Separate Flange Or Shoulder Patents (Class 403/336)
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Patent number: 5464302Abstract: An extendible stud, consisting of two substantially identical C-studs each of which has opposed flanges of substantially different widths and inwardly turned lips at the flange outer edges, and each C-stud having an elongate central area in its web located at substantially the middle of said C-stud cross-section, which two C-studs are interconnected by the narrow flange of each being held within the channel formed by the wider flange and the associated lip and web of the other C-stud, and the elongate central areas of the webs of the two C-studs abutting one another.Type: GrantFiled: August 23, 1993Date of Patent: November 7, 1995Assignee: National Gypsum CompanyInventor: Robert J. Menchetti
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Patent number: 5366477Abstract: A link, and assembly and instrument using same, for transmitting actuating forces from an actuating member to a work member. The link includes a link body having a distal end and a proximal end. The distal end of the link body is movably interconnected with the work member by a distal interconnection element such as an arcuate groove-and-flange assembly, and is interconnected at its proximal end to an actuating member by a proximal pivotal interconnection element. The proximal element transmits a first actuating force from the actuating member to the work member. A shoulder, disposed on the link body preferably between the distal and proximal elements for interconnecting, engages the actuating member when a second, greater actuating force is applied to the actuating member in a direction opposite to that of the first actuating force. The greater force is thereby transmitted fully to the work member. The link assembly preferably includes a spacer member to assist positioning of the actuating member.Type: GrantFiled: October 17, 1991Date of Patent: November 22, 1994Assignee: American Cyanamid CompanyInventors: Norman J. LeMarie, III, Francis J. DiFrancesco, Paul DiCarlo, Peter D. Naugler, George J. Sikora
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Patent number: 5362204Abstract: In a gas turbine having a blade carrier (2) which is suspended coaxially in a turbine casing (3), both the turbine casing and the blade carrier are provided with a horizontal junction plane. An exhaust gas casing (5), whose bounding walls consist essentially of an annular inner part on the hub side and an annular outer part (7), is gastightly connected by means of an annular flange (7A) to an annular flange (3A) of the turbine casing (3). Between the annular flanges a two-part separating ring (13) having at least one conically extending face (13A) is disposed. The angle of the conically extending face (13A) has a self-locking effect.Type: GrantFiled: September 1, 1993Date of Patent: November 8, 1994Assignee: Asea Brown Boveri Ltd.Inventors: Kamil Matyscak, Traugott Schmid
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Patent number: 5348387Abstract: A drive and bearing arrangement for a rotatable member such as a concrete mixing drum has a first drive mechanism for providing a rotational drive force to the drum, a primary bearing coupled to the primary drive mechanism and the drum for supporting an end of the drum, an auxiliary bearing for selectively and alternatively supporting the end of the drum in the event of failure of the primary bearing, and an auxiliary drive mechanism for providing a drive force to the drum when the end of the drum is supported by the auxiliary bearing. In one embodiment, the arrangement includes a drive flange coupled to the output of a transmission which includes the primary bearing, and a driven flange which is coupled to the rotatable drum. Auxiliary bearings are provided between the first and second flanges. A removable locking element is provided to rigidly lock the drive and driven flanges together when the primary bearing is rotatably supporting the end of the drum.Type: GrantFiled: November 18, 1992Date of Patent: September 20, 1994Inventors: Dale F. Gordon, William B. Benson
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Patent number: 5346365Abstract: In a gas turbine, the exhaust gas casing (5) consists of a ring-shaped hub-end inner part (6) and a ring-shaped outer part (7), which parts bound a diffuser (9) and are provided with a horizontal split plane. The exhaust gas casing merges into an exhaust gas duct, whose boundary walls likewise consist of a ring-shaped hub-end inner part (16) and a ring-shaped outer part (17). The split locations between the exhaust gas casing and the exhaust gas duct are configured as flange connections (7A, 17A and 6A, 16A respectively). The flanges (7A, 17A and 6A and 16A respectively) at the split locations have a conically extending contact surface.Type: GrantFiled: September 1, 1993Date of Patent: September 13, 1994Assignee: Asea Brown Boveri Ltd.Inventor: Kamil Matyscak
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Patent number: 5289733Abstract: The invention is an improvement in a gear assembly having a gear segment attached to a spider. The improvement comprises a pair of spaced spider webs and a segment-attached mounting member received between the webs. The mounting member has a pair of spaced plates, one plate against each web. Each of a group of tube-like generally cylindrical segment coupling members extends between a particular web and its adjacent plate while each of another group of coupling members extends between the other web and its adjacent plate. The coupling members of a group are in opposed relationship to corresponding coupling members of another group. A bolt-like retaining member extends through each pair of opposed coupling members (with clearance therebetween) and prevents such members "working" out of position.Type: GrantFiled: December 3, 1992Date of Patent: March 1, 1994Assignee: Harnischfeger CorporationInventor: Harvey J. Kallenberger
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Patent number: 5263997Abstract: A plate for spreading bolt loading around the horizontal joint flanges of a turbomachine, such as a steam turbine, is provided. The plate is contoured so that its surface area substantially matches that of the surface of the steam turbine flange against which the compressive load associated with the joint bolt preloading is applied. The plate is disposed between the flange and the nuts on the joint bolts and is made from a high yield strength material so that the locally high stresses under the nuts do not cause creeping or yielding of the plate. The plate serves to distribute the compressive joint loading around the entire surface of the flange, thereby eliminating the locally high compressive stresses that can cause creep and yielding in the flange. Spherical counter bores are machined in the plate bolt holes and spherical washers are installed between the plate and the nuts so that misalignment of bolt holes does not cause the nuts to impose bending forces on the bolts.Type: GrantFiled: March 27, 1992Date of Patent: November 23, 1993Assignee: Westinghouse Electric Corp.Inventors: David M. Parker, John A. Moreci
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Patent number: 5123772Abstract: A threaded hub and shaft connection includes a first hub threaded onto a first section of the shaft using a thread shape having a working face rise angle of from 7 to 25 degrees. Preferably a second hub is threaded onto a second section of the shaft inboard of the first hub, and the threads in the second hub and second shaft section also have a working face rise angle of from 7 to 25 degrees. Bolts or set screws engage both of their hubs in such manner as to exert axial force on at least the first hub tending to move the first hub relative to the shaft in the working face rise direction of the thread carrying the first hub.Type: GrantFiled: April 15, 1991Date of Patent: June 23, 1992Assignee: Coupling Corporation of AmericaInventor: J. Hilbert Anderson
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Patent number: 5074697Abstract: A releasable connector for interconnecting a first part and a second part, at least one of the parts being subjected to high stresses in particular of vibratory origin and of thermal origin, the connector comprising a sealing ring compressed between the two parts, a main lip formed on the first part to be interconnected, and at least one connection part for exerting a retaining action on the main lip relative to the second part to be interconnected and for compressing the sealing ring. The connector further includes an intermediate ring provided with a flange and constituted by at least two lengths, the intermediate ring being interposed between the main lip and the connection part and being made of a material of low thermal conductivity.Type: GrantFiled: December 8, 1989Date of Patent: December 24, 1991Assignee: Societe Europeenne de PropulsionInventors: Guy Blanpain, Gilles De Braeckelaer, Jean-Francois Bonniec
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Patent number: 5044771Abstract: A pyrometer has a lock nut that engages a threaded sighting tube. The lock nut has a flange with a circle of thirteen apertures. A second similar flange is mounted on the body of the pyrometer which is restrained from rotation by splines which engage splines in the sighting tube. The second flange has a circle of only twelve apertures which is concentric with the circle of apertures on the first flange. The two flanges are locked together and the pyrometer is thereby locked in the sighting tube by means of a split pin pushed through aligned apertures. The different number of apertures in the flanges gives a number of locking positions that exceeds the number of apertures.Type: GrantFiled: September 26, 1990Date of Patent: September 3, 1991Assignee: Smiths Industries Public Limited CompanyInventor: Ronald A. Masom
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Patent number: 4988231Abstract: An bushing for securing machine elements. the two-piece bushing includes a body member having a central bore for receiving a shaft or the like and a flange which is rotatable with respect to the bore. The flange includes a plurality of bores for receiving securing means for securing the bushing to a hub or the like and a ridge portion for engaging at least a portion of the body member such that, when the securing means are tightened, the bushing and hub are drawn together. In the preferred embodiment, the outer surface of the end of the body member and the inner surface of the flange have complementary grooves therein for receiving a plurality of steel balls. When the balls are inserted within the groove, a ridge is formed which locks the flange and body member together in the axial direction. In addition, the bushing may include a ridge portion between the body member and the flange for preventing axial movement in at least one direction.Type: GrantFiled: July 21, 1989Date of Patent: January 29, 1991Assignee: Industrial Fabricators Machine, Inc.Inventor: Delmer E. Pettit
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Patent number: 4946305Abstract: A coupling for joining together pairs of shafts set on the same line but not co-axial, comprising a pair of hubs keyed onto the shafts and interconnected by an outer bell-like device and providing, as joining elements between the couplings and the bell, a plurality of rounded rollers.Type: GrantFiled: March 24, 1989Date of Patent: August 7, 1990Assignee: Nuova Sircop Engineering S.r.l.Inventor: Silvano Dell'Acqua
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Patent number: 4943686Abstract: A sealing frame arrangement is disclosed for creating a hermetic seal between two components or bodies such as a connector and heat sink module of an integrated circuit package. The frame members are configured to fit together along facing surfaces and to be joined to the two bodies along the inner edge of their outside (non-facing) surfaces. The sealing arrangement is completed by a third seal formed along the outer facing edge of the frames. The frames extend a sufficient distance beyond the two components to permit severing the frames inside the third seal and resealing. Preferably, the frames are of sufficient width to provide a multiplicity of sealing regions so that the third seal can be broken and resealed a number of times. The seal frames may be of stepped or corrugated configuration in which the individual seals are formed along the mating steps.Type: GrantFiled: April 18, 1988Date of Patent: July 24, 1990Inventor: Andrzej Kucharek
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Patent number: 4763470Abstract: A spring collar coupling (10) is provided for joining opposing fluid conduits. Basically, the spring collar coupling comprises a spring collar (20) in cooperative engagement with a first and second flange member (40, 60) functionally joined by the application of a coaxial force, the insertion of a bayonet locking ring (70) and release of the pressure force to effect a coupling of the aforesaid components.Type: GrantFiled: January 30, 1987Date of Patent: August 16, 1988Assignee: Rockwell International CorporationInventor: Jeffrey K. Brown
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Patent number: 4717280Abstract: A retaining and locking clamp, mounted onto a first apparatus, for retaining and locking a second apparatus to the first apparatus. The first apparatus has a plate which in turn includes an aperture. The clamp comprises an inner rod that has a first end portion and a second end portion, the second end portion being adapted to be received within the aperture of the first apparatus plate so as to mount the inner rod to the first apparatus. The clamp also includes an outer sleeve that is rotatably mounted onto the inner rod, the outer sleeve has a retaining and locking flange and a surface. The clamp further comprises a turn knob that is rotatably mounted onto the inner rod, the turn knob has a surface that is adapted to frictionally engage the outer sleeve surface, whereby rotating the turn knob causes the turn knob surface to frictionally engage the outer sleeve surface so as to permit the outer sleeve flange to retain the second apparatus.Type: GrantFiled: March 20, 1986Date of Patent: January 5, 1988Assignee: Hewlett-Packard CompanyInventors: George E. Baker, Robert F. Schaefer
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Patent number: 4641985Abstract: A device for temporary edge to edge securement in space of two parts along a contacting surface comprising:a plurality of retaining members distributed in pairs on either side of such contacting surface on each of said respective parts and a plurality of temporary connection members adapted to maintain them coupled to one another, with the rataining members in each pair being provided with complementary raised members for retainment thereof one relative to the other according to a longitudinal direction parallel to said contacting surface in at least one direction, said retaining members in each pair forming conjointly a bulging tenon oriented longitudinally engaging a narrowing groove formed in a rider constituting a temporary connection member for such pair of retaining members, andan automatic release mechanism comprising a coordination element connected to the plurality of temporary connection members and adapted to disengage the latter relative to said plurality of retaining members under the action of aType: GrantFiled: May 31, 1985Date of Patent: February 10, 1987Assignee: Aerospatiale Societe Nationale IndustrielleInventors: Max Bard, Gerard Sibilo, Georges Marello, Daniel Viale, Michel Louis
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Patent number: 4638273Abstract: A waveguide joint with flanges bonded to a waveguide section. Each flange is divided into two pieces with internal knurling and corner projections to bite into the external waveguide corners. The flange pieces are pressed on while the bonding adhesive is cured.Type: GrantFiled: July 16, 1984Date of Patent: January 20, 1987Assignee: ITT CorporationInventors: John D. Foglesonger, David M. Vranson
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Patent number: 4632590Abstract: A connecting structure for connecting a ceramic shaft to a metallic shaft comprises an arc body having a tapered portion in cross section, the arc body being fitted around a ceramic shaft, a member inserted by the ceramic shaft and placed adjacent the arc body at its one side, a metallic shaft placed adjacent the arc body at its other side, at least one of the member inserted by the ceramic shaft and the metallic shaft being in contact with the tapered portion and a fastening means for fastening the member and the metallic shaft to clamp the arc body.Type: GrantFiled: October 10, 1984Date of Patent: December 30, 1986Assignee: Asahi Glass Company Ltd.Inventor: Yoshihiro Tsuchimoto
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Patent number: 4632634Abstract: A system for fixing nozzles to a power turbine stator casing, in which each nozzle sector is locked to the respective shroud by means of a key which has its two diverging vertical flanges inserted into a radial dovetail guide in the front surface of the shroud, where it is held in position by an elastic element or spring acting between the key and the inner wall of the guide, its lower vertical nose or beak acting as a shoulder abutment for a radial fork of the nozzle sector, which is mounted over, and kept centered by, the two projecting sidepieces of said key, which also has a projection at its upper end. Each shroud is locked to the stator casing by an insertion-fit between the uncinated edges of a cavity in the outer peripheral surface of the shroud and the corresponding uncinated edges of a circumferential cavity in the stator casing, the insertion being secured by a leaf spring acting between the mutually facing, uncinated edge-free walls of the two said cavities.Type: GrantFiled: September 26, 1984Date of Patent: December 30, 1986Assignee: Nuova Pignone S.p.A.Inventors: Costantino Vinciguerra, Leonardo Arrighi
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Patent number: 4529232Abstract: A flange connection for connection in series hollow cylinder barrels forming a screw press. The cylinder barrel is formed with a groove adjacent one end thereof, and radially reduced, stepped portions of flange ring halves are positioned in the groove. Bore holes are formed at the abutment line between the flange ring halves and the external surface of the barrel, and pins are inserted in the bore holes. In this manner, radial, axial and rotative movement of the ring half is prevented, without the need for welding or otherwise permanently securing the connection.Type: GrantFiled: August 23, 1983Date of Patent: July 16, 1985Assignee: Hermann Berstorff Maschinenbau GmbHInventors: Hans-Joachim Schaeffer, Gerhard Syrbius
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Patent number: 4515495Abstract: A linking arrangement for a shaft and a moving part, such as a fly-wheel, rotating about the same axis includes two coaxial rims fastened to the shaft and moving part, respectively, with radial notches situated on opposed surfaces of the rims that are fixed in contact with one another. The notches provide housings for a set of cylindrical pins so that rotary motion can be transmitted between the shaft and the moving part. Stress-relieving grooves are provided at the bottom portions of the notches so as to permit constant contact between the rims and between the notches and the pins regardless of differential expansion of components of the linking arrangement. A principal application of the linking arrangement is to connect a shaft to a fly-wheel or a shaft to a rotary pump impeller.Type: GrantFiled: September 27, 1982Date of Patent: May 7, 1985Assignee: Jeumont-Schneider CorporationInventor: Jean Trouillet
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Patent number: 4496262Abstract: A linking means is disclosed for releasably connecting and quickly disconnecting two relatively discrete members in longitudinally aligned load bearing or load transmitting relationship to each other. The discrete members are connected by the coaction of hook-like flanges strategically disposed upon one member with angularly disposed retainer flanges disposed upon the other discrete member and the containment of a portion of one member between spaced outreaching flange members integrally formed upon said second member while a portion of the confronting edges of both members engage.By disengaging the confronting edges of the member and vertically moving the first member relative to said second member, a quick disconnect is achieved.Type: GrantFiled: June 1, 1982Date of Patent: January 29, 1985Inventor: George G. Sangster
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Patent number: 4416575Abstract: A union nut, for cooperation with a first tube having an external thread and a second tube having a radially outwardly projecting flange, has an annular body with an internal thread to engage with the external thread of the first tube, the body being made of a synthetic resinous plastics materials of adequate strength to resist forces exerted by tightening of the nut, and a tool-engaging abutment element secured releasably on the body and at least partially projecting radially inwardly beyond the internal thread of the body so as to be able to abut axially against a flange on the other tube. Tightening of the nut onto the threaded tube draws the two tubes axially together. The abutment element is made of a material, e.g. stainless steel, selected to have adequate strength to resist bending or fracture under the axial forces applied, and to resist damage by the application of a tool to the nut.Type: GrantFiled: September 17, 1981Date of Patent: November 22, 1983Assignee: Quinn Engineers Ltd.Inventor: Barry McCarthy
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Patent number: 4407602Abstract: A coupling between a prime mover and a dynamoelectric machine should include electrical insulation between the connected shafts so as to preclude the transmission of eddy currents between the dynamoelectric machine to the prime mover shaft. This insulation may be provided at the radial interface between coupling members. However, it has been found that the torque carrying capability of a coupling may be enhanced by providing a circumferential electrical insulation between radially inner and outer hubs which comprise the coupling member on the dynamoelectric machine side of the coupling.Type: GrantFiled: January 29, 1982Date of Patent: October 4, 1983Assignee: General Electric CompanyInventor: Vincent G. Terry, Jr.
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Patent number: 4266809Abstract: An improved float pad mounting is disclosed for releasably connecting the float pad to an outrigger lift jack shaft. The lift jack can be activated to move the shaft between a retracted position for outrigger travel and extended positions grounding the float pad for stabilized outrigger support. The float pad has a base of large area and a central hub upstanding from the base. Cooperating hemispherical surfaces are formed between the shaft and the hub which become engaged in the extended positions to transmit the outrigger load to the float pad base. An annular collar surrounds the shaft, and a pin extended through aligned openings in the collar and shaft secures the collar to the shaft at a location slightly above the load transmitting surface. Two closed links are loosely connected to the collar at 180.degree. spacings around the center axis of the shaft, and two lugs are formed on the float pad hub at like 180.degree. spacings around said hub.Type: GrantFiled: December 26, 1978Date of Patent: May 12, 1981Assignee: Burro-Badger CorporationInventor: James G. Wuerflein
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Patent number: 4263022Abstract: An electrostatic filter having a plurality of adjacent precipitating or separating fields in a box-shaped housing, each field being defined between at least one collector electrode and at least one corona-discharge electrode. A rapper arrangement is provided in the housing and comprises respective whipping or tumbling hammers which strike against anvils on the holders of the collector and/or corona discharge electrodes. According to the invention, the aligned hammer shafts for the corona discharge electrodes of adjacent separating fields are interconnected by insulating couplings and have a common drive.Type: GrantFiled: September 11, 1979Date of Patent: April 21, 1981Assignee: Apparatebau Rothemuhle Brandt & KritzlerInventors: Joachim Brandt, Werner Kantelhardt
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Patent number: 4239412Abstract: Connector means are disclosed for connecting together two shaft members in coaxial relationship and in preselected angular orientation with respect to each other. The connector means includes a locking bracket which is secured to one end of the first of the shaft members and a receiver which is secured, by way of an adapter, to the end of the second shaft member. The receiver includes a chamber open at its upper end for slidingly receiving the locking bracket. Both the locking bracket and the receiver have radial extensions which extend in the same radial direction relative to the axis of the coaxial shaft members. Supported on the extension of the locking bracket is a housing containing a spring-loaded pop pin having a nose portion adapted to pass through a hole in the locking-bracket extension and into a hole in the receiver extension, thereby to lock the bracket in the receiver. The pop pin is quickly retractable to unlocked position by a cam manually controlled by a lever.Type: GrantFiled: February 16, 1979Date of Patent: December 16, 1980Assignee: Spectrum X-Ray CorporationInventor: William F. Hogan
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Patent number: 4211192Abstract: The camshaft is constructed in portions each of which has an integral flange at one end and a releaseably secured discoid member at the other end. The flange of one shaft portion is secured to the discoid member of an adjacent shaft portion by means of screws. Each shaft portion has a plurality of cams shrink fitted thereon.Type: GrantFiled: December 1, 1977Date of Patent: July 8, 1980Assignee: Sulzer Brothers Ltd.Inventors: Peter Baumgartner, Robert Kuhne
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Patent number: 4160472Abstract: Apparatus is provided for splitting wood and specifically logs. The apparatus includes a conical splitting device which is attached to a vehicle wheel hub and is rotated as the wheel is driven. A separate mounting plate attaches the splitting device to the wheel hub which enables one splitting device to be mounted on a variety of vehicle wheel hubs by the use of a variety of mounting plates. The splitting device itself has a spirally-grooved cone with a truncated conical portion behind the cone to prevent the possibility of logs riding up the device and damaging the wheel hub or adjacent portions of the vehicle.Type: GrantFiled: July 25, 1977Date of Patent: July 10, 1979Assignee: Arnold Industries, Inc.Inventor: George H. Blackstone
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Patent number: 4134699Abstract: A coupling for shafts and the like, comprising a sleeve having a passage adapted to receive the end portions of two aligned shafts, an outer circumferential surface having two axially spaced sections which conically diverge towards each other, and a radial flange intermediate the sections; a pair of pressure rings each surrounding one of the sections and having a conically tapering inner circumferential surface complementary to the respectively surrounded section; and bolts connecting the pressure rings with the flange and operative for pulling the pressure rings axially towards each other and towards the flange to thereby compress the sleeve radially inwardly into frictional engagement with shaft end portions located in the passage.Type: GrantFiled: March 16, 1977Date of Patent: January 16, 1979Assignee: Ringfeder GmbHInventors: Horst-Dieter Schafer, Paul Loosen, Ulrich Kloren, Hans-Martin Thiele
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Patent number: 4120175Abstract: A flexible shaft coupling wherein the flange of at least one of the shafts is flexible and its marginal portion is separably fastened to the marginal portion of the other flange. The flanges surround thrust transmitting elements which are urged against each other as a result of deformation of the flexible flange in response to fastening to the other flange. The flexible flange may be integral with or it may be separably fastened to the shank of the respective shaft. The flexibility of the coupling is enhanced if the flexible flange is provided with or mounted between knife edges which permit such flange to snap over in response to tilting of one shaft with respect to the other shaft and/or vice versa. The thrust transmitting elements may be integral with the respective shafts or they may constitute removable inserts. One of the thrust transmitting elements has a convex face which bears against a flat face of the other element so that the elements are in mere point contact with each other.Type: GrantFiled: September 16, 1976Date of Patent: October 17, 1978Assignee: Klein, Schanzlin & Becker AktiengesellschaftInventor: Robert Dernedde
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Patent number: 4083639Abstract: A coupling member is shrink fitted onto the end of a dynamoelectric machine shaft and keyed thereto with a plurality of hollow keys of circular cross section which distort if excessive torque is applied to the coupling, reducing the risk of coupling failure. This coupling exhibits the properties of high strength and low weight which eliminates lateral shaft resonance at operating speeds.Type: GrantFiled: December 30, 1976Date of Patent: April 11, 1978Assignee: General Electric CompanyInventor: Vincent G. Terry
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Patent number: 4037980Abstract: Locking device locking the suspension nut of a driven shaft from rotation relative to the shaft, upon reversal in the direction of rotation of the shaft or such vibration as would loosen an ordinary nut. The locking device is particularly adapted for cantilevered shaft vertical pumps in which the shaft and pump impeller on the end of the shaft are susceptible to vibration. The locking device includes a pump coupling including a motor shaft coupling part and a pump shaft coupling part detachably secured to the motor shaft coupling part. A nut part having a cylindrical periphery is threaded on the pump shaft and recessed within the pump shaft coupling part, to suspend the shaft from the pump shaft coupling part. The full weight of the pump shaft, coupling and impeller, including the hydraulic thrust, is borne by the threaded connection between the pump shaft and the coupling nut. The coupling nut is tightened by a spanner wrench having projections fitting into drilled holes in the coupling nut.Type: GrantFiled: December 24, 1975Date of Patent: July 26, 1977Inventor: Walter D. Haentjens
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Patent number: 3953981Abstract: A concrete pile joint to be used for joining piles by means of complementary joint members, one of which is fastened to the end of a first pile and the other to the end of a second pile. Each joint member has male and female members constituted of rib portions and branches protruding on a support surface of each joint member. By assembling the joint the rib portions are received within the branches and lock pins inserted into coaxial through holes in both the rib portions and the branches for securing each pair of male and female member.Type: GrantFiled: May 28, 1974Date of Patent: May 4, 1976Assignee: Parca-Norrahammar ABInventors: Bengt Axelsson, Gunnar Albert Axgarde