GB2188738A - Load cell - Google Patents

Load cell Download PDF

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Publication number
GB2188738A
GB2188738A GB08608177A GB8608177A GB2188738A GB 2188738 A GB2188738 A GB 2188738A GB 08608177 A GB08608177 A GB 08608177A GB 8608177 A GB8608177 A GB 8608177A GB 2188738 A GB2188738 A GB 2188738A
Authority
GB
United Kingdom
Prior art keywords
support
load
deflection beam
base
load cell
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
GB08608177A
Other versions
GB2188738B (en
GB8608177D0 (en
Inventor
Peter David Glasspole
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.)
THAMES SIDE SCIENT Co LIM
Original Assignee
THAMES SIDE SCIENT Co LIM
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 THAMES SIDE SCIENT Co LIM filed Critical THAMES SIDE SCIENT Co LIM
Priority to GB8608177A priority Critical patent/GB2188738B/en
Publication of GB8608177D0 publication Critical patent/GB8608177D0/en
Publication of GB2188738A publication Critical patent/GB2188738A/en
Application granted granted Critical
Publication of GB2188738B publication Critical patent/GB2188738B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
    • G01G19/021—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles having electrical weight-sensitive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/23—Support or suspension of weighing platforms
    • 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
    • G01G3/14—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 electrical resistance
    • G01G3/1402—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01G3/141—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc or ring shaped

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Force In General (AREA)

Abstract

A load cell is disclosed comprising a base support (1), an opposed load support (2) and a substantially S-shaped deflection beam (3). The load support (2) and deflection beam (3) are suspended on the base support (1) by hoop members (11) extending around stub shafts (6, 10) so that the load support (2) can adjust relative to the base support (1). <IMAGE>

Description

SPECIFICATION Load cell This invention relates to load cells.
Load cells comprising a deflection beam and means for measuring deflections of the beam are used in weighing apparatus for weighing loads such as the contents of hoppers or tanks, or in weighbridges for weighing commercial vehicles and the like. Particularly with weighbridges where a vehicle to be weighed is driven on to a weighing platform, it is not uncommon for the load to be unevenly distributed on the weighing platform and this can lead to inaccurate readings.
It is the object of the present invention to provide a load cell which can be simple and robust in its construction, which can be relatively compact and which is capable of automatically adjusting to uneven loads.
The present invention provides a load cell comprising a base support, an opposed load support, a substantially S-shaped deflection beam, means for measuring deflections of the beam and means mounting said beam between the base support and the load support whereby said beam will be deflected when a sufficient load is applied to said load support in a given direction, said mounting means being such that said load support can adjust relative to said base support in a direction substantially normal to said given direction.
Said deflection beam may be pivotally connected to the load support. Thus the load support may comprise a support plate and a pair of spaced flanges depending from an underside of the support plate and the deflection beam may be pivotally connected to the load support by means of a pivot which is associated with the deflection beam and co-operates with said flanges.
The load support and the deflection beam may be suspended on the base support. Thus the base support may comprise a base plate and a pair of opposed walls upstanding from the base plate and the load support and the deflection beam may be suspended between said opposed walls. Said opposed walls may have opposed stub shafts extending inwardly therefrom and said deflection beam may have a pair of stub shafts extending outwardly on opposite sides thereof and a pair of hoop members may each extend around a stub shaft on one of said walls and one of the stub shafts on said deflection beam. Said stub shafts may have annular grooves therein to receive and locate said hoop members.
Said measuring means may, in conventional manner, comprise one or more strain sensors such as strain gauges electrically connected to means for translating the deflections of the deflection beam measured by the strain sensors into a readable measurement of weight.
The present invention further provides weighing apparatus, such as a weighbridge, comprising at least one load cell according to the present invention.
The present invention will be more psrticu- arly described with reference to the accompanying drawings in which Figure 1 is a front elevational view of a load call according to the present invention and, Figure 2 is a side elevation of the load cell of Fig. 1.
Referring to the drawings it will be seen that the load cell illustrated comprises a base support 1, an opposed load support 2 and a substantially S-shaped deflection beam 3. The base support 1 comprises a base plate 4 and a pair of opposed side walls 5 extending upwardly from the base plate 4. Opposed stub shafts 6 extend inwardly from each of the side walls 5.
The load support 2 comprises a support plate 7 and a pair of spaced flanges 8 which depend from the underside of the support plate 7. The deflection beam 3 is pivotally connected to the load support 2 by means of a pivot pin 9 which extends through the flanges 8 and through the deflection beam 3.
The deflection beam 3 has a stub shaft 10 extending outwardly on opposite sides thereof. The load support 2 and the deflection beam 3 are suspended between the walls 5 of the base support 1 by metal hoop members 11 each of which extends around one of the stub shafts 6 and one of the stub shafts 10 as shown. The stub shafts 6 and 10 each have an annular groove 12 therein for receiving and locating the hoop members 11.
The deflection beam 3 is of a known kind and is of a generally disc-iike form having slots 13 extending thereinto from opposite sides thereof which give it its substantial Sshape. A central area 14 of reduced thickness of the deflection beam 3 contains one or more strain gauges (not shown) for measuring the deflections of the beam 3.
It will readily be appreciated that since the deflection beam 3 is pivotally connected to the load support 2 and since the load support 2 and deflection beam 3 are suspended between the walls 5 of the base support 1 by means of the hoop members 11, the load support 2 can adjust relative to the base support 1 substantially in the plane of the support
claim 7.
CLAIMS 1. A load cell comprising a base support, an opposed load support, a substantially Sshaped deflection beam, means for measuring deflections of the beam and means mounting said beam between the base support and the load support whereby said beam will be defiected when a sufficient load is applied to said load support in a given direction, said mounting means being such that said load support can adjust relative to said base sup
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Load cell This invention relates to load cells. Load cells comprising a deflection beam and means for measuring deflections of the beam are used in weighing apparatus for weighing loads such as the contents of hoppers or tanks, or in weighbridges for weighing commercial vehicles and the like. Particularly with weighbridges where a vehicle to be weighed is driven on to a weighing platform, it is not uncommon for the load to be unevenly distributed on the weighing platform and this can lead to inaccurate readings. It is the object of the present invention to provide a load cell which can be simple and robust in its construction, which can be relatively compact and which is capable of automatically adjusting to uneven loads. The present invention provides a load cell comprising a base support, an opposed load support, a substantially S-shaped deflection beam, means for measuring deflections of the beam and means mounting said beam between the base support and the load support whereby said beam will be deflected when a sufficient load is applied to said load support in a given direction, said mounting means being such that said load support can adjust relative to said base support in a direction substantially normal to said given direction. Said deflection beam may be pivotally connected to the load support. Thus the load support may comprise a support plate and a pair of spaced flanges depending from an underside of the support plate and the deflection beam may be pivotally connected to the load support by means of a pivot which is associated with the deflection beam and co-operates with said flanges. The load support and the deflection beam may be suspended on the base support. Thus the base support may comprise a base plate and a pair of opposed walls upstanding from the base plate and the load support and the deflection beam may be suspended between said opposed walls. Said opposed walls may have opposed stub shafts extending inwardly therefrom and said deflection beam may have a pair of stub shafts extending outwardly on opposite sides thereof and a pair of hoop members may each extend around a stub shaft on one of said walls and one of the stub shafts on said deflection beam. Said stub shafts may have annular grooves therein to receive and locate said hoop members. Said measuring means may, in conventional manner, comprise one or more strain sensors such as strain gauges electrically connected to means for translating the deflections of the deflection beam measured by the strain sensors into a readable measurement of weight. The present invention further provides weighing apparatus, such as a weighbridge, comprising at least one load cell according to the present invention. The present invention will be more psrticu- arly described with reference to the accompanying drawings in which Figure 1 is a front elevational view of a load call according to the present invention and, Figure 2 is a side elevation of the load cell of Fig. 1. Referring to the drawings it will be seen that the load cell illustrated comprises a base support 1, an opposed load support 2 and a substantially S-shaped deflection beam 3. The base support 1 comprises a base plate 4 and a pair of opposed side walls 5 extending upwardly from the base plate 4. Opposed stub shafts 6 extend inwardly from each of the side walls 5. The load support 2 comprises a support plate 7 and a pair of spaced flanges 8 which depend from the underside of the support plate 7. The deflection beam 3 is pivotally connected to the load support 2 by means of a pivot pin 9 which extends through the flanges 8 and through the deflection beam 3. The deflection beam 3 has a stub shaft 10 extending outwardly on opposite sides thereof. The load support 2 and the deflection beam 3 are suspended between the walls 5 of the base support 1 by metal hoop members 11 each of which extends around one of the stub shafts 6 and one of the stub shafts 10 as shown. The stub shafts 6 and 10 each have an annular groove 12 therein for receiving and locating the hoop members 11. The deflection beam 3 is of a known kind and is of a generally disc-iike form having slots 13 extending thereinto from opposite sides thereof which give it its substantial Sshape. A central area 14 of reduced thickness of the deflection beam 3 contains one or more strain gauges (not shown) for measuring the deflections of the beam 3. It will readily be appreciated that since the deflection beam 3 is pivotally connected to the load support 2 and since the load support 2 and deflection beam 3 are suspended between the walls 5 of the base support 1 by means of the hoop members 11, the load support 2 can adjust relative to the base support 1 substantially in the plane of the support claim 7. CLAIMS
1. A load cell comprising a base support, an opposed load support, a substantially Sshaped deflection beam, means for measuring deflections of the beam and means mounting said beam between the base support and the load support whereby said beam will be defiected when a sufficient load is applied to said load support in a given direction, said mounting means being such that said load support can adjust relative to said base sup port in a direction substantially normal to said given direction.
2. A load cell according to claim 1, wherein said deflection beam is pivotally connected to the load support.
3. A load cell according to claim 2, wherein the load support comprises a support plate and a pair of spaced flanges depending from an underside of the support plate and wherein the deflection beam is pivotally connected to the load support by means of a pivot which is associated with the deflection beam and co-operates with said flanges.
4. A load cell according to claim 1, 2 or 3, wherein said load support and said deflection beam are suspended on the base support.
5. A load cell according to claim 4, wherein the base support comprises a base plate and a pair of opposed walls upstanding from the base plate, the load support and the deflection beam being suspended between said opposed walls.
6. A load cell according to claim 5, wherein said opposed walls have opposed stub shafts extending inwardly therefrom, said deflection beam has a pair of stub shafts extending outwardly on opposite sides thereof, and wherein a pair of hoop members each extend around a stub shaft on one of said walls and one of the stub shafts on said deflection beam.
7. A load cell according to claim 6, wherein said stub shafts each have an annular groove therein for receiving and locating a said hoop member.
8. A load cell according to any one of the preceding claims, wherein said measuring means comprises one or more strain sensors.
9. A load cell substantially as herein described with reference to the accompanying drawings.
10. Weighing apparatus comprising at least one load cell according to any one of the preceding claims.
GB8608177A 1986-04-03 1986-04-03 Load cell Expired - Fee Related GB2188738B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8608177A GB2188738B (en) 1986-04-03 1986-04-03 Load cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8608177A GB2188738B (en) 1986-04-03 1986-04-03 Load cell

Publications (3)

Publication Number Publication Date
GB8608177D0 GB8608177D0 (en) 1986-05-08
GB2188738A true GB2188738A (en) 1987-10-07
GB2188738B GB2188738B (en) 1990-02-14

Family

ID=10595627

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8608177A Expired - Fee Related GB2188738B (en) 1986-04-03 1986-04-03 Load cell

Country Status (1)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675899A1 (en) * 1991-04-23 1992-10-30 Support Systems International Weighing apparatus, preferably mobile weighing apparatus, comprising scales with articulated linkage between framework and moving weighing plate, and application to the weighing of patients
CN103557913A (en) * 2013-11-08 2014-02-05 丹阳市利康机械有限公司 Weighing sensing module
CN103557914A (en) * 2013-11-08 2014-02-05 丹阳市利康机械有限公司 Pressure weighing sensor
WO2015117197A1 (en) * 2014-02-10 2015-08-13 Rinstrum Pty Ltd Weighing system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1085319A (en) * 1963-12-26 1967-09-27 Drafto Corp Improvements in or relating to folded spring assemblies
US3734217A (en) * 1970-09-21 1973-05-22 Trankon Ab Weighing device
US3797593A (en) * 1972-12-14 1974-03-19 Dudley & Conley Scale Co Inc Heavy duty industrial scale
GB1350775A (en) * 1970-05-05 1974-04-24 Safelink Ab Load measuring system and a device arranged for transmitting loads to load cells
GB1555934A (en) * 1976-03-15 1979-11-14 Gardner Denver Co Weight determining apparatus
US4506557A (en) * 1983-03-24 1985-03-26 Revere Corporation Of America Load cell apparatus
US4549622A (en) * 1983-06-20 1985-10-29 Superior Scale Co. Ltd. Heavy duty weigh scale

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558600A (en) * 1982-03-18 1985-12-17 Setra Systems, Inc. Force transducer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1085319A (en) * 1963-12-26 1967-09-27 Drafto Corp Improvements in or relating to folded spring assemblies
GB1350775A (en) * 1970-05-05 1974-04-24 Safelink Ab Load measuring system and a device arranged for transmitting loads to load cells
US3734217A (en) * 1970-09-21 1973-05-22 Trankon Ab Weighing device
US3797593A (en) * 1972-12-14 1974-03-19 Dudley & Conley Scale Co Inc Heavy duty industrial scale
GB1555934A (en) * 1976-03-15 1979-11-14 Gardner Denver Co Weight determining apparatus
US4506557A (en) * 1983-03-24 1985-03-26 Revere Corporation Of America Load cell apparatus
US4549622A (en) * 1983-06-20 1985-10-29 Superior Scale Co. Ltd. Heavy duty weigh scale

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675899A1 (en) * 1991-04-23 1992-10-30 Support Systems International Weighing apparatus, preferably mobile weighing apparatus, comprising scales with articulated linkage between framework and moving weighing plate, and application to the weighing of patients
CN103557913A (en) * 2013-11-08 2014-02-05 丹阳市利康机械有限公司 Weighing sensing module
CN103557914A (en) * 2013-11-08 2014-02-05 丹阳市利康机械有限公司 Pressure weighing sensor
WO2015117197A1 (en) * 2014-02-10 2015-08-13 Rinstrum Pty Ltd Weighing system

Also Published As

Publication number Publication date
GB2188738B (en) 1990-02-14
GB8608177D0 (en) 1986-05-08

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Legal Events

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

Effective date: 19940403