US2791298A - Liquid filled dash pot device - Google Patents

Liquid filled dash pot device Download PDF

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Publication number
US2791298A
US2791298A US512236A US51223655A US2791298A US 2791298 A US2791298 A US 2791298A US 512236 A US512236 A US 512236A US 51223655 A US51223655 A US 51223655A US 2791298 A US2791298 A US 2791298A
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US
United States
Prior art keywords
dash pot
diaphragm
chambers
piston
liquid filled
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 - Lifetime
Application number
US512236A
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English (en)
Inventor
White Joseph
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.)
Siemens Mobility Ltd
Original Assignee
Westinghouse Brake and Signal Co Ltd
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 Westinghouse Brake and Signal Co Ltd filed Critical Westinghouse Brake and Signal Co Ltd
Application granted granted Critical
Publication of US2791298A publication Critical patent/US2791298A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
    • F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
    • F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts

Definitions

  • Such devices usually comprise a piston operating in a liquid filled closed cylinder, the piston being provided with grooves or pierced by one or more ports of small bore through which the liquid is forced from one side of the piston to the other during the piston stroke.
  • dash pot devices of this kind difficulty is experienced in guarding against leakage of the liquid from the cylinder and also in the provision of arrangements for the transmission of a direct thrust through the device without the use of some form lof lever mechanism.
  • Dash pot devices herein referred to as of the kind described have been proposed which largely eliminate these disadvantages comprising a liquid filled cylinder closed at each end respectively by a flexible diaphragm and having intermediate its end an internal partition defining with said diaphragms two chambers, one on either side of the partition, permanently in communication one with the other through a restricted passage and having each a piston slidable therein with a spare or secondary chamber between each piston and its associated diaphragm and a stem passing slidably through an opening in the partition and rigidly connecting said diaphragms and said pistons.
  • a dash pot device of the kind described is provided with a relatively large passage between the two secondary chambers.
  • the dash pot device here shown comprises a hollow cylindrical body 9 closed at each end by flexible diaphragms and 14 respectively secured around their peripheries by clamping rings 7 and fitting into annular recesses 13 formed in the end faces of the cylindrical body and secured by a number of screws 6 so as to form a liquid tight joint.
  • the cylinder is divided into two equal chambers 16, 18 by an inwardly extending radial rib or partition 10, through a central aperture in which passes, with a sliding fit, a tubular sleeve 11.
  • Clamped to the inside surface of each diaphragm respectively are pistons 8, 12 spaced apart by the sleeve 11 and defining with the diaphragms 5 and 14 secondary chambers 21, 30 respectively.
  • the pistons are a good sliding fit in the chambers 16 and 18 and a suitable form of packing (not shown) may be provided to 2,791 ,Z918 Patented May 7, 195,7
  • Each diaphragm, and piston is provided with a central axial hole, all coaxially aligned with the boreof sleeve '11 and passing Vthrough these holes and the boreof the sleeve Vis a bolt or stem.19 having a fiat head 15.at one end and threadedV at its other end to receive .a nut 3, va collark 4 being inserted between the .nut Sand ⁇ the diaphragm ⁇ 5. The nut 3 tightly clamps together the two diaphragms, pistons, andthe sleeve.
  • the whole cylinder is filled With oil and Va small port '17 is provided in Lthe partition, vthrough which oil i's forced from one -chamber to the other during the stroke of the piston assembly.
  • Va small port '17 is provided in Lthe partition, vthrough which oil i's forced from one -chamber to the other during the stroke of the piston assembly.
  • Establishing permanent communication Ibetween the two secondary chambers 20 and 21 is a passage 22 formed in the body 9 and of sufficient size to allow free flow of oil between those two secondary chambers.
  • the drawing shows, to illustrate one way in which a thrust may be transmitted through the dash pot device, a spring 2 located between the collar 4 and a spring cap 1.
  • a downward thrust applied to the cap 1 will thus be transmitted through the spring to the collar 4 and thus to the diaphragm assembly which will move downwards, forcing oil from chamber 18 to chamber 16 through the restricted passage 17 piercing the partition 10.
  • This downwards movement may, of course, be transmitted through the head 15 of the stem 19 to carry out any suitable function, such as the opening or closing of a valve.
  • a dash pot device comprising, in combination, a liquid filled cylindrical body; a first flexible diaphragm clamped around its periphery to one end of said body forming a liquid-tight seal; a second iiexible diaphragm clamped around its periphery to the other end of said body forming a liquid-tight seal; a radial transverse partition fixed to the cylindrical body defining with said first and said second diaphragm two chambers within said cylindrical body and pierced by a hole coaxial with the bore of said cylindrical body; a first piston in one of said chambers and clamped to said first diaphragm and defining a first secondary chamber therebetween; a second piston in the other of said chambers and clamped to said second diaphragm and defining a second secondary chamber therebetween; a coaxial stem rigidly connecting said diaphragms and said pistons and passing through said hole in said partition and lbeing a sliding fit therein; means constituting
  • a dash pot device comprising, in combination, a liquid filled hollow cylindrical body; a first flexible diaphragm clamped around its periphery to one end of said body forming a uid tight closure member therefor; a second fiexible diaphragm clamped around its periphery to the other end of said body forming a uid tight closure member therefor; a radially disposed internal partition fixed to the cylindrical body defining with said rst and said second diaphragms two substantially equal chambers within said cylindrical body; a first piston in one of said chambers defining with said first diaphragm a secondary chamber therebetween; a second piston in the other of said chambers defining with said second diaphragm a second secondary chamber therebetween; a co-'axial hollow sleeve passing slidably through a co-axial hole in said .partition and spacing apart said pistons; a bolt passing through a central hole in each of said diaphragms and said piston

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Damping Devices (AREA)
US512236A 1954-07-06 1955-05-31 Liquid filled dash pot device Expired - Lifetime US2791298A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2791298X 1954-07-06

Publications (1)

Publication Number Publication Date
US2791298A true US2791298A (en) 1957-05-07

Family

ID=10915394

Family Applications (1)

Application Number Title Priority Date Filing Date
US512236A Expired - Lifetime US2791298A (en) 1954-07-06 1955-05-31 Liquid filled dash pot device

Country Status (3)

Country Link
US (1) US2791298A (enrdf_load_stackoverflow)
DE (1) DE1032038B (enrdf_load_stackoverflow)
NL (2) NL197387A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315701A (en) * 1962-08-13 1967-04-25 Fmc Corp Flow timing device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3940004A1 (de) * 1989-12-02 1991-06-06 Freudenberg Carl Fa Motorlager mit hydraulischer daempfung
DE4223786A1 (de) * 1992-07-15 1994-01-20 Gerb Schwingungsisolierungen Schwingungsdämpfer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE575715C (de) * 1933-05-02 Heinrich Waas Dipl Ing Abschliessung einer Daempfungseinrichtung mittels einer Membran
US2029829A (en) * 1932-05-10 1936-02-04 Messier Yvonne Lucie System for ensuring fluid-tightness for horizontal hydraulic cylinders
US2533226A (en) * 1945-05-30 1950-12-12 Vibradamp Inc Hydraulic damping mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE575715C (de) * 1933-05-02 Heinrich Waas Dipl Ing Abschliessung einer Daempfungseinrichtung mittels einer Membran
US2029829A (en) * 1932-05-10 1936-02-04 Messier Yvonne Lucie System for ensuring fluid-tightness for horizontal hydraulic cylinders
US2533226A (en) * 1945-05-30 1950-12-12 Vibradamp Inc Hydraulic damping mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315701A (en) * 1962-08-13 1967-04-25 Fmc Corp Flow timing device

Also Published As

Publication number Publication date
NL197387A (enrdf_load_stackoverflow)
NL99573C (enrdf_load_stackoverflow)
DE1032038B (de) 1958-06-12

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