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Dec. 24, 1946.
Filed Aug. 14. 1942
2 Sheets-Sheet l
jery'cun £72;
Dec. 24, 1946.
Filed Aug. 14. 1942
2 Sheets-Sheet 2
anzz'n x2016
Patented Deco 24, 1946
2,413,118 '
um'rso s'rA'rss PATENT orrlcs
‘ 2,413,118
Benjamin Spicth, Racine, Wis., assignor to Modine ,
Manufacturing Company, Racine, Wis., a cor
poration of Wisconsin '
Application August 14, 1942, Serial No. 454,757
2 Claims.
The present invention relates to a unit heater
of the class which is commonly used for the
comfort heating of relatively large enclosed
spaces such as shops, work-rooms, show-rooms, '
o?ices and other similar enclosures. The inven
tion is more speci?cally directed to the new and
novel arrangement and construction of the es
sential cooperating mechanisms which have been
(or. 98-40). >
l0 may be connected as desired for conducting
the cooled heating medium away from the‘unit
heater back to the heat source. The plurality of
tubes which are preferably of relatively small
' diameter are disposed parallel in a manner illus
trated in Figs. 1 and 2, and they‘ may be ar
ranged parallel in rows'as shown or in staggered
relation if desired. Since vthe ends of the tubes
so combined and assembled as to form a very
9 are welded or brazed to the spacedheaders
simpli?ed and compact unit having a minimum 10 they form a rigid heat medium conducting sys
number of parts.
tem which substantially constitutes the skeleton
A further object of the present invention is
framework or backbone of the present unit heater;
the novel construction of the vanes or de?ectors
The .tubes 9 hereinbefore referred to are con
nected by a plurality of fins I i which are pro
which are used in combination with the fan
housing to direct the air into the room in such 15 vided and function as extended heat transfer
a manner as to provide the best hot air circula- .
surfaces in addition to the heating surfaces pre
tion for the particular space which is heated by
sented by the tubes, thereby creating an ef?cient
the unit heater. The de?ectors are adjustable
heater core which will readily transfer most of
and may be regulated after the unit heater is
the heat to the air which is forced between the
installed and obviously may be maintained in the 20 ?ns and around the tubes‘by means of the cir
most e?icient de?ecting position after the latter
culating fan l2. The fan I! is driven by a motor
l3 which is positioned and supported through the
has once been determined by a trial run of the
unit heater in the enclosure to be heated thereby.
means of a pair of saddle brackets l4 and I!
All other objects and advantages of the present
which are bolted or spot welded or otherwise se
device shall hereinafter appear in the following 25 cured to the vertically disposed U-shaped' brack
detailed description having reference to the ac
ets l6 and I l which form spaced hangers for
companying drawings.
supporting the entire wind driven unit._ It is also
In the drawings:
possible to modify the shape 01' the main fan unit
Fig. 1. is a rear elevational view of the unit
supporting brackets I 6 and I1 centrally thereof
heater of the present construction as viewed 30 to follow the contour of and connect with the
from the fan or intake side thereof. '
motor in the manner of brackets i4 and i5 and
Fig. 2 is a side elevational view of the heater
in that event the latter may be eliminated.
illustrated in Fig. l.
The straps or hangers i8 and ll bridge the.
Fig. 3 is a perspective view of one of the ?ns
heat exchange core and are of relatively thin
of the heat transfer surfaces which is utilized to 35 cross-section disposed edgewise in the path of
constitute a part of the fan housing;
the air stream to reduce the air resistance there- '
Fig. 4 is 'a perspective view of one of the vanes‘
of and the top less it and I 9 of the brackets
it and ii are brazed, welded. or otherwise rig
idly connected with the upper header 6, while the
of the housing comprising the fan hood, perse, 40 lower legs 20 and 2! of said hangers l6 and I1,
as taken substantially along the line 5-4 in
respectively, are similarly connected or secured
or heat de?ectors, and
Fig. 5 is a central sectional view of the portion
Fig. 1.
Referring to Figs. 1 and 2, the unit heater of
to the lower header or tank 7.
From the foregoing description, it will be ap
the present invention is provided with an upper
parent that the two headers and their connect
inlet header 6 and a lower return header 1. The 45 ing tubes are reinforced mechanically by means
upper header is provided with an inlet fitting 8
of the horizontally disposed ?ns Ii joining all of
which may be suitably connected with any form
said tubes. The motor driven fan is likewise
rigidly disposed and suspended by the brackets
of heat source which may provide hot water,’
steam, or any other form of heating medium or
i8 and H in a.v de?nite and desirable predeter
?uid. A plurality of tubes 9 are connected to 50 mined relation with respect to the main skeleton
the upper header ‘6 and the lower header 1 in
of the unit heater with the latter forming the
the usual. manner as by welding or brazing, and
heat transfer unit which supplies the heat to the
constitute the heating portion of the heater core
air driven therethrough by means of the fan l2.
, and are adapted for conducting the heating me
By this arrangement, the tubes 9 and the brack
dium from the tank or header 8 to the lower tank 55 ets i6 and I1 all connect the two headers so that
or header 7. From the latter, a suitable outlet
tubes 9 which form the skeleton or backbone of .
._ -
the unit are also reinforced'through the parallel
connections of the headers by the fan unit sup
porting brackets l3 and i'l.
In order that the air heated by the unit heater
shall be directed through the heating unit in the
proper and desired direction and‘ that none of the
heat or air‘ shall be dissipated from the direct or
main air stream through the heater, a suitable
best illustrated in perspective in Fig. 4. Each of
the de?ectors 33 is provided with a pair of ears
3‘! and 38, which may be inserted through the
holes 35 of the oppositely related sides 33 and 34
by springing the latter sides. Subsequently ears
31 and 38 may be bent against the sides of the
housing 22 to hold the de?ectors against move
ment and to connect the same with extended sides
33 and 34 of the fan hood 30. This eliminates the
fan hood or casing indicated by 22 in its en
tirety is constructed for the purpose of controlling ll) use of any other forms of fastening devices such
as the nuts and bolts or screws, and at the same
the direction and concentrating the air stream
time the de?ectors are rigidly held in place and
before and after it leaves the heating unit proper.
cannot be shaken loose by vibration of the in
There are various ways in which the fan hood
unit nor do they have any looseness which may
may be constructed and in the present device the
tend to produce objectionable noises as theair
extreme top and bottom fins 23 and 24 of the
is blown therethrough. The spaced de?ectors also
heater are enlarged so as to ‘extend forwardly and
aid to hold the sides 33 and 34 against the ends
rearwardly with respect to the remainder of the
of the heating core comprising the tubes 3 and
?ns II as best illustrated in Fig. 2. In addition,
the ?ns I I, adding further rigidity to the open end
the top and bottom ?ns 23 and 24 are provided
with pairs of ?anges 25 and 26, respectively. The 20 of the casing 22.
In order to obtain the adlustment of these de
construction of the upper ?n is very clearly indi
?ectors for each particular installation, aligned
cated in Fig. 3, which shows the ?n 23 as provided
notches 40 and 4| are provided near or adjacent
with the ?anges 25 hereinbefore referred to, said
each of the ears 3'! and 38 in amanner best illus
?n also having suitable openings 28 for the re
trated in Fig. 4, whereby relatively narrow strips
ception of the tubes 9.
The ?n 23 is also made with an extended end
23 forming an air de?ector which may be bent
up or down as best determined after the installa
tion of the unit to obtain the proper air de?ec
or bands of metal 42 and 43 are produced which
can be ?exed as the ends 44 of the de?ectors are '
moved upwardly or downwardly into various po
sitions as best illustrated in the dotted lined po
tion at this point. Although the lower ?n is not 30 sition in Fig. 2. Obviously, these de?ectors may
easily be replaced should the ?exing portions
provided with a de?ector, this may or may not be
thereof become ruptured, but it will seldom be
desirable and in all other respects the lower ?n
24 is identical with the upper ?n 23 but reversely . necessary to adjust the de?ectors more than once
or twice since only one or two settings thereof are
positioned. The remainder of the fan hood .or
housing, part'of which is formed of the ?ns 23 35 usually necessary to determine the best position
for the de?ectors, and thereafter no further ad
and 24 as the top and bottom thereof, comprises
a U-shaped member 30 illustrated in Fig. 5, which ' justment will be necessary.
Thus it will be seen that the invention provides
is adapted to be connected with the ?anges 25
a new and novel arrangement, and simplified con
and 28 of the upper and lower ?ns 23 and 24,
respectively. The housing 30 is also provided with 40 struction of unit heater which utilizes a minimum
of metallic elements and wherein certain por
an opening 3i which is slightly larger than the
sweep of the fan blades l2 and acts to concentrate
the intake air as the latter is forced into and
through the heating unit by means of the fan.
tions of the heating transfer unit per se also pro
vide the main skeleton and backbone of the en- _
the unit heater.
Having thus described the invention, it is ob
vious that various immaterial modi?cations may
be made in the same without departing from the
to and supported from certain of the ?ns of the
general scope and ?eld of this invention; hence,
heating unit which also form an integral portion
it is not to be understood that the present device
of the complete housing. With certain of the
?ns such as 23 and 24 of the core forming the top 50 is to be limited to the exact form, construction,
arrangement and combination of parts herein
and bottom of the fan casing 22 and by securing
shown and described or to the uses mentioned.
the remainder of the fan hood to said ?ns, some
What I claim as new and desire to secure by
of the heat from the core is dissipated to the cas
Letters Patent is:'
ing directly by conduction as well as by radiation
1. An air de?ector for connection with oppo
50 that the casing will also act to heat the fan '
site walls of an air casing comprising a vane, 0p
air while functioning to direct and concentrate
positely related ears for insertion in openings in
the air stream from the fan.
said casing walls for ?xedly securing said vane
Although the present drawings illustrate the
into one position in said casing, and aligned slots
housing as manufactured from sheet metal or
other relatively thin metallic members, it will be 60 at the opposite ends of said-vane and adjacent
said fastening ears providing narrow vane sec
relatively simple to substitute the main portion
tions contiguous with said ears whereby the whole
of the housing 30 with non-metallic materials
vane may be ?exed relative to said casing to ob
such as plastics 0r Masonite in order to further.
avoid the necessity of using metals in the man
tain the desired. air de?ection.
I 2. An air de?ector for a hot air heat exchange
. ufacture of the present unit heater. The fan
unit casing comprising an elongated vane formed
hood or housing 30 can also be made of separate
separately from the casing, oppositely directed
parts, namely, an apertured back wall with two
side walls and this may be preferable when using
cars at the ends of said vane extending through
thicker materials other than metal.
slots in opposite walls of the casing for securing
As an additional means to vane 23 for de?ect
the vanes to said opposite walls and weakened
portions adjacent said ears extending lengthwise
ing and directing the heated air from the front
face of the unit heater, the extended sides 33 and
of the vane to permit ?exing of said whole vane,
34 of the fan hood 30 are provided with apertures
relatively to said casing to adjust the vane for de
as at 35 in Fig. 2, which are aligned and conven
?ecting hot air expelled from said hot air unit.
iently arranged receive de?ectors 33 which are. 75
From the foregoing description, it will be seen
that the fan hood or housing is directly secured
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