US3889928A - Winch with constant tension cable - Google Patents

Winch with constant tension cable Download PDF

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US3889928A
US3889928A US423528A US42352873A US3889928A US 3889928 A US3889928 A US 3889928A US 423528 A US423528 A US 423528A US 42352873 A US42352873 A US 42352873A US 3889928 A US3889928 A US 3889928A
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cable
constant
reel
winch
rotor
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US423528A
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Pierre Y David
Joel M Charles
Robert Julien Antoine Toscano
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Etat Francais
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Etat Francais
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B66D1/48—Control devices automatic
    • B66D1/50—Control devices automatic for maintaining predetermined rope, cable, or chain tension, e.g. in ropes or cables for towing craft, in chains for anchors; Warping or mooring winch-cable tension control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B66D1/48—Control devices automatic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00—Capstans, winches or hoists
    • B66D2700/01—Winches, capstans or pivots
    • B66D2700/0108—Winches, capstans or pivots with devices for paying out or automatically tightening the cable

Definitions

  • ABSTRACT A winch comprising a rotatable reel on which the cable can be wound and unwound, a rotatable guide pulley on which the cable passes from the reel to a load, a drive shaft driven at a substantially constant speed, and an eddy current electro brake coupling the reel and drive shaft to transmit a substantially constant torque therebetween while permitting relative limited angular rotation.
  • a second eddy current electro brake is connected between the guide pulley and a stationary [56] References Cited UNITED STATES PATENTS Support- 2,306,045 12/1942 Delano 242/155 MC 3 Claims, 3 Drawing Figures u /4 T 6 3a 4 a i 5 B 21 1 WINCH WITH CONSTANT TENSION CABLE FIELD OF THE INVENTION
  • the present invention relates to a constant tension winch driven by a constant speed drive means and associated methods.
  • the wind. of the invention is adapted for use in hauling or hoisting apparatus.
  • a specific but non-limiting embodiment of a winch according to the invention is one for hauling or lifting a floating load by means of a cable wound on said winch which is placed on a ship, a river bank or a pontoon.
  • the floating load follows the swelling and surging movements of the water and thus undergoes relative movement with respect to the winch which is fixed or only follows the swelling and surging movements of the water to a much reduced degree.
  • An object of the invention is to provide a winch which avoids production of large forces in the cable and maintains the cable at substantially constant tension without utilizing any intermediary equipment between the winch and the load, but while using a drive of constant speed.
  • the winch according to the invention is of the type comprising a reel and a guide pulley for the cable.
  • the reel is driven via an eddy current electro brake whose rotor is fed by a constant intensity current, the rotor being secured to said reel and the stator to a motor shaft driven at constant speed.
  • the guide pulley is secured to the stator of a second eddy current brake motor whose rotor is fixed to the casing of the winch and fed by a constant intensity current.
  • Eddy current electro brakes are well known and composed of a rotor with a coil adapted to produce a magnetic field and a stator in which eddy currents are developed which absorb energy and produce a brakage of the rotor.
  • the invention is directed to an apn ication of such electro brakes as coupling members.
  • W hen the rotor of the electro brake is fed with a current of constant intensity, the torque which is transmitted remains constant over a range of relative speed between the stator and rotor, for example between 2000 and 4000 rpm.
  • the winch can rotate at speeds of about 1000 rpm greater and lower than this speed i.e. between 2000 and 4000 rpm without substantial variation of the torque and hence with constant tension in the cable.
  • the cable therefore can be wound or unwound according to the movements of the load while remaining constantly taut and subjected to a constant tension.
  • the speed variation corresponding to winding and unwinding of the cable will be between i 6 meters per second which encompasses prevailing increasing or decreasing speeds due to swell or surge.
  • the guide pulley of the cable is disposed at the discharge end of the reel and is braked by an electro S brake, said guide pulley being effective to the operation to assure constant tension in the cable while preventing slack between the reel and the pulley.
  • FIG. 1 is a longitudinal sectional view of an embodiment of the invention
  • FIG. 2 is a plan view thereof
  • FIG. 3 is a transverse sectional view thereof.
  • the reference character 1 represents a chassis for a winch formed of a base composed of channel members. At the two extremities of the chassis there are mounted flanges 2a and 2! serving as bearing supports and having respective bores 3a, 3b in which are lodged roller bearings 4 and 5 respectively.
  • the bearing 4 supports a drive shaft II and the bearing 5 supports a shaft 13 of a reel 14 of a winch.
  • the flange 2b is provided with a second bore in which a roller bearing 7 is mounted which supports one end of a threaded shaft 8, the other end of shaft 8 being supported in a roller bearing 10 mounted in a flange 9 secured to chassis l.
  • the shaft 8 carries a cable distributor 22.
  • Numeral 6 designates a drive pulley on the drive shaft 11.
  • Numeral represents an eddy current electro brake which serves as a synchronous electromagnetic coupler between drive shaft 1] and reel 14. This type of electro brake is well known in the art and will not be described in detail.
  • FIG. 1 shows the collector 17 of the rotor and the electrical feed terminals 18.
  • a toothed wheel 19 is fixed between the reel 14 and the collector 17.
  • the wheel 19 is in mesh with a pinion 20 keyed on shaft 8.
  • the cable distributor 22 is constituted by a nut 23 mounted on the threaded portion of shaft 8 and carrying a pulley 24 provided with a groove in which the cable 16 passes.
  • the nut 23 has an integral stub shaft 28 which is slidably mounted in guides 34 to prevent turning of the nut. When the reel rotates, it entrains the shaft 8 in rotation and the nut 23 travels axially along the shaft. The pulley 24 therefore causes the cable 16 to be wound onto or unwound from the reel in regular fashion.
  • FIG. 3 shows a guide pulley 51 for the cable I6.
  • the cable 16 passes in the groove of pulley 51 and it is maintained thereat by a pulley 44 under the bias of spring 39 acting on pulley 44.
  • Pulley 51 serves as a brake for cable winding. Pulley S1 is mounted on a shaft 40. An eddy current electro brake 54 of the same type as that discussed above is utilized and the stator of the brake 54 is keyed on shaft 40 while the rotor 48 is fixed to a plate 55 secured to the chassis.
  • the cable 16 has a diameter of 4 mm. It is wound for only one single turn on the reel whose exterior diameter is [60 mm. The length of the cable is about 30 meters.
  • the recall force exerted by the cable 6 is about 500 Newtons.
  • the pulley 6 is driven at a speed of 3000 rpm.
  • the torque exerted on the reel remains substantially constant even though the relative speed between the rotor and the stator of the coupler can vary by l000 rpm in either direction, i.e. be in the range between 2000 and 4000 rpm.
  • Such a winch therefore maintains a constant tension in the cable even if the winch and the load connected to the cable are subject to a relative movement as long as the speed of winding of the winch is between i 1000 rpm of that of the drive shaft which speeds corresponds to a variation of speed of winding of the cable between t 6 meters/second, the cable therefore being able to unwind or wind up to follow the movements of the load and avoid high stress while the pulley 6 continues to turn always in the same direction and at the same speed.
  • This range of speed of i 6 meters/second incorporates the current speeds which are met in the case of a craft which follows the movement of swelling and surging of the water.
  • a specific application of the winch conforming to the invention is a hauling winch for a floating load to bring the load under a lifting grapple which is the subject of separate application Ser. Nos. 278.798 and 797 filed Aug. 8, 1972.
  • the relative movement of the hoisting apparatus and the floating load due to sea swell are absorbed by the winding and unwinding of the cable without modification of the force of the hoisting apparatus.
  • a constant tension winch for drawing a cable with a load comprising, in combination:
  • constant speed drive means comprising a drive shaft with continuous constant rotation in the same direction independent of whether the cable is wound or unwound;
  • an eddy current electrobrake including a spooled rotor secured to said reel and a stator secured to said drive shaft, the rotor being supplied with current;
  • a constant tension winch for hauling or hoisting a cable with a floating load comprising, in combination,
  • constant speed drive means comprising a drive shaft with continuous constant rotation in the same direction independent of whether the cable is wound or unwound;
  • an eddy current electrobrake including a spooled rotor secured to said reel and a stator secured to said drive shaft, the rotor being supplied with current;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)

Abstract

A winch comprising a rotatable reel on which the cable can be wound and unwound, a rotatable guide pulley on which the cable passes from the reel to a load, a drive shaft driven at a substantially constant speed, and an eddy current electro brake coupling the reel and drive shaft to transmit a substantially constant torque therebetween while permitting relative limited angular rotation. A second eddy current electro brake is connected between the guide pulley and a stationary support.

Description

United States Patent David et a1.
WINCH WITH CONSTANT TENSION CABLE Inventors: Pierre Y. David; .1061 M. Charles, both of La Valette; Robert Julien Antoine Toscano, La Seyne, Mer, all
of France Assignee: Etat Francais, Paris, France Filed: Dec. 10, 1973 Appl. No.: 423,528
Foreign Application Priority Data Dec. 11, 1972 France 72.43940 1 June 17, 1975 2,346,917 4/1944 Heger 242/45 2,411,094 11/1946 Johnson 254/172 2,443,763 6/1948 Dahlgren et a1. 1. 254/172 2,575,476 1 1/1951 Traitt 242/45 2,810,980 10/1957 Puretic t 1 1. 254/138 2,978,195 4/1961 Weber et a1. 1 1 242/45 3,049,308 8/1962 Lang 1 1 242/45 3,281,087 10/1966 Claiborne et a1. 242/45 3,778,003 12/1973 Godderidgc 1. 242/45 Primary Examiner-Robert J. Spar Assistant Examiner-Kenneth Noland Attorney, Agent, or Firm-Waters, Schwartz & Nisscn [57] ABSTRACT A winch comprising a rotatable reel on which the cable can be wound and unwound, a rotatable guide pulley on which the cable passes from the reel to a load, a drive shaft driven at a substantially constant speed, and an eddy current electro brake coupling the reel and drive shaft to transmit a substantially constant torque therebetween while permitting relative limited angular rotation. A second eddy current electro brake is connected between the guide pulley and a stationary [56] References Cited UNITED STATES PATENTS Support- 2,306,045 12/1942 Delano 242/155 MC 3 Claims, 3 Drawing Figures u /4 T 6 3a 4 a i 5 B 21 1 WINCH WITH CONSTANT TENSION CABLE FIELD OF THE INVENTION The present invention relates to a constant tension winch driven by a constant speed drive means and associated methods.
The wind. of the invention is adapted for use in hauling or hoisting apparatus.
BACKGROUND A specific but non-limiting embodiment of a winch according to the invention is one for hauling or lifting a floating load by means of a cable wound on said winch which is placed on a ship, a river bank or a pontoon. In such case, the floating load follows the swelling and surging movements of the water and thus undergoes relative movement with respect to the winch which is fixed or only follows the swelling and surging movements of the water to a much reduced degree.
PRIOR ART The hauling or hoisting of a floating load is a problem which is difficult to solve and currently a number of complex arrangements have been proposed for interpositioning between the winch and the load to compensate for the relative movements therebetween and to eliminate any substantial tension in the connecting cable which could cause rupture thereof.
SUMMARY OF THE INVENTION An object of the invention is to provide a winch which avoids production of large forces in the cable and maintains the cable at substantially constant tension without utilizing any intermediary equipment between the winch and the load, but while using a drive of constant speed.
The winch according to the invention is of the type comprising a reel and a guide pulley for the cable.
The reel is driven via an eddy current electro brake whose rotor is fed by a constant intensity current, the rotor being secured to said reel and the stator to a motor shaft driven at constant speed. The guide pulley is secured to the stator of a second eddy current brake motor whose rotor is fixed to the casing of the winch and fed by a constant intensity current.
Eddy current electro brakes are well known and composed of a rotor with a coil adapted to produce a magnetic field and a stator in which eddy currents are developed which absorb energy and produce a brakage of the rotor.
The invention is directed to an apn ication of such electro brakes as coupling members. W hen the rotor of the electro brake is fed with a current of constant intensity, the torque which is transmitted remains constant over a range of relative speed between the stator and rotor, for example between 2000 and 4000 rpm.
If the drive shaft rotates at a constant speed of 3000 rpm, the winch can rotate at speeds of about 1000 rpm greater and lower than this speed i.e. between 2000 and 4000 rpm without substantial variation of the torque and hence with constant tension in the cable.
The cable therefore can be wound or unwound according to the movements of the load while remaining constantly taut and subjected to a constant tension.
With a reel of conventional diameter, the speed variation corresponding to winding and unwinding of the cable will be between i 6 meters per second which encompasses prevailing increasing or decreasing speeds due to swell or surge.
The guide pulley of the cable is disposed at the discharge end of the reel and is braked by an electro S brake, said guide pulley being effective to the operation to assure constant tension in the cable while preventing slack between the reel and the pulley.
The characteristic features of the invention will next become apparent from the following description of an embodiment thereof given by way of example and not of limitation with reference to the attached drawing.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a longitudinal sectional view of an embodiment of the invention;
FIG. 2 is a plan view thereof; and
FIG. 3 is a transverse sectional view thereof.
DETAILED DESCRIPTION In the drawing, the reference character 1 represents a chassis for a winch formed of a base composed of channel members. At the two extremities of the chassis there are mounted flanges 2a and 2!) serving as bearing supports and having respective bores 3a, 3b in which are lodged roller bearings 4 and 5 respectively. The bearing 4 supports a drive shaft II and the bearing 5 supports a shaft 13 of a reel 14 of a winch.
The flange 2b is provided with a second bore in which a roller bearing 7 is mounted which supports one end of a threaded shaft 8, the other end of shaft 8 being supported in a roller bearing 10 mounted in a flange 9 secured to chassis l. The shaft 8 carries a cable distributor 22.
Numeral 6 designates a drive pulley on the drive shaft 11.
Numeral represents an eddy current electro brake which serves as a synchronous electromagnetic coupler between drive shaft 1] and reel 14. This type of electro brake is well known in the art and will not be described in detail.
The stator of the coupler is keyed on the drive shaft 11. The rotor is secured to the reel 14 by the screws I2. FIG. 1 shows the collector 17 of the rotor and the electrical feed terminals 18.
A toothed wheel 19 is fixed between the reel 14 and the collector 17. The wheel 19 is in mesh with a pinion 20 keyed on shaft 8.
The cable distributor 22 is constituted by a nut 23 mounted on the threaded portion of shaft 8 and carrying a pulley 24 provided with a groove in which the cable 16 passes. The nut 23 has an integral stub shaft 28 which is slidably mounted in guides 34 to prevent turning of the nut. When the reel rotates, it entrains the shaft 8 in rotation and the nut 23 travels axially along the shaft. The pulley 24 therefore causes the cable 16 to be wound onto or unwound from the reel in regular fashion.
FIG. 3 shows a guide pulley 51 for the cable I6. The cable 16 passes in the groove of pulley 51 and it is maintained thereat by a pulley 44 under the bias of spring 39 acting on pulley 44.
Pulley 51 serves as a brake for cable winding. Pulley S1 is mounted on a shaft 40. An eddy current electro brake 54 of the same type as that discussed above is utilized and the stator of the brake 54 is keyed on shaft 40 while the rotor 48 is fixed to a plate 55 secured to the chassis.
According to a non-limiting example. the cable 16 has a diameter of 4 mm. It is wound for only one single turn on the reel whose exterior diameter is [60 mm. The length of the cable is about 30 meters.
The recall force exerted by the cable 6 is about 500 Newtons. The pulley 6 is driven at a speed of 3000 rpm.
When the electro brake I5 is fed with constant current, the torque exerted on the reel remains substantially constant even though the relative speed between the rotor and the stator of the coupler can vary by l000 rpm in either direction, i.e. be in the range between 2000 and 4000 rpm.
Such a winch therefore maintains a constant tension in the cable even if the winch and the load connected to the cable are subject to a relative movement as long as the speed of winding of the winch is between i 1000 rpm of that of the drive shaft which speeds corresponds to a variation of speed of winding of the cable between t 6 meters/second, the cable therefore being able to unwind or wind up to follow the movements of the load and avoid high stress while the pulley 6 continues to turn always in the same direction and at the same speed. This range of speed of i 6 meters/second incorporates the current speeds which are met in the case of a craft which follows the movement of swelling and surging of the water.
A specific application of the winch conforming to the invention is a hauling winch for a floating load to bring the load under a lifting grapple which is the subject of separate application Ser. Nos. 278.798 and 797 filed Aug. 8, 1972. In this case, the relative movement of the hoisting apparatus and the floating load due to sea swell are absorbed by the winding and unwinding of the cable without modification of the force of the hoisting apparatus.
When the electrical energization of the coupler is terminated, a simple manual traction on the cable is stiff:- cicnt to unwind the same.
Other utilizations for such winches of constant tension can be found for all cases of hoisting or hauling by means of a cable of a load subject to oscillation movement with respect to the winch.
It is well understood that numerous modifications of the disclosed embodiment will become obvious to those skilled in the art without departing from the scope and spirit of the invention as defined in the appended claims.
What is claimed is:
l. A constant tension winch for drawing a cable with a load comprising, in combination:
a rotatable reel on which a cable can be wound or unwound, the tension of said cable being kept sub stantially constant;
constant speed drive means comprising a drive shaft with continuous constant rotation in the same direction independent of whether the cable is wound or unwound;
an eddy current electrobrake including a spooled rotor secured to said reel and a stator secured to said drive shaft, the rotor being supplied with current; and
means for keeping the intensity of said current constant,
a substantially constant torque being transmitted between said drive means and said reel over a predetermined range of relative speed between said stator and rotor.
2. A constant tension winch as claimed in claim 1 wherein said range of relative speed is between 2000 and 4000 rpm.
3. A constant tension winch for hauling or hoisting a cable with a floating load comprising, in combination,
a rotatable reel on which a cable can be wound or un wound, the tension of said cable being kept substantially constant,
constant speed drive means comprising a drive shaft with continuous constant rotation in the same direction independent of whether the cable is wound or unwound;
an eddy current electrobrake including a spooled rotor secured to said reel and a stator secured to said drive shaft, the rotor being supplied with current; and
means for keeping the intensity of said current constant,
a substantially constant torque being transmitted between said drive means and said reel over a predetermined range of relative speed between said stator and rotor.

Claims (3)

1. A constant tension winch for drawing a cable with a load comprising, in combination: a rotatable reel on which a cable can be wound or unwound, the tension of said cable being kept substantially constant; constant speed drive means comprising a drive shaft with continuous constant rotation in the same direction independent of whether the cable is wound or unwound; an eddy current electrobrake including a spooled rotor secured to said reel and a stator secured to said drive shaft, the rotor being supplied with current; and means for keeping the intensity of said current constant, a substantially constant torque being transmitted between said drive means and said reel over a predetermined range of relative speed between said stator and rotor.
2. A constant tension winch as claimed in claim 1 wherein said range of relative speed is between 2000 and 4000 rpm.
3. A constant tension winch for hauling or hoisting a cable with a floating load comprising, in combination, a rotatable reel on which a cable can be wound or unwound, the tension of said cable being kept substantially constant, constant speed drive means comprising a drive shaft with continuous constant rotation in the same direction independent of whether the cable is wound or unwound; an eddy current electrobrake including a spooled rotor secured to said reel and a stator secured to said drive shaft, the rotor being supplied with current; and means for keeping the intensity of said current constant, a substantially constant torque being transmitted between said drive means and said reel over a predetermined range of relative speed between said stator and rotor.
US423528A 1972-12-11 1973-12-10 Winch with constant tension cable Expired - Lifetime US3889928A (en)

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FR7243940A FR2209709B1 (en) 1972-12-11 1972-12-11

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057601A2 (en) * 1981-01-29 1982-08-11 Sykes Pumps Limited Improvements in and relating to winches
US20070045073A1 (en) * 2005-08-25 2007-03-01 Chengxin Cao Reel apparatus
US20120318609A1 (en) * 2010-02-01 2012-12-20 R.I.D.E. Inc. Movable cable loop descent system
CN107500165A (en) * 2017-08-17 2017-12-22 武汉船用机械有限责任公司 A kind of winch pre-tightening apparatus

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306045A (en) * 1940-10-11 1942-12-22 Delano Patents Company Spooling device for wire
US2346917A (en) * 1942-12-08 1944-04-18 Western Electric Co Take-off and tensioning device for strand supplies
US2411094A (en) * 1941-09-09 1946-11-12 Almon A Johnson Winch for towing and the like
US2443763A (en) * 1946-03-26 1948-06-22 Carnegie Illinois Steel Corp Reel motor control
US2575476A (en) * 1950-12-22 1951-11-20 American Viscose Corp Twisting and winding machine drive system
US2810980A (en) * 1956-01-23 1957-10-29 Mario J Puretic Net and long line retrieving device and method of using same
US2978195A (en) * 1955-03-31 1961-04-04 Barmag Barmer Maschf Means for controlling filament tension in winding apparatus
US3049308A (en) * 1960-01-21 1962-08-14 Nat Standard Co Festoon control system for haul-off apparatus
US3281087A (en) * 1964-03-27 1966-10-25 Dixie Yarns Winding of yarns of high elasticity
US3778003A (en) * 1971-01-15 1973-12-11 J Godderidge Spooling device for unwinding wire

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE668346C (en) * 1936-11-12 1938-12-01 Maschf Augsburg Nuernberg Ag Winch with winding device to prevent slack rope

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306045A (en) * 1940-10-11 1942-12-22 Delano Patents Company Spooling device for wire
US2411094A (en) * 1941-09-09 1946-11-12 Almon A Johnson Winch for towing and the like
US2346917A (en) * 1942-12-08 1944-04-18 Western Electric Co Take-off and tensioning device for strand supplies
US2443763A (en) * 1946-03-26 1948-06-22 Carnegie Illinois Steel Corp Reel motor control
US2575476A (en) * 1950-12-22 1951-11-20 American Viscose Corp Twisting and winding machine drive system
US2978195A (en) * 1955-03-31 1961-04-04 Barmag Barmer Maschf Means for controlling filament tension in winding apparatus
US2810980A (en) * 1956-01-23 1957-10-29 Mario J Puretic Net and long line retrieving device and method of using same
US3049308A (en) * 1960-01-21 1962-08-14 Nat Standard Co Festoon control system for haul-off apparatus
US3281087A (en) * 1964-03-27 1966-10-25 Dixie Yarns Winding of yarns of high elasticity
US3778003A (en) * 1971-01-15 1973-12-11 J Godderidge Spooling device for unwinding wire

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057601A2 (en) * 1981-01-29 1982-08-11 Sykes Pumps Limited Improvements in and relating to winches
EP0057601A3 (en) * 1981-01-29 1982-10-27 Sykes Pumps Limited Improvements in and relating to winches
US20070045073A1 (en) * 2005-08-25 2007-03-01 Chengxin Cao Reel apparatus
US20120318609A1 (en) * 2010-02-01 2012-12-20 R.I.D.E. Inc. Movable cable loop descent system
US9272166B2 (en) * 2010-02-01 2016-03-01 Ride Inc. Movable cable loop descent system
US10086853B2 (en) * 2010-02-01 2018-10-02 Ride, Inc. Movable cable loop descent system
CN107500165A (en) * 2017-08-17 2017-12-22 武汉船用机械有限责任公司 A kind of winch pre-tightening apparatus

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DE2361598A1 (en) 1974-06-12
GB1414387A (en) 1975-11-19
FR2209709B1 (en) 1976-01-30
FR2209709A1 (en) 1974-07-05

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