CA1054394A - Mass and force meter - Google Patents
Mass and force meterInfo
- Publication number
- CA1054394A CA1054394A CA249288A CA249288A CA1054394A CA 1054394 A CA1054394 A CA 1054394A CA 249288 A CA249288 A CA 249288A CA 249288 A CA249288 A CA 249288A CA 1054394 A CA1054394 A CA 1054394A
- Authority
- CA
- Canada
- Prior art keywords
- force
- strings
- frame
- guide
- distributor
- 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
- 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
- G01G3/16—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 frequency of oscillations of the body
- G01G3/165—Constructional details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
- G01L1/106—Constructional details
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Transmission Devices (AREA)
Abstract
ABSTRACT OF DISCLOSURE
Mass and force meter with a frame, a load-support and a measuring system, wherein the mass or force to be measured acts indirectly on the tension of two transversally vi-brating, pre-loaded strings excited by electronical means, so that the resultant frequency changes serve for calcul-ating the magnitude of said mass or force in a computing device. Both strings, a first transmission element for the transmission of a pre-loading force and a second trans-mission element for the transmission of a force depending on the load to be measured are fixed to a force distri-butor. The force distributor is guided in a statically determined way relative to the frame by means of the two strings and of at least one guide with respect to the pre-loading force and to the force depending on the load to be measured.
Mass and force meter with a frame, a load-support and a measuring system, wherein the mass or force to be measured acts indirectly on the tension of two transversally vi-brating, pre-loaded strings excited by electronical means, so that the resultant frequency changes serve for calcul-ating the magnitude of said mass or force in a computing device. Both strings, a first transmission element for the transmission of a pre-loading force and a second trans-mission element for the transmission of a force depending on the load to be measured are fixed to a force distri-butor. The force distributor is guided in a statically determined way relative to the frame by means of the two strings and of at least one guide with respect to the pre-loading force and to the force depending on the load to be measured.
Description
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The present invention rela-tes to a mass and force meter with a frame, a load-support and a measuring system, wherein the mass or force to be measured acts indirectly on the tension of two transversally vibrating, pre-loaded strings excited by electronical means, so that the resul-tant freq- .
~ uency changes serve for calculating the magnitude of said mass or f`orce in a computing device. Both strings, a first transmission element for the transmission of a pre-loading ~ ~-force and a second transmission element for the transmission :
of a force depending on the load to be measured are fixed to a force distributor.
Such meters are well known. Swiss Patent 469,973 des-~, cribes such a device used as a scale, wherein two parallel, : - .
vertically mounted strings are pre-loaded by the weight of ~ .
a pre-loading mass. A first vertical transmission element connects said mass to a lever acting as force distributor.
These strings are additionally loaded by a force depending on the load to be measured which is transrnitted to the force distributor by a second vertical transmission e].ement. U.S.
Patent 3,423,999 describes a mass and force meter of the sarne type, wherein both strings and both transmission ele- ~.
ments radiate from a central point, so that the distribution .. of the mentioned forces between both stringsis determined ~ by the direction of these -two forces relative to that of the two strings. The central body to which two strings and the two transmission elernents are fixed, has only a fastening function, it is not a force distributor. .
In these meters the transmission ratio of -the two : ,, , ,' ~:' ' .
forces on the two strings can be adjusted. In -the first meter men-tioned this adjustmen-t is made by varying the distances of the four elements parallel to each other, i.e.
, ' the two strings and the two -transmission elements. That ~:
means the adjus-tment is made by variation of the ratios of -the lever arms. To obtain an accurate adjustment, these lever arms must be long enough, i.e. -they must have a certain mass. The meter as a whole becomes then sensible to shocks, if` the four degrees of freedom not involved in the measuring process are not e~cluded by guides and if the -moment of inertia of the lever in the plane of the string is not compensated by a second lever.
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The second meter offers a solution to overcome this disadvantage. The adjustment is carried out by varying the directions of the two ", : . ., .
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forces relatively to the two non-parallel strings. An accura-te adjustment of the angles can only be obtained if the two strings and the two force -transmission elements are long enough, which entails technical problems eventually limiting the efficiency of -the meter. Also a geometrical imprefection of the parts can have a negative influence on the characteristic curve of the meter. In particular an :
eccentrical fastening of the transmission elements to the ~ :
central body can cause a load-depending rotation of this : :
body. .
This rotation does not cause an error only if it is compensated by an adjustment of the angles which increases the adjusting range. Substituting the massive force distri-butor with wire-shaped transmission elements has the advan-. :
tage of making the meter comparatively insensible to shocks.
The mass of the central body forming the fastening head is considerably smaller than the mass of the force distributor of the first mentioned meter. This property of the force : distributor is useless for the scale, when the weight of the ., ~',:
pre-loading mass or the force dependingon the load to be measured are transmitted to the two strings by a transmission chain, i.e., by a number of consecutive massive transmission ~ :
elements.
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It is an object of the present invention to create means permitting a more accurate adjustmen-t than tha-t of known meters and for meters with a transmission chain, permitting to simplify the whole construction and -to obtain high insensibility to shocks.
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Another ob3ect of the invention is to guide the force distributor in a s-tatically determined way relatively to the :frame by means of the -two strings and of at least one .
guide with respec-t to the pre-loading force and to the .. . ~
force depending on the load -to be measured.
A further object of -the invention is -to provide a .
mass and force a meter comprising a frame, a load support digital evaluation and display means mounted on said frame~ ; :
:; : -two electrically excited, transversely vibrating, pre- ~- ~
. . .
tensioned strings, each having one end fixed to said frame -a force distributor, the other ends of said strings being connected to said force distributor, first and second trans-mission elements for transmitting to said force distributor a pre-tensioning force and a force depending on the load ~.. .
to be measured respectively, one end of each of said trans-mission elements being . -~
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fixed to said force distributor, their other ends being operatively connected to receive their respective forces, means for applying to the evaluation and display means resultant -frequency variations caused by the application of said loads to said strings for ; computation and display of the magnitude of the measured load, a guide having one end connected to said frame a~d its other end connected to said force distributor, said guide and said strings guiding said force distributor in a statically defined way relative to said frame with respect to said pre tensioning force and said force depending on the load to be measured.
In accordance with an embodiment, a mass and force meter comprises a frame, a load support, digital evaluation and display means mounted o~ said frame, two electrically excited~ transversely vibrating, pre-tensioned strings, each having one end fixed to said frame, a force distributor, the other ends of said strings being connected to said force distributor, first and second trans-mission elements for transmitting to said force distributor a pre~
- tensioning force and a force depending on the load to be measured respectively, one end of each of said transmission elements being ;~
fixed to said force distributor, their other ends being operatively connected to receive their respective forces, means for applying to the evaluation and display means resultant frequency variations caused by the application of said loads to said strings for ; computation and display of the magnitude of the measured load, characterized by a guide having one end connectéd to said frame and its other end connected to said force distributor, said guide and said strings guiding said force distributor in a statically defined way relative to said frame with respect to said pre-; tensioning force and said force depending on the load to be measured. ~
` In the accompanying drawing some embodiments of the -- object of the invention are schematically represented.
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.: ' .' : 1 , 3L(~5~394 Fig. l-S show each an embodiment, Fig. 6-7 show each a variant of the embodiment of Fig. 5 7 ~.
Fig. 8 shows a variant of the embodiment of Fig. 7, and , Fig. 9 shows a schematical representation of a force distributor with its guiding elements.
Fig. 1 shows a first embodiment. It represents a table balance. All the organs are located substantially in the plane of the drawing. This balance has a frame 1, to which a load support
The present invention rela-tes to a mass and force meter with a frame, a load-support and a measuring system, wherein the mass or force to be measured acts indirectly on the tension of two transversally vibrating, pre-loaded strings excited by electronical means, so that the resul-tant freq- .
~ uency changes serve for calculating the magnitude of said mass or f`orce in a computing device. Both strings, a first transmission element for the transmission of a pre-loading ~ ~-force and a second transmission element for the transmission :
of a force depending on the load to be measured are fixed to a force distributor.
Such meters are well known. Swiss Patent 469,973 des-~, cribes such a device used as a scale, wherein two parallel, : - .
vertically mounted strings are pre-loaded by the weight of ~ .
a pre-loading mass. A first vertical transmission element connects said mass to a lever acting as force distributor.
These strings are additionally loaded by a force depending on the load to be measured which is transrnitted to the force distributor by a second vertical transmission e].ement. U.S.
Patent 3,423,999 describes a mass and force meter of the sarne type, wherein both strings and both transmission ele- ~.
ments radiate from a central point, so that the distribution .. of the mentioned forces between both stringsis determined ~ by the direction of these -two forces relative to that of the two strings. The central body to which two strings and the two transmission elernents are fixed, has only a fastening function, it is not a force distributor. .
In these meters the transmission ratio of -the two : ,, , ,' ~:' ' .
forces on the two strings can be adjusted. In -the first meter men-tioned this adjustmen-t is made by varying the distances of the four elements parallel to each other, i.e.
, ' the two strings and the two -transmission elements. That ~:
means the adjus-tment is made by variation of the ratios of -the lever arms. To obtain an accurate adjustment, these lever arms must be long enough, i.e. -they must have a certain mass. The meter as a whole becomes then sensible to shocks, if` the four degrees of freedom not involved in the measuring process are not e~cluded by guides and if the -moment of inertia of the lever in the plane of the string is not compensated by a second lever.
: :
The second meter offers a solution to overcome this disadvantage. The adjustment is carried out by varying the directions of the two ", : . ., .
.:, : ,, ., ~
, :~, ." : .
. ~
. .
-;
:
,,~, ' :.
- la -, . .
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forces relatively to the two non-parallel strings. An accura-te adjustment of the angles can only be obtained if the two strings and the two force -transmission elements are long enough, which entails technical problems eventually limiting the efficiency of -the meter. Also a geometrical imprefection of the parts can have a negative influence on the characteristic curve of the meter. In particular an :
eccentrical fastening of the transmission elements to the ~ :
central body can cause a load-depending rotation of this : :
body. .
This rotation does not cause an error only if it is compensated by an adjustment of the angles which increases the adjusting range. Substituting the massive force distri-butor with wire-shaped transmission elements has the advan-. :
tage of making the meter comparatively insensible to shocks.
The mass of the central body forming the fastening head is considerably smaller than the mass of the force distributor of the first mentioned meter. This property of the force : distributor is useless for the scale, when the weight of the ., ~',:
pre-loading mass or the force dependingon the load to be measured are transmitted to the two strings by a transmission chain, i.e., by a number of consecutive massive transmission ~ :
elements.
.. ~
It is an object of the present invention to create means permitting a more accurate adjustmen-t than tha-t of known meters and for meters with a transmission chain, permitting to simplify the whole construction and -to obtain high insensibility to shocks.
*
.
` ~:
3~
Another ob3ect of the invention is to guide the force distributor in a s-tatically determined way relatively to the :frame by means of the -two strings and of at least one .
guide with respec-t to the pre-loading force and to the .. . ~
force depending on the load -to be measured.
A further object of -the invention is -to provide a .
mass and force a meter comprising a frame, a load support digital evaluation and display means mounted on said frame~ ; :
:; : -two electrically excited, transversely vibrating, pre- ~- ~
. . .
tensioned strings, each having one end fixed to said frame -a force distributor, the other ends of said strings being connected to said force distributor, first and second trans-mission elements for transmitting to said force distributor a pre-tensioning force and a force depending on the load ~.. .
to be measured respectively, one end of each of said trans-mission elements being . -~
,: ,, ~" ~':
.. , . ' .
', ' :
.'., ~ .,.
', .
~, :, . - Za -~o~a~3~
fixed to said force distributor, their other ends being operatively connected to receive their respective forces, means for applying to the evaluation and display means resultant -frequency variations caused by the application of said loads to said strings for ; computation and display of the magnitude of the measured load, a guide having one end connected to said frame a~d its other end connected to said force distributor, said guide and said strings guiding said force distributor in a statically defined way relative to said frame with respect to said pre tensioning force and said force depending on the load to be measured.
In accordance with an embodiment, a mass and force meter comprises a frame, a load support, digital evaluation and display means mounted o~ said frame, two electrically excited~ transversely vibrating, pre-tensioned strings, each having one end fixed to said frame, a force distributor, the other ends of said strings being connected to said force distributor, first and second trans-mission elements for transmitting to said force distributor a pre~
- tensioning force and a force depending on the load to be measured respectively, one end of each of said transmission elements being ;~
fixed to said force distributor, their other ends being operatively connected to receive their respective forces, means for applying to the evaluation and display means resultant frequency variations caused by the application of said loads to said strings for ; computation and display of the magnitude of the measured load, characterized by a guide having one end connectéd to said frame and its other end connected to said force distributor, said guide and said strings guiding said force distributor in a statically defined way relative to said frame with respect to said pre-; tensioning force and said force depending on the load to be measured. ~
` In the accompanying drawing some embodiments of the -- object of the invention are schematically represented.
)~ ~ ~
.: ' .' : 1 , 3L(~5~394 Fig. l-S show each an embodiment, Fig. 6-7 show each a variant of the embodiment of Fig. 5 7 ~.
Fig. 8 shows a variant of the embodiment of Fig. 7, and , Fig. 9 shows a schematical representation of a force distributor with its guiding elements.
Fig. 1 shows a first embodiment. It represents a table balance. All the organs are located substantially in the plane of the drawing. This balance has a frame 1, to which a load support
2 is -fixed by means of guides 3. A rigid rod 4 with two hinges 5 is fixed to load support 2. The lower end of this rod 4 is connected ~ -~
to a force distributor 5 which is suspended to a guide 7 fixed to frame 1. This guide 7 consists preferably of a wire. It is mounted obliquely so as to form an angle of 50 to 85~ with a hori-. .J
zontal plane. Two identical, horizontal strings 8 are fixed to 'l frame 1, their other ends are connected to force distributor 6. ~;~
'l Exciting and sensing heads are mounted between strings 8 and con-~ nected to a digital evaluation and display device 10. A two-arm ;~
-1 lever 11 is rotatably mounted on frame 1~ A pre-loading mass 12 i5 fixed to its ,substantially horizontal arm. Its substantially vertical arm is connected to force distributor 6 by means of a wire :, .
13. The weight of the pre-loading mass 12 creates the pre-loading force acting on force distributor 6. Wire 13 being located in the ,horizontal symmetry plane between the two strings 8 9 the pre-loading force acting through wire 13 is evenly distributed between the t~lO strings ~. Due to the pre-loading force, these strings 8 remain always under tension. Guide 7 is obviously :, .
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not loaded by thi~s pre-loading force. A mass 14 whose magnitud is to be determined, is put on load .support 2. I-ts weight i5 ; tran~mitted to force distributor 6 by rod 4. The force acting on force distributor 6 is proportional to the weight to be measured.
It is called the measuring force. This measuring force is com-pensatecl by guide 7 and by the two strings 8 in such a way that guide 7 is under traction, while the two strings 8 are under the action of a horizontal force, whose line of action passes -through : ~
the intersection point 15 of the axes of rod ~ and guide 7 The ver-tical component of the force of traction in guide 7 is equal and opposite to the measuring force transmitted by rod 4, and the horizontal component of this force of traction in guide 7 is equal to the horizontal force acting on strings 8. This horizon-tal force is not evenly distributed between the two strings 8~ It is divided into two unequal components in proportion to the height of the intersection point 15 above the horizontal ~lanes through each of the two strings 8. In the embodiment re~resented the upper string 8 is loaded additionally to the pre-load and the lower one is, to a lower extent, relieved. In the whole measuring range this relief ;~
remains al~ays smaller than the pre-loading force, so that the lower string 8 remains under traction. Thus the three guiding elements of force distributor 6, i.e. guide 7 and both string~ 8, are under traction in the whole measuring range. The force dis-tributor 6 is guided by guide 7 and by strings 8 1n a statically determinéclway relative to frar,le 1, with regard to the pre-loading force and to the measuring force. !~`
Because of the described disposit:ion of guide 7 (big angle with the horizontal plane) the measuring force transmitted :
by rod 4 to force di.stributor 6 is recluced when distributed he- ;
tween strings 8.
In the embodiment accordiny to Fig. 2 another table _~ !
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balance i5 represen-ted, wherein s-trings 8, exciting and sensing heads 9, and lever 11 with the pre-loading mass 12 are not fixed to frame 1, but to load support 2. In this embodiment force distributor 6 is elongated and mounted sub-stantially horizontal. It is connected to load suppor-t 2 by means of a guide 16 consisting of a rod with two hinges.
This guide 16 allows for a statically determined guidance . ,~ .
i of force distributor 6 rela-tively to the load support 2.
Another guide 17, also consisting of a rod with two hinges, I connects force distributor 6 to frame 1. This guide 17 , allows, together with both guides 3, for a statically deter~
.;~ mined guidance of load support 2 relative to frame 1. It also transmits the measuring force to force distributor 6.
' Apart from the inversed arrangement of the main elements of the balance, this embodiment differs from that of Fig.
1 by the geometrical arrangement of various elements.
' Strings 8 form an obtuse angle. Wire 13 passes through the intersection point 18 of the axes of the two strings8 along the bisector of their angle, and -transmits the pre-loading force evenly, but multiplied, to both strings 8. The weigh-t - ~`
Or mass 14 to be determined loads force distributor 6 through vertical guide 17. This load, i.e. the measuring force, is compensated by guide 16 and by strings 8. Guide ~`
16 being vertical too, the vectorial sum of the two forces acting on strings 8, and generated by the measuring force, is vertical force with its line of action passing through ;
intersection point 18. The magnitude of -this force depends on the horizontal position of this intersection poin-t 18 _ 5 _ . ~
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relative to guicles 16 and 17.
With the length and angle proportions ehosen in this embodiment, -the measuring force is reduced when transmitted to strings 8. The lower string 8 is loaded additionally to the pre-loading force, the upper one is, to a lower extent relieved. By varying the relative position of these elements different `;'~, . .:
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` distributions o-f`-the measuring force can be ob-talned. As ' .
in the first embodiment, here tooforce distributor 6 is guided in a statically determined way, wi-th regard to the pre-loading force and the measuring force, relatively to the frame 1, by strings 8 and guides 16, 17.
Guide 17 could present a certain axial elasticity, and could be replaced by a stiff spring. Thereby the pre-loading mass 12 would be connected to load support 2 stiffer than load support 2 is connected to frame 1. This brings .
~ known advantages in the case of shocks and vibrations.
`l In Fig. 3 a third embodiment of a table balance is ~ '~
` represented. Load support 19 ls suspended to a vertical ,! wire 20 fixed to force distributor 6. A guide 3 is fixed at ;-` the end of wire 20, it guides load support 19 with respect ~il - , ~~ to frame l. Also pre-loading mass 12 is guided by a single ~ " , ~; guide 21 with respect to frame l. It is suspended to a î wire system 22, 23 to which horizontal wire 13 is fixed. By ~, varying the inclination of part 23 of the wire system 22, 23~the transmission ratio of the weight of pre-loading mass 12 to force distributor 6 can be adjusted. The , :
resultant pre-loading force acting on force distributor 6 is evenly distributed between the two horizon-tally mounted ~1 , strings 8. Guide 7 is so mounted that its angle with the horizontal plane is smaller than ~5. The ratio with which , ~l the measu*ing force - i.e. of the force acting in wire 20-:
is transmitted to the two strings 8 is thus correspondingly ~
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~.~)5~3~4 increased. Frame 1 and force distributor 6 are provided with fastenting heads 24 for the ends of strings 8 which are acting as low-pass filters, in order to avoid disturbing vibration couplings in the range of the frequencies of ~:
the strings. Force distributor 6 is guided in a statically determined way by the two strings 8 and by guide 7 with res- .
`, pect to frame 1.
~ In the embodiment according to ~ig. 4, a two-step ' 1 ,'~ -~ ` ' , x ~" .
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analytical scale is represen-ted. A main lever Z5 is connec-I -ted to frame 1 by means of a wire serving as ver-tical guide 26 of a rod serving as horizontal guide 27. Load support 19 is suspended at one of its ends, at its other end it has a counterweight 28. The two strings 8 and the exciting and sensing heads 9 are fixed to lever 25. The other ends of -the strings 8, forming an acute angle 9 are f`ixed to a part . ~ .
of force distributor 6. Between lever 25 and force distribu-tor 6 a pre-loaded pressure spring 29 is mounted. Its line , of action corresponds to the bisector of the angle formed -' by strings 8 and passes through intersection point 18. Thus this spring 29 generates a pre-loading force evenly distri-:, . , buted between strings 8. As the pre-loading force is pro-duced by a spring, the device represented can be considered ~ ~, as a force meter used as a scale.
Furthermore, force distributor 6 is connec-ted to lever . ~ . . :.
25 by means of a wire-shaped guide 30. Force distributor , 6 together with lever 25 with its counter-weigh-t 28 and load support 19 rests on frame 1 by means of knife edges 31, 32 and a support 33. Lever 25 and force distributor 6 are thus guided in a statically determined way relatively to frame 1.
~I Force distributor 6 is loaded by the measuring force through I support 33. Knife edges 31, 32 are disposed one upon the '~, ,l other, forming a vertical guide with support 33. A second -position of support 33 is represented with dotted lines, in I which it is mounted between two further kniEe edges 34, 35.
This corresponds to a change of the transmission ratio of ~ the load on the strings 8, i.e. of the ratio between the -, weight of mass-14 and of part of the weights ~ - 7 -., .
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set 59 and the measuring f`orce acting on :lorce distri-butor 6, as well ~s of' the ratio of this measuring :force ,, and the ac-tual additional load of strings 8. With a suit-able well known automatic device, the above described meter can be used as -two-step analytical scale~
: If main lever 25 and force distributor 6 are considered ~`'' ,i :
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as a unit, this unit is gulded by vertical guide 26, horizon-tal guide 27 and vertical support 33. The measuring force loading force distributor 6 through support 33 is generated by the total load. The arm length with which this load acts on guide 26 is much longer than that of the counter-force through support 33 relatively to the same guide 26. There-fore support 33 is loaded by a vertical force, the measuringforce, which is, in the same ra-tio as that of said arm lengths~
bigger than -the load itself. Horizontal guide 27 remains thereby unloaded, Considering now main lever 25 as being fixed to frame 1, it is loaded by the vertical measuring force through support 33, but not guided. Guide 30 being vertical, the vertical force through support 33 generates two forces acting upon strings 8, whose vectorial sum is a ` vertical force wi~h its line of action passing through intersection point 18. The horizontal distance from the i axis of guide 30 to intersection point 18 being considerably smaller than the distance from this axis to support 33, the .
vectorial sum of the forces acting on strings 8, i.e, the vertical force through in-tersection point 18, is much bigger than the vertical measuring force. Because of the acute angle formed by strings 8 this force through intersection point 18 is highly multiplied when transmitted to strings 8 With the disposition chosen the left string 8 is additionally loaded and the right string 8 is, to a lower extent, rel~
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ieved.
In Fig. 5 a fifth embodiment is represented, i-t is a ~ - 8 ., ~ ', .
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table balance. The disposition of' the main elements corresponds to tha-t of Fig. 1. Frame 1 and force dis-tri-butor 6 are provided wi-th fastening heads 24 and 36 for strings 8. The weight of the pre-loading mass 12 fixed to -the two -arm rotatably moun-ted lever 11 is transmitted to head 36 of force distributor 6 by means of a rod 37 serving ~ !:
as transmission element. Load support 2 is connected to , force distributor 6 by means of a spring 38 serving ~.
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',':'",''''-' ,'' ' :' . ' ,:,. ,, , ' , :, ~1~543~4 as force -transmission element, so -tha-t the weight of mass 14 acts on Eorce distributor 6 through -this spring 38. Between -;
load support 2 and frame l a viscosity absorber 29 is pro-vided. Another viscosity absorber 40 is provided between pre-loading mass 12 and frame l. Lever ll presents a re-duced section 41 acting like a leaf spring, so that the statically determined guidance of the pre-loading mass 12 relative to frame 1 is resilient. Spring 38 and absorbers 39, 40 serve for eliminating the high frequency parts of the --forces ac-ting on strings 8. Force distributor 6 is guided , in a statically determined way relatively to frame l by guide 7 and by both strings 8 with regard to the preloading force in rod 37, and to the measuring force through spring 38.
Fig. 6 shows a variant of the embodiment according to Fig. 5, wherein instead of wire-shaped guide 7 the vertical Z arm of lever ll serves as a guide between -Eorce distributor
to a force distributor 5 which is suspended to a guide 7 fixed to frame 1. This guide 7 consists preferably of a wire. It is mounted obliquely so as to form an angle of 50 to 85~ with a hori-. .J
zontal plane. Two identical, horizontal strings 8 are fixed to 'l frame 1, their other ends are connected to force distributor 6. ~;~
'l Exciting and sensing heads are mounted between strings 8 and con-~ nected to a digital evaluation and display device 10. A two-arm ;~
-1 lever 11 is rotatably mounted on frame 1~ A pre-loading mass 12 i5 fixed to its ,substantially horizontal arm. Its substantially vertical arm is connected to force distributor 6 by means of a wire :, .
13. The weight of the pre-loading mass 12 creates the pre-loading force acting on force distributor 6. Wire 13 being located in the ,horizontal symmetry plane between the two strings 8 9 the pre-loading force acting through wire 13 is evenly distributed between the t~lO strings ~. Due to the pre-loading force, these strings 8 remain always under tension. Guide 7 is obviously :, .
' - ~
,~ ' ' ~:
, - 3a - `
. ~
~5~3~
not loaded by thi~s pre-loading force. A mass 14 whose magnitud is to be determined, is put on load .support 2. I-ts weight i5 ; tran~mitted to force distributor 6 by rod 4. The force acting on force distributor 6 is proportional to the weight to be measured.
It is called the measuring force. This measuring force is com-pensatecl by guide 7 and by the two strings 8 in such a way that guide 7 is under traction, while the two strings 8 are under the action of a horizontal force, whose line of action passes -through : ~
the intersection point 15 of the axes of rod ~ and guide 7 The ver-tical component of the force of traction in guide 7 is equal and opposite to the measuring force transmitted by rod 4, and the horizontal component of this force of traction in guide 7 is equal to the horizontal force acting on strings 8. This horizon-tal force is not evenly distributed between the two strings 8~ It is divided into two unequal components in proportion to the height of the intersection point 15 above the horizontal ~lanes through each of the two strings 8. In the embodiment re~resented the upper string 8 is loaded additionally to the pre-load and the lower one is, to a lower extent, relieved. In the whole measuring range this relief ;~
remains al~ays smaller than the pre-loading force, so that the lower string 8 remains under traction. Thus the three guiding elements of force distributor 6, i.e. guide 7 and both string~ 8, are under traction in the whole measuring range. The force dis-tributor 6 is guided by guide 7 and by strings 8 1n a statically determinéclway relative to frar,le 1, with regard to the pre-loading force and to the measuring force. !~`
Because of the described disposit:ion of guide 7 (big angle with the horizontal plane) the measuring force transmitted :
by rod 4 to force di.stributor 6 is recluced when distributed he- ;
tween strings 8.
In the embodiment accordiny to Fig. 2 another table _~ !
-,. ~. . . .
i~)S~3~
balance i5 represen-ted, wherein s-trings 8, exciting and sensing heads 9, and lever 11 with the pre-loading mass 12 are not fixed to frame 1, but to load support 2. In this embodiment force distributor 6 is elongated and mounted sub-stantially horizontal. It is connected to load suppor-t 2 by means of a guide 16 consisting of a rod with two hinges.
This guide 16 allows for a statically determined guidance . ,~ .
i of force distributor 6 rela-tively to the load support 2.
Another guide 17, also consisting of a rod with two hinges, I connects force distributor 6 to frame 1. This guide 17 , allows, together with both guides 3, for a statically deter~
.;~ mined guidance of load support 2 relative to frame 1. It also transmits the measuring force to force distributor 6.
' Apart from the inversed arrangement of the main elements of the balance, this embodiment differs from that of Fig.
1 by the geometrical arrangement of various elements.
' Strings 8 form an obtuse angle. Wire 13 passes through the intersection point 18 of the axes of the two strings8 along the bisector of their angle, and -transmits the pre-loading force evenly, but multiplied, to both strings 8. The weigh-t - ~`
Or mass 14 to be determined loads force distributor 6 through vertical guide 17. This load, i.e. the measuring force, is compensated by guide 16 and by strings 8. Guide ~`
16 being vertical too, the vectorial sum of the two forces acting on strings 8, and generated by the measuring force, is vertical force with its line of action passing through ;
intersection point 18. The magnitude of -this force depends on the horizontal position of this intersection poin-t 18 _ 5 _ . ~
..... ..
,: . :
relative to guicles 16 and 17.
With the length and angle proportions ehosen in this embodiment, -the measuring force is reduced when transmitted to strings 8. The lower string 8 is loaded additionally to the pre-loading force, the upper one is, to a lower extent relieved. By varying the relative position of these elements different `;'~, . .:
. , , ; . .:
' '' i~
, ~'; .:
' ... .
: :
.. ~ .
- Sa -~ .
:,- . : - . , :: . , ,:: . , .
, :: ~ , , , .'i, ' -' .. . . .
` distributions o-f`-the measuring force can be ob-talned. As ' .
in the first embodiment, here tooforce distributor 6 is guided in a statically determined way, wi-th regard to the pre-loading force and the measuring force, relatively to the frame 1, by strings 8 and guides 16, 17.
Guide 17 could present a certain axial elasticity, and could be replaced by a stiff spring. Thereby the pre-loading mass 12 would be connected to load support 2 stiffer than load support 2 is connected to frame 1. This brings .
~ known advantages in the case of shocks and vibrations.
`l In Fig. 3 a third embodiment of a table balance is ~ '~
` represented. Load support 19 ls suspended to a vertical ,! wire 20 fixed to force distributor 6. A guide 3 is fixed at ;-` the end of wire 20, it guides load support 19 with respect ~il - , ~~ to frame l. Also pre-loading mass 12 is guided by a single ~ " , ~; guide 21 with respect to frame l. It is suspended to a î wire system 22, 23 to which horizontal wire 13 is fixed. By ~, varying the inclination of part 23 of the wire system 22, 23~the transmission ratio of the weight of pre-loading mass 12 to force distributor 6 can be adjusted. The , :
resultant pre-loading force acting on force distributor 6 is evenly distributed between the two horizon-tally mounted ~1 , strings 8. Guide 7 is so mounted that its angle with the horizontal plane is smaller than ~5. The ratio with which , ~l the measu*ing force - i.e. of the force acting in wire 20-:
is transmitted to the two strings 8 is thus correspondingly ~
;:
.
~ 6 -., ,;', . ,~ . , :: , "" ~ , '',:"": , ~` :
~.~)5~3~4 increased. Frame 1 and force distributor 6 are provided with fastenting heads 24 for the ends of strings 8 which are acting as low-pass filters, in order to avoid disturbing vibration couplings in the range of the frequencies of ~:
the strings. Force distributor 6 is guided in a statically determined way by the two strings 8 and by guide 7 with res- .
`, pect to frame 1.
~ In the embodiment according to ~ig. 4, a two-step ' 1 ,'~ -~ ` ' , x ~" .
, .
, 1 ` ~
,.~ " ' ,,~ . , :~ ' : ' :, ': ~ ', . :
-: ' , .. .. .
: ' . .
':'f ' ' ' ' ': ~f ~ :
' ' - 6a -~' :: ~ , - , , ,: .
.: , ~ , :, , :, , , , . : :
,: : , ,: ~ ~
~S43~ :
analytical scale is represen-ted. A main lever Z5 is connec-I -ted to frame 1 by means of a wire serving as ver-tical guide 26 of a rod serving as horizontal guide 27. Load support 19 is suspended at one of its ends, at its other end it has a counterweight 28. The two strings 8 and the exciting and sensing heads 9 are fixed to lever 25. The other ends of -the strings 8, forming an acute angle 9 are f`ixed to a part . ~ .
of force distributor 6. Between lever 25 and force distribu-tor 6 a pre-loaded pressure spring 29 is mounted. Its line , of action corresponds to the bisector of the angle formed -' by strings 8 and passes through intersection point 18. Thus this spring 29 generates a pre-loading force evenly distri-:, . , buted between strings 8. As the pre-loading force is pro-duced by a spring, the device represented can be considered ~ ~, as a force meter used as a scale.
Furthermore, force distributor 6 is connec-ted to lever . ~ . . :.
25 by means of a wire-shaped guide 30. Force distributor , 6 together with lever 25 with its counter-weigh-t 28 and load support 19 rests on frame 1 by means of knife edges 31, 32 and a support 33. Lever 25 and force distributor 6 are thus guided in a statically determined way relatively to frame 1.
~I Force distributor 6 is loaded by the measuring force through I support 33. Knife edges 31, 32 are disposed one upon the '~, ,l other, forming a vertical guide with support 33. A second -position of support 33 is represented with dotted lines, in I which it is mounted between two further kniEe edges 34, 35.
This corresponds to a change of the transmission ratio of ~ the load on the strings 8, i.e. of the ratio between the -, weight of mass-14 and of part of the weights ~ - 7 -., .
,.;- - , ,/ . , . :
:,,'. ' . ,' , i43~
set 59 and the measuring f`orce acting on :lorce distri-butor 6, as well ~s of' the ratio of this measuring :force ,, and the ac-tual additional load of strings 8. With a suit-able well known automatic device, the above described meter can be used as -two-step analytical scale~
: If main lever 25 and force distributor 6 are considered ~`'' ,i :
, '1 ` : :,' ,i :, :: .
'~, "' ' ' `
:~ .
' 5 ~
~, .' ~` ~.
7 .:, , ~`' ;~
'~ ;, . ~ ' '' .
,'~
`,' ' ' .
i'l, ' , .~ .
. - 7a - ;:` ~
,' ` ~ ' , .
: '. ' ' , . - - . . .. . . . .
., : , :
. . . . . . . .
:~35~L3~
as a unit, this unit is gulded by vertical guide 26, horizon-tal guide 27 and vertical support 33. The measuring force loading force distributor 6 through support 33 is generated by the total load. The arm length with which this load acts on guide 26 is much longer than that of the counter-force through support 33 relatively to the same guide 26. There-fore support 33 is loaded by a vertical force, the measuringforce, which is, in the same ra-tio as that of said arm lengths~
bigger than -the load itself. Horizontal guide 27 remains thereby unloaded, Considering now main lever 25 as being fixed to frame 1, it is loaded by the vertical measuring force through support 33, but not guided. Guide 30 being vertical, the vertical force through support 33 generates two forces acting upon strings 8, whose vectorial sum is a ` vertical force wi~h its line of action passing through intersection point 18. The horizontal distance from the i axis of guide 30 to intersection point 18 being considerably smaller than the distance from this axis to support 33, the .
vectorial sum of the forces acting on strings 8, i.e, the vertical force through in-tersection point 18, is much bigger than the vertical measuring force. Because of the acute angle formed by strings 8 this force through intersection point 18 is highly multiplied when transmitted to strings 8 With the disposition chosen the left string 8 is additionally loaded and the right string 8 is, to a lower extent, rel~
...
ieved.
In Fig. 5 a fifth embodiment is represented, i-t is a ~ - 8 ., ~ ', .
" ~ . .
''~,~ ' ' .
s~
table balance. The disposition of' the main elements corresponds to tha-t of Fig. 1. Frame 1 and force dis-tri-butor 6 are provided wi-th fastening heads 24 and 36 for strings 8. The weight of the pre-loading mass 12 fixed to -the two -arm rotatably moun-ted lever 11 is transmitted to head 36 of force distributor 6 by means of a rod 37 serving ~ !:
as transmission element. Load support 2 is connected to , force distributor 6 by means of a spring 38 serving ~.
: '~ . .-:' . . ' ,~, . . .
'`''( ' . . :
, ~ ..
:~
.,:'~ ' ~: '' .... .
,~, ''"~ ":' .
,'"'' '. ' ~ '.
'~ ~ ' . ' ,:
.: . .
- 8a -:
- , .
; ~ ,:~ ,: .. . . . . .
',':'",''''-' ,'' ' :' . ' ,:,. ,, , ' , :, ~1~543~4 as force -transmission element, so -tha-t the weight of mass 14 acts on Eorce distributor 6 through -this spring 38. Between -;
load support 2 and frame l a viscosity absorber 29 is pro-vided. Another viscosity absorber 40 is provided between pre-loading mass 12 and frame l. Lever ll presents a re-duced section 41 acting like a leaf spring, so that the statically determined guidance of the pre-loading mass 12 relative to frame 1 is resilient. Spring 38 and absorbers 39, 40 serve for eliminating the high frequency parts of the --forces ac-ting on strings 8. Force distributor 6 is guided , in a statically determined way relatively to frame l by guide 7 and by both strings 8 with regard to the preloading force in rod 37, and to the measuring force through spring 38.
Fig. 6 shows a variant of the embodiment according to Fig. 5, wherein instead of wire-shaped guide 7 the vertical Z arm of lever ll serves as a guide between -Eorce distributor
3` 6 and frame 1. Force distributor 6 is then guided by this arm and by both strings 8. -~
",.Z ~' ~
~ Fig. 7 shows, in a perspec-tive view, a variant of the ~ :
Z embodiment according to Fig. 5. Force distributor 6, guide ~, 7, both strings 8 and rod 37 are mounted horizontally. The weight of mass 14 is transmitted to force distributor 6 by means of a wire-shaped guide 42. Rod 37 presents at one end a pin 43 serving as a joint, and at its other end a leaf~
spring 44 laying in a vertical plane, also serving as a joint~
Furthermore, two verticaly guides 45, 46 are provided, which , determine statically, together with rod 37, the height of force distributor 6. Force distributor 6 is guided in a ~ _ g ' ~ :
''': ' , , ' -: ' ' ... .
~(~S~L3~
s-ta-tically determined way, rela-tively to frame 1, by guide 7 ancl both s-trings 8 with regard to the preloading force in rod 37 and to -the measuring force in guide 42.
` , .
Fig. 8 shows a further variant to Fig. 5 and Fig.
; 7. The wire~shaped guide 24 of Fig. 7 is replaced by a traction rod :' :' ~, . .
"~ , i'''~' ~
. , ~
''' .' ' ~' ~ ` ~;' . ,' .
' ` ,"; "' ' : ~ , ~ ' ; ,' ` ' : :~ . , ' -- 9a -,:~.
,: .; ' , . , :
... .
47, which has as terminal joints at one end a pin 48 and at the other end a leaf-spring ~s9 laying in a vertical plane.
Furthermore, under fastening head 36 a single vertical guide 50 (instead of the two guides ~5, 46) is provided. The height of force distributor 6 is now statically determined by rods 37 and 47 and guide 50.
In the embodiments of Fig. 7, 8 guides 45, 46 and leaf-spring 44 of rod 37, resp. guide 50 and leaf-springs 44 and 49 do not serve for the statical guidance of force distribu-. . :
tor 6 with regard to the pre-loading force in rod 37 and to the measuring force in guide 24, resp~ in the rod 47. These elements serve only for the statical gu~dance of force distributor 6 in vertical direction.
Fig. 9 shows schematically the disposition of a straight ;
force distributor 6, its guiding organs and of *he force transmission elements of the scale. The straight horizontal ;
force distributor 6 is represented by its axis. The pre~
loading force is transmitted to force distributor 6 by a first transmission element 51 and the measuring force is transmitted by a second transmission element 52. Both forces ~ ~;
are vertical. For the statically determined guidance of :~
force distributor 6 with regard to these forces relatively to the not represented frame, four guiding elements are sufficient because the rotation of force distributor 6 around its axis is not considered. Both strings 8 and two guides 53, 54 being disposed in planes 55, 56 orthogonal to the axis of force distributor 6, serve as guiding elements. Guides 52, 54 are disposed horizon-tally in the same quadrant.
~ ' , ~; ' ... . . . . . . . .
~, . . . .
: : : - ' ' , ;':'`''' :-' ' ' : ' '''' , ' ' . ' , ~, , ~'~;' .
~OS~394 ::
String 8 ln plane 56 forms a smaller angle with the horizon-tal plane than the other string 8 in plane 55. The connect-ing poin-ts 57 and 58 of transmission elements 51 and 52 are not symmetrical wi-th regard to strings 8.
~'he pre~loading force is e~enlydistributed between .`'' ,~
' ,' ~ ' ':
:,. .
',` ' ' '~
" .~ ~ .
'`' ' ~:
`'. ~"" "-'~' ', '' ~' ' "'~, ~'i "~ -' ,.. .
.' '`'.. ~ .`~ ' . ' .
' .` ''' ~ , ': ,' `
.~, ,', ~ "
:' ~ ~; : i ' ' , :
', ",:
';'', ' ," ', . . .
., .
~'.'. ' - lOa -: :
' ' .
.
.,. ~ . .
. :, . . .
~,~S~36~ ' strings 8, the measuring force unevenly) e.g. in the propor~
tion 3 : -1. At -the same -time these -two forces acting on force distributor 6 are multiplied when transmitted to strings 8, the measuring force being more multlplied than the pre~loading force.
i' : , .
' ,:
:', :' '~: .
. ~ ,.
.:. . .
~, ., , ' '~
: ' ~
",.Z ~' ~
~ Fig. 7 shows, in a perspec-tive view, a variant of the ~ :
Z embodiment according to Fig. 5. Force distributor 6, guide ~, 7, both strings 8 and rod 37 are mounted horizontally. The weight of mass 14 is transmitted to force distributor 6 by means of a wire-shaped guide 42. Rod 37 presents at one end a pin 43 serving as a joint, and at its other end a leaf~
spring 44 laying in a vertical plane, also serving as a joint~
Furthermore, two verticaly guides 45, 46 are provided, which , determine statically, together with rod 37, the height of force distributor 6. Force distributor 6 is guided in a ~ _ g ' ~ :
''': ' , , ' -: ' ' ... .
~(~S~L3~
s-ta-tically determined way, rela-tively to frame 1, by guide 7 ancl both s-trings 8 with regard to the preloading force in rod 37 and to -the measuring force in guide 42.
` , .
Fig. 8 shows a further variant to Fig. 5 and Fig.
; 7. The wire~shaped guide 24 of Fig. 7 is replaced by a traction rod :' :' ~, . .
"~ , i'''~' ~
. , ~
''' .' ' ~' ~ ` ~;' . ,' .
' ` ,"; "' ' : ~ , ~ ' ; ,' ` ' : :~ . , ' -- 9a -,:~.
,: .; ' , . , :
... .
47, which has as terminal joints at one end a pin 48 and at the other end a leaf-spring ~s9 laying in a vertical plane.
Furthermore, under fastening head 36 a single vertical guide 50 (instead of the two guides ~5, 46) is provided. The height of force distributor 6 is now statically determined by rods 37 and 47 and guide 50.
In the embodiments of Fig. 7, 8 guides 45, 46 and leaf-spring 44 of rod 37, resp. guide 50 and leaf-springs 44 and 49 do not serve for the statical guidance of force distribu-. . :
tor 6 with regard to the pre-loading force in rod 37 and to the measuring force in guide 24, resp~ in the rod 47. These elements serve only for the statical gu~dance of force distributor 6 in vertical direction.
Fig. 9 shows schematically the disposition of a straight ;
force distributor 6, its guiding organs and of *he force transmission elements of the scale. The straight horizontal ;
force distributor 6 is represented by its axis. The pre~
loading force is transmitted to force distributor 6 by a first transmission element 51 and the measuring force is transmitted by a second transmission element 52. Both forces ~ ~;
are vertical. For the statically determined guidance of :~
force distributor 6 with regard to these forces relatively to the not represented frame, four guiding elements are sufficient because the rotation of force distributor 6 around its axis is not considered. Both strings 8 and two guides 53, 54 being disposed in planes 55, 56 orthogonal to the axis of force distributor 6, serve as guiding elements. Guides 52, 54 are disposed horizon-tally in the same quadrant.
~ ' , ~; ' ... . . . . . . . .
~, . . . .
: : : - ' ' , ;':'`''' :-' ' ' : ' '''' , ' ' . ' , ~, , ~'~;' .
~OS~394 ::
String 8 ln plane 56 forms a smaller angle with the horizon-tal plane than the other string 8 in plane 55. The connect-ing poin-ts 57 and 58 of transmission elements 51 and 52 are not symmetrical wi-th regard to strings 8.
~'he pre~loading force is e~enlydistributed between .`'' ,~
' ,' ~ ' ':
:,. .
',` ' ' '~
" .~ ~ .
'`' ' ~:
`'. ~"" "-'~' ', '' ~' ' "'~, ~'i "~ -' ,.. .
.' '`'.. ~ .`~ ' . ' .
' .` ''' ~ , ': ,' `
.~, ,', ~ "
:' ~ ~; : i ' ' , :
', ",:
';'', ' ," ', . . .
., .
~'.'. ' - lOa -: :
' ' .
.
.,. ~ . .
. :, . . .
~,~S~36~ ' strings 8, the measuring force unevenly) e.g. in the propor~
tion 3 : -1. At -the same -time these -two forces acting on force distributor 6 are multiplied when transmitted to strings 8, the measuring force being more multlplied than the pre~loading force.
i' : , .
' ,:
:', :' '~: .
. ~ ,.
.:. . .
~, ., , ' '~
: ' ~
Claims (7)
1. A mass and force meter comprising a frame, a load support, digital evaluation and display means mounted on said frame, two electrically excited, transversely vibrating pretensioned strings, each having one end fixed to said frame, a force distributor, the other ends of strings being connected to said force distributor, first and second trans-mission elements for transmitting to said force distributor a pre-tensioning force and a force depending on the load to be measured respectively, one end of each of said transmission elements being fixed to said force distributor, their other ends being operatively connected to receive their respective forces, means for applying to the evaluation and display means resultant frequency variations caused by the applica-tion of said loads to said strings for computation and dis-play of the magnitude of the measured load, characterized by a guide having one end connected to said frame and its other end connected to said force distributor, said guide and said strings guiding said force distributor in a stati-cally defined way relative to said frame with respect to said pre-tensioning force and said force depending on the load to be measured.
2. A mass and force meter according to claim 1, chara-cterized by that the two vibrating strings lie in a horizon-tal plane in which said first and second transmission elements and said guide also lie.
3. A mass and force meter according to claim 1 characterized by a first guide having one end connected to said frame and its other end connected to said force distributor, a second guide having one end connected to said force distributor and its other end to said load support, said guides and said strings guiding said force distributor in a statically defined way relative to said frame with respect to said pre-tensioning force - 12a -and said force depending on the load to be measured.
4. A mass and force meter according to claim 1, characterized by a pre-loading mass whose weight generates said pre-loading force, a two-arm lever rotatably mounted on said frame, having one arm substantially horizontal, said pre-loading mass being mounted on said horizontal arm, the second arm of said two-arm lever being substantially vertical, the other end of said first transmission element being con-nected to said second arm, the other end of said second trans-mission element being operatively connected to recieve said force depending on the load to be measured.
5. A mass and force meter according to claim 1, characterized by that said first transmission element con-sists of a rod having as joints at said one end a pin and at said other end a leaf spring mounted in a vertical plane.
6. A mass and force meter according to claim 1, characterized by that said transmission elements are mounted in the same vertical plane, at least one of said strings being mounted outside said vertical plane.
7. A mass and force meter according to claim 1, characterized by a second and a third guide each having one end connected to said lever and their other ends connected to the frame, a first knife edge on said force distributor and a second knife edge on said frame, a support mounted be-tween said knife edges acting as fourth guide for said force distributor relative to said frame, said fourth guide gor said strings guiding said force distributor in a statically defined way relative to said rame with respect to said pre-tensioning force and said force depending on the load to be measured.
- 13a -
- 13a -
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH413375A CH592870A5 (en) | 1975-04-01 | 1975-04-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1054394A true CA1054394A (en) | 1979-05-15 |
Family
ID=4270445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA249288A Expired CA1054394A (en) | 1975-04-01 | 1976-03-31 | Mass and force meter |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS51122465A (en) |
| AR (1) | AR205498A1 (en) |
| AT (1) | AT375185B (en) |
| AU (1) | AU499819B2 (en) |
| BE (1) | BE838292A (en) |
| CA (1) | CA1054394A (en) |
| CH (1) | CH592870A5 (en) |
| DD (1) | DD123768A5 (en) |
| DE (1) | DE2531672C3 (en) |
| FR (1) | FR2306435A1 (en) |
| GB (1) | GB1526489A (en) |
| IT (1) | IT1058415B (en) |
| NL (1) | NL163020C (en) |
| SE (1) | SE7601308L (en) |
| ZA (1) | ZA76777B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2966612D1 (en) * | 1979-09-19 | 1984-03-08 | Wirth Gallo Patent Ag | Device for measuring masses and forces |
| EP0352312A1 (en) * | 1988-01-22 | 1990-01-31 | Wirth, Gallo Messtechnik AG | Balance and process for calibrating and operating it |
| EP2746736B1 (en) * | 2012-12-20 | 2019-02-06 | F. Hoffmann-La Roche AG | System for managing of bulk liquids and/or solids |
| CN112595393B (en) * | 2020-12-11 | 2021-09-17 | 大连理工大学 | Modal localization micro-mass sensor with different-order modal coupling |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH469973A (en) * | 1967-09-25 | 1969-03-15 | Wirth Gallo & Co | Electric mass meter |
| CH492961A (en) * | 1969-02-28 | 1970-06-30 | Wirth Gallo & Co | Electric mass or force meter |
| JPS5038366B2 (en) * | 1972-06-12 | 1975-12-09 |
-
1975
- 1975-04-01 CH CH413375A patent/CH592870A5/xx not_active IP Right Cessation
- 1975-07-16 DE DE2531672A patent/DE2531672C3/en not_active Expired
- 1975-07-25 NL NL7508911.A patent/NL163020C/en not_active IP Right Cessation
-
1976
- 1976-01-01 AR AR262211A patent/AR205498A1/en active
- 1976-01-26 FR FR7602004A patent/FR2306435A1/en active Granted
- 1976-02-05 BE BE164111A patent/BE838292A/en not_active IP Right Cessation
- 1976-02-06 SE SE7601308A patent/SE7601308L/en unknown
- 1976-02-10 ZA ZA777A patent/ZA76777B/en unknown
- 1976-02-10 GB GB5153/76A patent/GB1526489A/en not_active Expired
- 1976-02-12 AT AT0099776A patent/AT375185B/en not_active IP Right Cessation
- 1976-02-25 AU AU11424/76A patent/AU499819B2/en not_active Expired
- 1976-03-12 IT IT21170/76A patent/IT1058415B/en active
- 1976-03-30 DD DD192117A patent/DD123768A5/xx unknown
- 1976-03-31 CA CA249288A patent/CA1054394A/en not_active Expired
- 1976-04-01 JP JP51035221A patent/JPS51122465A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| NL163020C (en) | 1980-07-15 |
| DE2531672C3 (en) | 1978-04-20 |
| ZA76777B (en) | 1977-01-26 |
| NL7508911A (en) | 1976-10-05 |
| ATA99776A (en) | 1983-11-15 |
| DE2531672B2 (en) | 1977-08-11 |
| AR205498A1 (en) | 1976-05-07 |
| CH592870A5 (en) | 1977-11-15 |
| AU499819B2 (en) | 1979-05-03 |
| DE2531672A1 (en) | 1976-10-14 |
| DD123768A5 (en) | 1977-01-12 |
| FR2306435A1 (en) | 1976-10-29 |
| AT375185B (en) | 1984-07-10 |
| IT1058415B (en) | 1982-04-10 |
| GB1526489A (en) | 1978-09-27 |
| BE838292A (en) | 1976-05-28 |
| AU1142476A (en) | 1977-09-01 |
| NL163020B (en) | 1980-02-15 |
| JPS51122465A (en) | 1976-10-26 |
| FR2306435B1 (en) | 1981-11-20 |
| SE7601308L (en) | 1976-10-02 |
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