4787641
    Abstract: An arrangement for sealing a chamber containing pressure medium against a movable band. The band is arranged to form one side of the chamber. The arrangement comprises a sealing framework which is fastened to a body part of the chamber by means of a resilient membrane. The sealing framework is further provided with a sealing means for providing a sealing effect between the movable band and the rest of the chamber. The sealing means is thereby arranged to be pressed against the band by the pressure effect of a load medium fed on one side of the resilient membrane. In order to obtain an effective and adaptable sealing effect, the means for providing the sealing effect is formed by at least two sealing elements arranged in parallel and between which a sealing liquid is provided.
    Type: Grant
    Filed: December 22, 1987
    Date of Patent: November 29, 1988
    Assignee: Oy Tampella AB
    Inventors: Paavo Rautakorpi, Pekka Majaniemi, Jukka Lehtinen
  • Patent number: 4787642
    Abstract: A high pressure seal structure to seal against fluid pressure around a cylinder member movably. The structure includes an integral circular metal sealing ring including a pair of first circular sealing lips having a cross-section of chevron shape axially opening in a first direction to flexibly extend with a first inner lip in sealing relation against the cylindrical surface of the cylinder member and with the first outer lip in sealing relation against a cylindrical wall formed in the housing. Also included is a pair of second circular sealing lips having a cross-section of chevron shape axially opening in a second direction to flexibly extend with a second inner lip in sealing relation against the cylindrical surface and with a second outer lip in sealing relation against the cylindrical wall. A deformable inner sealing ring having a triangular cross-section is closely fitted in the space defined by the first inner lip, the second inner lip, and the cylindrical surface.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: November 29, 1988
    Assignee: Seaboard Wellhead, Inc.
    Inventor: Reggie H. Etheridge
  • Patent number: 4786061
    Abstract: Safety rotary transmissions allow the transfer of fluid media from a stationary casing into the inside of a rotating shaft and back. The apparatus, which has only one face seal, is provided with a blocking device which prevents a contact of metallic parts of the face seal with one another even if there is severe wear of the sliding sealing ring. An exchange of the sealing ring is possible without dismantling the casing.
    Type: Grant
    Filed: June 9, 1987
    Date of Patent: November 22, 1988
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Artur Buchalla
  • Patent number: 4784397
    Abstract: A hollow metallic sealing ring comprised in radial cross-section of pair of outwardly convex limbs contiguous with a loop formation having at least one straight sided loop, the limbs, from their junctions with the ends of the loop formation being of increasing radius towards their free ends which are straight and substantially parallel.
    Type: Grant
    Filed: November 16, 1987
    Date of Patent: November 15, 1988
    Assignees: Michael J. C. Tozer, Specialist Sealing Limited
    Inventor: Michael J. C. Tozer
  • Patent number: 4784395
    Abstract: A circular notch in a rigid annular case element of a shaft seal for preventing distortion of the case during a molding and bending process. The notch is about one-fifth to one-half as deep as the surrounding thickness of the case element and has sloping walls leading to a central flat portion.
    Type: Grant
    Filed: July 11, 1985
    Date of Patent: November 15, 1988
    Assignee: Federal-Mogul Corporation
    Inventor: Steven L. Nickols
  • Patent number: 4784396
    Abstract: A plastic one-piece tubular clip has a base portion embedded in the bolt mounting hole of each of the holes of an engine oil pan gasket, and a tubular shaft portion that projects through the aligned holes of an oil pan rail and an oil pan reinforcing plate, and through which the oil pan mounting bolts are inserted, the tubular portion having internal ridges or teeth to grip the shank of the bolt with its head portion butting up against the bottom of the reinforcing plate to resiliently lock all the pieces together as a subassembly so that the oil pan can be easily assembled to the engine merely by raising the oil pan up against the crankcase with one hand and then pushing each one of the bolts up into their mounting holes and tightening the same with the other hand.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: November 15, 1988
    Assignee: Ford Motor Company
    Inventors: Joseph E. Scott, Frank V. Crocco
  • Patent number: 4783086
    Abstract: An improved seal for a rotary shaft which exerts a pumping effect on a lubricant on its shaft. The seal comprises a substantially rigid annular supporting member and a generally annular elastic sealing member affixed coaxially to the supporting member and extending radially inwardly of the supporting member. The radially inner surface of the said sealing member defines a sealing contact surface adapted to sealingly contact the shaft. The improvement includes a first circumferentially extending portion on the sealing contact surface and a plurality of projecting portions extending axially from one side of the first portion and being circumferentially spaced apart, the first portion having a substantially constant axial width throughout its circumferences.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: November 8, 1988
    Assignee: SKF Industrial Trading & Development Co., B.V.
    Inventors: Johan C. M. Bras, Hendrik W. Wevers