US2843151A - Hydraulic power element - Google Patents

Hydraulic power element Download PDF

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Publication number
US2843151A
US2843151A US345065A US34506553A US2843151A US 2843151 A US2843151 A US 2843151A US 345065 A US345065 A US 345065A US 34506553 A US34506553 A US 34506553A US 2843151 A US2843151 A US 2843151A
Authority
US
United States
Prior art keywords
sleeve
power element
wall
rubber
plunger
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
US345065A
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English (en)
Inventor
Frederick A Greenawalt
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.)
Robertshaw US Holding Corp
Original Assignee
Ranco Inc
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 Ranco Inc filed Critical Ranco Inc
Priority to US345065A priority Critical patent/US2843151A/en
Priority to DER13844A priority patent/DE1013139B/de
Priority to CH333973D priority patent/CH333973A/fr
Application granted granted Critical
Publication of US2843151A publication Critical patent/US2843151A/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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
    • 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
    • F15B15/10—Characterised by the construction of the motor unit the motor being of diaphragm type

Definitions

  • the present invention relates to power elements for actuating control mechanisms 'orthe like, and more particularly to a new and improved expansible power element for providing a relatively lengthy power stroke in response to relatively small changes in volume of a fluid, such as a body of confinedthermally expansible liquid.
  • An object of the invention is the provision of an improved pressure operated power element comprising elastic, rubber-like material in the form of ian open ended tube having a transverse wall intermediate the ends thereof forming a resilient or elastic liquid impervious partion in the tube, a relatively rigid sleeve containing the tube to prevent radial expansion thereof, annularly arranged abutment means associated with the sleeve and against which one end'of the tube abuts to prevent longitudinal movement of the tube in one direction, and a fluid inletstructure associated with the sleeve at the other end of the tube-and with which the tubeis sealingly secured so that fluid introduced into the inlet structure causes the transverse wall to'move with changes in volume of the fluidinside'the tube, the abutment means preventing longitudinal movement of the tube proper by the force of the fluid whereby the transverse wall moves longitudinally of the sleeve by flexing and internal flow of the resilient mater'ial in response to given changes in the volume of the 'fluid, which
  • the elastic tubular element may beof a' single piece, in the preferred form of the invention described herein it comprises two resilient cup-shaped members having somewhat different physical characteristics and arranged'withthe bottom or end walls abutting one another to form the transverse wall and the open ends facing in opposite directions, one member being'formed of elastic material relatively impervious to the passage of liquidtherethrough or the absorption of liquids therein, and which is secured in'liquid sealing relationship with the fluid inlet structure, and the othermember being formed of 'mate'rialhavingrelatively quick recovery from deformations thereof andresistant to'abrasion and adapted to receive :acontrol mechanism actuating plunger or the like therein.
  • the invention makes possible the utilization of rubher-like material to provide an expansible element having substantially uniform power movements to actuate control mechanisms, suchas switches or valves, in response to predetermined changes in volume of. a thermally expansible liquid contained in the element and which operates under'fluid pressures of one thousand pounds per square inch and higher whereby controldevice actuating movements may be obtained in response to changes in-volume of a relatively small quantity of liquid, thus permitting relatively sensitive responses to changes in temperatures, for example.
  • the form and arrangement'ofthe components of the improved power element are such that there is no appreciable wear on the moving parts, particularly the rubber like parts, so that 2,843,151 Fatented July 15, 1953 ice 2 the power element is long lasting and accurate in operation'. 7
  • FIG. 1 is an elevational view of a power element embodying the invention
  • Figs. 2 and 3 are sectional views of the power element but on a larger scale than shown in Fig. 1, showing certain parts thereof in diflerent operative positions;
  • Fig. 4 is a sectional view of another form of exparisi ble unit which may be employed in the improved power element.
  • the improved power element is particularlysuitable for use as a thermostat to actuate control devices, such as valves or switches, in response to changes in temperatures, although it may be employed for other uses, and it is here shown and described embodied in-a thermostatic device T.
  • the thermostat T includes a base 10, which may be suitably attached to the housing orframe of a control mechanism (not shown), a sleeve 11 and an actuating plunger 12.
  • the upper end of the plunger 12 is adapted to engage a movable control member of the control mechanism to which the thermostat is attached to provide power movements to actuate the control mechanism.
  • the base 10 is' preferably of relatively rigid material, such as brass, in the form of a cup having a bottom wall 13 with a central upwardly projecting stem 15.
  • a radially extending bore 16 is formed in the bottom wall which receives one end of a capillary tube 17 which is brazed or otherwise suitably secured to the walls of the bore to form a fluid tight connection therewith.
  • An axial bore 18 extends from the inner end of the bore 16 upwardly through the stem 15 to provide a fluid conduit from the tube 17 to the interior of the base 10.
  • the other end of the tube 17 is not shown, but it may be sealed in any suitable manner or connected with a'bu'lb. In either event the-tube and bulb, if any,'are filled with a suitable liquid which expands and contracts in response to predetermined increases and decreases in temperature, as is well known in the'art.
  • -A cup-shaped member 20 is disposed in an inverted position over the stem 15 and is secured in liquid tight relation with the bottom wall of the base 10 by a flange 21 projecting radially from the open end thereof and clamped to the bottom of the base by the lower end of 'the sleeve II, which surrounds the member.
  • the flange 21 has an upstanding bead or rim 22 and the lower end of the sleeve 11 is undercut to receive the head.
  • the sleeve is secured in pressing engagement with the flange 21 by the upper edges of the member 10 rolled inwardly over an annular shoulder 24 formed about the sleeve 11, as shown.
  • the member 20 is formed of a rubber material relatively impervious to liquids and particularly to the liquid employed in the tube 17.
  • Rubber as used in this-specification and the claims includes natural and conventional synthetic rubbers.
  • a suit-able material is known as Butyl and comprises a copolymer of about 98% isobutylene and 2% isoprene.
  • a second cup-shaped resilient member 26 is disposed within the sleeve 11 and its bottom wall 27 rests on the top or end wall 28 of the member 20.
  • the member 26 is inserted into the sleeve 11 before the sleeve is secured to the base 10, as described.
  • Member 26 is preferably formed of elastic material resistant to abrasion and having the property of quickly returning to its original form after extension or stretching thereof.
  • One such material is a nitrile syn: thetic rubber known as Buna-N rubber and comprising a copolymer of butadiene and acrylonitrile.
  • the two members 20, 26 disposed as shown form a tubular unit having a transverse wall formed by the contiguous end walls 27, 28 of the members and which transverse walls form a fluid tight, elastic partition integral with the tubular walls of the respective members.
  • the sides and end wall 28 form an expansible liquid tight chamber 29 in communication with the tube 17 through bores 18, 16.
  • the two members 20, 26 could be replaced by a single elastic member, such as that shown at 30, having tubular side walls 31, a transverse wall 32 formed integral with the tubular walls, and a radially extending flange 33 at one end similar to flange 21.
  • the sleeve 11 has an annular abutment or shoulder 37 formed about the inside thereof which engages the upper end edges of the member 26 when the sleeve is attached to the base 10, as described.
  • the abutment 37 prevents upward movement of the member 26 proper, as is discussed more fully hereinafter.
  • a cylindrical plug 40 is disposed in the recessed portion of member 26 and is preferably formed of tetrafluoroethylene resin known as Teflon the surface of which has a waxy or soap-like character insofar as its frictional property is concerned so that the friction between the plug and the insides of the member 26 is inconsequential to operation of the power element.
  • Teflon tetrafluoroethylene resin
  • the lower end of the plunger 12 rests on the plug 40 and is adapted to slide freely in the sleeve 11.
  • the upper end of the plunger as viewed in the drawings, has a head 42 which rests on the upper end of the sleeve when the member 20 is in its normal or unexpanded condition as shown in Figs. 1 and 2.
  • the tube 17, bores 16, 18 and chamber 29 are filled with a suitable liquid mentioned previously, and in use the tube 17 or a major portion thereof is disposed in an area the temperature of which is to be controlled, for example.
  • a suitable liquid mentioned previously
  • the volume of the liquid increases and causes an increase in liquid volume inside the chamber 29 causing the end wall 28 of the member 20 to stretch and bulge upwardly.
  • the sides of the member 20 are prevented from radial expansion by the sleeve 11, and longitudinal movement thereof is prevented by the annular abutment 37 since the sides of the members 20, 26 are substantially non-compressible.
  • the wall 28 bulges upwardly and causes wall 27 of member 26 to be moved upwardly as illustrated in Fig. 3.
  • the movement of the plunger 12 may be relatively great with respect to the change in volume of the liquid in the chamber 23 so that the power element may be quite sensitive to changes in temperature and at the same time the power element may be relatively small and compact.
  • an element having the approximate proportions shown in the drawings in which the outside diameter of the members 20, 26 is approximately .250" and the diameter of chamber 23 about .120" will provide a power stroke of .070" and more.
  • An expansible power element comprising a rigid base member, a rigid hollow sleeve joined at one end to said base member and having the other end open to receive a plunger, a tubular rubber element inside said sleeve and having its side walls juxtaposed to and contained by the inside walls of said sleeve, said rubber element having one end open and the other end closed by a transverse wall spaced from said open end, said open end of said rubber element facing the open end of said sleeve for receiving a plunger therein, said sleeve having the inside diameter reduced to form an abutment around the inside of said sleeve against which the open end edge of said element engages to block movement of said sidewalls of said element toward said open end of said sleeve, a plunger in said sleeve extending into the open end of said element and engaging said transverse wall, and means to apply fluid pressure to said transverse wall of said element on the side thereof opposite the side engaged by said plunger for forcing said wall toward the open end
  • An expansible power element comprising a rigid base member, a rigid hollow sleeve joined at one end to said base member and having the other end open to receive a plunger, a tubular rubber element open at opposite ends and disposed inside said sleeve and having its side walls juxtaposed to and contained by the inside walls of said sleeve, rubber wall means forming a resilient partition in said element transversely thereof, one open end of said rubber element facing the open end of said sleeve for receiving a plunger therein, said sleeve having the inside diameter reduced to form an abutment around the inside of said sleeve against which the end edge of said element at said one end engages to block movement of said sidewalls of said rubber element toward said open end of said sleeve, a plunger in said sleeve extending into said open end of said rubber element and engaging said wall means, and means to apply fluid pressure to said wall means on the side thereof opposite the side engaged by said plunger for forcing said wall means toward said open end
  • An expansible power element comprising a rigid base member having a fluid passage therein, a rigid hollow sleeve joined at one end to said base member and having the other end open to receive a plunger, a tubular rubber member inside said sleeve and having its side walls juxtaposed to and contained by the inside walls of said sleeve, said rubber member having one end open and the other end closed by a transverse wall, said open end of said rubber member facing the open end of said sleeve for receiving a plunger therein, said sleeve having the inside diameter reduced to form an abutment around the inside of said sleeve against which the open end edge of said member engages to block movement of said sidewalls of said rubber member toward said open end of said sleeve, a plunger in said sleeve extending into the open end of said rubber member and engaging said transverse wall, a second cup-shape rubber member having the side walls thereof juxtaposed to and contained by the inside walls of said slee

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Temperature-Responsive Valves (AREA)
US345065A 1953-03-27 1953-03-27 Hydraulic power element Expired - Lifetime US2843151A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US345065A US2843151A (en) 1953-03-27 1953-03-27 Hydraulic power element
DER13844A DE1013139B (de) 1953-03-27 1954-03-23 Ausdehnbares Kraftelement
CH333973D CH333973A (fr) 1953-03-27 1954-03-27 Dispositif destiné notamment à actionner un mécanisme de commande

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US345065A US2843151A (en) 1953-03-27 1953-03-27 Hydraulic power element

Publications (1)

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US2843151A true US2843151A (en) 1958-07-15

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US (1) US2843151A (fr)
CH (1) CH333973A (fr)
DE (1) DE1013139B (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131563A (en) * 1958-12-24 1964-05-05 Jack A Britton Thermal power device
US3367575A (en) * 1965-11-19 1968-02-06 Ranco Inc Actuator
US3435733A (en) * 1965-07-16 1969-04-01 Daimler Benz Ag Elastic seal between cylinder and piston
US3441049A (en) * 1965-10-22 1969-04-29 Robertshaw Controls Co Cartridge type pressure regulator
US3799037A (en) * 1972-03-14 1974-03-26 H Schmidt Valve attachment
US4014311A (en) * 1975-08-19 1977-03-29 Silicon Technology Corporation Hydraulic blade mount
US4279573A (en) * 1979-07-27 1981-07-21 Rychlik Frank J High pressure pump
US5052276A (en) * 1990-06-18 1991-10-01 Halsey George H Diaphragm construction
US5176317A (en) * 1989-01-27 1993-01-05 Hyundai Motor Co. Thermally responsive valve
US5345857A (en) * 1993-02-02 1994-09-13 Osmonics, Inc. Thermoplastic bellows and method of forming the same
EP1054165A1 (fr) * 1999-05-17 2000-11-22 Ronflette S.A. Un vérin hydraulique
US20090113804A1 (en) * 2003-05-12 2009-05-07 Justin Luke Manny Barrier Release Mechanism

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1199575B (de) 1959-10-09 1965-08-26 Stamicarbon UEberdruckventil
DE1234470B (de) * 1962-03-21 1967-02-16 Bendix Corp Hydraulische Vorrichtung zum Betaetigen des Steuerventils eines Stroemungsdruckantriebes od. dgl.
DE4119467C2 (de) * 1991-06-13 1996-10-17 Daimler Benz Ag Nach dem Verdrängerprinzip arbeitende Vorrichtung zur Kraft- und Hubübersetzung bzw. -übertragung
DE19534181A1 (de) * 1995-09-15 1997-03-27 Danfoss As Ferneinstellvorrichtung, insbesondere für eine Heizeinrichtung

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1924888A (en) * 1929-12-28 1933-08-29 Lewis Differential Company Fluid pressure operated device
US1959265A (en) * 1934-05-15 Thermostatic valve device
US1994388A (en) * 1930-07-18 1935-03-12 Erichsen Abraham Martinius Apparatus for measuring and indicating forces
US2114091A (en) * 1935-11-22 1938-04-12 Carroll B Vickers Power distributing and equalizer means
US2307671A (en) * 1941-09-20 1943-01-05 Gen Tire & Rubber Co Piston for fluid actuated devices
GB577283A (en) * 1941-08-29 1946-05-13 Power Jets Ltd Transmitter-type pressure gauges and the like
US2467629A (en) * 1948-10-11 1949-04-19 Louis R O'neill Spot welding gun
US2532143A (en) * 1946-04-06 1950-11-28 Jack & Heintz Prec Ind Inc Accumulator
US2534497A (en) * 1947-06-12 1950-12-19 John C Albright Motion transmitting device
US2642747A (en) * 1946-12-04 1953-06-23 American Machine & Metals Air volume regulator
US2654559A (en) * 1950-03-08 1953-10-06 Imp Brass Mfg Co Diaphragm valve
FR1048184A (fr) * 1951-01-08 1953-12-21 Oerlikon Buehrle Ag Chambre de pression avec carter et membrane
US2681800A (en) * 1952-02-21 1954-06-22 Wales Strippit Corp Spring utilizing a compressible solid

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE695836C (de) * 1937-04-20 1941-02-05 Benzol Verband G M B H Vorrichtung zur Gleichhaltung des Entspannungsdruckes bei Druckmindervorrichtungen fuer gespeicherte Gase oder Fluessigkeiten, insbesondere zum Betreiben von Brennkraftmaschinen
US2271307A (en) * 1938-10-21 1942-01-27 William A Ray Thermal operator
FR898488A (fr) * 1943-05-21 1945-04-24 Système de montage et de guidage d'enceintes étanches à volume variable
US2548878A (en) * 1948-12-30 1951-04-17 Detroit Lubricator Co Thermostatic valve having sealing diaphragm and supporting means therefor

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1959265A (en) * 1934-05-15 Thermostatic valve device
US1924888A (en) * 1929-12-28 1933-08-29 Lewis Differential Company Fluid pressure operated device
US1994388A (en) * 1930-07-18 1935-03-12 Erichsen Abraham Martinius Apparatus for measuring and indicating forces
US2114091A (en) * 1935-11-22 1938-04-12 Carroll B Vickers Power distributing and equalizer means
GB577283A (en) * 1941-08-29 1946-05-13 Power Jets Ltd Transmitter-type pressure gauges and the like
US2307671A (en) * 1941-09-20 1943-01-05 Gen Tire & Rubber Co Piston for fluid actuated devices
US2532143A (en) * 1946-04-06 1950-11-28 Jack & Heintz Prec Ind Inc Accumulator
US2642747A (en) * 1946-12-04 1953-06-23 American Machine & Metals Air volume regulator
US2534497A (en) * 1947-06-12 1950-12-19 John C Albright Motion transmitting device
US2467629A (en) * 1948-10-11 1949-04-19 Louis R O'neill Spot welding gun
US2654559A (en) * 1950-03-08 1953-10-06 Imp Brass Mfg Co Diaphragm valve
FR1048184A (fr) * 1951-01-08 1953-12-21 Oerlikon Buehrle Ag Chambre de pression avec carter et membrane
US2681800A (en) * 1952-02-21 1954-06-22 Wales Strippit Corp Spring utilizing a compressible solid

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131563A (en) * 1958-12-24 1964-05-05 Jack A Britton Thermal power device
US3435733A (en) * 1965-07-16 1969-04-01 Daimler Benz Ag Elastic seal between cylinder and piston
US3441049A (en) * 1965-10-22 1969-04-29 Robertshaw Controls Co Cartridge type pressure regulator
US3367575A (en) * 1965-11-19 1968-02-06 Ranco Inc Actuator
US3799037A (en) * 1972-03-14 1974-03-26 H Schmidt Valve attachment
US4014311A (en) * 1975-08-19 1977-03-29 Silicon Technology Corporation Hydraulic blade mount
US4279573A (en) * 1979-07-27 1981-07-21 Rychlik Frank J High pressure pump
US5176317A (en) * 1989-01-27 1993-01-05 Hyundai Motor Co. Thermally responsive valve
US5052276A (en) * 1990-06-18 1991-10-01 Halsey George H Diaphragm construction
US5345857A (en) * 1993-02-02 1994-09-13 Osmonics, Inc. Thermoplastic bellows and method of forming the same
EP1054165A1 (fr) * 1999-05-17 2000-11-22 Ronflette S.A. Un vérin hydraulique
US20090113804A1 (en) * 2003-05-12 2009-05-07 Justin Luke Manny Barrier Release Mechanism
US8985644B2 (en) 2003-05-12 2015-03-24 Breakout Barrier Release Systems Pty. Ltd. Barrier release mechanism

Also Published As

Publication number Publication date
CH333973A (fr) 1958-11-15
DE1013139B (de) 1957-08-01

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