DE3474134D1 - Hydraulic jack with limited travel - Google Patents

Hydraulic jack with limited travel

Info

Publication number
DE3474134D1
DE3474134D1 DE8484114236T DE3474134T DE3474134D1 DE 3474134 D1 DE3474134 D1 DE 3474134D1 DE 8484114236 T DE8484114236 T DE 8484114236T DE 3474134 T DE3474134 T DE 3474134T DE 3474134 D1 DE3474134 D1 DE 3474134D1
Authority
DE
Germany
Prior art keywords
piston
inner cylinder
cylinder
hydraulic jack
piston rod
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
Application number
DE8484114236T
Other languages
German (de)
Inventor
Claude Pestourie
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.)
RASSANT F ETS
Original Assignee
RASSANT F ETS
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 RASSANT F ETS filed Critical RASSANT F ETS
Application granted granted Critical
Publication of DE3474134D1 publication Critical patent/DE3474134D1/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • 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
    • B66F3/32—Constructional features with means for avoiding excessive shocks on completion of movements
    • 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
    • F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

The hydraulic jack has an inner cylinder (2) which houses a piston (4) fitted with a lip seal (5). The piston has a limited axial movement on the extension (17) of the piston rod (6). A flat sealing ring (21) is fitted in an annular groove on the upper face of the piston. A passageway (23,24) connects the upper end of the inner cylinder (2) with the reserve tank (13) formed by the outer cylinder (11). When the piston reaches the top of its stroke, its upper face abuts against the shoulder (27) of the end cover (8). Any further rise in pressure in the cylinder (2) moves the piston rod relative to the piston. Oil in the inner cylinder can then flow through the piston rod clearance (18) over the sealing ring (21) and out through the passage into the outer cylinder thus relieving the pressure in the inner cylinder.
DE8484114236T 1984-11-26 1984-11-26 Hydraulic jack with limited travel Expired DE3474134D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19840114236 EP0182927B1 (en) 1984-11-26 1984-11-26 Hydraulic jack with limited travel

Publications (1)

Publication Number Publication Date
DE3474134D1 true DE3474134D1 (en) 1988-10-27

Family

ID=8192308

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8484114236T Expired DE3474134D1 (en) 1984-11-26 1984-11-26 Hydraulic jack with limited travel

Country Status (2)

Country Link
EP (1) EP0182927B1 (en)
DE (1) DE3474134D1 (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1720434A (en) * 1924-12-05 1929-07-09 Oil Jack Inc Fluid-operated jack
FR998545A (en) * 1945-10-25 1952-01-21 Improvement in hydraulic cylinders
US2520426A (en) * 1947-10-15 1950-08-29 Auto Specialties Mfg Co Hydraulic jack
FR1175430A (en) * 1957-02-05 1959-03-26 Saxby Ets Improvements in hydro-mechanical transmissions
US3311026A (en) * 1965-12-27 1967-03-28 Caterpillar Tractor Co Bypass valve for hydraulic jacks
US3404868A (en) * 1966-06-22 1968-10-08 Walker Mfg Co Hydraulic jack
GB1239648A (en) * 1969-07-04 1971-07-21
US3601011A (en) * 1969-07-22 1971-08-24 Tenneco Inc Diffusion ring for limiting hydraulic ram travel
US4077608A (en) * 1977-01-04 1978-03-07 Auto Specialties Manufacturing Company Hydraulic hand jack
FR2547290B1 (en) * 1983-06-07 1987-04-30 Rassant Sa Ets F HYDRAULIC JACK WITH IMPROVED TRAVEL LIMITER

Also Published As

Publication number Publication date
EP0182927A1 (en) 1986-06-04
EP0182927B1 (en) 1988-09-21

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee