WO2019111181A2 - Vérin - Google Patents

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Publication number
WO2019111181A2
WO2019111181A2 PCT/IB2018/059673 IB2018059673W WO2019111181A2 WO 2019111181 A2 WO2019111181 A2 WO 2019111181A2 IB 2018059673 W IB2018059673 W IB 2018059673W WO 2019111181 A2 WO2019111181 A2 WO 2019111181A2
Authority
WO
WIPO (PCT)
Prior art keywords
work
jack
locking
jacket
along
Prior art date
Application number
PCT/IB2018/059673
Other languages
English (en)
Other versions
WO2019111181A3 (fr
Inventor
Giuliano CATTINI
Original Assignee
Cattini Oleopneumatica S.R.L.
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 Cattini Oleopneumatica S.R.L. filed Critical Cattini Oleopneumatica S.R.L.
Publication of WO2019111181A2 publication Critical patent/WO2019111181A2/fr
Publication of WO2019111181A3 publication Critical patent/WO2019111181A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F5/00—Mobile jacks of the garage type mounted on wheels or rollers
    • B66F5/04—Mobile jacks of the garage type mounted on wheels or rollers with fluid-pressure-operated lifting gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/25—Constructional features
    • B66F3/30—Constructional features with positive brakes or locks

Definitions

  • the present invention relates to a jack.
  • Various jacks are known which are distinguished both for their shape and their dimensions and according to the load they are able to support.
  • known jacks are widely used in the industrial field, especially in those sectors which need to perform frequent maintenance operations on motorized heavy vehicles, such as e.g. earth moving machines.
  • this type of jack is provided with pneumatically or hydraulically powered work assemblies that allow lifting loads of the order of tens of tons.
  • the work assemblies are provided with at least one piston comprising at least one jacket element and one stem element coupled moveable with respect to one another to form at least one supply chamber, inside which a pneumatic or hydraulic pumping assembly pumps at least one fluid under pressure in order to move the piston.
  • the pumping assembly cuts off the piston supply and fixes the position thereof.
  • the pumping assembly must keep the fluid under pressure inside said supply chamber during the whole time in which the load has to be kept lifted.
  • known jacks are provided with locking means for locking the position of the piston which allow the load to be kept lifted even in the case in which the pumping assembly is deactivated.
  • the locking means also operate as safety systems that must be installed according to law on jacks of this type and prevent the sudden lowering of the load as a result of a malfunction of the jack, such as e.g. the involuntary shutdown of the pumping assembly.
  • the locking means generally used allow locking the piston only at a certain number of predetermined positions.
  • the jacks of this type do not allow direct verification of whether the fluid is under pressure inside the supply chamber despite the deactivation of the pumping assembly, e.g. following the locking of the piston by means of the locking means.
  • the main aim of the present invention is to provide a jack which allows locking the mutual position of the jacket element and of the stem element at any position along the stroke of the piston.
  • a further object of the present invention is to provide a jack which allows the pumping of air inside the supply chamber to be blocked after the piston limit switch has been reached.
  • An additional object of the present invention is to provide a jack which allows verifying whether the piston supply chamber is under pressure or not.
  • Another object of the present invention is to provide a jack which allows overcoming the aforementioned drawbacks of the prior art within the scope of a simple, rational, easy, efficient to use and cost-effective solution.
  • Figure 1 is an axonometric view of the jack according to the invention provided with ground movement means;
  • Figure 2 is a transparent view of the jack shown in Figure 1;
  • Figure 3 is an axonometric view of some components of the jack according to the invention.
  • Figure 4 is a broken view of the components shown in Figure 3;
  • Figure 5 is a front view of some components of the jack according to the invention in a home configuration
  • Figure 6 is a front view of the components shown in Figure 5 in a work configuration
  • Figure 7 is a sectional view of the components shown in Figure 5;
  • Figure 8 is a sectional view of the components shown in Figure 6;
  • Figure 9 is a bottom axonometric view of some components of the jack according to the invention.
  • Figure 10 is a sectional view of a component of the jack according to the invention in a first configuration
  • Figure 11 is a sectional view of the component shown in Figure 10 in a second configuration.
  • reference numeral 1 globally indicates a jack.
  • the jack 1 comprises:
  • At least one jacket 4 sliding around the stem 5 along a direction of work A, the jacket 4 and the stem 5 defining at least one supply chamber 3 for supplying at least one fluid; at least one pumping assembly for pumping the fluid inside the supply chamber 3 and adapted to move the jacket 4 along the direction of work A;
  • locking means for locking the jacket 4 with respect to the stem 5 along the direction of work A.
  • the supporting frame 2 is provided with ground movement means, in this case the wheels 12, as shown in figure 1.
  • the stem 5 and the jacket 4 are of substantially cylindrical shape and are coupled to one another to form a piston mounted on the supporting frame 2 substantially vertical and operable along the direction of work A for lifting/lowering the load.
  • direction used with reference to the direction of work A, it is meant to indicate a geometric type direction.
  • the pumping assembly is a pumping assembly of the hydraulic type provided with at least one hydraulic assembly 11.
  • the hydraulic assembly 11 is supplied by a compressor and, by means of a pressure multiplier, conveys the oil under pressure to the supply chamber 3 in order to move the jacket 4.
  • the pumping assembly is of a different type, e.g. of a completely hydraulic or electro- hydraulic type.
  • the jack 1 comprises activation means for activating the work assembly 4, 5 which are adapted to actuate the pumping assembly so as to move the jacket 4 along the stem 5 along the direction of work A.
  • the activation means comprise a fixed activation assembly mounted on the supporting frame 2 and a remote activation assembly associated with the supporting frame 2 by interposition of remote connection means and adapted to actuate the work assembly 4, 5 remotely.
  • the locking means comprise at least one locking element 8 of the jacket 4 associated in a moveable manner with the stem 5 along the direction of work A.
  • the locking element 8 is moveable in a continuous manner along the direction of work A between at least one work configuration, wherein the locking element 8 is in abutment against the jacket 4 locking the sliding thereof along at least one direction of backward travel C of the direction of work A, and at least a home configuration, wherein the locking element 8 is moved away from the jacket 4 allowing the movement thereof along the direction of work A.
  • direction of backward travel C and the term“direction of forward travel” D used with reference to the direction of work A, it is meant to indicate the direction of travel of the jacket 4 along the direction of work A close to the ground and away from the ground, respectively.
  • the locking element 8 is of a substantially discoidal shape having a radius of length comparable to that of the jacket 4 and provided with at least one central channel 13 having a radius of length comparable with that of the stem 5. This way, the locking element 8 surrounds the stem 5 which crosses the central channel 13, as shown in Figure 4.
  • the jack 1 comprises guide means 9a, 9b for guiding the locking means provided with at least one threaded portion 9a formed on at least one of the locking element 8 and the stem 5, and at least a nut screw portion 9b formed on the other of the locking element 8 and the stem 5 and kinematically coupled to the threaded portion 9a.
  • the threaded portion 9a is formed on the stem 5 and extends substantially along the entire length of the lateral surface thereof.
  • the nut screw portion 9b is formed on the locking element 8 and extends substantially along the entire internal surface of the central channel 13.
  • the locking element 8 is kinematically coupled to the stem 5 along which it can be screwed/unscrewed, exploring in a continuous manner substantially the entire length of the stem 5.
  • the jack 1 comprises movement means 7 for moving the locking means continuously along the direction of work A associated with the supporting frame 2.
  • the movement means 7 comprise:
  • the actuation means 14, 15 comprise at least one actuation motor 14 associated with the motion transmission means lOa, lOb.
  • the actuation motor 14 is also powered by the compressor which supplies the hydraulic assembly 11.
  • the actuation motor 14 is adapted to actuate the motion transmission means lOa, lOb.
  • actuation motor 14 is of a different type, e.g. of a hydraulic or electrical type.
  • the motion transmission means lOa, lOb comprise at least one fixed assembly lOa associated with the actuation means 14, 15 and provided with at least one shaft element 18 rotating around at least one axis of rotation B substantially parallel to the direction of work A, and at least one moveable motion transmission assembly lOb associated in a moveable manner with the fixed assembly lOa along the direction of work A and provided with:
  • At least one gear wheel 16 associated in a prismatic manner along the shaft element 18 and rotating with the shaft element 18 around the axis of rotation B;
  • the fixed assembly lOa comprises a plurality of gears 20 interposed between the actuation means 14, 15 and the shaft element 18.
  • a coupling hole having a substantially prismatic- shaped section which hole is adapted to house the shaft element 18, which has a substantially identical shape to that of the coupling hole.
  • the rotation of the shaft element 18 sets the gear wheel 16 in rotation, which, in addition to rotating, can slide along the body of the shaft element 18.
  • the sprocket 17, on the other hand, is formed on the lateral surface of the locking element 8 to form a gear wheel centered along the direction of work A and meshing the gear wheel 16.
  • the entraining means comprise a pair of circular side panels 19 arranged substantially opposite and parallel to each other and formed on the lateral surface of the locking element 8 substantially orthogonal to the direction of work A.
  • the teeth of the sprocket 17 are embedded between the circular side panels 19 and have a width substantially equal to the teeth of the gear wheel 16. This way, the gear wheel 16 which meshes the sprocket 17 is also partly embedded inside the circular side panels 19.
  • the actuation means 14, 15 comprise at least one manual actuation assembly 15 of the motion transmission means lOa, lOb.
  • the manual actuation assembly 15 comprises at least one shaped body associated with the fixed motion transmission assembly lOa and at least one key adapted to operate in conjunction with the shaped body so as to manually actuate the fixed motion transmission assembly lOa.
  • the shaped body is arranged outside the work assembly 4, 5 so as to be accessible by a specialized operator, which is able to actuate the gears 20.
  • the specialized operator rotates the key coupled to the shaped body and transmits the motion to the fixed assembly lOa which consequently transmits the motion to the moveable assembly lOb.
  • the locking element 8 can be moved manually by means of the manual actuation assembly 15.
  • the jack 1 comprises automatic stop means 21, 23 of the work assembly.
  • the stop means 21, 23 comprise at least one switch element 23 arranged at a predetermined height along the direction of work A and pressed in a sliding contact with the jacket 4, the switch element 23 deactivating the pumping assembly when the jacket 4 exceeds the predetermined height and releases the switch element 23.
  • the stop means 21, 23 comprise at least one holding ring 21 mounted on the supporting frame 2 substantially concentric to the direction of work A so as to surround the jacket 4 at the predetermined height.
  • predetermined height it is meant to indicate approximately the height of the stem 5 with respect to the supporting frame 2, i.e. the length of the maximum travel of the jacket 4.
  • the holding ring 21 comprises at least one compartment 22 inside which the switch element 23 is arranged.
  • the switch element 23 comprises at least one button 24 which extends protruding towards the center of the holding ring 21 and facing the jacket 4, which keeps it pressed when it is arranged below the predetermined height.
  • the switch element 23 is of a different type, e.g. wherein the switch element 23 comprises a proximity sensor configured to detect the presence of the jacket 4.
  • the jack 1 comprises detection means 36 of the fluid inside the supply chamber 3 associated with the supporting frame 2.
  • the detection means 36 comprise:
  • At least one containment body 26 associated in a fluid- operated manner with the supply chamber 3 and provided with at least one observation element 25;
  • At least one signaling assembly 27 contained in a moveable manner inside the containment body 26, the signaling assembly 27 being juxtaposed to the observation element 25 and visible from the outside of the containment body 26 when the fluid fills the supply chamber 3 and being moved away from the observation element 25 when the fluid does not fill the supply chamber 3.
  • the detection means 36 comprise at least one longitudinal sliding channel 28, 29 of the signaling assembly 27 formed inside the containment body 26 and having a substantially cylindrical shape.
  • the sliding channel 28, 29 is provided with at least a narrow section 28 and at least one expanded section 29 coaxial with the narrow section 28, but having a substantially longer radius than the latter.
  • the containment body 26 comprises at least one pair of end portions 31 defining the length of the sliding channel 28, 29 and at which the observation element 25 and the fluid- operated connection means 30 to the supply chamber 3 are respectively arranged.
  • observation element 25 is arranged at the narrow section 28 and the fluid- operated connection means 30 are arranged at the expanded section 29.
  • the containment body 26 comprises an abutment portion 32 formed projecting inside the narrow section 28 in the proximity of the observation element 25.
  • the signaling assembly 27 comprises a signaling element having a substantially cylindrical shape and comprises at least one narrow portion 33 having a radius and length comparable to those of the narrow section 28 and of an expanded portion 34 coaxial with the narrow portion 33 to form a substantially“T”-shaped body.
  • the expanded portion 34 has a radius comparable with that of the expanded section 29, but has a significantly smaller length.
  • the expanded portion 34 can slide inside the expanded section 29. Furthermore, the narrow portion 33 is colored so as to be readily visible when in the proximity of the observation element 25.
  • the observation element 25 is a dome made of transparent material.
  • the signaling assembly 27 comprises at least one elastic element 35 interposed between the abutment portion 32 of the containment body 26 and the expanded portion 34 of the signaling element 33, 34.
  • the elastic element 35 is a spring wound to the narrow portion 33 and arranged inside the narrow section 28 of the sliding channel 28, 29, as shown in Figure 10 and in Figure 11.
  • the operation of the jack 1 according to the invention is as follows.
  • the oil pumped inside the supply chamber 3 also flows inside the containment body 26 at the fluid- operated connection means 30.
  • the signaling element 33, 34 is visible through the observation element 25 by an operator who can verify if the supply chamber 3 is under pressure.
  • the actuation means 14, 15 transmit motion to the shaft element 18, which sets in rotation the gear wheel 16 which meshes the sprocket 17 so as to move the locking element
  • the locking element 8 is screwed along the stem 5 moving along the direction of work A in the direction of forward travel D.
  • the moveable motion transmission assembly 10b follows the locking element 8 integrally in translation along the direction of work A.
  • the locking element 8 is screwed along the stem 5 in a continuous manner until it reaches the jacket 4, whatever its position along the stem 5.
  • the jacket 4 rests firmly on the locking element 8 and the actuation motor 14 can be deactivated upon reaching the desired position.
  • the locking element 8 fixes the position of the jacket 4 by locking the sliding thereof in the direction of backward travel C.
  • the elastic element 35 arranged inside the containment body 26 expands as a result of the decrease in oil pressure and moves the signaling element 33, 34 away from the observation element 25.
  • the button 24 is released by locking the pumping of oil inside the supply chamber 3 by the pumping assembly.
  • the pumping assembly can only remove the oil from the supply chamber 3 so as to move the jacket 4 in the direction of backward travel C.
  • the locking means allow the jacket to be locked with respect to the stem in any position along the direction of work.
  • the guide means allow to progressively screw/unscrew the locking element substantially along the entire length of the stem, to which the locking element can be fixed substantially in any position.
  • stop means allow the pumping assembly to be deactivated automatically after the jacket has reached the limit switch.
  • detection means allows the operator to verify whether the supply chamber is under pressure or not after activation or deactivation of the pumping assembly.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Actuator (AREA)
  • Types And Forms Of Lifts (AREA)

Abstract

La présente invention concerne un vérin (1) comprenant : un cadre de support (2) ; - un ensemble de travail (4, 5) associé au cadre de support (2), conçu pour soulever une charge et pourvu : d'une tige (5) associée au cadre de support (2) ; d'une chemise (4) coulissant autour de la tige (5) le long d'une direction de travail (A), la chemise (4) et la tige (5) définissant au moins une chambre d'alimentation (3) pour fournir au moins un fluide ; d'un ensemble de pompage pour pomper le fluide à l'intérieur de ladite chambre d'alimentation (3) et conçu pour déplacer la chemise (4) le long de la direction de travail (A) ; de moyens de verrouillage pour verrouiller la chemise (4) par rapport à la tige (5) le long de la direction de travail (A), les moyens de verrouillage comprenant un élément de verrouillage (8) de la chemise (4) associé de manière mobile à la tige (5) le long de la direction de travail (A).
PCT/IB2018/059673 2017-12-05 2018-12-05 Vérin WO2019111181A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT201700140643 2017-12-05
IT102017000140643 2017-12-05

Publications (2)

Publication Number Publication Date
WO2019111181A2 true WO2019111181A2 (fr) 2019-06-13
WO2019111181A3 WO2019111181A3 (fr) 2019-07-25

Family

ID=61656169

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2018/059673 WO2019111181A2 (fr) 2017-12-05 2018-12-05 Vérin

Country Status (1)

Country Link
WO (1) WO2019111181A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021185923A3 (fr) * 2020-03-17 2021-11-18 Spinlock Lifting Equipment Ltd Dispositif de levage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2664073A (en) * 1950-11-14 1953-12-29 William S Pine Hydraulic jack
US5419533A (en) * 1993-07-20 1995-05-30 Bfj Company Lifting device
FR2857000B1 (fr) * 2003-07-02 2007-02-02 Rezabal Luis Idarreta Ecrou de securite progressant simultanement avec la tige du verin l'incorporant
US20130087752A1 (en) * 2011-10-10 2013-04-11 Norco Industries, Inc. Air lift jack with jack locking mechanism
CA2961164A1 (fr) * 2014-09-17 2016-03-24 Actuant Corporation Systeme de levage portable a auto-verrouillage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021185923A3 (fr) * 2020-03-17 2021-11-18 Spinlock Lifting Equipment Ltd Dispositif de levage

Also Published As

Publication number Publication date
WO2019111181A3 (fr) 2019-07-25

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