GB811485A - Improvements in pneumatic jacks - Google Patents

Improvements in pneumatic jacks

Info

Publication number
GB811485A
GB811485A GB14091/57A GB1409157A GB811485A GB 811485 A GB811485 A GB 811485A GB 14091/57 A GB14091/57 A GB 14091/57A GB 1409157 A GB1409157 A GB 1409157A GB 811485 A GB811485 A GB 811485A
Authority
GB
United Kingdom
Prior art keywords
pistons
piston
chamber
sleeves
main
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
GB14091/57A
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of GB811485A publication Critical patent/GB811485A/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/121Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
    • F15B11/123Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions by means of actuators with fluid-operated stops
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J10/00Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general
    • F16J10/02Cylinders designed to receive moving pistons or plungers

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Combustion & Propulsion (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

811,485. Pneumatic jacks. REGIE NATIONALE DES USINES RENAULT. May 2, 1957 [May 3, 1956], No. 14091/57. Class 8(2). [Also in Group XXVI] A double acting pneumatic jack which normally assumes a central position and to which it is automatically returned after a working stroke in either direction comprises main pistons 18, 19, Fig. 1, having extension sleeves 22, 23 connected together by a sleeve 25 and secured to the actuating rod 4, and non-connected secondary pistons 20, 21 slidable within liners 14, 14<SP>1</SP> and also having extension sleeves 28, 29 in sliding engagement with sleeves 22, 23 either inside or outside thereof and capable of being displaced by an adjacent main piston ; the outer faces of pistons 18, 19 forming with the cylinder ends chambers 12, 13 having ports 9, 91 normally connected to the exhaust outlets of control valves (not shown) but when connected to a compressed air outlet of one or other of the valves provide the pressure necessary to effect a working stroke 50 whereas the faces of the secondary pistons 20, 21 remote from their sleeves 28, 29 form with the cylinder liners a chamber 43 having a port 42 connected to a constant supply of compressed air which serves to return the appropriate secondary piston and hence the connected main pistons to the dead centre position after the appropriate port 9, 9<SP>1</SP> has been connected to exhaust. In operation and on pressurising say chamber 13, the secondary piston 21 is displaced to the left by piston 19 whilst secondary piston 20 is held stationary by its abutment against a shoulder 30 of liner 14. On connecting chamber 13 to exhaust the constant pressure in chamber 43 acting against the piston 21 returns it and the connected main pistons to the dead centre position. In a modification the actuating rod 57, Fig. 2, connected to the main pistons 54, 55 extends through a slot 58 midway of the cylinder wall and the secondary pistons 64, 65 slide in liners 62, 63 and the sleeves 67, 68 thereof slide within the sleeve connecting the main pistons 54, 55. To effect a working stroke 80 the chamber 76 is pressurised, and the main pistons together with secondary piston 64 is moved to the left, whereas secondary piston 65 is held against a shoulder 81 of liner 63. On connecting chamber 76 to exhaust, the constant pressure in connected chambers 69, 70 returns piston 64 to its former position together with the main pistons 54, 55.
GB14091/57A 1956-05-03 1957-05-02 Improvements in pneumatic jacks Expired GB811485A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR811485X 1956-05-03

Publications (1)

Publication Number Publication Date
GB811485A true GB811485A (en) 1959-04-08

Family

ID=9261017

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14091/57A Expired GB811485A (en) 1956-05-03 1957-05-02 Improvements in pneumatic jacks

Country Status (1)

Country Link
GB (1) GB811485A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4467825A (en) * 1983-01-17 1984-08-28 The Andy Boyd Company Shuttle valve assembly
GB2138505A (en) * 1983-04-23 1984-10-24 Duncan Ross Stewart Fluid-pressure-operated actuators
GB2324840A (en) * 1997-04-10 1998-11-04 Mannesmann Sachs Ag Sealing ring
US6371149B1 (en) * 2000-06-26 2002-04-16 Eaton Corporation Shuttle valve assembly and improved shifting thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4467825A (en) * 1983-01-17 1984-08-28 The Andy Boyd Company Shuttle valve assembly
GB2138505A (en) * 1983-04-23 1984-10-24 Duncan Ross Stewart Fluid-pressure-operated actuators
GB2324840A (en) * 1997-04-10 1998-11-04 Mannesmann Sachs Ag Sealing ring
GB2324840B (en) * 1997-04-10 2001-02-14 Mannesmann Sachs Ag Sealing ring
US6209882B1 (en) 1997-04-10 2001-04-03 Mannesmann Sachs Ag Lip seal for sealing cylindrical surfaces
US6371149B1 (en) * 2000-06-26 2002-04-16 Eaton Corporation Shuttle valve assembly and improved shifting thereof

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