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Патент USA US2412295

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Dec. M), 194,6,
P. A. SHAFFER, JR
MICROBURET
`
2,412,295
Filed Aug. '7, 1944
INVENIOA
PML/P A Smyrne-@Ä
Patented Dec. 10,
' 2,412,295
UNITED
‘
«STATES
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- 2,412,295
PATENT]
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>>Mlcltonvltrz'r
y
.
.
Pump
‘ California
A. snuffel-Jr.,
Institute
nsadenacaungassignerio
Research « Foundation.`` I
Pasadena, Calif.,y a corporation of
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lApplicatie”. August v_, 1944, sesamo. 548,323
10mm. `(c1.222---26>"_
,
vl
‘
-
eler member. I I. is provided inßtheformpr arela.
tively long cylindrical nut., Near‘fit's uppertend it
is provided with atransverseslity-IZ whichfis
ladapted vto be compressed bya tension‘screwïlß
My invention relates `to microburets vand
among the objects of my invention are:
First, to provide a microburet which makes pos
sible accurate measurement of liquids used'in
titration procedures and is particularly adapted
so that slack due to the thread clearance‘between
the traveler member II kand drive `s_crewß vmay
for use in conjunction with the analysis of ex
be taken up. In addition, the traveler Vis provided
with one or more longitudinal slits„I4 ltojform
tremely small samples such as used in micro
chemical procedures.
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segmental portions which may be spreadslightly "
changeably receives and operates glass syringes 10 so that the traveler member I I hasnoininal fric
tional engagement with the walls of ythebarrel ' I.
containing the various liquids used for titration.
One side of the barrel I isk provided with Aa
Third, to provide a microburet which, though`
longitudinal slot I5. A lateral stem I6 yissefcilred
accurately controlling the movement of the
in the .traveler member II and protrudes through
plunger into the cylinder of a glass syringe. places
Second, to provide a. microburet which inter
no side thrust on .the plunger so that the plunger 15 the slot I5. The lateral stem'fits into a socket
formed 1n slide bracket I1. The end of „the slide
bracket adjacent the barrel |` is curved intof'vcon
formity therewith and the slideA bracket' is secured
pact and easily operated.
`
to the stem I6 by a set screw IBL", One vertical
With the above and other objects in view which
of the slide ìbracket I'I is 'inscribed with a‘
`may appear hereinafter, reference ,fis directed to 20 side
reference marking which coacts witha microm
the accompanying drawing in which:
eter scale disposed longitudinally on the barrel I.
Figure 1 is a front view of the microburet show
Theunder »side of the slide bracketfisprovided
ing a syringe in position.
Y
y moves freely.
Fourth, .to provide a microburet which is com
f‘Figure 2 isa side elevational view of the micro
buret.
with a ball bearing I9 in order vto `form"afheini
25
spherical projection. This bears against >tl‘ieph'ead
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P-I of a plunger P forming part of a syringes.
Figure 3 is a fragmentary longitudinal sectional
vThe upper corners of the vslide"bracket `are
view thereoi taken through 3-3 of Figure 1.
notched along the` sides of kthe bracket .tofiorm
Figure 4 is a top view of themicroburet.
Figurev5 is a transverse sectionalview `thereof 30 shelves on which are mounted the leverV armsil) '
of retainer clips 2 I. The lever arms ‘are vj’o‘urrialed
taken through 5_5 of Figure 2 with the slide
at their endsy adjacent the barrel kIjjbyf screws.
bracket removed.
Figure 6 is a transverse sectional view .through
8_6 of Figure 2 showing the barrel and under
side of the travelerÍ member.
y
Figure 'I is «a transverse sectional view through
'I--l of Figure 3.
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The forward vextremities of .theglever arms-are
provided ¿with rudimentary yhandle lugs( .23.;11De
pending arms 24 extend downward frfmigthfev lever
arms 20 `and are providedwith> inturnedv extrem
ities 25 which fitundery they head kP-«I ofthe
plunger F. The retainer clips _2| areslightly flex
'A tubular barrel I is closed at its lower end by
ible but are strong enough 'to rsisethe'plunger' in ’
a. plug 2. The upper end of the barrel I receives
ball bearings aand 4. y The lower ball ybearing 3
cylindertoCthe
of the
"lower
syringe»`
side portion
l, »1 ,l , „of the barrel
rests on a shoulder 5 Within the barrel. A bush 40 theSecured
ing B screw threads into the upper end of the
I is a V-block 2B.` The V-block is providedlwith
barrel I and engages the upper bearing -4.`
a V-shaped groove adapted .toz accommodate -the
The bearings 3 and 4 ñt the stem portion ‘I of
cylinder of the'syringe and alìnerit `withthe .ball
a drive screw 8. The lower bearing is press fitted
bearing I9. Clamp arms 21` formed fof spring
on the stem portion 'I'and _abuts a shoulder 9.
Slight clearance is provided between the inner
race of .the bearing 4 and the stem portion. The
` upper end of the stem portion receives a head or
knob I0 for the purpose of rotating the drive
screw.
The head I0 includes a cylindrical por
tion bearing a micrometer scale which coacts with
a. reference line inscribed on lthe barrel I at its
upper end.
The tubular barrel I forms a guide means
which receives a traveler member II. The trav 55
material are secured to the Sides'ofthebarrel I
and extend laterally- along ` .the sides 'y "on/fthe
V-block. vTheir extremitlesfare inturned to gripl
the cylinder C and hold itinthe yV-groovebf‘f'l'wo
pairs of clamp yarms’ are provided'. y¿The V-block
and clamp arms thus form a holder for the'cyl- »
inder C of the syringe. Each pair of clamp arms
is connected by a screw 28 which extends through
a hole formed in the V-block 26. One end of
each screw is riveted or otherwise secured to one
2,412,995
3
tended end of each screw receives a nut 29.
4
member; a syringe plunger engaging bracket con
nected to said screw member; a syringe cylinder
of .thepair of clamp arms and the other or >ex
. ‘» f holder attached to said guide member; and scale
'I‘he upper end of the cylinder Cv is> provided
with a ñange C-I which rests against .the upper
means for measuring »the extent of movement of
end of the V-block so that when the cylinder is
said traveler andsyringe plunger.
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4. The> combination with a syringe having a
clamped it remains in place as the plunger is -
cylinderv 'and plunger, -of a microburet compris
moved downwardly therein. The clamp arrns` 21'
are suillciently stifl' to hold the cylinder against
ing: a tubular guide member; a traveler member
guided within said. guide member; a screw mem
upward movement when the plunger. is with- ._
l0 -ber for moving said traveler member; a syringe
drawn.
The barrel'is provided with a mounting stem V30y , . plunger engaging bracket connected to’said screw
-member; a syringe cylinder holder attached to
by. which the microburet may be lsecured in a
» suitable fitting cammed by a'ring stand or ’similarI \
' .sugport customarily used for chemical apparatus.
‘ saidV guide member; and scale means for measur
ing the extent o1' movement of said traveler and
Byîreason of the micrometer scales provided" on
syringe plunger..l '~ '
'
. 5. In a microburet for metering discharge o!
the" head lo anden .the barrel l the extent of. ,
fluid from a glasssyringe wherein the syringe
movement of the plunger in its cylinder kmay be
The ball bearing and spring clip engagement'v
includes a cylinder and Yplunger therefor, having
a head at its extended end, the combination of:
bind inthe cylinder dueto the snug‘iluid type. ,
barrel; asliding bracket secured to the protrud
accurately determined. ‘
v
between the slide bracket Hand the plunger P\ 20 a tubularbarreha drive screw rotatably mounted
in said barrel; atraveler for said drive screw
avoids the application of *side thrustv on the
equipped with a lateral projection, there being
plunger. This is highly desirable for leven a
any `accommodating longitudinaljslotk in said
moderate sidevthrust will cause .the plunger to
tit which is maintained between these two mem 25 ing end of said projection; a V-blo'ck’securedto ‘
bers.
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said barrelbelow said sliding bracket; yieldable
A
clamp elements on opposite sides of >'sind V`-block.
The syringe per se is conventional and inas
for holding the cylinder of a syringe,v against said
much as they are lreadily inserted and-removed
from .the V-block and slidel bracket several»- , V-block; and yieldable clips pivotally mounted on
- syringes containing different liquids used- in 30 said sliding bracket and having arms" adapted 4to .
`engage the >head of said plunger, wherebyjm'o've
titration procedures may be used interchange
ment of said _sliding bracket correspondingly
ably, and 1the syringes may be inserted and re
moved s'everal times as needed before their con
tents are discharged.
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moves said plunger in saidcylinder.
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‘ - y6. In a microburet for metering discharge of
iluid from'a glass syringe wherein the syringe'in
cludes a cylinder and plunger therefor, having a
head at its extended end, the combination of: a
.tubular barrel; a drive screw- rotatably. mounted
„ in said fbarrelya travelergfor said drive screw
40 equipped with a lateral `projection,'there being' an
I claim:
.
.
111A microburet comprising: a'syringe includ- j accommodating longitudinal slot in said barrel; a
sliding bracket secured tothe protruding end of
ing'a cylinder and a plunger movable therein and
said projection; a pairl of clips pivotally mounted
' provided with a head at its outer end; a tubular
The various changes and altem-ate arrange
ments may be made within the scope of the ap
pended claims, in which it is my intention to
claim all novelty inherent in the invention as
broadly as the prior art permits.
member having a slot in its side wall; a syringe - - on said bracket and having arms "adapted to
engage the head of said syringe and hold said
cylinder mounting means on said tubular member
head against the under side of said bracket; and
means for clamping they cylinder of said ysyringe
to the side of said barrel in alinement with said
below said slot for positioning said syringe cyl
inder in .offset parallel relation to said tubular
member; a micrometer screw »journaled within
plunger.
said .tubular member; a traveler member threaded l
on said screw within said tubular member; -and .
' a syringe plunger engaging bracket disposedA ex
ternailyoi said tubular member and attached
to said traveler member through said slot.
2. The combination with asyringe’cylìrider and
plunger of a microburetk comprising: va, traveler
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head at its extended end, the combination fof:
. a tubularbarrel; a drive screw rotatably mounted
guide member; means secured onv said guide mem
ber for removably receiving a syringe cylinder; a
traveler slidable on said guide member and in
cluding means for gripping the head' o1' a syringe
plunger; a screw for moving said traveler; a first 60
micrometer scale incorporated with said screw
and guide member; and a second micrometer
scale incorporated with saidtraveler and guide
i
7. In a _microburet for metering discharge'fof
iiuidyfrom a glass syringe wherein the syringe in
cludes a cylinder and plunger therefor, having a
in said barrel; a traveler for said Vdrive screw
equipped with a »lateral projection, vthere being
an accommodating longitudinal y.slot in said
barrel; a sliding bracket secured .to therprotrud
ing end of said projection; .a pair of clips pivotally
mounted on said bracket and having arms adapted
to engage the headof said’syringeand hold >said
head against the u-nder side of said bracket;
means for clamping the cylinder of saidbsyringe
member, whereby movement of said traveler and I to lthe side of said barrel in alinementîlith said
syringe plunger maybe measured.
65 plunger; a handle for said drive screw mounted
3. The combination with a _syringe having a
cylinder and plunger, of a microburet compris
lng: a guide member; a traveler member guided
thereby; a screw member for moving vsaid traveler
- at one end of said barrel; and micrometer scales _
/ for measuring movement of4 said handle and'said
sliding bracket relative to said barrel.
._
_Y ,
PHILIP A. sHAFFEnun.
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