US20120144998A1 - Hydraulic Activation for a Sliding Carriage - Google Patents
Hydraulic Activation for a Sliding Carriage Download PDFInfo
- 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
- Authority
- 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
Links
Images
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 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)
Abstract
A hydraulic system for moving a carriage guided for movement along a linear path by a support frame, such as a backhoe or an excavator. The system comprises two hydraulic jacks, each having a cylinder body and a piston rod. 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. In the invention, 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 extended while that of the other jack is retracted.
Description
- This application is the US National Stage filing of International Application Serial No. PCT/EP2010/057748 filed on Jun. 2, 2010 which claims priority to Italian Application TO2009A000421 filed Jun. 3, 2009, each of which is incorporated herein by reference in its entirety.
- 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.
- 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.
-
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. - In
FIGS. 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. Thecarriage 10 is guided to slide along astationary support frame 12 mounted transversely on the vehicle body, so that the carriage can move from an extreme left position, shown inFIG. 1 , to an extreme right position, shown inFIG. 2 . Thecarriage 10 is moved by a two hydraulic jacks orrams cylinders slotted guide plate 18 that receives apin 20 secured to thecarriage 10 by a fixed bracket (not shown). The end of thepiston rod 14 b of theupper jack 14 is connected by apivot 22 to thesupport frame 22 while the free end of therod 16 b of thejack 16 is connected by apin pivot 24 to abracket 26 projecting from the right hand side of thecarriage 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. - First, it will be noted from
FIG. 2 that in its right hand side position, thecarriage 10 stops short of the end right hand end of theframe 12 on account of the protrudingbracket 26. Shortening thebracket 26 does not solve the problem because the length of the twojacks - Second, the separation between the
pivot pins FIG. 2 is equal to the full width of theguide 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, thepin 20 in this right hand position of thecarriage 10 is at the very end of the cylinder of theupper jack 14 so that thepin 20 has little effect to prevent thepiston rod 14 b from being bent out of alignment with itscylinder 14 a. - A still further problem arises when pressure is applied to move the
carriage 10 away from its right hand end position shown inFIG. 2 . Thejacks FIG. 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 thecarriage 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 inFIG. 2 . - 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.
- The invention will now be described further, by way of example, with reference to the accompanying drawings, in which:
-
FIGS. 1 and 2 , as earlier described, 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. - To avoid unnecessary repetition, in
FIGS. 3 to 5 components serving the same function as already described with reference toFIGS. 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
FIGS. 3 to 5 used twojacks respective piston rods cylinders piston rod 114 b of thelonger jack 116 is connected to theframe 112 by apivot pin 122 while the end of thepiston rod 116 b of theshorter jack 116 is connected by apivot pin 124 to abracket 126 secured to thecarriage 110. It will noted that thepin 124 is located on the left side of thecarriage 110, that is to say the side nearer the side of theframe 112 connected to thepiston rod 114 b. - A
guide plate 118 secured to thecarriage 110 has a slot which receives apin 120 fixed to joinedcylinders cylinder 116 a from which thepiston rod 116 b projects. It would be possible to secure theslotted guide plate 118 to thecylinders carriage 110 as was the case in the hydraulic circuit ofFIGS. 1 and 2 . - In
FIG. 3 , thecarriage 110 lies in its left hand position in theframe 112 with thepiston rod 114 b fully retracted and thepiston rod 116 b fully extended. - To move the carriage to the intermediate position shown in
FIG. 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 thejack 116. The combined force is sufficient to initiate movement of thecarriage 110 to the right and this can continue until thepiston rod 114 b is fully extended as shown inFIG. 4 . Continued application of fluid under pressure to the smaller face of the piston of thejack 116 can apply sufficient force to overcome dynamic friction and keep the carriage moving until it reaches the right hand end position shown inFIG. 5 . In this second end position, thepiston rod 114 b is fully extended but thepiston rod 116 b is fully retracted. - To return the
carriage 110 to its left hand end position ofFIG. 3 , the above process is reversed. First pressure is applied to the larger face of the piston of thejack 116 and, if necessary to the smaller face of the piston of thejack 114, to overcome static friction and initiate movement of thecarriage 110. On reaching the position inFIG. 4 in which thepiston rod 116 b is fully extended, the smaller face of the piston of thejack 114 is used to overcome the dynamic friction and maintain the movement of thecarriage 110 to the left. - It will be seen from the above description that the hydraulic circuit of
FIGS. 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
FIG. 5 , is less than the full width of the support frame by the width of thecarriage 110. Hence, the tendency for thecylinders cylinders 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 thepiston rod 114 b when it is extended. Another shield may be fixed to the underside of the part of thehydraulic cylinder 114 a that projects beyond thecylinder 116 a to protect thepiston rod 116 b when it is extended.
Claims (6)
1. A hydraulic system for moving a carriage 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; and
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 extended while that of the other jack is retracted.
2. A hydraulic system as claimed in claim 1 , wherein the joined cylinders are provided with a projecting pin engaged in a slot in a guide movable with the carriage to prevent misalignment between the axes of the piston rods and the cylinders when under load.
3. A hydraulic system as claimed in claim 1 , wherein 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 to which the first piston rod is connected.
4. A hydraulic system 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 hydraulic system as claimed in claim 3 , wherein a shield is fixed to the part of the longer hydraulic cylinder that projects beyond the shorter cylinder to protect the piston rod of the short cylinder when extended.
6. A kingpost assembly comprising
a carriage and guiding support frame
a hydraulic system arranged for moving the carriage along a linear path by the 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, and
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO2009A000421 | 2009-06-03 | ||
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 (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 (en) |
EP (1) | EP2438241B1 (en) |
IT (1) | ITTO20090421A1 (en) |
RU (1) | RU2559242C2 (en) |
WO (1) | WO2010139748A1 (en) |
Cited By (2)
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)
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)
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 |
RU2049869C1 (en) * | 1990-08-20 | 1995-12-10 | Шаволов Андрей Сергеевич | Working equipment of trenching machine |
EP0805067B1 (en) * | 1996-04-05 | 2001-07-25 | Nv Nuyts Orb | Loading lift for the container of a truck |
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 |
-
2009
- 2009-06-03 IT IT000421A patent/ITTO20090421A1/en unknown
-
2010
- 2010-06-02 EP EP10723105A patent/EP2438241B1/en active Active
- 2010-06-02 RU RU2011153695/03A patent/RU2559242C2/en active
- 2010-06-02 WO PCT/EP2010/057748 patent/WO2010139748A1/en active Application Filing
- 2010-06-02 US US13/375,761 patent/US20120144998A1/en not_active Abandoned
Patent Citations (5)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016141255A1 (en) * | 2015-03-04 | 2016-09-09 | ENGELBRECHT, Frederick W. Anton | Vehicle trailer system |
CN107531175A (en) * | 2015-03-04 | 2018-01-02 | 理查德·艾伦·斯塔尔 | Vehicle trailer system |
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 |
---|---|
EP2438241A1 (en) | 2012-04-11 |
EP2438241B1 (en) | 2013-03-13 |
RU2011153695A (en) | 2013-07-20 |
ITTO20090421A1 (en) | 2010-12-04 |
WO2010139748A1 (en) | 2010-12-09 |
RU2559242C2 (en) | 2015-08-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7997369B2 (en) | Articulating cab assembly for excavator | |
EP2589563A1 (en) | Mobile lift crane with variable position counterweight | |
US20130074377A1 (en) | Telescoping Outrigger Systems | |
EP3406805A1 (en) | Working machine | |
US4103791A (en) | Shovel attachment means for hydraulic excavator | |
US5595471A (en) | Linkage arrangement | |
EP2438241B1 (en) | Kingpost assembly with hydraulically driven sideshift sliding carriage | |
US5494395A (en) | Driving machine with an articulated boom | |
US7452177B2 (en) | Working mechanism for construction machine | |
CN104975624A (en) | Telescopic type working device of sliding-steering loader | |
EP0287591B1 (en) | Boom for a vehicle | |
CN116607458A (en) | Two-stage lifting system for snow wings | |
EP3336262A1 (en) | Arm assembly | |
EP3574152B1 (en) | Jib assembly | |
US10941539B1 (en) | Telescoping stabilizer leg systems and methods | |
US8011873B2 (en) | Double cylinder tilt recovery system | |
CN109989436A (en) | A kind of excavator ejector dozer | |
EP0821751A1 (en) | Lift boom linkage system | |
US4271613A (en) | Excavator with articulated arms | |
KR101575347B1 (en) | Counterweight lifting system | |
US11555292B2 (en) | Heavy equipment boom system and method and hydraulic circuit therefor | |
EP2197779B1 (en) | Articulated mechanical arm | |
EP2067900A1 (en) | Machine stabilizer arrangement | |
JPS5914474Y2 (en) | Truck crane hydraulic jack control device | |
CN117627086A (en) | Blade and work machine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
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 |
Free format text: ABANDONMENT FOR FAILURE TO CORRECT DRAWINGS/OATH/NONPUB REQUEST |