US3626814A - Load-measuring devices - Google Patents

Load-measuring devices Download PDF

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Publication number
US3626814A
US3626814A US871838A US3626814DA US3626814A US 3626814 A US3626814 A US 3626814A US 871838 A US871838 A US 871838A US 3626814D A US3626814D A US 3626814DA US 3626814 A US3626814 A US 3626814A
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US
United States
Prior art keywords
diaphragm
abutment surface
chamber
load
sealing
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
US871838A
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English (en)
Inventor
Erik Edvard Andersson
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Individual
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Individual
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Filing date
Publication date
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Application granted granted Critical
Publication of US3626814A publication Critical patent/US3626814A/en
Anticipated expiration legal-status Critical
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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
    • G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
    • G05D16/0638—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane characterised by the form of the obturator
    • G05D16/0641—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane characterised by the form of the obturator the obturator is a membrane
    • 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 a device for unloading force from a pressure chamber having one flexible wall connected witha movement-unloading means and having an inlet for pressure medium at least on one side of the wall.
  • the use of such arrangements or load-measuring devices for difi'erent purposes is steadily increasing. It has been discovered, however, that the flexible wall is liable to failure as a result of the fatigue stresses occuring when the device is in use, which in many cases may cause serious breakdowns in operation and production, for example when the device forms part of a complicated operating or control system.
  • one object of the present invention is to provide a simple device which circumvents the aforementioned disadvantage and extends the operational life of the flexible wall of the load-measuring device defined in the foregoing.
  • the device of the invention is mainly characterized in that there is provided adjacent the circumference of the inside of the chamber a guide surface with which the edge portion of the flexible wall engages when subjected to pressure and which is formed as the section surface between a ring-shaped, for example, circular, elliptical, or rectangular, closed cylindrical hollow body, the corners of which are rounded to a greater or lesser extent, 'and a single-curve surface, the generatrices of which are perpendicular to the generatrices of the wall of the hollow body.
  • a guide surface with which the edge portion of the flexible wall engages when subjected to pressure and which is formed as the section surface between a ring-shaped, for example, circular, elliptical, or rectangular, closed cylindrical hollow body, the corners of which are rounded to a greater or lesser extent, 'and a single-curve surface, the generatrices of which are perpendicular to the generatrices of the wall of the hollow body.
  • a further advantage afforded by the device of the invention over the conventional attachment of the flexible wall, is that the wall functions to a considerable extent as a return means, thereby obviating the necessity of embodying special return springs in the device.
  • the guide surface extends in an undulating manner from the two highest opposing points to the two lowest opposing points.
  • the flexible wall comprises a sealing diaphragm made of rubber, for example, or some other flexible material, and a diaphragm made of metal, for example, such as spring steel and supporting the first-mentioned diaphragm, the rubber diaphragm being provided at those positions most liable to deformation when subjected to pressure, that is the positions opposite the lowest points on the guide surface, with outwardly bulging portions of such form that the rubber material need not be stretched, at least to any appreciable extent, when the diaphragm is deformed by the actuation of the pressure medium.
  • FIG. I is a plan view of a load-measuring device provided with the arrangement of the invention
  • FIGS. 4 and 5 are corresponding sectional views of the device of FIG. 1 in an unloaded condition
  • FIG. 6 is a plan view of a preferred construction of a sealing diaphragm
  • FIGS. 12-19 illustrate the component parts of the embodiment of FIG. 11 in an unassembled condition
  • FIG. 20 shows in perspective another preferred embodiment of the sealing diaphragm placed on the support diaphragm in an unloaded condition.
  • a load-measuring device or pressure cell 1 which comprises an upper cover member 2 and a lower cover member 3, defining a pressure chamber in which is arranged a diaphragm 4 made of metal, for example, such as spring steel.
  • the center portion of the diaphragm is connected to a force-unloading means in the form of a piston rod 5.
  • Pressure medium for example air under pressure, is passed to the load-measuring device, via an opening 6.
  • a device for unloading the force from a pressure chamber having a diaphragm member connected with a movable force-unloading means and presenting an inlet for pressurized fluid at least on one side of the diaphragm member
  • annular abutment surface provided adjacent the circumference of the inside of the chamber with which the edge portion of the diaphragm member engages when placed under load, which surface has the form of the intersection between a hollow body having the shape of said chamber's circumference and a cylindrical surface having an axis which is perpendicular to that of the hollow body, wherein the abutment surface has two opposing elevations and two opposing depressions therein, and the abutment surface extends in the form of an arch from the elevations to the depressions and wherein the diaphragm member comprises a sealing diaphragm made of rubber or other flexible material, and a second diaphragm supporting said sealing diaphragm and being made of metal, such as spring steel, said rubber diaphragm at the positions most liable to deform under load, said positions being opposite the depressions on the abutment surface, is provided with axially outwardly bulging portions of such form that when the diaphragm is deformed under pressure the material of the diaphra
  • sealing diaphragm is provided around the periphery thereof with a lip secured between a clamping surface, which may be the edge of a clamping ring and extends peripherally beyond the abutment surface, and a portion of the wall of the chamber, while the support diaphragm rests freely on the abutment surface.
  • diap ragm member being made of metal, such as spring steel is embodied in the diap ragm member and serves as the diaphragm return means, thereby obviating the need of special return springs or like member.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Reciprocating Pumps (AREA)
  • Measuring Fluid Pressure (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
US871838A 1968-10-30 1969-10-28 Load-measuring devices Expired - Lifetime US3626814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE14689/68A SE325780B (enrdf_load_stackoverflow) 1968-10-30 1968-10-30

Publications (1)

Publication Number Publication Date
US3626814A true US3626814A (en) 1971-12-14

Family

ID=20299496

Family Applications (1)

Application Number Title Priority Date Filing Date
US871838A Expired - Lifetime US3626814A (en) 1968-10-30 1969-10-28 Load-measuring devices

Country Status (3)

Country Link
US (1) US3626814A (enrdf_load_stackoverflow)
DE (1) DE1954410B2 (enrdf_load_stackoverflow)
SE (1) SE325780B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939758A (en) * 1972-09-20 1976-02-24 Jacques Faisandier Pressure sensor
US4035107A (en) * 1975-04-07 1977-07-12 Durotech Co. Pump system for high pressure abrasive liquids
US20030074977A1 (en) * 1999-12-07 2003-04-24 Guenter Doemens Actuator-integrated force sensor
US20190178737A1 (en) * 2017-12-08 2019-06-13 Chin Ray Industrial Ltd. Pressure Gauge Structure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4557347A (en) * 1981-07-14 1985-12-10 Karl Eickmann Fluid pumps, fluid motors and devices, wherein they are applied
DE3145756A1 (de) * 1981-11-19 1983-05-26 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover Membranzylinder, insbesondere fuer druckmittelbetaetigte fahrzeugbremsanlagen

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1806360A (en) * 1928-08-14 1931-05-19 Moller Ernst Diaphragm piston, in particular for control valves for air brakes
US2015374A (en) * 1932-03-17 1935-09-24 Avery S Baker Suction operated device for spark control
US2517056A (en) * 1942-06-02 1950-08-01 Trubert Rene Thermostatic mixer
US2953166A (en) * 1957-11-22 1960-09-20 Honeywell Regulator Co Diaphragm support
US3072150A (en) * 1959-11-03 1963-01-08 American Radiator & Standard Pressure-responsive device
US3224345A (en) * 1962-07-16 1965-12-21 Doetsch Hans Peter Diaphragm support
US3400908A (en) * 1965-01-08 1968-09-10 Bowles Eng Corp Throttle valve construction
US3414235A (en) * 1964-12-30 1968-12-03 Henry Marie Joseph Georges Lumpp Diaphragm carrying systems

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1806360A (en) * 1928-08-14 1931-05-19 Moller Ernst Diaphragm piston, in particular for control valves for air brakes
US2015374A (en) * 1932-03-17 1935-09-24 Avery S Baker Suction operated device for spark control
US2517056A (en) * 1942-06-02 1950-08-01 Trubert Rene Thermostatic mixer
US2953166A (en) * 1957-11-22 1960-09-20 Honeywell Regulator Co Diaphragm support
US3072150A (en) * 1959-11-03 1963-01-08 American Radiator & Standard Pressure-responsive device
US3224345A (en) * 1962-07-16 1965-12-21 Doetsch Hans Peter Diaphragm support
US3414235A (en) * 1964-12-30 1968-12-03 Henry Marie Joseph Georges Lumpp Diaphragm carrying systems
US3400908A (en) * 1965-01-08 1968-09-10 Bowles Eng Corp Throttle valve construction

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3939758A (en) * 1972-09-20 1976-02-24 Jacques Faisandier Pressure sensor
US4035107A (en) * 1975-04-07 1977-07-12 Durotech Co. Pump system for high pressure abrasive liquids
US20030074977A1 (en) * 1999-12-07 2003-04-24 Guenter Doemens Actuator-integrated force sensor
US6772647B2 (en) * 1999-12-07 2004-08-10 Pacifica Group Technologies Pty Ltd. Actuator-integrated force sensor
US20190178737A1 (en) * 2017-12-08 2019-06-13 Chin Ray Industrial Ltd. Pressure Gauge Structure
US10488285B2 (en) * 2017-12-08 2019-11-26 Chin Ray Industrial Ltd. Pressure gauge structure

Also Published As

Publication number Publication date
DE1954410B2 (de) 1971-12-30
SE325780B (enrdf_load_stackoverflow) 1970-07-06
DE1954410A1 (de) 1970-05-21

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