EP2438241B1 - Kingpost assembly with hydraulically driven sideshift sliding carriage - Google Patents

Kingpost assembly with hydraulically driven sideshift sliding carriage Download PDF

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Publication number
EP2438241B1
EP2438241B1 EP10723105A EP10723105A EP2438241B1 EP 2438241 B1 EP2438241 B1 EP 2438241B1 EP 10723105 A EP10723105 A EP 10723105A EP 10723105 A EP10723105 A EP 10723105A EP 2438241 B1 EP2438241 B1 EP 2438241B1
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EP
European Patent Office
Prior art keywords
carriage
piston rod
kingpost
assembly
jacks
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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.)
Active
Application number
EP10723105A
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German (de)
French (fr)
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EP2438241A1 (en
Inventor
Giuseppe Burgo
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CNH Industrial Italia SpA
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CNH Industrial Italia SpA
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Publication date
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Publication of EP2438241A1 publication Critical patent/EP2438241A1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; 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
    • E02F3/36—Component parts
    • E02F3/38—Cantilever 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
    • E02F3/382—Connections to the frame; Supports for booms or arms
    • E02F3/386—Connections to the frame; Supports for booms or arms the boom being laterally shiftable relative to the frame

Definitions

  • the present invention relates to a king post assembly with a hydraulically actuated 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 Figure 1 , to an extreme right position, shown in Figure 2 .
  • the carriage 10 is moved by a two hydraulic jacks or rams 14 and 16 arranged in series with one another.
  • the cylinders 14a and 16a 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 14b of the upper jack 14 is connected by a pivot 22 to the support frame 22 while the free end of the rod 16b 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 Figures 1 and 2 , which will now be explained.
  • the separation between the pivot pins 22 and 24 in the position of Figure 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 14b from being bent out of alignment with its cylinder 14a.
  • 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 Figure 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.
  • the hydraulic circuit of Figures 3 to 5 used two jacks 114, 116 of unequal stroke length and with their respective piston rods 114b and 116b projecting in the same direction from the cylinders 114a and 116a.
  • the end of the piston rod 114b of the longer jack 116 is connected to the frame 112 by a pivot pin 122 while the end of the piston rod 116b 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 114b.
  • a guide plate 118 secured to the carriage 110 has a slot which receives a pin 120 fixed to joined cylinders 114a and 116a near to the end of the cylinder 116a from which the piston rod 116b projects. It would be possible to secure the slotted guide plate 118 to the cylinders 114a, 116a and the pin to the carriage 110 as was the case in the hydraulic circuit of Figures 1 and 2 .
  • 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 114b is fully extended as shown in Figure 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 Figure 5 . In this second end position, the piston rod 114b is fully extended but the piston rod 116b 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 114a, 116a 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 114a, 116a 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 114b when it is extended. Another shield may be fixed to the underside of the part of the hydraulic cylinder 114a that projects beyond the cylinder 116a to protect the piston rod 116b when it is extended.

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  • 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)

Description

    Field of the invention
  • The present invention relates to a king post assembly with a hydraulically actuated sliding carriage guided for movement along a linear path.
    • Background of the invention
  • 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.
  • It is known from EP 0 692 579 to connect the lower end of the boom arm of the backhoe pivotally to a king post assembly which allows pivotal slewing movement of the main boom about a vertical axis, so that the main boom can be rotated from one side to the other of the centre line of the vehicle. The king post assembly is itself mounted upon a guide and is movable along the guide in a direction transverse to the vehicle centreline. A fluid operated ram is connected between the king post assembly and an anchor point on the vehicle, so that extension or contraction of the ram causes movement of the king post assembly along the guide.
  • 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.
  • There are several criteria that need to be taken into consideration in the design of such a hydraulic actuator. 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.
  • Two solutions proposed in EP 0 692 579 involve repositioning the cylinder of the ram, either relative to the track or relative to the carriage. In this way, the maximum displacement of the carriage is not determined by the stroke of the ram. However, when operating in a dirty environment, neither of the embodiments described in the latter patent specification offers a solution satisfying the above criteria.
  • Figures 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.
  • In Figures 1 and 2, 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 Figure 1, to an extreme right position, shown in Figure 2. The carriage 10 is moved by a two hydraulic jacks or rams 14 and 16 arranged in series with one another. The cylinders 14a and 16a 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 14b of the upper jack 14 is connected by a pivot 22 to the support frame 22 while the free end of the rod 16b 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 Figures 1 and 2, which will now be explained.
  • First, it will be noted from Figure 2 that in its right hand side position, the carriage 10 stops short of the end right hand end of the frame 12 on account of the protruding bracket 26. Shortening the bracket 26 does not solve the problem because the length of the two jacks 14 and 16 would then need to be reduced to allow the carriage to reach the left hand end position and that would reduce the strokes of the two jacks.
  • Second, the separation between the pivot pins 22 and 24 in the position of Figure 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 14b from being bent out of alignment with its cylinder 14a.
  • A still further problem arises when pressure is applied to move the carriage 10 away from its right hand end position shown in Figure 2. 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 Figure 1 are the smaller annular surfaces. When moving the carriage to the left, as viewed, the jacks can apply enough force to overcome the dynamic friction on the carriage 10, but at times they cannot overcome the static friction. In other words, the jacks can keep the carriage moving to the left but on occasions they cannot initiate the movement when the carriage is in the position shown in Figure 2.
    • Summary of the invention
  • With a view to overcoming at least some of the above shortcomings, 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.
  • In the preferred embodiment of the invention, 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.
  • Advantageously, 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.
    • Brief description of the drawings
  • The invention will now be described further, by way of example, with reference to the accompanying drawings, in which :
    • Figures 1 and 2, as earlier described, show a hydraulic system as taught by EP 1 264 938 , and
    • Figures 3, 4 and 5 show a hydraulic system of the present invention in different positions of the carriage.
    Detailed description of the preferred embodiment(s)
  • To avoid unnecessary repetition, in Figures 3 to 5 components serving the same function as already described with reference to Figures 1 and 2 have been allocated similar reference numerals in the 100's series and will not be described a second time.
  • Instead of using two hydraulic jacks of equal stroke length and with the piston rods projecting from their respective cylinders in opposite directions, the hydraulic circuit of Figures 3 to 5 used two jacks 114, 116 of unequal stroke length and with their respective piston rods 114b and 116b projecting in the same direction from the cylinders 114a and 116a. The end of the piston rod 114b of the longer jack 116 is connected to the frame 112 by a pivot pin 122 while the end of the piston rod 116b of the shorter jack 116 is connected by a pivot pin 124 to a bracket 126 secured to the carriage 110. It will noted that 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 114b.
  • A guide plate 118 secured to the carriage 110 has a slot which receives a pin 120 fixed to joined cylinders 114a and 116a near to the end of the cylinder 116a from which the piston rod 116b projects. It would be possible to secure the slotted guide plate 118 to the cylinders 114a, 116a and the pin to the carriage 110 as was the case in the hydraulic circuit of Figures 1 and 2.
  • In Figure 3, the carriage 110 lies in its left hand position in the frame 112 with the piston rod 114b fully retracted and the piston rod 116b fully extended.
  • To move the carriage to the intermediate position shown in Figure 4, hydraulic fluid is applied to the larger face of the piston of the hydraulic jack. If necessary, 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 114b is fully extended as shown in Figure 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 Figure 5. In this second end position, the piston rod 114b is fully extended but the piston rod 116b is fully retracted.
  • To return the carriage 110 to its left hand end position of Figure 3, the above process is reversed. First pressure is applied to the larger face of the piston of the jack 116 and, if necessary to the smaller face of the piston of the jack 114, to overcome static friction and initiate movement of the carriage 110. On reaching the position in Figure 4 in which the piston rod 116b is fully extended, the smaller face of the piston of the jack 114 is used to overcome the dynamic friction and maintain the movement of the carriage 110 to the left.
  • It will be seen from the above description that the hydraulic circuit of Figures 3 to 5 overcomes all of the shortcomings of the prior art as described above.
  • First, is it noted that, because the bracket 126 does not project beyond the side of the frame, it does not interfere with the carriage reaching either of its end position.
  • Second, the maximum separation between the ends of the piston rods, as shown in Figure 5, is less than the full width of the support frame by the width of the carriage 110. Hence, the tendency for the cylinders 114a, 116a 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. Furthermore, in all positions of the carriage, the cylinders 114a, 116a are supported in the same central position, corresponding to the position of the pin 120.
  • Third, to initiate movement of the carriage in either direction, hydraulic fluid always acts on the large face of the piston of one of the two hydraulic jacks. There is therefore always available sufficient force to overcome static friction and to start the carriage moving. Furthermore, in contrast to the prior art, the same force is available to move the carriage in both of its end positions.
  • Last, it will be seen that 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 114b when it is extended. Another shield may be fixed to the underside of the part of the hydraulic cylinder 114a that projects beyond the cylinder 116a to protect the piston rod 116b when it is extended.

Claims (5)

  1. A kingpost assembly comprising a carriage (110), a guiding support frame (112), said kingpost assembly further comprising a hydraulic system for moving a carriage (110) guided for movement along a linear path by the guiding support frame (112), the hydraulic system comprising two hydraulic jacks (114,116), each having a cylinder body (114a,
    116a) and a piston rod (114b, 116b), wherein the cylinder bodies (114a, 116a) of the two jacks are joined to one another, the end of the first piston rod (114b) of one jack (114) is connected to the support frame (112) and the end of the second piston rod (116b) of the other jack (116) is connected to the carriage (110), characterised in that the two piston rods (114b, 116b) project from the same side of the joined cylinder bodies (114a, 116a) and in each end position of the carriage (110), the piston rod of a respective one of the jacks is fully extended while that of the other jack is fully retracted.
  2. A kingpost assembly as claimed in claim 1, wherein the joined cylinders (114a, 116a) of said hydraulic system are provided with a projecting pin (120) engaged in a slot in a guide (118) movable with the carriage (110) in order to prevent misalignment between the axes of the piston rods (114b, 116b) and the cylinders (114a, 116a) when under load.
  3. A kingpost assembly as claimed in claim 1 or 2, wherein the two jacks (114, 116) have strokes of unequal length and the second piston rod (116b) is connected to the side of the carriage (110) that is nearer to the side of the frame (112) to which the first piston rod (114b) is connected.
  4. A kingpost assembly as claimed in claim 3, wherein a fixed shield is mounted on the frame to protect the piston rod of the longer hydraulic jack when it is extended.
  5. A kingpost assembly as claimed in claim 3 or 4, wherein a shield is fixed to the part of the longer hydraulic cylinder (114a) that projects beyond the shorter cylinder (116a) to protect the piston rod (116b) of the short cylinder when it is extended.
EP10723105A 2009-06-03 2010-06-02 Kingpost assembly with hydraulically driven sideshift sliding carriage Active EP2438241B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000421A ITTO20090421A1 (en) 2009-06-03 2009-06-03 HYDRAULIC ACTUATOR FOR A SLIDING TROLLEY
PCT/EP2010/057748 WO2010139748A1 (en) 2009-06-03 2010-06-02 Hydraulic actuation for a sliding carriage

Publications (2)

Publication Number Publication Date
EP2438241A1 EP2438241A1 (en) 2012-04-11
EP2438241B1 true EP2438241B1 (en) 2013-03-13

Family

ID=41461023

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10723105A Active EP2438241B1 (en) 2009-06-03 2010-06-02 Kingpost assembly with hydraulically driven sideshift sliding carriage

Country Status (5)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9862297B2 (en) * 2015-03-04 2018-01-09 Selectrailers, L.L.C Vehicle trailer system
US10870960B2 (en) * 2017-02-28 2020-12-22 Todd E. Kautzman Snow and debris removal apparatus

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1950866U (en) * 1966-06-20 1966-12-01 Erich Kopschitz SPHERICAL DECORATIVE BODY.
DE1950866A1 (en) * 1969-10-09 1971-04-29 Eickhoff Geb Device for adjusting the stroke of preferably pneumatic cylinders, in particular for packaging machines or the like.
US3653131A (en) * 1970-03-24 1972-04-04 Ware Machine Works Inc Excavating apparatus
SU457777A1 (en) * 1972-11-28 1975-01-25 Предприятие П/Я В-2085 Machine tool for trench fragments
SU922054A1 (en) * 1980-09-26 1982-04-23 Северный Филиал Всесоюзного Научно-Исследовательского Института По Строительству Магистральных Трубопроводов Long-stroke hydraulic mechanism
US4564209A (en) * 1983-09-22 1986-01-14 Kingsley Bertis N Trailer hitch assembly
RU2049869C1 (en) * 1990-08-20 1995-12-10 Шаволов Андрей Сергеевич Working equipment of trenching machine
US5606809A (en) * 1994-07-16 1997-03-04 J. C. Bamford Excavators Limited Mechanical excavators
DE69705766T2 (en) * 1996-04-05 2002-05-23 Dhollandia, Naamloze Vennootschap Lifting device for use on a truck container
US6488464B1 (en) * 2000-04-26 2002-12-03 Rite Hite Holding Corporation Vehicle restraint with vertical float
GB0028197D0 (en) * 2000-11-18 2001-01-03 Passenger Lift Services Ltd Single-feed tandem cylinder
ITBO20010365A1 (en) * 2001-06-08 2002-12-08 New Holland Italia Spa EARTH-MOVING MACHINE AND ACTUATOR DEVICE FOR THE SIDE MOVEMENT OF A RELATIVE LOADER LOADER
US6688211B1 (en) * 2002-02-20 2004-02-10 Vu H. Viet Dual linear actuator

Also Published As

Publication number Publication date
US20120144998A1 (en) 2012-06-14
EP2438241A1 (en) 2012-04-11
RU2011153695A (en) 2013-07-20
WO2010139748A1 (en) 2010-12-09
ITTO20090421A1 (en) 2010-12-04
RU2559242C2 (en) 2015-08-10

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