FR2305622A1 - Multi-stage telescopic hydraulic jack - has retraction time reduced by pressure chambers between stepped stages - Google Patents

Multi-stage telescopic hydraulic jack - has retraction time reduced by pressure chambers between stepped stages

Info

Publication number
FR2305622A1
FR2305622A1 FR7509570A FR7509570A FR2305622A1 FR 2305622 A1 FR2305622 A1 FR 2305622A1 FR 7509570 A FR7509570 A FR 7509570A FR 7509570 A FR7509570 A FR 7509570A FR 2305622 A1 FR2305622 A1 FR 2305622A1
Authority
FR
France
Prior art keywords
retraction
stages
hydraulic jack
pressure chambers
telescopic hydraulic
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.)
Granted
Application number
FR7509570A
Other languages
French (fr)
Other versions
FR2305622B1 (en
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.)
ALMON ROBERT
Original Assignee
ALMON ROBERT
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 ALMON ROBERT filed Critical ALMON ROBERT
Priority to FR7509570A priority Critical patent/FR2305622A1/en
Priority to ES446101A priority patent/ES446101A1/en
Priority to BE165455A priority patent/BE839906A/en
Publication of FR2305622A1 publication Critical patent/FR2305622A1/en
Application granted granted Critical
Publication of FR2305622B1 publication Critical patent/FR2305622B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubricants (AREA)
  • Actuator (AREA)

Abstract

The multi-stage, telescopic, hydraulic jack for lifting equipment, designed to reduce time during retraction of some stages, has a hydraulic pressure chamber common to all the stages, by which they are extended, and has a pressure chamber between stages, suitably interconnected by supply lines, formed by the space between the inside of one section and the smaller diameter of the section which fits inside it, used to carry out the retraction of that section. At least two chambers controlling retraction are in communication, at least when the last stage is in a position of retraction, to ensure a feed of hydraulic liquid for the retraction of at least two stages.
FR7509570A 1975-03-24 1975-03-24 Multi-stage telescopic hydraulic jack - has retraction time reduced by pressure chambers between stepped stages Granted FR2305622A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR7509570A FR2305622A1 (en) 1975-03-24 1975-03-24 Multi-stage telescopic hydraulic jack - has retraction time reduced by pressure chambers between stepped stages
ES446101A ES446101A1 (en) 1975-03-24 1976-03-16 Improvements in fluid catches, especially a hydraulic fluid. (Machine-translation by Google Translate, not legally binding)
BE165455A BE839906A (en) 1975-03-24 1976-03-23 IMPROVEMENTS FOR FLUID CYLINDERS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7509570A FR2305622A1 (en) 1975-03-24 1975-03-24 Multi-stage telescopic hydraulic jack - has retraction time reduced by pressure chambers between stepped stages

Publications (2)

Publication Number Publication Date
FR2305622A1 true FR2305622A1 (en) 1976-10-22
FR2305622B1 FR2305622B1 (en) 1978-09-22

Family

ID=9153158

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7509570A Granted FR2305622A1 (en) 1975-03-24 1975-03-24 Multi-stage telescopic hydraulic jack - has retraction time reduced by pressure chambers between stepped stages

Country Status (3)

Country Link
BE (1) BE839906A (en)
ES (1) ES446101A1 (en)
FR (1) FR2305622A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2758163A1 (en) * 1996-12-24 1998-07-10 Gerard Lecomte Single acting jack for loaders on agriculture or industrial tractors
FR2759122A1 (en) * 1996-12-24 1998-08-07 Proofunique France Sa Variable speed power actuator mounted on agricultural tractor
CN105545872A (en) * 2016-02-04 2016-05-04 柳州双吉机械有限公司 Double-acting telescopic multi-stage oil cylinder
CN105545871A (en) * 2016-02-04 2016-05-04 柳州双吉机械有限公司 Double-acting telescopic multi-stage oil cylinder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE958718C (en) * 1953-11-11 1957-02-21 Toussaint & Hess Hydr Hebezeug Multi-stage hydraulic telescopic piston with hydraulic retraction
SU177060A1 (en) * 1964-02-19 1965-12-01 П. Б. Лендер, К. Е. Ивановский, М. М. Петров , Г. В. пкин TELESCOPIC HYDRO
GB1026419A (en) * 1963-12-19 1966-04-20 English Drilling Equipment Com Improvements in hydraulic pis ton and cylinder combinations

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE958718C (en) * 1953-11-11 1957-02-21 Toussaint & Hess Hydr Hebezeug Multi-stage hydraulic telescopic piston with hydraulic retraction
GB1026419A (en) * 1963-12-19 1966-04-20 English Drilling Equipment Com Improvements in hydraulic pis ton and cylinder combinations
SU177060A1 (en) * 1964-02-19 1965-12-01 П. Б. Лендер, К. Е. Ивановский, М. М. Петров , Г. В. пкин TELESCOPIC HYDRO

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2758163A1 (en) * 1996-12-24 1998-07-10 Gerard Lecomte Single acting jack for loaders on agriculture or industrial tractors
FR2759122A1 (en) * 1996-12-24 1998-08-07 Proofunique France Sa Variable speed power actuator mounted on agricultural tractor
CN105545872A (en) * 2016-02-04 2016-05-04 柳州双吉机械有限公司 Double-acting telescopic multi-stage oil cylinder
CN105545871A (en) * 2016-02-04 2016-05-04 柳州双吉机械有限公司 Double-acting telescopic multi-stage oil cylinder

Also Published As

Publication number Publication date
ES446101A1 (en) 1977-06-01
BE839906A (en) 1976-07-16
FR2305622B1 (en) 1978-09-22

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Legal Events

Date Code Title Description
ST Notification of lapse