Abstract: The bushing includes an outer cylinder, an inner cylinder, and an elastic body therebetween. The outer cylinder has a central recess portion formed in a curved shape. The inner cylinder has a central convex portion being formed in a curved shape. A distance between a vertex of the central recess portion and the vertex of the central convex portion is smaller than a distance between a point other than the vertex of the central recess portion and a point at which a straight line extending from the point other than the vertex of the central recess portion to an intersection point of the perpendicular line and the axis of the inner cylinder intersects the central convex portion.

Abstract: A method of manufacturing a damping device, notably for a steering tie rod, the said device comprising a rod which extends along a main axis and which is intended to be connected to a first mechanical component, a securing portion which surrounds the said rod and which is intended to be connected to a second mechanical component, and a sleeve made of elastomeric material which is arranged between the rod and the fixing bushing so as, through elastic deformation thereof, to allow at least axial movement of the fixing bushing with respect to the rod, in which method the fixing bushing is offset axially with respect to the rod to force the elastic deformation of the sleeve and the introduction of a corresponding preload, then the sleeve is locked so as to keep it, when the device is at rest, in a state of permanent axial elastic deformation and preload.

Abstract: An assembly includes a vehicle component. The assembly includes a body embedded in the vehicle component, the body defining a chamber and having an outer surface defining an intrusion extending toward the chamber and engaged with the vehicle component. The assembly includes a plurality of dampening particles within the chamber.

Abstract: A rotational shaft is placed through insertion holes of rubber washers sandwiching a portion of an impeller having a mount hole. The impeller is mounted on the rotational shaft with a nut on a threaded distal end portion of the rotational shaft. The rotational shaft of the motor includes a locking surface. The insertion holes of the rubber washers each have the same shape as the cross-sectional shape of the rotational shaft. The mount hole of the impeller includes a spacing portion extending at an angle from the linear portion of the insertion hole of each rubber washer away from the locking surface of the rotational shaft. Although the impeller rotates with respect to the rotational shaft under a frictional force applied from the nut tightened against the rotational shaft, this structure prevents metallic contact between the impeller at the mount hole and the locking surface of the rotational shaft.

Abstract: An object of the present invention is to provide a vibration-damping device which enhances the durability of a rubber elastic body; and inhibits the occurrence of voids in an outer cylinder. The vibration-damping device includes: an inner cylinder; a resin-made outer cylinder arranged outside the inner cylinder in a radial direction of the outer cylinder; and a rubber elastic body connecting the inner cylinder and the outer cylinder.

Abstract: Bushings and methods of manufacturing bushings to be used in a chassis of a vehicle or the like for damping and absorbing vibrations, oscillations, and noise are provided. In one implementation, a method of manufacturing a bushing includes the steps of positioning a flexible member around a cylindrical outer surface of a rigid inner member having a cylindrical inner surface or solid core and positioning an outer member having a cylindrical inner surface around the flexible member. The method also includes the step of clamping a cylindrical outer surface of the outer member to form an indentation in the cylindrical outer surface of the outer member, thereby deforming the flexible member. This method may be executed to create a bushing having certain axial, radial, and torsional stiffness.

Abstract: A blower fan including an impeller easily mounted on the rotational shaft of a motor generates less noise. The impeller is mounted on the rotational shaft of the motor using a fastener with an elastic vibration isolator and a washer in between. The washer has a predetermined shape including radial projections from a circumference about a central receiving hole. The vibration isolator has the predetermined shape larger than the predetermined shape of the washer, and has a first recess having the predetermined shape on its top surface to receive the washer fittingly. The impeller has a second recess having the predetermined shape on its top surface to receive the vibration isolator fittingly. The vibration isolator thus separates the impeller mounted on the rotational shaft from the washer in both the axial and rotational directions of the motor to reduce vibrations in both directions propagating to the impeller, generating less noise.

Abstract: A bar pin bushing assembly including a bar pin having at least one end with at least one bore to receive a fastener, the at least one bore extending through the at least one end, the bar pin having a central portion having a diameter that is greater than a width or diameter of the at least one end of the bar pin, a compressible rubber section positioned around the central portion of the bar pin, the compressible rubber section further extending around downwardly tapering surfaces adjacent the central portion of the bar pin, an outer metal shell mold bonded to the compressible rubber section, a first disc insert positioned over a first end of the outer metal shell, a second disc insert positioned over a second end of the outer metal shell, and a tubular outer metal wall positioned over the outer metal shell, the first disc insert, and the second disc insert.

Abstract: An arrangement of an impeller (3) on a rotating part, preferably on an electric motor (1), in particular on an external rotor motor, wherein the torque of the motor (1) is transmitted to the impeller (3) by a rotationally secure connection between the rotor (2) of the motor (1) and the impeller (3) or its impeller hub (4), and wherein the connection is created by means of a press fit between the impeller hub (4) and the rotor (2), with integration of a sleeve (6) which is preferably securely assigned to the impeller hub (4) and which takes up mechanical stresses, is characterized in that the sleeve (6) is polygonal and is pressed onto the surface of the rotor (2), with at least minor deformation, forming axial contact surfaces. Also specified is a method for producing such an arrangement.

Abstract: A linear compressor comprising a cylinder part including a cylinder bore. A piston disposed in, and is slidable within, the bore. A main spring connects the cylinder part directly or indirectly to the piston. A connecting rod connects between the main spring and the piston. A stator has an air gap, and the connecting rod passes through the air gap. At least one armature pole is located along the connecting rod.

Abstract: A vibration isolation fastener insert comprising: a rigid cylindrical hub having an externally extending flange and a through longitudinal opening to receive a fastener. An elastomeric bushing around the hub has a slot therein receiving the external flange. An upper housing is disposed around the side of the bushing and has a flange over the top of the bushing. A lower housing is disposed around the external side of the upper housing and has a flange extending below a lower surface of the bushing.

Abstract: The present invention provides connecting element, which includes mold frame and back plate; side of back plate disposed with convex bump unit having a bottom surface, side of mold frame disposed with opening having elastic latch unit inside, latch unit having latch hook part with top surface; wherein bottom surface of convex bump unit contacting to push top surface of latch hook part to make latch unit and convex bump unit fitly engaged, side of top surface of latch hook part near free end of latch hook part higher than bottom surface of convex bump unit. The invention also provides backlight module and disassembly method. Through designing different latch unit and convex bump unit, the invention effectively prevents latch hook part from springing back and damages caused by repetitive flipping latch hook part during disassembly. The invention ensures easy assembly/disassembly and reduces cost.

Abstract: The present invention provides connecting element, which includes mold frame and back plate; side of back plate disposed with convex bump unit having a bottom surface, side of mold frame disposed with opening having elastic latch unit inside, latch unit having latch hook part with top surface; wherein bottom surface of convex bump unit contacting to push top surface of latch hook part to make latch unit and convex bump unit fitly engaged, side of top surface of latch hook part near free end of latch hook part higher than bottom surface of convex bump unit. The invention also provides backlight module and disassembly method. Through designing different latch unit and convex bump unit, the invention effectively prevents latch hook part from springing back and damages caused by repetitive flipping latch hook part during disassembly. The invention ensures easy assembly/disassembly and reduces cost.

Abstract: A positioning device includes first, second and third elements. The first element includes a cross-linked thermoplastic and the second element is non-circular and configured adjacent a first side of the first element, and configured for relative rotation with the first element about an axis. The third element is configured adjacent a second side of the first element. The first, second and third elements are configured such that a first compressive strain amount is induced on the first element while there is no relative rotation between the first and second elements and a second compressive strain amount is induced on the first element while there is relative rotation between the first element and the second element. The second compressive strain amount is at least 3 times higher than the first compressive strain amount.

Abstract: A vibration isolation fastener insert comprising: a rigid cylindrical hub having an externally extending flange and a through longitudinal opening to receive a fastener. An elastomeric bushing around the hub has a slot therein receiving the external flange. An upper housing is disposed around the side of the bushing and has a flange over the top of the bushing. A lower housing is disposed around the external side of the upper housing and has a flange extending below a lower surface of the bushing.

Abstract: An elastomer-containing rod end isolator. The isolator includes a handle for connection to a load and inner and outer members. The outer member is a pocket and the inner member is spherical or nearly so. The pocket and the inner member are concentric and the inner member has two continuous exterior legs extending in a circular path. An elastomer fills most of the space between members.

Abstract: The present invention relates to a slotted joint comprising a central pin and an outer tube. In one embodiment, the slotted joint comprises a first and second elastomer arm, which are bonded to an outer surface of the central pin diametrically opposite each other and spaced apart from each other to form a first and second space. The slotted joint further comprises a first abutment positioned in the first space and a second abutment positioned in the second space. The first and second abutments include an abutment part made of a rigid material and a cylindrical sector made of an elastomer. The cylindrical sector may be bonded to an outer surface the central pin and to an inner surface of the abutment part. An outside face of the cylindrical sector is spaced apart from the inner surface of the outer tube when the joint is at rest.

Abstract: An elastomer-containing rod end isolator. The isolator includes a handle for connection to a load and inner and outer members. The outer member is a pocket and the inner member is spherical or nearly so. The pocket and the inner member are concentric and the inner member has two continuous exterior legs extending in a circular path. An elastomer fills most of the space between members.

Abstract: Connectors having redundant fasteners for interconnecting adjacent structures are disclosed. Some connectors have first and second bearing bodies and a member disposed between the bearing bodies. A first fastener is held in tension and extends through the bearing bodies and the member. The tension in the first fastener urges the bearing bodies against each other in compression. A second fastener held in loose engagement relative to the bearing bodies and the member extends through the bearing bodies. On release of the tension in the first fastener, such as by failure of the first fastener, the second fastener is placed in tension.

Abstract: An attaching element for the connection of two components 1, 2 ensures the connection of the components 1, 2 with a predefined possibility for movement relative to each other. The attaching element includes two legs 3, 4 essentially parallel to each other, which are connected by an elastic connecting portion 5 integrally formed with the legs 3, 4, with the elastic connecting portion 5 having a partly circular cross-section in side view.

Abstract: A projecting portion 52 which becomes convex in radial direction is formed in a rubber elastic body 5 for connecting together an inner cylindrical body 3 mounted to a shaft portion 21a of a lower shift lever member 21 by external interfit and an outer cylindrical body 4 mounted to a cylindrical portion 22a of an upper shift lever member 22 by internal interfit. Formed in an inner peripheral surface of the outer cylindrical body 4 is a recessed portion 42 which becomes concave with clearances C1 and C2 of respective given amounts left between the recessed portion 42 and the projecting portion 52. This makes it possible to manufacture a shift lever bush 1 having a two-stage spring characteristic at low cost.

Abstract: A bellows-type pipe junction for mechanically joining the spaced-apart ends of two pipes in a liquid-tight manner includes two sleeve sections fitted onto the two pipe ends and a flexible offset section joined at its two ends to the two sleeve sections by respective flexible bellows-type joints. The flexible offset section and the flexible bellows-type joints provide a fluid-tight junction while accommodating axial and radial offsets between the two pipe ends. The pipe junction is especially suitable for joining the pipes of an aircraft drain mast.

Abstract: A wiper assembly for surface maintenance vehicles has a non-destructive failure mode when impacting stationary objects, or otherwise becoming subject to instantaneous or rapidly increasing resistance to forward movement, due to an improved mechanical coupling. The improved mechanical coupling for a wiper assembly absorbs some of the impact stresses imparted to the wiper assembly. Portions of each improved mechanical coupling designed to absorb the stress forces deforms most nearest the location of increasing resistance to forward movement, and may either become fully disconnected if the stress force reaches a threshold force value or recoils to the original mounting location after absorbing forces that are less that said threshold force value. The threshold value force at which a wiper assembly dislodges from its mounting location is designed to avoid damage to the wiper assembly, the articulated mounting member (if any), and the maintenance vehicle itself.

Abstract: The present invention relates to a knife ring joint, the purpose whereof is to reduce mechanical friction and to increase weighing accuracy in a scale which is used in the casting of molten material. The knife ring is designed to be pressed in a ring-like fashion against a cylinder surface serving as the countersurface, and any motion in the direction of the lengthwise axis of the cylinder surface is prevented by of a flexible element.

Abstract: A slipper bushing assembly including a series of concentric members for permitting controlled sliding movement between a support element and a movable element. The concentric members of the slipper bushing assembly include a rigid one piece inner metal member joined to the support element, a hollow cylindrical elastomeric member, a rigid, one piece hollow outer metal member, a solid slip surface and structure for preventing the inner metal member from disengaging from the outer metal member. The inner metal member has a pair of opposing ends and an outer cylindrical-like surface. The elastomeric member encircles the outer surface of the inner metal member and has a pair of opposing ends, an outer surface and an inner surface. The outer metal member is joined to the movable element and has a pair of opposing ends and an outer cylindrical surface. The slip surface is contiguous to the inner or outer surface of the elastomeric member and coextensive therewith.

Abstract: An attachment for a noise-and-vibration dampening fixing of a windshield wiper system to a vehicle body comprises a fastening eye with a circular aperture for receiving a rubber-elastic, hollow, cylindrical, noise-and-vibration dampening element with circumferential annular groove on its outside surface. Good stability of the attachment and its easy assembling are achieved in that, proceeding from the circular aperture, an open break extends through an edge, raised in an approximately perpendicular manner, so that a web is fastened on yoke tongues of a resulting yoke opening and bridges the yoke opening. The dampening element is insertable sideways through the yoke opening as far as into the aperture.

Abstract: A tensioning member for a blade screen that permits simultaneous tensioning of a plurality of blades in a blade screen, such as for wood chip sorting. The blades may be provided with a sawtooth detail on a bottom edge to reduce the build-up of wood ribbons or fines that would otherwise occur. An elastomeric joint is also provided which allows a dual-frame blade screen to be assembled, while compensating for any phase angle error between eccentric shafts provided to agitate the wood chips by moving the screens.

Abstract: A pipe joining construction includes a tube, two or more extensions extended from the tube, a tube member coupled to each of the extensions so as to form a joint portion, an insert disposed in each of the tube members and the extensions and having an envelope and a foamable material disposed in the envelope, a covering having an outer layer wrapped around the joint portion and a foamable material disposed between the outer layer and the joint portion. When foamed, the foamable materials apply forces against the tube members and the extensions so as to solidly couple them together.

Abstract: A double locking connection device is provided between two sheet metal components to press the two components together and to prevent them from pivoting about an axis. A first component includes at least one arc-shaped key-hole having a) a first arched zone of a first width, a second arched zone following the first arched zone and having a second width smaller than the first width, and a third zone arranged between the first and second and having a width which decreases progressively in a direction of rotation from the first width to not greater than the second width. The second component includes an elastic locking tab suitable for placement in the first arched zone and having a width slightly less than the first width but greater than the second width so that relative rotation of the two components results in the double locking thereof.

Abstract: A shock mount is used for mounting a first member of a piece of furniture to a second member thereof. The shock mount includes an elastic portion and a metal portion secured to the elastic portion. The metal portion has an exposed surface of a shape which conforms to the first furniture member. The elastic portion is secured to the second furniture member, the exposed surface of the metal portion is adhesively secured to the first furniture member, and the elastic portion absorbs various loads imparted by the first and second furniture members.

Abstract: A joint is described which has a pair of coaxially aligned elastic rings (5) of truncated conical form the respective vertices of which are directed in opposite ways and are engaged each between a central core (3) externally having an attachment surface (3a) of truncated conical form and an outer collar (4) internally having an attachment surface (4a) of truncated conical form converging towards a vertex (V) which is common to the converging vertex of the attachment surface (3a) of the core (3).Each elastic ring (5) comprises an inner layer made of elastomeric material (10) and an outer layer (11) made of elastomeric material between which a laminar insert piece of truncated conical form (12) is inserted, the inner (12a) and outer (12b) surfaces of which converge towards the common vertex (V) of the attachment surfaces (3a, 4a).The outer elastomeric layer (11) is greater in thickness that the inner elastomeric layer (10).The described joint (1) has an improved fatigue limit.

Abstract: A thermal vellum medium includes a wood pulp based substrate having a thermal layer, comprising a heat-sensitive, image-forming material disposed on one side thereof and a silicone layer impregnated into an opposite side of the substrate.

Abstract: An alignment coupler is illustrated having a flat head screw permitting radial adjustment between a workpiece and a piston rod and a second screw making connection with a cylinder to compensate for direct misalignment wherein first and second rings of high density polyethylene and the like are provided to impart shock absorbing and noise dampening characteristics to the coupler between the first and second screws.

Abstract: A bushing assembly for use with an associated torque rod comprises a bar pin, an elastomeric bushing, and an outer sleeve. The bar pin has a middle section which is generally rounded but which features a flat portion between 30% and 40% of the axial length of the middle section. The elastomeric bushing bonded to the bar pin is compressively received within the outer sleeve so that the total height is reduced by approximately 10%. The edges of the outer sleeve are curled inwardly toward a longitudinal axis of the assembly.

Abstract: A cylindrical vibration damping bushing is provided which has an outer cylinder, an inner cylinder coaxially disposed within the outer cylinder, and having a radially outwardly expanded portion in its axially central portion, a pair of vibration damping rubber members press-fitted between the outer cylinder and the inner cylinder from both ends of the outer cylinder, and a pair of inserts, each being made of a resin material having good slidability and embedded in an inside end portion of each vibration damping rubber member so that an inside end surface thereof abut on each other. Each insert has a concave surface having a configuration conforming to that of the spherical outer surface of the expanded portion of the inner cylinder to enable the inserts to be slid on the spherical outer surface of the expanded portion.

Abstract: Two support assemblies for respectively supporting the tapered end and the cylindrical end of an elongated tubular elastomeric spring between two opposed spring seats are disclosed. The support assembly for the tapered end is made up of an elongated retaining member which is positionable generally transverse to and entirely inside the tapered end. This retaining member includes two inclined portions which bear down upon the inside of the tapered end when pulled in an outward direction by a bolt thredably secured to a convetional spring seat. The support assembly for the cylindrical end is made up of a second retaining member which is positionable generally transverse to and entirely inside the cylindrical end. The second retaining member includes a plurality of expandable flange portions which engage the inside of the cylindrical portion as the retaining member is pulled in an outward direction by a second bolt threadably secured to the second spring seat.

Abstract: Two support assemblies for respectively supporting the tapered end and the cylindrical end of an elongated tubular elastomeric spring between two opposed spring seats are disclosed. The support assembly for the tapered end is made up of an elongated retaining member which is positionable generally transverse to and entirely inside the tapered end. This retaining member includes two inclined portions which bear down upon the inside of the tapered end when pulled in an outward direction by a bolt threadably secured to a conventional spring seat. The support assembly for the cylindrical end is made up of a second retaining member which is positionable generally transverse to and entirely inside the cylindrical end. The second retaining member includes a plurality of expandable flange portions which engage the inside of the cylindrical portion as the retaining member is pulled in an outward direction by a bolt threadably secured to the second spring seat.

Abstract: The invention provides an elastic articulated coupling which comprises a relatively rigid inner member having a longitudinal axis, a relatively rigid outer member having a generally cylindrical interior of a predetermined first diameter surrounding said inner member with substantial clearance, and an elastomeric body located in the clearance between the inner and outer members. The elastomeric body is connected firmly to the inner member. Additionally, a sleeve comprising wear-resistant elastic material is firmly connected to the elastomeric body and disposed between the elastomeric body and the outer member. The elastomeric body and the sleeve together have a predetermined second diameter which is greater than the predetermined first diameter defined by the interior of the generally cylindrical outer member. As a result, the sleeve is connected in a non-positive manner with the interior surface of the outer member merely by radial pre-stressing and by axial bracing.

Abstract: A sealed pivot joint suitable for joining together the adjacent links of an endless belt, for example, a tank track. The joint has a bearing (10) rotatable on a pin (8), and an elastic sleeve (20) whose extremities are in sealed relationship to the pin and bearing thereby preventing the ingress of abrasive material into, and the egress of lubricant from, the bearing surface (12). The sleeve is maintained in circumferential tension by tensioning members (14, 16, 18) between the sleeve and the pin which act to prevent wrinkling of the sleeve when the pin and bearing are rotated relative to one another thereby reducing abrasive wear on the outer surface of the sleeve.

Abstract: The present invention includes a bushing having an eccentric inner bore, used for adjusting camber and caster in conventional vehicle steering structures. The bushing assembly is preset to provide a desired camber and caster adjustment when mounted on the steering structure in a predefined orientation.

Abstract: An improved axle clamp is provided, particularly for use with composite material leaf springs, to securely fix the position of the leaf spring relative to a wheel axle or other suspension system member. The axle clamp comprises a rigid clamp base, a resilient wedge insert, a rigid clamp plate, and a resilient cover pad. The clamp base provides a bottom wall and substantially parallel side walls extending from the bottom wall to form a channel adapted to receive the wedge insert. The inner surface of at least one side wall of the clamp base fairs from both ends into a channel-widening concavity, preferably at the longitudinal mid-point of the channel. The wedge insert has a bottom wall and substantially parallel side walls extending from the bottom wall and forming therewith an inner channel adapted to laterally jacket a leaf spring.

Abstract: The subject of the invention is a tie rod joint for motor vehicles for the linking of the inner ends of two tie rods to a steering rod, actuated by a steering gear, the inner ends of the tie rods being shaped as formed joint parts, which project in each case between an outer and an inner bearing part, while between the joint parts and the outer bearing part on the one hand, and the inner bearing part on the other, inlays are arranged, and while the outer bearing part, the joint parts, the inlays and the inner bearing part are prestressed by at least one tension bolt fastened to the steering rod.

Abstract: An improved axle clamp is required, particularly for use with composite material leaf springs, to securely fix the position of the leaf spring relative to the axle or other wheel carrying member such as in the suspension system of an automotive vehicle. The present invention provides an axle clamp comprising a clamp base (1) and a wedge insert (2). The clamp base provides a platform portion (3) and substantially parallel side walls (4A, 4B) extending from the platform portion to form a channel adapted to receive the wedge insert. The inner surface of at least one side wall of the clamp base provides a channel-widening concavity (5A, 5B). The wedge insert has a platform portion (7) and substantially parallel side walls (9A, 9B) extending from the platform portion forming an inner channel adapted to jacket a mid-portion of the leaf spring (10).

Abstract: An armature of an electromagnetic clutch is connected to a mounting plate which is coupled to the toothed driven hub of the clutch through the intermediary of an elastomeric spider. If the spider is melted by heat, the mounting plate wedges against the tips of the teeth of the hub and is prevented from flying axially off of the forward end of the hub.

Abstract: An exhaust gas recirculation valve pintle is secured on a hollow valve stem by a radially elastic retaining ring which allows the pintle to be withdrawn from the stem for removal of exhaust gas deposits.

Abstract: An improved wind-propelled apparatus is disclosed which includes a body mounting a stub mast generally orthogonal thereto. The stub mast is mounted in a well formed on the body and secured by a sleeve, resilient annulus and plug combination. Mounted on the stub mast is a generally vertical sail mast which is rotatable about a vertical axis. The stub mast also mounts a boom of sufficient length as to be capable of passing under the sail and having an eye and strap arrangement for securing the boom on either side of the sail.

Abstract: This invention relates to an universal movable-joint device for connecting a sea-bed exploitation column to its base arranged on the sea floor. This device is essentially constituted by a joint element of resiliently deformable material interposed between the foot of the column and the base and connected to the said foot and base, respectively.

Abstract: A hub assembly for a helicopter rotor system having a monolithic thin-wall hub shell made from composite material and including centrally apertured upper and lower wall portions integrally joined at the outer periphery of the shell and spaced apart at inner regions. The upper and lower wall portions cooperate to define a plurality of bearing sockets angularly spaced relative to the axis of rotation and connecting webs extending between angularly adjacent sockets. Elastomeric blade retaining bearing assemblies supported within the sockets retain and support rotor blades for articulate movement. Each bearing assembly has a seating surface which cooperates with an associated bearing surface on the socket in which it is contained to prevent relative rotation therebetween. Mounting flanges on the helicopter rotor shaft and retaining flanges on the hub shell are arranged to permit the rotor system to be lowered on the rotor shaft when the retaining flanges are disconnected from the mounting flanges.

Abstract: A ball joint construction having a ball-stud member with a ball portion and a shank portion and an open-ended socket member into which the ball portion is inserted. An elastomeric covering is permanently bonded to both the ball member and a part of the shank portion to provide increased bond life and strength and then deformed for inserting in the open end of the socket thereby resiliently interconnecting the socket and ball members. An additional rib or lip of elastomer is provided on the covering of the ball adjacent the shank which collapses into a continuous multiple curved pattern during insertion into the socket. The rib provides for increased life of the elastomer by improved surface tension parameters and also keeps stones and other debris out of the open-ended portion of the socket. A further bonding between the socket and elastomer after insertion provides a completely bonded system capable of accepting very substantial angular movement without slippage or pullout.

Abstract: A tensioning apparatus for an endless power transmission device is provided and utilizes the elastic properties of an elastomeric material to provide the tensioning action and such apparatus is supported adjacent the endless power transmission device to be tensioned and has components thereof operatively associated with the elastomeric material and with the device.