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Патент USA US2134378

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@ch 25,
s. R ROSENTHAL
mi .MT 3
BACTERIA CONVEYING MECHANISM
Filed NOV. 16, 1956
/
Patented Oct. 25, 1938
2,134,378
UNITED ‘STATES PATENT OFFICE
2,134,378
BACTERIA CONVEYING MECHANISM
Sol R. Rosenthal, Chicago, Ill.
Application November 16, 1936, Serial No. 111,037
'7 Claims. (Cl. 219-19)
This invention relates to mechanism for con
veying bacteria and more particularly to appa
ratus embodying in a unit a device for sterilizing
bacteria transfer instrument and a bacteria
,- container.
In a bacteriological laboratory it is necessary,
in transferring bacteria from one container to
another for propagation purposes and for mak
ing cultures, that the bacteria-carrying instru
11'9 ment and the mouth of the container to which
thebacteria is to be removed be sterilized im
mediately prior to the transfer.
Obviously, the
inside of the container can be sterilized prior to
the insertion of the bacteria, but it is particularly
important that the mouth of the container and the
instrument ‘be ‘sterilized immediately before .the
bacteria are removed. While ‘the invention here
inafter described .is disclosed in connection with
a sterilizer for the mouth and upper portions of
20 test tubes, it is to be understood that the inven
tion is not so limited but may be employed in con
nection with sterilizers for bacteriacontainers .of
various sizes and shapes.
I
A feature of the invention is that the steriliz
14 (l
ing devices are electrically heated, .thereby elimi
nating the possibility of soiling the parts to be
sterilized. In the devices known to the art cm
bodying gas burners it frequently occurred that
soot was deposited on the container mouth.
Likewise the improved electrically heated burner
will not cause air drafts bringing impurities into
contact with thesurfaces to be sterilized.
In apparatus of the art employing gas burners
it was frequently impossible to sterilize both the
£1 bacteria transfer needle and the mouth of the
container immediately prior to their use. An ob
ject of this invention is to devise a unitary device
whereby one operator can simultaneously sterilize
a bacteria transfer needle and the mouth of the
a; container immediately prior to their use.
A further-object of the invention is to devise a
bacteria transfer needle which may be conven
iently handled and readily sterilized.
A further object of the invention is to devise a
unitary sterilizing structure which is simple in
construction and adapted to convenient opera
tion.
The invention will be readily understood from
the following description in conjunction with the
5,’, accompanying drawing, wherein a preferred em
" bodiment of the invention is-shown, in which:
Fig. l is a broken front elevation, partly in
section, of the invention; and
‘
i
Fig. 2 is a broken side elevation of a device em
bodying the invention.
Referring to the drawing, the reference char~
acter v3 indicates a readily movable base-member
havinglegs 3a, the base-member being of any de
sired dimensions. Thebase-member is preferably
hollow and houses an electric .main 4 which ex- 1;,
tends through one end of the base and is adapted
to be plugged into the wiring system of the
building in which the apparatus is used. EX~
tending upwardly from one end of the base
member is a bracket 5 ?xedly supporting a heat
ing element 6. The heating element extends
downwardly and away from the bracket 5 and
comprises a tube 7 preferably formed of in
(i
sulating material, for example, porcelain, and
has a portion M of constricted cross-section 16
shaped to have a test tube placed thereover.
One lead 8 from theelectrical conduit 4 extends
up the bracket through the tube 1 to an opening
near the lower end of the tube, passes through
said opening, is ‘coiled around the constricted ,,
portion 7a of the tube, as clearly shown in the
drawing, to form a heating coil 9, and then leads
through the upper end of the tube and back along
the bracket-5 into the base.
The other end of the top of the base member 3
is provided with an electrical socket it, adapted
to receive terminals ll and [2 of a bacteria
transfer instrument 5%.
Mounted above said
socket and secured to the base by means of bolts
I 4 is an instrument supporting member l5
equipped with bores l6 and i? permitting termi
nals H and [2 to pass therethrough. Connected
to the terminals l I and i2 is an elongated loop
of high resistance wire, such as Nichrome, con
sisting vof lines vl8 and i9 forming a bend 20
at their uppermostportion. As clearly shown in
Fig. 1, the lower portion of the elongated loop is
enclosed in a handle casing 2! and a casing 22
of reduced cross-section adapted to be inserted
in atest tube. The casings 2| and .22 are prefer 40
ably packed with lava 23 or other suitable in
sulating material, and the resistant leads l8 and
i9 are centrally disposed in spaced relation in
said insulating material. The casings 2| and 22
may be connected in any suitable fashion. For
example, as shown in the drawing, they are screw
threaded into a block 24 of insulating material,
such as Bakelite, provided with bores housing
the leads l8 and i9. It will thus be seen that the
improved bacteria transfer instrument com 50
prises a needle-like device having terminals H
and I2 electrically connected to socket it] when
the instrument is resting on its support [5 and
anexposed bacteria carrying portion 25’adapted
2,134,378
2
to be rapidly brought to a sterilizing temperature
in such position.
The socket I0 is provided with terminals 26
and 21, the terminal 21 being electrically con
cally connecting said resistance element and
said socket; and means for controlling the cur
rent flow from said resistance element to said
socket.
nected to a switch 28 of conventional character
provided with a toggle member 29. It is readily
apparent from Fig. 1 that the resistant coil 9 and
the resistant leads I8 and I9 form a part of the
same circuit, extending through the heating coil
10 9, the switch 28, terminal H, the resistant leads
l8 and I9, terminal [2 and back to the cable 4.
In operation the resistant coil 9 and the bac~
4. In a unitary structure of the type described,
a hollow base member; a bracket mounted at one
end of said base member; a core of non-conduct
ing material secured to said bracket and having
a reduced portion adapted to have a bacteria con
tainer placed thereover, said reduced portion de 10
pending downwardly and away from said bracket,
teria carrying loop 25 are rapidly heated to a
white or sterilizing heat when the instrument I3
15 is inserted in its socket l0 and the switch 28 is
closed. The mouth of a test tube to be employed
as a bacteria container may then be placed over
the heating coil 9 and subjected to the sterilizing
heat emanating from the coil 9.
It is readily
20 apparent that at the same time the loop 25 will
be subjected to a sterilizing heat. Upon break
ing the circuit by opening the switch 28, the loop
25 will rapidly cool and the bacteria transfer in
strument may be removed from the socket and
inserted in a bacteria containing vessel.
The foregoing detailed description has been
given for clearness of understanding only, and
no unnecessary limitations should be understood
therefrom, but the appended claims should be
30 construed as broadly as permissible, in view of the
a resistance element wound around said core; an
electrical socket in said base member; an instru
ment support having bores and disposed above
said socket; a bacteria transfer instrument adapt 15
ed to rest on said support comprising a resistance
wire forming an elongated loop ending in termi
nals adapted to be inserted in said socket, and a
handle enclosing a portion of said elongated
loop; a source of electrical supply in said base;
a circuit electrically connecting said current sup
ply, said resistance element and said socket; and
means on said base for opening and closing said
circuit.
5. In a unitary structure of the type described,
a base, an electrical socket forming a part of said
base, a resistance wire adapted to be heated to a
sterilizing heat in the form of an elongated loop,
an insulated handle enclosing a portion of said
resistant wire, terminals on the ends of said re
prior art.
I claim:
1. A bacteria transfer instrument comprising a
handle portion, a portion of reduced cross section
35 secured to said handle portion and adapted to be
inserted in bacteria containers, said handle por
tion and reduced portion being packed with in
sulating material, .a plurality of conductors ex
tending in spaced relation through said insulat
ing material in said handle and reduced portions
and ending in terminals depending from said
handle portion, and an elongated bacteria trans
fer loop of resistant material forming an exten
sion of said conductors and held in a ?xed and
exposed position above said reduced portion, said
loop being adapted to be heated to a sterilizing
temperature immediately prior to transfer of bac
teria thereon.
2. In a unitary structure of the type described,
50
a base member; a support mounted on one end
of said base member; a core of non-conducting
material depending from said support; a resist
ance element wound around said core; an electri
cal socket mounted in said base; a bacteria trans
vi Ll
fer instrument comprising a handle portion and
a resistance element extending through said han~
dle portion, having an exposed portion above said
handle portion and ending in terminals depend
ing from said handle portion adapted to be in—
sistant wire adapted to be received in said socket,
a bracket mounted on said base, a core of non
conducting material depending downwardly and
away from said bracket, a resistance element
coiled on said core adapted to be heated to a
sterilizing heat, means electrically connecting said
socket and said resistance element whereby said
resistance element and said resistance wire may
be brought to a sterilizing heat substantially si
multaneously, and means for controlling said 40
connecting means.
6. In a unitary structure of the type described,
a base member; a heater ?xedly mounted on one
end of said base comprising a refractory rod, and
a coil of resistance material helically wound 45
thereon; an electric socket mounted in said base;
a bacteria transfer instrument detachably car
ried on said socket, said instrument comprising
an insulated handle portion and a resistance ele
ment extending through said handle portion, hav 50
ing an exposed bacteria transfer portion above
said handle portion and terminating in a plug
depending from said handle portion adapted to
be inserted in said socket; and means Within said
base member and said heater electrically con 55
necting said coil of resistance material and said
socket.
'7. In a unitary structure of the type described,
60 serted in said socket; and means within said base
a base member; a vertical bracket mounted on
said base, an electrical heater carried on the up
per end of said bracket at an angle thereto com
prising a tube of refractory material, coils of re
3. In a unitary structure of the type described,
sistance material helically wound on said tube,
and leads extending from said coils through said
member and said support electrically connecting
said ?rst resistance element and said socket.
a base member; a bracket mounted on one end
of said base member; a tube-like core of insulat
ing material depending downwardly and away
from said bracket; a resistance element wound
around said core; an electrical socket in the other
end of said base member; a bacteria transfer in
strument comprising a resistance wire forming an
elongated loop and ending in terminals adapted
to be inserted in said socket and a handle portion
packed with insulating material enclosing a por
tion of said elongated loop; means in said base
75 member and carried by said bracket for electri
bracket and into the base; a bacteria transfer 65
instrument detachably mounted on said base
member, said instrument comprising an elongated
insulated handle portion and elongated bacteria
transfer member preferably formed of wire and
terminating in a loop; a source of electrical sup
70
ply in said base and forming a circuit with said
leads; and means on said base for opening and
closing said circuit.
SOL R. ROSENTHAL.
75
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