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Патент USA US2110748

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2,110,748,
Patented Mar. 8, 1938 _
UNITED STATES PATENT oFFlcE
2,115,748
COOKING DEVICE
Ralph L. Tweedale, Waterbury, Conn.
4
Application February 26, 1931, Serial No. 518,545
Renewed March 1l, 1937
6 Claims. (Cl. 21B-19)
This invention relates to cooking devices more
particularly to the type in which means is pro
vided to prevent over cooking.
Objects of the invention are: To provide an
improved cooking device having means incor
porated therein for sensing the occurrence of
such conditions as indicate that cooking should
be terminated;
4
To provide a cooking device having a trans
10 lating device therein operable in response chang
ing conditions within the food being cooked;
To provide a cooking device having means re
sponsive to change in the amount of reiiected
light from the food for controlling a translating
the U-shaped extension |22 of latch bar |22 and
its other end abutting against an adjusting screw
|34 mounted in the side of the housing |54. The
opposite end of the latch bar |22 carries an ar
mature IIB in operative relation to the electro- ,
magnet |24. A stop |34 pressed out of the hous- "
ing |44 limits the spring lurged movement of
latch bar |22 to Just the amount necessary to
completely free the ar'm ill. Mounted on an
insulating block |45 is a pair of contacts |42 m
adapted to be closed when armature |35 is re
tracted and to be opened when armature |35 is
attracted.. The contacts |42 are connected to a
15 device;
_
To provide a generally improved cooking
de
vice ior terminating the cooking period, or sig
nalling that the cooking period should be ter
mìnated, dependent on the condition of the food
o itself rather than on an arbitrarily set time
.measuring device or an energy measuring device.
A specific embodiment oi the invention is il
lustrated in the accompanying drawing, in
so
a glass window |45. An opaque screen |48 has 15
a window |55 therein so arranged that it allows
light reflected from the bread 'tó_ tall on the
light window .oi a photo-electric' cell |52.
The photo-electric cell |52 may be connected
in circuit in various ways well known in the art.
Preferably it is connected to a power pack con- 20
tained in the casing: |54. This power pack may
be similar to those used in radio receiving sets
oi the so called all-electric type and supplies a
_high potential direct current to the cell |52. A
>casing |55 contains a relay oi’ the electronic
type for amplifying the current passing the cell
ent invention on line |--| of Figure 2.
_
|52, the output of the relay goes directly to the
Figure 2 is a vertical cross section on line magnet |24. It is obvious that the cell |52 may
2-2 of Figure i, and
v
'
connected in circuit in other ways depending 30
Figureaisacrosssectiononlinel-Iof be
c-n the sensitivity o! the cell used, the type oi
Figure 1.
}
current supply with which the toaster is designed
which:
_25
signal light |44 mounted in the base |52 behind
'
Figure 1 is a horizontal 'cross section of a
toaster embodying a preferred form of the pres
„ In the embodiment of the invention shown in
the drawing there is disclosed an electric
toaster in which the determination of the end
35 of the toasting period depends on the color of the
toast. A base |02 supports a housing |54 in
which are mounted a pair of conventional elec
tric heating elements IUS. Pivoted at |42 is an
arm lili having a linger piece I|2 at its opposite
end. Between the heating elements |56 and at
either side of the arm ||5 are two rows of ver
tical rods ||4 which form a grill to keep -the
bread properly spaced from the heating elements.
Blidably mounted on the four outermost rods is
Y 45 a toast carrier H5.
A link ||2 pivòted to the
to be used, etc. For example, ii a very sensitive
cell is used the relay |55 may be omitted and if
the toaster is designed for operation from, a suit-- 3,
able source of direct current the power pack |54
may also be omitted in which case the cell |52
and _magnet |24 may be connected in series with
the source o! current for the heating elements
|55.
Inoperationasiiceoibreadisplacedinthe
holder ||5 and the arm ||l is’depressed. The
light of the heating element |55 is reilected from
the slice of bread to a fairly high degree be
caime the bread is white, or if brown bread is 45
used it is lighter in color than when fully toasted.
This
a relatively high energization of
the magnet |24. While the arm ill is still held
manually the screw |34 is adjusted to
toast carrier ||5 and to the arm ill enables the
two to move up and down together. A spring
|20 urges the arm ill and toast carrier to their
uppermost position. A latch bar |22 of non - the point where the spring |25 just overcomes 50
so magnetic material slides through the hollow core' the attractive force oi magnet |24. The screw
of an electro-magnet |24 mounted on the base is then backed ci! a small amount depending on
|52 by a U-shaped bracket |26. The latch bar the color oi the finished toast which is desired.
|22 has a nose |28 adapted to engage over the The magnet then attracts armature l“ moving
top of the arm III to hold it in depressed posi
latchbar |22 into latching position. The arm 55
‘a5 tion.s A sprlng‘w _haspne end abutting mi
2,110,748
2
the toast browns to a point where the light re
ilected therefrom is so far reduced that the mag
net IN is no longer able to hold armature |36
tion an electric heater, means for holding bread
in a stationary position adjacent the heater to
be'toasted, a light-sensitive cell, a screen adapted
to shield the cell from light rays emanating from
the heater directly but to pass light rays reilected
against the force of spring |39.
from the bread, and means controlled by the cell
curs latch in i's released and arm
for signalling the end o! toasting.
H0 will now remain in depressed position until
together with the carrier lli
toast by the spring |20. Signal i“ is also light
ed by closure of contacts M2. It will be seen
`
3. In a domestic toasting device for table use
for toasting at one operation a quantity of food
having the characteristic that in its completely 10
that magnet |24 is able to hold the arm lill toasted state it has developed a permanent al
10 down only as long as a certain amount oi light
teration in the surface color of the food which
is reilected from the toast depending on the set
bears a definite relation in amount to the amount
ting oi' screw |34. Thus the toast is always o! toasting regardless of variations in toasting
thrown up when it reaches the desired color re
conditions, the combination of a frame, a heat 15
gardless of the relative freshness of the bread ing element disposed in the frame, means for
or the temperature oi the heating elements.
holding a .quantity oi food in a position to be
The invention may be also embodied in a toasted by the heating element, and means for
signalling the end of the toasting operation in
toaster in such a manner as to depend on re
iiected light from both sides of the toast. Thus ‘ cluding a device which is responsive solely to said
the cell |52 may be so podtioned as to receive
20 light equally from both sides of the toast through . color alteration oi the lood as it is being toasted
and which is affected solely by said color altera
separate windows such as lill and provided with tion and a signal mechanism controlled by said
suitable reflectors to converge the light rays on device.
`
the single cell. Alternatively two cells may be
4. In a domestic toasting device for table use
one on each side oi the bread, the cells for toasting at one operation a quantity of food
25 used,
being connected in series or parallel to the relay having the characteristic that in its completely
|56 i! such be used, or being connected to sep
toasted state it has developed a permanent al
arate relays arranged to control the heating
elements IIB separately. The latter arrange
ment presents the advantage that a slice of bread
teration in the surface color of the food which
bears a definite relation in amount to the amount
of toasting regardless of variations in toasting
which is drier Áon one side than the other may conditions the combination oi a frame, a heating
be toasted to the same color on both sides.
element disposed in the‘frame. means for holding
It will be seen that a cooking device has been a quantity of food in a position to be toasted by
provided wherein the time at which cooking is to the heating element, and means for terminating
the toasting operation including a device which
cease is determined by the occurrence of a cer
35 tain predetermined condition of the lood itself. is responsive solely to said color alteration of the
Various modiilcations will suggest themselves to food as it is being toasted and which is ailected
those skilled in the art and it is to be understood solely by said color alteration. and mechanism for
that the scope of the invention is limited by the interrupting the toasting operation controlled
scope of the appended claims, rather than by
second device.
4.0 the specific embodiments illustrated and described by5.said
In a bread toaster provided with a heating
as examples of devices embodying the invention. element, a light sensitive element responsive to
the surface color of the bread being toasted. and
I claim:
»
1. An electric toaster comprising in combina
means operated thereby for terminating the
tion an electric heater, means for holding bread toasting of the bread slice when a predetermined
45 in a stationary position adjacent the heater to
surface color has been attained.
6. In a bread toaster provided with a heating
be toasted, a light-sensitive cell, a screen adapted
to shield the cell from light rays emanating from element, a light sensitive element responsive to
the heater directly but to pass light rays reflected the surface color of the bread being toasted, and
from the bread, and means controlled by the cell signaling means operated'thereby when a pre
50 for moving the bread to a position remote from 'determined surface color has been attained.
RALPH L. TWEEDAIE.
the heater.
2. An electric toaster comprising in combina
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