US3904416A - Multistage cylinder - Google Patents

Multistage cylinder Download PDF

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Publication number
US3904416A
US3904416A US353612A US35361273A US3904416A US 3904416 A US3904416 A US 3904416A US 353612 A US353612 A US 353612A US 35361273 A US35361273 A US 35361273A US 3904416 A US3904416 A US 3904416A
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cylinder
piston
supply
cylinder tube
rod
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US353612A
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English (en)
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Toshiaki Onoda
Yoshimasa Ito
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    • 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
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/16—Special measures for feedback, e.g. by a follow-up device
    • 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
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/03—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type with electrical control means

Definitions

  • a multistage cylinder comprises at least a first-stage 92/113, 65, 163, 164, 169; 91/167, 35 cyiinder and a second-stage cylinder provided essentiaily in the piston rod of the first-stage cylinder, the [56] Referen Cit d first-stage and second-stage cylinders being capable of UNITED STATES PATENTS operating separately and independently of each other, 1173.358 91,!939 Ernst n X whereby they can even operate in opposite d1rect10ns. 2,397,106 3/1946 Hailcr 92/52 X 11 (3131111, 7 Drawing Figures 32 35 CONTROL L POSITiON DETEC 51GNAL GEN AIR
  • This invention relates generally to a multistage cylinder and more particularly to a multistage cylinder in which a plurality of cylinder tubes can be individually actuated independently of each other by a fluid such as an oil or air.
  • a conventional multistage cylinder cannot undergo such a complicated extension and contraction action of differing mode for each operational action, and it has not been possible to use a conventional multistage cylinder in an automatic device as described above.
  • cylinders in general, there are servo-cylinders capable of assuming any position in extension or contraction and so-called on-off cylinders capable of assuming only two positions, i.e., an extended position and a retracted position. While a servocylinder is capable of assuming any extensioncontraction length, it requires a servo system for its operation and is therefore expensive. Another disadvantage of a servo-cylinder is that it is difficult to assembly in multiple stages. On the other hand, while the on-off cylinder is relatively inexpensive and is of a relatively simple organization, it has the drawback of not being capable of assuming any desired extension-retraction position.
  • an object of the invention is to provide a multistage cylinder in which cylinders of a'plurality of stages can operate individually and indepen dently of each other in the same or mutually opposite directions.
  • Another object of the invention is to provide a multistage cylinder capable of assuming any extension-retraction position through the use of a single servo-cylinder and one or more on-off cylinders.
  • Still another object of the invention is to provide a multistage cylinder which is highly effective when applied to apparatuses, particularly industrial robots and the like.
  • FIG. Us a combination of a side view in longitudinal section of one embodiment of a multistage cylinder according to the present invention and a block diagram showing one embodiment of a control system thereof;
  • FIGS. 2A and 2B are respectively a side view in longitudinal section and a section taken along line IIII in FIG. 2A of a second embodiment of a multistage cylinder according to the invention
  • FIG. 3 is a side view in longitudinal section of a third embodiment of a multistage cylinder according to the invention.
  • FIG. '4 is a side elevation, with parts cut away and parts shown in longitudinal section, showing one embodiment of an automatic carrying and loading machine to which the multistage cylinder of the invention is applied;
  • FIG. 5 is a simplified schematic diagram showing the essential organization of a more specific and practical embodiment of the control system shown in FIG. 1 in the case where air is used for the working fluid of system;
  • FIG. 6 is a simplified schematic diagram showing the essential organization of a still more specific embodiment of the control system shown in FIG. 1 in the case where an oil is used for the working fluid of the system.
  • first piston 16 Within the first cylinder tube 11, there is slidably fitted a first piston 16, to which is fixed the inner end of a first piston rod 17 of hollow cylindrical shape, which is slidably fitted in and through a hole 18 formed coaxially in the rod cover 13, a gas-tight packing being interposed between this piston rod and the rim of the hole.
  • first piston rod 17 of hollow cylindrical shape
  • piston 16 piston rod 17 of hollow cylindrical shape
  • supply and discharge pipes 14 and 15 constitute a first-stage cylinder l9.
  • a second cylinder tube fixed at the inner end thereof to the first piston 16.
  • the other ends of the first piston rod and the second cylinder tube 20 are secured to a second rod cover 21 with gas-tight packings interposed therebetween.
  • the outer diameter of the second sylinder tube 20 is less than the inner diameter of the first piston rod 17, and a cylindrical space 22 is formed between the first piston rod 17 and the second cylinder tube 20.
  • a supply-discharge pipe 23 for pressurized fluid communicating with the space 22.
  • a plurality of holes 24 aare formed in the cylindrical wall of the cylinder tube 20. These holes 24 also communicate with the space 22.
  • the multistage (two-stage) cylinder of the above described construction according to the invention operates as follows.
  • the working fluid (air) under pressure is supplied through the supply-discharge pipe 14 into the chamber between the head cover 12 and the first piston 16, the piston 16 and the first piston rod 17 are forced outward or toward the right as viewed in FIG. 1.
  • pressurized air is supplied through the supply-discharge pipe 23, it passes through the space 22 and holes 24 into the chamber 30, whereby the secondpiston 25 and the second piston rod 26 are forced outward.
  • pressurized air is supplied through the supply-discharge pipe 28, the second piston 25 and rod 26 are forced inward.
  • the supply and discharge of pressurized air through these supply-discharge pipes 14, 15, 23, and 28 are controlled by a control system of the following organization and operation.
  • a control system In this control system, a program for a prescribed operation of the multistage cylinder is previously stored, and in accordance with this program, a signal is generated by a signal generator 31 and sent to a controller 32 and changeover valve 33.
  • the controller 32 and the changeover valve 33 are supplied with pressurezed air from an air source 34.
  • the changeover valve 33 operates in accordance with the signal from the signal generator 31 to changeover the destination of delivery of pressurized air from the air source 34, thereby to supply the air to either the aforementioned supply-discharge pipe 23 or 28.
  • the second piston 25 is forced to slide outward to the outward end of its stroke, while when the pressurized air is supplied to the pipe 28, the piston 25 is forced to slide inward to the inward end of its stroke.
  • the piston 25 changes its position between only the two positions, namely, those of the outer end and the inner end of its stroke, and the second-stage cylinder 29 operates on an onoff cylinder.
  • first-stage and second-stage cylinders 19 and 29 are adapted to operate separately, as mentioned hereinabove, it is not necessary in all case to construct them coaxially in a strict sense, an eccentric construction also being possible. Accordingly, a centering step in the assembly or fabrication of each cylinder is not necessary, whereby production of the cylinder is facilitated.
  • the piston rod 43 of the first-stage cylinder 41 serves doubly as the cylinder tube of a second-stage cylinder 42.
  • the inner end of a supplydischarge pipe 45 is secured to the piston rod and cylinder tube 43 near its inner end fixed to the piston 16, the interior of this pipe 45 being communicative via a hole in the wall of the tube 43 with the interior thereof.
  • This supply-discharge pipe 45 except for its inner end, is parallel to the axis of the multistage cylinder 40 and passes through the rod cover 44, being guided in sliding movement relative thereto by a guide 46.
  • the second-stage cylinder 42 comprises the cylinder tube 43, a second pistion 25, a second piston rod 26, the outer (right-hand) wall surface of the piston 16, a second rod cover 47, the supply-discharge pipe 45, and a supply-discharge pipe 28 connected to and passing through the rod cover 47.
  • the supply-discharge pipe 14 is communicatively connected to a space defined by the head cover 12, cylinder tube 11, and piston 16, while the supplydischarge pipe 15 is communicatively connected to a space defined by the piston 16, cylinder tube 11, piston rod 43, and rod cover 44.
  • the supply-discharge pipe 45 is communicatively connected to a space defined by the pistons 16 and and the cylinder tube 43, while the supply-discharge pipe 28 is communicatively connected to a space defined by the piston 25, cylinder tube 43, and rod cover 47.
  • the piston 16 is actuated in sliding movement by pressurized air supplied and discharged through the supply-discharge pipes 14 and 15, while the piston 25 is similarly actuated by pressurized air supplied and discharged through the supply-discharge pipes 45 and 28.
  • the possibility of mutually independent operations of the pistons 16 and 25 is the same as that in the preceding first embodiment, and for their control, the control system illustrated in FIG. 1 can be applied.
  • FIG. 3 A third embodiment of a multistage cylinder according to the present invention will now be described in conjunction with FIG. 3.
  • This multistage cylinder 50 has a first-stage cylinder 51 comprising a cylinder tube 52, a head cover 53, a piston 54, a piston rod 55, a rod cover 56, and supplydischarge pipes 57 and 58 connected to the cylinder tube 52 respectively near the inner and outer ends thereof.
  • a supply-discharge pipe 59 is passed through and fixed to the center of the piston 54 and extends out through a center hole 60 in the head cover 53, being fitted slidably but in a gastight manner in this center hole 60..
  • the piston rod 55 serves doubly as a cylinder tube of a second-stage cylinder 61 and is provided at its outer end with a rod cover 62 fixed thereto in a gas-tight manner.
  • This cylinder tube 55 is provided near its outer end with a supply-discharge pipe 63.
  • the second-stage cylinder 61 comprises the cylinder tube 55, the piston 54 serving doubly as a head cover, the rod cover 62, a piston 25 slidably fitted within the cylinder tube 55, a piston rod 26 fixed at its inner end to the piston 25 and extending out through the center of the rod cover 62, and the supply-discharge pipes 59 and 63.
  • the above mentioned supply-discharge pipe 57 is communicatively connected to a space defined by the head cover 53, the cylinder tube 52, and the inner (lefthand) wall surface of the piston 54, while the supplydischarge pipe 58 is communicative with a space defined by the piston 54, the cylinder tube 52, the piston rod 55, and the rod cover 56.
  • the supply-discharge pipe 59 is communicative with a space defined by the piston 54, the cylinder tube 55, and the piston 25.
  • the supply-discharge pipe 63 is communicative with a space defined by the cylinder tube 55, the piston 25, and the rod cover 62 the piston 25 has leg parts 25b acting as the stop means.
  • the piston 54 of the first-stage cylinder 51 is actuated in sliding movement by pressurized air supplied and discharged through the supply-discharge pipes 57 and 58, while the piston 25 of the second-stage cylinder 61 is similarly actuated by pressurized air supplied and discharge through the supplydischarge pipes 59 and 63.
  • the possibility of mutually independent operations of the pistons 54 and 25 is the same as that in the preceding embodiments, and for their control, also, the control system shown in FIG. 1 can be applied.
  • FIG. 4 illustrates one embodiment of a robot for industrial use for performing the operation of convey ing and loading specific articles, which have been successively supplied to a specific supply position, in prescribed numbers successively to and onto shelves of progressively varying height.
  • a hollow stationary column 71 is fixedly held in upright position by a support structure 72 on a floor surface 87.
  • bearing means rotatably supporting the proximal end parts of upper and lower arms 73 and 74, respectively.
  • These arms 73 and 74 are respectively fixed to the upper and lower ends of a rotatable shaft 76 disposed coaxially within the stationary column 71.
  • the distal ends of the arms 73 and 74 are joined by a tie rod 75 fixed at its upper and lower ends thereto and disposed parallelly to the stationary column 71.
  • a pinion 77 is provided on the proximal part of the lower arm 74 and is meshed with and driven by a rack 78 driven by motive power means (not shown).
  • a slider 79 is slidably fitted around the stationary column 71 at approximately its middle part and can thereby slide vertically relative to the column 71.
  • This slider 79 is pin-connected to the outer end of a piston rod 81 of a cylinder 80 for up-and-down movement pin-connected at its head cover end to a part of the support structure 72.
  • a rotor 82 is fitted on the stationary column 71 in a manner permitting vertical sliding and rotational movements and is resting rotatably on the slider 79. This rotor 82 is actuatable through an arm 83 to rotate unitarily with the rod 75.
  • the rotor 82 supports a multistage cylinder 84 according to this invention, as exemplified by any of the above described cylinders 10, 40, and 50, the multistage cylinder 84 being mounted at its head-cover end on the rotor 82.
  • a grasping device 86 for grasping the aforementioned specific articles is mounted on the outer end of the piston rod 85 of the second-stage cylinder of this multistage cylinder 84.
  • the sliding of the rack 78 causes the pinion 77, and therefore the arm 74, to rotate. Consequently, the shaft 76, arm 73, rod 75, rotor 82, and multistage cylinder 84 all rotate unitarily with the arm 74 about the axis of the shaft 76, whereby the grasping device 86 swings in a horizontal plane.
  • Operation of the cylinder 80 causes its pistion rod 81 to move out or inv thereby to actuate the slider 79, rotor 82, and multistage cylinder 84 in upward or downward movement, whereby the grasping device 86 is moved vertically up or down.
  • the grasping device 86 can be caused by the operation of the multistage cylinder 84 to move horizontally toward or away from the stationary column 71.
  • the grasping device 86 By causing the grasping device 86 to carry out the operations of grasping and releasing the articles to be handled together with the combination of the above described rotation, vertical movement, and horizontal displacement, it is possible to cause the robot machine 70 to perform readily complicated operations such as loading articles at a specific height position of a prescribed number thereof on each of a plurality of shelves of successively varying height.
  • FIG. 5 The embodiment illustrated in FIG. 5 is applied to the control of multistage cylinder actuted by pressurized air as the driving fluid.
  • parts which are the same or equivalent to those in FIG. 1 are designated by like reference numerals, but detailed description thereof will not be repeated.
  • Pressurized air is supplied by a pressurized air source 90 by way of a pressure-reducing valve 91 to a manifold 92, where the pressurized air is branched and supplied through pipes 93, 94, 95, and 96.
  • the pipe 93 is communicatively connected to a nozzle and the aforementioned supply-discharge pipe 14, and the pipe 94 is communicatively connected to a nozzle in opposed relation to the nozzle 97 and to the aforementioned supply-discharge pipe 15.
  • a shield plate 99 pivotally supported at one end thereof.
  • This shield plate is pulled toward one side (toward the nozzle 97) by a counter spring 100 and toward the opposite side by a spring 102 provided on a position detection member 101 fixed to the rod cover 21, which is fixed to the piston rod 17 of the first stage cylinder
  • the pressurized air in the pipe 95 is supplied through a pressure-reducing valve 103 to an electropneumatic converter 104 where it is converted into a pneumatic signal of a pressure in accordance with an electrical signal from the signal generator 31.
  • This pneumatic signal is supplied by way of a pipe 105 to a diaphragm chamber 106 to determine a displaced position of the shield plate 99.
  • the air discharges from the nozzles 97 and 98 are controlled, whereby the manner in which air from the pipes 93 and 94 are supplied to the supply-discharge pipes 14 and 15 and the manner in which air is discharged from the pipes 15 and 15 are controlled, and the first-stage cylinder 19 shown in FIG. 1 is operated as a servocylinder.
  • the pressurized air in the pipe line 96 is supplied to a changeover valve 33.
  • This changeover valve 33 comprises an electromagnetic changeover valve, for example, wherein solenoids 33a and 33b operate in accordance with an electrical signal from the signal generator 31 to carry out valve changeover.
  • the pressurized air is suppled to the supply-discharge pipe 23 or 28.
  • the supply-discharge pipe which is not supplied with pressurized air is communicative by way of the changeover valve 33 with the atmosphere. Therefore, the second-stage cylinder is activated only by the existence or absence of the supply of pressurized air and operates as an on-off cylinder.
  • FIG. 6 illustrates an embodiment of a control system in the case where an oil is used as the driving fluid.
  • Pipes 111 and 112 from an oil pressure source are connected by way of a servovalve 113 to the supplydischarbe pipe 14 or 15.
  • position detection of the piston rod 17 of the first-stage cylinder 19 is carried out by a position detector 114 comprising a differential transformer in accordance with the displacement of a position detecting member 101 fixed to the rod cover 21 which is fixed in turn to the piston rod 17 of the first-stage cylinder 19.
  • a servo-amplifier 115 receives an electrical signal from the signal generator and the detection output of the position detector 114 to produce a resulting output whereby the servovalve 113 is controlled, and supplying and discharging of pressurized oil through the supply-discharge pipes 14 and 15 are so carried out that the piston rod 17 of the first-stage cylinder 19 moves accurately to the position designated by the signal from the signal generator 31. Accordingly, the first-stage cylinder operates as a servo-cylinder.
  • pipes 116 and 117 are connected between the oil pressure source 110 and the changeover valve 33.
  • the changeover valve 33 is caused to carry out changeover switching of connections of supplydischarge pipes 23 and 28 and pipes 116 and 117 by solenoids 33a and 33b activated by a signal from the signal generator 31. Accordingly, the second-stage cylinder is operated only in accordance with whether or not pressurized oil is being supplied thereto and operates as an on-off cylinder.
  • a multistage cylinder having at least a first-stage cylinder and a second-stage cylinder, in which: the first-stage cylinder comprises a first cylinder tube,
  • a first rod cover fixed to the other end of the first cylinder tube and having a hole through which the first piston rod slidably extends
  • a first supply-discharge pipe constituting a communicative passage through the head cover from outside of the multistage cylinder to a first space defined within the first cylinder tube by the head cover and the first piston and functioning to supply and discharge a fluid to and from said first space
  • a second supply-discharge pipe constituting a communicative passage through the first rod cover from outside of the multistage cylinder to a second space defined within the first cylinder tube by the first piston and the first rod cover and functioning to supply and discharge a fluid to and from said second space
  • the second-stage cylinder comprises a second cylinder tube disposed within the first piston rod with a specific clearance space therebetween and fixed at one end thereof to the first piston,
  • said second cylinder tube being provided with an opening near the part thereof fixed to the first piston, said opening for communicating a third space defined within the second cylinder tube by the first piston and the second piston with the specific clearance space,
  • a clearance member for maintaining a clearance between the first and second pistons so that the second piston does not close the opening of the second cylinder tube when the second piston is slid to the closest position to the first piston.
  • a third supply-discharge pipe constituting a communicativc passage to the specific clearance space from outside of the multistage cylinder and functioning to supply and discharge a fluid to and from said third space through the specific clearance space
  • a fourth supply-discharge pipe constituting a communicative passage through the second rod cover from outside of the multistage cylinder to a fourth space defined within the second cylinder tube by the second piston and the second rod cover and functioning to supply and discharge a fluid to and from said fourth space

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Servomotors (AREA)
  • Fluid-Pressure Circuits (AREA)
US353612A 1973-01-31 1973-04-23 Multistage cylinder Expired - Lifetime US3904416A (en)

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JP1270873A JPS5321073B2 (de) 1973-01-31 1973-01-31

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Cited By (15)

* Cited by examiner, † Cited by third party
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US4033250A (en) * 1975-06-18 1977-07-05 The Babcock & Wilcox Company Pneumatic buffering system
US4323002A (en) * 1977-08-10 1982-04-06 Fletcher Sutcliffe Wild Limited Hydraulic equipment
US4368662A (en) * 1979-03-09 1983-01-18 Industrie-Werke Karlsruhe Augsburg Aktiengesellschaft Zweignieder-Lassung Keller & Knappich Cylinder arrangement for friction-welding machine
US4370982A (en) * 1980-09-10 1983-02-01 Medrad, Inc. Method and apparatus for injecting and for controlling the pressure of fluid being injected into a catheter
US4800723A (en) * 1984-06-13 1989-01-31 Centre National De La Recherche Scientifique Electrically-driven opposed flexible bellows pump and position-controlled opposed flexible bellows jack system
US4939983A (en) * 1988-02-11 1990-07-10 Reinhard Lipinski Fluid pressure operated positioning apparatus
US5111733A (en) * 1990-03-06 1992-05-12 Ppm Multiple stage hydraulic jack for use with telescopic jib
US5255591A (en) * 1991-10-03 1993-10-26 Nathan Gottlieb Fluid powered indexing apparatus
US5411174A (en) * 1992-02-11 1995-05-02 Optima-Maschinenfabrik Dr. Buhler Gmbh & Co. Emptying balance having a product flow setting device
US5909921A (en) * 1997-04-11 1999-06-08 Nesbeth; Roleto E. Lift device and system for a pick-up truck cargo cover
US20050029690A1 (en) * 2003-08-08 2005-02-10 George Burlow Method and apparatus for manufacturing compressed earthen blocks
US20130119196A1 (en) * 2010-11-22 2013-05-16 The Boeing Company Hydraulic Strut Assembly for Semi-Levered Landing Gear
CN105782164A (zh) * 2016-05-26 2016-07-20 中国人民解放军国防科学技术大学 多腔体液压缸及其控制系统和控制方法
CN105889167A (zh) * 2014-12-12 2016-08-24 唐维 自锁式多级液压油缸
US10246951B2 (en) 2014-02-06 2019-04-02 Ensign Drilling Inc. Hydraulic multi-displacement hoisting cylinder system

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JPS53151764U (de) * 1977-04-30 1978-11-29
DE3416463A1 (de) * 1984-05-04 1985-11-07 Peter 7117 Bretzfeld Herrmann Mehrhub-stellzylinder
DE3436679A1 (de) * 1984-10-05 1986-04-10 Franz 8922 Peiting Henke Hydropneumatische antriebsvorrichtung
DE3816092C2 (de) * 1987-05-28 1996-12-05 Noell Serv & Maschtechn Gmbh Hydraulischer Hubzylinder
US5249502A (en) * 1992-01-13 1993-10-05 Mijo Radocaj Double action, dual speed and force hydraulic actuators
DE4209649C2 (de) * 1992-03-25 1998-12-24 Schloemann Siemag Ag Mehrstufiger hydraulischer Druck-Zylinder
US5613418A (en) * 1992-03-25 1997-03-25 Man Gutehoffnungshutte Aktiengesellschaft Multiple-stage hydraulic cylinder
TWI354069B (en) * 2008-05-06 2011-12-11 Jih I Ou Multi-functional air circulation system
FR2948095B1 (fr) * 2009-07-15 2012-01-20 Messier Dowty Sa Verin double fonction direction et relevage pour train d'aterrissage avant

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US2510314A (en) * 1943-12-17 1950-06-06 Deere Mfg Co Fluid pressure motor
US2397106A (en) * 1945-03-09 1946-03-26 Haller John Fluid transmission system for machine tools
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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033250A (en) * 1975-06-18 1977-07-05 The Babcock & Wilcox Company Pneumatic buffering system
US4323002A (en) * 1977-08-10 1982-04-06 Fletcher Sutcliffe Wild Limited Hydraulic equipment
US4368662A (en) * 1979-03-09 1983-01-18 Industrie-Werke Karlsruhe Augsburg Aktiengesellschaft Zweignieder-Lassung Keller & Knappich Cylinder arrangement for friction-welding machine
US4370982A (en) * 1980-09-10 1983-02-01 Medrad, Inc. Method and apparatus for injecting and for controlling the pressure of fluid being injected into a catheter
US4800723A (en) * 1984-06-13 1989-01-31 Centre National De La Recherche Scientifique Electrically-driven opposed flexible bellows pump and position-controlled opposed flexible bellows jack system
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US5909921A (en) * 1997-04-11 1999-06-08 Nesbeth; Roleto E. Lift device and system for a pick-up truck cargo cover
US20050029690A1 (en) * 2003-08-08 2005-02-10 George Burlow Method and apparatus for manufacturing compressed earthen blocks
WO2005038161A2 (en) * 2003-08-08 2005-04-28 Dynabloc Technologies (Pty) Ltd. Method and apparatus for manufacturing compressed earthen blocks
WO2005038161A3 (en) * 2003-08-08 2006-03-23 Dynabloc Technologies Pty Ltd Method and apparatus for manufacturing compressed earthen blocks
US20130119196A1 (en) * 2010-11-22 2013-05-16 The Boeing Company Hydraulic Strut Assembly for Semi-Levered Landing Gear
US10246951B2 (en) 2014-02-06 2019-04-02 Ensign Drilling Inc. Hydraulic multi-displacement hoisting cylinder system
US10519725B2 (en) 2014-02-06 2019-12-31 Ensign Drilling Inc. Hydraulic multi-displacement hoisting cylinder system
CN105889167A (zh) * 2014-12-12 2016-08-24 唐维 自锁式多级液压油缸
CN105782164A (zh) * 2016-05-26 2016-07-20 中国人民解放军国防科学技术大学 多腔体液压缸及其控制系统和控制方法

Also Published As

Publication number Publication date
JPS49100489A (de) 1974-09-24
DE2321820A1 (de) 1974-08-08
JPS5321073B2 (de) 1978-06-30
SE398914B (sv) 1978-01-23

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