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Патент USA US3047094

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July 31, 1962
Filed May 21, 1958
3 Sheets-Sheet 1
I I5
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July 31, 1962
Filed May 21, 1958
5 Sheets—Sheet 2
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H63 2
H6: 4
July 31, 1962
Filed May 21, 1958
3 Sheets-Sheet 3
FIG: 6
, $31165 atent; 0.
t I‘ Patented July 31.? ‘1962
face 3 at the top of the main pillar 4 of thetbalance. Two
knife edges'S, 6 atthe ends of the beam {support respec
tivelyi-a suspended pann‘7vfforpthe substance to be weighed
Toshio Chyo, 262 Kashiracho, Kamichojamaclii-Agaru,
.and a suspended scaling member 8 for counter-weights.
Nishinotoindori, Kamigyoku, Kyoto, Japan
Each knife edge 3, 5, 61's in contact with or separates from
, Filed May 21, 1958, Ser.- No. 736,844
its own receiving member by the vertical shifting of an ar
74 Claims. (Cl. 177‘—150)t
resting shaft 9‘which passes through the pillar 4. » ‘10 is-a
cam plate for imparting vertical shifting to the arresting
I This invention relates ‘to a weighing balance in which
counter-weights are automatically deposited on the scale
shaft '9, 11 is a‘ handle shaft for rotatingith'e cam plate 10
in accordance with the weight of a substance to be 10 and-12. is a knob forthef-handle shaft 11. .Thefhandle
shaft 11 hastalsoi two other cam plates 13, ‘14, which-en;
able thetpan 7 and the scaling‘ member 8 to be respec
tively supported by vertically displaceable arrester's 15, 16'.
at'the center pivot of the balance beam and tone at each
'end of the beam where'the, respective scales are hung.
I According to this invention, the ‘weighing pan 7 is sup
'When the balance is not in use these three knife edges are 15 ported by a holding member, a part of which is formed
detached from the respective receiving surface or the like
"with. an element'having electrical resistance. The electric
vto beist-ored in a disengaged position. In being used for
resistance'of the. elementv varies vin accordance‘with the
Usual‘ weighing balances possess threetknife edges: one
Iweighing‘andpafter the substance to be weighed is placed
weight oftthezweighing'material. 5 In FIGURE l'isshown
a suspender'l’l as the holding memberlof the weighing
ion’ a pan, the handle for disengaging the beam‘ is turned
to place theseknife edges in contact with thei'rrrespective 20 pan 7. t. The suspender V17,‘ islp'rovided with‘ an electrical
receiving members, so that the discrepancy ofgweight be
resistive element 18 connected toone end ‘of thesu'sQ
tween the substance to be weighed and the counter-weights
pendérflAs for the substance'of resistance ‘.18 anymzn
1 'may be-‘determined byiinclination ofpthe ‘beam under the
terial, as long. as it produces thetabovernentioned effect,
may be usedlt InVFIGURES v1, 2,.the resistance element
condition in which the beam is freerto' oscillate.‘
'inventionihas ‘among its objectsw'means to’deposit 25 consists ‘of a; U -shaped ?exible plate 19 between botht'ends '
automatically on the iscaletcounter-weights having approx
of whichiis inserted and mounted a resistance plate‘ 20
with azigz'ag shaped resistance wire 21.,’ 'A resistance wire
imately the same weight as ‘ that of the substance being
Weighed, ‘this being accomplished, before, the beam‘ is
such as one used'inaresistancewire strain meter is avail
able‘ for this‘purpose In ‘FIGURE: 3 a tube ‘of carbon
iloadedcand while the balance is‘, in its resting state. Ac
cording to'thisiinvention rapid weighing ‘is rendered pos 30 grains 22 is mounted in place of the ‘resistance plate 20 of
sible because the time of operation of the; apparatus ‘is
7 According2 toserve
to this invention,
as the resistance
an element
‘extremely shortened. In addition‘to' this, the knife edges '
may be prevented from wearing out and sensitivity and
accuracy ‘may be maintained fora long time‘
capacity ‘which-varies according to the ‘weight of the weighs
_ing rniaterialimay also be used instead of the above stated
_ In order to attain the ‘above object,_jthe weighing ibal: 35 electrical‘ resistance elements #18. FIGURE ‘4 shows _a
‘ancev accordingyto thisiinvention is provided with ‘an ele
_‘_U-shaped ?exible pl-atef19t'betwee‘n. both ends‘ of which
‘a condenser‘23tis inserted as an example off-this ‘arrange.
"ment having electric resistance or electric capacity which '
‘variest‘as a rfunctionof' stress produced by , loading, " and
I’? The operation of the apparatussaccordingto this inven-‘
"also-‘includes means for producing mechanical energy fac:
cording-tofthe electric resistance or electric capacityjot 40 tion ‘is as "follows: At the outset, theibalance'bearniz, the
saidelernent and meansifo-r. depositing ontheiscale coun
pant7i'for receiving ‘ the: substance to ‘be weighed ‘and, the
terfweights related'to and deposited by. said‘rnechanical , , scale memberIStforthecountenweights “are in-their rest-r
ing‘ positions respectively. “ In this‘ state‘a material tokbe
. eIl¢rgY-__.;
Qther objects;
of this
>17 invention
.~ .. 1willa appear . a from
:weighed is placedcn the tweighingrpan?. ,The handle
following speci?cation‘ and, the’ novel features 'will'rbe' par; 45 shaft ~1'1-iistthe‘n turned to ‘separate ‘the pan :7, and-the scale
member'8 from the respective arrestors ‘15,’ =16inorderto
ticularly pointed'out in theclaims attheiend thereof.‘ _ ' 7'
weighing balance according to
release them, while'the balance beam, z'isi'stilljsupported
on the. arresting shaft 9, the handle 11 having not» yet been
invention is illus
trated by wayjof example in the accompanying drawings,
in which}
'turnedlthrough 7a su?iciently large angle?‘ The tensile
‘j. FLGURE lrisa vfront View of a‘iweighinglbalancefac
cording tothis'inventi'ony
I i-IEIQUREZ shows a resistance ‘wiretaps an’ example of the ;
"arrangement byywhic/hpthe ‘electric, resistance varies ac‘
wfdins to: the applied'stressi and, which isused inithe' an:
forceapplied tothe Suspender 17 by the weight of thema
terial on the part7 .producesrtensile stress in the- resistance
element 18 or; a change in the charge on‘ capacitive ele
ment 2311f a ?xed volt-age is imposed across both ends of
theresistance ‘18, there is produced an ‘electric currentTpro-i
55 portionateito the weight cinemas-a1‘ on thegpan7. be-I
' v FIGURE‘ 3 shows: another exemplary arrangement ‘in
cause the electric resistance of element 1‘8'v'aries accord;
which the electric resistance tvaries" according to. thefap: 7 ~ 'ingito the weight of the weighing material. In theexam:
ples of, FlGURESl, 3 thefelectric resistance .variestrela
tive to the tensile stress or‘ strainiin the resistance wire 2-1
‘plied stress; ,
‘ ‘FIGURE Airshowsanjexernplary‘arrangementfiniwhich '
theelectric capacity varies according to the'appliedstress
and,'which may housed in the apparatus‘according to the
FIGURE 5 is ‘a diagrammatical ‘showing of an'app'ara:
tus for producing ‘mechanical "energy in accordance with
the electric resistance of the ararng'ement shown in FIG;
tric current of an amount according to the weight of the
load, counter-Weights .counter-poising roughlyithe weigh-v
loading the‘scale with counter-weights in accordance with
the mechanical energy which isVproduced-by the apparatus
Referring to the drawings,<a~knife~edgeiLatthetcenter
Intthelatter case there may also be obtainedllan electric
currentrelated to the weightof the~weighing~material.__ f
if _ According to the presentinventiomby producing elec;
‘FIGURE 6 is~ a perspective
view'of an7' apparatus
as shown-in FIGUR*E;5.,
or carbon grains 22, while in theexample otlFIGURE 4_
the'telect'ric' capacity varies relative t'olthe' tensile'strain in
the .condenserl?, this resulting from :the variation'of the
distancerbétween the two metal plates of: the condenser 23.
ing 'materialfare ‘automatically placed onto T'the. weight
70 scales: FIGURE 5 illustrates an apparatusr~for realizing
of the weighing beam 2 is supported by. a receiving sur- I 7,
the above effect‘byiway of example.’ 1 1
I l“ ,
At the‘ same ‘time "as; the ‘weighing pan ".7 is released
vfrom its rest position by turning the handle shaft 11, the
As already stated before, the weight manipulating shaft
switch 24 is turned on to apply an A.C. voltage to the
50 is connected to the rotation shaft 38 of therratchet
resistance 18. Though not shown in ?gures, the switch
wheel 34. The weight manipulating shaft 50 is, there
24 is connected to the handle shaft 11 so as to be turned
fore, automatically turned “by the effect as described '
on or off by its turning. The current produced thereafter Cl herein before, and consequently, on the weight scale 8
is inversely proportional to- the electric resistance of the
there are automatically deposited counterdweights roughly
element 18, which resistance varies relative to the Weight
counter-poising the weight ‘of the weighing material on
of load as described before. The current is ampli?ed by
the pan 7.
'an ampli?er 25 and transferred to an apparatus for gen
After placing on the scale counter-weights roughly
erating torque so as to rotate its shaft 26. The rotating 10 counterpoising the weight of the weighing material as‘
shaft 26 is provided with a rotary ‘arm 27. Accordingly,
stated above, the handle shaft 11 is turned to release the
the rotary angle of the arm 27 is proportionate. to the
arresting shaft 9 by the rotation of arresting cam 10,
electric current intensity produced. The arm 27 serves
as a contact-maker for ‘a number of contact points 28,
which are arranged in order in a circle around the rotat
ing shaft 26. Each time the contact of rotary arm 27
touches one of the contact points 28, a circuit 29 com
until the balance beam 2 is released completely from
resting, each knife edge 1, 5, 6 being in contact with its
own receiving surface or the like. In this instance 'vibra
tion of the ‘beam 2 is not so large because approximately
point 28, the armature 32 returns to its original position >
by the force of a spring 33. When the armature '32
same weight
is loaded
at the
is performed
both ends ofbythe
the angle of inclination of the balance beam 2 which is
caused by the small difference of weight between the
weighing material and counterweights. The optical mag
nifying system may preferably be used for measure of
the angle of inclination. 54 in‘FIGURE 1 is an optical
reciprocates one stroke, a ratchet 34, which is provided
scale which is provided at one end of the beam 2.
at such a position as to engage with the pawl 35 of the
armature rod 36 during the attracting stroke of the arma
mm 32, moves one ratchet angle. The ratchet wheel 34
is constructed as an irreversible mechanism. The rotary
angle of the ratchet wheel 34, therefore, is in proportion
It will be easily understood from the above descrip
tions that the present invention provides the ‘great ad
vantages of extreme shortness of weighing time and
mitigation of deterioration in precision which is caused
by wear of knife edges or by distortion of the balance
to the number of times the armature reciprocates, it is
beam resulting ‘from long weighing operations.
prising the contact points 28‘, a relay 39, an electro-mag—
net 31 and, the rotary arm 27 is closed, and thereby an
armature (an iron piece) 32 is attracted to the electro
magnet 31.
As soon as the arm 27 moves off a contact
thus related to the rotary ‘angle of the arm 27, and con
This invention in its broader aspects is not limited to
sequently, to the weight of the substance to be weighed.
the speci?c combination and improvements described, but
37 is a switch for the circuit 29, which is closed in op
The rotary shaft 38 of the ratchet wheel 34 is connected
departure may be made therefrom within the scope of
to the weight manipulating handle shaft. The shaft 38
chief advantages.
the accompanying claims without departing ‘from the
principles of the invention and without sacri?cing its
itself may also be used as the manipulating shaft. Ac
What I claim is:
cording to this invention, there is thus provided an ap
1. In weighing balance apparatus, the combination
paratus for placing on the scale counter-weights having
with a balance beam, and ?rst and second scales for re
a weight related to the turning angle of the weight ma 40 ceiving the substance to be weighed and for counter
nipulating shaft this placing of weights being accom
weights respectively, of an electric sensing device re
plished .by vthe turning of the manipulating shaft. As
sponsive to the weight of said substance, said sensing de
for the apparatus for manipulating counter-weights, any
vice including a strain vgage operatively associated with
one of well-known mechanisms may be used. FIGURE 6
' said ?rst scale and having an electric parameter which
illustrates means for manipulating counter-weights by
is responsive to said weight of said substance during
way of example, which is one of already-known mech 45 the condition when said balance beam. is held at rest,
means for holding and releasing said balance beam, drive
39, 40,8 each
for countenweights
of which is provided
of ‘ ' means responsive to changes in said electrical parameter
and means operative to cause the output of said drive
several V-shaped dents 41, 42 for the ‘respective ring
weights v43, 44. Each ring weight 43 is hung by a hook
45, which is supported by its own manipulating lever 46.
Each manipulating lever 46 at one end is pivoted on a
single shaft 47 so as to turn around the shaft 47. These
means to deposit counter~weights roughly equal to the
weight of said substance on said second scale before the
balance beam is released from its rest position.
2. Weighing balance apparatus according to claim 1,
' in which the strain gage comprises a U-shaped ?exible
manipulating levers 46 are provided at their substantially
plate with a resistance element between its ends, the re
middle point with respective pins 48, which are always 55 sistance element being provided with a resistance wire.‘
in contact with respective earns 49.
These cams 49‘ are
mounted on a single shaft 50. This shaft 50 is the weight
manipulating shaft. 51 is the knob of the manipulating
shaft '50.
When the manipulating shaft ‘50 is turned, some of
’ manipulating levers 46' move upward to disengage the ring
weights 43 from the scale ybar 39 while others move
3. A weighing balance according to claim 1 in which
said sensing device includes a cylinder containing carbon
grains and said parameter is the resistance of said grains.
4. In weighing balance apparatus, the combination
with a balance beam and ?rst and second scales for re
ceiving the substance to be weighed and for counter
weights respectively, of an electric sensing device re
downward to deposit their ring weights 43 on the scale
sponsive to the weight of said substance, said sensing
bar 39, this being accomplished by the operation of cams
device including a variable capacitor operatively asso
49. The number of the ring, weights which are‘ deposited 65 ciated with said ?rst scale and having a capacity which
on the scale 39 depends upon the angle of the manipulat
is responsive to said weight of said substance during the
ing shaft 50 since the several cams 49‘ have different
condition when said balance beam is held at rest, means
phases and forms with respect to each other. The same
for holding and releasing said balance beam drive means
mechanism as stated above is also applied to the lower
scale. 52 and 53in FIGURE 1 show respectively hooks 70 responsive to changes in said capacity and means opera
tive to cause the output of said drive means to deposit
for the ring weights 44 for the lower scale 40 and their
counter-weights roughly equal to the weight of said sub
own manipulating levers. The manipulating shaft (not
stance on said second scale before the balance beam is
shown in FIGURES) for the lower scale weights is con
released from its rest position.
nected with the upper manipulating shaft 50 as by gear- '
ing so as to turn at the same time.
(References on following page)
References Cited in the ?le of this patent
Becker ______________ __ Mar. 10, 1885
Elliott ______________ __ June 12, 1945 5
Emery _______________ __ Apr. 15, 1947
Howe _______________ __ Apr. 19, 1949
Lauler ______________ -_ Oct. 16, 1956
Whitcroft ____________ __ Nov. 5, 1957
Great Britain _________ .._ Nov. 25, 1936’
Great Britain ________ __ Nov. 18, 1953
Germany ____________ __ Mar. 21, 1957
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