GB2178541A - A weighing device - Google Patents

A weighing device Download PDF

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Publication number
GB2178541A
GB2178541A GB08615306A GB8615306A GB2178541A GB 2178541 A GB2178541 A GB 2178541A GB 08615306 A GB08615306 A GB 08615306A GB 8615306 A GB8615306 A GB 8615306A GB 2178541 A GB2178541 A GB 2178541A
Authority
GB
United Kingdom
Prior art keywords
piezo
electric
weighing device
opposite
weight
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
GB08615306A
Other versions
GB2178541B (en
GB8615306D0 (en
Inventor
Stan Benzies Hanssen
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.)
Tricolor Corp
Original Assignee
Tricolor Corp
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 Tricolor Corp filed Critical Tricolor Corp
Publication of GB8615306D0 publication Critical patent/GB8615306D0/en
Publication of GB2178541A publication Critical patent/GB2178541A/en
Application granted granted Critical
Publication of GB2178541B publication Critical patent/GB2178541B/en
Expired legal-status Critical Current

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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
    • G01G3/13—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 having piezoelectric or piezoresistive properties

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

A weighing device 1 comprises a part 2 which is deflectable by an applied weight and a piezo-electric device 3 for converting deflection of the part 2 into an electric current for powering a visual display (not shown) of applied weight, the piezo-electric device including two piezo-electric elements 4 and 5 which are each mounted in the form of a cantilever with the lever movement of one 4 being opposite the lever movement of the other 5, whereby variations in electrical output owing to ambient conditions are compensated. Thus the weighing device 1 provides accurate weighings and thus visual display at all times. <IMAGE>

Description

SPECIFICATION A weighing device The invention relates to a weighing device.
According to the invention there is provided a weighing device, comprising a part which is deflectable by an applied weight and a piezoelectric device for converting deflection of the part into an electric current for powering a visual display of applied weight, the piezoelectric device including two piezo-elements which are each mounted in the form of a cantilever with the lever movement of one being opposite the lever movement of the other, whereby variations in electrical output owing to ambient conditions are compensated.
The part may comprise a weight-receiving platform supported by a lever system which has a knife-edge bearing on one of the piezoelectric elements.
The part may alternatively comprise a weight-receiving platform and substantially parallel reciprocable arms supporting the platform which include a knife-edge bearing on one of the piezo-electric elements.
The two piezo-electric elements may be elongate and mounted substantially in parallel.
The one piezo-electric element may be mounted adjacent an end of the other piezoelectric element opposite the end of the second element from which the second element is cantilevered.
The other piezo-electric element may be secured in a block at one end and the one piezo-electric element may be secured to and supported by the other piezo-electric element at an end opposite the other end.
Weighing devices embodying the invention are hereinafter described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a schematic view of part of a weighing device according to the invention in the form of a personal weighing scale; and Figure 2 is a schematic view of part of a weighing device according to the invention in the form of a kitchen scale.
Referring to the drawings, in which like parts are referred to by like numerals, a weighing device 1 comprises a part 2 which is deflectable by an applied weight and a piezo-electric device 3 for converting deflection of part into an electric current for powering a visual display (not shown) of applied weight, the piezo-electric device including two piezo-electric elements 4 and 5 which are each mounted in the form of a cantilever with the lever movement of one 4 being opposite the lever movement of the other 5, whereby variations in electrical output owing to ambient conditions are compensated. Thus the weighing device 1 provides accurate weighings and thus visual display at all times.
The two piezo-electric elements 4 and 5 are elongate, in the form of rectangular bars with the one 4 being supported adjacent one 6 and at and over (as viewed) a free end 7 of the other element 5 by a nut and bolt arrangement 8, the other element 5 being cantilevered from a block 9 on the base 10 of the weighing device. The two piezo-electric elements 4 and 5 are mounted substantially in parallel, one above the other.
In Fig. 1 the device is a personal weighing device like a platform or bathroom scale which has a weight-receiving platform supported on a lever system which includes a knife-edge 11 bearing on the element 4 adjacent the free end 12 thereof opposite the end 6 from which it is cantilever mounted on the other element 5.
In Fig. 2, the weight device is a kitchen-type scale which has a body 13 which is reciprocable on parallel levers 14 reciprocable in a guide 15, the body 13 having a part 16 receiving a tray and a knife-edge 11 again bearing adjacent the free end 12 of the one piezoelectric element, the opposite end of which is cantilevered from the free end 7 of the other piezo-electric element 5 which is itself cantilevered from a block 9 fixed to the base 10 of the device 1.
The piezo-electric device 2 is connected by three wires to a suitable circuit including a visual read-out like an LED, the circuit including a suitable chip and powered by suitable means such a a 9-volt-battery. The weighing device 1 of Fig. 1 includes a switch connectible to a zeroing device so that the weighing device is accurate when operated on a carpet.
In use, the oppositely-cantilevered elements 4 and 5 compensate for fluctuations in ambient conditions so that opposite fluctuations of piezo-current are in use cancelled out and a true direct reading of applied weight is achieved.
In every embodiment, the scales include a weighing device or system using a guided cantilever beam with two sensors one acting in compression and one in tension.
1. A weighing device, comprising a part which is deflectable by an applied weight and a piezo-electric device for converting deflection of the part into an electric current for powering a visual display of applied weight, the piezo-electric device including two piezo-elements which are each mounted in the form of a cantilever with the lever movement of one being opposite the lever movement of the other, whereby variations in electrical output owing to ambient conditions are compensated.
2. A device according to Claim 1, the part comprising a weight-receiving platform supported by a lever system which has a knifeedge bearing on one of the piezo-electric elements.
3. A device according to Claim 1, the part
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (9)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A weighing device The invention relates to a weighing device. According to the invention there is provided a weighing device, comprising a part which is deflectable by an applied weight and a piezoelectric device for converting deflection of the part into an electric current for powering a visual display of applied weight, the piezoelectric device including two piezo-elements which are each mounted in the form of a cantilever with the lever movement of one being opposite the lever movement of the other, whereby variations in electrical output owing to ambient conditions are compensated. The part may comprise a weight-receiving platform supported by a lever system which has a knife-edge bearing on one of the piezoelectric elements. The part may alternatively comprise a weight-receiving platform and substantially parallel reciprocable arms supporting the platform which include a knife-edge bearing on one of the piezo-electric elements. The two piezo-electric elements may be elongate and mounted substantially in parallel. The one piezo-electric element may be mounted adjacent an end of the other piezoelectric element opposite the end of the second element from which the second element is cantilevered. The other piezo-electric element may be secured in a block at one end and the one piezo-electric element may be secured to and supported by the other piezo-electric element at an end opposite the other end. Weighing devices embodying the invention are hereinafter described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a schematic view of part of a weighing device according to the invention in the form of a personal weighing scale; and Figure 2 is a schematic view of part of a weighing device according to the invention in the form of a kitchen scale. Referring to the drawings, in which like parts are referred to by like numerals, a weighing device 1 comprises a part 2 which is deflectable by an applied weight and a piezo-electric device 3 for converting deflection of part into an electric current for powering a visual display (not shown) of applied weight, the piezo-electric device including two piezo-electric elements 4 and 5 which are each mounted in the form of a cantilever with the lever movement of one 4 being opposite the lever movement of the other 5, whereby variations in electrical output owing to ambient conditions are compensated. Thus the weighing device 1 provides accurate weighings and thus visual display at all times. The two piezo-electric elements 4 and 5 are elongate, in the form of rectangular bars with the one 4 being supported adjacent one 6 and at and over (as viewed) a free end 7 of the other element 5 by a nut and bolt arrangement 8, the other element 5 being cantilevered from a block 9 on the base 10 of the weighing device. The two piezo-electric elements 4 and 5 are mounted substantially in parallel, one above the other. In Fig. 1 the device is a personal weighing device like a platform or bathroom scale which has a weight-receiving platform supported on a lever system which includes a knife-edge 11 bearing on the element 4 adjacent the free end 12 thereof opposite the end 6 from which it is cantilever mounted on the other element 5. In Fig. 2, the weight device is a kitchen-type scale which has a body 13 which is reciprocable on parallel levers 14 reciprocable in a guide 15, the body 13 having a part 16 receiving a tray and a knife-edge 11 again bearing adjacent the free end 12 of the one piezoelectric element, the opposite end of which is cantilevered from the free end 7 of the other piezo-electric element 5 which is itself cantilevered from a block 9 fixed to the base 10 of the device 1. The piezo-electric device 2 is connected by three wires to a suitable circuit including a visual read-out like an LED, the circuit including a suitable chip and powered by suitable means such a a 9-volt-battery. The weighing device 1 of Fig. 1 includes a switch connectible to a zeroing device so that the weighing device is accurate when operated on a carpet. In use, the oppositely-cantilevered elements 4 and 5 compensate for fluctuations in ambient conditions so that opposite fluctuations of piezo-current are in use cancelled out and a true direct reading of applied weight is achieved. In every embodiment, the scales include a weighing device or system using a guided cantilever beam with two sensors one acting in compression and one in tension. CLAIMS
1. A weighing device, comprising a part which is deflectable by an applied weight and a piezo-electric device for converting deflection of the part into an electric current for powering a visual display of applied weight, the piezo-electric device including two piezo-elements which are each mounted in the form of a cantilever with the lever movement of one being opposite the lever movement of the other, whereby variations in electrical output owing to ambient conditions are compensated.
2. A device according to Claim 1, the part comprising a weight-receiving platform supported by a lever system which has a knifeedge bearing on one of the piezo-electric elements.
3. A device according to Claim 1, the part comprising a weight-receiving platform and substantially parallel reciprocable arms supporting the platform which include a knifeedge bearing on one of the piezo-electric elements.
4. A device according to any preceding Claim, the two piezo-electric elements being elongate and mounted substantially in parallel.
5. A device according to Claim 4, the one piezo-electric element being mounted adjacent an end of the other piezo-electric element opposite the end of the second element from which the second element is cantilevered.
6. A device according to Claim 5, the other piezo-electric element being secured in a block at one end and the piezo-electric element being secured to and supported by the other piezo-electric element at an end opposite the other end.
7. A weighing device according to any preceding Claim, comprising a personal weighing scale.
8. A weighing device according to any of Claims 1-6, comprising a kitchen scale.
9. A weighing device, substantially as hereinbefore described with reference to the accompanying drawings.
GB8615306A 1985-06-24 1986-06-23 A weighing device Expired GB2178541B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB858515905A GB8515905D0 (en) 1985-06-24 1985-06-24 Weighing device

Publications (3)

Publication Number Publication Date
GB8615306D0 GB8615306D0 (en) 1986-07-30
GB2178541A true GB2178541A (en) 1987-02-11
GB2178541B GB2178541B (en) 1989-07-12

Family

ID=10581225

Family Applications (2)

Application Number Title Priority Date Filing Date
GB858515905A Pending GB8515905D0 (en) 1985-06-24 1985-06-24 Weighing device
GB8615306A Expired GB2178541B (en) 1985-06-24 1986-06-23 A weighing device

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB858515905A Pending GB8515905D0 (en) 1985-06-24 1985-06-24 Weighing device

Country Status (2)

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GB (2) GB8515905D0 (en)
HK (1) HK9290A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2184550A (en) * 1984-11-27 1987-06-24 Sharp Kk Weight measuring device for microwave oven

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB882989A (en) * 1959-02-20 1961-11-22 Schenck Gmbh Carl Device for measuring forces
GB1196305A (en) * 1966-10-17 1970-06-24 Blh Electronics Strain Gage Transducer Structures
GB1237453A (en) * 1967-07-07 1971-06-30 Merestechnikai Kozponti An electromechanical transducer
GB1432391A (en) * 1972-07-03 1976-04-14 English D C Mccauley J L Load cell
GB1506701A (en) * 1973-12-06 1978-04-12 Scotus Marine Ltd Pressure sensing device
GB1530796A (en) * 1976-05-13 1978-11-01 Avery Ltd W Force transducers
GB1534276A (en) * 1976-02-02 1978-11-29 Emi Ltd Force transducers
GB2007844A (en) * 1977-11-10 1979-05-23 Goodwood Data Systems Ltd Diesel fuel pipe transducer
GB2043906A (en) * 1979-02-24 1980-10-08 Avery Ltd W & T Force transducers

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB882989A (en) * 1959-02-20 1961-11-22 Schenck Gmbh Carl Device for measuring forces
GB1196305A (en) * 1966-10-17 1970-06-24 Blh Electronics Strain Gage Transducer Structures
GB1237453A (en) * 1967-07-07 1971-06-30 Merestechnikai Kozponti An electromechanical transducer
GB1432391A (en) * 1972-07-03 1976-04-14 English D C Mccauley J L Load cell
GB1506701A (en) * 1973-12-06 1978-04-12 Scotus Marine Ltd Pressure sensing device
GB1534276A (en) * 1976-02-02 1978-11-29 Emi Ltd Force transducers
GB1530796A (en) * 1976-05-13 1978-11-01 Avery Ltd W Force transducers
GB2007844A (en) * 1977-11-10 1979-05-23 Goodwood Data Systems Ltd Diesel fuel pipe transducer
GB2043906A (en) * 1979-02-24 1980-10-08 Avery Ltd W & T Force transducers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2184550A (en) * 1984-11-27 1987-06-24 Sharp Kk Weight measuring device for microwave oven
GB2184550B (en) * 1984-11-27 1989-08-23 Sharp Kk Weighing apparatus

Also Published As

Publication number Publication date
GB2178541B (en) 1989-07-12
GB8515905D0 (en) 1985-07-24
GB8615306D0 (en) 1986-07-30
HK9290A (en) 1990-02-16

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930623