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Патент USA US2406643

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Aqg. 27, 1946.
B_ splETl-l l
com/ECTION HEATER
Filed sept. 2, ‘1943
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2,406,643
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4V2 she‘etysheetl 1
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má; u @a
Aug. 27,1946.
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B. SPIETH'
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42,406,643
coNvEcTIoN HEATER
Filed Sept. 2, 1943
2 SheetsàSheet 2 l
@ß
2,406,643
Patented Aug. 27, 1946
UNITED
STATES
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PATENT OFFICE; »
2,406,643
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CONVECTION HEATER
Benjamin Spieth, Racine, Wis., assignor to-Mo
dine Manufacturing Company, Racine, Wis., a
corporation of Wisconsin
Application September 2, 1943,'seria1 No.> 500,877
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zolaims.
(01.257-1'36)
section through the front wall and damper illus
trating the hinge connection between them; and
This invention relates to a convection heater.
One object of the invention is to provide a
cabinet having an air inlet opening at its bottom
Fig. 8 is an enlarged fragmental verticalcross
section through a certain indicator blade and
' and a hot air outlet opening at its top, together
plate used in connection with the damper.
`‘Referring to said drawings,r which are merely
illustrative of one embodiment.> of lthe invention,
the reference character I0 designates the cabinet
ofr theheater, which is desirably rectangular in
with arheat transfer element disposed adjacent
the open bottom of the cabinet and adapted to
heat air passing upward through the cabinet.
Another object is to provide a damper con
trolled auxiliary air inlet to the cabinet of the
heater and disposed above the heat transfer ele 10 form and composed of sheet metal. Conven
iently the cabinet may compriseV a front wall II
ment whereby the heat output of the cabinet
having rearwardly extending flanges I2 at its
may be variedr from a maximum to a value ap
proachin'g zero.
side edges, and a rear wall I3 formed with for
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wardly extending side wall flanges I4 that over
Another object is to provide an auxiliary air '
inlet to the cabinet protected by a grille, to
lapy the front wall flanges and are secured 'thereto
gether with a damper to regulate the volume of
air entering the auxiliary air inlet, the damper
being so mounted thatit may close the grille
when in one extreme position and permit an
unrestricted flow Vof air through the hea'tingiele-`
in any desirable manner,
section wholly or in'part in` other positions and
justing the >damper to'any desired position be
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_"_ Another obj ect is to provide a convection heat
er vthat can be constructed economically and with
’a minimum number of parts and one that is
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novel features hereinafter fully described and
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in the drawings accompanying’this specification
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to the top wall adjacent the front and rear edges `
` Fig. 2" is a vertical crosssection taken on the
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bers IBa spot welded or otherwise rigidly secured
vFigiY is a -front elevation of the heater;
line ..2-2 oflî’ig. l; -
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and form the top wall »I la of the cabinet. The
~ top wall is provided with an air outlet opening
I5 which is protected by a grille l5. Conven
iently the grille I6 may comprise angle iron mem
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One embodiment of the invention is illustrated
ínwhich:
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The metal sheet that forms the front wall H
may be of greater length than that required to
form the front wall, and its upper end may be
bent rearward to extend in an inclined direction
30
With‘these and other Aobjects and advantages
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gether >,the lower ends of the front and back se
tions of the cabinet.
in view, this invention consists' in the several
claimed.
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face ofthe front wall. Bolts and nuts 'Ilmay be
employed for fastening the front wall vto -the
bracketsV 9. Shoulder _rivets |50'l secured to the
flanges Iland extending through notches in the
flangesl I2, may be employed for fastening to
permit an unobstructed flow of air through the
auxiliary air inlet, together with meansfor ad
highly efñcient in operation.
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lapping side wall flanges I2-«I4 is illustrated in
Figs. 2 and 6 and comprises L-shaped brackets
9, one spot welded or otherwise rigidlyv secured
toe'ach side wall flange I4 and formed with a
flanged arm 8 which r_bears against the inner
'ment and cabinet, or it may cover the heating
tween its two extreme positions. i _Y .
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One form of securing means between the over
of the ,opening therein, and spaced bars IBb
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.- ,.Fig'. 43v is a vertical longitudinal> section taken
intermediate lthe angle iron membersand rods
thelin’e 3+3`of Fig. 2, andshowing part of
the heater broken away.A Figs.V 2 and 3Á are upon
or Wires-IBC that extend through the angle iron
members fand bars. The metal which forms the
top- _wall [I a is bent downwardly at thel side edges
‘zi-¿slightly enlarged scale; „
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of the top wall to form flanges I2a` that are'in
eñect continuationsof the flanges I2 of the _front
wallland overlap the> side wall flanges I4 as is
seen at IZUinFig. `3. At the places where the
detail horizontal section ’
taken‘on; the- -lineflIf-A of Fig.; 2,. illustrating the
. 1 Fig. .4 is an enlarged'
y(italianer contrcllingmecha‘nism and a fragment
of thedáïrlperîtself; ' ï
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Fig. 5 is a vertical cross section ofthe damper
.controlling mechanism and damper showing the
. flanges I2V and Iza-_I4 overlap each other the
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lattenin its closed position with respectto the
auxiliary air-inlet;
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Fi`g.j6-i's` a 'detail' horizontal section taken on
y incliner-s of' rig. 2;,
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‘ Fig. 7 is anenlarged'fragmental verticalv cross -
side wall ñang'es I4 are, offset inwardly «to receive
the overlapping portions of ` the ñanges I2 and
I ¿2a',`whereby the outer faces of the side walls
may be hush. The rear end of the top> wall
maybe bent downwardly to provide an upright
flange I Ib that extends contiguously with. the in
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ner face of the rear wall I3, and an air seal llc
may be provided at the upper inner corner of
bracket members provides space for the reception
of the headers close to the side walls of the cab
inet and also provides a confined passageway for
For reinforcing the front wall a horizontally ex
the ascending heated air that rises from the heat
tending V-shaped reinforcing member lila may 5 transfer element.
be spot welded or otherwise secured to the inner
In the front wall H of the cabinet, directly
face of the front wall.V The rear wall may be re-_
above the heat transfer element, is an auxiliary
the cabinet.
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inforced with horizontally extending channel bars
13a, riveted or ‘otherwise fastened to the rear wall.
air inlet 4U which is protected by a grilled! that
extendsl across the opening, directly behind it.
Conveniently the heater is supported above the
Desirably the grille may comprise horizontal angle
ñoor of the room in which it is contained by
mounting it on a wall of the room by bolts which
pass through the channel bars i3d. A sheet of
heat insulating material 13b may be secured to
the outer face of the rear wall to prevent an ex
Y iron bars 42, intermediate bars 43 and vertical
rods or tubes 44 extending'through said bars.
The horizontal flanges of the angle bars 42 are co
cess amount of heat from radiating from the rear
wall.
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incident with‘the upper and lower edges of the
auxiliary air inlet. Upright bars 45 that are co
incident with the side edges of the auxiliary air
inlet connect the angle iron bars 42 and together
with said angle iron bars provide a throat which
extends inwardly from the marginal edges of the
auxiliary air inlet. The` grille is fastened to the
inner face of the front wall by spot welding the
angle iro-n bars 42 thereto or by any other suitable
Adjacent the open bottom of the cabinet is a
heat transfer element I1 which is supported from
the side walls of the cabinet, and in the present
embodiment of the invention the heat transfer
element comprises a plurality of parallel fluid
conducting tubes I8, l8a headers Ill-20 con
fastening means.
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nected to the ends of the tubes and heat radiating
ì For regulating the volume of air admitted to
fins 2 I--22 through which the tubes extend. The 25 the cabinet through the auxiliary air inlet, a
headers are of particular construction and are
damper 43 is provided for closing or partially clos
more particularly shown and described in my co
ing the auxiliary air inlet or forleaving said inlet
pending. application Serial No. 500,876, filed ySep
entirely free and clear for the unrestricted flow
of air therethrough,
I
tember 2, 1943, to which reference may be had for
a fuller description.
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Desirably the damper is in the form of a rec
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Briefly, each header comprises a seamless tube
tangular piece of sheet metal having one section
of` suitable dimensions of octagonal, hexagonal or
41 thereof bent at a slight angle to the main sec
other vmany-sided configuration. The bore 23 of
tion 48. The damper is hingedlyconnected on a
the header is cylindrical and the wall thereof is
horizontal axis to an angle shaped hinge plate 49
threaded at Vboth ends for the reception of a pipe 35 which is spot welded or otherwise secured to the
fitting 24 or 24a or a screw plug 25 or 25a. Holes
front wall of the cabinet, Cooperating with said
are drilled in the sides of each header for connec
hinge plate 49 is a hinge plate 50 secured to the
tion with the ends of the tubes. The several parts
inner or under side of the damper. The adjacent
of the heat transfer element may be brazed to
ends of both of these hinge plates are curled to
gether or otherwise integrally united in accord
form hinge ears 5| through which extends a hinge
pin 52.
ance with the common practice.
As’illustrated, the heat transfer element is in
' The damper is of such dimensions that when
tended for use in a two pipe heating system. The
elbow fitting 24 connects with a steam or hot
closed over the auxiliary air inlet the main section
48 covers the auxiliary air inlet grille 4I thereby
water supply p-ipe 28 and the elbow ñtting 24a
excluding the 'admission of air through the aux
iliary air inlet and when fully opened to its other
extreme position the'damper closes or substan
tially closes the hot air passage between the in
wardly spaced parts 31 of the bracket members
connects with a return pipe 30. If desired an air
valve 31 may be provided at the discharge end of
the heat transfer` element and in that event the ,
screw plug 25a at the discharge end may be drilled
and tapped for the reception of the threaded nip
ple of the air valve.
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50 35 and the front and rear walls of the cabinet.
The ñrst mentioned position of the damper is il
For giving additional support to the headers,
lustrated in Fig. 5 and its second mentioned posi
the endV fins 2l are preferably constructed of
tion isillustrated in -dotted. lines in Fig, 2. The
heavier gauge metal than the intermediate fins 22,
damper may assume any position'intermediate
and the lower ends of these end fins extend at 55 these extreme limits, one such position being _il
right angles to the main upright parts 33 thereof
lustrated in solid linesVV in Fig. 2.
to provide horizontal flanges 34 which are formed
For adjusting the damper and holding it in
with holes for the reception of the lower ends of
any position of adjustment, damper controlling
the headers.
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means have been provided which conveniently
Secured to the side walls I4 of the cabinet and 60 may comprise a threaded stem 53 having a swiv
extending from the front wall to the back wall,
eled connection with thefront wall of the cabinet
and being threadedly engaged in a trunnion nut
arebracket members 35 which are formed with
oppositely directed upright portions 35v and 31
54 which is provided with trunnions 55 that are
bent at right angles to their horizontal portions
swiveled in bracket arms 5S, bolted or otherwise
3B. The upright portions 36 are contiguous with l65 secured to the damper as by bolts and nuts 51.
l the side walls of thevcabinetvand are rigidly se
Conveniently the bracket arms 5B are angle
cured thereto as by spot welding or otherwisejand
shaped and their flanges or webs 58 extend par
the upright portions at 31 are spaced inwardly
allel to each other‘and receive the trunnions of
from the side walls a distance somewhat greater
the trunnion nut with their flanges or webs 59
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than the diameter of the headers, and the lower 70 bolted to the damper.
ends of said upright portions 31 of the bracket
The threaded stem _53 is formed with asplndle
60 which is rotatively mounted in a trunnion
members are 4bolted orotherwise rigidly secured to
bearing 6| that is formed ywith coaxially disposed
the upper ends ofthe end ñns 2| of the heat
transfer element as by bolts and nuts 39.- The in
oppositely extending trunnions B2 that are
ward spacing of the upright portions 31 of the .75 .swiveled in sockets _63 that _may be formed by
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' striking up the metal of the front wall and the
understood as limiting myself to the exact form,
hinge plate 49 to form semi-circular depressions
which when matched up provide cylindrical bear
construction, arrangement and combination of
ings for the trunnions. The metal of the front
wall and hinge plate between the struck up por
tioned.
tions is cut away for the reception of the trun
nion bearing 6|. A knob or handle 64 is secured
Letters Patent is:
1. A convection heater comprising in combina
upon the outer extremity of the spindle 60 as by
Va screw 65. The threaded stem is held against
tion a cabinet having an air inlet opening, an
air outlet opening and an auxiliary air inlet in
longitudinal movement with respect to the trun
parts herein shown and described, or uses men
What I claim as new and desire to secure by
10 termediate the air inlet and air outlet openings
nion bearing by the knob on one side and the
shouldered end of the threaded stem on the other
side.
and spaced from said air inlet opening, opposite
ly disposed bracket members rigidly secured to
the damper.
inwardly spaced depending bracket portions and
the side walls of the cabinet and formed with
inwardly spaced depending portions, a heat
For indicating to an attendant the various posi
tions of the damper, an arcuate indicator blade 15 transfer element having iins thereon, the end
most ones of which are secured to said depend
66 is provided which has a flat portion 61 that
ing portions of the bracket members and to
is inserted between the damper 4B and the
gether with said bracket members divide the
flanges 59 of the bracket arms 58 and secured
lower part of the cabinet into a heating chamber
thereto by the bolts and nuts 51. An arcuate
indicator plate 68 having suitable indication 20 :and two end chambers, the heat transfer element
having heating tubes in said heating chamber
marks thereon is secured upon- the external face
and headers in said end chambers, and a piv
of the indicator blade 66 and cooperates with one
otally mounted damper extending between said
of the grille bars 43a to indicate the position of
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In the operation of the heater a fluid heating 25 arranged in one position to close the auxiliary
air inlet, and arranged in another position to
medium such as steam or hot water is supplied to
close the passageway between the depending
the heat transfer element and air entering the
portionsv of the bracket members, said damper
open bottom of the cabinet becomes heated as it
having means for adjusting it to any position
passes the heat transfer element, and rises in the
cabinet when the damper is in its position clos 30 between its limits of movement'.
2. A convection heater comprising in combina
ing the auxiliary air inlet or in any of its in
tion a cabinet having an air inlet opening at the
termediate positions, and discharges through the
bottom and an air outlet opening at the top and
outlet opening in the top of the cabinet.
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an auxiliary air inlet in the front wall of the
If it is desired to have an unrestricted flow of
hot air through the cabinet, the damper regu 35 cabinet intermediate said inlet and outlet open
ings, bracket members rigidly secured to the side
lating knob B4 is turned in the proper direction
to swing the damper into the closed position seen
walls of the cabinet and being formed with de
in Fig. 5, wherein the damper completely closes
pending portions spaced inwardly from the side
the passage through the auxiliary air inlet. With
walls, a heat transfer element in the cabinet
the damper located in the closed position just 40 below said bracket members and having headers
disposed in the spaces between the side walls and
described, a maximum heat output is obtained.
the depending portions of the bracket members,
If it is desired to reduce the heat output to a
value approximating zero, the damper control
said heat transfer element having also fluid con
ducting tubes connecting said headers and ex
ling knob is turned in the proper direction to
tending in the space between said depending por
swing the damper into the position shown in
dotted lines in Fig. 2y wherein it practically
tions of the bracket members, and L-shaped ñns
closes the passageway through the cabinet at a
secured to said tubes and to said depending por
place directly over the heat transfer element, and
tions of the bracket members, and being formed
with horizontal apertured flanges in which the
at the same time completely uncovers the aux
iliary air inlet, permitting an unrestricted flow 50 headers are held, said depending portions of
of cooler air into the cabinet, which is heated
‘ the brackets and L-shaped ñns dividing the
slightly by heat radiated from the damper, and
rises through the cabinet, finally discharging
lower part of the cabinet into a heating chamber
for the tubes and end chambers for the headers,
and a damper extending between said depending
from the outlet opening in the top thereof.
Having thus described my invention, it is ob
vious that various immaterial modifications may
Abe made in the same without departing from the
spirit of my invention; hence I do not wish'to be
inwardly spaced portions of the brackets and piv
otally mounted on an axis disposed adjacent the
lower edge of the auxiliary air inlet.
BENJAMIN `SPIETH~
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