GB1453934A - Electrical weighing systems - Google Patents
Electrical weighing systemsInfo
- Publication number
- GB1453934A GB1453934A GB46673A GB46673A GB1453934A GB 1453934 A GB1453934 A GB 1453934A GB 46673 A GB46673 A GB 46673A GB 46673 A GB46673 A GB 46673A GB 1453934 A GB1453934 A GB 1453934A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plates
- load
- circuit
- charge
- jan
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups
- G01G7/06—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups by electrostatic action
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
1453934 Electrical weighing system PROBE ENG CO Ltd 3 Jan 1974 [4 Jan 1973] 466/73 Heading G1N A load sensing transducer comprises a pair of generally flat conductors 1, 2, spaced parallel having leads 14 and separated by a cell or cells which are closed and having flexible side walls as in the plastics or rubber foam 4 and held apart by discrete resilient bodies 4 between which and conductors 1 and 2 an air space is left. Items 4 may be set in grooves in the plates or grooves formed by conducting plates attached to plates 1 and 2. Instead of item 4 a thin walled tube may be bonded to plates 1, 2 or thin strips of metal, plastics or rubber, with, at the edges, bonding, which is insulating if metal is used. Reinforcement by membranes 12 may be used, around or between the edges of plates 1, 2, which bear temperature sensitive elements 18, with leads 19, and are separated by insulators 15 from load-bearing plates 16, 17. Overload is indicated by the short circuit caused by stops 13. In Figs. 6 and 7, O is an oscillator of fixed amplitude and frequency, C the capacitance of plates 1, 2; A, A2 are high gain inverting amplifiers, Z is a stable impedance, # a phase splitter and SD a synchronous detector. Stray capacitances CS1 and CS2 and leakage resistance across C do not affect the circuit. One of the resistors Ro, Ri is an element 18. Negative coefficient thermistors, T, may form, with Rx, Ry, resistance Ri and output O/P 2 may be read on a digital voltmeter. Automatic or manual zero correction for barometric pressure may be applied to the input of A2, but is unnecessary with the circuit of Fig. 9, in which low pass filter F prevents mechanical oscillations of the load from causing voltage oscillation on C1, and charge flows into high gain inverting amplifier A3 until monostable circuit M is triggered causing counter CT to register and charge in Co to be discharged into the input of A3 in opposition. The action is repetitive and the total charge from Co equals the total charge from C1 and is proportional to the number of operations of M. Load removal does not cause counts because diode D conducts, but further loads cause additive counting.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB46673A GB1453934A (en) | 1973-01-04 | 1973-01-04 | Electrical weighing systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB46673A GB1453934A (en) | 1973-01-04 | 1973-01-04 | Electrical weighing systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1453934A true GB1453934A (en) | 1976-10-27 |
Family
ID=9704854
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB46673A Expired GB1453934A (en) | 1973-01-04 | 1973-01-04 | Electrical weighing systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1453934A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0123646A2 (en) * | 1983-02-23 | 1984-10-31 | Christof W. Burckhardt | Capacitive force measuring device |
EP0259494A1 (en) * | 1986-02-03 | 1988-03-16 | Matsushita Electric Industrial Co., Ltd. | Weight-detecting device |
US6006386A (en) * | 1995-11-16 | 1999-12-28 | International Road Dynamics Inc. | Capacitive transducer |
EP1068500A2 (en) * | 1998-03-30 | 2001-01-17 | C-Sensor Corporation | Linear force sensing device |
-
1973
- 1973-01-04 GB GB46673A patent/GB1453934A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0123646A2 (en) * | 1983-02-23 | 1984-10-31 | Christof W. Burckhardt | Capacitive force measuring device |
EP0123646A3 (en) * | 1983-02-23 | 1985-10-09 | Christof W. Burckhardt | Capacitive force measuring device |
US4552028A (en) * | 1983-02-23 | 1985-11-12 | Burckhardt Christof W | Device for measuring force |
AU568331B2 (en) * | 1983-02-23 | 1987-12-24 | Nitto Kohki Co., Ltd. | Device for measuring force |
EP0259494A1 (en) * | 1986-02-03 | 1988-03-16 | Matsushita Electric Industrial Co., Ltd. | Weight-detecting device |
EP0259494A4 (en) * | 1986-02-03 | 1989-12-19 | Matsushita Electric Ind Co Ltd | Weight-detecting device. |
US6006386A (en) * | 1995-11-16 | 1999-12-28 | International Road Dynamics Inc. | Capacitive transducer |
EP1068500A2 (en) * | 1998-03-30 | 2001-01-17 | C-Sensor Corporation | Linear force sensing device |
EP1068500A4 (en) * | 1998-03-30 | 2001-11-07 | Sensor Corp C | Linear force sensing device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |