US3740952A - Hydraulic jack for use in garage - Google Patents

Hydraulic jack for use in garage Download PDF

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Publication number
US3740952A
US3740952A US00210326A US3740952DA US3740952A US 3740952 A US3740952 A US 3740952A US 00210326 A US00210326 A US 00210326A US 3740952D A US3740952D A US 3740952DA US 3740952 A US3740952 A US 3740952A
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Prior art keywords
valve
cylinder
hydraulic
hydraulic jack
pressure fluid
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Expired - Lifetime
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US00210326A
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English (en)
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Y Fujii
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Individual
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Individual
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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86928—Sequentially progressive opening or closing of plural valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/8741—With common operator

Definitions

  • the present invention relates generally to a hydraulic jack, and more particularly to a hydraulic jack for use in a garage, the jack being of the type in which a lift arm and hence a bearing plate can be controlled in re sponse to the extended length of a ram of a hydraulic cylinder mounted upon a carriage.
  • a hydraulic jack of the type described In a hydraulic jack of the type described, the working liquid under pressure is forced into the hydraulic cylinder mounted upon the carriage to extend the ram so as to raise the lift arm and hence the bearing plate. To lower the bearing plate, the working oil under pressure introduced into the hydraulic cylinder must be returned to a reservoir or the like in order to withdraw or retract the ram.
  • only one release valve is interposed between a working oil supply and discharge passages, and is opened when a pressure release foot pedal is depressed, to return the working oil under pressure in the hydraulic cylinder to a reservoir or the like.
  • the flow rate of the working liquid under pressure flowing into the reservoir is subject to change, depending upon the load exerted on the bearin g plate, so that the bearing plate lowering speed is dependent upon the load exerted on the bearing plate.
  • the prior art hydraulic jack cannot adjust its bearing plate lowering speed depending upon the load exerted on the bearing plate. That is, the lowering speed becomes too slow when a load exerted on the bearing plate is ligher than the maximum load from which a reference lowering speed is determined.
  • a lighter load is used to determine a reference lowering'speed, the bearing plate is lowered too suddenly when a heavy load is exerted on it.
  • One of the objects of the present invention is to provide an improved hydraulic jack for use in a garage having a lift arm and a bearing plate which can be low ered at two speeds when a pressure release foot pedal is applied in two steps so that, depending upon a load, a high or low lowering speed may be selected.
  • two release valves of respectively a small and large discharge capacities are disposed in parallel between a working oil supply and discharge passages of a hydraulic cylinder for raising and lowering a lift arm and hence a bearing plate in such a manner that the small capacity release valve is operatively connected to a pressure release foot pedal so as to be opened when the foot pedal is partially depressed, whereas the large capacity release valve has its actuating member operatively coupled to the pressure release foot pedal so as to be opened when the foot pedal is fully depressed. Therefore, when the foot pedal is applied, the small capacity release valve is opened first, and when the foot pedal is fully applied, the large capacity release valve is also opened so that the flow rate of the working fluid under pressure discharged from the hydraulic cylinder is varied in two steps. As a consequence, the speed in lowering the lift arm and hence the bearing plate can be varied in two steps, that is at slow and high lowering speeds.
  • an adjusting screw is interposed between the small and large capacity release valves so that when the foot pedal is fully depressed, the opening area of the large capacity release valve can be adjusted to freely adjust the lowering speed depending upon a load applied on the bearing plate.
  • a safety valve or pressure relief valve is incorporated in the large capacity release valve, and is directly communicated with a pump chamber so that when the pressure of the working fluid in the pump chamber rises in excess of a predetermined level, the relief valve is opened to directly return the working fluid under pressure from the pump chamber to the reservoir without flowing into the hydraulic cylinder.
  • FIG. 1 is a side view partly in section of a hydraulic jack in accordance with the present invention
  • FIG. 2 is a front view thereof
  • FIG. 3 is a longitudinal sectional view, on enlarged scale, of a hydraulic cylinder and a valve mechanism thereof;
  • FIG. 4 is a top view thereof
  • FIG. 5 is a side view thereof
  • FIG. 6 is a sectional view taken along the line of 6-6 of FIG. 3;
  • FIG. 7 is a sectional view taken along the line 7-7 of FIG. 3.
  • a carriage generally designated by reference numeral comprises two shaped or angle members disposed in parallel with and joined to each other by front and rear shafts 11 and 12 which carry front and rear wheels 13 and 14, respectively.
  • a lift arm 16 comprising a channel-like member is pivotably fixed on a shaft to the carriage l0, and a load bearing plate 18 is rotatably fixed to the upper end of the lift arm 16.
  • the upper and lower ends of parallel links 19 are pivoted to the bearing plate 18 and the carriage 10, respectively, with pins 20 and 21, and the links 19, the lift arm 16 and the bearing plate 18 constitute a parallel linkage, whereby the bearing plate 18 may be normally maintained horizontal irrespective of the rotation of the lift arm 16 about the pivot 15.
  • the rotation of the lift arm 16 can be effected by a hydraulic cylinder 22 mounted on the rear portion of the carriage 10, and a by driving mechanism generally designated by and comprising a valve mechanism 23 and a pump mechanism 24 for actuating the hydraulic cylinder 22.
  • the driving mechanism 25 is fixed to the carriage by arms 26 extending from both sides of the valve mechanism 23, and by screws 27 or the like.
  • the extreme end of a ram 28 of the hydraulic cylinder 22 is connected to a connecting plate 30 which interconnectes the ends of links 29. That is, the extreme end of the ram 28 is connected to the connecting plate 30 with a connecting pin 32 fitted into a hole 31 formed in the plate 30.
  • the other ends of the links 29 are connected by pivot pins 33 to the lower end of the lift arm 16 so that, when the ram 28 is extended, the lift arm 16 is rotated upwardly about its pivot pin 15.
  • the lift arm 16 may be lowered under the returning force of a spring 34 acting between the connecting plate 30 and the shaft 12 of the carriage l0, whil the ram 28 is retracted.
  • the hydraulic cylinder 22 has a double-cylinder construction comprising a cylinder 35 and a cover or outer casing 36 surrounding the cylinder 35 as best seen in FIG. 3, to define a tank chamber 37 therebetween.
  • the ram 28 is slidably fitted into the cylinder 35.
  • An opening or bore 38 is open at the end of the ram 28, and an opening or bore 39 of oval section is formed at a right angle to the opening 38.
  • a valve 41 fitted into the bore 38 normally closes the bore 38 under the force of a spring also fitted into the bore 38, and an actuating rod 43 is looselyfitted into the bore 39.
  • the actuating rod 43 has a pin 42 which extends through a communication passage between the bores 38 and 39 to ward the valve 41.
  • both the upper and lower ends of the actuating rod 43 engage with a bearing member 45 fitted into the cylinder 35, and are caused to be displaced toward the left in FIG. 3 in the bore 39.
  • the pin 42 causes the valve 41 to open so that the lower chamber 44 communicates through the bore 38, the oval bore 39, the space 46 between the cylinder 45 and the ram 28 and an opening 47 formed in the cylinder 35 near the opening end thereof, with the chamber 37.
  • the oil under pressure is returned from the lower chamber 44 to the tank chamber 37.
  • the pump mechanism 24 comprises a manually operated plunger pump having a pump cylinder 48 and a plunger 49 slidably fitted into the pump cylinder 48.
  • the plunger 49 reciprocates, the working oil or fluid is drawn into the pump cylinder 48 through a suction passage 50 formed in the valve mechanism 23 and a suction valve 51 inserted in the passage 50 from the tank chamber 37 of the hydraulic cylinder 22, the working fluid being forced into the lower chamber 44 of the hydraulic cylinder 22 through a discharge valve 52 and a supply passage 53 formed in the valve mechanism 23.
  • a communication passage 54 extending from the bottom of the pump cylinder 48 opens at the midpoint between the suction and discharge valves 51 and 52.
  • the other or upper end of the swing arm 58 is pivoted via a pivot pin 60 to an operating lever generally designated by 61.
  • the oscillation of the operating lever 61 about the pivot 60 is limited because the lower end 62 of the operating lever 61 engages with shoulders 63 and 64 of the swing arm 58.
  • a ball 65 is disposed to engage the either of notches or stepped portions 67 and 68 0f the end 62 of the operating lever 61, under the force of a spring 66.
  • the swing arm 58 rotates about the pivot 57 so that the pin 59 attached to the lower end of the swing arm 58 in engagement with the notch 55 of the guide 56 causes it to reciprocate.
  • the plunger 49 is reciprocated in the pump cylinder 48.
  • the ball 65 is released from the notch 67 so that the operating lever 61 is lowered forwardly until the lower end 62 is in engagement with the shoulder 64 of the swing arm 58, and the ball 65 is in engagement with the notch 65 of the lower end 62 of the operating lever 61.
  • the operating lever 61 may be maintained in storage position in parallel with the carriage 10 as indicated by the chain lines in FIG. 1.
  • the operating lever 61 is shown as comprising a rod 69 telescopically fitted into a cylinder 70.
  • the operating lever 61 When the operating lever 61 is extended, that is, when the cylinder 71 is extended, it may be locked in position by a snap ring fitted over the rod 69 for operation.
  • the cylinder 71 can be retracted to inoperative or storage position at which the length of the operating lever 61 becomes substantially equal to that of the carriage. This arrangement much facilitates the operation and storage of the operating lever 61.
  • the compression stroke can be limited because the guide 56 engages with the opening end of the pump cylinder 48, whereas the suction stroke can be limited as a stop 72 attached to the swing arm 58 engages with a stopper pin 73 extending from the carriage 10.
  • valve mechanism 23 interposed between the hydraulic cylinder 22 and the pump mechanism 24 incorporates a stepped release valve device comprising two release valves 75 and 76 of small and large capacities, respectively, which are in communication with the supply passage 53. These release valves 75 and 76 are actuated a stepped manner to be described in more detail hereinafter.
  • the small release valve 75 is normally pressed against the lower end of the valve bore 79 under the force of a spring 85 which is stressed between the small release valve 75 and a spring seat 84 at the lower end of the valve case 77, so that the communication between the oil supply passage 53 and the tank chamber 37 is interrupted.
  • a push rod 86 for opening the small release valve 75 is fitted into the upper bore 80 of the valve case 77.
  • the push rod 86 comprises a rod portion 87 extending from the lower end of the push rod 86 toward the upper end of the small release valve 75, and an upper rod portion 88 extending from the upper surface of the push rod 86.
  • a lower spring seat 89 is fitted over the upper small diameter rod portion 88, whereas an upper spring seat 90 is screwed to the upper end of the rod portion 88 to dispose, and a spring 91 is disposed between these upper and lower spring seats 89 and 90.
  • the lower spring seat 89 has such a diameter that it may be pressed to both the upper ends of the valve case 77 and the push rod 86. That is, the outer diameter of the lower spring seat 89 is made larger than that of the push rod 86 so that the push rod 86 may be maintained in a predetermined position under the force of the spring 91.
  • the large release valve 76 is interposed between the lower end of a valve case 92 inserted in the valve body 84 in parallel with the valve case 77 and the oil supply passage 53.
  • the large reease valve 76 is opened, the oil under pressure is forced into the tank chamber 37 of the hydraulic cylinder 22 from an annular chamber 93 (see FIG. 6) formed around the lower portion of the valve case 93, through the discharge passage 83.
  • a first lever 94 and a second lever 95 are pivotably fixed to a bracket 96 formed at the top of the valve body 74, with a common pivot pin 97 for actuating the small and large release valves 75 and 76 independently.
  • the first lever 94 extends backwardly downwardly of the carriage 10, and has a horizontal extension 98 having a pressure release pedal 99 which serves also as a hanger.
  • a plug 100 is screwed to the upper end of the first lever 94, and a ball 101 is interposed between the plug 100 and the upper end of the upper rod portion 88 of the small release valve 75.
  • the push rod 86 is forced to move downwardly against the spring 91 so that the small diameter lower rod portion 87 is extended beyond the lower end of the valve bore 89 to open the small release valve 75.
  • the ball 101 is interposed between the first lever 94 and the push rod 86.
  • an adjusting screw 102 extending downwardly to the upper end of the valve case 92 of the large release valve 76.
  • An opening 103 which is formed at the other end of the second lever 95 extending below the first lever 94 over the push rod 86 of the small release valve 75, is fitted loosely around the upper spring of the push rod 86 with a sufficient spacing therebetween, and a spring 104 is stressed between the other end of the second lever and the valve body 74 so that the adjusting screw 102 at the one end of the second lever 95 exerts pressure on the valve case 92 of the large valve case 76 under the force of the spring 104 against a spring 105 fitted over the lower reduced diameter portion of the valve case 92, thereby closing the large release valve 76.
  • the first and second levers 94 and 95 are spaced apart from each other by an appropriate distance.
  • the pressure-release foot pedal 99 When the pressure-release foot pedal 99 is partially depressed, only the push rod 86 is moved downwardly to open only the small release valve 75.
  • the pressure-release foot pedal 99 When the pressure-release foot pedal 99 is further depressed, the undersurface of the first lever 94 engages with the second lever 95 to cause the latter to move downwardly against the spring 104.
  • the adjusting screw 102 is released from the valve case 92, so that the valve case 92 is lifted under the force of the spring 105. Therefore, the large release valve 76 is now also opened.
  • the stroke at which the first lever 94 engages with the second lever 95 can be adjusted by the plug when it is appropriately rotated. Therefore, the time when the large release valve 76 is opened after the small release valve 75 can be appropriately adjusted. Since the foot pedal 99 can be fully depressed until the second lever 95 engages with the valve body 74, the degree of opening of the large release valve when the pressure release valve 99 is fully deoressed can be adjusted by rotating the adjusting screw 102.
  • the present invention provides a movable hydraulic jack having a stepped release valve device comprising the small and large release valves 75 and 76.
  • oil under pressure higher than a predetermined level is not forced into the hydraulic cylinder 22 when a load in excess of a predetermined loadis exerted on the lift arm 16, for which purpose a safety device for returning the oil under pressure directly from the pump mechanism 24 to the tank chamber 37 is incorporated in the valve case 92 of the large release valve 76.
  • a valve lock 106 is screwed into the valve case 92, and a T-shaped passage 107 is formed in the lower portion thereof, and is in communication with an annular groove 109 formed in the valve case 92 through a transverse or radial passage 108 formed in the valve lock 106.
  • the annular groove 109 is in communication with the pump cylinder 48 through the communication passage 110 formed in the valve body 74.
  • a relief valve 111 is disposed at the junction of the vertical and horizontal passage of the T-shaped passage 107, and is normally pressed against the lower end of the vertical passage thereof under the force of a spring 1 13. As a result, the passage 107 is normally closed so that the oil under pressure supplied from the pump cylinder is stopped.
  • the relief valve 111 is incorporated in the large release valve assembly as described above, no additional safety device is required to be installed between the oil supply and discharge passages 53 and 83.
  • This arrangement is advantageous in that the hydraulic circuit can be simple in construction.
  • the oil under pressure is channelled from the pump cylinder 48 to the relief valve 1 1 1 directly, so that the latter can be immediately opened in response to the increase of the pressure of the working oil in excess of a predetermined level.
  • a highly sensitive and very reliable safety device is provided.
  • a cover 117 is hinged with a pin 116 to the carriage to cover the adjusting plug 100 and the adjusting screw 102 of the valve mechanism 23.
  • Another cover 118 is provided which extends backwardly of the carriage 10 to cover the pressure release pedal 99 in order to prevent the latter from being depressed by error in operation.
  • the movable hydraulic jack in accordance with the present invention is adapted to be suspended at the pressure release pedal as described hereinbefore.
  • the air entrapped in the tank chamber 37 moves into the suction passage 50. Therefore, air would be drawn into the pump cylinder 48 instead of the working oil, and would mix with the working oil.
  • a suction pipe 120 having a filter 119 fixed at its free end is extended into the tank chamber from the suction passage 50 as shown in FIG. 3.
  • the filter 119 is always in the working oil in the tank chamber 37 even when the hydraulic jack is suspended so that the intrusion of the air into the suction passage 50 can be positively prevented.
  • the hydraulic jack in accordance with the present invention can be transported while being suspended in a manner described above, to a desired position.
  • the operating lever 61 is raised to extend the cylinder to its full extent, and is used to insert the hydraulic jack below an automobile or the like to be lifted. This can be facilitated as the carriage 10 is provided with the wheels 13 and 14.
  • the swing arm 58 oscillates about the pivot 57, whereby the plunger 49 of the pump mechanism 24 reciprocates in the pump cylinder 48 so that the working oil in the tank chamber 37 of the hydraulic cylinder 23 is suctioned into the pump cylinder 48 through the suction pipe 12, the suction passage 50, and the suction valve 51. Thereafter, the oil under pressure is introduced from the pump mechanism 24 to the lower chamber 44 of the hydraulic cylinder 22 through the discharge valve 52 and the oil supply passage 53. As a result, the ram 28 is extended from the cylinder 35, whereby the lower end of the lift arm 16 is moved to the right in FIG. 1 by the links 29 and the connecting plate 30.
  • the lift arm 16 is rotated about the pivot 15 in the direction indicated by the arrow A in FIG. 1.
  • the bearing plate 18 attached to the upper end of the lift arm 16 is lifted while it is maintained in horizontal position by the parallel links 19, whereby the automobile or the like is lifted.
  • the load exerted on the bearing plate 18 acts as a resisting force on the ram 28 through the links 29 and the connecting plate 30, so that the pressure of the working oil in the pump cylinder 48 is increased in proportion to the load.
  • the pressure of the working oil in the pump cylinder 48 is exerted on the relief valve 111 through the communication passage 110, the annular groove 109, the port 109, and the passage 107 so that if a load in excess of a predetermined level is exerted on the bearing plate 18, the oil under pressure from the pump cylinder 48 opens the relief valve 111 so that the oil under pressure is returned to the tank chamber directly through the axial groove 114 of the valve holder 122, the port or opening 115, the annular chamber 93 and the discharge passage 83 without flowing into the lower chamber 44 of the hydraulic cylinder 22. Therefore, even when the plunger 49 is reciprocated by the operating lever 61, the ram 28 of the hydraulic cylinder 22 is not actuated, whereby the lift arm 16 is maintained at the same height.
  • the actuating rod 43 engages with the bearing member 45 to be displaced toward the left in FIG. 1 so that the pin 42 is caused to displace to the left to open the valve 41.
  • the oil under pressure from the pump cylinder 48 is returned to the tank chamber through the port 38, the valve 41, the oval bore 39 and the port 47. Therefore the pressure of the working oil in the lower chamber 44 is maintained at a lower level. Therefore, the various part in the hydraulic cylinder can be prevented from being subjected to excess forces.
  • the pressure of the working oil may be set to be less than the pressure at which the relief valve 111 is opened, so that the base portion of the ram 28 and the bearing member 45 at the opening end of the cylinder 35 may have relatively low strength.
  • the pressure-release pedal 99 When it is desired to lower the lift arm 16 after it has been raised to a desired position, the pressure-release pedal 99 is depressed by half of the full stroke. Then the first lever 94 rotates about the pivot pin 97, and the plug 100 pushes the push rod 86 downwardly. As a result, the rod portion 87 opens the small release valve 75, so that the oil under pressure in the lower chamber 44 of the hydraulic cylinder 22 flows gradually to the tank chamber 37 through the oil supply passage 53, the lower bore 78 in the valve case 77, the valve bore 79 which is constricted, the upper bore 80, the radial bores 81 and the discharge port 83. Therefore, the bearing plate 18 and the lift arm 16 are gradually lowered to a desired position.
  • the pressure release pedal 99 When it is desired to quickly lower the bearing plate 18, the pressure release pedal 99 is depressed by its full stroke. The, the plug 100 of the first lever 94 pushes downwardly the push rod 86 to open the small release valve 75. When the first lever 94 engages with the second lever 95, the latter is caused to rotate about the pin 97 against the spring 104 so that the valve case 92 is raised under the force of the spring 105 to open the large release valve 76 in the manner described hereinbefore. Therefore the working oil under pressure in the lower chamber 44 of the hydraulic cylinder 22 is quickly returned to the tank chamber 37 not only through the small release valve 75 but also through the large release valve 76, the annular chamber 93 and the discharge passage 83. As a result, the bearing plate 18 can be quickly lowered.
  • a hydraulic jack for use in garages comprising a carriage
  • a lift arm mounted on said carriage for displacement between raised and lowered positions
  • a hydraulic cylinder also mounted on said carriage and having an extensible ram associated with said lift arm for raising and lowering of the same;
  • a pump mechanism for supplying hydraulic pressure fluid into said cylinder
  • valvemeans communicating with said cylinder for discharging hydraulic pressure fluid therefrom
  • valve means comprising a normally closed first valve operable for discharging said hydraulic pressure fluid from said cylinder at a first rate
  • valves comprising an arm mounted for pivoting movement

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Handcart (AREA)
  • Reciprocating Pumps (AREA)
US00210326A 1970-12-24 1971-12-21 Hydraulic jack for use in garage Expired - Lifetime US3740952A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45116682A JPS5027264B1 (zh) 1970-12-24 1970-12-24

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Publication Number Publication Date
US3740952A true US3740952A (en) 1973-06-26

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Application Number Title Priority Date Filing Date
US00210326A Expired - Lifetime US3740952A (en) 1970-12-24 1971-12-21 Hydraulic jack for use in garage

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US (1) US3740952A (zh)
JP (1) JPS5027264B1 (zh)
CA (1) CA953705A (zh)
DE (1) DE2164014C3 (zh)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339942A (en) * 1979-09-10 1982-07-20 Uno Svensson Hydraulically operated crimping tool
US4342216A (en) * 1980-11-10 1982-08-03 Gregory Jack T Limited stroke force delivering tool
US5113679A (en) * 1990-06-27 1992-05-19 Burndy Corporation Apparatus for crimping articles
US5152162A (en) * 1990-06-27 1992-10-06 Burndy Corporation System and method for crimping articles
US5195042A (en) * 1990-06-27 1993-03-16 Burndy Corporation Apparatus and method for controlling crimping of articles
US6035635A (en) * 1998-09-03 2000-03-14 Hung; Michael Hydraulic quick lifting unit of a jack
EP1176308A1 (en) * 2000-07-28 2002-01-30 Framatome Connectors International Hydraulic tool with forward surrounding reservoir
WO2014188032A1 (es) * 2013-05-20 2014-11-27 Melchor Gabilondo, S.A. Gato de carretilla con conjunto palanca abatible
US20160208829A1 (en) * 2015-01-20 2016-07-21 Brookefield Hunter, Inc. Fluid flow regulator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55165116U (zh) * 1979-05-15 1980-11-27

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339942A (en) * 1979-09-10 1982-07-20 Uno Svensson Hydraulically operated crimping tool
US4342216A (en) * 1980-11-10 1982-08-03 Gregory Jack T Limited stroke force delivering tool
US5113679A (en) * 1990-06-27 1992-05-19 Burndy Corporation Apparatus for crimping articles
US5152162A (en) * 1990-06-27 1992-10-06 Burndy Corporation System and method for crimping articles
US5195042A (en) * 1990-06-27 1993-03-16 Burndy Corporation Apparatus and method for controlling crimping of articles
US6035635A (en) * 1998-09-03 2000-03-14 Hung; Michael Hydraulic quick lifting unit of a jack
EP1176308A1 (en) * 2000-07-28 2002-01-30 Framatome Connectors International Hydraulic tool with forward surrounding reservoir
WO2014188032A1 (es) * 2013-05-20 2014-11-27 Melchor Gabilondo, S.A. Gato de carretilla con conjunto palanca abatible
US20160208829A1 (en) * 2015-01-20 2016-07-21 Brookefield Hunter, Inc. Fluid flow regulator
US9850923B2 (en) * 2015-01-20 2017-12-26 Brookefield Hunter, Inc. Fluid flow regulator

Also Published As

Publication number Publication date
CA953705A (en) 1974-08-27
JPS5027264B1 (zh) 1975-09-06
DE2164014A1 (de) 1972-07-13
DE2164014C3 (de) 1974-10-10
DE2164014B2 (de) 1974-03-07

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