US20120144998A1 - Hydraulic Activation for a Sliding Carriage - Google Patents

Hydraulic Activation for a Sliding Carriage Download PDF

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Publication number
US20120144998A1
US20120144998A1 US13/375,761 US201013375761A US2012144998A1 US 20120144998 A1 US20120144998 A1 US 20120144998A1 US 201013375761 A US201013375761 A US 201013375761A US 2012144998 A1 US2012144998 A1 US 2012144998A1
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US
United States
Prior art keywords
carriage
piston rod
jacks
hydraulic
jack
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.)
Abandoned
Application number
US13/375,761
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English (en)
Inventor
Giuseppe Burgo
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.)
CNH Industrial America LLC
Original Assignee
CNH Amercia LLC
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 CNH Amercia LLC filed Critical CNH Amercia LLC
Publication of US20120144998A1 publication Critical patent/US20120144998A1/en
Assigned to CNH AMERICA LLC reassignment CNH AMERICA LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CNH ITALIA S.P.A., BURGO, GIUSEPPE
Assigned to CNH INDUSTRIAL AMERICA LLC reassignment CNH INDUSTRIAL AMERICA LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: CNH AMERICA LLC
Abandoned legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F3/00Dredgers; Soil-shifting machines
    • E02F3/04Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36Component parts
    • E02F3/38Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
    • E02F3/382Connections to the frame; Supports for booms or arms
    • E02F3/386Connections to the frame; Supports for booms or arms the boom being laterally shiftable relative to the frame

Definitions

  • the present invention relates to hydraulic actuation of a sliding carriage guided for movement along a linear path.
  • a backhoe is an item of excavating equipment comprising a digging bucket on the end of a two-part articulated arm, the two parts being termed a main boom and a dipper.
  • Backhoes are typically mounted on the back of a vehicle, such as a tractor or front loader, and can be used for example to dig trenches.
  • the present invention is concerned with a hydraulic system which may serve the purpose of the fluid operated ram in EP 0 692 579 but may alternatively be used to move any carriage that is guided for movement along a linear path.
  • a first consideration is the size of the actuator, in that it must be capable of being accommodated within the path of travel of the carriage yet it must not limit the movement of the carriage. Another consideration is that the actuator needs itself to be supported in a suitable manner to ensure that its piston rod and cylinder axis always remain in alignment, even when under load. A further consideration is that it should be possible to offer protection to any extended piston rod as it risks being damaged in the dirty environment in which heavy equipment, such as a backhoe, operates.
  • FIGS. 1 and 2 of the accompanying drawings show different positions of a hydraulic system described in EP 1 264 938 which is believed to represent the closest prior art to the present invention and is incorporated herein by reference.
  • This system uses only rams to move the king post assembly of a backhoe from one end position to the other.
  • the system uses two hydraulic cylinders arranged “in series”. By this, it is meant that the total possible displacement of the carriage is equal to the sum of the strokes of the individual cylinders.
  • the illustrated arrangement is preferred to the other embodiment described in EP 1 264 938 which uses a cylinder with telescopically collapsible piston rods because it allows the cylinder body to be guided so as to maintain the pistons rods and cylinders in axial alignment when under load.
  • the sliding carriage is designated 10 and it is constituted by a king post assembly on which the boom arm of a backhoe is pivoted.
  • the carriage 10 is guided to slide along a stationary support frame 12 mounted transversely on the vehicle body, so that the carriage can move from an extreme left position, shown in FIG. 1 , to an extreme right position, shown in FIG. 2 .
  • the carriage 10 is moved by a two hydraulic jacks or rams 14 and 16 arranged in series with one another.
  • the cylinders 14 a and 16 a of the two jacks are secured to one another and to a slotted guide plate 18 that receives a pin 20 secured to the carriage 10 by a fixed bracket (not shown).
  • the end of the piston rod 14 b of the upper jack 14 is connected by a pivot 22 to the support frame 22 while the free end of the rod 16 b of the jack 16 is connected by a pin pivot 24 to a bracket 26 projecting from the right hand side of the carriage 10 .
  • the present invention provides an improved hydraulic system that avoids several shortcomings of the system illustrated in FIGS. 1 and 2 , which will now be explained.
  • the separation between the pivot pins 22 and 24 in the position of FIG. 2 is equal to the full width of the guide frame 12 . Consequently, when pressure is applied to move the carriage to this position, the force tending to bend the piston rods out of aligment with the cylinders is a maximum. Furthermore, the pin 20 in this right hand position of the carriage 10 is at the very end of the cylinder of the upper jack 14 so that the pin 20 has little effect to prevent the piston rod 14 b from being bent out of alignment with its cylinder 14 a.
  • the jacks 14 and 16 are not equally effective in both directions because each of their pistons has a large surface area on one side and a smaller surface area on the side connected to the piston rod.
  • the piston surfaces used to return the carriage to the position shown in FIG. 1 are the smaller annular surfaces.
  • the present invention provides a hydraulic system for moving a carriage guided for movement along a linear path by a support frame, the system comprising two hydraulic jacks, each having a cylinder body and a piston rod, wherein the cylinder bodies of the two jacks are joined to one another, the end of the piston rod of one jack is connected to the support frame and the end of the piston rod of the other jack is connected to the carriage, characterised in that the two piston rods project from the same side of the joined cylinder bodies and in each end position of the carriage, the piston rod of a respective one of the jacks is fully extended while that of the other jack is fully retracted.
  • the two jacks have strokes of unequal length and the second piston rod is connected to the side of the carriage that is nearer to the side of the frame connected to the first piston rod.
  • the joined cylinders are formed with a projecting pin engaged in a slot in a guide movable with the carriage in order to prevent misalignment between the axes of the piston rods and the cylinders when under load.
  • FIGS. 1 and 2 show a hydraulic system as taught by EP 0 692 579, and
  • FIGS. 3 , 4 and 5 show a hydraulic system of the present invention in different positions of the carriage.
  • FIGS. 3 to 5 components serving the same function as already described with reference to FIGS. 1 and 2 have been allocated similar reference numerals in the 100's series and will not be described a second time.
  • the hydraulic circuit of FIGS. 3 to 5 used two jacks 114 , 116 of unequal stroke length and with their respective piston rods 114 b and 116 b projecting in the same direction from the cylinders 114 a and 116 a .
  • the end of the piston rod 114 b of the longer jack 116 is connected to the frame 112 by a pivot pin 122 while the end of the piston rod 116 b of the shorter jack 116 is connected by a pivot pin 124 to a bracket 126 secured to the carriage 110 .
  • the pin 124 is located on the left side of the carriage 110 , that is to say the side nearer the side of the frame 112 connected to the piston rod 114 b.
  • a guide plate 118 secured to the carriage 110 has a slot which receives a pin 120 fixed to joined cylinders 114 a and 116 a near to the end of the cylinder 116 a from which the piston rod 116 b projects. It would be possible to secure the slotted guide plate 118 to the cylinders 114 a , 116 a and the pin to the carriage 110 as was the case in the hydraulic circuit of FIGS. 1 and 2 .
  • the carriage 110 lies in its left hand position in the frame 112 with the piston rod 114 b fully retracted and the piston rod 116 b fully extended.
  • hydraulic fluid is applied to the larger face of the piston of the hydraulic jack.
  • the force can be supplemented by applying fluid under pressure to the annular smaller face of the piston of the jack 116 .
  • the combined force is sufficient to initiate movement of the carriage 110 to the right and this can continue until the piston rod 114 b is fully extended as shown in FIG. 4 .
  • Continued application of fluid under pressure to the smaller face of the piston of the jack 116 can apply sufficient force to overcome dynamic friction and keep the carriage moving until it reaches the right hand end position shown in FIG. 5 . In this second end position, the piston rod 114 b is fully extended but the piston rod 116 b is fully retracted.
  • bracket 126 does not project beyond the side of the frame, it does not interfere with the carriage reaching either of its end position.
  • the maximum separation between the ends of the piston rods is less than the full width of the support frame by the width of the carriage 110 .
  • the tendency for the cylinders 114 a , 116 a to move up and down in the plane of the figures or to move in direction normal to the plane of the figures is reduced.
  • the cylinders 114 a , 116 a are supported in the same central position, corresponding to the position of the pin 120 .
  • the hydraulic system can be mounted above the carriage where it is less exposed to dirt. Furthermore, it is readily possible to mount a fixed shield on the frame 22 to protect the piston rod 114 b when it is extended. Another shield may be fixed to the underside of the part of the hydraulic cylinder 114 a that projects beyond the cylinder 116 a to protect the piston rod 116 b when it is extended.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Actuator (AREA)
  • Forklifts And Lifting Vehicles (AREA)
US13/375,761 2009-06-03 2010-06-02 Hydraulic Activation for a Sliding Carriage Abandoned US20120144998A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT000421A ITTO20090421A1 (it) 2009-06-03 2009-06-03 Attuatore idraulico per un carrello scorrevole
ITTO2009A000421 2009-06-03
PCT/EP2010/057748 WO2010139748A1 (en) 2009-06-03 2010-06-02 Hydraulic actuation for a sliding carriage

Publications (1)

Publication Number Publication Date
US20120144998A1 true US20120144998A1 (en) 2012-06-14

Family

ID=41461023

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/375,761 Abandoned US20120144998A1 (en) 2009-06-03 2010-06-02 Hydraulic Activation for a Sliding Carriage

Country Status (5)

Country Link
US (1) US20120144998A1 (it)
EP (1) EP2438241B1 (it)
IT (1) ITTO20090421A1 (it)
RU (1) RU2559242C2 (it)
WO (1) WO2010139748A1 (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016141255A1 (en) * 2015-03-04 2016-09-09 ENGELBRECHT, Frederick W. Anton Vehicle trailer system
US20180245299A1 (en) * 2017-02-28 2018-08-30 Todd E. Kautzman Snow and debris removal apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564209A (en) * 1983-09-22 1986-01-14 Kingsley Bertis N Trailer hitch assembly
US5606809A (en) * 1994-07-16 1997-03-04 J. C. Bamford Excavators Limited Mechanical excavators
GB2370319A (en) * 2000-11-18 2002-06-26 Passenger Lift Services Ltd Single-feed tandem cylinder
US20020168255A1 (en) * 2000-04-26 2002-11-14 Kish John A. Vehicle restraint with vertical float
US6688211B1 (en) * 2002-02-20 2004-02-10 Vu H. Viet Dual linear actuator

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1950866U (de) * 1966-06-20 1966-12-01 Erich Kopschitz Kugelfoermiger dekorationskoerper.
DE1950866A1 (de) * 1969-10-09 1971-04-29 Eickhoff Geb Vorrichtung zur Hubverstellung von vorzugsweise pneumatischen Zylindern,insbesondere fuer Verpackungsmaschinen od.dgl.
US3653131A (en) * 1970-03-24 1972-04-04 Ware Machine Works Inc Excavating apparatus
SU457777A1 (ru) * 1972-11-28 1975-01-25 Предприятие П/Я В-2085 Рабочий орган машины дл отрывки траншей
SU922054A1 (ru) * 1980-09-26 1982-04-23 Северный Филиал Всесоюзного Научно-Исследовательского Института По Строительству Магистральных Трубопроводов Длинноходовой гидравлический механизм
RU2049869C1 (ru) * 1990-08-20 1995-12-10 Шаволов Андрей Сергеевич Рабочее оборудование траншеекопателя
EP0805067B1 (en) * 1996-04-05 2001-07-25 Nv Nuyts Orb Loading lift for the container of a truck
ITBO20010365A1 (it) * 2001-06-08 2002-12-08 New Holland Italia Spa Macchina movimento terra e dispositivo attuatore per lo spostamento laterale di una relativa pala caricatrice

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564209A (en) * 1983-09-22 1986-01-14 Kingsley Bertis N Trailer hitch assembly
US5606809A (en) * 1994-07-16 1997-03-04 J. C. Bamford Excavators Limited Mechanical excavators
US20020168255A1 (en) * 2000-04-26 2002-11-14 Kish John A. Vehicle restraint with vertical float
GB2370319A (en) * 2000-11-18 2002-06-26 Passenger Lift Services Ltd Single-feed tandem cylinder
US6688211B1 (en) * 2002-02-20 2004-02-10 Vu H. Viet Dual linear actuator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016141255A1 (en) * 2015-03-04 2016-09-09 ENGELBRECHT, Frederick W. Anton Vehicle trailer system
CN107531175A (zh) * 2015-03-04 2018-01-02 理查德·艾伦·斯塔尔 车辆拖车系统
US9862297B2 (en) 2015-03-04 2018-01-09 Selectrailers, L.L.C Vehicle trailer system
US20180245299A1 (en) * 2017-02-28 2018-08-30 Todd E. Kautzman Snow and debris removal apparatus
US10870960B2 (en) * 2017-02-28 2020-12-22 Todd E. Kautzman Snow and debris removal apparatus

Also Published As

Publication number Publication date
WO2010139748A1 (en) 2010-12-09
ITTO20090421A1 (it) 2010-12-04
RU2011153695A (ru) 2013-07-20
EP2438241A1 (en) 2012-04-11
RU2559242C2 (ru) 2015-08-10
EP2438241B1 (en) 2013-03-13

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AS Assignment

Owner name: CNH AMERICA LLC, PENNSYLVANIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BURGO, GIUSEPPE;CNH ITALIA S.P.A.;SIGNING DATES FROM 20120213 TO 20120227;REEL/FRAME:033303/0563

AS Assignment

Owner name: CNH INDUSTRIAL AMERICA LLC, PENNSYLVANIA

Free format text: CHANGE OF NAME;ASSIGNOR:CNH AMERICA LLC;REEL/FRAME:033361/0551

Effective date: 20140301

STCB Information on status: application discontinuation

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