CA2224729A1 - Force sensitive scale and dual sensor load cell for use therewith - Google Patents

Force sensitive scale and dual sensor load cell for use therewith

Info

Publication number
CA2224729A1
CA2224729A1 CA002224729A CA2224729A CA2224729A1 CA 2224729 A1 CA2224729 A1 CA 2224729A1 CA 002224729 A CA002224729 A CA 002224729A CA 2224729 A CA2224729 A CA 2224729A CA 2224729 A1 CA2224729 A1 CA 2224729A1
Authority
CA
Canada
Prior art keywords
scale
use therewith
dual sensor
force sensitive
load cell
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.)
Granted
Application number
CA002224729A
Other languages
French (fr)
Other versions
CA2224729C (en
Inventor
Thomas H. Johnson
Roger A. Younger
Gene L. Justice
Kevin M. Fruechte
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.)
Avery Weigh Tronix Ltd
Original Assignee
Weigh-Tronix, Inc.
Thomas H. Johnson
Roger A. Younger
Gene L. Justice
Kevin M. Fruechte
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 Weigh-Tronix, Inc., Thomas H. Johnson, Roger A. Younger, Gene L. Justice, Kevin M. Fruechte filed Critical Weigh-Tronix, Inc.
Publication of CA2224729A1 publication Critical patent/CA2224729A1/en
Application granted granted Critical
Publication of CA2224729C publication Critical patent/CA2224729C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
    • G01G3/1414—Arrangements for correcting or for compensating for unwanted effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/08—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles
    • G01G19/083—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles lift truck scale
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
    • G01G3/1402—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01G3/1404—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports combined with means to connect the strain gauges on electrical bridges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01L1/2218—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction
    • G01L1/2225—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction the direction being perpendicular to the central axis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/225—Measuring circuits therefor
    • G01L1/2262—Measuring circuits therefor involving simple electrical bridges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2268—Arrangements for correcting or for compensating unwanted effects
    • G01L1/2281—Arrangements for correcting or for compensating unwanted effects for temperature variations

Abstract

A force sensitive scale and dual sensor load cells for use therewith isolate, measure, and reject out residual rejected effects from the output of the scale. By isolating residual rejected effects, the overall accuracy of the scale may be improved, and the scale may be made substantially insensitive to the position of an object on the scale. In addition, where a scale includes multipleload cells coupled in parallel to a load receiving member and spaced apart in the direction of the force vector, the outputs of the load cells may be effectively scaled to cancel out frictional effects inherent in the scale.
CA002224729A 1995-06-16 1996-06-11 Force sensitive scale and dual sensor load cell for use therewith Expired - Lifetime CA2224729C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/491,034 1995-06-16
US08/491,034 US5837946A (en) 1995-06-16 1995-06-16 Force sensitive scale and dual load sensor cell for use therewith
PCT/US1996/010204 WO1997000427A1 (en) 1995-06-16 1996-06-11 Force sensitive scale and dual sensor load cell for use therewith

Publications (2)

Publication Number Publication Date
CA2224729A1 true CA2224729A1 (en) 1997-01-03
CA2224729C CA2224729C (en) 2008-04-01

Family

ID=23950529

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002224729A Expired - Lifetime CA2224729C (en) 1995-06-16 1996-06-11 Force sensitive scale and dual sensor load cell for use therewith

Country Status (5)

Country Link
US (2) US5837946A (en)
EP (2) EP0832420B1 (en)
CA (1) CA2224729C (en)
DE (1) DE69618590T2 (en)
WO (1) WO1997000427A1 (en)

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Also Published As

Publication number Publication date
EP0832420B1 (en) 2002-01-16
WO1997000427A1 (en) 1997-01-03
US6002090A (en) 1999-12-14
DE69618590D1 (en) 2002-02-21
EP1162436A2 (en) 2001-12-12
US5837946A (en) 1998-11-17
EP1162436A3 (en) 2001-12-19
EP0832420A1 (en) 1998-04-01
DE69618590T2 (en) 2002-09-12
CA2224729C (en) 2008-04-01

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Effective date: 20160613