GB1387475A - Hydraulic or pneumatic actuators of the cylinder and piston type - Google Patents

Hydraulic or pneumatic actuators of the cylinder and piston type

Info

Publication number
GB1387475A
GB1387475A GB472772A GB472772A GB1387475A GB 1387475 A GB1387475 A GB 1387475A GB 472772 A GB472772 A GB 472772A GB 472772 A GB472772 A GB 472772A GB 1387475 A GB1387475 A GB 1387475A
Authority
GB
United Kingdom
Prior art keywords
rod
pistons
cylinder
pressure
external force
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
GB472772A
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.)
Societe dApplications des Machines Motrices SAMM SA
Original Assignee
Societe dApplications des Machines Motrices SAMM SA
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
Priority to FR7103536A priority Critical patent/FR2124071B1/fr
Application filed by Societe dApplications des Machines Motrices SAMM SA filed Critical Societe dApplications des Machines Motrices SAMM SA
Publication of GB1387475A publication Critical patent/GB1387475A/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
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1409Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons

Abstract

1387475 Fluid operated actuators SOC D'APPLICATIONS DES MACHINES MOTRICES 1 Feb 1972 [3 Feb 1971] 4727/72 Heading F1D An hydraulic or pneumatic actuator comprises an output rod 3 carrying pistons 5a, 5b slidable thereon, the pistons 5a, 5b being reciprocable in a main drive rod 1 having pistons 7a, 7b which are themselves reciprocable in a cylinder 2, and the rod 3 being normally pulled along with the main rod 1 but being displaceable relative to the rod I upon experiencing a predetermined external force. An annular chamber 6 between pistons 5a, 5b is connected via passage 10 in rod 1 to a further annular chamber 8 between pistons 7a, 7b which is in turn connected to a source of pressure via a passage 9 in cylinder 2. Passages 11a, 11b convey fluid into cylinder 2 for reciprocation of main rod 1. The pressure in chamber 6 urges pistons 5a, 5b apart against stop collars 3a, 3b on the rod 3 and against abutments la, 1b formed internally of rod 1. Thus it can be seen that rod 3 will normally follow all movements of rod 1. However, if an external force on rod 3 in either direction exceeds the force separating the pistons 5a, 5b due to the pressure in chamber 6, then a respective piston 5a, 5b will be moved by its associated collar 3a, 3b towards the other piston which will be held against its respective abutment 1a, 1b, Fig.3. The pressure in chamber 6 will remain constant and only when the external force F3 falls below the predetermined value will the original configuration, Fig.1, be restored. Applications of such an actuator are described Figs.4 to 6 (not shown) and an actuator in which the rod 3 is sensitive to an external force only in one direction is also referred to Fig.7 (not shown).
GB472772A 1971-02-03 1972-02-01 Hydraulic or pneumatic actuators of the cylinder and piston type Expired GB1387475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7103536A FR2124071B1 (en) 1971-02-03 1971-02-03

Publications (1)

Publication Number Publication Date
GB1387475A true GB1387475A (en) 1975-03-19

Family

ID=9071300

Family Applications (1)

Application Number Title Priority Date Filing Date
GB472772A Expired GB1387475A (en) 1971-02-03 1972-02-01 Hydraulic or pneumatic actuators of the cylinder and piston type

Country Status (2)

Country Link
FR (1) FR2124071B1 (en)
GB (1) GB1387475A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3809165A1 (en) * 1988-03-18 1989-09-28 Rexroth Mannesmann Gmbh Device for feeding pressure medium to a hydraulic drive
DE4038170A1 (en) * 1990-11-30 1992-06-04 Claas Ohg THREE-POSITION CYLINDER SYSTEM
US7395749B2 (en) 2005-05-12 2008-07-08 Michael R Adams Pneumatic cylinder

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2667550B1 (en) * 1990-10-03 1994-01-28 Hydris ASSEMBLY FOR MOUNTING A LIFT TAILGATE RETRACTABLE PARALLEL TO THE CHASSIS OF A VEHICLE.
FR2667909B1 (en) * 1990-10-03 1993-06-18 Hydris TELESCOPIC CYLINDER.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1199847A (en) * 1968-07-03 1970-07-22 Dewandre Co Ltd C Improvements in or relating to Actuators for Gear Boxes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3809165A1 (en) * 1988-03-18 1989-09-28 Rexroth Mannesmann Gmbh Device for feeding pressure medium to a hydraulic drive
DE4038170A1 (en) * 1990-11-30 1992-06-04 Claas Ohg THREE-POSITION CYLINDER SYSTEM
US7395749B2 (en) 2005-05-12 2008-07-08 Michael R Adams Pneumatic cylinder

Also Published As

Publication number Publication date
FR2124071A1 (en) 1972-09-22
FR2124071B1 (en) 1976-02-06

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years