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Патент USA US2113739

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_. Patented Aprriz, 193s
2,113,739
UNITED ‘STATES PATENT
1
v
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OFFICE
2,113,139
roman DRAFT UNIT‘ FOR. FLOOR
FURNACES
‘ Robert E. Newman, Los Angeles, Calif; assignor
to The Coleman Lamp and vStove Company,
' WichltayKans” a corporation of Kansas
Q I 1 v"Application April 11, I936, Serial No. 73,912
6 Claims.
(on. vice-11o)
‘This invention‘relates to heaters and particu- ~ ‘I. The air upon contacting the heater unit be
larly to that class of heater for use in dwellings
or the like which have no cellar or basement and
are designed for suspension from the ?oor joists
5‘ so that theylarecommonly known as?oor fur
‘naces. The invention has to‘do more particu
larly with a general type of ?oor furnace similar
to that disclosed in the patent to R; E. Fraser of
March 20, ‘1934, Number 1,952,009 in which air to
1;) be heated 'is normally circulated by thermic 'ac
‘ tion downwardly within anouter casing and up
comesheated and rises upwardly through the
grill for return to the room. Some of the cool
air moves upwardly through the air heating ?ue
l2 and is heated sufllciently therein so that it‘ 5
moves with a velocity to direct an up draft‘
through the furnace to maintain circulation of
the air.
wardly through” av vertical heating ?ue.‘ I have
found that in many installations the air‘doesnot
circulate with su?icient velocity and volume'to
l5 obtain maximum heat recovery from the com
,
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'
impel it upwardly through the heating ?ue l2,
thereby positively increasing the velocity and
busted fuel and that it is desirable to provide
mechanical means for vincreasing ‘the air cir
Qculation through the furnace.‘
'
‘This general construction of the heater and
its operation is all old and well known but many 10
times it is desirable to increase the up draft
through the ?ue H by providing a forced draft
unit including a motor driven fan that is sup
ported below the lower end of the ?ue l2 to draw
the air downwardly through the space l3 and 15
_
Q My invention therefore contemplates a novel
20 ‘unitary forced draft‘ unit, for impelling air up
{through the heating ?ue, the unit being so'de- "
,» signed and associated with the. heating ?ue that
volume flow of air through the furnace. In
‘mounting the unit I ?nd it desirable that the
motor be located exteriorly of the casing I so that ‘
it is out of the heat in?uencing zone'of the heater
0
‘and removed from the‘ path of the circulated air.
The motor‘ is thus not only protected from the
repairs.- The novelty of the invention willbe ‘dust carried by the air but also from the dust and
25 apparent by reference'togthe‘following descrip
dirt dropping through the grill into the heater 25
H ‘tion in ‘connection withithe accompanying draw-4 ‘casing. Another advantage is that the motor
‘ ‘it may be easily removablefor inspection and
.inginwhich:
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I.
I
‘
' does not overheat and the lubrication is more
Fig. 1 is a fragmentary perspectiveviewof a
heater to which my invention is applied.
50
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effective since the motor is located within the
relatively cold air surrounding the casing of the
heater. Provision is made, therefore, to carry 30
Fig. 2 is a detailisection through the lower por
tion of the heater’casing and air heating ?ue, par- I the forced draft unit by the bottom 4 of the cas: ‘
ticularly illustrating; installation .of the forced" ing l, with the ‘axis of the motor located in con
draft unit. , centric alignment with the axis of the air heat
I designates the heater casing‘ which is pro-v ing ?ue. Owing to the fact that‘ the motor is
35 vided with opposed vertical walls,‘2-2' and 3—3'
and a bottom 4. The casing l is suspendinglyv
connected with the ?oor 5 by any suitable means
and. it isyprovided at its top with a removable
register or grill 6 covering the open top thereof
40 in substantially the plane of the floor. A heater
supported exteriorly of the casing I, and due to' 35
the'fact that'the exterior of the casing is‘not
accessible after installation of the furnace, pro
vision is made'for servicing the forced draft unit
by withdrawing it through the up draft ?ue.
When thus withdrawn theunit is readily inspect-1 40
(‘unit 1 is disposed within the casing I and it is ‘ ed and; lubricated without removal of the heater
casing- In carrying out my invention I provide
‘ provided at its bottom with a burner 8 supplied
from any suitable source to heat‘the air surround
ing the heater unit ‘I, the unit‘! having an outlet
45 9 at. its top discharging into a down draft ?ue Ill
; and out through a pipe ll. Within the down
draft ?ue i0 is an air heating ?ue [2 having its
lower end spaced from thebottom 4 to provide
‘
communication with the space l3 between the
50‘ casing l_ and a jacket, N that encloses the heater
casing ‘I. The cold air to be heated gravitates
‘from the room through the grill 6 and moves .
an opening I5 in the bottom 4 of the casing l and
locateddirectly below’ the ?ue l2’ to pass the
motor it of the forced draft unit. The electric 45
motor It carries a shaft l1 on the end of which
is an impeller or fan I8 to force the air up through
the ?ue l2. The upper end of the motor also
carries a plate ‘l9 of suf?cient diameter to over
lap the peripheral edge of the opening l5 so that ‘ 50
when the motor is in place'the periphery of the
plate rests upon the bottom‘ of the casing I‘ to
" downwardly through the space- i3 and under the ' support the unit and to provide a tight seal about
lower edge. of the jacket H for upward passage the opening. In order to guidingly support the
‘35 in heat contacting relation ‘with the heater unit unit the plate l9 carries a plurality of vertical 55 ‘
2
2,113,789
?ngers 20 which are of sufficient length to pro
in said opening and extending exteriorly of the
jectingly engage the lower end of the ?ue I2
when the plate I9 is seated on the bottom of the
ing and for suspendingly supporting the motor
casing, means on the motor for closing said open
casing I, as clearly shown in the drawing. When
from the bottom of the casing, a fan carried by
the forced- draft unit is thus supported the motor
extends below the bottom of the casing I and it
is provided with terminals 2| and 22 to which
the motor, and means on said supporting means
the conductors 23 and 24 are attached. The con
ductors 23 and 24 are ?exible and have sui?cient
10 slack to permit removal of the forced draft unit
through the open top 25 of the ?ue l2. In order
to facilitate removal of the unit the top of the
shaft I1 is provided with an eye or loop 26 so that
a hooked rod (not shown) may be inserted
15 through the open top 25 in the ?ue I2 to permit
the hook to engage the eye or loop 26 so that the
complete forced draft unit may be lifted up
through the ?ue l2 for inspection and repairs.
It is to be understood that the forced draft unit
is installed and the electrical connections are
made thereto prior to placement of the heater
casing.
for centering said forced draft unit relatively to
the air heating ?ue.
3. In combination with a ?oor furnace includ
ing a heater unit, a burner in the heater unit, an
air heating ?ue extending through the heater 10
unit, a casing for the heater unit having an
open top normally covered by a grill and a bot- '
tom provided with an opening aligning with the
air heating ?ue, a forced draft unit for effecting
circulation of air downwardly within the outer 15
casing for discharge of the air through the grill
by the way of said ?ue including a motor located
in said opening and extending exteriorly of the
casing, means on the motor for closing said open
ing and for suspendingly supporting the motor, 20
a fan carried by the motor, and means connected
with said forced draft unit and adapted to be
‘ When it becomes necessary to remove the
forced draft unit as when making an inspection
25 or repairing and lubricating the motor, the grill
6 is removed. The hooked rod above mentioned
is then lowered through the open end 25 of the
?ue l2 to engage the hooked end thereof with
the eye or loop 26. The rod is then withdrawn,
30 bringing out the forced draft unit including the
engaged by a hooked rod for removal of said
forced draft unit upwardly through said ?ue and
through the open top of the casing.
25
4. In combination with a floor furnace includ
ing a heater unit, a burner in the heater unit, an
air heating ?ue extending through the heater
unit, a casing for said unit having an open top
normally covered by a grill and a bottom pro 30
vided with an opening aligning with the air heat
conductors 23 and 24, the unit being guided up
wardly within the ?ue by the relatively close en
ing ?ueLa forced draft “unit for circulating air
gagement of the ?ngers 20. After the unit has
downwardly within vthe outer‘casing for discharge
been serviced it is readily lowered by means of through said grill by the way of said ?ue in
the hooked rod into the open end of the ?ue l2
cluding a motor located in said opening and
and guided by the ?ngers 20 so that the motor l6 extending exteriorly of the casing, means on the
passes through the opening l5. When the plate motor for closing said opening and for sus
l9 has been seated on‘the bottom of the casing pendingly supporting the motor from the bot
the hooked rod is disengaged from the eye or
tom of the casing, a fan carried by the motor,
40 loop 26 and the rod withdrawn, leaving the unit
means on said supporting means for centering 40
in centered relation with the lower end of the ?ue said forced draft unit relatively to the air heat
due to the engagement of the terminal ends of
ing ?ue, and means connected with said unit and
the ?ngers 20. The grill 6 is then replaced to v- adapted to be engaged by a hooked rod for re
continue the operation of the furnace. It is thus moval of said forced draft unit upwardly through
45 obvious. that this arrangement makes for_con
said ?ue and through the open top of the cas 45
venience in assembly and for inspection and re
ing when the grill is removed.
pairs of the forced draft unit and renders it
5., In combination with a ?oor furnace includ
easily accessible.
ing a heater unit, a burner in the heater unit, an
What I claim is:
air, heating ?ue extending through the heater
50
1'. 'In combination with a ?oor furnace includ
ing a heater unit, a burner in the heater unit, an
air heating ?ue extending through the heater
unit, a casing for the heater unit having an open 60
top normally covered by a grill and a bottom
provided with an opening aligning with the air
heating ?ue, a forced draft unit for circulating
air downwardly within the casing for discharge
55 provided with an opening aligning with the air ’ through the grill by way of said air heating ?ue 55
unit, a casing for the heater unit having an open
top normally covered by a grill and a bottom
heating ?ue, a forced draft unit for circulating
air downwardly within the casing for discharge
through said grill by the way of said ?ue
including a motor located in said opening and
60 extending exteriorly of the casing, means on the
motor for closing said opening and for suspend
ingly supporting the motor from the bottom of
the casing, and a fan carried by the motor for
forcibly discharging the circulated air through
65
said ?ue.
,
2. In combination with a ?oor furnace includ
ing a heater unit, a burner in the heater unit,
an air heating ?ue extending through the heater
‘ unit, a casing for the heater unit having an open
70 top normally covered by a grill and a bottom
provided with an opening aligning with the air
heating ?ue, a forced draft unit for circulating
air from said open top and downwardly with
in the casing for discharge through the open top
75 by the way of said ?ue including a motor located
including a motor located in said opening and
projecting from the exterior of the casing, means
on the motor for closing said opening and for
suspendingly supporting the motor from the
bottom of the casing, a fan carried by the motor, 60
and guide means on said supporting means hav
ing upwardly extending ?ngers guidingly engag
ing the inner surface of the air heating ?ue for
centering said forced draft unit relatively to the
?ue.
6. In combination with a ?oor furnace includ
ing a heater unit, a burner in the heater unit,
an air heating ?ue extending through the heater
unit, a casing for the heater unit having an open
topnormally covered by a grill and a bottom pro 70
vided with an opening aligning with the air heat
ing ?ue, a forced draft unit for circulating air
downwardly within the outer casing for discharge
through the grill by the way of said air heating
?ue including a motor projecting through said 75
8,118,789’
opening to the exterior of the casing, a plate
on the motor for closing said opening and for
suspendingly supporting the motor from the
bottom of the casing, a fan carried by the motor,
radially extending members on the plate and
having ?ngers projecting upwardly within the
lower end of the air heating ?ue for centering
3
said forced draft unit relatively to the ?ue, and
means connected with said forced draft unit and
adapted to be engaged by an elevating tool for
moving said forced draft unit through the up
draft ?ue to and from support by said bottom.
ROBERT E. NEWMAN.
5
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