FR2376315A1 - Hydraulic jack with increased force at end of stroke - has secondary piston with wedge on end of piston rod - Google Patents

Hydraulic jack with increased force at end of stroke - has secondary piston with wedge on end of piston rod

Info

Publication number
FR2376315A1
FR2376315A1 FR7639865A FR7639865A FR2376315A1 FR 2376315 A1 FR2376315 A1 FR 2376315A1 FR 7639865 A FR7639865 A FR 7639865A FR 7639865 A FR7639865 A FR 7639865A FR 2376315 A1 FR2376315 A1 FR 2376315A1
Authority
FR
France
Prior art keywords
piston
wedges
stroke
hydraulic jack
wedge
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.)
Withdrawn
Application number
FR7639865A
Other languages
French (fr)
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.)
SOMAP SARL
Original Assignee
SOMAP SARL
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 SOMAP SARL filed Critical SOMAP SARL
Priority to FR7639865A priority Critical patent/FR2376315A1/en
Publication of FR2376315A1 publication Critical patent/FR2376315A1/en
Withdrawn legal-status Critical Current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
    • F15B15/20—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

Landscapes

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

Abstract

A hydraulic jack has a cylinder (1) with a main piston (2) which houses an inner secondary piston (6). The secondary piston has a piston rod with a wedge shaped end (4) which acts against the end surfaces of radially arranged wedges (3). These radial wedges slide in slots (5) in the main piston (2). When the main piston approaches the end of its stroke the wedges are forced radially outwards and their outer ends engage the sloping surface (7) of the cylinder end cap (8). The reaction from the cylinder end cap produces an additional force in the axial direction which is transmitted to the piston through the surfaces of the slots in which the wedges are fitted.
FR7639865A 1976-12-28 1976-12-28 Hydraulic jack with increased force at end of stroke - has secondary piston with wedge on end of piston rod Withdrawn FR2376315A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7639865A FR2376315A1 (en) 1976-12-28 1976-12-28 Hydraulic jack with increased force at end of stroke - has secondary piston with wedge on end of piston rod

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7639865A FR2376315A1 (en) 1976-12-28 1976-12-28 Hydraulic jack with increased force at end of stroke - has secondary piston with wedge on end of piston rod

Publications (1)

Publication Number Publication Date
FR2376315A1 true FR2376315A1 (en) 1978-07-28

Family

ID=9181893

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7639865A Withdrawn FR2376315A1 (en) 1976-12-28 1976-12-28 Hydraulic jack with increased force at end of stroke - has secondary piston with wedge on end of piston rod

Country Status (1)

Country Link
FR (1) FR2376315A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0939233A3 (en) * 1998-02-27 2001-12-05 Stahl, Gabriele Force multiplier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0939233A3 (en) * 1998-02-27 2001-12-05 Stahl, Gabriele Force multiplier

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Legal Events

Date Code Title Description
ST Notification of lapse