Abstract: A coupling has: a first coupler rotatable about an axis and defining first connections distributed about the axis; a second coupler defining second connections distributed about the axis, the second connections offset from the first connections; and segments distributed about the axis and extending radially from the first connections to the second connections, a segment of the segments having a first end engaging a first connection of the first connections and a second end engaging a second connection of the second connections, the first end circumferentially offset from the second end, a face of the segment abutting against a face of the first coupler when the segment is inserted into the first connection in a first orientation such that a penetration depth of the segment into the first connection in the first orientation is less than the penetration depth in a second orientation opposite the first orientation.

Abstract: In one embodiment of the present disclosure, there is provided a drive tube and swashplate trunnion assembly. The drive tube and swashplate trunnion assembly includes a drive tube having a plurality of grooves formed on an outer surface of the drive tube; a swashplate trunnion having a plurality of grooves formed on an inner surface of the swashplate trunnion, wherein individual grooves of the plurality of grooves on the swashplate trunnion mate with individual grooves of the plurality of grooves on the drive tube to form a plurality of channels; and a plurality of cylindrical bearings, wherein each of said cylindrical bearings is disposed within an individual channel of the plurality of channels.

Abstract: A compressor system includes a compressor including a rotary shaft, an impeller, and a casing, a motor including a motor rotor disposed coaxially with the rotary shaft, and a coupling shaft coupling the motor rotor to the rotary shaft. The compressor includes a compressor bearing that rotatably supports the rotary shaft, and a compressor connecting hub that is fixed to the rotary shaft at a position where the compressor connecting hub overlaps the compressor bearing in the axial direction and at a position on an inner side in the radial direction. The coupling shaft is allowed to alleviate misalignment with the compressor connecting hub. The compressor bearing rotatably supports an outer peripheral surface of the compressor connecting hub.

Abstract: A modular motor assembly structure is disclosed and configured to couple with a drive shaft of an application device. The drive shaft includes a receiving slot. The modular motor assembly includes a main body and a combination key. The main body includes a shaft hole and a key groove. The shaft hole includes an opening and a central axis. The key groove is disposed on a side wall around the shaft hole and parallel to a central axis of the shaft hole. The combination key has a front end and a rear end. When one end of the drive shaft is inserted into the shaft hole along the central axis of the shaft hole, the combination key is at least partially accommodated in the receiving slot, and the front end faces the key groove. The combination key has a continuously increasing thickness from the front end to the rear end.

Abstract: A suspension system supports a chassis relative to a crawler mechanism including a continuous track. A link is rotatable about an axis extending transversely through a first portion. The first portion includes a projections extending radially inwardly, and peripheral openings defined by spaces between the projections. An axle member secured to the crawler mechanism includes peripheral shafts extending radially outward from the axis and positioned in an associated peripheral opening. Each resilient member is positioned within an associated peripheral opening and engages an associated peripheral shaft, damping movement of the peripheral shaft relative to the link. An auxiliary roller assembly includes a yoke and a plurality of auxiliary rollers coupled to the yoke. The yoke is rotatable relative to the crawler frame about a yoke axis. The auxiliary rollers are aligned along a direction of travel of the track and are configured to engage an inner surface of the track.

Abstract: A rotational and axial control spring includes a tubular casing, a shaft, and a plurality of elongated elastomeric members. The casing comprises a tubular cross sectional equilateral convex polygon shape, the tubular shape extending uniformly between a first and second casing end. The shaft is fabricated having a cross sectional shape mimicking the equilateral convex polygon casing shape, a series of exterior surfaces extending longitudinally between a first smaller end and second larger end, wherein the exterior surfaces form a square frustum shape. The elastomeric members are formed as cylindrical frustums. The shaft is inserted within the casing interior. Each elastomeric member is positioned contacting a respective shaft exterior surface and a pair of adjacent casing interior surfaces. The elastomeric members provide rotational spring with adjustable resistant force and dampening functions. The tapered features provide an axial retention function.

Abstract: A torsional vibration damper for coupling two machine parts disposed coaxially to each other, in particular for coupling a cylindrical inner surface of a first machine part to a cylindrical outer surface of a second machine part, has a plurality of clamping bodies and a plurality of intermediate elements. The intermediate elements have higher elasticity than the clamping bodies and are disposed between adjoining clamping bodies.

Abstract: A shaft coupling has an input element adapted to be rotationally driven about an axis, an output element rotatable about the axis adjacent and limitedly relative to the input element, and an intermediate element rotatable about the axis adjacent and limitedly relative to both the input element and the output element. A first coupling assembly with progressive resistance to torque is fixed between one of the input and output elements and the intermediate element. A second coupling assembly with linear resistance to torque is fixed between the other of the input and output elements and the intermediate element such that torque is transmitted between the input and output elements through the coupling elements in series with each other in a single stage.

Abstract: A pump assembly constructed to allow unloaded starting of the pump. The assembly includes a pump body, a permanent magnet rotor, a rotor shaft, a pump cover, a shaft sleeve and an impeller. The impeller includes a holding chamber for holding the shaft sleeve which is arranged proximate a center of the impeller. A stopping rib extends inwardly from an internal wall of the holding chamber of the impeller. The shaft sleeve includes a tubular body with a starting rib extending laterally from the body. During operation of the pump, the starting rib interferes with the stopping rib. A number of shock absorbing pads are disposed between the starting rib and the stopping rib and maintained thereat by a notch and ridge association that extends along each rib and pad. The pump includes a space that allows rotation of the starting rib relative to the stopping rib which provides unloaded starting of the pump.

Abstract: A motor vehicle steering shaft (3) is provided with: an inner shaft (11) and a tubular outer shaft (10) fitted into each other and to transmit a torque to and from each other; a rigid coupling element (25) for rigidly coupling the inner shaft (11) and the outer shaft (10) in a circumferential direction (C) of the inner shaft (11) when a relative rotation amount of the inner shaft (11) and the outer shaft (10) exceeds a predetermined range; and an elastic coupling element (36) for elastically coupling the inner shaft (11) and the outer shaft (10) in the circumferential direction (C) of the inner shaft (11) when the relative rotation amount of the inner shaft (11) and the outer shaft (10) is within the predetermined range. The elastic coupling element (36) includes a resin member (36). The inner shaft (11) and the outer shaft (10) are elastically supported mutually via the resin member (36) at a central position of the predetermined range when no torque is loaded to the steering shaft (3).

Abstract: A multi-rate torsional coupling (20) features parallel first and second drive connections (82 and 84) between input (24) and output (22) members. The first drive connection (82) extends through a first resilient coupling (38), and the second drive connection (84) extends through a second resilient coupling (40). An angular play coupling (70) engages the second drive connection (84) at a particular torque load for transmitting additional torque through the torsional coupling (20) at a higher spring rate.

Abstract: A torque transfer coupling includes a shaft and a first second set of hydraulic devices. Each hydraulic device of the first set of hydraulic devices has a first end operably connected to a first end of the shaft, wherein the hydraulic devices of the first set of hydraulic devices are disposed about an axis of the shaft. Each hydraulic device of the second set of hydraulic devices has a first end operably connected to a second end of the shaft, and wherein the hydraulic devices of the second set of hydraulic devices are disposed about the axis of the shaft. Each hydraulic device can include a piston and cylinder assembly wherein extension and retraction of each piston of each hydraulic device is generally tangential to a portion of a circle encircling the shaft.

Abstract: A method to assemble a marine drive system wherein an acceptable-unacceptable criterion on the torsional vibration of a shaft of the marine drive system is established based on the correlation between the torsional stiffness of a propeller shaft and the moment of inertia of a propeller. A desirable elastic coupling for the marine drive shaft is selected based on the criterion. The marine drive system is assembled by using a flywheel, a marine reverse and reduction gear, and an elastic coupling, whose property is changeable, lying between an input shaft of the marine reverse and reduction gear and the flywheel.

Abstract: A motor vehicle steering shaft (3) is provided with: an inner shaft (11) and a tubular outer shaft (10) fitted into each other and to transmit a torque to and from each other; a rigid coupling element (25) for rigidly coupling the inner shaft (11) and the outer shaft (10) in a circumferential direction (C) of the inner shaft (11) when a relative rotation amount of the inner shaft (11) and the outer shaft (10) exceeds a predetermined range; and an elastic coupling element (36) for elastically coupling the inner shaft (11) and the outer shaft (10) in the circumferential direction (C) of the inner shaft (11) when the relative rotation amount of the inner shaft (11) and the outer shaft (10) is within the predetermined range. The elastic coupling element (36) includes a resin member (36). The inner shaft (11) and the outer shaft (10) are elastically supported mutually via the resin member (36) at a central position of the predetermined range when no torque is loaded to the steering shaft (3).

Abstract: A drive transmitting device includes: a rotational shaft having peripheral surface with a cut-off surface extending along an axial direction of the rotational shaft; a bearing member for supporting the rotational shaft, the bearing member being in slide contact with the peripheral surface of the rotational shaft; and a spacer which is mounted in a clearance formed between an inner circumferential surface portion of the bearing member and the cut-off surface of the rotational shaft.

Abstract: A transmission joint for angularly connecting a first and a second member, and having a coupling member interposed functionally between the first and second member and extending about an axis; the coupling member has: a first portion connectable angularly to the first member, a second portion connectable angularly to the second member and located radially outwards of the first portion, and an intermediate portion interposed radially between the first and second portion and elongated in a direction crosswise to the axis; the intermediate portion of the coupling member has, from the first portion to the second portion, a first portion decreasing in thickness crosswise to the direction, and a second portion of constant thickness.

Abstract: A force transmitting coupling for drivingly coupling winding devices of adjacent architectural coverings. The coupling includes first coupling member, a second coupling member, and mating engagement means on the first and second coupling members adapted to establish mating engagement between the first and second coupling member to transmit a drive force from one of the first and second coupling members to another of the first and second coupling members. The second coupling member includes a hub and the engaging means on the second coupling member are resiliently connected to the hub.

Abstract: A flexible connector may include a tube having an open end and a lower end distal from the open end, an inner surface of the open end comprising a plurality of apices forming a substantially polygonal lower cross-section, an upper shaft having an insert end disposed insertably in the open end, an outer surface of the insert end comprising a plurality of substantially planer flats forming a substantially polygonal upper cross-section normal to the driven axis of rotation, the upper cross-section being substantially similar to the lower cross-section, and an elastic member disposed compressably between each of the flats and each of the apices.

Abstract: A multi-rate torsional coupling (20) features parallel first and second drive connections (82 and 84) between input (24) and output (22) members. The first drive connection (82) extends through a first resilient coupling (38), and the second drive connection (84) extends through a second resilient coupling (40). An angular play coupling (70) engages the second drive connection (84) at a particular torque load for transmitting additional torque through the torsional coupling (20) at a higher spring rate.

Abstract: A hinge is provided suitable for attaching a hood to a car or truck. The hinge includes generally tubular members sharing a common axis of rotation. Elastomeric elements interposed between the tubular members provide isolation between the parts of the hinge. Relative rotation between the tubular members compresses the elastomeric elements creating a spring-force opposing the relative rotation. The hood, hinge, and vehicle may be configured so that the spring-force of the elastomeric elements assists in opening and/or closing of the hood.

Abstract: Two-step protruding portions are provided in a cover of a pulley for hooking the cover on the pulley. When a bridging part is broken, a driving-unit-side portion of the bridging part is outwardly displaced in a rotation axis direction of the pulley. The first-step protruding portion of the cover thereby slips out from a hooking state. However, after the driving-unit-side portion mounts on the driven-unit-side portion, no further force acts outwardly in the rotation axis direction. As a result, the second-step protruding portion of the cover is hooked on the pulley, so that the cover can be fixed to the pulley. This results in inhibiting broken bridging parts or dampers from dispersing.

Abstract: An elastic coupling having two coupling sections is provided. A first coupling section has a plurality of spaced-apart pockets disposed along an arc. Elastomeric elements are positively held in the pockets, and the second coupling section has projections that extend into the first coupling section respectively between two adjacent elastomeric elements. The elastomeric elements comprise two regions having different properties. The first region, which extends radially and is held in the pockets of the first coupling section via its ends, is more inherently stable than is the second region for the transmission of a peripheral force. The second region, which respectively faces one of the projections of the second coupling section, is more yielding than is the first region such that deformations can be introduced into the second region with the effect of a slight restoring force.

Abstract: Disposed around a universal joint (12), which comprises a first and a second substantially rigid joint body (14, 28), is a rim (40) of loop-shaped flexible coupling elements (42), which are each looped around one first molded piece (50) and one second molded piece (52). The first molded pieces (50) are connected rigidly to a flange (22) on the first joint body (14) and disposed between second molded pieces (52). The second molded pieces (52) are connected firmly to a counter-flange (34), which forms part of a rotational body (62). The latter forms one end of a torque transmission chain, the other end of which is the second joint body (28). The first joint body (14) has a tubular piece (16), which encloses the second joint body (28) and has an outer lateral surface (18) of circular cross section, against which the flexible coupling elements (42) are supported in radial direction.

Abstract: A torsional shock absorber dampens rotary shock loading on a well drill string. An outer housing has drive splines on an inner surface. A mandrel is located within the outer housing and has drive splines on an outer surface that fit between the drive splines on the inner surface of the housing. Dampening bars are positioned longitudinally between the splines of the outer housing and the splines of the mandrel to absorb shock from non-uniform torsional loading at the drive interface between the outer housing and the mandrel. A balancing piston is located within the tool to compensate for pressure difference between drilling fluid pressure and lubricant contained within the shock absorber. A thrust bearing assembly is provided to accept axial thrust loads from the outer housing and transfers the load to the splined mandrel. A retainer transfers tensile loads from the housing to the mandrel through the thrust bearing.

Abstract: A coupling assembly adapted to connect an engine directly to a transmission, comprising in combination a flywheel adapted to be connected to the engine. A modified transmission plate for connecting the transmission to the flywheel is provided. The modified transmission plate has a plurality of connection ports that contain alternatively at least a first torsional dampener and at least a second torsional dampener that are positioned within the connection port. The first torsional dampener has a first indentation hardness that is less than the second indentation hardness of the second torsional dampener. The first torsional dampener is adapted to dampen engine idle vibrations and the second torsional dampener is adapted to dampen engine acceleration vibrations. Whereby, the first torsional dampener and the second torsional dampener reduce the emission of torsional vibrations between the engine and the transmission.

Abstract: A torsional vibration damper with optimized damping characteristic includes a primary body (1), a secondary body (2), and a drag element which comprises at least one friction element with at least one pressure device, at least one catch and at least one elastic element. The elastic element has an elastomeric (5) in a cavity (8).

Abstract: A prop rotor hub includes a constant velocity joint in the same plane as a prop blade yoke. Torque is transmitted from a shaft to the blades through the CV joint, hub plates attached to the CV joint, and the yoke, which is attached to the hub plates. Providing all elements in a substantially planar arrangement results in a hub assembly which has significantly less height than a traditional design. The hub itself is in-plane with the yoke, resulting in a more efficient torque transmission from the mast to the rotor.

Abstract: An elastic shaft joint includes: a tube shaft; a shaft coaxially inserted in the tube shaft so that a predetermined axial region of the shaft overlaps with a predetermined axial region of the tube shaft; and a damper inserted between the predetermined axial region of the shaft and the predetermined axial region of the tube shaft for damping vibration and providing an elastic play in a rotation direction.

Abstract: A coupler for connecting first and second shafts has a male cross member pinned to the first shaft and a female body member clamped onto the second shaft. The female body member has a housing with internal splines interlocking with mating external splines on the cross member. A longitudinally split clamp has a sill portion integral with the female body member and a half clamp member engageable with the sill portion. The split clamp has a single locking bolt which reduces the time required for installation. The external splines are relieved at one end to allow the coupler to tolerate some misalignment between the shafts.

Abstract: A slip coupling comprised of a hub with extending flexible vane(s). The vane(s) extend from the hub at an acute angle which allows them to flex when coming in contact with a relatively rotatable friction cylinder. The friction between the vane(s) and the friction cylinder creates resistance to movement. Relative motion between the hub and friction cylinder occurs only when the frictional force between them is overcome.

Abstract: A supercharger for a V-twin motorcycle engine comprised of a transmission portion and a blower portion is disclosed. A first embodiment includes a power take-off coupling having a drive gear rotationally engaged with a vertical drive shaft wherein the drive shaft is coupled to the blower's input drive via a pair of output drive ration selection gears. A second embodiment includes an alternative transmission structure wherein rotational transmission passes through a series of spur gears and a set of bevel gears. A set of quick-change gears to alter the gear ratio of the second embodiment is also disclosed.

Abstract: A coupler for coupling shafts has an inside coupling having an outer periphery and a center opening with a longitudinal axis which is adapted to receive the end of a driving shaft. An outside coupling has a center opening with an inner periphery, and is rotatably fitted over the outer periphery of the inside coupling. A plurality of arcuate notches are located in the outer periphery of the inner coupling and the inner periphery of the outer coupling and are adapted to register with each other in mating relationship wherein the mating notches present collectively a circular roller surface. A plurality of cylindrical rollers are rotatably mounted in the notches of the inside and outside coupling and serve to operatively join the inside and outside coupling for rotation together. The notches in the inside coupling have an arcuate portion capable of receiving the rollers in a nesting position without the rollers penetrating the notches in the outside coupling.

Abstract: A vibration canceler for use on the outer circumference of a shaft rotating about an axis and including two enlargements. The vibration canceler includes half-shells which can be pressed on to the outer circumference of the shaft. The half-shells are joined to at least two inertial masses formed as circle segments by elastic elements which are deformable in a circumferential direction. The inertial masses are joined together by retaining elements. The inertial masses are hingedly joined by link elements and can be restrained in a ring shape by at least one lock element.

Abstract: An isolation coupling which provides for isolation of torsional vibration, from a drive component to a drive component, such as a driven shaft, due to non-constant drive forces. The vibration isolation coupling includes a drive assembly connected to the drive component, and a driven assembly connected to the driven component. The drive assembly and the driven assembly are axially aligned, such as being mounted on the shaft of the drive component for example. A member, having torsional compliability, interconnects the drive assembly to the driven assembly. Accordingly, vibrations imparted to the drive assembly are isolated from the driven assembly by such torsional compliability of the member.

Abstract: A dual-rate drive coupling (20) for use in transmitting drive torque between drive and driven members. The first torque rate is near zero for no-load and near no-load conditions. A pair of flexible elastomeric arms (24, 26) which is preferably bonded to the inner member (22) are received in recessed portions (44, 46) in the outer member (40) and provide the coupling with this first very low torque rate. When higher torque loading produces a relative rotation between the outer member (40) and the inner member (22) of at least about 15.degree., a pair of snubbing arms (28, 30) of the inner member (22) interact with surfaces of openings (48, 50) of the outer member (50). The contact surfaces of these second snubbing arms (28, 30) are coated with an elastomer to snub all contact between the inner member (22) and the outer member (40) to inhibit vibration induced rattling.

Abstract: A decoupling device comprising first and second coaxial elements in mutual rotary driving engagement and including resilient decoupling means enabling relative angular displacement for decoupling purposes between the first and second elements. The decoupling members comprise at least one fin carried by the first element and at least one first and one second abutment carried by the second element and angularly spaced apart one from the other, and at least one first and one second resilient device interposed between the fin(s) and the first and second abutments, respectively.

Abstract: A torsional vibration damper with an outside ring and an inside ring which surround each other and are connected to each other with rotational elasticity by way of spokes which can be deflected in the circumferential direction. The spokes are non-deformable and are connected with the inside ring and with the outside ring by way of intermediate layers made of rubber.

Abstract: A shaft coupling between telescopically overlapped ends of a first shaft and a second shaft including a plurality of inside linear grooves in the first shaft, a plurality of outside linear grooves in the second shaft cooperating with the inside linear grooves in defining a plurality of linear cylindrical passages between the first and the second shafts, and an elastomeric bearing in each of the linear cylindrical passages consisting of a pair of barrel-shaped lugs at opposite ends of an integral beam spring. The barrel-shaped lugs couple together the first and the second shafts for unitary rotation about and for relative linear translation in the direction of a longitudinal centerline of the shaft coupling. The inside and outside grooves bear tangentially against the barrel-shaped lugs. The beam springs maintain substantially zero angular lash between the first and the second shafts by resiliently tipping the barrel-shaped lugs endwise in the linear cylindrical passages.

Abstract: An armature assembly (4 or 15) for an electromagnetic coupling device has a stop plate (9), rubber dampers (11) and an armature (12). Stop plate (9), which is formed in a press from a single steel plate, has a boss (9b), flanges (9c) and a periphery wall (9a). The periphery wall (9a) reinforces the stop plate (9) and forms damper covers (9e) on the ends of the flanges (9c). The damper covers (9e) have a wall surface (9d) that surrounds the damper chamber except for an opening on one side of the damper cover facing toward the boss (9b). A rubber damper (11) with a torque pin (10) is mounted in each damper cover (9e). An armature (12) is secured to the torque pins (10) by staking. The opening in one side of the damper cover permits the rubber damper 11 adjacent to the opening to move toward the torque pin (10) when that portion of the rubber damper is subjected to a tension force. This movement of the rubber damper (11) reduces the maximum stress in the damper and increases damper life.

Abstract: A torsion damper for a clutch disc is disposed in window holes provided in power input and output rotating elements of the clutch disc, for elastically coupling the power input and output rotating elements in a direction of their rotation. The torsion damper includes a pair of seat elements (11) and a rubber element (12) therebetween. In one embodiment, the rubber element (12) is positioned between both the seat elements (11) and is capable of expanding and contracting. The rubber element includes a projection (20) and a through-hole (16) is provided in each of the seat elements (11).

Abstract: The torsional flexible connection has two coaxial flanges or discs equipped with sets of equidistant radially or axially protruding blades which are interdigitated to form a plurality of wedge-shaped chambers whose sides intersect at the axis of the connection, all or some of which receive torque-transmitting flexible inserts which transmit force and rotation to one of the flanges/discs in response to the force and rotation transmitted from the other flange/disc or vice versa. Each insert is comprised of two or several elements of a streamlined shape placed at different distances from the axis, so that the dimensions of these elements in the direction of transmitted payload are proportional to their distances from the axis.

Abstract: To facilitate assembly of a shaft coupling, a sleeve is provided with a polygon configuration either on the hub or in the polygonal opening of the drive side flange and is axially slidable in the matching polygon. Where the sleeve surrounds the hub, it is braced inwardly by the elastically compressible bodies between the sleeve the outer polygon. Where the sleeve fits against the outer polygon, it forms a cage retaining the elastically compressible bodies against a hub on the shaft for insertion into the opening in the flange.

Abstract: A torsional vibration damper with an outside ring and an inside ring which surround each other and are connected to each other with rotational elasticity by way of spokes which can be deflected in the circumferential direction. The spokes are non-deformable and are connected with the inside ring and with the outside ring by way of intermediate layers made of rubber.

Abstract: An accessory drive for attachment to the end of a shaft. The drive comprises a belt pulley, a carrier with at least a first and a second planet wheel that are strongly coupled and which have differing numbers of teeth, the first planet wheel being in engagement with a first gear circulating along with the shaft, and the second planet wheel with a second gear that is rotatable relative to the shaft, an activatable and deactivatable brake being provided between a continuously stationary part and a part capable of relative rotation, and a freewheel to prevent backward relative rotation of the second gear with respect to the end of the shaft. The first and second gears are arranged radially inside the carrier, such that the freewheel is arranged between the carrier and the part capable of relative rotation and the belt pulley at least partially surrounds the freewheel, the carrier, and the brake radially and externally, and so that the belt pulley and carrier are joined in rotary engagement.

Abstract: A two-stage shaft coupling has inner elastomeric bodies between polygonal surfaces of a hub and an opening in the flange and outer coupling members which come into play subsequently in windows elongated in the direction of rotation and spaced around the axis in the flange. The two sets of coupling elements are not axially offset to provide a relatively flat shaft coupling.

Abstract: A flexible drive shaft coupling with two stage torsional flexibility. The exible drive shaft coupling allows axial, radial, and bending misalignment of the input and output shafts while vibrationally isolating the shafts from one another. At low torque, power is transmitted from the input shaft through an elastomeric ring to the output shaft. At higher torque the elastomeric ring is deformed to allow contact between a less resilient snubber assembly and a drive plate mechanically connected to the output shaft. Power is transmitted through less resilient snubber assemblies which provide for greater power transmission. The axis of the coupling can be provided with a flexible spool assembly to allow transmission of exhaust mass from the input shaft to the output shaft.

Abstract: A marine drive for coupling a marine engine drive ring to a transmission drive shaft. A spider drive engages the drive ring and is provided with a plurality of rubber-cushioned trapezoidal lugs. The drive shaft is held in the spider drive by a central locking hub which is drawn tightly onto the drive shaft due to the tapered aperture in the spider drive. Wear-causing slippage of the drive shaft is thereby reduced.

Abstract: An outer ring for a vibration proof homokinetic joint has inner and outer casings. Vibration proof members made of an elastic material are disposed between the inner and outer casings. The outer casing is formed on an inner peripheral surface thereof with protrusions angularly spaced therebetween. The inner casing is formed on an outer peripheral surface thereof with grooves angularly spaced therebetween to receive the protrusions therein with predetermined gaps formed therebetween and extending in the direction of rotation of the joint. The vibration proof members are mounted between the adjacent protrusions and between the inner peripheral surface of the outer casing and the outer peripheral surface of the inner casing.

Abstract: A longitudinal and rotary vibration dampener or shock absorber for rotary and percussion drill bits comprises a resilient element to absorb axial compression loads, preferably in a compression mode; a resilient element to absorb axial tension loads, preferably in a compression mode; resilient elements to absorb torque loads in clockwise and counterclockwise directions preferably in a compression mode; radial guide surfaces for long wear between the driver and the driven members and preferably spaced apart axially to resist bending couple loads applied across the two members during operation; and a seal and surface to allow passage of air or other fluid through the unit during operation. All resilient elements, guide members, and seals are readily replaceable in the field. The unit is structurally sound and enclosed and is attachable to the drilling rig drive head and drill pipe or to the drill pipe and bit as the case may be.

Abstract: A flexible coupling in which segmented elastomeric coupling elements are fixed to radially extending from immovable flanges on annular inner and outer coupling members by a fastening system. A plurality of bushes in the elastomeric elements receive bolts extending from movable clamping plates to the immovable flanges to hold the elastomeric elements in compression.