Abstract: A steerable drill head which utilizes the combination of a hydraulic cutting nozzle and a rotary mechanical cutting blade wherein the drill string is intermittently rotated and lineally advanced in the bore. The drill head further includes a ramp attached to the head behind the cutting blade including a steering surface for deflecting the drill head and its string in a particular direction by linear advancement without rotation. The cutting blade is positioned at the center of the head with the plane of the blade positioned on the axis of rotation of the drill head.

Abstract: A transmission system for vehicles. The transmission system has a pulley mounting a shaft extending from a mandrel of a power source, an automatic clutch for driving a wheel and a belt linking the pulley with the clutch. The pulley has a first section securely mounting the shaft, a second section axially moving along the shaft and a disk securely mounting the shaft. The first and second sections each have a belt-engaging side shaped as a truncated cone. The second section further has a slide-engaging side formed with a number of radial slopes. A corresponding number of slides contact the slopes and the disk.

Abstract: A V-drive clutch assembly for a V-belt driven vehicle is described. The V-drive clutch assembly includes a fixed sheave plate for mounting on the drive shaft of the vehicle, a movable sheave plate assembly, a cam follower assembly, a neutral retainer coil spring under tension and a bearing plate. The weight arms of the cam follower assembly are disposed radially relative to the axis of the drive shaft. The clutch is characterized by cool running and light weight.

Abstract: A transmission device for a bicycle is provided including a first transmission for obtaining a forward driving force. The first transmission drives a first free wheel in conformity with movement of a first drive unit when a crank shaft is forwardly rotated. A second transmission obtains a forward driving force by converting a direction of the rotating force produced in a rotational direction of a second drive unit. The rotational direction is supplied to a second free wheel under a reverse rotation of the crank shaft. A forward driving force is obtained regardless of the rotational direction of the crank shaft, thereby improving an exercise effect.

Abstract: A power transmission belt having improved service life in high and low temperature environments is disclosed. The power transmission belt includes a compressed rubber layer of a low density chlorosulfonated polyethylene having a straight-chain molecular structure which is formed so that the chlorine content is within the range of about 15 to about 35% by weight. The chlorosulfonated polyethylene can have a sulfur content in the range of about 0.5 to about 2.5% by weight. A magnesium oxide-aluminum oxide solid solution can be admixed with the chlorosulfonated polyethylene. The power transmission belt can also include an adhesion rubber layer made of a chloroprene rubber composition or a hydrogenated acrylonitrile-butadiene rubber composition with at least one tension member at least partially embedded therein.

Abstract: Casing slip joints are provided on opposite sides of a fracture initiation location to accommodate casing and formation movement during fracturing of a well. In another aspect of the invention, the fracture initiation location is provided by forming openings through the well casing and then forming fan-shaped slots in the formation surrounding the casing. Those slots are formed by a hydraulic jet which is directed through the opening and then pivoted generally about the point of the opening. These fan-shaped slots circumscribe an angle about the axis of the casing substantially greater than the angle circumscribed by the opening itself through which the slot was formed. These techniques are particularly applicable to fracturing of horizontal wells.

Abstract: A belt tensioner and method of making the same are provided, the tensioner comprising a support for being fixed relative to a belt, a belt engaging arm carried by the support and being movable relative thereto, a spring operatively associated with the support and the belt engaging arm for urging the belt engaging arm relative to the support and against the belt with a force to tension the belt, the support comprising a shaft having a longitudinal axis, the belt engaging arm being rotatably mounted on the shaft, the arm having a bearing surface angled relative to the axis and the support having a bearing surface angled relative to the axis and facing the bearing surface of the arm, and a bushing disposed between the bearing surfaces and in engagement therewith to facilitate movement therebetween and to tend to prevent cocking of the arm on the shaft when the belt engaging arm is tensioning the belt.

Abstract: A running tool for running casing in a subsea well has a full bore. The running tool is run on casing which will be of the same inner diameter as the diameter of the well casing. The running tool has a body and a movable seal sleeve. The seal sleeve carries a casing hanger seal. After cementing, manipulation of the casing causes the seal sleeve to move downward to a lower position to set the seal.

Abstract: A mower apparatus includes multiple mowing sections each having a separate mower and each being interconnected with adjacent sections by hinge mechanisms. The mower sections are driven by a motor through a single endless belt reeved to be driven by the motor and to drive each of the mowers of the sections. The belt is configured in a unique manner such that as the belt crosses between adjacent hinged sections, the belt is run substantially parallel and in close proximity to the pivot axes of the hinge such that when the sections are pivoted relative to one another the belt does not substantially slacken or tighten.

Abstract: A chain tensioner utilizing oil as an operating fluid comprises a housing having a vertical bore and a plunger projecting upward through an opening at the upper end of the bore and urged by a spring in the projecting direction. The plunger has an internal oil reservoir formed near its upper end, a passage leading from the reservoir to a high-pressure oil chamber formed by the housing and plunger, a check valve preventing flow from the high-pressure chamber to the reservoir, and an opening permitting flow of oil into the reservoir. A second oil reservoir, annular in shape, is formed in the housing at the location of the opening to provide an oil seal between the plunger and the wall of the bore. This oil seal prevents air from flowing between the plunger and the wall of the bore into the high-pressure chamber. In one embodiment, an auxiliary spring is located in the second oil reservoir.

Abstract: The present invention relates to a soil compactor equipped with at least one movable drum. To generate the desired compacting forces, the drum is equipped with two oppositely rotating exciter shafts which are matched to one another in their phase positions so that, if the exciter shafts are vertically superposed, their centrifugal forces act horizontally and in the same direction, thus causing a moment free horizontal force to be exerted on the drum axis, while, with the exciter shafts disposed in a juxtaposed arrangement, the centrifugal forces are amplified in the vertical direction and compensate one another in the horizontal direction.

Abstract: A torque transmission system for effecting a driving connection between laterally spaced driving, and driven shafts. A fist wheel is mounted on the driving shaft and a second wheel is mounted on the driven shaft. Each of the wheels have substantially identical pitch diameters. An endless flexible torque transmitter operatively connects the first and second wheels. A traveling insert band circumscribes and operatively engages one of the wheels at a time, and when the traveling insert band engages one of the wheels, the insert band is located radially inwardly of the endless flexible torque transmitter. The traveling insert band has leading and trailing ends located in substantially circumferentially opposed juxtaposition when the traveling insert band operatively engages one of the wheels. Mechanisms are also provided selectively to derail the leading end of the traveling insert band from that wheel operatively engaged thereby.

Abstract: A horizontal earth boring method and system which uses hydraulic linear and rotary drives in combination with a compressed air flow to the drilling element. The compressed air flow is utilized in addition to continuously flush the bored hole which greatly increases drilling efficiency and lowers power requirements. A smaller hydraulic drive unit is thereby required and the overall system can be controlled from an out-of-ditch location.

Abstract: A bicycle front derailleur has a guide assembly for shifting a chain among a plurality of sprockets of different sizes. The guide assembly comprises an outer guide plate, an inner guide plate extending substantially parallel to the outer guide plate, and bridge members interconnecting the outer and inner guide plates in a spaced relationship. The inner guide plate includes an upper plate portion, and a lower plate portion extending from the upper plate portion. The lower plate portion includes a first plate portion and a second plate portion, the second plate portion being elastically deformable relative to the first plate portion axially of the sprockets.

Abstract: A power transmission V-belt having a plurality of longitudinally extending load-carrying/tensile cords embedded in an adhesive rubber layer, a compression section having a plurality of laterally extending cords embedded in a second rubber layer, and a reinforcing rubber layer interposed between the adhesive rubber layer and the laterally extending cords.

Abstract: A coiled tubing service unit and method for oil and gas wells including a string of components extending above ground in coaxial alignment with said well and including an injector for injecting coiled tubing into the well and a sealing unit for preventing the flow of pressurized oil and gas from the well. The sealing unit is adapted to be disconnected from the string of components and removed from the coaxial alignment to permit a relatively large-diameter tool assembly to be inserted therein. The sealing unit can then be repositioned and connected in the string of components and the coiled tubing can be reinserted into the string, connected to the tool and driven into the well.

Abstract: There is disclosed wellhead equipment wherein a tubing hanger suspended from a running tool lowered with the running tool into a landed position within a bore of a casing head, and a seal assembly suspended from the running tool is, upon landing of the hanger, lowered into an annular space between the tubing hanger and bore so as to seal with respect to them and thereby close the space.

Abstract: An earth boring drill bit having a relatively large tool passage port offset to one side of the bit centerline. The port is offset to permit substantially full bottom hole coverage of the cutting structure. The port permits various logging and sampling tools to pass through the bit to allow sampling and testing to be performed without tripping out the drill string.

Abstract: Rock drilling device comprising a drilling tool with a set of tubes (7) and a set of rods (9) arranged therein. The drilling tool comprises a number of sections which each comprises a tube (7), a rod (9) and an end piece (11). The rod is provided with projections (10) at least near one of its ends for cooperation with parts (13,14) with reduced diameter in the tube and end piece respectively. The part (13) in the tube limits the movement of the rod in a direction away from the end piece. The part (14) in the end piece limits the movement of the rod in a direction towards the end piece. All thread connections (12) between different sections of the drilling tool and between tube and end piece within each section are made in the same way and thus equally easy to break.

Abstract: A pre-adjustable, spring-loadable tensioner for belts or chains, in particular for a control gear of an internal combustion engine, comprising a tension roller (2) mounted on a tension roller support (3) of eccentric configuration which in turn is guided on an eccentric inner component which can be screwed onto a housing (20), the tensioner (1) further comprising a spring (12, 29) resiliently urging the tension roller support (3) against the housing (20), characterized in that the inner component comprises a flanged eccentric bush (5) which engages freely rotatable into a base plate (7) which is guided by a radial guide arm (9) on the housing (20).