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Dec. 31, 1946.
,E_ ‘L WIEGAND
2,413,536
ELECTRIC HEATER
Original Filed Aug. 23, 1941
2 Sheets-Sheet 1
~ . [aw/N L. VV/EGHND
INVVENTOR
BY
MWi/m
AT TORNEYS
Dec. 31,1946. '
E. L. WIEGAND
'
2,413,536
ELECTRIC HEATER
' Original Filed Aug. 23, 1941
2 Sheets-Sheet 2
F/G. 7
56.4
45, a 4?
16
J
‘’ [aw/N A. mesa/v0
INVELJJ' R
BTM WW
. ATTORNE‘fé
2,413,536
Patented Dec. 31, 1946
UNITED STATES PATENT OFFICE
2,413,536
ELECT-RIC HEATER
Edwin L. Wiegand, Pittsburgh, Pa., assignor to
Edwin L. Wiegand Company, Pittsburgh, Pa'.,
a corporation of Pennsylvania
Original application August 23, 1941, Serial No.
408,073. Divided and this application Decem
ber 9, 1942, Serial No. 468,382
6 Claims. (Cl. 219—37)
1
My invention relates to electric heaters, more
particularly to electric range units, and the prin
2
source of, say 220 volts, in such manner that
either one or both may be energized, the elements
cipal object of my invention is to provide new and
improved electric heaters of these types.
This application is a division of my copending
herein shown are designed to provide 2000 watts
when both are simultaneously energized. The
element H is so designed that when it only is
application Serial Number 408,073, ?led August
23, 1941.
wattage will be spread out over a considerable
energized, it will provide 1400 watts, and this
area, but with some concentration at the center.
In the drawings accompanying this speci?ca
The element 10 is so designed that when it only
tion, and forming a part of this application, I
is energized, it will provide 600 watts. 0f course,
10
have shown, for purposes of illustration, one form
the wattages will be in relation tc_the voltage
which my invention may assume, and in these
used, and in the embodiment it is possible to have
drawings:
other heats. For instance, if 110 volts were used,
igure 1 is a plan view of an electric range
the elements H) and H herein disclosed are so
unit illustrating an embodiment of the invention,
designed that when both are energized they will
Figure 2 is a bottom plan view of the embodi
provide 500 watts; when the element H only is
ment, drawn to a smaller scale,
energized, it will provide 350 watts; and when
Figure 3 is a side elevation of the embodiment,
the element It’! only is energized, it will provide
Figure 4 is a bottom plan view, the reflector be
150 watts. Also, it will be apparent that it is
ing omitted to better illustrate certain of the
20 possible to employ a switch connected to different
parts,
voltages, as for example 220 volts and 110 volts,
Figure 5 is a sectional view corresponding gen
and so designed that the elements may be singly
erally to the line 5-5 of Figure 4,
or
together energized with either voltage.
Figure 6 is a fragmentary sectional view corre
The element I0 has end portion m, 722. and
sponding generally to the line 6-0 of Figure 5,
25 the element II has end portions 113. 104. Each of
and
the end portions terminates in a connection ter
Figure '7 is an enlarged sectional View corre
sponding generally to the line '|-'| of Figure 5.
minal, respectively numbered Hi. 15. i5. and H,
H. As herein shown, each element comprises
which may be housed in a suitable insulating
block or housing !8. The terminals !5 and iii are
here shown bridged by a bridge plate l9, and the
connection terminals may be connected to a
a tubular metal sheath within which is disposed
electrical resistance heating means 12. embedded
means of a proper electrical switch (also not
in refractory electrical-insulating heat-conduct
shown).
The electric heater or range unit embodying
my invention may comprise one or more heating
elements, in this instance two elements In and
ing material i3. The insulating material 13 may
be in the form of suitable granular, comminuted,
or powdered refractory material, preferably com
pacted to a dense hard condition.
Each of the elements I!) and H has an active
portion which is preferably triangular in cross
section, as best shown in Figure 5, and the active
portion of each element is of generally spiral
form. Referring particularly to Figures 1 and 4,
it will be noted that the element l I has a central
portion wound about itself for one turn, and the
remainder of the active portion of the element
H is then intercalated with the element I0.
Therefore, the element II has portions disposed
side-by-side and then has portions disposed
side-by-side with portions of the element l0.
vThis particular construction makes possible a
distribution of heat not attainable with struc
tures of the prior art.
For example, assuming that the elements l8
and II are electrically connected to an electrical
source of electricity (not shown) through the
The end portions 121, m. m, m are all of sub
stantially circular or rounded section, to facili
tate bending. and preferably only the spiral por
tions of the elements are of triangular section.
The elements such as may be embodied in the
range unit herein shown may initially comprise
a tubular sheath of substantially circular cross
section into which the resistor and insulating
material have been introduced endwise. and may
have their active portions side-pressed in suit
able dies to a desired triangular cross-section,
and the element may be press-forged as set
forth in my conending application Serial Number
361997, filed October 21, 1940. Accordingly, the
active portion of each heating element H0 or H
comprises a tubular sheath having two walls 20,
‘2 I, the major portions of which are flat and make
between them an angle of approximately 60°, these
walls merging in a rounded apex 22. The upper
wall 23 is substantially entirely ?at and makes
with the walls 20, 2| angles of 60° respectively.
2,413,536
3
4
In the embodiment shown, the ?at portions of the
walls 2!}, 2! are respectively of less cross-sectional
extent than the substantially entirely ?at upper
wall 23.
As best seen in Figure 5, the upper walls 23
lie in a common plane. Therefore, if an object,
such as a cooking vessel, is placed upon the heat
clip having a tongue 39 extending downwardly
generally along a surface of the arm 21, ex
tending through a respective slot 31 and having
its, extremity bent upwardly, as best seen in
Figure 7. Thus, the elements H], II are held
against substantial movement toward or away
from the supporting means 25.
ing means comprising the heating elements M, l l,
Desirably, the
slots are elongated in a radial direction, and
in this direction are longer than the width of the
walls 23, and therefore is in excellent heat-con 10 clips 38 to allow for relative movement of the ele
ducting relation with respect to a relatively large
ments in a plane de?ned by the upper margins
area of the heating means, so as to-be heated
of the arms 21 through 32, so as to accommodate
the vessel will be in contact with the ?at upper ’
mainly by conduction. The generally down
for expansion and contraction of the heating ele
wardly facing lower walls 26, 2| of each heating
ments. In this manner, binding, straining, or
element radiate some heat diagonally downward 15 warping of the parts is prevented.
ly in respectively opposite directions, considering
any given portion of an element, and this heat
is re?ected upwardly by a re?ector 24 which gen—‘
erally underlies the heating elements I9, ll.
The extremity of the arm 28 is formed with a
projection til ?tting into an aperture 4| in a
bracket 452.
The bracket 42 is longitudinally
curved, as best seen in Figure 4, and at its lower
The end portions 101, a, pg, 104 extend down
wardly from their respective active portions, and
then have their respective extremities bent
slightly upwardly toward the insulating block [8,
thus forming a drip point 25, best shown in Fig
20 extremities is provided with ?ngers 43 extend
ing inwardly of the range unit, and terminat
ing in upwardly directed ledges 44. An upper
side margin of the bracket 42 has an angular
extension 45 upon which the apex of the ele
ure 5 with reference to the portion 193. Prefer 25 ment It, adjacent the end portion 122, rests, thus
ably all the end portions are brought together at
supporting this part of the element ll), since it
an edge of the range unit, as herein shown, so
that external electrical connection thereto is
facilitated.
.
is spaced a substantial distance from the arm
32.
The lower margin of the bracket 42 is
formed with a curved recess 46 (see Figure 6) to
Tracing the various portions of the elements, 30 pass the adjacent parts of the end portions 101, 102,
and starting with the portion 173 of the element
an, 114, and the adjacent parts of the end por-.
II,’ it will be seen that the portion 203 extends
tions p1, 1174 bear against the de?ning margin
toward the center of the range unit, upwardly
of therecess 46 for the purpose of steadying
to the active portion, and the active portion is
and aiding in the support of the heating ele
wound about itself at the center at least once, as 35 ments H), i l. A ground screw 41 is threaded into
shown at 115, and then has an intermediate por
a tapped aperture formed in the bracket 42, and
tion 736 spiralling to the end portion 124. The
is adapted to receive a conductorwhich may
element ill starts with the end portion 101 extend
be grounded to a suitable ground, such as a
ing upwardly to its active portion, and this active
stove frame or the like.
portion is intercalated with respect to the active
Circumscribing
the
outer
ends
of
the
arms
of
portion of the element ll, except at the central
the supporting means 26 is a ring 58, having a
portion 105, and terminates in the end portion 122. _
cylindrical
portion £59 merging with an annular
The apexes 22 of the heating elements Id and
portion 50 in turn merging with a downwardly
II de?ne the under side of the active portion of
the heating means, and this under side is mount 45 extending cylindricalr?ange 5|, adapted to en
gage a range top (not shown). The arms 21,35,
ed upon'a supporting means 26, which may be a
and 32 are longer than the other arms, and the
grating or grid comprising a plurality of general
longer arms are provided with projections '52
ly radially disposed arms 21 to 32 inclusive. ‘In.
forming shoulders withthe respective arm, the
the embodiment shown, the supporting means 26
comprises a straight sheet-metal member, pro
viding the arms 21, 28. The arms 29, 30 are
formed by a sheet-metal member bent so as to
form a'central generally U-shaped bight 33, and
the arms 29, 30 extend from this bight in gen
erally V-shaped relation with respect to each
other. Likewise, the arms 3!, 32 are formed
by a sheet-metal member bent so as to form a
central generally U-shaped bight 34, and the
projections being adapted to engage respectively
in apertures 53 formed in the cylindrical portion
49,- and the shoulders being adapted to bear
against the adjacent inner peripheral surface of
the cylindrical portion, so that the ring'48 is
adapted to support the supporting means 26.
The arm 2?, adjacent its extremity, is provided
with a downwardly extending hook 54. As here
shown, the hookis a separate piece and is spot
welded to the arm 21. The hook 54 has anin
arms 3!, 32 extend from this bight in generally
V-shaped relation with respect to each other. 60 clined surface 55 terminating in a hook~tip 56.
The re?ector 24 is disposed below the support
The bights 33, 3d are fastened to opposite sides
ing means 26, and as best shown in Figure 5, is
of the sheet-metal member forming the arms
of generally conical form, or to describe it dif
21, 28, as by means of rivets 35. If desired, all,
ferently, is generally dish-shaped, with the open
or‘certain of the arms may be provided with stif
ing of the dish directed toward the supporting ~
fening ribs, as indicated by the numeral 36.
. Means may be provided to hold the heating
65 means 25.
The peripheral margin of the re
?ector 24 is formed with a downwardly oii‘set
means comprising the elements H], H in desired.
curved portion 51, and the re?ector, in line with
assembly-with the supporting means 26. In the
the hook 541, is formed with a slot 58 of'a length
embodiment shown, this means comprises a plu
rality of slots 3? formed in the arm 27, each 70 to pass the hook 54. The re?ector 24 has a pocket
59 of generally U-shaped cross-section, as best
slot generally underlying the section of the re
seen in Figure 6, the bottom wall of the pocket
spective heating elements traversed by the arm
extending radially inwardly, and merging with
27, as best seen in Figure 5. A plurality of clips
the
reflector wall adjacent a central opening 60
38 are secured to the apex of each element in,
H- adjacent the arm 21, as by spot welding, each 75 formed in the re?ector 24. On either side of the
pocket 59, the re?ector wall isformed with up
2,413,536
5
adjacent said curved marginal surface for pass
ing said hook portion and a pair of upwardly
pressed areas spaced to correspond to the spacing
of said ledge means, the construction being such
wardly pressed areas 6|, positioned so that the
recess surfaces thus formed are adapted to re
ceive respective ledges M. The hook 54 and the
ledges M provide hanger means from which the
re?ector is adapted to be hung.
The re?ector 2a is adapted for assembly and
disassembly with respect to the supporting means
that the recess surface formed by the upwardly
pressed areas receives and rests on said ledge
means and said hook portion extends through
said reflector means aperture and engages the
by movement generally edgewise of the support
adjacent under surface of said curved marginal
ing means. For example, to assemble the re
surface and holds said re?ector means in assem
?ector 2:3 with the supporting means 25, the re 10 bled position with said supporting means.
?ector 2a is moved in a direction generally paral~
2. An electric heater, comprising: electrical
lel to the bottom edges of the arms 2'! to 32 so
heating means; supporting means, supporting
that the pocket 59 moves to cover the adja
said heating means; connection means, con
cent parts of the end portions 111, 392, p3, and 2a..
structed and arranged to connect said heating
and the reflector is moved a distance suf?cient
means and said supporting means, and to hold
to align the slot 58 with the hook 5d, at which
them against substantial lateral movement; re
time the re?ector is lifted slightly to pass the
?ector means, generally underlying said heating
hook through the slot, and the re?ector 24 is
means; and holding means, normally holding said
again moved slightly in the ?rst direction until
re?ector means assembled with said supporting
the recess surfaces formed by the upwardly
means, comprising substantially stationary por
pressed areas 5! align with respective ledges it.
tions normally underlying portions of said re
At this time, the re?ector is permitted to hang,
?ector means supporting said re?ector means on
with the recess surfaces of the upwardly pressed
said holding means, and said holding means and
areas resting on the ledges 44, and the re?ector
said re?ector means being constructed and ar
surface adjacent the slot 58 resting on the hook
ranged to permit relative lateral movement of
surface 55. The hook-tip t3 bears against the
said re?ector means to bring respective portions
offset margin 51 of the re?ector, and the hook
out of opposition and thus permit said re?ector
surface 55 is inclined, so that either or both
means to be moved substantially perpendicularly
prevent unintentional reverse disassembly move
away and thereby disassembled from said sup
ment of the re?ector. To disassemble the re
porting
means.
?ector 24 from the supporting means 26, a re
3. An electric heater, comprising: electrical
versal of the assembly movement is necessary.
heating means; supporting means, supporting
As best seen in Figure 5, the peripheral mar
said heating means; connection means, con
gin of the re?ector 2% is spaced from the cylin
structed and arranged to connect said heating
drical wall 49 of the rim 48, to provide a sub
means and said supporting means, and to hold
stantially annular air opening 62 (except at the
them against substantial lateral movement; re
pocket 55!) so that air may enter this space ra
?ector means, generally underlying said heating
means; and holding means, normally holding said
dially inwardly and proceed upwardly through
the grating and heating element assembly. The
re?ector means assembled with said supporting
means, comprising substantially stationary por
downwardly inclined wall of the re?ector 24
provides a drainage surface for any substances
spilled on the re?ector, and these substances may
tions normally underlying portions of said re?ec
tor means supporting said re?ector means on said
drain through the central opening M, which
opening also provides an additional air open
ing.
holding means, and said holding means and said
45 re?ector means being constructed and arranged
A central medallion 63, or the like, may be
provided to cover a desired amount of the space
at the center of the heating means. As here
shown, the medallion t3 rests on the upper edges
of the arms 21 through
adjacent the bight
portions
355i, and has marginal extensions,
forming four legs 64, which are secured to the
side surfaces of the bight portions 33, 34 in any
suitable means, as for instance by spot welding.
From the foregoing it will be apparent to those
skilled in the art that I have accomplished at
least, the principal object of my invention, and
it also will be apparent to those skilled in the art
that the embodiment herein described may be
variously changed and modi?ed, Without depart
no
to permit relative lateral movement of said re
?ector means to bring respective portions out of
opposition and thus permit said re?ector means
to be moved substantially perpendicularly away
and thereby disassembled from said supporting
means; said re?ector means and said supporting
means including portion-s interengaging when
said re?ector means is in assembled position and
constructed and arranged thereupon to resist
said relative lateral movement of said re?ector
means.
.
4. An electric heater, comprising: supporting
means; electric heating means mounted upon
said supporting means; a re?ector; means for
‘ carrying said re?ector in position below said sup
porting means, including a plurality of ledge
means carried by and below said supporting
means and interengageable with underside por
not herein speci?cally described; hence it will
tions of said re?ector, at least one of said ledge
be appreciated that the herein disclosed em
means being provided by the jaw portion of hook
bodiment is illustrative only, and that my inven
means having a neck portion extending through
tion is not limited thereto.
an aperture in said re?ector, and said plurality
I claim:
of ledge means and said re?ector being relatively
1. An electric heater, comprising: electrical
so constructed and arranged that said re?ector
heating means; supporting means, supporting
said heating means, having a pair of spaced 7 1.) may be assembled with and disassembled from
said ledge means solely by relative bodily move
apart ledge means, and a hook portion, spaced
ment of said re?ector with respect to said ledge
from said ledge means; re?ector means, gener
means and generally edgewise with respect to
ally underlying said heating means and said sup
ing from the spirit of the invention, and that the
invention is capable of uses and has advantages
porting means, having a curved marginal sur
face, said re?ector means also having an aperture
said grid means.
5. An electric heater, comprising: supporting
2,418,536
means; electric heating means. mounted upon
said supporting means; a re?ector; ‘and hook
means for carrying said re?ector in position below
said'supporting means, said hook means and said
re?ector being relatively so constructed and ar
ranged that said re?ector may be assembled with
and disassembled from said hook means solely
by relative movement of said re?ector with re
spect to said hook means generally edgewise with
respect to said supporting means, said hook
means comprising a plurality of circumferentially
spaced depending hooks having jaws for receiv
ing circumferentially spaced portions of said re
?ector, said jaws all extending in the same gen
eral direction.
6. An electric heater, comprising: supporting
means; electric heating means’ mounted upon
said supporting means; a re?ector; and hook
8
means for carrying said re?ector in position below
said supporting means, said hook means and said
re?ector being relatively so constructed and ar
ranged that said re?ector may be assembled with
and disassembled from said hook means solely
by relative movement of said re?ector with re
spect to said hook means generally edgewise with
respect to said supporting means, said hook
10 means comprising a plurality of circumferentially
spaced depending hooks having jaws for receiv
ing circumferentially spaced portions of said re
?ector, said jaws all extending in the same gen—
eral direction, a plurality of said hooks having
neck portions outside of the outer periphery of
15 said re?ector and at least one of said hooks hav
ing a neck portion extending through an aperture
in said re?ector.
EDWIN L. WIEGAND.
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