US3764111A - Free fall circuit for hydraulic winch - Google Patents

Free fall circuit for hydraulic winch Download PDF

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Publication number
US3764111A
US3764111A US00192097A US3764111DA US3764111A US 3764111 A US3764111 A US 3764111A US 00192097 A US00192097 A US 00192097A US 3764111D A US3764111D A US 3764111DA US 3764111 A US3764111 A US 3764111A
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United States
Prior art keywords
valve
sensing
line
clutch
safety
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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 - Lifetime
Application number
US00192097A
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English (en)
Inventor
R Dummer
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NORTHWEST ENGINEERING Co A CORP OF
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Bucyrus Erie Co
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Publication date
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Publication of US3764111A publication Critical patent/US3764111A/en
Assigned to NORTHWEST ENGINEERING COMPANY A CORP OF DE reassignment NORTHWEST ENGINEERING COMPANY A CORP OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BUCYRUS-ERIE COMPANY
Anticipated expiration legal-status Critical
Assigned to IBJ SCHRODER BANK & TRUST COMPANY reassignment IBJ SCHRODER BANK & TRUST COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TEREX CORPORATION
Assigned to TEREX CORPORATION reassignment TEREX CORPORATION RELEASE OF SECURITY INTEREST AND REASSIGNMENT Assignors: IBJ SCHRODER BANK & TRUST COMPANY, AS AGENT
Expired - Lifetime legal-status Critical Current

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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
    • B66D1/02—Driving gear
    • B66D1/08—Driving gear incorporating fluid motors
    • 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
    • B66D2700/0125—Motor operated winches
    • B66D2700/0133—Fluid actuated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S60/00—Power plants
    • Y10S60/905—Winding and reeling

Definitions

  • ABSTRACT A free fall operating circuit for a hydraulic winch of the type including a hydraulically releasable free fall clutch includes a pump normally operable to release the clutch and a sensing valve operable to cut off the pump and allow the clutch to reset whenever there is relatively higher pressure in either main operating line for the winch motor, the net result being that there is free fall action whenever the main valve operating lever is in neutral.
  • the circuit includes a lockout valve, and this is interlocked with the machine start circuit to prevent starting while the clutch is released.
  • a safety valve and circuit prevent resetting of the clutch while the winch drum is in free fall motion.
  • winches have been designed which include a spring set, hydraulically released clutch operatively interposed between the drive mechanism and the winch drum, the idea being to release the clutch whenever a free fall is desired.
  • Prior actuating circuits for such winches have not, however, been entirely satisfactory, in part because they have been electrically operated whereas it is more desirable to have a full hydraulic operation.
  • FIG. 1 is a block diagram illustrating schematically the type of hydraulic winch with which the circuit of this invention is intended to be used, and
  • FIG. 2 is a schematic circuit diagram illustrating a preferred embodiment of the invention.
  • the winch illustrated schematically in FIG. 1 is of a type known to those skilled in the art; and for this reason and since the invention may be used with various specific types of winches, the components of the winch are not shown and will not be described in detail.
  • the winch includes a reversible hydraulic hoist motor 1 which is connected to a revolving cable drum 2 through a suitable drive 3.
  • an automatic brake 4 is provided; this is a spring set, hydraulically released brake which, as will become apparent, in normal operation prevents the drum 2 from rotating until the operator moves the main hoist control valve from neutral position.
  • the brake 4 operates through a one way, overrunning clutch 5 so that the brake effectively operates in only one direction to prevent lowering of the load.
  • the brake 4 and clutch 5 are shown as operating in connection with the drive 3, but it will be apparent that they may be interposed anywhere between the motor 1 and the free fall clutch to be described.
  • a foot brake 6 is provided and acts directly on the drum 2 to allow the operator to control its rotation, particularly in free fall.
  • a free fall clutch 7 is operatively interposed between the drive 3 and drum 2. This is also a spring set, hydraulically released clutch, and normally provides an operative connection between the drum 2 and drive 3. When it is released as will be described, however, the drum is free to rotate in a free fall action controlled by the foot brake 6.
  • the hydraulic circuitry is shown in FIG. 2.
  • the hoist motor 1 is powered by a suitable main fluid source 8 through a conventional, manually operated hoist control valve 9, which is a standard opencenter, four way directional control valve in the embodiment shown, but which can be a pressure compensated valve or any other suitable control valve.
  • a main relief valve 10 provides overall system relief.
  • Two main operating lines lead to the motor 1, the left line 11 being the line that is pressurized during lowering, and the right line 12 being the. line that is pressurized during raising.
  • the brake 4 is connected to the line 11 by a pilot line 4, which means that this line must be pressurized before the brake 4 will be released allowing the load to be lowered. Again, the brake 4 is not effective to prevent a raising action because of the overrunning clutch 5.
  • the line 12 includes a conventional counterbalance valve 13 which also prevents lowering, and is piloted open by means of a connection 13' to the line 11.
  • the circuitry as thus fardescribed is conventional and well known to those skilled
  • the free fall circuit includes a free fall pump 14, which may be a separate pump as shown or other suitable fluid source, a lockout means in the form of a valve 15 and a sensing means in the form of a valve 16.
  • An actuating line leads from the pump 14 to the clutch 7, only the actuating cylinder of which is shownin FIG. 2, and includes a first portion 17 which leads from the pump 14 through the lockout valve 15 to the sensing valve 16, and a second portion 18 which leads from the sensing valve 16 to the clutch cylinder 7.
  • the valve 15 is a manually operated, two position valve which is shiftable between off and on" positions, preferably with a detent action. As seen in FIG. 2, the valve 15 is in its of position in which the actuating line portion 17 is effectively closed, with the pump side being cut off and directed to areturn line 19 and-the clutch side being opened to exhaust through a return line 20. When the valve 15 is shifted to the left, it is in its on position in which the actuating line portion 17 is open through the valve 15 for delivery of fluid from the pump 14. A pressure relief valve '21 leads from the actuating line portion 17 to provide system relief for the free fall circuit.
  • the sensing valve 16 is a spring centered, three position, four way, hydraulically piloted directional control valve of standard design. It has two inlets 22 and outlet port means in the form of two outlets 23which are connected to a common return line 24. It is spring biased toward a normal, centered position as shown, and in this position the two inlet ports 22 are interconnected, which serves to connect the lines 17 and 18 and thus open the actuating line between the pump 14 and clutch cylinder 7. It may, however, be piloted either upwardly or downwardly to opposite bypass positions in both of which the inlets 22 are connected to respective outlets 23.
  • the pump 16 operates as a release means which is normally operable to release the clutch 7, and thus 7, and thus provide a free fall action. This is possible, however, only if the valve 16 is in its centered position.
  • the centered position of the valve '16 will be assumed whenever there is no pressure differential between the lines 11 and 12, which occurs whenever the main control valve 9 is in its neutral position. Whenever the control valve 9 is shifted, however, either the line 11 or the line 12 will have a higher pressure.
  • valve 16 This will cause the valve 16 to shift to one or the other of its bypass positions in which the pump 14 is cut off and the line 18 is opened to effectively as the result of which the release means is efiecrively-deactivated and the clutch cylinder 7 will automatically reset.
  • the pilot connections 4' and 13' off the line 11 insure sufficient pilot pressure for the line 25, and to insure that there will be sufficient pressure in the line 12 for the line 26 a low level pressure relief valve 27 is interposed between the motor 1 and the connection of the pilot line 26.
  • the pilot lines 13' and 14 and valve 27 serve in effect as signal pressure generating means interposed in the lines 11 and 12 between the point of connection of the respective pilot line and 26 and the motor 1, which means insure sufficient pilot pressure for the valve 16 under all conditions.
  • the signal pressure generating means serve another desirable purpose in that they insure that there will be sufficient pressure to shift the valve 16 before there is sufficient pressure to operate the motor 1. As a result, the clutch 7 will reset before the motor 1 moves, thus providing for smooth,jerk-free operation. While the arrangement shown is quite satisfactory, other signal pressure generating means known to those skilled in the art could be substituted.
  • the free fall circuit is fully functional as thus far described, certain safety features are provided in the preferred embodiment.
  • the valve 15 is interlocked with the overall start circuit for the machine.
  • the start circuit is shown schematically at 28, and includes the usual main switch and other elements.
  • the operating lever for the valve 15 physically carries a switch means in the form of a bridging contact 29 which is in the start circuit so that the start circuit is completed only when the valve 15 is in the off position shown in FIG. 2.
  • the preferred embodiment includes a safety means in the form of a valve 30 which is interposed in the pilot lines 25 and 26.
  • the valve 30 is biased toward a normal open position shown in FIG. 2 in which the lines 25 and 26 are fully open and the valve 16 is operable in the manner described above.
  • the valve 30 can, however, be shifted downwardly as seen in FIG.
  • the valve 30 is solenoid actuated, and its actuating coil is included in a series safety circuit which also includes a pressure sensing switch 31 connected to the actuating line portion 18 and a speed sensing switch 32 associated with the drum 2.
  • the pressure switch 31 is normally open, but is set to close whenever there is at least a minimum selected pressure in the line 18, which indicates release of the clutch 7.
  • the speed switch 32 is also normally open, but is arranged to close whenever the output shaft is rotating in either direction at or above a preselected minimum speed, which can be zero if desired.
  • a dashpot valve 33 is interposed in the line 18. This allows free flow into the cylinder 7 but the outward flow is adjustably metered to provide a cushioning effect.
  • a free fall actuating circuit for a hydraulic winch of the type including a reversible hydraulic motor, a pair of opposite main fluid lines connected to the motor, control valve means in the main fluid lines movable between a first position in which there is relatively higher pressure in one main fluid line and a second position in which there is relatively higher pressure in the other main fluid line and a neutral position in which the pressures in the main fluid lines are substantially equal, a rotatable drum driven by the motor, and a normally set, hydraulically releasable free fall clutch operatively associated with the drum,
  • the combination comprising: hydraulic release means operative to release the clutch only when the control valve means is in neutral position; and hydraulically operable sensing means interposed between the main fluid lines and release means and automatically operable to deactivate the which means to allow the clutch to operatively engage the drum in response to relatively higher pressure in either main fluid line caused by shifting of the control valve means to either first or second position.
  • the release means includes a free fall fluid source and an actuating line leading from the fluid source to the clutch, the fluid source being operable to deliver fluid through the actuating line to release the clutch whenever the actuating line is open; and the sensing means includes a sensing valve in the actuating line, said sensing valve being biased toward a normal, centered position in which the actuating line is open therethrough and being hdraulically pilotable to opposite bypass positions in both of which the fluid source sideof the actuating line is cut off and the clutch side is opened to exhaust; and there are a pair of hydraulic pilot lines, one connected between each main fluid line and a respective end of the sensing valve so that the sensing valve is shifted to one of its bypass positions when there is relatively higher pressure in either main fluid line.
  • the sensing valve is a normally centered, three position valve with two inlet ports and outlet port means; and the actuating line includes a first portion leading from the fluid source to one inlet and a second portion between the clutch and the other inlet; and in the centered position of the sensing valve the inlets are connected to one another; and in both bypass positions the inlets are connected to the outlet port means; and the outlet port means is connected to a return line.
  • the sensing valve is a normally centered, three position valve with two inlet ports and outlet port means; and the actuating line includes a first portion leading from the fluid source to one inlet and a second portion between the clutch and the other inlet; and in the centered position of the sensing valve the inlets are connected to one another; and in both bypass positions the inlets are connected to the outlet port means; andthe outlet port means is connected to a return line.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control And Safety Of Cranes (AREA)
  • Fluid-Pressure Circuits (AREA)
US00192097A 1971-10-26 1971-10-26 Free fall circuit for hydraulic winch Expired - Lifetime US3764111A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19209771A 1971-10-26 1971-10-26

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US3764111A true US3764111A (en) 1973-10-09

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US00192097A Expired - Lifetime US3764111A (en) 1971-10-26 1971-10-26 Free fall circuit for hydraulic winch

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US (1) US3764111A (enrdf_load_stackoverflow)
JP (1) JPS5218974B2 (enrdf_load_stackoverflow)
CA (1) CA956924A (enrdf_load_stackoverflow)
GB (1) GB1371839A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3871714A (en) * 1972-08-19 1975-03-18 Orenstein & Koppel Ag Fluid motor drive for lifting device such as a winch with accumulated pressure starting after brake release
US4398698A (en) * 1981-05-29 1983-08-16 Fmc Corporation Freefall winch system and method of operation
US4516755A (en) * 1982-06-02 1985-05-14 Kabushiki Kaisha Komatsu Seisakusho Hydraulic winch control system
US6371447B1 (en) * 1998-12-25 2002-04-16 Kobelco Construction Machinery Co., Ltd. Control method for hydraulic-driven winch and apparatus therefor
CN102336372A (zh) * 2010-07-16 2012-02-01 徐州重型机械有限公司 起重机及其卷扬装置的液压控制系统
CN103723645A (zh) * 2014-01-20 2014-04-16 安徽柳工起重机有限公司 强夯机快放卷扬控制系统
US20210039928A1 (en) * 2019-08-05 2021-02-11 Goodrich Corporation Auxiliary brake assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS574597B2 (enrdf_load_stackoverflow) * 1974-03-04 1982-01-26
JPS56165696A (en) * 1980-05-26 1981-12-19 Komatsu Mfg Co Ltd Brake gear for oil pressure type crane winch
US4549640A (en) * 1982-01-28 1985-10-29 Hitachi Construction Machinery Co., Ltd. Operation system for hoisting device
CN109132909B (zh) * 2018-10-10 2021-02-05 三一汽车起重机械有限公司 卷扬液压控制系统及起重机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2258307A (en) * 1938-11-18 1941-10-07 Vickers Inc Power transmission
US3249336A (en) * 1963-06-18 1966-05-03 Baldwin Lima Hamilton Corp Hydraulic winch control mechanism
US3550735A (en) * 1968-09-23 1970-12-29 Hyster Co Fluid pressure reversing clutches and brake for winch
US3578787A (en) * 1968-11-12 1971-05-18 Northwest Engineering Corp Control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2258307A (en) * 1938-11-18 1941-10-07 Vickers Inc Power transmission
US3249336A (en) * 1963-06-18 1966-05-03 Baldwin Lima Hamilton Corp Hydraulic winch control mechanism
US3550735A (en) * 1968-09-23 1970-12-29 Hyster Co Fluid pressure reversing clutches and brake for winch
US3578787A (en) * 1968-11-12 1971-05-18 Northwest Engineering Corp Control system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3871714A (en) * 1972-08-19 1975-03-18 Orenstein & Koppel Ag Fluid motor drive for lifting device such as a winch with accumulated pressure starting after brake release
US4398698A (en) * 1981-05-29 1983-08-16 Fmc Corporation Freefall winch system and method of operation
US4516755A (en) * 1982-06-02 1985-05-14 Kabushiki Kaisha Komatsu Seisakusho Hydraulic winch control system
US6371447B1 (en) * 1998-12-25 2002-04-16 Kobelco Construction Machinery Co., Ltd. Control method for hydraulic-driven winch and apparatus therefor
CN102336372A (zh) * 2010-07-16 2012-02-01 徐州重型机械有限公司 起重机及其卷扬装置的液压控制系统
CN103723645A (zh) * 2014-01-20 2014-04-16 安徽柳工起重机有限公司 强夯机快放卷扬控制系统
CN103723645B (zh) * 2014-01-20 2016-09-21 安徽柳工起重机有限公司 强夯机快放卷扬控制系统
US20210039928A1 (en) * 2019-08-05 2021-02-11 Goodrich Corporation Auxiliary brake assembly
US10947094B2 (en) * 2019-08-05 2021-03-16 Goodrich Corporation Auxiliary brake assembly

Also Published As

Publication number Publication date
CA956924A (en) 1974-10-29
JPS4862151A (enrdf_load_stackoverflow) 1973-08-30
JPS5218974B2 (enrdf_load_stackoverflow) 1977-05-25
GB1371839A (en) 1974-10-30

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AS Assignment

Owner name: NORTHWEST ENGINEERING COMPANY 201 WEST WALNUT STRE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BUCYRUS-ERIE COMPANY;REEL/FRAME:004433/0395

Effective date: 19850314

AS Assignment

Owner name: IBJ SCHRODER BANK & TRUST COMPANY, NEW YORK

Free format text: SECURITY INTEREST;ASSIGNOR:TEREX CORPORATION;REEL/FRAME:006080/0201

Effective date: 19920327

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Owner name: TEREX CORPORATION, CONNECTICUT

Free format text: RELEASE OF SECURITY INTEREST AND REASSIGNMENT;ASSIGNOR:IBJ SCHRODER BANK & TRUST COMPANY, AS AGENT;REEL/FRAME:007312/0374

Effective date: 19920731