CA1101001A - Weighing apparatus - Google Patents
Weighing apparatusInfo
- Publication number
- CA1101001A CA1101001A CA307,611A CA307611A CA1101001A CA 1101001 A CA1101001 A CA 1101001A CA 307611 A CA307611 A CA 307611A CA 1101001 A CA1101001 A CA 1101001A
- Authority
- CA
- Canada
- Prior art keywords
- cavity
- plate
- weighing apparatus
- weighing
- bars
- 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
- G01G5/00—Weighing apparatus wherein the balancing is effected by fluid action
- G01G5/04—Weighing apparatus wherein the balancing is effected by fluid action with means for measuring the pressure imposed by the load on a liquid
-
- 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
- G01G19/025—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles wheel-load scales
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
- Sampling And Sample Adjustment (AREA)
- Handcart (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A weighing apparatus, particularly a portable apparatus for weighing vehicles, comprising a resilient body formed of an elastomeric material in which is formed a closed cavity containing a liquid, said cavity being connected by a conduit to an indicator for indicating changes in volume of the cavity when the body suffers changes due to compression forces applied thereto by the member being weighted, said body having a resilient metal plate fixed to an upper surface thereof, a resilient metal load support plate mounted on the plate and a further resilient metal plate embedded in the body and spaced below the plate and to which reaction forces are applied during weighing.
A weighing apparatus, particularly a portable apparatus for weighing vehicles, comprising a resilient body formed of an elastomeric material in which is formed a closed cavity containing a liquid, said cavity being connected by a conduit to an indicator for indicating changes in volume of the cavity when the body suffers changes due to compression forces applied thereto by the member being weighted, said body having a resilient metal plate fixed to an upper surface thereof, a resilient metal load support plate mounted on the plate and a further resilient metal plate embedded in the body and spaced below the plate and to which reaction forces are applied during weighing.
Description
This invention rela~ea to a weighing apparatue and particularly, but not exclu~ively, to a portable weighing apparatu~ ~or weighing vehioles.
Portable weighin~ device~ are known which can be placed under a wheel or wheels o~ a vehicle in order to measure individu~l. wheel or axle loadin8~ but such known devices gener~lly utilize ~ompli¢ated load cell~ whioh are prone to failure, the devices are heavy and therefore not readily portable in the ~ense that they cannot eaeily be lifted and moved manually, and they are expensive to manuacture.
A mechanical load cell is known from ~.~. Specification I~o.
1~74316 which i~ used for determining the compression forces developed in mine supports, the call comprising a eolid body of compreesible synthetic plastice material having an internal cavity filled with gae or liquid connected to an external indicator for indicating change~ in pre6sure in the cavity when the body 6u~fers changes in volume due to compreseion load, the body having secured thereto end pre~6ure plate~
Portable weighin~ device~ are known which can be placed under a wheel or wheels o~ a vehicle in order to measure individu~l. wheel or axle loadin8~ but such known devices gener~lly utilize ~ompli¢ated load cell~ whioh are prone to failure, the devices are heavy and therefore not readily portable in the ~ense that they cannot eaeily be lifted and moved manually, and they are expensive to manuacture.
A mechanical load cell is known from ~.~. Specification I~o.
1~74316 which i~ used for determining the compression forces developed in mine supports, the call comprising a eolid body of compreesible synthetic plastice material having an internal cavity filled with gae or liquid connected to an external indicator for indicating change~ in pre6sure in the cavity when the body 6u~fers changes in volume due to compreseion load, the body having secured thereto end pre~6ure plate~
-2-~o~o~
Such a load cell cannot be u~ed as a weighing device aa any eccentric load applied to the plate~ would give a reading dif~erent to the same load when ~pplied in the centre of the platesO In a weighing device it i~ esaential for the reading to be accurate even if the load is applied eccentrically of the pressure plate.
S~RY OF ~E INVE~TI0~ -~, ~
~ his i~ention relates as aforesald to a weighing app~ratu~ and par~ icularly, but not e~clu~ively to a portable weighing apparatus fox weighing vehicles.
~n object of the invention i~ to provide a portable weighing ~pparatu~ which i8 accurats even if the load is applied eccentrically.
Another object of the invention is to provide a weighing apparatus whioh is light in weight, but robust~ and can be used for weighing lorries, trucks etc.
According to the present in~ention there i8 provided a weighing apparatua comprisin~ a resilient body formed of an elastomexic ~aterial, a closed cavity providad in said body, a fluid contain~d in said cavity, conduit mean~ oonnecting the cavity to indicator means for indicating changes in volume of the cavity when the body suffers changes due to compression forces applied thereto by the ~ember being weighed, said body h~ving B re3ilie~ ~etal plate or bars fixed to an upper surface thereof, a resilient metal load support plate moun~ed on said first mentioned plate or bars and a furthex resilien~ metal plate embedded in the body and spaced below the first mentioned plate or bars and to ~hicn reaction force~ axe applied durin~ weighing~
The wei~hing appara~us aocording to the present i~vention is portable in the sense that it can be manu21ly liPted. It is robust and therefore not prone to failure and can be m~lufactured cheaply.
~ o~ 7~
To the accomplishment of the foregoing and relatsd ends; the 10~, invention then comprises the features hexeafter full~ described and particularly pointed out in the claims, the following de~cription and annexed drawings setting forth in detail certain illustrative embodi-ments of the invention, these bei~ indicative however of only some ways i~ w~ ch tha prlnciple of the i~ention may be employed.
I In said annexed drawing3~- -J I ~igure I i8 a longitudinal section through the weighing app~ratus, Figu~a 2 iB a section taken ~long the line 2-2 of ~igure 1~
~igure 3 is a plan ~iew of tha handle in the direction of the arrow 3 indicated in Figure 1, Figure 4 is a ~ection taken along the line 4~4 indica~ed on Figure 3~ -Fig~ra 5 i~ a dia~rammatio per~pecti~e view of tha weighing apparatu~, Figure 6 ~how~ diagrammatioally l;he deflection of ths plates and bod~ when a lo~d i~ applied to the ¢entre of the top plate, Figure 7 ~how~ dlagrflmmatically the deflection of the plates a~d bodg when a load i~ applied eccent~ical:Ly, and ~igure 8 ia a diagra~m~tio illu~tration o~ a modified form of weighing appaxatus according to the presen~ in~ention.
D~SC~P~IoW o~ T~ PP~:o ~BODI~TS
~he wei~hing apparatus ha8 a bod~- 10 formed of ~n ela~tomeric material, such a~ ~atural or ~yntheti¢ rubber or a resilisnt plastics material. Preferably the body 10 i6 formed of a polybutadiene synthetic rubber~ A cavity 11 i9 formed in the body 10. Tha ~ides 12 of the body 10 are inalined to form ramp~.
Embedded il~ the body 10 and e2tending over the cavity 11 iB a yieldable metal plate 13 to whioh i~ secured a top metal plate 14. The plate 14 iB spaced from the plate 13 by bearing pads 15 formed of an ela~tomeric material. ~he plate 14 can therefore move relative to the ~4-.
plate 13 and canno-t be brought into dixect contact with the plate 13.
Any downward load applied to the plate 14 i8 always applied to th0 pla~e 13 through two ~ixed point~! i.e. through the pads 15, irrespective of the position of a~plication of the load to the plate 14, i.e. any eccen-~ri¢ally applied load to the plate 14 will always pa8~ through the fixed points.
Embedded in the body 10 is a bottom yieldable metal plate 16 to which are fixed bottom bearing baræ 17. The bars 17 fo~m two fixed .....
reaction points.
~he cavity is closed by a closure ~late 18 which is secured by ~crews 19 to the plate 16 and which is sealsd with re~pect to the bodg 10 by a æeal 20. Provided in the plate 18 is an aperture which is olo~ed by a sealing screw 21. Extendi.n~ through the plate 18 is a pa~sa~e 22 to which i~ connected a tube 2~.
Embedded i~ one side of the body 10 is a plate 24 to which is conneoted a handle 25. The ha~dle 25 comprise~ a channel section metal ~tiffening member 26 seclured to a mouldin~ 27 formed of an elastomexic m~.terial in which is formed a oavity 28 having a deformable wall portion 29. Iocated above the wall portion 2g i8 a plate 30 thx~ugh which ~xtend~.a ~Grew 31 having ~ ciroular operating head 32. ~h~ so,rew 31.
oan be rotated by the head 32 to mova the plate 30 downwaxdly to de~orm the wall portion 29 and there$ore alter the volume of tha cavity 28.
The tube 23 i~ ¢onnected to the cavity 2~ and alæo connected to the ca~ity 28 is a read-out tube 33 whi¢h extends along the handle 25 and is vi~ible~
~x~endin~ parallel to the tube 33 is a scale 34~ The e~d of the tube 33 i~ pro~ided with an exp~n~i.on chamber 35 provided with a ven~
~he cavity 11, passage 22, tube 23, o~vity 28 contain a liquid or ~a~. Preferably th2~ contain a liquid which comprises either an ethylene-glycol based liquid or an alcohol-~lyoexine based liquid~
. The under~ide of the bod~ 10 is p~ovided with cavities 36 in order to reduce the weight o~ the apparatus. Preferably the apparatus weighs 56 lbs9 or less and a weight of 48 lbs~ c~n be achieved.
In u~e of the weighing appaxatu~ the reading of the li~uid i~ the tube 33 iB ad~usted to ~ero on the scale 34 by adjusting the volume of the cavit~ 28 by means of the screw 31 and plate 20. This is neces~aIy to cater for expansion or contraction of the liquid or ga~ in the cavity etc. due to ambient temperature changes. Eavin~ set the reading to zero a vehicle wheel is run up one of the sides ~2 of the bod~ 10 and brought to rest on the plate 14. The plate 14 will bend slightly due to the load applied to it and thi~ load is applied through the pads 15 to the plate 13. m e bo~y 1~ is compre~sed between the plates 13 and 16 thus reduoing the colume of the cavity 11 cau~ing the li~uid or ga8 to be forced alon~ the passage 22~ tube 23, cavity 2B and read-out tube 33. ~he po~ition of the end of the column of li~uid or gas in the tube 33 is read against the so~le 34 w~ich is calibrated in ter~s of weight and therefore the wheel or axle loadin~ of the vehicle is readily ~een.
Figure 6 ~how~ dia&rammatically and in e~agerated fo~m the d~flec-tion of the platas 13, 14 and 16 and distortion of the cauity 11 when a load ~ i~ applied in the cent~e of the plate 14. In this case the caYit~
11 i~ de~oxmed unlformly. ~le plate~ 1~ and 16 will move towards each other~
~igure 7 shows the plates 13, 14 ~ld 16 and cavity 11 when an e¢centric load B i~ applied to the plate 14. When the load i8 eccentric the plate 13 will move oloser to the plate 16 at one end compared with the other end but the ca~ity 11 is distorted and the system lal~gely sel~
compensating.
The bo~ 10 and pla~es 13, 16 etc. are æhown as being reotangular but they may be circulax in plan view. Dhe apparatus can be manually li~ted by the handle 25.
' ' . ' ', , ' ~01~
In order to more evenly distribute on the ground or surface on which the apparatus rest~ the load applied to the weighing apparatus, the bar~ 17 can each be connected on their underside to a plate.
The elongate form of the apparatus shown enables twin wheels of a vehicle to be plaoed on the plate 14~
~o weigh a vehicle, ~uch a~ a loxr~, two weighing apparatu~ are placed on the ground a~ the spacing of the front wheels of the vehicle and the vehicle io moved until the f~ont wheels rest on the plates 14 of the two weighing apparatu~. ~he readings of the scales 34 of both weighing apparatus are then noted. The rear wheels of the vehicle æe then moved on~o the plates 14 of the two weighing app~r~tus and again the reading~ of both apparatu~ are noted. A summation of all the readlng~ will give an accurate indication of the total weight of the vehicle. ~he summation Or eaoh pair of reading~ will give the weight upon eaoh axle~
~he weighin~ apparatus i9 light in weight ~nd can be easil~ lifted manually and oan be oarried in the drivers cab of a vehicle and u~ed by him at any loc~tion to cheok the weight of ~is vehicle and thereby indi-cate to him ~hether the vehicle ~io overloaded~ ~
Instead of ths displacement of the ~uid in tube 33 being read ~ nst a ocale ~4 the fluid may be used to actuate a displaoement trans-- ducer, ~he plates 13, 14 and 16 are all flexible and can deflect, in use of the apparatus, withi~ the elastio limits of the material of which they are made.
~he ~oale ~4 can be detached and replaoed by another scale 34.
The stresæ/st~ain properties of the boa~ 10 can fluctuate according to temper~ture which would ~ive a variation in the xeading and thi~ effect c~n be obviated by the use of replaceable 6cales 34 to suit the varying ¢limatic conditions.
Even though the apparatus has bean described for weighing vehicles, it clearly oan be nsed for weighing other things.
Figurs 8 ~hows a simple constru~tion in which the plate 13 i8 replaced by two bars 37 which transmdt the load to the body 10. The to~
plate 14 i9 connected to the bars 37 in any suitable manner.
.
Such a load cell cannot be u~ed as a weighing device aa any eccentric load applied to the plate~ would give a reading dif~erent to the same load when ~pplied in the centre of the platesO In a weighing device it i~ esaential for the reading to be accurate even if the load is applied eccentrically of the pressure plate.
S~RY OF ~E INVE~TI0~ -~, ~
~ his i~ention relates as aforesald to a weighing app~ratu~ and par~ icularly, but not e~clu~ively to a portable weighing apparatus fox weighing vehicles.
~n object of the invention i~ to provide a portable weighing ~pparatu~ which i8 accurats even if the load is applied eccentrically.
Another object of the invention is to provide a weighing apparatus whioh is light in weight, but robust~ and can be used for weighing lorries, trucks etc.
According to the present in~ention there i8 provided a weighing apparatua comprisin~ a resilient body formed of an elastomexic ~aterial, a closed cavity providad in said body, a fluid contain~d in said cavity, conduit mean~ oonnecting the cavity to indicator means for indicating changes in volume of the cavity when the body suffers changes due to compression forces applied thereto by the ~ember being weighed, said body h~ving B re3ilie~ ~etal plate or bars fixed to an upper surface thereof, a resilient metal load support plate moun~ed on said first mentioned plate or bars and a furthex resilien~ metal plate embedded in the body and spaced below the first mentioned plate or bars and to ~hicn reaction force~ axe applied durin~ weighing~
The wei~hing appara~us aocording to the present i~vention is portable in the sense that it can be manu21ly liPted. It is robust and therefore not prone to failure and can be m~lufactured cheaply.
~ o~ 7~
To the accomplishment of the foregoing and relatsd ends; the 10~, invention then comprises the features hexeafter full~ described and particularly pointed out in the claims, the following de~cription and annexed drawings setting forth in detail certain illustrative embodi-ments of the invention, these bei~ indicative however of only some ways i~ w~ ch tha prlnciple of the i~ention may be employed.
I In said annexed drawing3~- -J I ~igure I i8 a longitudinal section through the weighing app~ratus, Figu~a 2 iB a section taken ~long the line 2-2 of ~igure 1~
~igure 3 is a plan ~iew of tha handle in the direction of the arrow 3 indicated in Figure 1, Figure 4 is a ~ection taken along the line 4~4 indica~ed on Figure 3~ -Fig~ra 5 i~ a dia~rammatio per~pecti~e view of tha weighing apparatu~, Figure 6 ~how~ diagrammatioally l;he deflection of ths plates and bod~ when a lo~d i~ applied to the ¢entre of the top plate, Figure 7 ~how~ dlagrflmmatically the deflection of the plates a~d bodg when a load i~ applied eccent~ical:Ly, and ~igure 8 ia a diagra~m~tio illu~tration o~ a modified form of weighing appaxatus according to the presen~ in~ention.
D~SC~P~IoW o~ T~ PP~:o ~BODI~TS
~he wei~hing apparatus ha8 a bod~- 10 formed of ~n ela~tomeric material, such a~ ~atural or ~yntheti¢ rubber or a resilisnt plastics material. Preferably the body 10 i6 formed of a polybutadiene synthetic rubber~ A cavity 11 i9 formed in the body 10. Tha ~ides 12 of the body 10 are inalined to form ramp~.
Embedded il~ the body 10 and e2tending over the cavity 11 iB a yieldable metal plate 13 to whioh i~ secured a top metal plate 14. The plate 14 iB spaced from the plate 13 by bearing pads 15 formed of an ela~tomeric material. ~he plate 14 can therefore move relative to the ~4-.
plate 13 and canno-t be brought into dixect contact with the plate 13.
Any downward load applied to the plate 14 i8 always applied to th0 pla~e 13 through two ~ixed point~! i.e. through the pads 15, irrespective of the position of a~plication of the load to the plate 14, i.e. any eccen-~ri¢ally applied load to the plate 14 will always pa8~ through the fixed points.
Embedded in the body 10 is a bottom yieldable metal plate 16 to which are fixed bottom bearing baræ 17. The bars 17 fo~m two fixed .....
reaction points.
~he cavity is closed by a closure ~late 18 which is secured by ~crews 19 to the plate 16 and which is sealsd with re~pect to the bodg 10 by a æeal 20. Provided in the plate 18 is an aperture which is olo~ed by a sealing screw 21. Extendi.n~ through the plate 18 is a pa~sa~e 22 to which i~ connected a tube 2~.
Embedded i~ one side of the body 10 is a plate 24 to which is conneoted a handle 25. The ha~dle 25 comprise~ a channel section metal ~tiffening member 26 seclured to a mouldin~ 27 formed of an elastomexic m~.terial in which is formed a oavity 28 having a deformable wall portion 29. Iocated above the wall portion 2g i8 a plate 30 thx~ugh which ~xtend~.a ~Grew 31 having ~ ciroular operating head 32. ~h~ so,rew 31.
oan be rotated by the head 32 to mova the plate 30 downwaxdly to de~orm the wall portion 29 and there$ore alter the volume of tha cavity 28.
The tube 23 i~ ¢onnected to the cavity 2~ and alæo connected to the ca~ity 28 is a read-out tube 33 whi¢h extends along the handle 25 and is vi~ible~
~x~endin~ parallel to the tube 33 is a scale 34~ The e~d of the tube 33 i~ pro~ided with an exp~n~i.on chamber 35 provided with a ven~
~he cavity 11, passage 22, tube 23, o~vity 28 contain a liquid or ~a~. Preferably th2~ contain a liquid which comprises either an ethylene-glycol based liquid or an alcohol-~lyoexine based liquid~
. The under~ide of the bod~ 10 is p~ovided with cavities 36 in order to reduce the weight o~ the apparatus. Preferably the apparatus weighs 56 lbs9 or less and a weight of 48 lbs~ c~n be achieved.
In u~e of the weighing appaxatu~ the reading of the li~uid i~ the tube 33 iB ad~usted to ~ero on the scale 34 by adjusting the volume of the cavit~ 28 by means of the screw 31 and plate 20. This is neces~aIy to cater for expansion or contraction of the liquid or ga~ in the cavity etc. due to ambient temperature changes. Eavin~ set the reading to zero a vehicle wheel is run up one of the sides ~2 of the bod~ 10 and brought to rest on the plate 14. The plate 14 will bend slightly due to the load applied to it and thi~ load is applied through the pads 15 to the plate 13. m e bo~y 1~ is compre~sed between the plates 13 and 16 thus reduoing the colume of the cavity 11 cau~ing the li~uid or ga8 to be forced alon~ the passage 22~ tube 23, cavity 2B and read-out tube 33. ~he po~ition of the end of the column of li~uid or gas in the tube 33 is read against the so~le 34 w~ich is calibrated in ter~s of weight and therefore the wheel or axle loadin~ of the vehicle is readily ~een.
Figure 6 ~how~ dia&rammatically and in e~agerated fo~m the d~flec-tion of the platas 13, 14 and 16 and distortion of the cauity 11 when a load ~ i~ applied in the cent~e of the plate 14. In this case the caYit~
11 i~ de~oxmed unlformly. ~le plate~ 1~ and 16 will move towards each other~
~igure 7 shows the plates 13, 14 ~ld 16 and cavity 11 when an e¢centric load B i~ applied to the plate 14. When the load i8 eccentric the plate 13 will move oloser to the plate 16 at one end compared with the other end but the ca~ity 11 is distorted and the system lal~gely sel~
compensating.
The bo~ 10 and pla~es 13, 16 etc. are æhown as being reotangular but they may be circulax in plan view. Dhe apparatus can be manually li~ted by the handle 25.
' ' . ' ', , ' ~01~
In order to more evenly distribute on the ground or surface on which the apparatus rest~ the load applied to the weighing apparatus, the bar~ 17 can each be connected on their underside to a plate.
The elongate form of the apparatus shown enables twin wheels of a vehicle to be plaoed on the plate 14~
~o weigh a vehicle, ~uch a~ a loxr~, two weighing apparatu~ are placed on the ground a~ the spacing of the front wheels of the vehicle and the vehicle io moved until the f~ont wheels rest on the plates 14 of the two weighing apparatu~. ~he readings of the scales 34 of both weighing apparatus are then noted. The rear wheels of the vehicle æe then moved on~o the plates 14 of the two weighing app~r~tus and again the reading~ of both apparatu~ are noted. A summation of all the readlng~ will give an accurate indication of the total weight of the vehicle. ~he summation Or eaoh pair of reading~ will give the weight upon eaoh axle~
~he weighin~ apparatus i9 light in weight ~nd can be easil~ lifted manually and oan be oarried in the drivers cab of a vehicle and u~ed by him at any loc~tion to cheok the weight of ~is vehicle and thereby indi-cate to him ~hether the vehicle ~io overloaded~ ~
Instead of ths displacement of the ~uid in tube 33 being read ~ nst a ocale ~4 the fluid may be used to actuate a displaoement trans-- ducer, ~he plates 13, 14 and 16 are all flexible and can deflect, in use of the apparatus, withi~ the elastio limits of the material of which they are made.
~he ~oale ~4 can be detached and replaoed by another scale 34.
The stresæ/st~ain properties of the boa~ 10 can fluctuate according to temper~ture which would ~ive a variation in the xeading and thi~ effect c~n be obviated by the use of replaceable 6cales 34 to suit the varying ¢limatic conditions.
Even though the apparatus has bean described for weighing vehicles, it clearly oan be nsed for weighing other things.
Figurs 8 ~hows a simple constru~tion in which the plate 13 i8 replaced by two bars 37 which transmdt the load to the body 10. The to~
plate 14 i9 connected to the bars 37 in any suitable manner.
.
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A weighing apparatus comprising a resilient body formed of an elastomeric material, a closed cavity provided in said body, a fluid contained in said cavity, conduit means connecting the cavity to indicator means for indicating changes in volume of the cavity when the body suffers changes due to compression forces applied thereto by the member being weighed, said body having a resilient metal plate or bars fixed to an upper surface thereof, a resilient metal load support plate mounted on said first mentioned plate or bars and a further resilient metal plate embedded in the body and spaced below the first mentioned plate or bars and to which reaction forces are applied during weighing.
2. A weighing apparatus as claimed in claim 1, wherein said load support plate is mounted on the first mentioned plate and spaced therefrom by members which transmit load applied to the load support plate to the first mentioned plate through fixed locations determined by the members.
3. A weighing apparatus as claimed in claim 1, wherein the cavity is connected by a conduit to a second cavity connected to the indicator means, means being provided for deforming the second cavity to cater for expansion or contraction of the fluid due to temperature changes.
4. A weighing apparatus as claimed in claim 1, wherein the cavity is connected by a conduit to a second cavity connected to the indicator means, means being provided for deforming the second cavity to cater for expansion or contraction of the fluid due to temperature changes, said second cavity being formed within a handle secured to the body and being formed in a part of the handle formed of an elastomeric material.
5. A weighing apparatus as claimed in claim 1, wherein the cavity is connected by a conduit to a second cavity connected to the indicator means, means being provided for deforming the second cavity to cater for expansion or contraction of the fluid due to temperature changes, said means for deforming the second cavity comprising a plate movable by a manually operable screw.
6. A weighing apparatus as claime in claim 1, wherein the cavity is an open cavity formed in the body and closed by a closure plate having a filling aperture closed by a sealed closure screw, said closure plate being sealed with respect to the body.
7. A weighing apparatus as claimed in claim 1, wherein the body is elongate and has two inclined sides forming ramps.
8. A weighing apparatus as claimed in claim 1, wherein the indicator means comprises an indicator tube extending paralledl with a graduated scale.
9. A weighing apparatus as claimed in claim 1, wherein the further plate is provided with bars which extend below the undersid of the body and transmit the reaction load to the further plate through fixed locations determined by the bars.
10. A weighing apparatus as claimed in claim 1, wherein the fluid com-prises an ethylene-glycol base liquid or an alcohol-glycerine based liquid.
11. A weighing apparatus as claimed in claim 1, wherein the elastomeric material comprises a polybutadiene synthetic rubber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3068877 | 1977-07-21 | ||
| GB30688/77 | 1977-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1101001A true CA1101001A (en) | 1981-05-12 |
Family
ID=10311570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA307,611A Expired CA1101001A (en) | 1977-07-21 | 1978-07-18 | Weighing apparatus |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4184555A (en) |
| JP (1) | JPS5452572A (en) |
| AU (1) | AU515148B2 (en) |
| CA (1) | CA1101001A (en) |
| DE (1) | DE2831972A1 (en) |
| FR (1) | FR2398290B1 (en) |
| IT (1) | IT1099001B (en) |
| NL (1) | NL7807677A (en) |
| ZA (1) | ZA784117B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE1161T1 (en) * | 1979-04-25 | 1982-06-15 | Thomas Francis Maltby | SCALE. |
| US4420053A (en) * | 1981-08-20 | 1983-12-13 | Litco International Inc. | Fork lift weighing apparatus |
| US4418774A (en) * | 1981-12-08 | 1983-12-06 | Franklin Electric Co., Inc. | Weight or force measuring apparatus |
| US4489798A (en) * | 1983-04-29 | 1984-12-25 | General Electrodynamics Corp. | Weight measuring apparatus with weight distributed along an array of longitudinal axes |
| EP0342305B1 (en) * | 1988-05-18 | 1991-11-13 | Ulf Lundman Aktiebolag | Arrangement in a load-sensing body |
| US5195599A (en) * | 1991-01-11 | 1993-03-23 | Salini Robert J | Merchandise damper and protector for weighing scales |
| CH681915A5 (en) * | 1991-04-26 | 1993-06-15 | Mettler Toledo Ag | |
| US5170856A (en) * | 1991-08-29 | 1992-12-15 | Yang Li Hsiang | Weighing scale with fluid pressure transmission means |
| IL117658A0 (en) * | 1996-03-26 | 1996-07-23 | Technion Res & Dev Foundation | Weighing device and method |
| US5957491A (en) | 1996-12-19 | 1999-09-28 | Automotive Systems Laboratory, Inc. | Seat weight sensor having fluid filled bladder |
| US6674024B2 (en) | 1996-12-19 | 2004-01-06 | Automotive Systems Laboratory, Inc | Seat weight sensor |
| US6045155A (en) * | 1997-01-16 | 2000-04-04 | Automotive Systems Laboratory, Inc. | Vehicle seat sensor having self-maintaining air bladder |
| US5886301A (en) * | 1997-08-04 | 1999-03-23 | Vitel, Inc. | Method and device for measuring weight |
| CH696858A5 (en) * | 1999-07-02 | 2007-12-31 | S C A I M E S A | Damper for a weighing device and weighing device provided with a damper. |
| CA2395256A1 (en) * | 1999-12-28 | 2001-07-19 | Kirk P. Bumgarner | Method and apparatus for tensile testing and rethreading optical fiber during fiber draw |
| CN100498243C (en) * | 2007-04-07 | 2009-06-10 | 山东省尤洛卡自动化仪表有限公司 | Split dynamic automobile scale |
| DE102009051702B3 (en) * | 2009-11-03 | 2011-04-28 | Roland Hörnstein GmbH & Co. KG | Weight measuring device for vehicle lifts |
| JP2013508240A (en) * | 2010-10-29 | 2013-03-07 | ローランド ヘルンシュタイン ゲーエムベーハー ウント コー． カーゲー | Car lifting platform weight measuring device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1095432A (en) * | 1900-01-01 | |||
| FR1546449A (en) * | 1966-12-16 | 1968-11-15 | Firestone Tire & Rubber Co | Hydraulic scale for weighing vehicle wheels |
| DE6929694U (en) * | 1968-08-01 | 1971-03-18 | South African Inv S Dev Corp | DEVICE FOR DETERMINING LOADS |
| US3545558A (en) * | 1968-09-20 | 1970-12-08 | Murrel C Maugh | Hydraulic load weighing scale and mounting therefor |
| GB1239248A (en) * | 1968-10-24 | 1971-07-14 | ||
| US3658142A (en) * | 1970-11-20 | 1972-04-25 | Nat Controls | Wheel load scale |
| GB1470761A (en) * | 1974-04-26 | 1977-04-21 | Hawker Siddeley Dynamics Ltd | Weighing apparatus |
| GB1443624A (en) * | 1974-07-31 | 1976-07-21 | Collier J C | Weighing devices |
| US4036317A (en) * | 1975-11-06 | 1977-07-19 | Ab Stathmos | Apparatus for measuring loads |
-
1978
- 1978-07-18 CA CA307,611A patent/CA1101001A/en not_active Expired
- 1978-07-18 US US05/925,679 patent/US4184555A/en not_active Expired - Lifetime
- 1978-07-18 NL NL7807677A patent/NL7807677A/en not_active Application Discontinuation
- 1978-07-19 ZA ZA00784117A patent/ZA784117B/en unknown
- 1978-07-20 DE DE19782831972 patent/DE2831972A1/en not_active Ceased
- 1978-07-20 AU AU38227/78A patent/AU515148B2/en not_active Expired
- 1978-07-21 FR FR7821709A patent/FR2398290B1/en not_active Expired
- 1978-07-21 IT IT25991/78A patent/IT1099001B/en active
- 1978-07-21 JP JP8849178A patent/JPS5452572A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| AU515148B2 (en) | 1981-03-19 |
| ZA784117B (en) | 1979-07-25 |
| AU3822778A (en) | 1980-01-24 |
| JPS6128088B2 (en) | 1986-06-28 |
| JPS5452572A (en) | 1979-04-25 |
| US4184555A (en) | 1980-01-22 |
| NL7807677A (en) | 1979-01-23 |
| DE2831972A1 (en) | 1979-02-01 |
| FR2398290B1 (en) | 1985-11-22 |
| IT7825991A0 (en) | 1978-07-21 |
| FR2398290A1 (en) | 1979-02-16 |
| IT1099001B (en) | 1985-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |