close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3039513

код для вставки
June 19, 1962
M. |_. GOLDBERG
3,039,500
PIPETTE FILLING AND LIQUID DISPENSING DEVICE
Filed Jan. 22, 1959
INVE NTOR
MOSHE LEVY GOLDBERG
DEZSOE STEINHERZ
ATTORNEY.
3,039,566
T nie
Patented June 19, 1962
2
1
3,039,500
PIPE'I‘TE FILLING AND LIQUID
DISPENSENG DEVICE
Moshe Levy Goldberg, 8 Jabotinsky St, Tel Aviv, Israel
Filed Jan. 22, 1959, Ser. No. 788,409
4 Claims. (Cl. 141—26)
My invention relates to devices for dispensing liquid in
drops or in small quantities, and, more speci?cally, to de
l-a device similar to that shown in FIG. 1, including a .
valve of modi?ed structure.
Identical parts are denoted by identical reference sym
bols in the various ?gures.
The embodiment shown in FIG. 1 comprises a pipe
generally denoted 1, which has a part 2 ascending in the
drawing, an end part 3, and a bent part 4 connecting the
parts 2 and 3. These pipe parts 2, 3, 4 may preferably
form a unitary U-shaped tube member.’ End part 3 has a
vices which discharge liquid from a pipette ?lled by suck 10 cross-section widening toward its outer end, as shown in.
as
ing liquid from a bottle or the like.
FIGS. 1 and 3.
Objects of my invention are to discharge the liquid by
its own weight under normal atmospheric pressure where
by the liquid will ?ow more evenly and slowly than it
?ows when ejected by pressure, thereby to increase the
A resiliently compressible bulb or ball 5, consisting of
rubber or other equivalent plastic material, is a?ixed to
the lower end of the pipe part 2. The interior of this
bulb communicates with channel 6 which extends through
the entire pipe 1. An opening 7 provided in pipe part 2
accuracy of observation and measurement of the dis
near the bulb 5, connects channel 6 with the open air.
pensed liquid, to regulate the ?ow by admitting air to the
Said opening 7 can be closed air-tight, for example by a
upper level of the liquid through small openings, to make
ball-shaped closure member 9 which is carried by an arm
possible selection between the discharge in small single
drops and a somewhat quicker discharge, to avoid the 20 8 that is pivotally mounted in a protuberance 10 on the
outer surface of the part 2 adjacent the lower end of the
necessity of cumbersome and time-consuming adjustment
part 2 where it is a?ixed to the bulb or ball 5.
during this selection, to make possible quick succession of
A little above the opening 7, the pipe 2 has a lateral
?lling and discharging operation, and thereby to provide
extension forming a small housing 11. The pipe chan~
a device adapted to discharge liquid immediately after
' nel 6 is connected with said housing 11 through an open
sucking it into the pipette.
ing which can be closed by a valve by advancing, by
I have found that these objects and advantages can be
turning, the valve stem 12 until it comes in contact with
obtained by a combinationwhich comprises air inlet open
the registering surface of a partition 13 provided in chan
ings and one or two valves, which can be opened and
nel 6 of tube part 2. The valve has a threaded stem 12
closed in the manner described hereinafter. The arrange
30 which passes through the outer wall of the housing 11
ment of these elements will be described later.
and can be advanced by turning button-like handle 14
Other objects are to af?x the pipette to a pipe, through
ai?xed to the stem. In the drawing, the valve is repre
which the sucking of liquid into and discharge of liquid
sented in simpli?ed manner, and its details may be con
from the pipette is effected, said pipe having a design
structed or designed, in conventional manner.
adapted to attain certain advantages. One of these ad
The widening end 3 of the pipe is provided ‘with a lin
vantages is to make possible a compact or short shape of 35
ing of rubber, or the like, 15 which is affixed to the tube
the device despite the fact that the pipe must have a cer
in suitable manner. For example, the lining 15 has an
tain length in order to accommodate the above mentioned
extension 16 which reaches out of the pipe about its rim
elements whereby storage and handling of the device is
and is bent to engage the outside of part 3.
facilitated. Another advantage is that the pipette can be
A pipette 17 has an upper end tightly inserted in the
located so near to these elements, that its graduation can
be conveniently observed during operation of the latter.
Further objects are to facilitate the removal of liquid
from the pipette, and to provide, if desired, an opening at
its upper end, through which discharge of the liquid can
be effected.
Still other objects are to af?x the pipette to the pipe
exchangeably and air tight, to provide, for this purpose,
the pipe with a Widening end and with a rubber lining of
this end, and to facilitate attachment and exchange of this
lining.
Still further objects are to provide additional means for
holding the pipette in proper position, and to make pos
sible quick and easy attachment to and detachment from
these means.
Still other objects are to attain these results with simple
and reliable means, and to provide a structure that can
be inexpensively made and easily operated. Still further
objects and advantages will appear from the following de
scription of some speci?c exemplifying embodiments of
my invention, from the appended claims and from the
lining 15 whereby this pipette forms a continuation of
the pipe channel. The pipette is held disengageably and
exchangeably in the lining by resilient pressure. Pref
erably, the pipette is secured in proper positionaddi
tionally by a clamp comprising two resilient arms 18.
The device shown in FIG. 1 is preferably operated in
the following manner:
,
With valve 12 closed and closure member 9 in open
position, the rubber ball 5 is compressed by the oper
ator’s hand so that the air is expelled from the rubber
ball.
Opening 7 is then closed so that the rubber ball
remains in compressed condition. The free end ofthe
pipette v17 is now dipped into the liquid to be dispensed,
valve 12 is ?rst opened to the desired extent, and is closed
again when the desired amount of liquid has entered the
pipette. In order to discharge liquid from the pipette,
?rst closure member 9 is shifted in order to open opening
7 and liquid can be then discharged by opening valve 12
to an extent at which the liquid ?ows with the desired
speed from the pipette.
accompanying drawings which show, by way of example,
The modi?ed embodiment of the invention, illustrated
in FIG. 3 is generally similar to the embodiment shown
some preferred embodiments of my invention, and in
which:
in FIGS. 1 and 2, and includes parts 1—-18 in sub
FIG. 1 shows a partly sectional side view of an illus
stantially the same form as in the device shown in FIG. 1.
trative embodiment of my invention, the sectionally rep 65 However, the ascending part 2 of pipe 1, is provided with
resented parts being shown in central vertical cross—
a second valve which is generally denoted 19 and has
section;
a threaded valve stem and a button-like valve handle.
FIG. 2 is a sectional view along line 2—2 of the de
vice shown in FIG. 1;
FIG. 3 illustrates a modi?ed embodiment of my inven
tion, in a view similar to that in FIG. 1;
FIG. 4 illustrates-in a view similar to that of FIG.
Furthermore, the upper end of pipe portion 2 is open
and adapted to be closed by a closure member 9” car»
ried by a pivotally movable lever 8" pivoted in a second
protuberance 10” on the outer surface of the part 2 ad
jacent the upper open end thereof.
3,039,500
‘
a
a
Operation of the device shown in FIG. 3 is substan
tially similar to the operation described above of the
ate of said bent portion and said opening, a regulating
valve positioned in said housing, said valve having a
device shown in FIG. 1. However, second valve 19 can
stern extending outwardly of said housing, a handle on
said stem in alinement with said opening and said valve
be also used for control of the discharge of liquid from
the pipette.’ Furthermore, by removing closure member
being adapted to regulate the communication between
9” from the position shown in FIG. 3, the upper end of
tube part 2 can be opened in order to quickly discharge
the interior of said bulb and the pipette in order to
liquid from the pipette.
In the embodiment shown in FIG. 4, the rubber ball
5', and the bent tube 1’ form a single unitary piece made 10
of rubber or equivalent plastic material.
bring about regulated sucking in and discharge, respec
tively, of liquid to be dispensed.
2. A liquid ?lling and dispensing device comprising a
generally inverted \U-shaped pipe, said pipe having a
longer leg and a shorter leg that are joined by and are
In a manner
similar to that shown in FIGS. 1 and 3, an opening 7'
and a pivotally movable closure member 9’ for said open
ing are provided in tube 1'. Instead of the valve shown
in FIG. 1, in the upper part of the ascending portion
of tube 1’, a valve structure of different design is pro—
integral with a bent portion that is positioned inter
vided in FIG. 4. In this valve structure a threaded stem
leg, said longer leg having a lateral opening adjacent the
mediate of one of the ends of said shorter and said
longer legs, a pipette adapted to be a?iXed to the other
end of said shorter leg, a resiliently compressible bulb
connected with the pipe at the other end of said longer
12' can be advanced and retracted by turning valve
other end of the longer leg to which said bulb is con
handle 14f. Upon advancing said valve stem 12', its end
is pressed against the wall of elastic tube 1', which there
nected, said opening connecting the channel of said longer
leg with the open air, a protuberance on the outer sur
by moves to the interior of channel 6 until it contacts
face of said longer leg in diametrically opposed rela
the opposite Wall surface and thus shuts off communica
tion between the upper and lower part of tube 1'. This
pivotally mounted in said protuberance, a ball-shaped
tion to the opening in said longer leg, a movable arm
closure member mounted on said arm in a position for
device is operated substantially in the same manner as the
25 coaction with said opening, said opening, closure mem
device of FIG. 1.
ber, and bulb being positioned aside of and near to
The lining 15 shown in FIG. 1 is unnecessary and is
said pipette, a laterally extending housing on said longer
omitted in FIG. 4.
v
leg intermediate of said bent portion and said opening, a
I desire it understood that my invention is not con
?ned to the particular embodiments shown and described,
the same being merely illustrative, and that my inven
regulating valve positioned in said housing, said valve
having a stem extending outwardly of said housing, a
tion may be carried out in other ways within the scope
handle on said stem in alinement with said opening and
of the appended claims. For example, in the embodiment
illustrated in FIG. 3, either the opening at the upper end
of tube 1 and the accessory parts 8', 9', 10', or the
between the interior of said bulb and the pipette in order
said valve being adapted to regulate the communication
to bring about regulated sucking in and discharge, respec
tively, of liquid to be dispensed, said longer leg of the
pipe having an extension at its end opposite to the end
connected with the bulb, said extension being provided
second valve 19 can be omitted. These and other modi?
cations can be made without departing from the scope of
the invention as de?ned in my claims.
with a closure member adapted to close and open said
What is claimed is:
extension, and to cause quick discharge of liquid from
the device in open position of said member.
3. A liquid ?lling and dispensing device as claimed in
claim 2, in which the longer leg of the pipe is provided
1. A liquid ?lling and dispensing device comprising a
generally inverted U-shaped pipe, said pipe having a
longer leg and a shorter leg that are joined by and are
integral with a bent portion that is positioned intermedi
with an additional valve positioned between said exten
ate of one of the ends of said shorter and said longer
legs, a pipette adapted to be a?ixed to the other end of
said shorter leg, a resiliently compressible bulb .con
nected with the pipe at the other end of said longer leg,
sion and the regulating valve, said additional valve being
adapted to regulate entrance of air to the channel of the
pipe.
leg with the open air, a protuberance on the outer
4. A liquid ?lling and dispensing device as claimed in
claim 1, in which the pipe as well as the bulb consists of
a rubber-like plastic material and forms a unitary struc
ture and the valve is adapted to completely constrict the
surface of said longer leg in diametrically opposed rela
piplei by causing the valve stem to press against the pipe
tion to the opening in said longer leg, a movable arm
wa
said longer leg having a lateral opening adjacent the
other end of the longer leg to which said bulb is con
nected, said opening connecting the channel of said longer
pivotally mounted. in said protuberance, a ball-shaped
closure member mounted on said arm in a position for
coaction with said opening, said opening, closure member,
and bulb being positioned aside of and near to said pipette,
a laterally extending housing on said longer leg intermedi
55
.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,679,104
2,540,360
Trautman ____________ __ July 31, 1928
Ulvild _______________ __ Feb. 6, 1951
Документ
Категория
Без категории
Просмотров
0
Размер файла
377 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа