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Патент USA US2119320

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May 31, 1938.
Filed June 23, 1956
Z ?w
Patent?d M?ysl, 1938 I
2,l19,320 _
'uNiTED sTATEs„2,119320PÅTENTŸoF-Fic-E Í
' ›
Emmanuel Dobrowsky, New York, N. Y;
Application June 23, 1986, serial No. 86385,,-Å
1 Claim. (ol. vsie-_min
throughithe _door of the food compartment; and
This invention relates to refrigerators, an ob
Fig. 6 is a sectional elevation on the line 6-6 p
ject of the invention being to provide a -refrigera
tor and more speciflcally the modern 'type of of Fig. 5.
mechanical refrigerator with means for main ` The reference Character A is employed to indi
cate generally a refrigerator which, as above `
5 taining a partial'vacuum in the food compart
pment. This means includes a suction pump or stated, is of the modern mechanical type.` The
other suitable device which operates to draw refrigerator A has a food compartment I and w
air out of the food compartment, and this not a door 2 to close the same. As it is necessary in
only creatés a partia] vacuum in the food com
io partment
but it, also draws off odors frornthe
food compartmentso as to prevent the lcon
tamination of one article of food by odors from
another or other articles of food. The principal
object of the' invention, therefore, is to create or)
15 maintain a partial vacuum in the food compart
ment which 'assists in the preservationi of the`
tight, the door and preferably the wall of the 10
opening in the casing are provided with suitable
packing material 3 to render'the closure airtight
when the door is closed. 'I'he food compartment
| is provided with an air outlet chamber 4, pref
erablý having a screened entrance end 5 and 15
constructed with a port 6 adapted to be closed
by a check valve 1. 'This check Valve is prefer
foods in their proper condition; reduces the tem
perature within the food compartment, and car
ably of rubber or' other suitable material so' as
ries oñf odors from the, food compartment. `
'to insurean lairtight closure. The chamber 4
the food compartment and raise the lpressure
is connected to an outlet pipe 8, which isÅ opera 20
tively connected to a. suction pump 9 and this
suction pump 9 is driven by an electric motor
Ill. It is of course to be understood that the motor
and pump may be located wherever found most
therein to atmospheric pressure;v but when the
A further objectis to provide means of this
20'character which are automatic in.their opera
tion so that when the door of the refrigerator is
opened it will, of course, permit air to rush into
'my invention to have the food compartment air
door i`s again closed a partial vacuum creating `
means lwill be automatically started and .auto
In the food compartment i a ?xed electric p
contact il is provided which is adapted to be en
matically stopped when the pressure is loweredlu gaged by a movabie contact arm |2. This arm |2
to the desired extent.
With these and other objects in view, the in
vention consists in certain novel features of
construction and combinations and arrange
is illustrated as pivoted between its ends on a pin? i
|3 mounted in a bracket M and operatively con 30
nected at its end to a diaphragm IE which is
~secured over a screened opening IG in the wall of `
the casing. A spring contact brush |`l exerts
pressure on one end of the arm tending to 'move
it toward the fixed contact II, and a stop |8 is
provided in the casing to be engaged by the arm
In the accompanying drawing
i2 to limit its movement away from the fixed con
Figure 1 is a perspective view of my improved
tact li. In 'the food compartment i a spring
refrigerator showing the door to the food com
pressed'plunger switch l9 is located and is mov
partment in open position;
able in a casing 20 and adapted when in its in
section through the refrigerator and showing Ward position to close the circuit between two
one means for operatively connecting the food contacts 2| and 22. The outer end of this plunger
compartment of the refrigerator with a suction switch |9 is in the path of movement of the
door 2 so that when the door is opened the spring
pump, and this view, which is partly diagram
` ments of parts, all of -which will be more fully
hereinafter described and pointed out in the
45 matic, shows the position of the parts when the
i desired pressure has been lowered su?iciently in
the refrigerator and the pump is not Operating;
Fig. 3 is a`` fragmentary view similar to the
fragmentary sectional portion of Fig. 2, showing
50 the position of the parts when the pump is'op
Fig. 4 is a fragmentary view in horizontal sec
tion through a portion of the' door and casing,
this view being taken on the line 4-4 of Fig. 5;
55 -Fig. 5 is a fragmentary'view in Vertical section
pressed plunger switch will be moved 'forwardly 45
' to open the switch, and when the door is closed
- it will force the plunger switch inwardly to cause
the same to engage the contacts 2| and 22 and ?'
close the circuit. I have illustrated diagram
maticaily in Fig. 2 an electric circuit which might
be employed in connection with my improved ap
paratus. In this circuit 23 and 24 indicate lead-in
wires from the ordinary city service. The wire 2!
is connected to a pole 25 of the motor Ill and a
wire 26 connects the other pole 21 of the motor 55
with the ?xed contact I|_. The contact brush l'l
tion by means of a pin or rivet 31.
is connected by a wire 23 with the contact 2| and
the other contact 22 is connected to the lead Wire
portion of this valve is preferably thicker than
the rest of the valve and the thinner edge por
tion of the valve normally covers the air duct 36.
The operation of the mechanism above de
scribed is as follows: When the door 2 is opened
The central
The crank arm 33 may engage 'the central por
tion' of the valve and operate to assist in closing
the air from outside will of course rush into the
the same and holding the same in closed position.
food compartment and equalize the pressure
within and without the same. When the door is
open, therefore, it is desired that there will be
no operation of the pump and this is prevented
by reason of the factthat the piunger switch will
spring outwardly and maintain open circuit as
long as the 'door is open. Further, when the
pressure in the compartment is raised the dia
phragm |5 will return to a straight or normal
position, as shown in Fig. 3, which movement
causes the contact arm 2| to en'gage the ?xed
contact H. The circuit will not be closed until
the door is closed as above explained. As soon
as the door is closed and the circuit .to the motor
Ill is closed, this motor will operate the pump 9
to draw air out of the refrigerator past the check
valve 1, and when the pressure in the refriger
ator is su?lciently lowered or, in other words,
when the desired partial vacuum is reached, the
A chain or other ?exible connecting device 38
connects the lower edge portion of the valve 35
with the arm 33 so that when the handle 32 is 10
moved outwardly and upwardly .to move the latch
bar for engagement with the keeper 3|, the arm
33 operates to draw the ?exible edge portion of
valve 35 from over the air duct 36.
Thus a cer
tain amount of air will rush into the opening 34,
facilitating the release of the valve 35 and the
continued movement of the handle 32 will draw
the valve 35 away from the opening 34 allowing
additional air to rush into the food compartment
to raise the pressure therein and to make it easy 20
to open the door. When the door is closed the
valve 35 will of course close the opening 34 and
the duct 36 so that vthe pressure within the food
compartment can be reduced as desired.
While I have illustrated and described what I
believe to be the preferred embodiment of my
diapnragm Is W111 be drawn mwardiy to the ' invention, it is obvious that various slight changes
position shown in Fig. 2 of the drawing, which may be made with regard to the form and ar
will result in causing the contact arm |2 to move rangement of parts without departing from my
30 away from .the contact || and open the circuit,
thus stopping the motor until for some reason
or other the pressure within` the refrigerator
should again rise.
As it is well known-that it would be di?icult to
invention, and hence I do not limit myself to the 30
precise details set forth but consider myself at
'liberty to make such changes and alterations as
fairly fall within vthe spirit and scope of the
I claim:
35 open the door of the refrigerator when a partial
vacuum is in the food compartment, it is neces
The'combination with a refrigerator having a
sary or 4at least desirable to provide a means food compartment and a door thereto, a pump
which will permit air to enter the compartment operatively connected to the compartment and
when the latching means of the door'is operated. adapted to maintain a partial vacuum thcrein,
This means is shown in detail in Figs. 5 and 6 `said door having an air inlet opening, a valve
of the drawing. I have illustrated a latch box normally closing said opening, a latch on the
29. secured to the outer face of the door and in door operatively connected to vthe `Yvalve and
which a-latch bar 30 is mounted to, turn and is adapted to open the valve 'when the latch is'
adapted to engage a suitable keeper 3| on the moved to open position, said valve having a flexi
An Operating crank handle 32 is ?xed to
the latch bar 30 and carries within the box 29 a
crank arm 33. The door 2 of the food compart
ment is provided with an opening 34 communi
cating with the interior of the latch box 29 and
a valve 35 normally closes this opening. A small
air duct 36 is provided in the door communi
cating with an opening 34 in the latch box. The
' valve 35 is preferably of the flexible disk type,
as shown, secured to the door at its upper por
ble edge portion, said door` having an air entrancc
ductvcommunicating with the air inlet opening
in the door normally closed by the edge portion of
the valve, and 'a flexible device connecting the
latch with the edge portion of the valve whereby
the edge portion of the valve will be ?rst lifted
to open the duct when the Iatcnmechanism is
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