GB955264A - Improvements in or relating to pneumatic control cylinders - Google Patents

Improvements in or relating to pneumatic control cylinders

Info

Publication number
GB955264A
GB955264A GB4083560A GB4083560A GB955264A GB 955264 A GB955264 A GB 955264A GB 4083560 A GB4083560 A GB 4083560A GB 4083560 A GB4083560 A GB 4083560A GB 955264 A GB955264 A GB 955264A
Authority
GB
United Kingdom
Prior art keywords
piston
cylinder
packings
packing
compressed air
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
GB4083560A
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 GB955264A publication Critical patent/GB955264A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D15/00—Component parts of recorders for measuring arrangements not specially adapted for a specific variable
    • G01D15/14—Optical recording elements; Recording elements using X-or nuclear radiation
    • 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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1433—End caps
    • 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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F15B15/1452—Piston sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/002—Sealings comprising at least two sealings in succession
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
    • F16J15/48—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings influenced by the pressure within the member to be sealed

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Sealing Devices (AREA)

Abstract

955,264. Piston and stuffing-box packings. REGIE NATIONALE DES USINES RENAULT. Nov. 28, 1960 [Nov. 30, 1959], No. 40835/60. Headings F2B and F2T. In a pneumatic cylinder incorporating a double-packing sealing device for the piston and/or the stuffing-box, the two portions of the device are provided with a space between them communicating through a channel with the compressed air supplied to the cylinder and in which, during movement of the piston, the air pressure is allowed to rise to the value of that of the air supply so as to avoid jamming or sticking of the packing lips on the walls of the cylinder and/or on the piston rod. In Fig. 1, the space 3 between lipped packings 13, 14 communicates through an orifice 25 with a cylindrical bore 15 formed in the piston 5 and fitted at its ends with plugs 22, 23 provided with orifices 20, 21. A movable member 16 slidably fitted in the bore 15 is provided with a packing having beads 19 acting as dampers and as obturators for the orifices 20, 21. Alternatively, the member 16 is replaced by a plastic or steel ball. On the upward stroke of the piston, compressed air supplied through an inlet 26 displaces the member 16 to close the orifice 20 and enters the space 3 so that packing 14 becomes pressure balanced and packing 13 is made fluid tight against the cylinder wall. In Fig. 4, the underside of a piston 28 is under constant pressure and the piston rod stuffiing- box comprises packings 33, 34 formed therebetween with a radial orifice 35 connected through a pipe 36 to a line 37 through which compressed air is supplied to the upper chamber 39 of the cylinder. In another embodiment, a double acting cylinder is equipped with a piston similar to that of Fig. 1 but with packings having lugs as described in Specification 955,263, and with a stuffing-box sealing device similar to that of Fig. 4 but in which the pipe 36 incorporates a time-lag valve whereby compressed air is supplied between the packings for a very short time at the start of an operation.
GB4083560A 1959-11-30 1960-11-28 Improvements in or relating to pneumatic control cylinders Expired GB955264A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR811718A FR1250566A (en) 1959-11-30 1959-11-30 Improvements to pneumatic cylinders

Publications (1)

Publication Number Publication Date
GB955264A true GB955264A (en) 1964-04-15

Family

ID=8721975

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4083560A Expired GB955264A (en) 1959-11-30 1960-11-28 Improvements in or relating to pneumatic control cylinders

Country Status (5)

Country Link
BE (1) BE597262A (en)
CH (1) CH392812A (en)
FR (1) FR1250566A (en)
GB (1) GB955264A (en)
LU (1) LU39435A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5398277U (en) * 1977-01-13 1978-08-09
CN101893015A (en) * 2010-07-22 2010-11-24 烟台未来自动装备有限责任公司 Hydraulic cylinder with hydraulic on and off function for dump sanitation truck
CN103089740A (en) * 2012-12-31 2013-05-08 蚌埠液力机械有限公司 Unloading valve and unloading valve oil cylinder

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE424667B (en) * 1975-09-04 1982-08-02 Oiles Industry Co Ltd PLASTIC AIR CYLINDER DEVICE
DE3724370A1 (en) * 1987-07-23 1989-02-02 Stabilus Gmbh INNER PRESSURE INDEPENDENT SEALING SYSTEM WITH GAS PRESSURE SEALED LIPS
DE4208980A1 (en) * 1992-03-20 1993-09-23 Rexroth Mannesmann Gmbh HYDRAULIC DRIVE DEVICE WITH A CYLINDER
DE102015212103A1 (en) * 2015-06-30 2017-01-05 Continental Teves Ag & Co. Ohg hydraulic cylinders

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5398277U (en) * 1977-01-13 1978-08-09
CN101893015A (en) * 2010-07-22 2010-11-24 烟台未来自动装备有限责任公司 Hydraulic cylinder with hydraulic on and off function for dump sanitation truck
CN103089740A (en) * 2012-12-31 2013-05-08 蚌埠液力机械有限公司 Unloading valve and unloading valve oil cylinder
CN103089740B (en) * 2012-12-31 2015-07-15 蚌埠液力机械有限公司 Unloading valve and unloading valve oil cylinder

Also Published As

Publication number Publication date
CH392812A (en) 1965-05-31
LU39435A1 (en) 1962-05-19
FR1250566A (en) 1961-01-13
BE597262A (en) 1961-05-18

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