Abstract:
1,092,624. Grinding. C. JONES (Landis Tool Co.). Nov. 13, 1964, No. 46253/64. Heading B3D. A grinding machine for grinding cylindrical workpieces comprises a grinding wheel 12, Fig. 1, rotatably mounted on a support 11 slidably mounted on a bed 10 for movement transversely toward and from a workpiece W, feeding means for moving the support towards and from the workpiece, a dressing tool D, means 130, Fig. 3, for traversing the roller across the grinding wheel, a gauge 40 adapted to provide a signal when the workpiece has been ground to a predetermined size, and control means directly connected by a circuit to said gauge for actuating the dressing traverse in response to said signal to initiate a dressing operation immediately the workpiece is ground to said predetermined size. The feeding means for moving the support 11 consists of a piston-and-cylinder device 50, 51 for effecting a rapid movement of the support and a piston-and-cylinder device 190, 191, Fig. 5, formed with a rack 192 engaging a gear 193 on a hand wheel shaft 194 for effecting a fast and slow feed of the support. The workpiece W is mounted between a headstock 17 and a tailstock on a swivel table 16 on a carriage 15 longitudinally movable relative to the grinding wheel. A steady frame 20 is pivotally movable about a pivot 21 on the table 16 by a piston-and-cylinder device 30, 31, the frame also carrying a gauge 40. The dressing tool D is mounted at the rear of the grinding wheel and the roller 80 is carried by a shaft 90, Fig. 2, which is supported in bearings in a housing 81 and is rotated by a motor 92. The housing 81 is mounted on a bar 71 which is movable in a housing 70 towards and from the grinding wheel by a hand wheel 75 or mechanism which automatically compensates for reduction in wheel diameter. The housing 70 is movable longitudinally and transversely by means of ball guides 111, 112, Fig. 3, on a slide member 113 on a bracket 60 mounted on the machine frame. A profile bar 120 is secured to the member 113 and a follower 121 on the bar 71 is urged towards the profile bar 120 by a fluid pressure device 140, 141 and the roller is traversed past the grinding wheel by a fluid pressure device 130, 131, the profile bar and follower being so dimensioned that the roller dresses the face of the grinding wheel and forms radii on its edges. Coolant is supplied to the dressing roller by way of passages 100, 101, 102 and a cone-shaped nozzle 103. The dressing device is actuated by a relay 57CR which is connected to a selector switch 155 having four contacts 1, 2, 3 and 4, each of which is connected to a separate control means actuated at different points in the grinding operation. With the switch 155 set at contact 1, the dressing device is operative immediately the work is to size, the gauge 40 completing the circuit through contact 1 and the dressing relay 57CR. The dressing device may be operated when the grinding wheel is in its retracted position through actuation of a limit switch 1LS completing the circuit to the dressing relay 57CR through contact 2. With the selector switch set to contact 3, the dressing device is operated at the end of the rapid feed by the piston-andcylinder device 50, 51 under the control of a dashpot, the rod 52 of the piston actuating a positive stop 54 from which fluid is being discharged to increase the pressure in the circuit and actuate a pressure switch 2PS which makes a circuit through contact 3 of switch 155 and the dresser relay 57CR. The feed of the grinding wheel is continued by operation of the piston-and-cylinder device 190, 191 during the dressing operation, the dressing operation ending before or during round out as determined by a timer relay. Finally, with the selector switch set to contact 4, dressing may be effected at the end of the fast feed when the piston 191 has uncovered a port 195 so that fluid pressure can act on a pressure switch 7PS which completes a circuit through a timer and contact 4 to the dresser relay 57CR. The circuit may be arranged such that dressing is completed before further slow feed of the grinding wheel or may be effected with the slow feed. At the end of the feed by piston 191, a further port is uncovered so that fluid pressure actuates a pressure switch 3PS which operates a timer that in turn controls a pneumatically operated circuit having a piston-and-cylinder device 160, 161, movement of the piston acting through a ratchet mechanism 166 to rotate an incremental feed screw 167 of the grinding wheel.
Abstract:
A sub-sea well intervention vessel includes a dynamically positionable tanker and direct well intervention equipment mounted on the tanker deck. The intervention equipment includes drilling equipment for performing underbalanced drilling and hydrocarbon liquid separation. A separate production riser is provided so that simultaneous drilling and production can be performed via separate risers. The driller riser is selectively disconnectable from the well so that the tanker can be dynamically repositioned over the well. A turret mooring system is provided such that the production riser can remain in operation during repositioning about the turret. The hydrocarbon liquid separator is connected to a separator of the production plant.
Abstract:
The present disclosure provides a method of reducing localized fluid loss in a wellbore in a subterranean formation by injecting into the wellbore a fluid carrier phase comprising a fluid loss capsule of an active fluid loss control material. The active fluid loss control material is released in the fluid loss zone and reduces localized fluid loss within the wellbore.
Abstract:
An apparatus for isolating at least a portion of a tubular for use in a wellbore comprising a first, inner tubular in the form of carrier tube and a second, outer tubular in the form of protective shroud, coupled to the carrier tube. One or more aperture is provided in a wall of the carrier tube for permitting fluid transfer through the tube and one or more aperture is provided to permit fluid transfer through the shroud. A sealing layer is disposed on a surface of the shroud, the sealing layer defining a first configuration permitting fluid flow through the apertures and, on exposure to a selected reactant, adopting a second configuration to restrict fluid flow through the apertures, the sealing layer adapted to return from the second configuration to the first configuration where concentration of the selected reactant falls below a selected threshold.
Abstract:
A solar tracking system enables an array of solar panels to track a path of the sun. The system includes a main support arm (205) having a hub end and a distal end. A rotatable main hub (220) is attached to the hub end of the main support arm (205). A support frame (215) is rotatably attached to the distal end of the main support arm (205). A tie-rod (210, 610) includes a swivel end and a frame end, and the swivel end is rotatably positioned adjacent to the main hub (220). The frame end of the tie-rod (210, 610) is connected to the support frame (215) above the distal end of the main support arm (205), such that rotation of the main hub (220) causes a vertical orientation of the support frame (215) to change.
Abstract:
A coating composition for glass fibres intended for use as reinforcement in cementitious products is disclosed, which contains at least one monocyclic or polycyclic aromatic compound having at least three hydroxyl groups on the aromatic ring or (in a polycyclic compound) on at least one of the aromatic rings, together with at least one partially-cured A-stage phenolformaldehyde resin of the water-dilutable resole type.
Abstract:
Colic can be a particular problem for babies feeding on liquid feed from a feeder bottle. The colic can be formed by air from various sources in the liquid feed. Typically, there is less air in the liquid feed towards the bottom of the liquid feed container in the feeding position than towards the top of the liquid feed. The present invention provides apparatus for drawing milk from the bottom of the feeding apparatus chamber when the feeder is held in the operating position. This is achieved by positioning a flow restrictor for allowing the passage of liquid feed from a main chamber into a flexible feeding teat at a suitable location. The present invention also provides a resiliently-biased cartridge to assist in priming and/or draining of the flexible feeding teat. The present invention also provides a construction in which the flow restrictor is always provided in the correct position regardless of the relative angular orientation of the elements of the feeder. The present invention also provides feeding apparatus that can be easily disassembled to facilitate cleaning.
Abstract:
An apparatus 30 for isolating at least a portion of a tubular for use in a wellbore comprising a first, inner tubular in the form of carrier tube 32 and a second, outer tubular in the form of protective shroud 34, coupled to the carrier tube 32. One or more aperture 46 is provided in a wall of the carrier tube 32 for permitting fluid transfer through the tube 32 and one or more aperture 50 is provided to permit fluid transfer through the shroud 34. A seal member in the form of a sealing layer 36 is disposed on a surface of the shroud 34, the sealing layer 36 defining a first configuration permitting fluid flow through the apertures 46,50 and, on exposure to a selected reactant, adopting a second configuration to restrict fluid flow through the apertures 46, 50, the sealing layer 36 adapted to return from the second configuration to the first configuration where concentration of the selected reactant falls below a selected threshold. A method for producing an apparatus for isolating at least a portion of a tubular is also disclosed.
Abstract:
A modular unit (1) for transporting work pieces (40) and suitable for use in an array of such units, comprises a top (5); transportation means (10) which propel the work pieces onto and/or off said top (10) and against which the work pieces rest when located on the top (5) of the unit, the transportation means (10) being part of said top (5); in which the transportation means occupy one or more regions of the top (5) of the unit (1) whilst one or more remaining regions of the top are not occupied by transportation means (10) but are suitable for receiving a work piece treatment device.