GB1088873A - Improvements in or relating to weighing apparatus - Google Patents
Improvements in or relating to weighing apparatusInfo
- Publication number
- GB1088873A GB1088873A GB541065A GB541065A GB1088873A GB 1088873 A GB1088873 A GB 1088873A GB 541065 A GB541065 A GB 541065A GB 541065 A GB541065 A GB 541065A GB 1088873 A GB1088873 A GB 1088873A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- load
- platform
- electrodes
- amplifier
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/08—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a leaf spring
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
1,088,873. Measuring weight, electrically. WAYNE KERR LABORATORIES Ltd. and R. CALVERT. May 9, 1966 [Feb.8, 1965], No. 5410/65. Heading G1N. A weighing apparatus comprises a load platform supported resiliently at a plurality of points on capacitive load cells (Fig. 2) each connected in the feedback circuit of an A. C. energized amplifier, Fig. 5 (not shown) whereby the output voltage of each amplifier is directly proportional to the displacement of the electrodes of its associated capacitive load cell and hence to the load thereon, the voltage across a load cell being indirectly proportional to the electrode spacing. The amplifier output voltages are summed to provide a measure of the total load on the platform. Each load cell comprises a resilient proving ring 11 (Fig. 2) on a base 13 and having a domed top 14 on which the platform rests, a circular disc electrode 16 electrically and mechanically joined to the ring by a support 15, and conveniently at earth potential. Co-operating with electrode 16 is a circular disc electrode 17 surrounded by a guard ring or neutral electrode 18, electrodes 17, 18 being supported on a stationary coaxial connector having an inner conductor 19 connected to electrode 17 and an outer conductor 20 connected to the guard ring electrode 18. The connector is electrically connected by a coaxial cable 21 to the input of an associated amplifier. The electrodes 16, 17 are arranged so that they remain spaced apart under maximum deflection of the proving ring under load. Stops are provided (not shown) to prevent the electrodes contacting one another if the platform is overloaded. In an alternative embodiment Fig. 4 (not shown) the platform is supported at each corner on the top of a block (21) carried by a pair of leaf springs (22) (23), the undersurface of each block constituting a movable electrode of a capacitive transducer similar to that in Fig. 2. Spaced separated load carriers may be used, for example when measuring the weight of a wheeled vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB541065A GB1088873A (en) | 1965-02-08 | 1965-02-08 | Improvements in or relating to weighing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB541065A GB1088873A (en) | 1965-02-08 | 1965-02-08 | Improvements in or relating to weighing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1088873A true GB1088873A (en) | 1967-10-25 |
Family
ID=9795663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB541065A Expired GB1088873A (en) | 1965-02-08 | 1965-02-08 | Improvements in or relating to weighing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1088873A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3575248A (en) * | 1969-04-14 | 1971-04-20 | Westinghouse Air Brake Co | Weighing device |
| US4191268A (en) * | 1977-02-22 | 1980-03-04 | Tanita Corporation | Digital weighing machine |
| EP0017581A1 (en) * | 1979-04-02 | 1980-10-15 | Testut-Aequitas | One-piece parallelogram-shaped load receiver, with capacitive transducer |
| US4273204A (en) * | 1978-05-30 | 1981-06-16 | The Jade Corporation | Capacitive force load cell for weighing scale |
| EP0103360A2 (en) * | 1982-06-22 | 1984-03-21 | Peter Caleb Frederick Wolfendale | Capacitive load cell |
| EP0029776B1 (en) * | 1979-11-16 | 1984-07-18 | Testut-Aequitas | Parallel beam scales with a parallelogram of unitary construction |
-
1965
- 1965-02-08 GB GB541065A patent/GB1088873A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3575248A (en) * | 1969-04-14 | 1971-04-20 | Westinghouse Air Brake Co | Weighing device |
| US4191268A (en) * | 1977-02-22 | 1980-03-04 | Tanita Corporation | Digital weighing machine |
| US4273204A (en) * | 1978-05-30 | 1981-06-16 | The Jade Corporation | Capacitive force load cell for weighing scale |
| EP0017581A1 (en) * | 1979-04-02 | 1980-10-15 | Testut-Aequitas | One-piece parallelogram-shaped load receiver, with capacitive transducer |
| EP0029776B1 (en) * | 1979-11-16 | 1984-07-18 | Testut-Aequitas | Parallel beam scales with a parallelogram of unitary construction |
| EP0103360A2 (en) * | 1982-06-22 | 1984-03-21 | Peter Caleb Frederick Wolfendale | Capacitive load cell |
| EP0103360A3 (en) * | 1982-06-22 | 1984-11-28 | Peter Caleb Frederick Wolfendale | Capacitive load cell compensated for unwanted effects |
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