Abstract: In an endothermic engine there are two dynamic balancing shafts driven in rotation in respectively opposite directions, at a speed twice that of the rate of rotation of the crankshaft. The dynamic balancing shafts are driven by a toothed belt transmission (1), comprising a driving pulley (2) keyed on the crankshaft, two driven pulleys (3, 4) keyed on the balancing shafts and a tensioning pulley (5) rotatably engaged with the base. The pulleys (2, 3, 4, 5) are connected together by a belt (6) having an internal (9) and external (10) toothing with a toothing pitch (P) equal to 7.5 mm, and provided with a resistant insert (7) formed by glass fibre cords (8) having a diameter equal to 0.9 mm.

Abstract: A front derailleur for a bicycle has a four-point link mechanism, and a control cable is attached by a screw to an end of a connecting arm fixed to one link of the four-point link mechanism. The connecting arm has an auxiliary projection. The control cable applies a torque to the link at a point of contact between the control cable and the auxiliary projection. The screw on the connecting arm is spaced from a chain guide which contacts a chain, to facilitate an operation to attach the control cable to the connecting arm.

Abstract: A bicycle derailleur gear shifting system having a rotatable handgrip actuator coupled with a derailleur shifting mechanism through a control cable system so as to control the derailleur. The derailleur (50) includes an arcuate cable entraining surface (78) which substantially reduces the variation and magnitude of the actuation ratio between control cable linear displacement and movement of the derailleur p-knuckle (88). A b-knuckle flange (160) militates against the derailment of the drive chain from the upper guide wheel while permitting maximum lateral flexing of the drive chain (48) during shifting between sprockets (46) on the freewheel. A rigid arcuate surface (174) may be provided as an extension of the b-knuckle (170) in replacement of a segment of a Bowden cable housing (38) to obviate the accumulation of water and foreign matter.

Abstract: A tensioner for belts including a stationary structure (3), an arm (4) movable with respect to a shaft (7) of the stationary structure, a torsion spring (6), a pair of dampening cones (8), (9) associated with the stationary structure and the arm, a compression spring (10) acting on the dampening cones. The mean radius of the cones is smaller than the maximum radial dimension of the torsion spring. The value "1" of the arm is correlated to the mean radius of the cones determining a frictional dampening between the cones smaller than that existing between the shaft and the rotating arm.

Abstract: A shift control device includes a movable member having a cable support for supporting the transmission cable, wherein the movable member moves as the shifting device actuates the transmission. An assist spring is provided for biasing the movable member in a direction opposite a direction of biasing of the movable member by the return spring of the transmission. The cable support supports the transmission cable such that tension exerted by the assist spring on the transmission cable remains substantially constant regardless of a position of the movable member as the shifting device actuates the transmission. In a more specific embodiment, the cable support moves the transmission cable in a straight line, and the cable support may move the transmission cable without winding the transmission cable about the cable support.

Abstract: A chain shifting apparatus senses bias of pre-set peak pedal force to incrementally move a derailleur cable in a first direction, and to store spring energy. A governor apparatus senses peak cadence to move the cable in a second direction. A cam action from a pedalled-sprocket communicates a timing instant for shifting under low chain transmitting force. A derailleur cable motion distributor communicates single cable up-shift and down-shift instruction from a finger shift and from spring-loaded automatic collet actions to route chains onto available front or rear sprocket sets.

Abstract: A cover fabric for power transmission belts, hoses and the like, having improved durability in service, appearance, and handling characteristics. The cover fabric includes a strip of Jersey knit fabric having a plurality of stitch loops forming interconnected loop chains. The interconnected loop chains form wales and courses. The strip is bias cut such that each of the wales are disposed at an angle with respect to the longitudinal axis of the knit fabric strip. The knit fabric cover may include a coating of elastomer, such as polychloroprene, thereon.Preferably, the wales are disposed at an angle of from about 40.degree. to about 70.degree. with respect to the longitudinal axis, and, more preferably, at an angle of about 55.degree.. Preferably, the wales of the knit fabric cover are disposed at an angle of greater than 90.degree. with respect to the courses, and, more preferably, at an angle of from about 100.degree. to about 110.degree..

Abstract: An apparatus and method for completing or recompleting wells for production is disclosed. The apparatus and method are particularly adapted to the completion of oil or gas wells having a plurality of production zones. In particular, the apparatus is useful for oil or gas wells having production zones which require stimulation prior to initial production of the well, or producing wells which require recompletion in order to open new zones or to reperforate and stimulate existing zones from which production has slowed down or ceased. The apparatus comprises a header spool having a pressure rating that is about as high as the burst pressure rating of the surface casing of the well. The header spool is mounted to a casing spool before a wellhead is placed on the well. The header spool has an internal passage which is at least as large as the diameter of the casing in the well. This permits an efficient completion of the well after the casing is cemented in.

Abstract: This invention relates to the field of power transmission, and more specially, to a torque responsive belt tensioner for a friction belt. Because of recent concerns for the ecology of our planet there has been a resurgence of interest in human powered vehicles (HPV). This category incudes two, three and four-wheeled vehicles. The invention answers the need-for a power transmitting apparatus that will:a) provide forward motion,b) provide a coasting mode,c) provide a braking action,d) provide a reverse.The belt drive tensioner of this invention is lightweight and simple. It includes a rigid backing plate and idler carrier positioned on a drive shaft adjacent to a drive pulley. Two belt engaging members, rollers, or perpendicular columns or projections of sufficient height to contact the exterior surface of the drive belt are carried by the rigid backing plate.

Abstract: An apparatus for sealing a first pressure environment from a second, lower pressure environment, includes a plug having a desired cross section for insertion into a barrier wall aperture shaped to receive the plug. The barrier wall has a first pressure environment on its outside surface and a second environment on its inside surface. A bearing surface on the plug bears against the wall of the aperture. A flexing member, subject to and reactive to the first pressure environment, has an outer surface providing at least a portion of the bearing surface. The flexing member, in reacting to the first pressure environment, flexes at least a portion of the bearing surface to bear more tightly against the wall of the aperture and tends to seal the first pressure environment from the second pressure environment and maintain the seal under a variety of mechanical loads. A chassis is secured within the barrier wall.

Abstract: A method of plugging holes, in particular the plugging of drill holes in earth. The method consists of inserting an auger, having a bit at the lower end and a central rod about which is formed a helical land, into the drill hole and rotating the auger to cause material to be conveyed upward and out of the drill hole. As the auger is moved downward this will cause any plugs or debris within the hole to be removed. After the auger has been inserted to a sufficient depth the rotation of the auger is reversed, and bentonite or other plugging material is poured into the drill hole about the auger. The reversed rotation of the auger will cause the plugging material to be conveyed downward along the drill hole and compacted at the bottom. As the drill hole is filled with compacted plugging material the auger is slowly removed to form a consistent reliable plug of the plugging material. A second method utilizes a tubular capsule filled with coarse ground sodium bentonite.

Abstract: A bicycle crank driven chain wheel assembly uses a special-shaped chain wheel. The chain wheel has portions of different driving radii. The portion having smaller driving radii is engaged in transmission when the bicycle runs on slopes, so that the bicycle rider can drive the bicycle with smaller force. The portion having larger driving radii carries out transmission when the bicycle runs on flat road, so that the bicycle can be speeded up. The crank is mounted in such a manner that it can rotate with respect to the chain wheel within predetermined range of angle, so as to select the corresponding portion of the chain wheel to be engaged in transmission in accordance with the resistance to motion of the bicycle or with the condition of the road on which the bicycle runs. Thus, a variable transmission can be automatically achieved corresponding to the resistance to motion of the bicycle or to the condition of the road.

Abstract: A measuring and control device for guiding a steel belt along a longitudinal axis of a continuously operating press includes a driving drum and a reversing drum for guiding the steel belt. Two measuring columns are respectively anchored in a foundation and spaced longitudinally from either longitudinal side of one end face of the continuously operating press. Four path sensors are disposed on the measuring columns, such that each of the path sensors measure a spacing between the sensor and a point on the continuously operating press. Pressure cylinder-piston arrangements are disposed on the driving drum and the reversing drum to correct the course of the steel belt. Variables for altering the course of said steel belt include the spacings measured by the path sensors.

Abstract: A power transmission belt having a body with an inside and an outside, a length, and a plurality of teeth on one of the inside and outside of the belt body and spaced in a likewise direction. A load carrying cord is embedded in the belt body and extends lengthwise thereof. The load carrying cord is made up of a first plurality of monofilament aramid fibers, each having a denier of 0.5 to 2.0 and bundled to define a combined diameter of 0.10 to 0.20 mm.

Abstract: A facing fabric covering tooth faces of tooth rubber layers of a belt body is treated with a rubber composition in which hydrogenated acrylonitrile-butadiene rubber is mixed with N,N'-m-phenylenedimaleimide.

Abstract: Disclosed is an improvement on bicycle freewheel gear cluster gear-shifting mechanism having at least at least a large-diameter sprocket wheel, an intermediate-diameter sprocket wheel. The improvement includes a plurality of protrusions provided on the rim of the large-diameter sprocket wheel on the side facing the intermediate-diameter sprocket wheel. The plurality of protrusions can be used to prevent the drive chain from overshooting to the large-diameter sprocket wheel when the drive chain is being shifted from the small-diameter sprocket wheel to the intermediate-diameter sprocket wheel. Additionally, a plurality of protrusions are provided on the rim of the large-diameter sprocket wheel near the gear-up assistant hooking members. The plurality of protrusions can be used to prevent the drive chain from being hooked up by the gear-up assistant hooking members when the drive chain is being shifted from the large-diameter sprocket wheel down to the small-diameter sprocket wheel.

Abstract: An autotensioner which is of more compact structure and can be mounted in a limited space. The autotensioner has a fixed member, an arm pivotally mounted on the fixed member, a pulley support shaft mounted on the arm, a pulley rotatably mounted on the pulley support shaft, a cylinder having a damper mounted therein and mounted on the arm, the arm being pivotable about an axis and both the pulley support shaft and the cylinder being mounted on the arm at positions offset from the axis, the damper having a rod mounted in the cylinder so as to be pushed out of and into the cylinder, and a stopper fixed to the fixed member, the rod being kept in contact with the stopper.

Abstract: A linear derailleur for positioning a drive chain in response to displacement of a control cable. The derailleur includes a linear actuator having a substantially uniform actuation ratio over the range of motion of the actuator and, hence, derailleur. The linear actuator also has a mean actuation ratio over its range of motion equal to Cos .theta.:1, where .theta. equals the angle of inclination of the actuator.

Abstract: Method for lubricating and/or cooling a transmission unit, in particular a transmission unit of the type which makes use of a continuously variable transmission (2) with pulleys (5-6) and an endless transmission element (7) provided in between, at least one hydraulic cylinder/piston unit (13) with a pressure chamber (15) which cooperates with the continuously variable transmission (2), and a pressure compensation chamber (23) cooperating with the above-mentioned pressure chamber (15), wherein at least part of the hydraulic medium coming out of the pressure compensation chamber (23) is guided back via a number of parts of the transmission unit (1) to be lubricated and/or cooled, so as to provide for the lubrication and/or cooling of these parts.

Abstract: An automatic transmission system for a cycle including a belt member having a fixed width and extending from a first pulley connected to the pedals of the cycle to a second pulley in driving connection to a wheel of the cycle and an actuator contacting the belt member. The second pulley has a belt-receiving slot of tapering width such that the slot is widest adjacent an outer diameter of the second pulley. The actuator applies the pressure to the belt member in relation to a rate of rotation of the wheel. The actuator causes the belt member to move radially in the tapered slot. The actuator includes an arm member which extends outwardly from the actuator and is in interactive contact with the belt member. The second pulley includes a first pulley half, a second pulley half, and a spindle connecting the first pulley half to the second pulley half. The first pulley half is in resilient relationship to the second pulley half.