US3844534A - Lightweight hydraulic jack - Google Patents

Lightweight hydraulic jack Download PDF

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Publication number
US3844534A
US3844534A US00366582A US36658273A US3844534A US 3844534 A US3844534 A US 3844534A US 00366582 A US00366582 A US 00366582A US 36658273 A US36658273 A US 36658273A US 3844534 A US3844534 A US 3844534A
Authority
US
United States
Prior art keywords
sleeve
housing
reservoir
steel
hydraulic jack
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US00366582A
Other languages
English (en)
Inventor
D Sessody
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Enerpac Tool Group Corp
Original Assignee
Applied Power Inc
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 Applied Power Inc filed Critical Applied Power Inc
Priority to US00366582A priority Critical patent/US3844534A/en
Priority to GB2131874A priority patent/GB1412394A/en
Priority to AU69033/74A priority patent/AU489175B2/en
Priority to CA200,299A priority patent/CA975745A/en
Priority to NL7406726A priority patent/NL7406726A/xx
Priority to IT51194/74A priority patent/IT1013230B/it
Priority to IT51222/74A priority patent/IT1013250B/it
Priority to BR4507/74A priority patent/BR7404507D0/pt
Priority to FR7419030A priority patent/FR2231872B3/fr
Priority to JP49062773A priority patent/JPS5021452A/ja
Priority to DE7419256U priority patent/DE7419256U/de
Priority to DE19742426939 priority patent/DE2426939A1/de
Priority to ES426968A priority patent/ES426968A1/es
Application granted granted Critical
Publication of US3844534A publication Critical patent/US3844534A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B66F3/26—Adaptations or arrangements of pistons
    • 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
    • B66F3/42—Constructional features with self-contained pumps, e.g. actuated by hand

Definitions

  • ABSTRACT [52] US. Cl. 254/93 H A lightweight hydraulic jack having a gray iron sleeve [51] Int. CL... 866i 3/24 embedded within a cast aluminum housing, a steel [58] Field of Search 254/93 H, 93 R; 60/477; plunger mounted for reciprocal motion within the 92/169, 171 sleeve, the sleeve being provided with an annular shoulder and a number of longitudinal ribs to prevent [56] References Cited movement of the sleeve with respect to the housing. 1 UNITED STATES PATENTS Hydraulic fluid is pumped from a reservoir in the 2,352,390 6/1944 Kirkland...
  • 254/93 H housing the sleeve and from the i back 2 527 428 10/1950 Kemerer... 254/93 11 the reserm" through Steel Valve Seats wh'ch are 2173 27 16 2/1956 Pearne 254/93 H tioned at the Control Points in a fluid Passage network 3,047,269 7/1962 Renshaw.. 254/93 H ll! the housing. 3,439,586 4/1969 Holtan 92/169 3,743,448 7/1973 Dorn 92/171 4 Clam, 15 D'awmg I lllllll 112 ⁇ f 10 12 i 1 12 2s 16 f i 88 15 J 62 64 22 114 7 624 38 100,
  • Hydraulic jacks of the type contemplated generally operate at high pressure up to 10,000 psi. It has been the general practice to manufacture these jacks from heavy materials such as iron and steel which are capable of withstanding high hydraulic loads at these pressures. Therefore, as the rating 'of the jack increased the weight of the jack also increased.
  • the present invention provides a lightweight hydraulic jack which is capable of handling heavy loads without any substantial increase in weight at higher rated loads. This has been accomplished by casting the housing from aluminum and embedding an iron sleeve in the casting as an integral part of the base of the jack. The sleeve is prevented from moving in the housing by a shoulder on the bottom and a number of longitudinally extending ribs along the sides to allow for machining after casting.
  • the life of the jack has been extended by using steel parts in all instances where there is flow of hydraulic fluid under high pressure.
  • the strength of the bond between the sleeve-and the casting is protected by an O- ring seal located in a space provided between the sleeve and the casting. 7
  • FIG. 1 is a perspective view of the jack of this invention taken from the upper left hand side;
  • FIG. 2 is a perspective view of the jack of this invention taken from the upper right hand side;
  • FIG. 3 is a perspective view of the back of the jack
  • FIG. 4 is a front view in elevation of the jack; 5 is a left side view in elevation of the jack; 6 is a rear end view of the jack; 7 is a top plan view of the jack; I; is a right side view in elevation of the jack; FIG. 9 is a bottom view of the jack; FIG. 10 is a top view of the jack partly broken away to show the hydraulic flow passages in the jack housing;
  • FIG. FIG. FIG. 1 A first figure.
  • FIG. is a cross-sectional view taken on line 15-15 of FIG. 11 showing the retaining ribs of the sleeve.
  • the hydraulic jack 10 of the present invention generally includes a lightweight aluminum base 12 having a steel plunger and iron sleeve assembly 14 and a fluid reservoir 16. Fluid is pumped from the reservoir 16 to the piston and cylinder assembly 14 by means of a pump assembly 18 and is returned from the piston and cylinder assembly 14 to the reservoir 16 by means of a fluid release valve assembly 20.
  • the hydraulic jack is actuated by closing the valve assembly 20, pumping fluid through one-way check valves 22 and 24 in the piston and cylinder assembly 14. Pressure is released in the piston and cylinder assembly by opening the valve assembly 20 to allow fluid to flow back to the reservoir 16.
  • the housing or base 12 is cast from aluminum and includes a closed end bore or recess 28 and an open end bore 30 having a reduced diameter section 31.
  • the closed end bore 28 defines the reservoir 16 and is connected to the open end bore 30 by means of a fluid passage network 15.
  • the fluid passage network 15 is connected to first and second closed end bores 32 and 34 which accommodate the pump assembly 18 and the release valve assembly 20.
  • the fluid bore 32 includes a threaded reduced diameter section 36 at its inner end and a threaded section 38 at its outer end.
  • the second bore 34 includes a reduced diameter'section 40 at its inner end having a threaded section 42 at the entry to the reduced diameter section 40 and a threaded section 44 at the inlet to the second bore 34.
  • the fluid passage network 15 includes a threaded bore 54 connecting the reservoir 16 to the bore 32; a cross passage 56 connecting the reduced diameter section 36 to the reduced diameter section 42 of the closed end bore 34 and a return port 35 connecting the bore 34 to the reservoir 16.
  • An enlarged section 58 is provided at the open end of passage 56 and includes threaded section 59.
  • the passage 56 is closed at its outer end by means of a threaded plug 60.
  • the enlarged section 58 is connected to the bore 30 by a port
  • the flow of fluid from the reservoir 16 to the bore 32 is limited to one-way flow by means of a check valve assembly 22.
  • the flow of fluid from the passage 32 to the passage 56 is controlled by means of a check valve assembly 24.
  • the check valve assemblies 22 and 24 both include a steel valve seat 62 having a small diameter port 64 which terminates in an enlarged counterbore or recess 66.
  • the ports 64 are closed by means of a steel ball 68 provided in counterbore 66.
  • the ball 68 is biased by means of a spring 70 into engagement with the inner end of its small diameter port 64.
  • the spring 70 is retained in the counterbore 66 by means of a spring retainer ring 71.
  • the valve seats 62 are sealed by means of gaskets 63. I
  • the Pump Assembly 18 includes a sleeve 72 having a threaded section 74 and is threadedly mounted in the threaded section 38 at the end of bore 32.
  • the sleeve 72 is sealed within the bore 32 by means of. an O-ring seal 76 provided in a groove 78 in the outer surface of the sleeve 72.
  • the sleeve 72 includes an axially extending bore 80 and is formed from a wear resistant material such as steel.
  • Fluid is pumped into and out of the bore 32 by means of a plunger 82 mounted for reciprocal movement in the bore 80.
  • the plunger 82 is sealed therein by means of an O-ring seal 84 provided in an annular groove 86 in the sleeve 72.
  • the plunger 82 is reciprocated within the bore 80 by means of a beam 88 pivotally mounted on a beam pin 90 in the base 12.
  • the beam 88 includes a clevis 96 which is connected to a clevis 92 on the end of the plunger 82 by means of a pin 95.
  • the pin 95 extends through a groove 94 in the clevis 92 and openings 97 in the clevis 96.
  • the beam 88 is rotated about the pin 90 by means of a handle 98 having one end seated within an opening 100 in the beam 88.
  • the flow of fluid from the bore 30 to the reservoir 16 is controlled by means of the release valve assembly positioned within the closed end bore 34.
  • the assembly 20 includes a steel valve seat 26 which is threadedly positioned within the threaded section 42 in the small diameter bore 34.
  • the valve seat 26 includes a small diameter opening 102.
  • the flow of fluid through the opening 102 is controlled by means of a valve stem 104 which is positioned within a sleeve 106 provided in-the threaded section 44 in the bore 34.
  • the valve stem 104 includes a valve member 108 at the inner end which is positioned to engage the end of the small diameter opening 102 in the valve seat 26.
  • the valve stem 104 is sealed by means of an O-ring seal 110.
  • the plunger and sleeve assembly 14 includes a sleeve 112 and a plunger 114 having a piston head 116 positioned for reciprocal movement within the sleeve 112.
  • the piston head 116 is sealed within the sleeve by means of an O-ring seal 118 provided in an annular groove 120 in the outer periphery of piston head 116.
  • the lower end of the bore 30 is closed by means of a steel plug 122.
  • the plunger 114 is prevented from moving out of the sleeve 112 by means of a stop ring 124 mounted at the open end of the bore 30.
  • a saddle 126 can be provided at the outer end of the plunger 114, if required.
  • the sleeve 112 is formed of cast iron such as gray iron and is embedded and bonded in the aluminum casting forming the base 12 at the time that the base is cast. The lower end of the sleeve 112 is spaced from the reduced diameter section 31 leaving a gap 125. The sleeve 112 is retained or prevented from moving axially within the bore 30 by means of a shoulder or flange 128 provided at the lower end of the sleeve 112. Although a cast iron sleeve is shown and described, the sleeve could also be machined from an iron casting.
  • the sleeve 112 must be prevented from rotating in the casting 12 during machining or trimming of the bore in the sleeve 112. This is prevented by means of a number of ribs 132 provided on the outer surface of the sleeve.
  • the rib 132 is embedded in the aluminum base during casting.
  • Fluid under pressure is prevented from flowing into the gap 125 by means of an O-ring seal 130.
  • the seal 130 prevents the pressurized hydraulic fluid from reaching the bond between the sleeve and the casting.
  • Means are provided for pumping fluid from the reservoir 16 in any position of the jack 10.
  • Such means is in the form of a rubber bladder positioned in the open end of reservoir 28.
  • the bladder 140 is retained therein by means of a cover 142.
  • Air is vented from the reservoir by means of a vent plug 144 threadedly mounted in threaded opening 146.
  • a port 148 and cross bore 140 are provided in the plug to allow for the venting of air without removing the plug.
  • each of the parts of the jack which is subject to wear or galling is made of a material which is resistant to such action.
  • the plunger and sleeve assembly includes a sleeve 112 made of grey iron and a plunger 114 made of steel.
  • the fluid control points in the fluid passage network are controlled by check valve assemblies 22 and 24 and relief valve assembly 20.
  • Each of the check valve assemblies 22 and 24 includes a steel valve seat 62 and the release valve assembly 20 includes a steel valve seat 26.
  • the iron sleeve is provided with a shoulder and a number of ribs to securely lock the sleeve in the housing.
  • the sleeve can then be machined or trimmed.
  • the bond between the sleeve and housing has been protected by an O-ring seal.
  • a hydraulic jack comprising a lightweight cast aluminum housing having a hydraulic liquid reservoir
  • said sleeve including a shoulder on the outer periphery of the inner end of said sleeve for preventing axial movement of said sleeve in said housing, sealing means located between the inner end of said sleeve and said housing whereby hydraulic fluid under pressure in said sleeve is prevented from flowing between said sleeve and housing and a stop ring threadably engaged in said housing and abutting against the outer end of said sleeve.

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)
  • Reciprocating Pumps (AREA)
US00366582A 1973-06-04 1973-06-04 Lightweight hydraulic jack Expired - Lifetime US3844534A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US00366582A US3844534A (en) 1973-06-04 1973-06-04 Lightweight hydraulic jack
GB2131874A GB1412394A (en) 1973-06-04 1974-05-14 Lightweight hydraulic jack
AU69033/74A AU489175B2 (en) 1973-06-04 1974-05-16 Lightweight hydraulic jack
CA200,299A CA975745A (en) 1973-06-04 1974-05-17 Lightweight hydraulic jack
NL7406726A NL7406726A (xx) 1973-06-04 1974-05-20
IT51194/74A IT1013230B (it) 1973-06-04 1974-05-24 Perfezionamento nei martinetti idraulici macchina di stampaggio ad iniezione
IT51222/74A IT1013250B (it) 1973-06-04 1974-05-27 Perfezionamento nei martinetti idraulici
BR4507/74A BR7404507D0 (pt) 1973-06-04 1974-05-31 Macaco hidraulico
FR7419030A FR2231872B3 (xx) 1973-06-04 1974-05-31
JP49062773A JPS5021452A (xx) 1973-06-04 1974-06-03
DE7419256U DE7419256U (de) 1973-06-04 1974-06-04 Hydraulischer heber
DE19742426939 DE2426939A1 (de) 1973-06-04 1974-06-04 Hydraulischer heber
ES426968A ES426968A1 (es) 1973-06-04 1974-06-04 Gato hidraulico ligero.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00366582A US3844534A (en) 1973-06-04 1973-06-04 Lightweight hydraulic jack

Publications (1)

Publication Number Publication Date
US3844534A true US3844534A (en) 1974-10-29

Family

ID=23443618

Family Applications (1)

Application Number Title Priority Date Filing Date
US00366582A Expired - Lifetime US3844534A (en) 1973-06-04 1973-06-04 Lightweight hydraulic jack

Country Status (10)

Country Link
US (1) US3844534A (xx)
JP (1) JPS5021452A (xx)
BR (1) BR7404507D0 (xx)
CA (1) CA975745A (xx)
DE (2) DE2426939A1 (xx)
ES (1) ES426968A1 (xx)
FR (1) FR2231872B3 (xx)
GB (1) GB1412394A (xx)
IT (2) IT1013230B (xx)
NL (1) NL7406726A (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131403A (en) * 1975-08-08 1978-12-26 Buehler Ltd. Mounting press
US5465576A (en) * 1994-01-24 1995-11-14 Applied Power Inc. Vented hydraulic fluid reservoir
WO2002083545A1 (en) * 2001-04-13 2002-10-24 Norco Industries, Inc. Portable lifting jack
US20040129926A1 (en) * 2001-04-13 2004-07-08 Kun-Shan Hsu Portable lifting jack
US9022356B2 (en) 2012-08-30 2015-05-05 Norco Industries, Inc. Removable saddle and extension for floor jack

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5823867B2 (ja) * 1977-08-30 1983-05-18 株式会社柏化学工業 グアニジン塩類の製造法
JPS5915694U (ja) * 1982-07-16 1984-01-30 カヤバ工業株式会社 油圧式携行ジヤツキ
US4671746A (en) * 1984-06-25 1987-06-09 Applied Power Inc. Base component for a fluid transfer device and method of making the component
DE3603109A1 (de) * 1986-02-01 1987-08-06 Dischler Helmut Hydraulische handpumpe zum betaetigen von kabelschuhpressen und anderen hydraulischen werkzeugen
DE8815110U1 (de) * 1988-12-03 1989-01-26 Emil Weber Fabrik für Ölhydraulik GmbH & Co, 7129 Güglingen Hydraulischer Heber
FR2649387B1 (fr) * 1989-07-07 1991-11-22 Victory Cric hydraulique perfectionne pour le levage et la manutention de charges lourdes de plusieurs tonnes

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB126701A (en) * 1917-02-16 1919-05-22 Peter Brotherhood Ltd An Improved Cylinder Construction for Internal Combustion Engines.
US2352390A (en) * 1943-05-13 1944-06-27 Everett R Kirkland Hydraulic jack
US2527428A (en) * 1947-03-25 1950-10-24 Don C Kemerer Hydraulic jack
US2734716A (en) * 1956-02-14 pearne
US3047269A (en) * 1960-08-30 1962-07-31 Modern Hydraulics Inc Hydraulic jack
US3439586A (en) * 1966-01-10 1969-04-22 Maurice O Holtan Iron cylinder liners
US3743448A (en) * 1971-08-26 1973-07-03 Superior Mfg Co Pump base assembly
US3757523A (en) * 1969-02-08 1973-09-11 Webley & Scott Ltd Hydraulic jacks

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734716A (en) * 1956-02-14 pearne
GB126701A (en) * 1917-02-16 1919-05-22 Peter Brotherhood Ltd An Improved Cylinder Construction for Internal Combustion Engines.
US2352390A (en) * 1943-05-13 1944-06-27 Everett R Kirkland Hydraulic jack
US2527428A (en) * 1947-03-25 1950-10-24 Don C Kemerer Hydraulic jack
US3047269A (en) * 1960-08-30 1962-07-31 Modern Hydraulics Inc Hydraulic jack
US3439586A (en) * 1966-01-10 1969-04-22 Maurice O Holtan Iron cylinder liners
US3757523A (en) * 1969-02-08 1973-09-11 Webley & Scott Ltd Hydraulic jacks
US3743448A (en) * 1971-08-26 1973-07-03 Superior Mfg Co Pump base assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131403A (en) * 1975-08-08 1978-12-26 Buehler Ltd. Mounting press
US5465576A (en) * 1994-01-24 1995-11-14 Applied Power Inc. Vented hydraulic fluid reservoir
WO2002083545A1 (en) * 2001-04-13 2002-10-24 Norco Industries, Inc. Portable lifting jack
US20040129926A1 (en) * 2001-04-13 2004-07-08 Kun-Shan Hsu Portable lifting jack
US7036796B2 (en) * 2001-04-13 2006-05-02 Norco Industries, Inc. Portable lifting jack
US9022356B2 (en) 2012-08-30 2015-05-05 Norco Industries, Inc. Removable saddle and extension for floor jack

Also Published As

Publication number Publication date
NL7406726A (xx) 1974-12-06
DE7419256U (de) 1976-09-02
BR7404507D0 (pt) 1975-01-07
FR2231872B3 (xx) 1977-04-08
CA975745A (en) 1975-10-07
AU6903374A (en) 1975-11-20
JPS5021452A (xx) 1975-03-07
DE2426939A1 (de) 1974-12-19
IT1013230B (it) 1977-03-30
IT1013250B (it) 1977-03-30
ES426968A1 (es) 1976-09-01
FR2231872A1 (xx) 1974-12-27
GB1412394A (en) 1975-11-05

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