WO1997036154A1 - Weighing device and method - Google Patents
Weighing device and method Download PDFInfo
- Publication number
- WO1997036154A1 WO1997036154A1 PCT/IL1997/000109 IL9700109W WO9736154A1 WO 1997036154 A1 WO1997036154 A1 WO 1997036154A1 IL 9700109 W IL9700109 W IL 9700109W WO 9736154 A1 WO9736154 A1 WO 9736154A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- displacement
- frame
- load
- measurement
- point
- Prior art date
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
Definitions
- weight measurement device is based on use of a hydraulic load cell, such as disclosed in US
- a weighing device comprising : a rigid frame for supporting a load positioned thereon; a plurality of spring elements for flexibly supporting said frame against a displacement thereof due to said load; means for measuring said frame displacement at a point invariant of said load distribution on said supporting frame , said frame displacement at said point being convertible to provide a weight measurement of said load.
- a passive weight measurement sensor can be provided which does not develop force against the load, such that the load supporting surface displacement provides the weight measurement.
- a weight measurement scale can be constructed which is accurate, small, light, strong and precise, and can be manufactured at low cost.
- Figs. 1a-c are schematic illustrations of a weight W arranged at various positions on a load supporting surface ;
- Fig. 3 is a perspective view of the load supporting surface of Fig. 2 which defines an equivalent loading point for measuring its displacement under a load;
- Fig. 4 is a schematic illustration of a modified load supporting surface arranged with a plurality of spring elements
- Fig. 5 shows a rigid frame supported by spring elements
- Fig. 7 is a schematic diagram of a measurement sensor
- Figs. 8a-b show a volume displacement sensor
- Figs. 9a-b show an alternative volume displacement sensor.
- FIGs. 1a-c there are shown schematic illustrations of a load W arranged at various positions on a load supporting surface 10.
- the invention relates to measurement of the weight of load W by use of a scale in which load supporting surface 10 is depressed against a set of springs, each having a known spring constant.
- load supporting surface 10 is flexibly supported by a pair of springs S1 , S2 having equal spring constants.
- the point at which the displacement of surface 10 is independent of the load W position is called the origin.
- the origin For the arrangement shown in Fig. 2 having a multiplicity of springs Si, it can be proven that in general, with respect to the origin, the sum of the spring constants multiplied by the distance from the origin is equal to zero.
- the invention is based on the principle that, for a pair of surfaces separated by a multiplicity of springs or elastic elements, there exists a point at which the displacement between the surfaces is independent of the position of the load. Thus, at this point, defined as the origin, measurement of the displacement alone is constant with regard to a given load.
- each displacement di of the upper spring ends will then satisfy the equations of equilibrium for compression forces and moments as follows: ⁇ Kidl W (3) and
- load supporting surface 10 is parallel to the lower one when unloaded.
- all the springs have the same initial length.
- surface 10 shifts parallel to itself only in the case of a load applied at the origin. In other cases, the equilibrium position of the load supporting surface 10 is not parallel to the lower one.
- Coefficients a and b depend on the load W and the point of application, while coefficient c depends on W only.
- Fig. 3 there is illustrated a perspective view of load supporting surface 10 of Fig. 2, with a plurality of springs, in which the origin defines an equivalent loading point 14 for measuring displacement under a load.
- load W is not placed directly over the origin, and the displacement of load supporting surface 10 is measured at point 14.
- the displacement is used to provide the weight measurement in accordance with equation (11), such that if the displacement at the origin is d , the weight is:
- a modified load supporting surface 16 arranged with a plurality of spring elements Si.
- the modified load supporting surface is formed with projections 18 forming an irregular, non-smooth underside.
- the spring elements are connected at their upper ends to each of projections 18, thus, each has a different height. Since surface 16 is rigid, when it is displaced under a load W, projections 18 are also displaced, and the upper ends of spring elements are displaced by dn, d1 and d2.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97907260A EP0890083A4 (en) | 1996-03-26 | 1997-03-26 | Weighing device and method |
AU19384/97A AU1938497A (en) | 1996-03-26 | 1997-03-26 | Weighing device and method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL117658 | 1996-03-26 | ||
IL11765896A IL117658A0 (en) | 1996-03-26 | 1996-03-26 | Weighing device and method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997036154A1 true WO1997036154A1 (en) | 1997-10-02 |
Family
ID=11068701
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IL1997/000109 WO1997036154A1 (en) | 1996-03-26 | 1997-03-26 | Weighing device and method |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0890083A4 (en) |
AU (1) | AU1938497A (en) |
IL (1) | IL117658A0 (en) |
WO (1) | WO1997036154A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008029901A1 (en) * | 2008-06-24 | 2010-02-25 | Ika-Werke Gmbh & Co. Kg | Magnetic stirrer with support feet |
DE102008029900A1 (en) * | 2008-06-24 | 2010-02-25 | Ika-Werke Gmbh & Co. Kg | Laboratory reactor with a reaction vessel |
WO2018187886A1 (en) * | 2017-04-09 | 2018-10-18 | 深圳市翼动科技有限公司 | Easy-to-adjust electronic scale |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3968850A (en) * | 1974-10-31 | 1976-07-13 | International Electronics Limited | Electromagnet weighing balance |
US4002216A (en) * | 1975-09-24 | 1977-01-11 | Benjamin Solow | Portable scale |
US4007800A (en) * | 1974-07-17 | 1977-02-15 | Haenni & Cie Aktiengesellschaft | Force measuring device |
US4067408A (en) * | 1976-11-26 | 1978-01-10 | Knight L. Harris | Balance mechanism |
US4184555A (en) * | 1977-07-21 | 1980-01-22 | Maltby Robert C | Weighing apparatus |
US4917197A (en) * | 1989-02-10 | 1990-04-17 | Blodgett & Blodgett, P.C. | Weighing system for vehicles |
US5234065A (en) * | 1992-11-23 | 1993-08-10 | Schmidt Karl B | Portable weight measuring device |
US5430275A (en) * | 1993-01-29 | 1995-07-04 | Whirlpool Europe B.V. | Microwave oven with turntable and weight sensor |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4438823A (en) * | 1982-08-09 | 1984-03-27 | Dbi Industries, Inc. | Load cell |
-
1996
- 1996-03-26 IL IL11765896A patent/IL117658A0/en unknown
-
1997
- 1997-03-26 AU AU19384/97A patent/AU1938497A/en not_active Abandoned
- 1997-03-26 EP EP97907260A patent/EP0890083A4/en not_active Withdrawn
- 1997-03-26 WO PCT/IL1997/000109 patent/WO1997036154A1/en not_active Application Discontinuation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4007800A (en) * | 1974-07-17 | 1977-02-15 | Haenni & Cie Aktiengesellschaft | Force measuring device |
US3968850A (en) * | 1974-10-31 | 1976-07-13 | International Electronics Limited | Electromagnet weighing balance |
US4002216A (en) * | 1975-09-24 | 1977-01-11 | Benjamin Solow | Portable scale |
US4067408A (en) * | 1976-11-26 | 1978-01-10 | Knight L. Harris | Balance mechanism |
US4184555A (en) * | 1977-07-21 | 1980-01-22 | Maltby Robert C | Weighing apparatus |
US4917197A (en) * | 1989-02-10 | 1990-04-17 | Blodgett & Blodgett, P.C. | Weighing system for vehicles |
US5234065A (en) * | 1992-11-23 | 1993-08-10 | Schmidt Karl B | Portable weight measuring device |
US5430275A (en) * | 1993-01-29 | 1995-07-04 | Whirlpool Europe B.V. | Microwave oven with turntable and weight sensor |
Non-Patent Citations (1)
Title |
---|
See also references of EP0890083A4 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008029901A1 (en) * | 2008-06-24 | 2010-02-25 | Ika-Werke Gmbh & Co. Kg | Magnetic stirrer with support feet |
DE102008029900A1 (en) * | 2008-06-24 | 2010-02-25 | Ika-Werke Gmbh & Co. Kg | Laboratory reactor with a reaction vessel |
DE102008029900B4 (en) * | 2008-06-24 | 2010-10-14 | Ika-Werke Gmbh & Co. Kg | Laboratory reactor with a reaction vessel |
DE102008029901B4 (en) * | 2008-06-24 | 2010-10-28 | Ika-Werke Gmbh & Co. Kg | Magnetic stirrer with support feet |
WO2018187886A1 (en) * | 2017-04-09 | 2018-10-18 | 深圳市翼动科技有限公司 | Easy-to-adjust electronic scale |
Also Published As
Publication number | Publication date |
---|---|
AU1938497A (en) | 1997-10-17 |
EP0890083A4 (en) | 2000-03-22 |
IL117658A0 (en) | 1996-07-23 |
EP0890083A1 (en) | 1999-01-13 |
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