EP0152420A1 - Tendeur de cable - Google Patents

Tendeur de cable

Info

Publication number
EP0152420A1
EP0152420A1 EP19840902926 EP84902926A EP0152420A1 EP 0152420 A1 EP0152420 A1 EP 0152420A1 EP 19840902926 EP19840902926 EP 19840902926 EP 84902926 A EP84902926 A EP 84902926A EP 0152420 A1 EP0152420 A1 EP 0152420A1
Authority
EP
European Patent Office
Prior art keywords
compartment
cable
tension
actuator
liquid
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.)
Pending
Application number
EP19840902926
Other languages
German (de)
English (en)
Inventor
Peter Edward Checkley
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.)
Rovert Controls (Cheltenham) Ltd
Original Assignee
Rovert Controls (Cheltenham) Ltd
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 Rovert Controls (Cheltenham) Ltd filed Critical Rovert Controls (Cheltenham) Ltd
Publication of EP0152420A1 publication Critical patent/EP0152420A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
    • F16G11/12—Connections or attachments, e.g. turnbuckles, adapted for straining of cables, ropes, or wire

Definitions

  • This invention relates to cable tensioning devices and in particular, but not exclusively, to devices for automatically controlling the tension in cables,
  • the invention consists in a cable tensioning device comprising actuator means for applying a tension to a cable and energy storage means for storing energy when the tension in the cable rises and for actuating the actuator means to tension the cable when the tension in the cable drops.
  • the actuator means is arranged to slacken the cable only when the tension in the cable rises above a predetermined level.
  • the actuator means may be extensible, for example, a piston/cylinder assembly, and the energy storage means may normally hold it in its contracted state.
  • a piston/cylinder assembly may include a liquid reservoir and the energy storage device may include a gas reservoir separated from the liquid reservoir by the movable wall, or the like, whereby movement of the piston in a sense to compress the liquid in the liquid reservoir causes movement of the wall in a sense to compress the gas in the gas reservoir.
  • the liquid reservoir may include first and second compartments and a flow-path interconnecting them. Thus extension of the actuator means may cause a reduction in volume of the second compartment and hence a flow of liquid into the two compartments.
  • the flow-path may include a valve or restriction, for example a pressure relief valve, which may be arranged such that liquid can only flow from the second compartment to the first compartment when the pressure differences between the compartments exceeds a predetermined level.
  • a separate flow-path is provided from the first to the second compartment and it may include a non-return valve or pressure reliefvalve.
  • These arrangements of flow-paths provide damping on extension and/or contraction of the actuator means, but any suitable arrangement can be utilised to provide such damping.
  • the invention consists in a tensioning device comprising an extensible actuator including a piston/cylinder assembly having first and second liquid compartments, the second compartment having a wall defined by the piston whereby extension of the actuator causes movement of the piston in a direction to reduce the volume of that compartment, a flow-path between the first and second compartments, and an energy storage device, communicating with the first compartment, for storing and releasing energy to the liquid in the first compartment in response to pressure variations therein, such that energy is stored on extension of the actuator and released to cause contraction of the actuator.
  • an extensible actuator including a piston/cylinder assembly having first and second liquid compartments, the second compartment having a wall defined by the piston whereby extension of the actuator causes movement of the piston in a direction to reduce the volume of that compartment, a flow-path between the first and second compartments, and an energy storage device, communicating with the first compartment, for storing and releasing energy to the liquid in the first compartment in response to pressure variations therein, such that energy is stored on extension of the actuator and released to cause contraction of the actuator.
  • the device may further comprise a valve for restriction in the flow-path whereby liquid flows from the second compartment to the first compartment, and hence extensible movement of the actuator can only occur when the pressure differences between the first and second compartments exceeds a predetermined level.
  • liquid can only flow from the first compartment to the second compartment when the pressure differences between them drops below a predetermined level.
  • the invention consists in an automatic cable tensioning device comprising an actuator for varying the tension in a cable in response to external 5 forces on the cable and means for inhibiting the actuator whenever the tension in the cable lies between predetermined levels.
  • Figure 2a to 2d are diagrammatic part-sectional views of the device of Figure 1 in various stages of its 15 cycle of operation;
  • Figure 3 is a scrap section showing a more detailed construction of a device of the type of Figure 1 .
  • Figure 4 is a longitudinal sectional view of a further embodiment with the cylinder and anchors omitted.
  • Figure 1 shows a cable tensioning device generally indicated at 10.
  • the device comprises a cylinder 11 and a piston 12 slidably mounted in the cylinder with its rod 13 extending through one end thereof.
  • Each of the cylinder 11 and rod 13 are provided with cable anchors 25 14 at their outer ends.
  • the piston 12 is provided with two spaced piston elements 15,16 which define two annular oil compartments
  • the first of these compartments 17 lies between the elements 15,16 and extends into the hollow piston rod 13 via passages 19,19a.
  • the hollow interior 20 of piston rod 13 is divided by a slidable wall 21 into a righthand gas reservoir 22 and a left hand oil chamber 23, which forms an extension of the first compartment.
  • the upper fluid path 24 contains a pressure relief valve 26 which incorporates a non-return valve to prevent flow along fluid path 24 from the first compartment 17 to the second compartment 18.
  • the lower fluid path 25 includes a non-return valve 27 which acts to limit flow in the first compartment/second compartment direction only.
  • the piston element 16 acts on the oil in the second compartment 18 in a sense to compress it, but because the oil is virtually incompressible there is no movement of the piston 12. If the tension on the device 10 increases, for example due to a gust of wind or contraction of the
  • OMPI type of pressure relief valve chosen.
  • the first two of these parameters also determines the drop in tension required for the device to return to its contracted position.
  • a cable tension device can be provided which will maintain the cable within a pre-determined tension range by automatically compensating for variations in the cable tension due to external environmental conditions.
  • the. return fluid path 25 may include a pressure relief valve or non-return valves may be used in both flow-paths, if an operational deadband is not required.
  • the second piston element 16 could be dispensed with and the valves 26,27 could be placed in passages 19,19a respectively or they might be placed in passages in a wall formed across chamber 23.
  • a gas energy storage device is particularly convenient,other suitable arrangements may be used and they need not necessarily be mounted in the piston rod 12.
  • Figure 3 shows a more detailed constructional view of the apparatus and it will be seen that the piston may be formed of a number of elements.
  • the two piston elements 15 and 16 may be annuli held apart by a spacer 29 and locked between a nut 30 and a seat 31 on the piston rod 13.
  • the movable wall 21 may be provided with legs 32 to prevent it closing off passages 19,19a d locking up the device.
  • Charge valves 32 may be provided in the cylinder 11 and piston rod 13 for the introduction of oil and gas.
  • Figure 4 shows an alternative embodiment wherein the sleeve valve 26 and the non-return valve 27 have been placed in a wall formed across chamber 23, as suggested above.
  • the cylinder 11 has been omitted from this figure, but it is engaged around the left-hand end of the piston 12 by means of an annular screw cap 40.
  • the piston head 41 moves within the cylinder and compresses oil within the space 18 when the cable is tensioned.
  • the compressed oil flows through transverse passages 42 into a chamber 43 which is divided from the chamber 23 by means of a wall 44.
  • a pressure relief valve 26 is connected in an aperture formed in the wall 44 and allows oil to flow from the chamber 43 to the chamber 23 once movement of the piston head 41 has
  • OMP increased the pressure in the chamber 43 to a pre ⁇ determined differential above the pressure in the chamber 23.
  • the influx of pressurised oil into the chamber 23 moves the sliding wall 21 to the right compressing the gas in the chamber 22, as previously described.
  • the non-return valve 27 is constituted by a set of return passages 45 arranged in an annular configuration in the wall 44 and a sealing washer 46 which is held to close the passages 45 by the pressure in the chamber 43.
  • the differential pressure necessary to cause movement of the washer 46 depends to a great extent on the relative areas of the faces of the washer which are acted on by the pressure in the chamber 43 and in the chamber 23, respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

Un tendeur de câble (10) comprend un cylindre (11) et un piston (12) montés de manière coulissante dans le cylindre, sa bielle (13) s'étendant au travers d'une extrémité. Le cylindre (11) ainsi que la bielle (13) sont pourvus d'ancrages (14) de câble à leurs extrémités externes. Le piston et le cylindre définissent deux compartiments d'huile (17, 18) dont le premier s'étend dans la bielle creuse (13) du piston de sorte que l'huile se trouvant dans le compartiment peut agir sur une paroi coulissante (21) pour comprimer du gaz dans un réservoir (22). Des passages d'écoulement (24, 25) sont prévus entre les deux compartiments; le passage supérieur (24) possède une soupape de décharge abaissant la pression pour permettre un écoulement depuis le second compartiment (18) vers le premier compartiment (17), tandis que le passage de fluide inférieur (25) possède une soupape de retenue permettant l'écoulement dans le sens inverse. L'application extérieure d'une tension sur le câble provoque l'extension du dispositif tendeur et la compression du gaz dans la chambre (22), de sorte que lorsque la tension est relâchée, le gaz contracte le dispositif tendeur rétablissant ainsi la tension du câble. La soupape de décharge abaissant la pression empêche une réaction instantanée de la part du dispositif tendeur ce qui permet d'avoir une zone morte empêchant d'établir des conditions d'oscillation.
EP19840902926 1983-07-29 1984-07-24 Tendeur de cable Pending EP0152420A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8320485 1983-07-29
GB08320485A GB2144198B (en) 1983-07-29 1983-07-29 A cable tensioning device

Publications (1)

Publication Number Publication Date
EP0152420A1 true EP0152420A1 (fr) 1985-08-28

Family

ID=10546486

Family Applications (2)

Application Number Title Priority Date Filing Date
EP84304998A Withdrawn EP0133768A1 (fr) 1983-07-29 1984-07-24 Dispositif tendeur de câble
EP19840902926 Pending EP0152420A1 (fr) 1983-07-29 1984-07-24 Tendeur de cable

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP84304998A Withdrawn EP0133768A1 (fr) 1983-07-29 1984-07-24 Dispositif tendeur de câble

Country Status (6)

Country Link
EP (2) EP0133768A1 (fr)
DK (1) DK140485A (fr)
FI (1) FI851235A0 (fr)
GB (1) GB2144198B (fr)
NO (1) NO851177L (fr)
WO (1) WO1985000644A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4108741A1 (de) * 1991-03-18 1992-09-24 Bundy Gmbh Rohrverbindung
US6220409B1 (en) * 1999-05-06 2001-04-24 Tenneco Automotive Inc. Stroke dependent bypass
KR100591974B1 (ko) 2005-12-05 2006-06-28 박정신 자체유압신축장치
JP5876855B2 (ja) * 2013-07-05 2016-03-02 Ｋｙｂ株式会社 流体圧シリンダ
WO2018209407A1 (fr) * 2017-05-19 2018-11-22 AME Pty Ltd Bras d'élévateur à compensation

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB545906A (en) * 1940-10-16 1942-06-18 Aircraft Components Ltd Improvements in shock-absorbers
US2417581A (en) * 1942-12-31 1947-03-18 Cons Vultee Aircraft Corp Automatically compensating cable connection
FR915184A (fr) * 1945-09-29 1946-10-29 Bofield Res And Dev Company Régulateur de tension pour câbles, notamment d'avions
US3658297A (en) * 1970-02-24 1972-04-25 William L Banks Jr Rope or cable tie including a hydraulic take-up
GB1401422A (en) * 1971-05-12 1975-07-16 Brown Brothers & Co Ltd Tow line shock absorber
FR2185093A5 (fr) * 1972-05-16 1973-12-28 Messier Hispano Sa
GB1469669A (en) * 1974-08-01 1977-04-06 Vetco Offshore Ind Inc Cylinder and piston apparatus
GB1482604A (en) * 1974-08-27 1977-08-10 Brown Bros & Co Ltd Tow line shock absorber
US4011694A (en) * 1975-11-28 1977-03-15 Formac International Inc. Method and apparatus for guying a load bearing member
GB1575307A (en) * 1977-02-25 1980-09-17 Packer M Hydraulic lifting apparatus including a hydropneumatic spring arrangement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8500644A1 *

Also Published As

Publication number Publication date
GB2144198B (en) 1987-08-19
FI851235L (fi) 1985-03-27
FI851235A0 (fi) 1985-03-27
WO1985000644A1 (fr) 1985-02-14
DK140485D0 (da) 1985-03-28
GB8320485D0 (en) 1983-09-01
DK140485A (da) 1985-03-28
NO851177L (no) 1985-03-25
EP0133768A1 (fr) 1985-03-06
GB2144198A (en) 1985-02-27

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI LU NL SE

17P Request for examination filed

Effective date: 19850725

XX Miscellaneous

Free format text: VERFAHREN ABGESCHLOSSEN INFOLGE VERBINDUNG MIT 84304998.2/0133768 (EUROPAEISCHE ANMELDENUMMER/VEROEFFENTLICHUNGSNUMMER) VOM 15.07.86.

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CHECKLEY, PETER, EDWARD