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Nov. 5, 1946.
s. ROSEN
’
2,410,552
MEASURING DEVICE
Filed Nov. 20, 1944
Y.
.
„Foa
lH\Il,._‘Tl
ßdízwyßabmmvrok. í
Patented Nov. 5, 1946
21,410,552
UNITED STATES PATENT *OFF-ICE ~
2,410,552
MEASURING DEVICE Y
Sidney Rosen, Baltimore, Md.
r
Application November 2o, 1944, serial No.'5s4,244
10 claims. (C1. 222-209)
Thefpresent invention relates to new and use
ful improvements in measuring devices for use
in >connection with pipettes or similar appliances
core >Iii-when the plunger 5 is in normal position
and not acted upon by finger pressure. The par
ticular importance of this-spring will become ap
parent as the >description progresses.
for collecting and transferring liquids, and has
special reference to improvements in a measur
5 ,
ing device for drawing a liquid into and effecting
its controlled discharge from the pipette.
One object of the invention is to provide a
measuring device of this character which may be
easily operated to draw a desired volume of liquid
into the Dipetteand to eiïect the discharge of
any desired quantity with a high degree of.
accuracy.
i
y
Another object of this invention is to provide
a measuring device of the stated character 'where
by the whole or any predetermined portion of
the liquid drawn into a pipette may be discharged
Sufficient clearance is provided between >the
plunger and the bore of the upper casing section
to permit the free'passage of air between, the
bulb, the.. bore ofthe Vupper casing section and
the atmosphere. The spring 8 seated in the
_plunger .cylinder is kept Yin a-state of compres
sion, as hereinafter described, by the action of
the piston or plunger 9, which has a sliding ñt.
inv thev plunger cylinder. The degree of com
pression> of the spring is regulatedby adjusting Í ,
screwglß and adjusting nut II I which latter also ,
serves asa stop for the movement of the piston
9 into the plunger cylinder. The >adjusting screw `
' bears directly von the valve stem I2 of the pneu
Still another object of this invention is to pro
matic type .valve I3. The latter is the self-con
vide in a measuring device of this character a
safety trap for'restricting the flow of any liquid 20 tained type having an inner spring whichnor- .
mally exerts suiiicient pressure to seal the seat
from the pipette into the mechanism of the meas
ingsuriacesj. The valve body I II acts as a hous
uring device herein described.
ing'for the valve core and alsoserves to couple
With these and other objects'in view, which
the upper casing section 2_ toÍ'the lower casing
will appear in the course of the subjoined de
scription, the invention consists of the novel fea 25 section I5. "Ifhe normally closed valve core acts '
with ease and facility. '
,
tures of construction, combination andy arrange
ment of parts hereinafter fully described and
claimed, and .as shown in the accompanying
drawing in which:
'
'
Figure 1 is a front elevational view of the meas
uring device herein described.
V
.
Figure 2 is a central vertical longitudinal sec
as a seal between the bores of the upper and
lower casing sections vuntil the plunger 5 is acted
upon by' finger pressure.v Bailie. plate I6 serves
to‘arrestthe passage of any ñuid that may acci
30 dently be drawn up from the pipette.
A re
silient sleeve> I8 ñts into the lower casing section
I5 and serves to couple the pipette 8 to the meas
uring device and form an airtight seal there
with. Chamber I1 'acts as_a receptacle for any .
liquid that may unavoidably flow past the baille
position of the parts whe measuring off a desired
plate into chamber I'I. The baille plate checks
quantity of liquid.
`
'
the velocity of the liquid and reduces the amount
Figure Bis a central vertical longitudinal sec
whichvmay'enter the chamber I ‘I and prevents
tion through the device, showing the position of
the parts when drawing liquid into the pipette. 40 the liquid from jetting up into valve I3 and in
terfering with its operation. If desired, the
Figure 4 is a top plan view of the device.
chamber I'I may be ñlled with some absorbing
Referring now more particularly to the draw
substance to absorb the entering liquid or vapors
ing, the device as disclosedvtherein comprises a
therefrom when vaporous liquids are being meas
bulb> I, of 'rubber or other suitable resilient ma
ured so as to prevent the passageY of the vapors
terial, having a single opening. This is attached
tion through the measuring device constructed in
accordance with the invention and showing the
to an upper casing section 2 by means of a cou
pling 3 provided with ,bore 4 which permits the
passage of air'between the bulb and the upper
casing section. Loosely ñtted in the upper cas
ing is a plunger 5. ,_ Normally,
the projecting edge>
6, of the plunger bears against the inner project
ingedge 'I of the upper casing section, under the
~ into the mechanism of the measuring device.
The parts `which I choose to call ,the Vernier
portion of the measuring device include
lthe hol
low plunger 5, spring 8, plunger sleeve or
piston
9, adjusting screw I IJ forming a plunger rod or
stem threaded into' the sleeve, and adjusting nut
I I. As hereinafter described, this combination of
parts in conjunction `with the remainder of the
mechanism, enables Vthe operator to measure off
the smallest quantityv of liquidr with extreme'
eifectof the pressure exerted by the spring 8.
The. pressure~exerted by this spring is such that
it is'not suñîcient to unseat, i. e. open, valve v5.5 accuracy.
andere
To measure oil any desired quantity of liquid
If the spring 8 is eliminated and finger pres
sure is transmitted directly to the valve core
from the pipette the plunger 5 is depressed so as to
apply pressure to the valve core stem I2 through
spring 8 and piston 9. To effect rapid discharge
stern I2, accurate measurements become diffi
cult and uncertain, depending upon the appli
of the liquid the plunger 5 is depressed suîûciently
cation of a very precise amount of linger pres
so that it seats on the adjusting nut I I, the finger
being so placed on the plunger that a portion of
the recess 2I' is left uncovered and open to the
sure and a‘slight movement of the operator’s
ñngersince the liquid in the pipette is subjected
to atmospheric pressure as soon as the valve
atmosphere._~ The liquid - ‘mayy alsogîbe f discharged
unseals. Thisïdiiìculty is especially 1- apparent;`
when using .the smaller ¿size pipetteslwherefthe _
byvcoimpletely depressingfthe plunger'so as to
seal off recess 2|' from the atmosphere and col
slightest excess motion of the plunger causes a
lapsing the bulb. The liquid Will thus be forced
rapid downward movement of the liquid in thai4
,Y _out under> pressure.
` F-rom»~~the foregoing description, taken in con
pipette. By applying ñnger pressure throug‘hmtlfreHV
medium of spring 8, the operator can applysmall»
f nectionwitliothe drawing, the construction and
mode of use` of the device Will be readily under
increments of pressure through a distance oiapïv g
proximately 1A; inch depending on the size oi -spring Y
stood-without ar-îurth’errand extended description.
used, so as to produce more orlrless »airhleakage »l
past the valve seat and so produce a slow,or rapid, y
The_advanliages of this novel and improved con
structionoi pipette control are that it enables the
movement of the liquid level in the pipette.
In’assernbling the measuring device the tension
of`»f~s'pring§„__8?-or_`i_
Y
"
`
operator to_measure ofi small _quantities of liquid
from a pipette with‘extreme ‘accuracyg'lthe tubular
20
Constrllstipp _permits 'it toghe _held _assureur/hik;
performing _any 'manipulative-action; 'liquid jacf’
Y
by‘ means -of Screw' I0 andinut;L I yI Èsoïthat" leakage 1
- is impending before the applic tionïofsflnger pres
cidently i drawnv up _ intol jthe p control' device'A isA re-ìv
surex _i.ue.,4 _sor thatpîthe closing ¿presmsurefoff ¿the
Sprirrstof _;"al've ‘351s almost deepening
'beheerders-:said
valve» is ral-most- atv Kthe point` andi Willi"
y
a
slightj‘downwardfmovement>
of;> _
be, ‘Qeëfle
__
tripple.;
er: ’The Sensiiinwof. the valvetò spes-ç.
Strißteriçfrom flowing ¿into _and _îdarrlasirìa~ßhef
mechanism'.V
`
Y
'
-
-
_
‘
While- the construction disclosedis- preferred’ìit‘ "
is tothe' illndersiwd'tp tithesirlvemîon’ iSj "not lim?
ited thereto;V and'rthatî‘changes in -the A form; j_cgn;V
structionjand,arrangement of parts rnay__beïrnadej;r
insrmelrmeri's
this ìppreased- arid-the _vali/_e 'render~eduui¢kfc1osf . 30
Within-trie 'scope 0f theappended ßlaimsïwithout;
i11s-_¿_whe?iSushiriressilreisnsremered ' The ,presi »
departing from the spirit" or sacrificing ` any Vof¿_
they advantages ,oîtheinvention-~
rldstoalmpst balance .thè'l‘
tairleiîisprineìn therapie;
core-_ `Iffihaifaivs;lcoreßtem. „is _mit
preiv _
loàd'r?diapmñ?lger pressuregis' appliedsthe plight
movement‘oitheî lohvverr'valve 2I'; upto the_timei`
th @etage essere _dil .lares ._Sufi13èieptfeîr1to,
_
'
'
l
1. 'Iri'ameasilririerleripe~for_use_inicprinectipn i
with a: pipetteiagtph " _a 'hulp ingopen. _communica-,l
tion^~with theA tube ’ and’withgïthe ‘atmosphere `„
through the _upperend oisaid'tubefmeaps. atéthe `
lowerßrlriiuìsaidiubp tareceiyezand?formf a sealA
Orlasrld' ,Orgîthej pl‘lpetteL »__a _b file_platefapd‘ ‘
cause; 'n appreciable, _chapeei- _ingithegjlereliof ‘the `_4a "with"
@harp _er :Within ¿Sale Truhe, tofirestript the _ñòwßofiî '
liquid therein; a normiallyjjclosedfyalve interposed `
bet-weep the bulb“ arldt _e pipeti'eftcïfseal poneerld'l ’
of the .tube „ironic the _»_other _ 'andm'a _jplungerN'colme~
llf _trieliquioliyullibefduud_mueve :
The use' 0i what;
j
`
prisme, an Linnen plunger memperlbearipe ¿pppn _
saldi/alia a spripapearine _nutrie inner plunger "
manine; >and anjouterplupger; member ñrelatively j
liliç_:ulltiesg?andrV permits „micrometric _
metterla t0 .L and ‘adaptedito 1 trapsmìtí motion; '
measurementsto: bemedelwithîease and facility.;
Measurementsfiasf clOÍSe
`
through-‘the spring to the inner plunger memben',
Said _puter plunger mpmberextendinsíbeyond_the'
v
mill tell: _can gbenmadelwîthï @graduated _spa
tent _milliliter pipette.. _’
top’of the tube' so as_tobe'V manually actuatable
i
and _to Venable - _a _ringer ._pf.
tarreßusly _depress the; Saidputer plunger member _
55
andlsealthe Upper; end. _Ofjthie‘ tube'0parli-rief;y
2-5 A_iprecisiepïmeaslirine _dev_íßeï 0i thechar;
acter described," for 'use in' connectionjwithjja'
pipette ,aprìßomprisíne-ìn combìnatîprrja :resilient
bulp‘havipg, _a _single-_opening _SQ ,placedgin imita-1 .
positippto _a manually ¿controlled _valve as' to. per-1
mit the ñonof _air alternately. _between tllegloulb"Y
and Vthe atrrlosphere,l _the bulb; _andgthe __pipette,
the
pipette. _ar1d__ the atmosphere,
applvinasmallílïßrements
,of pressure
_andmeansgíór
tol the‘valv’ie
_ rertlyty tp _ thelvalre „core st_elnmlïhv thus _ opening _1
thérelve eempletelyapd plaßinethesmele, Open: _
_,Wîihfthe.
me rof- the pulp,'înfopen_ :communication
y
boreipf ¿the ,pipette _While _sealing-_the V.0pfrr1ìna~_Olli 65
from theatmospnhere,`-Y Thel bulbisgthen permitted
to Ídiste'nd untiljjthe idesired amountof liquid -has„__
been drawn _upgintoñ` the » pipette. At _ this; time( the
plunger` „5 gisreleased, isealing _offjthe _boreof _the `
pipette from; the bulb _andthe atmosphere ,and
- stopping the ,flower ,the _liquidinto-_the pipette! _»
consistingpf _ an inner' _plunger .member'ïop openf’..
ine _arldßoptrpllìpg _the Closing; mol/__ementlbf, theL
valve', 'an _outer manually: joperable' pluneenmeme r
_
bemand en_-spring _between Saidinnepand‘ puter;
'
plunger members forgtransmitting motion„fro_mj^
thelatter -_tothe former;
‘ "
p
33A; precision
measuring: devicapithè‘phare’ 1~
acterf described,._for „use_„jn connection _With,"a,",_
pipette __and vcornprlslng,„in ` con),binfation»v a `ilîesil
The_gßapillarylower -`end.. ofthe pipette prevents
ientwbulbjhaving‘a _singleî opening‘lvcommunica
the level of the liquid> is thus maintained fontina"l
75 'beiri'gïopen to the atmosphere through oneend `
tht «lim-‘idr already-@draw up._;fromg,esceplngßnq
the? manipulative action.
-
^-
maplin a _tube and _attached mera-furthe _bulb f
2541.9;552. i
0f, $11.011; .tube the .-Oilierfend» being adapted. t0 ,be
liquid _by¿ suction -fin'toV ltlie'dother end’mof saidÍ
connected to„one end_,of ajpipette for-drawing.
pipetteanormally _closed ívalve within said tube, ,
andja manually actuatable spring loaded plungerV
extending'through an opening in the top of> the
tubeto enable annger of theoperator to simul
taneously depress the
’
cover. said opening. .`
v.4. „In ameasuring devi'cefor use in connection
with apipettathe hcombination'withv a sl'ictinon;v
bulb, a` tube having means at one end >for con
necting with one end of a pipette, yafspring«closed
valve contained within thetube for regulating the.l
charge and discharge of air from the bulb and
pipette,-¿a spring loadedv plunger for imposing
on the valve an'opening pressure below but nearly
balancing the closing pressure of its spring, and
means for increasing the pressure of the plunger
on the valve and thereafter relaxing such pres
sure.
l
5. A precision measuring device of the char
acter described for use with a pipette or the like
comprising a casing having an air passage eX
tending therethrough, means at the lower end of
the casing for holding one end of a pipette con
nected thereto and in communication with the
sage, a suctionlbulbç .communicating with the pas- _
sagewadja
*_ l
o_¿the'opposite en_df‘oäffthe'cas'ing,
a normally...
clos
'
v
l Aed'lvalve'~in
saidfpas's'agebetween
the.-pìläetfíQ-andgbulbfand(means at the secondf
`erit‘îlfof thecasingfor
.na“ A
'
controlling'said valve, y
A* I Vyveans,'comprising vain-,inner plunger member.
formed >Íofv afsleeveandA a >rló'd'v in I.thre'eade'd adjust- '
able Íengageme?t. therewith, .- ‘saidr member being]
normalàlyin engagement vwit'lfl'the valve and mov- '
ablednwardlyto 'open vthe, valve and outwardly to/
permit it> to close, an- outer plungerv member
projectingëinwardly.
of and outwardly'beyond said
_ l
end of vthe casing andtelescopically engaging'the .
inner plunger‘membenanda spring disposed be;
_,?tweensaidiplunger member
I
i hold?
v_
s _iorjnor'mally
ing the .'outerplunger member outwardly projected l
and permitting it to'be Vforced inwardly to open'
the valve and to be controlled on its outward
movement in conjunction with the spring by an
20 operator’s linger, said spring forming a yielding
motion transmitting connection between the
plunger members whereby the inner plunger
member may be operated to open the valve to
different degrees and controlled to regulate the
valve closing movements.
8. A precision measuring device of the char
acter described for use with a pipette or the like
passage, a suction bulb communicating with the
comprising a casing having an air passage, means
passage in proximity to the upper end of the
at one end of the casing for receiving and hold
casing, a valve in said passage between the pipette
and bulb, and a plunger device at the upper end 30 ing one end of a pipette and connecting the same
with the passage, a suction bulb communicating
of the casing for controlling said valve, said de
with the passage in proximity to the opposite end
vice comprising a plunger member movable to
of the casing, a normally closed valve in said
valve opening and closing positions, a plunger
member projecting outwardly beyond the upper
end of the casing, and a resilient motion trans
passage between the pipette and bulb, and means
35 at the second named end of the casing for con
trolling said valve, said means comprising an inner
plunger member having an adjustable valvev en
gaging element and movable in opposite direc
6. A precision measuring device of the char
tions to respectively open the valve and to permit
acter described for use with a pipette or the like
comprising a casing formed of upper and lower 40 it to close, an outer plunger member projecting
inwardly of and outwardly beyond said end of
sections and having an air passage, a hollow
the casing, means for adjusting the adjustable
coupling detachably uniting the casing sections,
valve
engaging element of the inner plunger
means at the lower end of the lower section of
member, and a spring disposed between said
the casing forhreceiving and holding one end of
mitting connection between said plunger mem
bers.
a pipette and connecting the same with the pas
sage, a suction bulb communicating with the pas
sage in proximity to the upper end oi the upper
section of the casing, a normally closed valve
plunger members for normally holding the outer
plunger member outwardly projected and per
mitting it to be forced inwardly to open the valve
and to be controlled on its outward movement in
mounted in the coupling and disposed in said 50 conjunction with the spring by an operator’s'
linger, said spring forming a yielding motion
passage between the pipette and bulb, and means
at the upper end of the upper section of the cas
ing for controlling said valve, said means com
prising an inner plunger member movable in op
posite directions to respectively open the valve
and to permit it to close, an outer plunger mem
ber projecting inwardly of and outwardly beyond
the upper end of the upper section of the casing, .
and a spring disposed between said plunger mem
transmitting connection between the plunger
members whereby the inner'plunger member may
be operated to open the valve to different degrees
, and controlled to regulate the valve closing move
ments.
9. A precision measuring device of the char
acter described for use with a pipette or the like
comprising a casing having an air passage, means
bers ior normally holding the outer plunger mem 60' at one end of the casing for receiving and hold
ing one end of a pipette and connecting the same
ber outwardly projected and permitting it to be
with the passage, a suction bulb communicating
forced inwardly to open the valve and to be con
with the passage in proximity _to the opposite
trolled on its outward movement in conjunction
end of the casing, a spring closed valve normally
with the spring by a ñnger of the operator, said
spring forming a yielding motion transmitting 05 held in closed position by its spring and disposed
in said passage between the pipette and bulb, and
connection between the plunger members Where
means at the second named end of the casing
by the inner plunger member may be operated to
for controlling said valve, said means comprising
open the valve to different degrees and controlled
an inner plunger member normally engaged with
to regulate the valve closing movements.
7. A precision measuring device of the char 70 the valve and movable in opposite directions to
respectively open the valve against the action of
acter described for use with a pipette or the like
its spring and to permit it to close under the
comprising a casing having an air passage ex
action of its spring, an outer plunger member
tending therethrough, means at one end of the
projecting inwardly of and outwardly beyond said
casing for receiving and holding one end of a
pipette and connecting the same with the pas 75 end of the casing, and a spring disposed between
said plunger members for normally holding the
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