Abstract: A front derailleur for a bicycle as well as a system including the combination of a front derailleur and shifter. The derailleur includes a fixing member securedly attached to a seat tube of a bicycle frame through a tightening band, a chain guide and a pair of linkage members for supporting the chain guide movable in reciprocation with respect to the fixing member. Further included in the front derailleur is a spool rotatably connecting the fixing member to the chain guide whereby actuation of a shifter located remotely from the derailleur results in rotation of the spool through looped cable causing pivoting of the linkage members and movement of the chain guide in reciprocation with respect to the fixing member.
Abstract: A common problem with reverse circulation downhole hammers is retention of the sample tube that extends through the actual hammer component., There is a tendency for the sample tube to become loose in its mounting, and the resulting movement through vibration results in accelerated wear which rapidly leads to failure of the component In this application, the sample tube for use in a reverse circulation downhole hammer comprises a sample tube that has a lower end connected to a drill bit sample delivery aperture and an upper end connected to a drill string sample delivery tube. The sample tube has at least one projection intermediate the upper and lower ends of the sample tube that has a non-circular cross section extending radially from the sample tube. The projection locates within a recess that has a corresponding cross sectional shape, the recess being fixed with respect to the hammer to prevent rotation of the sample tube with respect to the hammer.
Abstract: A cutting insert for use on a milling machine including an element formed of hard material, such as carbide. The element defines a rear face, by means of which it may be mounted in position, and a front face. The front face defines, towards its lower edge, a cutting projection defining a single leading cutting edge. The front face defines a surface, which may be a curved surface, which extends rearwardly and upwardly from the cutting edge. When the cutting insert is located in abutment with an adjacent cutting insert, the upper edge of the planar front face is located immediately adjacent a forwardly extending part of the undersurface of the cutting projection of the next adjacent cutting insert.
Abstract: A pulley assembly for a driven shaft is disclosed. The pulley assembly includes a pulley to which a turning force is transferred from a driving unit; a sleeve fixedly mounted to a casing of the driven unit through which the driven shaft passes with a clearance between an outer periphery of the driven shaft and an inner periphery of the sleeve; a bearing structure for bearing the pulley rotatably about an axis of the driven shaft, the bearing structure being disposed between the pulley and the sleeve; and a torque transferring structure for transferring the turning force transferred to the pulley to the driven shaft, the torque transferring structure being interposed between the pulley and the driven shaft.
June 5, 1996
Date of Patent:
July 14, 1998
Ishikawajima-Harima Heavy Industries, Co., Ltd.
Yoshiyuki Miyagi, Moena Hori, Shigeru Takabe
Abstract: A bicycle front derailleur includes a base member for attachment to a bicycle frame, a chain guide for guiding a chain laterally inwardly and outwardly of the bicycle frame, an inner link member having a first end pivotably coupled to the base member and a second end coupled to the chain guide, an outer link member having a first end pivotably coupled to the base member and a second end coupled to the chain guide, biasing means for biasing the chain guide laterally inwardly, and an actuating arm fixed to the outer link member for integral movement therewith. The actuating arm extends laterally outwardly from the outer link member so that pulling the actuating arm upwardly causes the chain guide to move laterally outwardly.
Abstract: The invention relates to a guide arrangement 1 for a riser assembly 10 including a length of a second riser tube 6 running from a well head 2 to a surface vessel 6. First buoys 8 are provided which permit the evacuation and refilling of water to adjust the buoyancy effect and comprise a system to admit a controlled amount air or water and which are connected to the lower end of the riser assembly 10 by a first line 14 via a pulley 16 such that as the first buoys are raised the riser assembly 10 is pulled downwards towards the well head. Second buoys are provided to form a rigid frame work for the guide arrangement 1 when air has replaced the water contained therein. Support buoys 22 are connected to the first and second riser tubes 4, 8 by air line tubes 13 which enable air to be removed from and added to the support buoys 22 to adjust the amount of buoyancy they provide.
Abstract: A claw tooth rotary bit having teeth that are constructed from a hard material that is combined with a softer material so that the teeth wear unevenly as the bit is used to bore through an earth formation. Adjacent teeth may be provided with complementary patterns of hard and soft material shapes. Two adjacent teeth form a set that wear in a complementary pattern such that the high points of one tooth register with the low points of the adjacent tooth. As the bit rotates, the formation is randomly engaged by the high and low areas on the teeth to increase cutting effectiveness. The alternating layers of hard and soft material provide a self-sharpening configuration as the teeth wear unevenly. The presence of the hard material in the tooth structure improves tooth rigidity. In a preferred form, the hard material is a polycrystalline diamond while the softer material is steel.
Abstract: A heavy-duty power transmission V-belt is so designed that respective upward projections each having an arcuate cross section of respective blocks are fixedly engaged with respective bottom-surface grooves each having an arcuate cross section of a tension member. The radius of curvature R2 of each bottom-surface groove is set larger than the radius of curvature R1 of the upward projection of the block (R2>R1) in the state that the tension member is put strait. Thereby, when the V-belt bends around a pulley, it can be avoided that a large local strain occurs at the bottom-surface groove. This allows a firmly fixed state of each block by the tension member to be maintained for a long time.
Abstract: A pulley, in particular for a continuously variable transmission, provided with two sheaves placed on a pulley shaft, at least one sheave being movable in the axial direction relative to the pulley shaft by movement structure. This movement structure includes at least one piston/cylinder assembly, and also fixing structure which fixes the movable sheave in the direction of rotation relative to the pulley shaft. According to the invention, the fixing structure is fitted at least inside a cylinder of the piston/cylinder assembly.
Abstract: A packer for sealing a space downhole in a well. The packer includes a deformable sheath having a body and first and second ends for defining an interior volume proximate to a tool surface. A material located within the interior volume is deformable, when the sheath second end is moved toward the sheath first end, to move the deformable sheath into the downhole space. The sheath can function as a sealing element or a backup element, and can be applied to different structures and tool configurations downhole in a wellbore. For example, the packer can be applied to plugs, to through tubing mandrals, and to other well tools in open hole or in cased wellbore configurations. The packer resists damage to the seal elements, provides confirmation of the packer setting force, and is less expensive than conventional packer designs.
Abstract: A bicycle crankset for mounting a plurality of chainrings includes a crank arm having a first end for mounting a pedal and a second end having a boss for mounting to a crank axle, a chainring retainer for supporting at least one of the plurality of chainrings, and a reinforcement member. The chainring retainer has a first engagement member for engaging the boss, and the reinforcement member includes a second engagement member for engaging the boss. The chainring retainer includes a first center ring defining the first engagement member and a plurality of first arms extending radially outwardly from the first center ring. Similarly, the reinforcement member includes a second center ring defining the second engagement member and a plurality of second arms extending radially outwardly from the second center ring. The distal ends of the plurality of first arms may be connected to corresponding distal ends of the plurality of second arms.
Abstract: A continuously variable automatic drive has a front driving sprocket and a rear driven sprocket. Each of these sprockets has a housing and a plurality of involute-shaped toothed segments, each having a leading end and a trailing free end. The toothed segments are symmetrically spaced around their housings and pivotally attached to their housings about their leading ends. Each toothed segment is movable between a first position where the trailing free end is pivoted inwardly closest to the housing and the effective diameter of the sprocket is smallest and a second position where the trailing free end is pivoted outwardly farthest from the housing and the effective diameter of the sprocket is largest. The highest gear ratio is produced when the front driving sprocket is at the second position and the rear driven sprocket at the first position. The lowest gear ratio is produced when the front driving sprocket is at the first position and the rear driven sprocket is at the second position.
Abstract: The invention relates to belt tensioning device (1) with a receiver housing (2), a roller carrier (3) connected to the receiver housing (2), a spring-loaded bearing means (5) between the receiver housing (2) and the roller carrier (3), and a spring element (6) which acts between the receiver housing (2) and the roller carrier (3) for applying a tensioning force. To simplify the structure of belt tensioning device (1) and to cut production costs, according to the invention, the spring element (6) used for spring loading of the bearing means (5) in addition to being used for applying the belt tensioning force to the pulley carrier.
December 12, 1996
Date of Patent:
June 30, 1998
Muhr und Bender
Thomas Berndt, Joachim Jud, Asmus Koch, Uirich Roth
Abstract: A Helical Bearing Anchor and Catcher for the insertion into a well conduit to anchor well equipment in both linear directions and rotation in one direction. The device has a helical groove in either the mandrel or the drag body to accommodate the helical bearing. The helical bearing has holes within it to accommodate shear pins. The shear pins translate the linear motion from the helical bearing to the drag body. The drag body has a conical surface which contacts slips to drive them outward and grip the inner well conduit wall. Once the slip grips the inner well conduit wall the mandrel and the attached well equipment can not move linearly in either direction or rotate further in the setting direction within the well conduit. The anchor catcher can be unset by rotating the mandrel in the direction opposite to the setting direction. The drag body, pins, and helical bearing all move downward away from the slip.
Abstract: A connector having dual parallel biting edges at each end of the connector for locking a portion of belting ends into the connector. The height of the biting edges and a centering ring is larger than the transverse dimension of the cylindrical body of the connector and the transverse dimension of recesses at the end portions of an endless belt. The endless belt is formed when the connector is inserted into each end of a finite length of hollow tubing or solid tubing with recesses at each end.
Abstract: A high production rate water well system combines a horizontal production liner in the aquifer with an existing vertical well or pump that extends down thereto, with one end portion of the liner passing a distance from the vertical well that does not exceed about 5% of the drainage radius of the later. High flow rate recharge also can be accomplished by the same system.
Abstract: A tensioner mechanism adapted for placing tension in a drive belt of a mower deck, the tensioner including an elongate member operatively coupled with an idler arm, and slidably mounted with a support member operatively carried by the mower deck. A compression spring carried on the elongate member between the idler arm and the support member operatively presses the idler arm away from the support member and is completely compressed during normal mowing operations for generally blocking the idler arm from swinging toward the support member during operation. A threaded member within which said elongate member is slidably received is adjustably fixed with the support member by a pair of nuts that can be adjusted on the threaded member to alter the position of the threaded member with respect to the mower deck for adjusting the tension that the idler pulley places in the belt during normal mowing operations.
Abstract: A thru tubing whipstock assembly 10 may be set within a casing string CS after passing through the lower end of a smaller diameter tubing string TS. Once set within the casing string CS, the whipstock face 18 on whipstock body 12 may divert a rotatable bit B for cutting a window in the casing string CS. The whipstock assembly 10 includes an anchor A below the whipstock body 12 for securing the set whipstock assembly within the casing string. A hinge assembly 14 below the whipstock body 12 may be pivoted from a run-in position for passing through the tubing string to a set position for positioning the whipstock face 18 for engagement with the bit B. A wedge assembly 38 is provided at the upper end of whipstock body 12 and is also movable from a run-in position to a set position.
Abstract: A crankset assembly employing a steel spider construction without adding excessive weight, and accommodating virtually unlimited combinations of bolt circle diameters and types of chain rings that include the crankset assembly. The crankset assembly may include a crank arm, a spindle piece attached to the crank arm, a radially extending spider fixed to the crankset assembly, at least two chain rings supported on the crankset assembly by the spider, and a plurality of connector elements attached to the spider at a corresponding plurality of spaced positions about the spider central axis. At least one of the chain rings is mounted to, and solely supported by, the plurality of connector elements.
Abstract: There are disclosed two embodiments of a tool for use in retrieving a cylindrical object which is stuck within a well bore, or, in the event the object cannot be retrieved, releasing therefrom to permit recovery of the tool.