Patents Assigned to Continental Emsco Company
  • Patent number: 5984586
    Abstract: A mooring unit and method of retrofitting a mooring unit are provided. Certain existing combination mooring units, of the type having two wire rope drums and two wildcats, are experiencing increased winch drive train component stress levels during operation when used in water deeper than they were designed for. Existing units are modified by providing left and right twin drum traction winch assemblies and additional winches. The existing wire rope drums are discarded, or reused with the additional winches. The additional winches are preferably mounted below the mooring unit. The twin drum traction winch assemblies, which deliver a constant winch pull force, are vertically mounted within the support flanges where the removed wire rope drums were previously mounted, without any modification to the support flanges.
    Type: Grant
    Filed: February 4, 1998
    Date of Patent: November 16, 1999
    Assignee: Continental Emsco Company
    Inventor: Donald J. Wudtke
  • Patent number: 5951061
    Abstract: An elastomeric flex joint is provided with a rotational bearing so that torsional stress is relieved by slip of the rotational bearing. In a first embodiment, the flex joint is designed to resist flexing from a mean position at which there is a substantial bend of axial direction, and the rotational bearing does not normally slip. An adjustment mechanism reduces the loading on the elastomeric flex element and the rotational bearing so that the bearing will slip during an initial orientation or during an adjustment of the joint. In a second embodiment, all small torsional deflections are absorbed by the elastomeric flex element, and large torsional deflections are absorbed by the rotational bearing. This is desirable because the elastomeric flex element has a greater fatigue capacity for small oscillations than the rotational bearing. An elastomeric clutch can be used to precisely control the break-out torque.
    Type: Grant
    Filed: August 13, 1997
    Date of Patent: September 14, 1999
    Assignee: Continental EMSCO Company
    Inventors: Edward J. Arlt, III, Benton Baugh, David C. Riggs
  • Patent number: 5905212
    Abstract: Force transducers are integrated in an elastomeric flex bearing to provide signals for determining the tension and torque upon a tension member coupled to the bearing and for computation of the azimuth and elevation of the tension member. Preferably the force transducers are mounted to or embedded in an outer metal load ring of the flex bearing and are bonded with the outer metal load ring to the elastomer of the flex bearing. The force transducer, for example, include a diaphragm bonded to the elastomer, and the diaphragm has a diameter in excess of the spacing between the outer metal load ring and the nearest laminated metal reinforcement of the bearing. In one embodiment, metal foil strain gages are bonded to the surface of the diaphragm opposite from the elastomer. In another embodiment, the diaphragm transmits pressure to hydraulic fluid between the diaphragm and the outer metal support ring.
    Type: Grant
    Filed: June 4, 1997
    Date of Patent: May 18, 1999
    Assignee: Continental Emsco Company
    Inventors: Charles J. Moses, Michael E. Hogan
  • Patent number: 5873678
    Abstract: Vertical movement of a floating marine platform is reduced by tendons extending from the platform to anchors on the seabed. A final tension adjustment to equalize the load on all of the tendons is made by a respective tension adjustment mechanism incorporated into the top connector of each tendon. The tension adjustment mechanism includes a split load ring assembly having an upper ring and a lower ring. The upper ring and the lower ring abut each other at respective complementary surfaces. Each surface has a series of serrated ramps. A rotation of one ring with respect to the other causes the upper ring to climb over the lower ring to thereby increase the tension in the tendon. Rotation of the upper ring with respect to the lower ring, for example, is achieved by a motor driven gear ring.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: February 23, 1999
    Assignee: Continental Emsco Company
    Inventor: Charles J. Moses
  • Patent number: 5658095
    Abstract: A riser tensioner system 10 is provided for use on offshore oil drilling platforms to support a riser 12 relative to a floating platform. The riser tensioner system 10 uses either elastomeric pads 32 or helical metal springs 100 as an energy absorbing medium, rather than hydraulic, or pneumatic systems. The elastomeric pads 32 or helical metal springs 100 are maintained in compression within a shock absorber housing 76 by a plunger 70 which is compressed by the weight of the riser 12. If the riser tensioner system 10 is arranged to place the shock absorber 20 in tension, the shock absorber plunger 70 is inverted in the housing 76 to maintain the elastomeric pads 32 or helical metal springs 100 in compression. To achieve varied response characteristics, nested inner and outer elastomeric pads 50, 52 or compression springs 102, 106 are arranged to act together.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: August 19, 1997
    Assignee: Continental EMSCO Company
    Inventors: Edward J. Arlt, Charles J. Moses
  • Patent number: 5641248
    Abstract: A compression element having a deflectable elastomeric member is disclosed. The compression element exhibits a decreasing axial spring rate in response to axial movement and compression of the deflectable member. The compression element may be used alone or in combination with other compression elements in riser tensioner systems to maintain a substantially constant upward tensioning force on a riser as it moves axially relative to a floating platform.
    Type: Grant
    Filed: April 4, 1995
    Date of Patent: June 24, 1997
    Assignee: Continental EMSCO Company
    Inventor: Edward J. Arlt, III
  • Patent number: 5628586
    Abstract: A riser tensioner system for applying a substantially constant tensioning force to a riser and allowing a floating platform to move within a given range along a longitudinal axis of the riser. The system includes a plurality of tensioner assemblies each of which are coupled to the riser and to the platform. Each of the tensioner assemblies includes an upper member, a lower member, a connecting member coupled to the upper and lower members, and intermediate members coupled to the upper and lower members at a point intermediate the ends of the upper and lower members. At least one of the upper member, the lower member, and the intermediate members are adapted to provide a constant tensioning force. The arrangement of the upper member, lower member, connecting member, and intermediate members further provide a linkage whose centerline in angularly spaced from the longitudinal axis of the riser by a substantially constant amount throughout the range of motion of the linkage.
    Type: Grant
    Filed: June 23, 1995
    Date of Patent: May 13, 1997
    Assignee: Continental Emsco Company
    Inventor: Edward J. Arlt, III
  • Patent number: 5615977
    Abstract: A continuous bend flexible/rigid riser system is provided for coupling a subsea location to an offshore platform or vessel. The riser system comprises a first rigid pipe section coupled at its upper end to the platform. A plurality of intermediate pipe sections are mutually coupled end to end, and are coupled in series with the first rigid pipe section by means of a plurality of flexible couplings. The lower end of the last in the series of intermediate pipe sections is coupled to the subsea location. The flexible/rigid riser system reduces bending stresses transmitted along the riser by allowing angular displacement of the pipe sections with respect to one another.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: April 1, 1997
    Assignee: Continental Emsco Company
    Inventors: Charles J. Moses, Rajko M. Simic
  • Patent number: 5573463
    Abstract: An elastomeric drive line coupling. The coupling includes an input drive shaft having a longitudinal axis and terminating at one end with a housing and an output drive shaft having a longitudinal axis and terminating at one end with a ball. The housing has a partially elliptical interior and the ball has a partially elliptical exterior which is disposed within the housing. A partially elliptical rigid shell is provided between the ball and the housing. Both the ball and the rigid shell are bonded with elastomeric layers forming interleaved nested ellipses within the housing. These ellipses are oriented 90.degree. out of phase from one another. Torsional loads are applied to the output drive shaft by the input drive shaft through compression deformation of the elastomeric layers as the partially elliptical rigid shell attempts to rotate relative to the housing and the ball.
    Type: Grant
    Filed: May 20, 1994
    Date of Patent: November 12, 1996
    Assignee: Continental Emsco Company
    Inventor: Edward J. Arlt
  • Patent number: 5482406
    Abstract: A compression element having a deflectable elastomeric member is disclosed. The compression element exhibits a decreasing axial spring rate in response to axial movement and compression of the deflectable member. The compression element may be used alone or in combination with other compression elements in riser tensioner systems to maintain a substantially constant upward tensioning force on a riser as it moves axially relative to a floating platform.
    Type: Grant
    Filed: April 15, 1993
    Date of Patent: January 9, 1996
    Assignee: Continental Emsco Company
    Inventor: Edward J. Arlt, III
  • Patent number: 5457841
    Abstract: A non-metallic pipeline cleaning pig for cleaning a variable diameter pipeline comprises an elongated cylindrical body, front and back cups coupled to the body, and a plurality of generally circular wiping discs coupled to the body between the cups. The wiping discs are disposed in pairs spaced apart from one another. Each disc has plurality of circumferentially spaced fingers respectively separated by a plurality of circumferentially spaced slots. Each finger has a peripheral surface of a given arc length. The number and configuration of the fingers and slots is chosen so that the sum of the arc lengths is approximately equal to the internal circumference of the smallest diameter pipe section encountered.An abrasive may be applied to the fingers to enhance the cleaning action. In addition, cleaning solvent may be jetted from behind the pig to the internal surface of the pipeline in front of the pig.
    Type: Grant
    Filed: October 13, 1994
    Date of Patent: October 17, 1995
    Assignee: Continental Emsco Company
    Inventor: Joseph R. Minton
  • Patent number: 5433423
    Abstract: To overcome problems with the pistons of an energy cell rotating and becoming misaligned with one another in response to the forces exerted on the energy cell by a riser tensioner system, a two-piece elastomeric spring is disposed about each piston to create an elastomeric strut. Each piece of the spring is composed of a plurality of elastomeric layers separated by relatively inelastic spacers. These springs facilitate the longitudinally flexing of the elastomeric strut while substantially preventing rotation and misalignment in the radial direction.
    Type: Grant
    Filed: January 10, 1994
    Date of Patent: July 18, 1995
    Assignee: Continental Emsco Company
    Inventor: Gary L. Whightsil, Sr.
  • Patent number: 5423158
    Abstract: A method and apparatus for erecting a vertical mast 10 on a drill platform 15 with minimal reliance on existing cranes. An elevator guide section 20 is first constructed on the platform 15. The elevator guide section 20 has one open side for receiving the mast top section 40, mast bottom section 70, and one or more mast intermediate sections 58A-D, all of which, have approximately the same horizontal cross section. A pair of mast elevators 28A-B are slidably coupled to the elevator guide section 20. By means of the existing platform crane, the top section 40, which has a prestrung crown block 45 and travelling block 46, is placed within the elevator guide section 20 and on the elevators 28A-B. Lifting power is transmitted to the elevators 28A-B by the existing drawworks 52 via the travelling block 46. Through a series of vertical movements of the elevators 28A-B, the top section 40 is raised and one more intermediate sections 58A-D are stacked thereunder.
    Type: Grant
    Filed: April 2, 1993
    Date of Patent: June 13, 1995
    Assignee: Continental Emsco Company
    Inventor: Theodore C. Vora
  • Patent number: 5405461
    Abstract: A sucker rod coupling 10 having a high ultimate tensile strength, resistance to corrosion, and resistance to surface cracking arising out of a method of making the sucker rod coupling 10, which employs a five-step process of forming a coupling 10. First, a hollow cylindrical core 12 from a heat treatable steel is formed. Second, a thin coating 18 of metallic alloy is applied to the outer surface of the core 12. Third, the core 12 is heat treated. Fourth, threads 20 are partially cut in the inner surface of the core 12. Fifth, the threads 20 are cold worked to transform the partially cut threads 20 into finished threads 20 and to place the thread roots 22 in compression.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: April 11, 1995
    Assignee: Continental Emsco Company
    Inventors: Dean E. Hermanson, Donald F. Hallden, Horace G. Isom
  • Patent number: 5405457
    Abstract: A sucker rod coupling 10 having a high ultimate tensile strength, resistance to corrosion, and resistance to surface cracking arising out of a method of making the sucker rod coupling 10, which employs a five-step process of forming a coupling 10. First, a hollow cylindrical core 12 from a heat treatable steel is formed. Second, a thin coating 18 of metallic alloy is applied to the outer surface of the core 12. Third, the core 12 is heat treated. Fourth, threads 20 are partially cut in the inner surface of the core 12. Fifth, the threads 20 are cold worked to transform the partially cut threads 20 into finished threads 20 and to place the thread roots 22 in compression.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: April 11, 1995
    Assignee: Continental Emsco Company
    Inventors: Dean E. Hermanson, Donald F. Hallden, Horace G. Isom
  • Patent number: 4545017
    Abstract: A well drilling apparatus includes a monitoring system for monitoring the exact elevation of the traveling block. The monitoring system detects the elevation of the traveling block by means of periodically transmitted signals which are reflected back to the monitoring system by the traveling block. The apparatus further includes a control system preferably including an industrial control digital computer which is responsive to the elevation of the traveling block and controls the drawworks of the apparatus to prevent the traveling block from crashing into the crown block or working floor. In one embodiment of the apparatus the velocity of travel of the traveling block and the load being supported by the traveling block are also monitored in order to further restrict raising and lowering of the traveling block to be maintained within predetermined safe limits of operation.
    Type: Grant
    Filed: March 22, 1982
    Date of Patent: October 1, 1985
    Assignee: Continental Emsco Company
    Inventor: Eugene M. Richardson
  • Patent number: 4537233
    Abstract: This invention provides for a loading arm for use with material handling systems and includes a support structure and an arm pivotally attached to the support structure for swivel movement in both the horizontal and vertical plane relative to the support structure.
    Type: Grant
    Filed: June 21, 1983
    Date of Patent: August 27, 1985
    Assignee: Continental Emsco Company
    Inventors: Evart. J. Vroonland, William M. Curtis
  • Patent number: 4354608
    Abstract: A motion compensation system for a crane hoist serves to assist the crane operator in safely lifting loads from the deck of a heaving work boat. The crane hook follows the motion of the load because a level of pre-tension is maintained on the line by use of a counterweight connected to the reeving system. A hydraulic cylinder connected to the counterweight provides for locking movement of the counterweight and also provides a cushion at both ends of its travel. Movement of the piston in the cylinder is controlled by a system including a check valve controlling flow between opposite ends of the cylinder which permits the reeving system to take up line. A limit switch responds to movement of the piston and counterweight near the top of their travel to actuate a light to warn the operator of a need to pay out line. As the piston and counterweight approach the bottom of their travel which indicates the load is moving upward, another limit switch actuates a light to indicate time to lift the load.
    Type: Grant
    Filed: June 8, 1979
    Date of Patent: October 19, 1982
    Assignee: Continental Emsco Company
    Inventor: Donald J . Wudtke
  • Patent number: 4341242
    Abstract: A loading arm utilizing a counterbalancing mechanism in which half sheaves are utilized to provide one interconnection between the counterbalance and the outboard arm and a member is pivotally connected to both the outboard arm and the counterbalance to provide the other interconnection between the counterbalance and outboard arm to provide for full retracted storage of the arm. Preferably, rods provide the majority of the interconnection between the outboard arm and the counterweight.
    Type: Grant
    Filed: November 3, 1980
    Date of Patent: July 27, 1982
    Assignee: Continental Emsco Company
    Inventor: Dean E. Hermanson