Abstract: An adjustable wheel assembly which facilitates the positioning of a wheel on an axle. The wheel assembly includes an elongated axle having a rack and a keyway, a wheel hub, and two pairs of arc-shaped wedges positioned between the axle and the wheel hub. Two of the four arc-shaped wedges are inserted into a tapered bore on one side of the wheel hub and the remaining two wedges are inserted into a second tapered bore on the opposite side of the wheel hub. Each of the four arc-shaped wedges further contains a radial flange with bolt holes therethrough so that each wedge can be bolted to the wheel hub. In addition, one of the wedges contains a radial opening housing pinion gear which meshes with the rack on the axle so as to axially move the wheel hub along the axle. The wheel assembly also contains a pair of jackscrews which are used to force two of the oppositely aligned wedges axially apart thereby allowing the wheel hub to be released from the axle.

Abstract: Means to mount an element to be powered on a drive shaft are shown. The eent to be powered fits against a shoulder on the shaft. A retainer ring is next slipped onto the shaft against the element, and a snap ring is put in place in a groove in the shaft. Three plugs in the retainer ring are screwed against the element to clamp the assembly longitudinally between the shoulder and the snap ring.

Abstract: A coupling between a roll of a heavy rolling mill and a cardan shaft, wherein the roll and a connecting member are joined by a mortise-and-tenon joint with the roll having a projection and the connecting member having a recess to receive said projection, the joint being such as to prevent relative rotation. The leading end of the projection and the base of the recess have respectively a pair of mutually corresponding conical surfaces which are coaxial with the axis of the projection and are urged into engagement in order to align the axes of the roll and the connecting member.In order to achieve rigid coupling of the roll and the connecting member, there is provided a split ring which in unmounted condition is axially movable along the said projection and which is radially compressible by closure of the split or splits to grip the said projection.

Abstract: A linear torque and thrust transmitting wedge bushing (10, 100) for axially and rotationally securing a part (13, 120) to a circular cross-section shaft (11, 122) is positioned over the shaft within a circular cross-section opening of the part. The bushing includes inner and outer wedge rings (12 and 14; 106 and 108) concentrically disposed relative to each other and being radially expandable and contractible. The outer wedge ring has an outer axially straight surface (20), for engaging the inner surface defining the opening of the part, and the inner wedge ring has an inner axially straight surface (22) for engaging the outer surface of the shaft, characterized in that the wedge rings have engaging non-slip surfaces (16 and 18; 102 and 104) that are axially inclined at the same low angle of less than 10.degree.

Abstract: A luggage carrier intended to be attached over the front wheel of a bicycle contains an attachment device serving for the attachment of the luggage carrier at the steering fork head. To improve the torsional resistance of the luggage carrier and to be able to secure such luggage carrier also at the steering fork heads of existing vehicles without the need to disassemble any parts, the attachment device comprises two caps or hood members intended to engage about both shoulders of the steering fork head. Each of these caps can be fixedly clamped by means of a preferably wedge-shaped clamping body at the related shoulder of the steering fork head.

Abstract: The invention relates to a device for securing an expandable hub in a hole, particularly, but not exclusively, the hub of a cable drum wheel in the center hole in the side of a cable drum, the hub having projecting in an axial direction a part which is intended to be inserted into said hole and expanded there to bear against the walls of the hole. The projecting part consists of a number of radially movable tightening jaws, which are capable of being actuated by a bracing block. This bracing block has a number of slots corresponding to the number of jaws, said slots having an inclined guide surface and this guide surface acts upon a corresponding guide surface on one end of the interacting jaw in conjunction with the radial displacement of the jaw when the block is operated, both the jaws and the block remaining unrotatable when operated.

Abstract: A flanged connection for shafts or tubes includes abutting flanges at adjoining ends of the shafts or tubes and also includes aligned bores in the flanges. Fasteners extend through the bores in directions parallel to the axes of the shafts or tubes. The fasteners are radially expandable into clamped conditions in which they abut and exert radial pressure against the bores in the flanges. This eliminates the play between the two adjoining flanges, which play stems from necessary initial clearances between the fasteners and bores to allow for insertion of the fasteners into the bores.

Abstract: A rigid coupling, suitable for turbomachines, includes friction flanges for transferring torque from one shaft to another, bolts for axially coupling the friction flanges together, and shearing bushings which encompass these bolts and which prevent relative radial motion between the flanges. One-half of the outer sidewall surface of each such shearing bushing is cylindrical, while the other half of the outer sidewall surface is conical. The cylindrical half of each shearing bushing is larger than the bore which accommodates it in one of the flanges, and is inserted by means of a shrink fit. The conical half of the shearing bushing mates with a bore in the other flange which has the same conical shape. Each shearing bushing may also have grooves cut into its frontal surfaces to form collars which flex during use.

Abstract: A handle stem fixing device for a bicycle is described in which a rotary control is provided at the head of a bolt, the head being larger in diameter than the bolt stud or alternatively having a flange, and a socket is provided at a hollow handle stem, into which the head is lodged and a retainer is provided, whereby the retainer substantially blocks the bolt's axial movement and the bolt is screwed to which is forced to be axially movable.

Abstract: Clamping assemblies are disclosed for clamping together two members which fit concentrically one within the other, such as a hub and shaft arrangement. In one type of construction there is an inner taper ring, an intermediate taper ring and an outer taper ring each having one or more taper surfaces. Altogether, there are at least two pairs of interacting taper surfaces. The taper angle of one of the pairs of surfaces is within a range of angles in which self-locking takes place while the taper angle of the other of the pairs of taper surfaces is greater than the angle at which self-locking takes place. A plurality of axially oriented clamping bolts axially clamp the intermediate taper ring against the inner and outer taper rings, and the vertexes of both taper angles of the intermediate taper ring are both located on the same side of the intermediate taper ring. Also, the clamping bolts grip that one of the taper rings having the taper angle located within the self-locking range.

Abstract: A stabilizer sleeve, or other sleeve, to be releasably mounted on a drill collar for centering a drill string in a well bore, includes an outer stabilizer sleeve to be mounted on the cylindrical periphery of the drill collar and having an internally threaded bore, the threads of which have conical roots, receiving an externally threaded yieldable sleeve member placed over the drill collar, the crests of the external threads also being conical, rotation of the yieldable member threading it into the stabilizer sleeve and effecting its contraction until its internal surface contacts the periphery of the drill collar, further rotation and tightening of the sleeve member in the stabilizer sleeve compressing the sleeve member against the drill collar periphery, with the crests bearing against the root portions of the internal sleeve threads to secure the sleeve frictionally in position on the drill collar.

Abstract: To permit accurate centering by means of compression rings which are pressed against conical surfaces of a tubular element inserted in the hub, and a sleeve with conical surfaces placed on the shaft, the compression rings are formed with axial centering ring extensions which, at their inner and outer surfaces engaging the hub, and the shaft, respectively, are bowed or curved in cross-section to be, for example, at least approximately part-spherical. Sequential tightening of bolts to draw the compression rings together and the respective conical surfaces over each other thus will not result in misalignment of the compression rings, or tilted or slanted bindings thereof with respect to the hub, or shaft, respectively, but insure accurate positioning of the compression rings, with the centering extensions around the shaft and within the hub.

Abstract: Apparatus for securing a metal hoop onto a metal rim is disclosed which apparatus includes two tightening collars integral with the rim, the collars and the metal hoop having conical shoulders and conical bores, each with the same angle of inclination, the conical shoulders being deformable by the action of the conical bores upon tightening the collars against the hoop so that no play remains between the hoop and the rim.

Abstract: A roll device includes a roll shaft and at least one roll ring mounted on the roll shaft. A lock means is securable to the roll shaft. A centering element is disposed between the roll ring and the roll shaft to center the roll ring. A first resilient element is axially interposed between the lock means and the centering element. A second resilient element is axially interposed between the lock means and the roll ring. The lock means applies axial force to the first and second resilient elements to position the centering element relative to the roll ring and roll shaft, and clamp the roll ring to the roll shaft for common rotation therewith. The spring rates of the first resilient element can be made less than that of the second resilient element to regulate the relative amount of axial forces applied to these elements.

Abstract: In an adjustable telescoping power take-off shaft an inner shaft extends into splined engagement with an outer shaft. An adapter sleeve encloses an axially extending part of the outer shaft and a locking assembly, including a clamp nut threaded onto the sleeve and a retainer ring located within the nut, locks the inner and outer shafts in position after the length adjustment is made.

Abstract: An arrangement is provided for securing together two hollow members of a framework of a bicycle, wherein one of the members passes through an aperture in the other. A pair of split collets surround the one member and extend into the aperture from opposite sides thereof. The one member has a tube secured to its outer surface in abutment with one of the collets, and this member is threaded and receives a nut which exerts pressure on the other collet. Tightening of the nut on the threaded member urges the collets into the aperture and secures the two members together. The one hollow member may have mounted therein bearings and a shaft of a pedal assembly of the bicycle.

Abstract: A farm machine coupling utilizes a wedge having an internally threaded bore formed therein for accommodating a bolt threadedly coupled in a coupling member of a shank affixed to a farm machine. When the coupling end of an agricultural attachment for performing an agricultural task is positioned on the free end of the shank and the wedge is positioned in the rectangular sleeve type coupling end next-adjacent the shank and the bolt coupled in the coupling member is threadedly coupled in the wedge, the attachment is removably tightenable on the shank via the bolt and the wedge.

Abstract: A swivel joint comprises a journal fitted in a hole. The journal is conical and axially formlocked in the hole. A working chamber is arranged behind one of the mantle surfaces of the hole and the journal. The chamber has an integral flexible wall defining one of said surfaces. When hydraulic pressure is applied to the chamber, the flexible wall expands the journal is centered in the hole and locked against rotation, and the journal end engages the hole bottom.

Abstract: A shear pin assembly in a shaft coupling is disclosed in which an elongated, circular cylindrical shear pin having a central groove is held at its ends in split, tapered bushings received in tapered outer bushings press-fitted into bores in flanges of the two coupling halves. A loading bolt is threaded in each end of the shear pin and a head of the bolt bears against a loading plate which in turn is seated against the split inner bushing to force the inner bushing into place to rigidly grip the ends of the shear pin.

Abstract: Apparatus for pulverizing coal including a bowl and a cooperating roller between which members the coal is pulverized. The grinding surface of the roller is made up of a removable sleeve which is securely held on the journal bearing housing by means of wedge lock rings located at each end of the sleeve. These wedge lock rings, along with the roller, can be easily assembled, and provide positive locking of the removable sleeve onto the journal bearing housing, even if there are slight irregularities on the tapered surfaces of the sleeve.

Abstract: A nut is provided for preloading a sleeve which is wedged between a tubular member and a shaft. The nut, which is threadedly received on the tubular member, has a resilient, radially inwardly extending portion to engage the end of the wedge sleeve. When the nut is tightened on the tubular member, the inwardly extending portion of the nut is deflected to produce a stress-created force on the wedge sleeve, continuously urging the wedge sleeve toward a tightening position between the tubular member and the shaft.

Abstract: A device, for use with a pulley having a substantially cylindrical outer surface with a first circumferential belt groove therein defining a first pitch diameter, for increasing the pitch diameter to a desired second pitch diameter. The device includes a pulley rim having a substantially cylindrical inner surface configured to be received around the pulley and a substantially cylindrical outer surface having a second circumferential belt groove therein defining the desired second pitch diameter. The pulley rim is releasably clamped concentrically around the pulley by coaction with the first groove to mount same thereon thereby increasing the pitch diameter of the pulley to the second pitch diameter.

Abstract: An improved hub-locking device for conveyor pulleys including a spherically shaped collet having a centrally located bore for receiving a shaft and having an axially aligned slot extending through one side thereof permitting compression of the collet on the shaft, a hub attached to the end of the pulley and having an axially aligned tapered aperture for partially receiving the collet with the shaft therein, a clamping ring having a tapered aperture for partially fitting over the collet and a plurality of bolts for passing through holes in the clamping ring, for threading into the hub and for drawing the clamping ring toward the hub compressing the collet therebetween, causing the collet to compress and engage the shaft, the hub and the clamping ring.

Abstract: Disclosed is a shaft fastening assembly comprising a primary tapered ring having a cylindrical circumferential surface and at least one conical surface, with the primary tapered ring substantially surrounding a shaft; at least one secondary tapered ring having a cylindrical circumferential surface and a conical surface cooperating with the conical surface of the primary tapered ring; a plurality of tension bolts for tightening together the conical surfaces of the primary tapered ring and the secondary tapered ring arranged in a first circular plane surrounding the shaft; and a plurality of release bolts for releasing the conical surfaces of the primary tapered ring and secondary tapered ring arranged in a second circular plane surrounding the shaft with the first and second circular plane being located at different radial distances from the shaft to allow for the use of more tension bolts than previously possible.

Abstract: A releasable stabilizer is provided for adjustable positioning along a drill string. The stabilizer includes a body positioned around the drill string with a threaded section on each end; a clamping wedge used at each end with an inwardly facing surface to grip the drill string; and a threaded end cap for forcing the wedge against the drill string by screwing the end cap onto the body to clamp the assembly onto the drill string.

Abstract: Anchoring arrangements for structures such as offshore towers. Wedges which fit down into spaces defined by downwardly converging surfaces fixed to the structure and to an anchor member, respectively, are held in frictional locking engagement by means of bias weights. Two sets of wedge type interlocks are provided in longitudinally displaced relationship and are arranged in reverse order so that downward bias forces on the wedges serves to provide locking against relative movement in opposite longitudinal directions.

Abstract: Disclosed is a thrust retaining device for positive axial securing of a part on a smooth shaft or within a smooth bore without shoulders, threads, grooves or holes. The thrust retaining device for use on a shaft includes a contractible inner collar ring for retaining thrust by having one end positioned against the part to be secured, an outer collar ring to be placed over the inner collar ring for contracting it, and loading screw means attached to the outer ring for applying axial force to the outer ring. The inner ring has an inner surface for gripping the shaft when contracted and an outer surface which is axially inclined at a shallow angle and matches an axially inclined inner surface of the outer ring. At least one of the axially inclined surfaces of the inner ring and outer ring is coated with a stable anti-friction material preventing metal-to-metal contact at static pressure.

Abstract: The plunger tube of the handle-bar stem adapted to be blocked in the fork tube of the vehicle is provided at its end with at least one inclined outer face. A nut adapted to cooperate with the inclined face has the same number of inclined faces which are inclined in the opposite direction. An expanding member is tightened against each face of the tube and against the corresponding face of the nut and urged outwardly by the translation of the nut axially of the plunger tube so that the nut bears against the fork tube and blocks the two tubes.

Abstract: A coupling unit for coupling a shaft to a surrounding hub has an inner ring which surrounds the shaft and is in turn surrounded by an outer ring. The juxtaposed surfaces of the two rings define with one another two wedge-shaped annular gaps which taper towards each other axially of the rings. Tension members are inserted into these gaps and both extend through the tension members so as to draw them axially together in order to force the rings against the shaft and the hub, respectively. An abutment ring is located between the inner and outer rings and has circumferentially spaced bores some of which are smooth and some of which are tapped. By cooperation of the bolts and the abutment ring the tension members can be forced out of the respective gaps when the connection between shaft and hub is to be released.

Abstract: A pin-type connector for interconnecting a pair of members having nominally aligned through-bores without requiring true alignment of the bores including a cylindrical cup-shaped bushing with a discontinuous upstanding wall having a frusto-conical interior surface and a fastener-receiving bore in the bottom of the bushing, the bushing at least partially receiving a pin whose exterior surface is frusto-conical and engages the interior surface of the bushing, with a fastening means being received by the pin through a bore therein. The pin is drawn into the bushing by the fastening means, thereby expanding the wall of the bushing to frictionally engage a bore of one of the members. At least one of the frusto-conical surfaces is slightly eccentric with respect to the longitudinal axis of the element upon which it is formed.

Abstract: A hinge pin including two substantially identical sections which when assembled form a cylindrical sleeve. Each section has a first end having a cross-section greater than a semi-circle which tapers along its length to a second end having a cross-section less than a semi-circle. When the two sections are joined together, they form a cylindrical sleeve for use as a readily removable hinge pin. Ready removal is effectuated by sliding one section away from the other along their tapered lengths, the taper enabling the average diameter of the sleeve to decrease as the two sections are so slid apart.

Abstract: A bicycle handlebar stem is made of two separate parts, a tubular shank and a gooseneck. This eliminates or substantially reduces long drilling operation for the stem and it simplifies the forging of the gooseneck. The gooseneck is shaped for forging thereof in a manner such that the meeting of the forging dies does not occur across the top of the stem, and the forging operation can forge identifying insignia on the stem top and/or form a recess of receiving an identification plate. Destruction of the indicia on the plate in the case of a stolen bicycle is easily detected. In order to inhibit commerce in such stolen bicycles the handlebar stem is mounted in the steering column in a manner that requires a special tool to remove it and to replace it by another.

Abstract: A tenon for mounting a lighting fixture to a support. The tenon has a cavity accessible through a removable cover, inside which a wiring splice can be made to join the wiring from the lighting fixture to other electrical circuitry wiring. The splice can be made and inspected at the tenon without removing the lighting fixture from the tenon or from the support. Means is also provided to mount the tenon to the support, and to mount the fixture to the tenon.

Abstract: In the embodiment shown, the coupling means comprises an annular wedge which is insertable between the stem and the cutterhead of a raise borer, the wedge being bolted to the cutterhead to effect contact pressure in order that rotary torque will be transmitted from the stem to the cutterhead. A thrust plate is secured to the lower end of the stem in engagement with a lowermost surface of the cutterhead. In addition, a friction locking assembly is used on an underlying or protected portion of the cutterhead to center and locate the stem relative thereto.

Abstract: A collar for axially clamping tools, spacers and the like on a shaft having a smooth portion and a threaded end portion includes an internally threaded attachment ring to fit on the threaded end of the shaft, an adjustment ring adjacent the members to be clamped and tightening screws threaded through the attachment ring and abutting the adjustment ring to axially urge the latter against the clamped members. The attachment and adjustment rings are interconnected by annular flexible connecting portions and an intermediate ring through which the screws freely pass. A second embodiment includes a second intermediate ring and additional connecting portion. A third embodiment includes an outer ring and clamping screws to urge the outer and attachment rings together to improve the grip of the collar on the threaded end of the shaft.

Abstract: A bearing assembly having a rolling contact bearing affixed to a housing, an outer race fixed to the housing and an inner race, wherein a driving member, the inner race and a driven member are clamped together by a through-bolt extending through the driving member, the inner bore of the inner race and the driven member. At least one end face of the inner race is provided with axially extending teeth. A stepped sleeve is placed between said one end face and the respective member at that one end face, the stepped sleeve having an axially extending projection and being deformable by engagement with the teeth for positive engagement therebetween. The respective member has a recess into which the projection extends, the stepped sleeve extending into and positively engaging the bore of the inner race.

Abstract: A bearing assembly having a rolling contact bearing with an outer race extending to and affixed to a housing, and an inner race having axially extending teeth on its end faces. A driving member engages one end face, a driven member engages the other end face, and a through-bolt extends through the inner bore of the inner race for clamping the driven member, inner race and driving member together. An auxiliary assembly sleeve is connected to one of the driving or driven members and fitted over the through-bolt, the sleeve being in friction-tight engagement with the inner bore of the inner race.

Abstract: An anchor fitting has flat surface pads with shoulders extending therefrom and a post portion extending along an axis substantially normal to the flat surfaces of the pads. A latching plunger is slidably mounted on the post portion for motion along the longitudinal axis thereof. The fitting is removably retained in a selected position along a slotted track having a plurality of notched portions separated by narrow neck portions formed by flanges with the shoulders of the pads in the track slots underneath the flanges and the latching plunger member seated in one of the notched portions of the track. A cam bar member is supported on the anchor fitting in an apertured portion thereof by means of an adjustment screw. This bar member is drawn against the walls of the apertured portion of the anchor fitting such that it drives against the surface of the track drawing the shoulders of the pads tightly against the walls of the track to provide a tight rattle-proof joinder between the fitting and the track.

Abstract: An inner annular member of the arrangement surrounds the shaft and has an outer circumferential face two sections of which conically taper in mutually opposite directions. The inner annular member is also provided with a radially outward extending collar intermediate these sections. A pair of outer annular members each surround one of the sections with clearance and have an exterior cylindrical surface and an interior surface having a taper opposite to that of the respective section to form therewith a wedge-shaped annular clearance. The outer annular members abut from opposite axial ends against the collar. Tension members are received in the respective clearance and are drawn by both or the like inwardly of the clearance so as to force the inner member against the shaft and to the outer members against the surrounding hub, thus coupling the hub and the shaft for joint movement.

Abstract: A radially deformable clamping device including a cylindrical body having a central bore, a pair of inwardly extending annular grooves near the ends of the body and a pair of annular grooves extending outwardy from the central bore and spaced inwardly of the first pair of grooves. The grooves define a central portion and flexible zones to permit the central portion to be radially deformed. A plurality of equally spaced concentric axial bores extend from one end face of the body through the central portion. Slots extend between the plurality of bores and the central bore in the central portion. The bushing can be applied around the mandrel having a shoulder and a threaded end with a nut, the body being axially compressed between the shoulder and nut to cause radial deformation. A pin can be provided in one of the bores to prevent rotation of the body. In another embodiment, the plurality of bores extend entirely through the body and receive screws or bolts to cause the axial compression.

Abstract: A hinge pin construction including a pin adapted to journal an arm or the like, an annular wedge member associated with one end of the pin, a collet receivable on the wedge member, a bolt extending through the collet to be threadably received in a bore in a pin, the bolt also being threadably received in the collet. The threads in the collet have a lesser pitch than the threads in the bore so as to provide a differential action to properly seat the collet on the wedge member with a minimum of friction.

Abstract: A shaft bearing retention means comprises a segmented ring having a conical inner surface which is placed about a large diameter shaft having a corresponding conical indentation about its periphery to receive the ring. The segments are retained in assembled position on the shaft by joining pins extended through interengaging lapped tongues on the ends of each segment and by attaching one or more flanged retaining rings thereto by screws or bolts. Additional clamping screws or bolts pass through the retaining ring and are threaded into the segments, projecting beyond the latter so as to bear against a thrust ring through which the shaft passes. The axially adjustable thrust ring engages a bearing assembly which is fixed against axial movement by a shoulder on the shaft. Axial force is produced against the bearing assembly by the clamping bolts due to wedging action of the mating conical surfaces on the shaft and the segmented ring.

Abstract: An adapter for installing a replacement drain valve in an existing drain comprises a cylindrical valve adapter insertable in the drain. The interior of the adapter is threaded, and the exterior is tapered upwardly. A similarly tapered split ring is disposed between the adapter and the drain. An externally threaded driving member is received in the adapter, and includes an outwardly extending flange which impinges on the upper end of the split ring. The drive member wedges the split ring between the drain and the adapter, securing the latter in the drain. The adapter includes a spider in the lower end thereof which receives and secures the replacement valve.

Abstract: A detachable coupling device has radially spaced outer and inner concentric rings mounted on a shaft. A pair of axially spaced clamping rings have surface portions which are partially received within the interior spaces formed by the circumferential surfaces of the outer and inner rings. Clamping screws draw the clamping rings together, causing the rings to thereby generate a radial clamping force on the shaft.

Abstract: For drivingly connecting the external cylindrical surface of an inner machine element to the internal cylindrical surface of an outer machine element, such as a shaft to a pulley, forward and rearward clamping rings are spaced axially apart from one another and have circumferentially spaced aligned bolt holes disposed parallel to the axis of their internal and external cylindrical surfaces. One ring has smooth bolt holes and the other ring has threaded bolt holes, these holes receiving threaded clamping bolts. Mounted in the space between the two clamping rings are pairs of alternately oppositely facing resilient coupling rings of substantially Z-shaped cross-section having bolt holes aligned with the clamping ring bolt holes. Each coupling ring consists of radially-spaced inner and outer annular rims connected at acute angles to the opposite ends of an annular web inclined at an oblique angle to the axis of the cylindrical outer and inner surfaces of these coupling rings.

Abstract: A device for releasably attaching a gas spring to the bottom of a chair comprises a cup shaped holding device having a tapered surface, a tapered gripping device and a bolt or the like for wedging the gripping device in the holding device against the gas spring.

Abstract: To decrease the cost of such a connection, and increase power transmission as well as decrease stresses on the shaft, conical surfaces formed of respective inner and outer clamping rings are so arranged that one of the conical surfaces has an engagement friction relationship which provides for self-binding, whereas the other conical surface does not have self-binding engagement friction; the difference in engagement friction can be obtained by changing the cone angles, or the surface characteristics of the engaging surfaces.

Abstract: A heat exchanger and mounting structure therefor for use in connection with incinerators, for example, the heat exchanger formed of a ceramic wheel with a central core and an annular portion with gas passages extending axially therethrough. The ceramic wheel is mounted at the central core with a mounting means which comprises first and second wedge members in abutting relationship with opposite sides of the core. Means bias the wedge members towards each other so that the core is resiliently held under compression between the two wedge members to eliminate tension stresses on the ceramic wheel due to thermal expansion differences between the ceramic wheel and the mounting structure therefor. The mounting structure includes a first shaft secured to the first wedge member and a second shaft, tubular in shape and concentrically mounted on the first shaft, the second shaft being secured to the second wedge member. The shafts are supported on the cool side of the heat exchanger wheel by a pair of bearings.

Abstract: To simplify manufacture of double conical hub-to-shaft connections and to improve centricity, a double conical centering ring is located intermediate the connection, formed with a cylindrical groove, so dimensioned that it will entirely receive a radially resilient ring, which ring can snap into a matching ring groove formed on a double conical surface, to entirely fill the groove and accept compressive forces without deformation of the conical surfaces adjacent the groove.

Abstract: To couple a hub having a connecting boss to a shaft, with improved centricity and torque transmission, the hub is formed with a ring groove in the end face leaving a protruding boss surrounding the shaft, in which ring groove a pair of concentric rings having matching continuous conical surfaces are inserted, the depth of the ring groove, and the rings themselves being so relatively dimensioned that, in loosely assembled condition, the inner surface of the outer ring is spaced from the axially facing surface of the ring groove by a pretermined distance which is taken up during tightening, the inner face of the ring groove then forming a stop or abutment surface upon such axial tightening of the outer ring over the inner ring to completely fill the ring groove and provide for radial support of the hub in the region of the ring groove as well as for transfer of power from the shaft to the hub by engagement of the boss of the hub with the shaft, and of the rings with each other and with the hub, respectively.