GB1322871A - Force-measuring apparatuses - Google Patents

Force-measuring apparatuses

Info

Publication number
GB1322871A
GB1322871A GB82072A GB82072A GB1322871A GB 1322871 A GB1322871 A GB 1322871A GB 82072 A GB82072 A GB 82072A GB 82072 A GB82072 A GB 82072A GB 1322871 A GB1322871 A GB 1322871A
Authority
GB
United Kingdom
Prior art keywords
weight
string
frequency
linear
spring
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
GB82072A
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.)
Mettler Instrumente AG
Original Assignee
Mettler Instrumente AG
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
Priority claimed from CH915771A external-priority patent/CH533296A/en
Priority claimed from CH1417471A external-priority patent/CH542502A/en
Application filed by Mettler Instrumente AG filed Critical Mettler Instrumente AG
Publication of GB1322871A publication Critical patent/GB1322871A/en
Expired 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
    • G01G3/16—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 frequency of oscillations of the body
    • G01G3/165—Constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G1/00—Weighing apparatus involving the use of a counterweight or other counterbalancing mass
    • G01G1/18—Balances involving the use of a pivoted beam, i.e. beam balances
    • G01G1/24—Platform-type scales, i.e. having the pans carried above the beam
    • G01G1/243—Platform-type scales, i.e. having the pans carried above the beam having pans carried above the beam
    • G01G1/246—Platform-type scales, i.e. having the pans carried above the beam having pans carried above the beam of the parallelogram type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/24—Guides or linkages for ensuring parallel motion of the weigh-pans
    • G01G21/244—Guides or linkages for ensuring parallel motion of the weigh-pans combined with flexure-plate fulcrums
    • 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
    • G01L1/08—Measuring force or stress, in general by the use of counterbalancing forces
    • G01L1/086—Measuring force or stress, in general by the use of counterbalancing forces using electrostatic or electromagnetic counterbalancing forces
    • 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
    • G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
    • G01L1/106—Constructional details

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Measurement Of Force In General (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

1322871 Weighing electrically METTLER INSTRUMENTE A G 7 Jan 1972 [23 June 1971 29 Sept 1971] 820/72 Headings G1N and G1W] To obtain a linear relationship between weight and the natural resonant frequency of a vibrating string subjected to the weight, an auxiliary, non- linear force is algebraically added to the weight. As shown Fig.1, a pan assembly 15, 16 supported by two spring links 13, 14 from a fixed pillar 12, is attached by a spring 20 to a string 19 suspended from an arm 18 of the pillar 12. The string 19 is made to vibrate transversely at its natural resonant frequency by unit 23, which frequency is indicative of the weight in the scale pan 16. The pan carrier 15 also carries a permanent magnet 26 co-operating with a fixed magnet 27 to produce an additional non-linear force on the string 19, which can be adjusted by a screw 30 to linearise the relationship between vibration frequency and weight. Hunting is reduced by an eddy current brake 32, 33. In modifications the auxiliary non- linear force is provided by a non-linear spring, or a variable length lever arm for the movable part, separately or in combination. In a further embodiment Fig. 12, the non assembly 15, 16 is attached to two strings 19, 19' whose tensions and vibration frequencies vary in opposite directions with applied weight, and the frequency difference is determined, linearization being provided by magnets 46, 47 and 48.
GB82072A 1971-06-23 1972-01-07 Force-measuring apparatuses Expired GB1322871A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH915771A CH533296A (en) 1971-06-23 1971-06-23 Dynamometer
CH1417471A CH542502A (en) 1967-12-11 1971-09-29 Dynamometer

Publications (1)

Publication Number Publication Date
GB1322871A true GB1322871A (en) 1973-07-11

Family

ID=25704355

Family Applications (1)

Application Number Title Priority Date Filing Date
GB82072A Expired GB1322871A (en) 1971-06-23 1972-01-07 Force-measuring apparatuses

Country Status (4)

Country Link
DE (1) DE2219727C3 (en)
FR (1) FR2136472A5 (en)
GB (1) GB1322871A (en)
NL (1) NL7201691A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128329A (en) * 1982-10-05 1984-04-26 Yamato Scale Co Ltd Vibrating wire for sensor
US4453778A (en) * 1980-01-10 1984-06-12 Ford Motor Company Proportioning hydraulic brake mechanism
GB2134258A (en) * 1983-01-18 1984-08-08 Ohaus Scale Corp Weighing scale transducer system
GB2190748A (en) * 1986-05-20 1987-11-25 Shinko Denshi Kk Load measuring apparatus of vibration type with linear characteristic
US5313023A (en) 1992-04-03 1994-05-17 Weigh-Tronix, Inc. Load cell
US5336854A (en) 1992-04-03 1994-08-09 Weigh-Tronix, Inc. Electronic force sensing load cell
US5391844A (en) 1992-04-03 1995-02-21 Weigh-Tronix Inc Load cell
US5442146A (en) 1992-04-03 1995-08-15 Weigh-Tronix, Inc. Counting scale and load cell assembly therefor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH538683A (en) * 1971-11-23 1973-06-30 Mettler Instrumente Ag Force or length meter
DE3023565C2 (en) * 1980-06-20 1985-05-09 Francotyp - Postalia GmbH, 1000 Berlin Weighing device with a vibrating string
US4372173A (en) * 1980-10-20 1983-02-08 Quartex, Inc. Resonator force transducer
CH656711A5 (en) * 1982-07-16 1986-07-15 Mettler Instrumente Ag WEIGHING CELL.

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4453778A (en) * 1980-01-10 1984-06-12 Ford Motor Company Proportioning hydraulic brake mechanism
GB2128329A (en) * 1982-10-05 1984-04-26 Yamato Scale Co Ltd Vibrating wire for sensor
GB2134258A (en) * 1983-01-18 1984-08-08 Ohaus Scale Corp Weighing scale transducer system
US4526247A (en) * 1983-01-18 1985-07-02 Ohaus Scale Corporation Weighing scale transducer
GB2190748A (en) * 1986-05-20 1987-11-25 Shinko Denshi Kk Load measuring apparatus of vibration type with linear characteristic
US5313023A (en) 1992-04-03 1994-05-17 Weigh-Tronix, Inc. Load cell
US5336854A (en) 1992-04-03 1994-08-09 Weigh-Tronix, Inc. Electronic force sensing load cell
US5391844A (en) 1992-04-03 1995-02-21 Weigh-Tronix Inc Load cell
US5442146A (en) 1992-04-03 1995-08-15 Weigh-Tronix, Inc. Counting scale and load cell assembly therefor

Also Published As

Publication number Publication date
NL7201691A (en) 1972-12-28
DE2219727C3 (en) 1981-02-19
DE2219727B2 (en) 1980-06-04
FR2136472A5 (en) 1972-12-22
DE2219727A1 (en) 1972-12-28

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee