US3817152A - Hydraulic jack - Google Patents

Hydraulic jack Download PDF

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Publication number
US3817152A
US3817152A US00234087A US23408772A US3817152A US 3817152 A US3817152 A US 3817152A US 00234087 A US00234087 A US 00234087A US 23408772 A US23408772 A US 23408772A US 3817152 A US3817152 A US 3817152A
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United States
Prior art keywords
pressure
fluid
piston
space
chambers
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Expired - Lifetime
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US00234087A
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English (en)
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M Viron
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/67—Mould opening, closing or clamping devices hydraulic
    • B29C45/6764—Mould opening, closing or clamping devices hydraulic using hydraulically connectable chambers of the clamping cylinder during the mould opening and closing movement
    • 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
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston

Definitions

  • ABSTRACT Fluid pressure system comprises a piston which is slidably mounted in a cylinder and divides said cylinder Mar. 18, I971 France 7
  • pistons be used having a smaller diameter than that of the cylinder barrel in which they move and which, at the end of the compression, fit within a shoulder in one of the end walls of the said cylinder barrel so as to be capable of applying, at the end of the stroke of said piston, increased power to the hydraulic jack rod fixed to this piston, with the major portion of the stroke of the piston being obtained at low power, and with the two compartments on opposite sides of this piston within said cylinder in communication with each other.
  • the jack according to this invention also makes it possible to reduce the force to be applied during the major portion of piston travel of the said jack, by bringing the two compartments of the cylinder barrel coopcrating with the piston and located on opposite sides of this piston, into temporary communication outside the said cylinder, through a connection which can be ter minated at an opportune moment when it is found necessary to increase the force applied to the jack.
  • this jack is arranged to permit replacement of said temporary connection by a connection between one of the said compartments and the pressurized fluid feed pump of the said jack.
  • this additional pressure must be supplied for the same position of the said jack during its advance and reverse strokes.
  • this connection is made automatically as soon as the piston, which has been actuated by the said jack, encounters resistance in one direction or another and, for this reason, comes to a stop.
  • This first embodiment utilizes a single two-position distributor making it possible to reverse the jack operating direction and, according to the case, the system is equipped with one or two calibrated springs respectively making it possible to make said connection at any point during the advance of the jack and, possibly, at any point on its reverse travel.
  • this automatic alternative has the disadvantage of not making it possible to provide a safety system and is only advantageously applicable in the case of injection molds where it is important to increase the force applied on the jack only after having made sure that the mold is previously closed so as to avoid possible damage to a tool that could have accidentally remained between the two parts of such molds and thus prevents their closing.
  • said con nection can be controlled manually, for example by means of two electro-magnets actuating a second three-position distributor, so as to bring it into one or the other of two end positions making it possible to apply additional force on the piston of the said jack either in the direction of its advance or, on the contrary, to reverse its direction.
  • a safety contact could be advantageously installed on the power supply section common to these two electro-magrets.
  • FIG. l is a diagramatic longitudinal diametral sectional view of a first automatic jack arrangement according to the invention, not including a safety contact, and adapted to be used:
  • FIG. 2 is a diagramatic longitudinal diametral sectional view of an automatic jack in accordance with the invention that can be easily adapted:
  • FIG. ll shows that, in the position illustrated on the drawing, the piston rod 3 of a molding press is actuated by pressurized fluid supplied by a pump 4 compressing fluid located in a tank 5.
  • This pressurized fluid is supplied through two pipes 6 and '7 coupled together by a distributor 8,
  • Piston 110 having main surfaces 10a and lltlb moves within a cylinder 112 that has been smoothly finished inside and fluid-tightness is assured between the cylinder and piston by the sealing ring l3.
  • the fluid arriving through pipe 22 can then enter compartment 15, thereby increasing the power applied to the jack and making it possible for rod 3 to advance a small additional distance.
  • this piston 20 compresses the fluid located in channel 17 thereby lifting a poppet valve 23 against the resistance of a spring 24 so that the excess fluid returns to tank 5 through exhaust pipe 25.
  • pump 4 is connected to pipe 27 and space 26, which provokes the return of piston 10 by exerting pressure against the surface 10d of piston 3b fixed to the hollow rod 3a. Sealing contact between this piston and the jack barrel, on the one hand and the pipe 29 fixed to this jack barrel, on the other hand, is assured by two sealing rings 30 and 31.
  • a pipe 35, a piston 36 and a spring 37 are shown in broken lines and can be optionally installed when the return stroke also requires provision for supplemental power at a certain point when the pressure of the fluid introduced into space 26 by pipe 27 is no longer suffrcient to overcome the resistance to the reverse movement of the said jack.
  • the disadvantage of this arrangement is that it does not ensure safety, since if the pressure applied either in space 9 or in concentric space 26 becomes insufficient to actuate piston Mb, one of the two pistons 20 or 36 is actuated, which could be disadvantageous in certain cases.
  • FIG. 2 the same distributor 8 is shown, which can be reversed by actuating it in the direction of the arrow 2%, as well as pipes 6 and 7, exhaust pipes 25, and various sealing rings, as well as valve 23, its spring 24 and compartments I4 and 15.
  • a second three-position distributor 38 is used which is connected to pump 4 by ducts 39 and 39a and which is connected to the drainage pipe 25 by a duct 40.
  • the electro-magnet 44 is energized in position ll of distributor 8, with its electrical circuit being completed through ring 49.
  • electro-magnet 43 is energized through ring 49.
  • the respective positions of two half rings 50 and 51 are longitudinally adjustable independently on rod 3 in such a manner that it is possible to select any two different positions of piston lid to supply electro-magnet 44 during jaclr advance in the direction of arrow 1 l and electro-magnet d3 during reverse of the rod of the said jack.
  • distributor 38 it is also possible to replace distributor 38 with a distributor having only two positions and to provide, for example, only a single electro-magnet 44- designed simply to procure a power increase during advance of piston 11h.
  • Fluid pressure system comprising a piston member (110) which is slidably mounted in a cylinder (i2) and divides said cylinder into two variable volume chambers M, 115), said chambers being connected through a bypass (i7), and said piston member having two main surfaces (10a, 10b), having substantially identical areas each exposed to the pressure in one of said variable-volume chambers, and a third surface (We) exposed to the pressure in a first space (9) other than either of said chambers, and means (6, 7, 8)for actuating said piston member, said actuating means comprising means for connecting said space to a source of pressure fluid (4) thus applying pressure to said third surface (100) to advance said piston member in one direction while driving fluid from one of said chambers (14) to the other (l5) through said by-pass until the advance of said piston produces a predetermined effect, and means (22, 2h, 23) responsive to the attainment of said predetermined effect for automatically increasing the pressure on said piston member by connecting said other chamber to a source of fluid under pressure, closing said bypass,
  • a fluid pressure system as claimed in claim 6 comprising electrical means for actuating said second distributor and responsive to the position of said rod.
  • Fluid pressure system as claimed in claim 1 in which said piston member is connected to a rod which actuates apparatus offering a varying resistance to the movement of said piston.
  • Fluid pressure system as claimed in claim 5 in which pressure increasing means is responsive to the pressure in said first space.
  • Fluid pressure system as claimed in claim 1 in which said means for connecting one of said chambers to a source of fluid pressure and for closing said by-pass is a single spring-loaded valve responsive to the pressure in said space, and movable between a first position in which it closes a connection between said other chamber and said pressure source and a second position in which it closes said by-pass but opens said connection.
  • a fluid pressure system as claimed in claim l in which said piston member has a fourth surface facing in a direction opposite to that faced by said third surface and subject to the pressure in a second space outside said cylinder, and said actuating means comprises reversible pressure fluid distributor means movable between a first position in which it is connected upon operation of said pressure increasing means to simulta neously supply pressure fluid to one of said spaces and one of said variable chambers while connecting the other of said spaces and the other of said variable chambers to exhaust, and a second position in which pressure fluid is supplied to said other space and variable chamber while said one space and variable chambar are connected to exhaust.
  • a fluid pressure system as claimed in claim 8 in which said pressure increasing means comprises two spring-loaded valves in said by-pass, one of which is responsive to the pressure in each of said spaces, and each of which is movable between a first position in which it closes a connection between a different one of said chambers and said pressure source and a second position in which it closes said by-pass but opens said connection.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Press Drives And Press Lines (AREA)
  • Reciprocating Pumps (AREA)
US00234087A 1971-03-18 1972-03-13 Hydraulic jack Expired - Lifetime US3817152A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7109525A FR2129879B1 (enrdf_load_stackoverflow) 1971-03-18 1971-03-18

Publications (1)

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US3817152A true US3817152A (en) 1974-06-18

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ID=9073745

Family Applications (1)

Application Number Title Priority Date Filing Date
US00234087A Expired - Lifetime US3817152A (en) 1971-03-18 1972-03-13 Hydraulic jack

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US (1) US3817152A (enrdf_load_stackoverflow)
DE (1) DE2211288A1 (enrdf_load_stackoverflow)
FR (1) FR2129879B1 (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258609A (en) * 1977-10-11 1981-03-31 Conway John P Dual speed hydraulic piston assembly
DE3048814A1 (de) * 1979-12-27 1981-09-24 Hitachi, Ltd., Tokyo Hydraulische betaetigungseinrichtung
US4348943A (en) * 1980-04-28 1982-09-14 Hydroacoustics Inc. Hydraulic press apparatus
US4433543A (en) 1980-04-23 1984-02-28 Lucas Industries Limited Power-operated boosters
US4557181A (en) * 1983-12-13 1985-12-10 American Standard Inc. Brake cylinder/air reservoir device
US4598629A (en) * 1984-06-27 1986-07-08 Bendiberica, S.A. Compact assisted steering mechanism
US4642989A (en) * 1983-05-28 1987-02-17 Itt Industries, Inc. Hydraulic power booster
US5209154A (en) * 1990-11-08 1993-05-11 Allied-Signal Inc. Dual area brake actuation piston mechanism
US5784943A (en) * 1996-03-15 1998-07-28 Tamrock Oy Arrangement in a hydraulic cylinder
CN103671349A (zh) * 2012-08-31 2014-03-26 苏州立注机械有限公司 一种合模油缸上盖
US10688646B2 (en) 2015-02-27 2020-06-23 Gustav Klauke Gmbh Method for operating a hydraulically operated hand-held device and hydraulically operated hand-held device
US11612990B2 (en) 2016-06-29 2023-03-28 Gustav Klauke Gmbh Method for operating a hydraulically operated handheld device, and hydraulically operated handheld device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2562611A1 (fr) * 1984-04-09 1985-10-11 Alberti Rosette Procede d'alimentation des verins hydrauliques et verins hydrauliques mettant en oeuvre le procede
FR2657039B1 (fr) * 1990-01-13 1996-01-05 Wagner Paul Heinz Visseuse motorisee entrainee par la pression.
DE4104856A1 (de) * 1991-02-16 1991-10-31 Krupp Maschinentechnik Antriebseinrichtung fuer ein abbruchwerkzeug
AT411034B (de) * 2001-02-14 2003-09-25 Hoerbiger Hydraulik Hydraulische spannvorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US487132A (en) * 1892-11-29 Engine
US2502547A (en) * 1948-05-11 1950-04-04 Denison Eng Co Hydraulic apparatus
US3476019A (en) * 1967-09-08 1969-11-04 Berg Mfg & Sales Co Air-assisted emergency spring brake assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB654191A (en) * 1949-07-12 1951-06-13 Laycock Engineering Company Lt Improvements in or relating to hydraulic jacks, presses and like hydraulic apparatus
GB843328A (en) * 1957-08-26 1960-08-04 Nat Automatic Tool Company Inc Improvements in and relating to control devices for hydraulic rams
CH485948A (de) * 1966-12-14 1970-02-15 Frieseke & Hoepfner Gmbh Schubkolbentrieb mit Eilhub und Krafthub

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US487132A (en) * 1892-11-29 Engine
US2502547A (en) * 1948-05-11 1950-04-04 Denison Eng Co Hydraulic apparatus
US3476019A (en) * 1967-09-08 1969-11-04 Berg Mfg & Sales Co Air-assisted emergency spring brake assembly

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258609A (en) * 1977-10-11 1981-03-31 Conway John P Dual speed hydraulic piston assembly
DE3048814A1 (de) * 1979-12-27 1981-09-24 Hitachi, Ltd., Tokyo Hydraulische betaetigungseinrichtung
US4404892A (en) * 1979-12-27 1983-09-20 Hitachi, Ltd. Hydraulic operating apparatus
US4433543A (en) 1980-04-23 1984-02-28 Lucas Industries Limited Power-operated boosters
US4348943A (en) * 1980-04-28 1982-09-14 Hydroacoustics Inc. Hydraulic press apparatus
US4642989A (en) * 1983-05-28 1987-02-17 Itt Industries, Inc. Hydraulic power booster
AU571051B2 (en) * 1983-12-13 1988-03-31 American Standard, Inc. Brake cylinder-air reservoir
US4557181A (en) * 1983-12-13 1985-12-10 American Standard Inc. Brake cylinder/air reservoir device
US4598629A (en) * 1984-06-27 1986-07-08 Bendiberica, S.A. Compact assisted steering mechanism
US5209154A (en) * 1990-11-08 1993-05-11 Allied-Signal Inc. Dual area brake actuation piston mechanism
US5784943A (en) * 1996-03-15 1998-07-28 Tamrock Oy Arrangement in a hydraulic cylinder
CN103671349A (zh) * 2012-08-31 2014-03-26 苏州立注机械有限公司 一种合模油缸上盖
US10688646B2 (en) 2015-02-27 2020-06-23 Gustav Klauke Gmbh Method for operating a hydraulically operated hand-held device and hydraulically operated hand-held device
US11612990B2 (en) 2016-06-29 2023-03-28 Gustav Klauke Gmbh Method for operating a hydraulically operated handheld device, and hydraulically operated handheld device

Also Published As

Publication number Publication date
FR2129879B1 (enrdf_load_stackoverflow) 1974-10-11
DE2211288A1 (de) 1972-09-21
FR2129879A1 (enrdf_load_stackoverflow) 1972-11-03

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