US3858396A - Device for feeding a hydraulic load element mounted on a telescopic structure, by means of two jacks - Google Patents

Device for feeding a hydraulic load element mounted on a telescopic structure, by means of two jacks Download PDF

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Publication number
US3858396A
US3858396A US377283A US37728373A US3858396A US 3858396 A US3858396 A US 3858396A US 377283 A US377283 A US 377283A US 37728373 A US37728373 A US 37728373A US 3858396 A US3858396 A US 3858396A
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United States
Prior art keywords
cylinder
piston
conduit
fluid
chamber
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Expired - Lifetime
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US377283A
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English (en)
Inventor
Bernard Bourges
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Poclain SA
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Poclain SA
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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
    • E02F3/30—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 with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/306—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 with a dipper-arm pivoted on a cantilever beam, i.e. boom with telescopic dipper-arm or boom
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/149—Fluid interconnections, e.g. fluid connectors, passages

Definitions

  • a hydraulic drive telescopic boom including two hydraulic piston-cylinder units connected between two telescopic boom sections and including fluid connections between the piston-cylinder units providing power transmission of hydraulic fluid from a pump to a load motor on the outer end of one boom section so as to substantially eliminate the need for flexible power conduits.
  • the present invention relates to a device for feeding a hydraulic load element mounted on a telescopic structure, by means of two jacks.
  • the invention intends to remedy this state of affairs and proposes to this end a new device, the adoption of which eliminates the earlier necessity of having to use flexible conduits in the telescopic zone of the structure.
  • the invention relates to a telescopic structure comprising two elements mounted to slide with respect to one another, whilst a drive device is coupled to these two elements in order to adjust the relative position therof.
  • a hydraulic load element connected selectively to a source of pressurised fluid and an exhaust reservoir, via inlet and delivery conduit connections fixed to a first of said two elements, is coupled to the second of these two elements.
  • This structure comprises a first fluid-actuated jack and a second fluid-actuated jack, each jack is of equal size and has a piston and associated rod so as to define small chambers of equal size on the rod side of each piston and large chambers of equal size on the opposite side of each piston.
  • One jack has its cylinder fastened to one telescopic element and its rod fastened to the other telescopic element while the other jack is coupled to the telescopic elements in exactly the reverse manner; consequently, the jacks are in mechanical opposition, so that the piston rod of a first of these two jacks and the cylinder of the second of said two jacks are integral in translation with the first telescopic element, whilst the piston rod of the second jack and the cylinder of the first jack are integral in translation with the second telescopic element.
  • Two transfer conduits are arranged in the piston rod of one of the two jacks and open out, on the one hand, outside the end of the said rod, which is opposite the piston of the corresponding jack, on the other hand, one of the transfer conduits on one side, the other transfer conduit on the other side, and near said piston, respectively, in the small and large chambers of said jack.
  • connection conduits each permanently connect the end of one of the transfer conduits to one of the two connections fixed to the cylinder of the other jack, one of these connections opening into one of the chambers of said other jack, and the other connection opening into the other chamber of this other jack, so that the small and large chambers of the two jacks are connected together.
  • connections of inlet and delivery conduits fixed on the first of the telescopic elements are connected by two first pipes, one to a small chamber, the other to a large chamber, via one of the members, piston rod or cylinder, of one of the jacks, which is integral with the first telescopic element.
  • the load element is connected by two pipes, one to a small chamber, the other to a large chamber, by means of one of the members, piston rod or cylinder, of one of the jacks, or the group of the two connecting conduits, which is integral with the second telescopic element.
  • the coupling of the jack, whose piston rod is provided with the two transfer conduits, is such that the cylinder of said jack is integral in translation with the first telescopic element.
  • the first pipes are connected respectively to the small and large chambers of said jack, by means of two connections which open out into said chambers and which are fixed to said cylinder.
  • the coupling of the jack, whose piston rod is provided with the two transfer conduits, is such that the cylinder of said jack is integral in translation with the first telescopic element.
  • the piston rod of the other jack which is also integral in translation with the first telescopic element, comprises two secondary transfer conduits, arranged in this piston rod. These secondary transfer conduits open out on the one hand to the outside of the end of said piston rod, which is opposite the piston of this other jack, on the other hand, one of said secondary transfer conduits on one side, the other secondary transfer conduit on the other side, and near the piston of said other jack, respectively in the small and large chambers of this other jack.
  • the first two pipes are respectively connected to the small and to the large chamber of said other jack by two connections of said secondary transfer conduits fixed to the outside of the end of the rod of the piston of this other jack.
  • the second pipes are connected to the small and large chambers of the jack, the cylinder of which is integral in translation with the second element, by means of two connections fixed on said cylinder.
  • the drive device is constituted by a third jack, the maximum stroke of each of the first and second jacks being at least equal to the maximum stroke of said third jack.
  • FIGS. 1 and 2 are schematic views corresponding to two distinct embodiments of a structure according to the invention.
  • FIG. 1 shows a schematic section through a telescopic jib constituted by two sliding sections 1 and 2.
  • a jack 3 is coupled between these two sections to permit the relative position thereof to be adjusted.
  • the cylinder 4 of this jack is integral with the section 2, whilst the piston rod 5 is articulated about axis 6 on section 1.
  • conduits 7 and 8 connect two conduits bored in the piston rod 5 and each respectively communicating on an op posite end with one of the respective chambers of the jack 3.
  • An opposite end of conduits 7 and 8 is connected to a selectively operable three-way distributor valve 13.
  • the delivery conduit 9 of a pump 10 which receives fluid through conduit 11 from reservoir 12,
  • distributor 13 also terminates at distributor 13, another conduit 14 connects said distributor 13 to said reservoir 12.
  • a calibrated discharge valve 15 is interposed on a conduit 16 connected in shunt on the conduit 9. The three positions of the distributor 13 correspond:
  • the first jack 19 includes a first cylinder 21 having a rod end from which a first piston 28 extends with the outer end of the first piston rod being pivotally connected to the telescopic section 1 about axis 25.
  • the inner end of the first piston rod 22 is connected to a first piston 38 to define a small chamber 36 on the rod side of the piston and a large chamber 37 on the other side of the piston as clearly illustrated in FIG. 1.
  • First cylinder 21 is pivotally connected at its head end to the second telescopic element 2 about an axis 23.
  • the second jack includes a second cylinder containing a second piston 31 from which a second piston rod 22 extends outwardly from a rod end of the cylinder with the outer end of the second piston rod 22 being pivotally connected to the second telescopic element 2 about axis 24 as shown in FIG. 1.
  • the head end of the second cylinder 27 is pivotally connected to the first telescopic element 1 about axis 26 and the piston divides the cylinder into a small chamber 20a and a large chamber 20b.
  • the second piston rod 22 comprises a partially hollow rod member in that it includes a first fluid transfer conduit 29 and a second fluid transfer conduit 30, which, it will be noted, are mounted for integral translation with the section 2. Additionally, the pump 10 and the reservoir 12, along with the distributor 13, are mounted for integral movement with the telescopic section element 1.
  • a first connector conduit 32 is in fluid communication with the first fluid transfer conduit 29 on one end by means of a rod connection on the end of the second rod 22.
  • the opposite end of the first connector conduit 32 is connected to a first small chamber fluid inlet and delivery connection means 49a adjacent the rod end of the first cylinder 21.
  • a second connector conduit 33 has one end connected to the second transfer conduit in rod 22 and has its other end connected to a first large chamber fluid inlet and delivery connection means 48a adjacent the head end of the first cylinder 21.
  • first connector conduit 32 provides continuous fluid communication between the small chamber 36 of the first cylinder 21 and the small chamber 20a of the second cylinder 27 while the second connector conduit 32 provides continuous fluid communication between the large chamber 37 of the first cylinder and the large chamber 20b of the second cylinder 27.
  • a conventional device for feeding pressurised fluid similar to the assembly of pump 10, reservoir 12 and distributor 13, is provided for feeding the motor 17.
  • This assembly is constituted by pump 39, which receives fluid from reservoir 12 by conduit 40, and delivers fluid in a conduit 41 connected to a distributor valve 42.
  • the pump 39 and the distributor 42 are integral with the section 1.
  • a conduit 43 is connected in shunt to the conduit 41 and connects this conduit 41 to the reservoir 12 with interposition of a calibrated discharge valve 44.
  • a conduit 45 connects the distributor 42 with the reservoir 12 and a first motor delivery conduit 46 is connected on one end to a connection 46a on the distributor valve means 42 and is connected on its other end to a second large chamber fluid inlet and delivery connection means 47b adjacent the head end of the second cylinder 27 to provide fluid communication with the large chamber 20b as shown in FIG. 1. Additionally, a second motor delivery conduit 47 is connected on one end by means of a connection 47a to the distributor valve 42 and on its other end to a second small chamber fluid inlet and delivery connection means 46b to provide fluid communication with the small chamber 20a of the second cylinder 27.
  • the distributor valve 42 is capable of selective movement to any one of three positions.
  • the distributor 42 provides communication between conduit 41 and conduit 46; in a second position; conduits 41 and 45 are placed in communication to return the flow from pump 39 to the reservoir 12 while the conduits 46 and 47 are blocked by the distributor and a third position in which the conduit 41 communicates with the conduit 46 and the conduit 45 communicates with conduit 47.
  • a first load motor control conduit 48 extends from the first large chamber fluid inlet and delivery connection means 48a on the head end of cylinder 21 to a connection 17b on the hydraulic motor 17.
  • a second load motor conduit 49 extends from the first small chamber fluid inlet and delivery connection means 49a on the rod end of cylinder 21 to a second connection 17a on the motor 17 for a purpose to become apparent.
  • the second embodiment of the invention illustrated in FIG. 2 employs almost all of the elements previously described in connection with the first embodiment.
  • the second embodiment differs from the first embodiment in that the first motor delivery conduit 46 is connected to a rod'connection 460 on the outer end of a first piston rod 50 in the first cylinder 21.
  • a first transfer conduit 51 is provided in the rod 50 to communicate with motor delivery conduit 47 which is connected to a rod connection 47c so that the conduit 47 is placed in communication with the small chamber 36 of the cylinder 21.
  • a second transfer conduit 50 is provided in the piston rod of the cylinder and communicates with the conduit 46 on one end via a rod connection 460 and has its other end communicating with the large chamber 37 of the cylinder 21 in FIG. 2.
  • the rod 5 returns into cylinder 4 and the section 2 returns into section 1. Then, the desired relative position being obtained, the distributor 13 is placed in its second position this enabling the sections 1 and 2 to be immobilised with respect to one another.
  • the distributor 42 is placed in its first position, which is shown in FIG. 1, the pump 39 delivers into conduit 41 and pipe 47.
  • the fluid which penetrates into chamber 20b does not act on the piston 31, the whole being maintained in position by the jack 3.
  • This fluid therefore escapes from chamber 20b through conduit 30.
  • connection 17b of the motor 17 it reaches connection 17b of the motor 17, which it actuates.
  • the fluid delivered by the motor 17 returns to reservoir 12 via the successive elements: 17a, 49, 36, 32, 29, 20a, 46 and 45.
  • the pump 39 and reservoir 12 were to be connected to connections 46b and 47b in one case, 460 and 47c in the other case, fixed to the element of one of the jacks 19 or 20 which is fixed with respect to said reservoir 12 and pump 39.
  • This fixed element is constituted by cylinder 27 in the structure of FIG. 1 and by the rod 28 in the structure of FIG. 2.
  • conduits 32 and 33 connect the rod 22 to cylinder 21, both fixed with respect to the section 2;
  • FIGS. 1 and 2 each have, further, an equivalent: that which is obtained by disposing the jacks l9 and 20 so as to fix the cylinders on the respective sections where the pistons of FIGS. 1 and 2 were fixed and vice versa. All the connections established in the arrangements of FIGS. 1 and 2 are furthermore retained, it being understood that the pump 39 is connected to the element cylinder or piston rod of the jacks 19 or 20 which is fixed with respect to section 1.
  • a power-actuated telescopic structure including outer and inner axially adjustable telescopic elements mounted to slide relative to one another, drive means operatively coupled to said telescopic elements to effect axial adjustment of said telescopic elements rela tive to each other, a hydraulic load motor having first and second power'input-exhaust connections drivingly connected to an external end of one of said telescopic elements, pump means having a power fluid output for connection to said drive means and inflow conduit means connecting said pump means to a supply reservoir of activating fluid, the improvement comprising: a first fluid pressure actuated jack including a first cylinder having a head end and a rod end, a first piston in said cylinder and a first piston rod extending from said first piston axially outwardly from the rod end of said first cylinder, means connecting said first cylinder to said inner telescopic element, means connecting an outer external end portion of said first rod to said outer telescopic element for integral translational movement with said telescopic elements, a second fluid pressure
  • conduit means providing fluid communication between the distributor valve and the large chamber and small chamber of one cylinder comprises a first motor delivery conduit connected to the small chamber of said second cylinder and a second motor delivery conduit connected to the large chamber of said second cylinder.
  • said drive means operatively coupled to said telescopic elements comprises a hydraulic jack including a cylinder connected to said inner adjustable telescopic element and a piston rod having an outer end connected to said outer adjustable telescopic element.
  • said means providing fluid communication between said small chambers and said large chambers includes first and second fluid transfer conduits extending internally along the length of said second piston rod each having an outer end terminating in a rod fluid connection means adjacent the outer end of said second piston rod, the inner end of said first fluid transfer conduit in said second piston rod terminating on one end in fluid communication with said second small chamber, the inner end of said second fluid transfer conduit in said second piston rod terminating on one end in fluid communication with said second large chamber, a first connector conduit extending between the fluid connection means on the outer end of said first fluid transfer conduit means and connector means on said first cylinder communicating with said first small chamber, and a second connector conduit extending between the fluid connection means on the outer end of said second fluid transfer conduit means and connector means on said first cylinder communicating with said first large chamber.
  • conduit means providing communication between the small chamber and large chamber of one of said cylinders respectively with the first and second power inputexhaust connections of said load motor are connected to opposite ends of said first cylinder.
  • conduit means providing fluid communication between the distributor valve and the large chamber and small chamber of one cylinder comprises a first motor delivery conduit and a second motor delivery conduit each in fluid communication with rod fluid connection means on the outer end of said first rod communicating with first and second fluid transfer conduits extending along the length of said first rod and having their inner ends in fluid communication respectively with said small chamber and said large chamber of said first cylinder.
  • said drive means operatively coupled to said telescopic elements comprises a hydraulic jack including a cylinder connected to said inner adjustable telescopic element and a piston rod having an outer end connected to said outer adjustable telescopic element.
  • conduit means providing communication between the small chamber and large chamber of one of said cylinders respectively with the first and second power inputexhaust connections of said load motor are connected to opposite ends of said first cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Actuator (AREA)
  • Earth Drilling (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Jib Cranes (AREA)
US377283A 1972-08-02 1973-07-09 Device for feeding a hydraulic load element mounted on a telescopic structure, by means of two jacks Expired - Lifetime US3858396A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7227878A FR2194895B1 (fr) 1972-08-02 1972-08-02

Publications (1)

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US3858396A true US3858396A (en) 1975-01-07

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US377283A Expired - Lifetime US3858396A (en) 1972-08-02 1973-07-09 Device for feeding a hydraulic load element mounted on a telescopic structure, by means of two jacks

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Country Link
US (1) US3858396A (fr)
JP (1) JPS4958607A (fr)
AR (1) AR196446A1 (fr)
BE (1) BE802167A (fr)
BR (1) BR7305739D0 (fr)
DE (1) DE2339292A1 (fr)
ES (1) ES417489A1 (fr)
FR (1) FR2194895B1 (fr)
GB (1) GB1402214A (fr)
IT (1) IT991932B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4294572A (en) * 1978-04-10 1981-10-13 Pattison Jack E Internal fluid communication system for power cylinders
EP0718444A1 (fr) * 1994-12-21 1996-06-26 Nikken Corporation Alimentation en huile sous pression pour excavation à grande profondeur d'excavation
EP0924158A1 (fr) * 1997-12-18 1999-06-23 Huning Umwelttechnik GmbH + Co. KG Appareil de travail
US20110126700A1 (en) * 2007-07-12 2011-06-02 Johannsen Thorkil J Undercarriage for a telescopic frame
EP2568084A1 (fr) 2011-09-07 2013-03-13 EPSILON Kran GmbH. Bras de grue télescopable
CN104105890A (zh) * 2012-02-16 2014-10-15 克斯美库股份有限公司 带助力机构的缸装置
CN104723149A (zh) * 2010-11-24 2015-06-24 克斯美库股份有限公司 带助力机构的缸装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160076A (en) * 1961-12-14 1964-12-08 Parker Hannifin Corp Fluid system and relief valve assembly therefor
US3481251A (en) * 1968-02-05 1969-12-02 Warner Swasey Co Machine with hydraulic boom

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160076A (en) * 1961-12-14 1964-12-08 Parker Hannifin Corp Fluid system and relief valve assembly therefor
US3481251A (en) * 1968-02-05 1969-12-02 Warner Swasey Co Machine with hydraulic boom

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4294572A (en) * 1978-04-10 1981-10-13 Pattison Jack E Internal fluid communication system for power cylinders
EP0718444A1 (fr) * 1994-12-21 1996-06-26 Nikken Corporation Alimentation en huile sous pression pour excavation à grande profondeur d'excavation
EP0924158A1 (fr) * 1997-12-18 1999-06-23 Huning Umwelttechnik GmbH + Co. KG Appareil de travail
US20110126700A1 (en) * 2007-07-12 2011-06-02 Johannsen Thorkil J Undercarriage for a telescopic frame
CN104723149A (zh) * 2010-11-24 2015-06-24 克斯美库股份有限公司 带助力机构的缸装置
EP2568084A1 (fr) 2011-09-07 2013-03-13 EPSILON Kran GmbH. Bras de grue télescopable
CN102992208A (zh) * 2011-09-07 2013-03-27 埃普斯隆起重机有限公司 可伸缩的起重臂以及具有该可伸缩的起重臂的起重机
CN104105890A (zh) * 2012-02-16 2014-10-15 克斯美库股份有限公司 带助力机构的缸装置
CN104105890B (zh) * 2012-02-16 2016-02-24 克斯美库股份有限公司 带助力机构的缸装置

Also Published As

Publication number Publication date
IT991932B (it) 1975-08-30
ES417489A1 (es) 1976-03-01
FR2194895B1 (fr) 1976-05-14
GB1402214A (en) 1975-08-06
BE802167A (fr) 1973-11-05
AR196446A1 (es) 1973-12-27
DE2339292A1 (de) 1974-02-21
JPS4958607A (fr) 1974-06-06
FR2194895A1 (fr) 1974-03-01
BR7305739D0 (pt) 1974-08-29

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