Abstract: An arrangement which can reduce the space between a tension pulley of an autotensioner and an engine block and thus reduce the installation space of an autotensioner. A sub-reservoir is provided at the side of a plunger of a hydraulic damper. The hydraulic damper is arranged between the tension pulley and the engine block so that it is received inside the outer periphery of the tension pulley with its plunger abutting a pin of an eccentric ring. It is thus possible to reduce the space between the tension pulley and the engine block.

Abstract: The invention concerns a tensioner for traction drives which includes a base element and a tension roller support arranged partly concentric with each other, and further including a torsion spring which is guided on a bush and braces these two elements against each other. According to the invention, a tension bush (20) which includes a longitudinal slot (21) is inserted between the bush (6) and the inner diameter of the torsion spring (13) so as to bear against the inner periphery of the torsion spring (13).

Abstract: A chain tensioning device includes a pair of levers interconnected and fixed at one end to a rotatably supported base and extending along the chain to be tensioned and a tensioner connected to the other end of one of the pair of levers. One of the levers is disposed on the end side of the chain to be tensioned as viewed from the rotatably supported base and has a convexly curved surface touching internally the chain, and a shoe attached to the convexly curved surface. The other of the levers is disposed on the departure side of the chain as viewed from the base and has a convexly curved surface touching externally the chain, and a shoe attached to the convexly curved surface. A projection on a side of the one of the levers opposite to the shoe for receiving a thrusting force from the tensioner 20 and applying such thrusting force to the interconnected levers.

Abstract: An autotensioner for use in applying a tension to a moving belt, includes a bracket secured to an engine body and having a projection, a rocking member rockingly mounted to the bracket through a first axle and having an arm, a pulley rotatably mounted to the rocking member through a second axle for applying the tension to the moving belt, and a damper device provided between the projection of the bracket and the arm of the rocking member.

Abstract: Apparatus for drilling perforations in a well casing to reinitiate water flow into the casing to restore operation of a well. The apparatus includes a pneumatic drill mounted within a housing which is capable of being lowered into a well casing. The drill is moveable by remote control between a rest position and a working position within the housing to cause a drill bit to pass through a port in the housing to drill perforations at selected locations in the well casing.

Abstract: A hydraulic tensioner having a slidable plunger in a housing, a shaft stopper ring on the rear-end of the plunger, and a stopper screw fastened to the housing that can engage with the shaft stopper ring at the retracted position of the plunger. Packing is provided to seal a clearance between the stopper screw and the housing when the stopper screw is in its engagement position with the housing.

Abstract: A hydraulic chain tensioner has a locking mechanism that includes three grooves and a ring located along the body of the piston. The ring sits partially within each of the first and second grooves to lock the piston into shipping position and completely within the third groove during operation of the tensioner.

Abstract: A hydraulic tensioner is provided with a plunger slidably fitted in a cavity in the tensioner housing and biased in a protruding direction by a spring and fluid. An integral inlet check and pressure relief valve is positioned in the cavity and permits fluid to only flow into the cavity and thereby protrude the plunger but not out of the cavity until a high pressure condition is reached whereupon fluid is relieved out of the cavity back to the fluid source. The integral inlet check and pressure relief valve includes a check spring biasing a valve member a against a pressure relief disk that is biased against the valve member by a pressure relief spring.

Abstract: A power transmission chain in which round pins are inserted in link apertures with D-shaped cross-section and a bushing of U-shaped cross-section. The bushing can be formed of several different shapes in order to decrease the wear between the pins and the associated link apertures.

Abstract: A hydraulic tensioner for operation of a dual chain system including at least one piston maintaining force on two chain guide arms. One embodiment includes an inner and outer piston with a first spring within the bore and a second spring on top of the housing, where each piston contacts a chain guide arm. A second embodiment includes one piston with a fulcrum arm contacting the chain guide arms. A third embodiment includes two pistons arranged side-by-side sharing the same chamber and check valve assembly.

Abstract: A flexible drive member for pushing and pulling an article includes a toothed belt section and ridge members which are arranged on the opposite surface of the toothed belt section along the length direction of the toothed belt section. The ridge members abut adjacent ones when the toothed belt section extends straight. The ridge members include respective hold portions which hold an elongated member, such as a hose and a wire. The abutment of adjacent ridge members enables transmission of pushing force. A fluid-operated device moving apparatus utilizes the flexible drive member which is arranged to have a T-shaped transverse cross-section corresponding to a T-shaped groove in which the flexible drive member can be guided. A fluid-operated device, such as a hydraulically operated clamping device, is coupled to one end of the flexible drive member.

Abstract: A variable speed belt drive having adjustable mass and moment of inertia camweights is shown for use primarily in conjunction with snowmobile, golf cart, all terrain vehicle and small automobile engines. In one version, the camweight includes a series of perforations or score lines surrounding a cross section of the camweight arm. The perforations define a volume that may be snapped or cut off of the arm with a suitable tool. Also, a series of bores are formed through the arm. In order to increase the mass of the arm, a molten metal or similar flowable material may be poured into one or more of the bores and allowed to cure. In another version of the invention, a reduced cross section arm serves as a base onto which shims are added or reoriented in order to achieve the desired mass and moment of inertia characteristics.

Abstract: A tubing friction reducer is mounted on a length of tubing within a bore hole. The friction reducer includes a cylindrical body having a first section and a second section hingedly secured around an exterior surface of the coiled tubing, the cylindrical body having an outside diameter larger than an outside diameter of the coiled tubing and less than an inside diameter of an adjacent bore surface. A plurality of roller bearings positioned on and extending outwardly from the cylindrical body extending in a generally axial direction along the cylindrical body for the purpose of reducing friction between the coiled tubing and the bore surface generated upon contact between the coiled tubing and the bore surface. Retaining mechanisms such as collapsible springs are included for securing the roller bearings to the cylindrical body. The tubing friction reducers are placed along the tubing at intervals to either minimize injector force, prevent buckling, and tubing failure, due to buckling or wear.

Abstract: A sprocket assembly includes a larger diameter sprocket having a plurality of teeth formed on an outer periphery thereof, and a smaller diameter sprocket having a plurality of teeth formed on an outer periphery thereof. A driving chain meshes with the plurality of teeth of the smaller diameter sprocket and is able to shift from a first center of a space defined between the teeth of one pair of adjacent teeth located at the smaller diameter sprocket to a second center of a space defined between the teeth of one pair of adjacent teeth located at the larger diameter sprocket. A distance between the first and second centers is made not equal to an integer multiple of the pitch of the driving chain such that the driving chain is bent between the first and second centers and is deflected from a moving direction thereof which is along a tangent line drawn from the first center of the smaller diameter sprocket, and such that the driving chain has a deflection point relative to the first and second centers.

Abstract: A chain and sprocket system includes a plurality of chains and sprockets. The system includes a crankshaft, an idler shaft and two overhead camshafts. The two sprockets on the idler shaft that connect by chain to drive the camshafts are phased or offset with respect to each other to alter the impact and chordal action generated noise. These idler camshaft sprockets and the idler sprocket of the crankshaft are all manufactured separately and then placed together on a spline or hub. In this way, the idler sprocket assembly consists of four parts, which eases manufacture and assembly.

Abstract: A hybrid chain assembly includes structure from both roller chain and silent chain. The inner chain links include bushings that ride along the teeth of a sprocket and the outer chain links include link plates including depending members as found in silent chains which contact the teeth of a sprocket.

Abstract: A single component tensioner arm or chain guide for a power transmission chain formed by injection molding which integrally forms both a carrier portion and a slide portion. The one piece tensioner arm is constructed of a polymer material containing graphite or aramid fibers to increase structural rigidity.

Abstract: This invention relates to a process for increasing the effectiveness of production chemicals by reducing the number of squeezing and shut-in operations needed to increase the production rate from an oil well. The process includes injecting into an oil-bearing rock formation a water-miscible formulation including as components: (a) a water-miscible surfactant which is an alkyltriglycol ether and (b) at least one water-miscible oil field or gas field production chemical, said components of the formulation being introduced either as a pre-formed single composition, or simultaneously in parallel or sequentially in either order into the rock formation via the production well.

Abstract: A fill valve includes a tubular housing which accommodates a valve member which is biased toward a closed position by a light spring. The valve member includes a head and a tubular portion which is provided with two large windows. When the fill valve is open fluid flows freely through the tubular portion of the fill valve and out of the windows.

Abstract: A variable ratio drive mechanism, suitable for a bicycle for example, has at least one gear whose effective radius is variable in a stepless manner in response to applied torque and/or in response to an external force. The gear may include a helical spring (10) which is "wound up" as torque is applied, to decrease its radius. Other possibilities include a rim (20) supported by spokes in the form of compressible springs (22), or a series of outwardly biased arcuate members (30) arranged around a central hub.