Abstract: A pulley for a synchronous drive system comprising a toothed-belt of polymeric material, the pulley comprising grooves provided with flanks having a parabolic arc-shaped profile and a bottom whose ends coincide with the vertices of said parabolic arc-shaped profile. The length of the bottom is comparable with that of the parabolic arc-shaped profiles. Preferably, the grooves have a shape determined by a hob whose rolling pitch line is tangent to the outer circumference of the pulley.

Abstract: This disclosure relates to an applicator for placing a sealant into a groove, and comprises a member having a lower side, the lower side being adapted to extend into the groove. The lower side has an arcuate shape and a sealant passage extends through the member and includes an outlet opening in the lower side. The arcuate lower side is adapted to extend partially into said groove and engage the upper corners of the groove during use. The applicator further includes a limiter attached to the member, the limiter extending laterally of the lower side and over the upper corners of the groove.

Abstract: A slotted wall milling cutter for producing a slotted wall in the ground has a drive motor fixed to the cutter frame and a gear means positioned between the drive motor and two cutting wheel gears and which is partly arranged in recesses of a bearing bracket. The cutting wheel gear is constructed as a multistage planetary gear. A particularly high torque is made available on the cutting wheels with this arrangement. In addition, the cutting wheels can be constructed with a very high effective cutting width compared with the total slot width.

Abstract: Devices for holding mining and road maintenance cutter bits, wherein said devices for holding comprise a cutter bit support block, a clevis and a support block locking mechanism whose geometries have been adapted such that the cutter bit support block can be fixedly and rigidly held in a channel in the clevis by the support block locking mechanism, which has a locking bolt. The support block locking mechanism and the clevis have means for interacting and cooperating such that each abuts with, and applies a downward pressure to, a lower body portion of the support block and thereby drives downward facing longitudinal shoulders on the support block into abutment under pressure with upward facing abutment shoulders of two longitudinal walls forming the channel in the clevis.

Abstract: An isolation valve that may be inserted in the casing of a subterranean well at a position above a production formation and operated to a closed position upon the withdrawal of the mandrel and wash tube commonly employed for effecting the gravel packing of the screen and production formation. The valve has a frangible flapper piercable by mechanical means or by increased pressure after removal of the wash tube.

Abstract: A downhole flow controller for use in recharge, injection and aquifer storage recovery (ASR) wells to prevent the free cascading of water and thereby eliminate the entrainment of air which may cause plugging of an aquifer wherein the controller includes a fixed tubular member which is selectively mounted to the lower end of a pump column of a well and in which an inner upwardly biased flow regulating tubular member is axially movable so as to automatically adjust the flow through vertically alignable openings through each of the fixed and movable tubular members dependent upon the direction of fluid flow, pressures and operating conditions within the well pump column and aquifer. In some embodiments, an adjustable flow regulating sleeve may be provided exteriorly of the fixed tubular member in order to vary the flow of fluid through the openings therein.

Abstract: A load block for a chain-belt constructed of interleaved sets of links and load blocks in which the load blocks have a window with a window-bottom defining a surface relieved so that the load transferred from the links to the load blocks occurs mainly through the outermost or edge links.

Abstract: A lateral hole boring method whereby a lateral hole of a desired length is formed underground by repeatedly performing the following steps. A vertical hole is prepared, and a lateral hole boring apparatus equipped with a leading auger of a smaller length than the diameter of the vertical hole is lowered into the vertical hole to a predetermined position. The apparatus is manipulated from the ground level to advance and rotate the leading auger to bore a lateral hole. When the lateral hole has reached a predetermined length commensurate with the length of the leading auger, the advance movement of the leading auger is stopped, and the lateral hole boring apparatus is manipulated from the ground level to detach the leading auger therefrom, and is lifted above the vertical hole while leaving the leading auger in the lateral hole.

Abstract: Disclosure is made of a power unit wherein a housing is made split along its longitudinal axis. A tubular elastic vessel is internally coaxially accommodated in the housing. Disposed between the expandable portions of the housing are expanding inserts trapezoidal in section, bearing by their larger bases against the tubular elastic vessel and by the sides, against the inner walls of the housing portions. For delivery of a working medium into the space of the elastic vessel provision is made for two pipe unions, each of which is installed for longitudinal movement in a holder having a flange disposed in a circular recess made on the inner surface of the housing. An electric element surrounding the elastic vessel is installed in the same circular recess. Each of the elastic vessel ends is disposed between the pipe union and the holder.

Abstract: An endless power transmission belt construction and a transverse belt element therefor as well as a method of making the same are provided, the belt construction comprising an endless carrier unit and a plurality of transverse belt elements assembled on the carrier unit, each belt element comprising a block of polymeric material having a reinforcing unit of metallic material disposed therein. Each reinforcing unit comprises two spaced apart side parts that extend outboard of one of the surfaces of the carrier unit and extend outboard of the other of the surfaces of the carrier unit. Each belt element has a slot receiving the carrier unit therein and a shoulder arrangement that defines part of the slot and engages the inner surface of the carrier. The side parts of each reinforcing unit of each belt element respectively have portions thereof that comprise the shoulder arrangement of their respective belt element.

Abstract: In a belt tensioning device comprising a fixed structure, a pivoted structure mounted with respect to the fixed structure for pivotal movement about a first axis between first and second limiting positions, a belt engaging pulley rotatably carried by the pivoted structure for rotational movement about a rotational axis parallel with the pivotal axis, a spring acting between the fixed and pivoted structures for resiliently biasing the pivoted structure to move in a direction away from the first limiting position toward the second limiting position so as to tension a belt engaged by the pulley, and a damping mechanism for damping the pivotal movements of the pivoted structure about the pivotal axis. The damping mechanism includes a stack of damping elements having interengaging pairs of surfaces disposed transversely with respect to the pivotal axis so as to be slidable with respect to one another in spaced planes of revolution about the pivotal axis.

Abstract: A running string is releasably connected to a liner an liner hanger setting arrangement for lowering into a well bore casing and securing the liner to a casing. The liner hanger setting arrangement includes a first sleeve with upper and lower annular rows of conically shaped segments circumferentially spaced thereon. Upper and lower spaced rows of hanger slips are connected to a second sleeve by elongated strips and the second sleeve is releasably secured to the first sleeve whereby the second sleeve may be released from the sleeve for relative longitudinal movement therebetween to move the hanger slips onto the segments and secure the liner to the casing. The space between the segments in each row is substantial to accommodate relatively unrestricted fluid flow thereabout as the apparatus is manipulated and operations conducted in the well bore.

Abstract: A multiple rotary drive system for a textile-working machine has first and second clutch-brake units. Each clutch-brake unit has a rotatable flywheel, a non-rotatable brake surface, and a rotatable shaft to be driven, whereby the rotatable shaft can be connected to the textile-working machine as a rotary drive of the system therefor. A clutch disc and a brake disc of each clutch-brake unit are connected to the shaft thereof for rotation therewith and are arranged for controllably engaging with, respectively, the flywheel for rotatably driving the shaft therefrom and the brake surface for braking rotation of the shaft therefrom. The flywheel of the first clutch-brake unit is rotationally driven, whereby the drive system can be driven by a continuously-rotating shaft of a continuously-operating electric motor. A belt extends about each flywheel for coordinate rotation of the flywheels when the one is rotatably driven by the electric motor.

Abstract: A blast joint comprising a series of standard length joints of production tubing is disclosed. The blast joint includes a series of cylindrical rings composed of an abrasion resistant material mounted about the tubular tubing joints forming a protective shield about the production tubing. A movable sleeve formed of cylindrical abrasion resistant rings is selectively shiftable to enclose and shield the tubing connection assemblies joining the production tubing forming the blast joint. The production tubing and abrasion resistant rings form a blast joint whose length exceeds the standard length of a single joint of production tubing.

Abstract: An endless chain-belt assembly for engagement around a pulley or tooth sprocket includes an intermediate portion comprising a plurality of center links for engaging the sprocket, the links being connected by transfer of pins. An edge portion defining the opposed edges of the chain-belt assembly as a plurality of edge links defining a surface for engagement with surfaces of the pulley. Structures provided for removably attaching the edge links to the intermediate portion. A tensioning assembly for maintaining tension on the chain-belt assembly includes a first and second tensioning pulley, roller or sprocket for pivotal movement in the plane of rotation of the belt and bias and biasing structure for normally biasing the first idler pulley and the second idler pulley in engagement with the belt.

Abstract: The invention deals with a road marking tape which has retroreflective elements and protruding anti-skid elements, and which means is provided for preventing damaging of the retroreflective elements by snow plowing means. The preventing means is designed in accordance with the present invention in a special manner as a compressible element which is composed of a compressible material so that in response to impact of the protruding elements of the tape by the snow plowing means the compressible material of the compressible element compresses and the original thickness of the compressible material reduces to a predetermined thickness which is selected so that the protruding element sink into the groove by the depth at least equal to the height of the protruding elements.

Abstract: This process comprises positioning along a predetermined direction two walls penetrating a geological formation to be fractured. During a preliminary period a predetermined amount of hydraulic fluid in injected.During a preliminary period/hydraulic fluid is injected simultaneously into both wells during for a sufficient time interval at a pressure insufficient to fracture the formation, either at a substantially constant flow rate, or in a stepwise manner at progressively increasing pressure levels. This preliminary injection is followed by the injection of hydraulic fluid into at least one of the wells at a pressure higher than the pressure of fractuation of the formation.

Abstract: A boring head for duo-pipe drilling apparatus comprises a body having a passage for material return extending therethrough from the cutting end to the coupling end, the passage having an inlet at the cutting end displaced from the axis of rotation of the head and extending substantially across the full radius thereof, and an exit at the coupling end co-axial with the axis of rotation. The cutting end comprises one or more teeth having attacking edges overlying the inlet and beveled for mechanically displacing material into the inlet upon rotation of the head. Fluid supply galleries open into the passage for directing pressurized fluid from the duo-pipe system towards the exit of the passage for flushing cut material to the exit. The coupling end of the boring head is adapted for connection to the duo-pipe system with the annular passage of the duo-pipe system in communication with the fluid supply galleries and with the inner tube of the duo-pipe system in communication with the exit of the passage.

Abstract: A high-strength side pocket mandrel for high pressure service having a full-opening bore throughout its length but having a bore of keyhole shape above its receptacle bore to provide minimal but ample space for operation of a kickover tool for installing devices in the receptacle bore and providing strengthened walls for withstanding greater forces which would tend to burst or collapse the mandrel.

Abstract: This invention relates to roller cone, air circulation type rock bits. Means are provided on the rock bit body as well as on the shirttail portion of each of the legs extending from the body to provide a relief to pass rock chips from the borehole bottom and up the drill string as the air circulation roller cone bit works in a formation.