GB1413453A - Hoist with cable tensioning device - Google Patents

Hoist with cable tensioning device

Info

Publication number
GB1413453A
GB1413453A GB1393074A GB1393074A GB1413453A GB 1413453 A GB1413453 A GB 1413453A GB 1393074 A GB1393074 A GB 1393074A GB 1393074 A GB1393074 A GB 1393074A GB 1413453 A GB1413453 A GB 1413453A
Authority
GB
United Kingdom
Prior art keywords
piston
cable
load
sheave
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1393074A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB1413453A publication Critical patent/GB1413453A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/02—Devices for facilitating retrieval of floating objects, e.g. for recovering crafts from water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41572—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and an output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7052—Single-acting output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Jib Cranes (AREA)
  • Actuator (AREA)

Abstract

1413453 Cable tensioning devices WESTINGHOUSE ELECTRIC CORP 29 March 1974 [4 April 1973] 13930/74 Heading B8B [Also in Division F2] A crane (3) which is mounted on the deck of a ship (1) comprises a boom (9) which is raised and lowered by means of a cable (15) wound on a drum (13) and a load lifting cable (23) which extends from a motor-driven hoist drum (7) and passes about a sheave (17) at the upper end of the boom (9) and then passes about a sheave 21 mounted on the piston-rod 37 of a ram (19) which is used to maintain a predetermined tension in the cable (23) during raising and lowering of a load (25), the cable (23) passing from the sheave 21 back to a second sheave (17) at the upper end of the boom (9) and then passing vertically downwardly to the load (25), Fig. 1 (not shown). The ram (19) is shown in Fig. 3 and consists of a housing 31 in which a first piston 33 is displaceable, the piston 33 dividing the housing 31 into chambers 39, 47, there being a piston-rod 37 extending from the piston 33 which carries the sheave 21, and a second piston 35 is located for movement between the end of the housing 31 and the first piston 33. A cylinder of pressurized gas 71 is connected by a conduit 73 to a gas inlet port 53 in the housing 31 and an adjustable pressure regulating valve 75 in the conduit 73 is adjusted to a predetermined pressure depending on the load to be lifted, and on opening a valve 77 in the conduit 73 pressurized gas is admitted to the chamber 39 and passes through openings 49 in the piston 33 to the chamber 47, the gas reacting on the piston 33 so that as a load is lifted through the water the pressurized gas absorbs shock and moves the piston 33, and thus the piston-rod 37 and sheave 21 in and out to pay out and take up the cable 23 thus keeping a generally constant tension in the cable 23. The volume of gaseous fluid in the system can be altered by means of an expansion chamber 85 which is connected to, and is filled by, the gas cylinder 71 simultaneously with the supply of gas to the chambers 39, 47. After the load has been lifted from the water additional lifting capacity is required due to the loss of buoyancy and by admitting hydraulic fluid from a reservoir 61 through an hydraulic control valve 67 and through a fluid inlet port 51 into a chamber 45 defined by the housing 31 and a second floating piston 35, the said piston 35 is moved towards the piston 33 to cause extension of the piston-rod 37, thereby raising the load. During this latter mode of operation the hoist drum (7) may be locked to prevent the paying out of the cable (23).
GB1393074A 1973-04-04 1974-03-29 Hoist with cable tensioning device Expired GB1413453A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US347980A US3871527A (en) 1973-04-04 1973-04-04 Ram tensioning device

Publications (1)

Publication Number Publication Date
GB1413453A true GB1413453A (en) 1975-11-12

Family

ID=23366144

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1393074A Expired GB1413453A (en) 1973-04-04 1974-03-29 Hoist with cable tensioning device

Country Status (8)

Country Link
US (1) US3871527A (en)
JP (1) JPS49135352A (en)
DE (1) DE2414181A1 (en)
ES (1) ES424907A1 (en)
FR (1) FR2224395B1 (en)
GB (1) GB1413453A (en)
IT (1) IT1009663B (en)
NL (1) NL7404226A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179233A (en) * 1977-07-14 1979-12-18 National Advanced Drilling Machines, Inc. Vertical motion compensated crane apparatus

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1505645A (en) * 1974-07-30 1978-03-30 Stothert & Pitt Ltd Apparatus for use in raising or lowering a load in a condition of relative motion
US4021019A (en) * 1975-03-24 1977-05-03 British Columbia Research Council Heave compensating cranes
US4050359A (en) * 1975-09-04 1977-09-27 Brunswick Corporation Hydraulic power trim and power tilt system supply
US4005780A (en) * 1975-11-10 1977-02-01 The Manitowoc Company, Inc. Boom stop and back hitch compensating system
US4145959A (en) * 1977-02-23 1979-03-27 Teledyne Mccormick Selph, An Operating Division Of Teledyne Industries, Inc. Constant speed actuator
NL167132C (en) * 1977-05-09 1981-11-16 Hydraudyne Bv DEVICE FOR HANGING A LOAD FROM A VESSEL UNDER THE WATERLINE.
DE2748674A1 (en) * 1977-10-29 1979-05-10 Hydraulik Brattvaag As Rough sea load transfer unit - subjects crane hook to wave movement in synchronism with relative movement
US4268013A (en) * 1978-06-12 1981-05-19 Nl Industries, Inc. Crane motion compensator
US4354608A (en) * 1979-06-08 1982-10-19 Continental Emsco Company Motion compensator and control system for crane
FR2494244A1 (en) * 1980-11-17 1982-05-21 Bretagne Atel Chantiers Crane for lifting and depositing loads - has hydraulic crane cable actuator operative to compensate between two relatively vertically movable support surfaces e.g. dock and ship
FR2496624A1 (en) * 1980-12-23 1982-06-25 Bretagne Atel Chantiers DEVICE FOR SHOCK ABSORBING BETWEEN A LOAD AND A FLOATING SUPPORT AT THE TIME OF REMOVAL OF THE LOAD
US4516473A (en) * 1981-05-07 1985-05-14 Shokestu Kinzoku Kogyo Kabushiki Kaisha Cylinder driving system
US4494631A (en) * 1982-09-27 1985-01-22 Sloan Valve Company Combination air cylinder and hydraulic slack adjuster
DE3430085A1 (en) * 1984-08-16 1986-02-27 PHB Weserhütte AG, 5000 Köln PLASTIC-ELASTIC SLIDING JOINT TO BE INSERTED INTO THE LOAD ROPE OF LIFTS
US4688764A (en) * 1984-10-31 1987-08-25 Nl Industries, Inc. Crown block compensator
US4850571A (en) * 1988-04-11 1989-07-25 United States Of America Connector assembly
US5140894A (en) * 1991-01-16 1992-08-25 Axelson, Inc. Gas spring actuator
US5965994A (en) * 1997-06-20 1999-10-12 Seo; Dong Il Automatic vertical moving systems and control methods therefor
GB0205252D0 (en) * 2002-03-06 2002-04-17 Stolt Offshore Ltd Method and apparatus for deploying articles deep waters
NL1023814C2 (en) * 2003-07-03 2005-01-04 Itrec Bv Hydraulic crane for e.g. boat, has pressure regulating valve in line between hydraulic devices connected to chamber pressure and top cable load sensors
US7389973B1 (en) * 2007-02-15 2008-06-24 Samson Rope Technologies Tensioning systems and methods for line spooling
GB0705110D0 (en) * 2007-03-16 2007-04-25 Lewis Ltd Wireline intervention system
NO334789B1 (en) * 2011-04-04 2014-05-26 Rolls Royce Marine As Device for tensioning a rope or cable
US8770272B2 (en) 2011-05-18 2014-07-08 Halliburton Energy Services, Inc. Managing tensile forces in a cable
US9174705B2 (en) * 2013-04-11 2015-11-03 Terje W. Eilertsen Compensated lashing of tender assist drilling unit to a floating production facility
CN109399456B (en) * 2017-08-18 2020-05-19 天海融合防务装备技术股份有限公司 Hoisting equipment with lifting rope motion sensing mechanism and hoisting control method thereof
US10669137B2 (en) * 2017-09-25 2020-06-02 Wt Industries, Llc Heave compensation system
CN109230904B (en) * 2018-08-14 2023-11-03 中国南方电网有限责任公司超高压输电公司广州局海口分局 Cable direction follow-up ROV winch applied to unpowered positioning mother ship

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2588037A (en) * 1950-09-30 1952-03-04 Orton Crane & Shovel Company Tagline mechanism
US2897907A (en) * 1955-08-31 1959-08-04 Jersey Prod Res Co Weight handling mechanism
US3265218A (en) * 1963-02-07 1966-08-09 Giovannetti Macchine S P A Side boom pipe layer
DE1301026B (en) * 1964-11-14 1969-08-14 Reinhard Hoernlein Kg Holz Und Hydropneumatic lifting unit, especially for height-adjustable tables and chairs
US3311351A (en) * 1966-02-02 1967-03-28 William W Blakely Shock absorbing device
GB1232598A (en) * 1967-11-13 1971-05-19
NL140448B (en) * 1969-04-24 1973-12-17 Ihc Holland Nv PNEUMATIC IMPACT TOOL.
US3719041A (en) * 1971-02-05 1973-03-06 Secr Defence Temperature-responsive control for gas turbine engines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179233A (en) * 1977-07-14 1979-12-18 National Advanced Drilling Machines, Inc. Vertical motion compensated crane apparatus

Also Published As

Publication number Publication date
ES424907A1 (en) 1976-06-01
JPS49135352A (en) 1974-12-26
US3871527A (en) 1975-03-18
FR2224395B1 (en) 1978-01-13
DE2414181A1 (en) 1974-10-24
NL7404226A (en) 1974-10-08
FR2224395A1 (en) 1974-10-31
IT1009663B (en) 1976-12-20

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee