US3703298A - Device for automatic self-levelling of the body of a threshing-harvesting machine - Google Patents

Device for automatic self-levelling of the body of a threshing-harvesting machine Download PDF

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Publication number
US3703298A
US3703298A US152144A US3703298DA US3703298A US 3703298 A US3703298 A US 3703298A US 152144 A US152144 A US 152144A US 3703298D A US3703298D A US 3703298DA US 3703298 A US3703298 A US 3703298A
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United States
Prior art keywords
electro
switches
levelling
valve
pump
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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
US152144A
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English (en)
Inventor
Pietro Laverda
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Pietro Laverda SpA
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Pietro Laverda SpA
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Publication of US3703298A publication Critical patent/US3703298A/en
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D75/00—Accessories for harvesters or mowers
    • A01D75/28—Control mechanisms for harvesters or mowers when moving on slopes; Devices preventing lateral pull
    • A01D75/285—Control mechanisms for harvesters or mowers when moving on slopes; Devices preventing lateral pull with arrangements for holding the harvesting or mowing apparatus in a horizontal position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2200/00—Indexing codes relating to suspension types
    • B60G2200/30—Rigid axle suspensions
    • B60G2200/32—Rigid axle suspensions pivoted
    • B60G2200/322—Rigid axle suspensions pivoted with a single pivot point and a straight axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/08—Agricultural vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/90—System Controller type
    • B60G2800/91—Suspension Control
    • B60G2800/912—Attitude Control; levelling control

Definitions

  • This invention relates to a device for effecting automatic levelling threshing-harvesting machines.
  • the body of such machines is hinged in its center for rocking movement about axles which are formed by double levers interconnected in deformable parallelogram linkages, the body being kept upright by hydraulic double-acting rams.
  • the cutting platform of the machine is kept substantially parallel to the ground by means of other devices which form a connection between the platform itself and the front axle of the machine.
  • An object of this invention is to provide a device for the automatic levelling of the body of such machines, which is of simple, strong and economical construction, precise and safe in operation and of high functional efficiency.
  • Another object of this invention is to provide a device of the above mentioned type, which allows automatic levelling at different rates as a function of the inclination taken of the body to the horizontal and which allows at the same time manual emergency operation for quick straightening.
  • a further object of this invention is to provide a device as aforesaid which has high sensitivity and precision of control and is able to cease operation immediately in the event of an excessive inclination of the body to the horizontal, initiating an alarm signal.
  • the present invention accordingly provides a device for effecting automatic levelling of the body of a threshing-harvesting machine, characterized in that the device comprises two inter-communicating liquid-containing vessels, mounted on opposite lateral sides of the body, first and second magnetic level-sensitive switches placed at different lateral positions or heights in each vessel and adapted to operate selectively in response to lateral inclinations of the body of the machine to the horizontal by more than a first and more than a second angle respectively, the second angle being greater than the first, the first switches being arranged to operate a double acting first electro-valve in a feed circuit for two hydraulic levelling actuators and the second switches being arranged to operate a second electro-valve,
  • FIG. 1 is a schematic front view of a threshing-harvesting machine provided with an automatic body levelling device according to one embodiment of the invention
  • FIG. 2 is an hydraulic circuit diagram of the device
  • FIG. 3 is an electric circuit diagram of the device.
  • reference numeral 1 indicates the body of a threshing-harvesting machine (drawn without its cutting platform).
  • the body 1 has a central front appendage la which is pivotally connected to a front axle 3 by means of a center pivot 2 for rocking movement about a central longitudinal axis.
  • the body 1 is formed with two lateral brackets 4, 4 which provide pivotal support for the cylinders 5, 5 of the respective hydraulic double-acting rams, the piston rods 6, 6' of which are pivotally connected by means of respective joints 7, 7' to opposite ends of the axle 3.
  • the ram cylinders 5, 5' are supplied from an hydraulic pump 8, which draws hydraulic fluid from a tank 9 and supplies the fluid under pressure, through an adjustable spring-loaded pressure relief valve 10, to a conduit 11 which subdivides into two branch conduits 12 and 13.
  • the branch conduit 12 supplies the fluid under pressure to a double-acting first solenoid-operated electrovalve 14.
  • the valve 14 has a first pair of output conduits 15, 15' connected to opposite ends of the respective cylinders 5, 5' and a second pair of output conduits 16, 16 connected to the other ends of said cylinders, so that the conduits 15 and 16' are connected to the lower ends of the cylinders 5 and 5 and the conduits 15' and 16 are connected to the upper ends of the cylinders 5' and 5 respectively.
  • the branch conduit 13 is connected through an adjustable flow restrictor 17 to a single-acting second solenoid-operated electro-valve' 19 which, in its rest condition, connects the output of the restrictor 17 to the tank 9 to ensure that substantially half the output flow from the pump 8 reaches the first electro-valve 14.
  • FIG. 3 illustrates the electric circuit of the device.
  • Two inter-communicating vessels 19, 19' are fixed laterally to the body 1 of the machine and communicate through aconduit 19a containing a throttling valve 19b.
  • Each vessel 19 and 19 contains two magnetically operated float switches 20, 21 and 20', 21' respectively co-operating with respective magnetic relays 22, 23 and 22', 23.
  • the two switches 20, 21 and 20, 21' in each vessel 19 and 19 are spaced apart laterally so that the two outermost switches 20 and 20 are more sensitive to lateral inclination of the body 1 than the two innermost switches 21 and 21'.
  • the two switches 20, 21 and 20', 21 may be arranged at different heights in each vessel.
  • a micro-switch 31 is operable manually by means of an emergency lever 32, pivoted at 33 and adapted to act mechanically on the double-acting first electrovalve 14.
  • Two limit micro-switches 34, 34' are arranged to be operated directly by the axle 3 when the lateral inclination of the body 1 exceeds the maximum inclination at which the automatic control device is allowed to operate.
  • the fluid transfer rate from one vessel to the other is controlled by the throttling valve 21 so that the damping action of the liquid allows the body of the machine to reach an exactly upright position and not a position inclined to the horizontal.
  • the axle 3 When the inclination of the machine body to the horizontal has reached the maximum limit of safety, the axle 3 operates one of the limit switches 34 and 34, so that the relay 27 is energized, causing operation of the interruptor 28 and therefore of the optical and acoustic alarm device 30 and the flasher lamp 29. As the same time the current is cut off from the relays 22, 23, 22', 23 of the float switches and so the two electro-valves 14 and 18 remain in their rest positions and the hydraulic circuit is inoperative. Automatic levelling control therefore ceases.
  • the first electro-valve 14 can also be controlled manually by means of the emergency lever 32, which acts mechanically on the moving part of the valve 14 and which also operates the micro-switch 31 so as to interrupt the current which would normally be supplied to the relays 22, and 22 by the inner float switches 20 and 20' supplying this current directly to the electrovalve 18, which causes the entire output flow from the pump 8 to reach the first electrovalve 14, allowing rapid levelling of the body 1 of the machine, as previously described, as if one of the inner float switches 23,
  • Device for effecting automatic levelling of the body of a threshing-harvesting machine comprising in combination:
  • conduit means intercommunicating said vessels
  • first and second magnetic level-sensitive switches in each respective vessel, said two switches being located at different lateral positions in each vessel and being operable selectively in response to lateral inclinations of said body of the machine to the horizontal by more than a first and a second angle respectively, the second angle being greater than the first;
  • an hydraulic circuit including two hydraulic levelling actuators, said first electro-valve being included in said circuit and controlling supply of hydraulic fluid thereto;
  • a second electro-valve operable by the second switches, said second electro-valve normally reducing the flow of hydraulic fluid under pressure from said pump to the actuators, the latter being supplied with the full pump flow to effect rapid levelling when 7 said second electro-valve is operated by said second switches,
  • said manual control means for operating the two electro-valves comprise a lever arranged to act mechanically on the movable part of the first electro-valve and including an electric switch operable simultaneously by said lever to operate said second electro-valve so that the entire output flow of said pump is supplied to said levelling actuators for rapid levelling.
  • said means to prevent said two electro-valves from operating and for activating said alarm device are formed by two limit switches arranged to be operated mechanically by an axle of the machine when the body of the machine exceeds a maximum predetermined inclination to the horizontal, a relay connected to said limit switches, an interruptor connected to said relay and operable upon energization thereof, and an optical and acoustic alarm device connected to the interruptor for operation thereby in response to operation of either limit switch, said limit switches upon operation also breaking the electric circuits of said two electro-valves.

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Level Indicators Using A Float (AREA)
  • Threshing Machine Elements (AREA)
US152144A 1970-07-06 1971-06-11 Device for automatic self-levelling of the body of a threshing-harvesting machine Expired - Lifetime US3703298A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT6932370 1970-07-06

Publications (1)

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US3703298A true US3703298A (en) 1972-11-21

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US152144A Expired - Lifetime US3703298A (en) 1970-07-06 1971-06-11 Device for automatic self-levelling of the body of a threshing-harvesting machine

Country Status (3)

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US (1) US3703298A (enrdf_load_stackoverflow)
ES (1) ES392387A1 (enrdf_load_stackoverflow)
FR (1) FR2098106A5 (enrdf_load_stackoverflow)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861696A (en) * 1972-06-01 1975-01-21 Bofors Ab Device for damping rocking movements occurring in a chassis
US3881743A (en) * 1974-05-02 1975-05-06 Gen Motors Corp Automotive leveling system
US4050704A (en) * 1975-09-08 1977-09-27 Institutul De Cercetari Si Proiectari De Masini Agricole-Icpma Device for maintaining an upright position of the body of a harvester-thresher machines
US4315631A (en) * 1979-03-08 1982-02-16 Edmond Rainville Trailers for elongated loads
US4679489A (en) * 1985-11-04 1987-07-14 Becor Western Inc. Automatic leveling system for blast hole drills and the like
US4679803A (en) * 1986-01-27 1987-07-14 The United States Of America As Represented By The Secretary Of Agriculture Apparatus for maintaining stability of mobile land vehicles on sloping terrain
US4750751A (en) * 1986-11-26 1988-06-14 Deere & Company Pivoting axle for a hillside combine
US5178402A (en) * 1991-08-07 1993-01-12 Deere & Company Leveling assembly for a vehicle
DE4131433A1 (de) * 1991-09-21 1993-04-01 Deere & Co Schwenkvorrichtung fuer ein getriebegehaeuse
DE4209340A1 (de) * 1992-03-23 1993-09-30 Deere & Co Landmaschine und Tragachse
EP0698338A1 (de) 1991-09-21 1996-02-28 Deere & Company Erntemaschine mit Seitenhangausgleich
US5997013A (en) * 1997-07-23 1999-12-07 Upright, Inc. Chassis stabilization system
EP0994009A1 (en) * 1998-10-16 2000-04-19 Same Deutz-Fahr S.P.A. An agricultural machine with a self-leveling cab
US6279931B1 (en) * 1995-08-30 2001-08-28 John F. Kopczynski Vehicle with vertically movable and vertically pulsating wheels
US6331010B1 (en) * 1997-07-23 2001-12-18 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Structure for supporting cylinders
US6382637B1 (en) * 2000-08-12 2002-05-07 Firma Carl Freudenberg Device for controlling the flow rate of hydraulic fluid in a supply line for vehicles
US6467776B1 (en) * 1999-08-18 2002-10-22 Bobcat France S.A. Device for tilt correction of a two axles platform
EP1522215A1 (en) * 2003-10-08 2005-04-13 Angel Carlos Irujo Lopez Levelling-compensating system for harvesters and the like
USRE39477E1 (en) * 1992-12-04 2007-01-23 Jlg Omniquip, Inc. Forklift stabilizing apparatus
US20070262549A1 (en) * 2006-05-12 2007-11-15 Haerr Timothy A Vehicle hydraulic system
US20090115148A1 (en) * 2007-11-07 2009-05-07 In Woo Kim Leveling apparatus for excavator and forestry machine equipment
US20090118913A1 (en) * 2006-05-26 2009-05-07 O'halloran James Vector Controlled Leveling System for a Forestry Machine
US20100204886A1 (en) * 2009-02-12 2010-08-12 Lockheed Martin Corporation Method and system for increasing a vehicle side slope operating capabilities
US20110018219A1 (en) * 2009-07-27 2011-01-27 International Truck Intellectual Property Company, Llc Hydraulic, rigid rear axle suspension system for vehicles
US20150151952A1 (en) * 2012-05-31 2015-06-04 Ponsse Oyj Stabilizing of forest work unit
EP3348132A1 (en) * 2017-01-12 2018-07-18 CNH Industrial Belgium NV Lateral tilt control system for an agricultural harvester
CN112781560A (zh) * 2021-01-26 2021-05-11 太原理工大学 一种自动手动联合调平装置及方法
US11259463B1 (en) * 2018-10-04 2022-03-01 Harper Industries, Inc. Slope mower with automatic leveling suspension and system for maintaining vertical orientation of mower body
US11470773B2 (en) 2017-08-02 2022-10-18 Briggs & Stratton, Llc Stand-on mower with an oscillating front axle
US20220402323A1 (en) * 2021-06-22 2022-12-22 Blackseries Intelligent Equipment (Weihai) Co., Ltd Self-balancing device for self-propelled off-road rv box body

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181878A (en) * 1959-12-15 1965-05-04 Dawson Vogel Engineering Compa Electromagnetic control system for fluid actuated suspension system
US3233909A (en) * 1964-04-24 1966-02-08 Allis Chalmers Mfg Co Leveling system for hillside combines
US3264008A (en) * 1962-12-05 1966-08-02 Allinquant Fernand Stanislas Vehicles having electrically controlled automatic level-correcting suspension

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181878A (en) * 1959-12-15 1965-05-04 Dawson Vogel Engineering Compa Electromagnetic control system for fluid actuated suspension system
US3264008A (en) * 1962-12-05 1966-08-02 Allinquant Fernand Stanislas Vehicles having electrically controlled automatic level-correcting suspension
US3233909A (en) * 1964-04-24 1966-02-08 Allis Chalmers Mfg Co Leveling system for hillside combines

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861696A (en) * 1972-06-01 1975-01-21 Bofors Ab Device for damping rocking movements occurring in a chassis
US3881743A (en) * 1974-05-02 1975-05-06 Gen Motors Corp Automotive leveling system
US4050704A (en) * 1975-09-08 1977-09-27 Institutul De Cercetari Si Proiectari De Masini Agricole-Icpma Device for maintaining an upright position of the body of a harvester-thresher machines
US4315631A (en) * 1979-03-08 1982-02-16 Edmond Rainville Trailers for elongated loads
US4679489A (en) * 1985-11-04 1987-07-14 Becor Western Inc. Automatic leveling system for blast hole drills and the like
US4679803A (en) * 1986-01-27 1987-07-14 The United States Of America As Represented By The Secretary Of Agriculture Apparatus for maintaining stability of mobile land vehicles on sloping terrain
US4750751A (en) * 1986-11-26 1988-06-14 Deere & Company Pivoting axle for a hillside combine
EP0531688A3 (enrdf_load_stackoverflow) * 1991-08-07 1994-02-16 Deere & Co
US5178402A (en) * 1991-08-07 1993-01-12 Deere & Company Leveling assembly for a vehicle
DE4131433A1 (de) * 1991-09-21 1993-04-01 Deere & Co Schwenkvorrichtung fuer ein getriebegehaeuse
EP0698338A1 (de) 1991-09-21 1996-02-28 Deere & Company Erntemaschine mit Seitenhangausgleich
DE4209340A1 (de) * 1992-03-23 1993-09-30 Deere & Co Landmaschine und Tragachse
USRE39477E1 (en) * 1992-12-04 2007-01-23 Jlg Omniquip, Inc. Forklift stabilizing apparatus
US6279931B1 (en) * 1995-08-30 2001-08-28 John F. Kopczynski Vehicle with vertically movable and vertically pulsating wheels
US5997013A (en) * 1997-07-23 1999-12-07 Upright, Inc. Chassis stabilization system
US6331010B1 (en) * 1997-07-23 2001-12-18 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Structure for supporting cylinders
EP0994009A1 (en) * 1998-10-16 2000-04-19 Same Deutz-Fahr S.P.A. An agricultural machine with a self-leveling cab
US6273203B1 (en) 1998-10-16 2001-08-14 Same Deutz-Fahr Spa Agricultural machine with a self-leveling cab
US6467776B1 (en) * 1999-08-18 2002-10-22 Bobcat France S.A. Device for tilt correction of a two axles platform
US6382637B1 (en) * 2000-08-12 2002-05-07 Firma Carl Freudenberg Device for controlling the flow rate of hydraulic fluid in a supply line for vehicles
ES2257130A1 (es) * 2003-10-08 2006-07-16 Angel Carlos Irujo Lopez Sistema nivelador-compensador para maquinas cosechadoras y similares.
EP1522215A1 (en) * 2003-10-08 2005-04-13 Angel Carlos Irujo Lopez Levelling-compensating system for harvesters and the like
ES2257130B1 (es) * 2003-10-08 2007-07-16 Angel Carlos Irujo Lopez Sistema nivelador-compensador para maquinas cosechadoras y similares.
US20070262549A1 (en) * 2006-05-12 2007-11-15 Haerr Timothy A Vehicle hydraulic system
US7665742B2 (en) * 2006-05-12 2010-02-23 Haerr Timothy A Vehicle hydraulic system
US20090118913A1 (en) * 2006-05-26 2009-05-07 O'halloran James Vector Controlled Leveling System for a Forestry Machine
US8180532B2 (en) * 2006-05-26 2012-05-15 Deere & Company Vector controlled leveling system for a forestry machine
US20090115148A1 (en) * 2007-11-07 2009-05-07 In Woo Kim Leveling apparatus for excavator and forestry machine equipment
US7832740B2 (en) * 2007-11-07 2010-11-16 Volvo Construction Equipment Holding Sweden Ab Leveling apparatus for excavator and forestry machine equipment
US20100204886A1 (en) * 2009-02-12 2010-08-12 Lockheed Martin Corporation Method and system for increasing a vehicle side slope operating capabilities
US20110018219A1 (en) * 2009-07-27 2011-01-27 International Truck Intellectual Property Company, Llc Hydraulic, rigid rear axle suspension system for vehicles
US20150151952A1 (en) * 2012-05-31 2015-06-04 Ponsse Oyj Stabilizing of forest work unit
US9550656B2 (en) * 2012-05-31 2017-01-24 Ponsse Oyj Stabilizing of forest work unit
EP3348132A1 (en) * 2017-01-12 2018-07-18 CNH Industrial Belgium NV Lateral tilt control system for an agricultural harvester
US10159182B2 (en) 2017-01-12 2018-12-25 Cnh Industrial America Llc Lateral tilt control system for an agricultural harvester
US11019769B2 (en) 2017-01-12 2021-06-01 Cnh Industrial America Llc Lateral tilt control for an agricultural harvester
US11470773B2 (en) 2017-08-02 2022-10-18 Briggs & Stratton, Llc Stand-on mower with an oscillating front axle
US11259463B1 (en) * 2018-10-04 2022-03-01 Harper Industries, Inc. Slope mower with automatic leveling suspension and system for maintaining vertical orientation of mower body
CN112781560A (zh) * 2021-01-26 2021-05-11 太原理工大学 一种自动手动联合调平装置及方法
CN112781560B (zh) * 2021-01-26 2022-09-16 太原理工大学 一种自动手动联合调平装置及方法
US20220402323A1 (en) * 2021-06-22 2022-12-22 Blackseries Intelligent Equipment (Weihai) Co., Ltd Self-balancing device for self-propelled off-road rv box body
US11718140B2 (en) * 2021-06-22 2023-08-08 Blackseries Intelligent Equipment (Weihai) Co., Ltd Self-balancing device for self-propelled off-road RV box body

Also Published As

Publication number Publication date
ES392387A1 (es) 1973-08-01
FR2098106A5 (enrdf_load_stackoverflow) 1972-03-03

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