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Патент USA US2106642

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Jan. 25, E933.
Filed Dec. 15, 1935
2 sheetsfsheet `1
Jan. 25, 1938.
Filed Dec. l5, 1955
2 Sheets-Sheet 2
Patented Jan. 25, 1938
George D'. Matthews, Chattanooga, Tenn., as
signor to Tennessee Stove Works, Chattanooga,
Tenn., a corporation of Tennessee
Application December 13, 1935, lSerial No. 54,291
3 Claims.
(Cl. 126-67)
My invention relates to circulating heaters, and
more particularly to latches and openers, for
stoves, furnaces and the like.
It has been the practice in the prior art of
5 stoves and especially circulating heaters to em
ploy an outer and an inner casing and a door
made of spaced inner and outer >portions in the
side of such casings and hinged thereto for per
mitting the insertion of coal or other fuel into
10 the inner casing. Ordinarily such a door is main
tained in closed vposition by a securing means of
such construction that a handle extending from
the outer surface of the door may be rotated and
its operation.
I have for a further object the introduction
of a foot actuated means for releasing the latch
and additional means for forcing the door to open 5
position after the latch hasbeeri released where
by the party is freexat all times to transport icoal
in both hands without inconvenience.
It is a further object of my invention to -pro- n
vide a door which may be latched in position Vby I0
merely pushing it to closed position, and maybe
opened by pulling.
It is a still further-object of my invention to
may move an inner catch secured to the inner
employ a spring actuated latch for securing the
surface of the door whereby it is wedged against
the wall of the inner casing thereby holding 'the
door in closed position. Examples of this type
of construction are disclosed in Sperry, 1,644,900
door or doors in closed position, and in .position-“l5
ing said spring Where heat >from the stove will
not attack and effect its’ resilient properties.
In the prior art such patents as Schutz, 1,256,
934, disclose spring actuated latch means coop-,x
erating with ibeveled surfaced seats -for main- 20
-and Simons, 1,713,782.
' 2
foot movement of its elements in order to insure _
The disadvantage of this type of construction
is that the wedge or latch is exposed to the fire
where it may be decomposed or consumed by the
excessive heat of such ñre, so that very shortly
' it Abecomes ineffective 'as a latch and no longer
can serve to secure the door. Another disadvan
tage is occasioned by the necessity for vusing an
outer 'handle adapted to be gripped by the hand
and turned. The extension of such handle from
the door permits impact and contact with other
30; Objects thereby permitting it to be broken or
injured to »such an extent that it is in no ‘condi
~tion to perform its-proper functions after a very
short usage. Furthermore .after some usage this
structure is no longer able to maintain the door
in tight closed position thereby permitting air
to yenter the stove. Each of' these vdisadvantages
‘ contributes to avery unsatisiactorylatch.
In the aboveV type of construction one hand
must be freeV to release the latch and then -to
AVio open the door. This is 'often very inconvenient
y especially when the party has a lump »of vcoal in
each hand.
With a knowledge of the disadvantages and
defects in the «prior art, I have `as
object of
my invention ythe use Vof a latch which will elimi
nate the element exposed -to the iìre to be eaten
away, the eliminationY of a prominent handle sub
’ ject to impacts and frequent breakage andthe
introduction of a latch which will maintain the
door in tight closed .position at all «times and-in
deference to the wearoi parts whereby eliminat
ing the ingress of air and creation of a draft due
to looseness.
' I have for a further object the use .oi a quickly
and easily actuated latch which requires only
taining' a `door in closed and ever in sealed posi
tion. While >such a llatch might be conveniently
used for'largedoors suchas ice closures, it would
be undesirable for small ones and «especially for
stoves as manual means must ybe provided forí 25
releasing the latchfand heat from -the stove would
destroy the resilient properties vof the spring.
Foot actuated opening means for doors have
been in use.' The patents to Stevenson etal.,
911,175 and Tower 533,571 have been employed ‘30
for large doors to rooms. However, theyghave
no application to small structures such as stoves
since radically ldifferent in structure from those'
necessary to meet the requirements yof -a stove'for>
other device having a small door. Furthermore 35
the heat from ~the stove would destroy the resil
ient properties of the springs. There would *be
no place 4for the foot lever rand no way'of joining
it to the latch for a stove.
Hunt, 1,694,686 discloses means operated bythe 40
foot for releasing the latch but discloses neither ,
a spring pressed latch nor means for 'opening the
door after the latch has been released. Brewer,
720,399, discloses a means operatedl‘by a piston. 45
and valve for opening a 'furnace door.
Although spring actuated «latches and latch re
leasing means have been known, it is my ïbeli'ef
that I have been the first to recognize that it
would be possible and desirable to apply a latch 50
to a stove and to provide auxiliary means for
cooperating with it to produce the above enu~
merated new and unexpected results.
Other objects and advantages of my invention
will appear in the following specification,` and 55
Ythe novel features of the invention will be par
ticularly pointed out in the annexed claims.
Figure 1 shows a perspective of a `circulating
heater, partly in section, employing the pre
ferred embodiment of my invention. Figure 2
shows a plan View of a circulating heater in
corporating the same form of my invention in
it. Figure 3 is an enlargement of the lug show
ing its contour. Figure 4 is a perspective of a
part of a circulating heater, partly in section,
disclosing a modified form of my invention. Fig
ure 5 is a perspective of part of a circulating
heater, partly in section, disclosing a modified
form of my invention. Figure 6 discloses a de
15 tail of my foot operating mechanism, Figure 'l
discloses a plan view of a` modified form of a
door operating means.
In the drawings I designates an inner casing
which forms a combustion chamber about one
extremity of which a ñange 2 extends around
the entire outer surface and serves to space it
from an outer enameled casing.> A door 3 is
secured to the inner casing and is comprised of
two spaced parts, the inner being of the same
v25 material as the inner casing, and the outer coated
with enamel.
From the free end of the inner
ï part of said door extends a lug 4 of such con
figuration that the top surface is flat and the
lower part is formed of oppositely beveled sur
30 faces 2I, 22. To the inner casing is secured a
pivot arm 6 upon one endl of which a roller 5
is mounted. The bracket 'I positions the arm B,
and to the otherrend of the arm is secured a rod
9 through an opening in the transverse portion
8. The other end of said rod passes through a
raising rod 9 compressing spring I I. After this
the roller passes on and rides upwardly on sur
face 2|, spring II moves rod 9 downwardly and
rocks arm ß on its pivot thereby moving roller
5 as far along surface 2I as possible. However,
movement of roller 5 along surface 2l is limited
by the engagement of door 3 with casing I, but
the door is always urged to tight sealed position
against casing I by the action of spring II act
ing through arm 5 and roller 5. Therefore,
ingress of air at the door is always reduced to
a minimum and the effectiveness of the seal is
not destroyed by wear.
The operation of the latch for the ash door is
similar to that employed for the fuel door above
When the hands of the party are not avail
able for opening the fuel door, he may employ 20
the foot to exert pressure upon the pivoted lever
I3 which causes it to rock, and acting through
nut or abutment I2 force lever 9 upwardly and
move arm 6 about its pivot, thus moving roller
5 downwardly out of contact with lug 4 and re 25
moving the latch action. This leaves rod I6 and
spring I'I free to force door 3 to open position,
whereby fuel may be inserted. The foot is re
moved from the lever as soon as the lug 4
clears roller 5 and moves towards open position. 30
The door is again closed in the manner above
Instead of using the door opening means of
Figures 1 and 2, a modified form disclosed in
Figure 7 may be employed. An extending lug 35
housing I0 secured to flange 2, in which housing
I5’ from the hinge may cooperate with rod I6’
is seated compression spring II.
and be actuated by a tension spring I'I’ secured
at one end to the inner wall of the outer casing
and at the other to the free end of rod IB’. In
A nut I2 is
screw threaded to rod 9. The fuel door 3 is
supported by a hinge I5 having an outstand
40 ing portion with an opening therein for the
reception of an end of a rod I6 whose free end
extends through the outer casing for insertion
into a compression spring I'I, and I8 designates
a knob secured to rod I6 for maintaining spring
I1 in normal slightly compressed condition. I9
designates a shoulder on casing I for preventing
door 3 from being raised by the-action of the
Alatch arm 6.
2U represents a knobv or handle on
`door 3 for opening, and 23, 24, 25, 26, 21, 28,
29, 3B, and 3l designate a similar spring actu
ated latch system for the ash door of a circu
f lating heater.
This form of my invention in its operation is
somewhat as follows:
In opening the fuel door by hand, the party
grips knob 2l] and pulls.
This force moves the
door outwardly by causing roller 5 to move over
‘ surface 2| rocking arm 'â downwardly, and rod
9 upwardly by causing spring I I to be compressed
to a greater degree. Upon reaching the end of
' surface 2| and the beginning of surface 22 the
roller` moves faster and kicks the door slightly
for in moving up surface 22 the spring acts on
rod 9 to rock arm 6 and move roller 5 up across
the surface forcing the lug outwardly.
l this no additional force is required to swing the
' door to open position for spring I 'I expands, mov
ing rod I6 through the opening in the outer
casing carrying the outstanding portion I5 in the
. same direction, and swinging the door to open
is forced downwardly as it rides over this sur
face, thus swinging arm 6 on its pivot, and
this form spring I‘i' is always in expanded posi
tion and has a tendency to contract. As it con
tracts the lug I5' is moved and the door swung
In the modification of Figure 4 the roller 5’
moves over the end of lug 4' on oppositely bev-v 45
eled surfaces to lock the door 3’ in closed position.
6’ designates the arm upon which roller 5’ is
mounted and said arm is in turn pivotally mount
ed upon a bracket 'I' secured to casing I’. The
' free end of arm 6’ is secured to rod 9’ whose free 50
end is attached to a tension spring I I’ on the
inner wall of the outer casing. There is no pro
vision made in this embodiment for a foot actu
ated release lever, however, it is recognized that
a number of ways may be employed to release 55
the latch by the foot. The door is opened by
simply gripping the knob 2D’ in the hand and
pulling it which forces the roller 5’ to move back
across the latch surface and release the lug.
If desired a door opening means -of the type dis 60
closed in Figures 1 and 7 may be employed to
swing the door to open position after the latch
has been released.
In the modified form of Figure 5 is is unneces
sary to employ a lug or shoulder on the casing 65
I " to prevent the fuel door 3” from being forced
up out of position by the action of the spring
actuated arm 6". Roller 5", arm 6”, rod 9"
and foot lever I3” act in the same manner as in
the form disclosed in Figure 1. 34" designates 70
' a roller and 35” designates an arm upon which
The door is closed by merely pushing or slam
roller 34" is mounted, and which is rigidly se
ming it. Upon reaching the latch, lug 4 is en
cured to casing I”. The door opening means dis
gaged by roller‘5 von surface 22, and such roller _ closed in Figures 1 and 8 may be employed to
ll and I4 is a nut for securing an end of lever
open the door when the latch has been released.
i3 to rod 9, IU designates a housing or bracket
In its operation a force is exerted on the knob
20” by the hand of the party. This causes the secured to flange 2 for reception of spring II_.
Having thus described my invention, I claim:
lug 4” to be moved forwardand the roller 5" to
l. In a circulating heater an inner casing form
move down along the beveled surface swinging
lever 6" on its pivot and raising rod 9" thus . ing a combustion chamber, an outer casing spaced
compressing the spring Il". Roller 34” moves from said inner casing, registering openings in
across the ñat upper surface of the lug 4". When said inner and outer casings, a door closing said
roller 5" moves to the lowermost position of the openings, said door comprising spaced inner and
lug 4” it encounters the upward beveled surface outer portions for closing said respective open 10
of the lug and under the action of spring It” ings, latch means supported between the inner
and outer casing, and cooperating with said inner
quickly moves across such surface swinging the
door outwardly and permitting the door opening
door portion to normally maintain s-aid door in
means to carry it to open position. The door is
‘tight closed position.
15 closed by pushing or slamming.
When the lug
4" engages rollers 5” and 34”, the roller 5” is
forced down along the lirst beveled surface of
the lug 4" while the roller 34” rides across the
upper flat surface of the lug 4". The roller 5”
20 passes on to the lowermost point on lug l ” and
then up the oppositely beveled surface of the lug.
If there were no roller 34E" the lever 6" acting on
lug 4" would force the door out of position up
wardly and soon render it unñt for closing the
fuel opening in casing l". With such roller act
ing upon the top of the lug this result is impossible,
and after long use little or no wear occurs on the
upper surface of the lug and the door is con
tinually maintained in the correct position. The
30 same type of latching means is also employed for
securing the ash door in closed position.
Figure 6 discloses a detail showing of the foot
lever means for releasing the latch. The foot
lever I3 has a slot in its body portion for the
reception of a lug on the casing which acts as a
pivot. ll is a spring which is compressed by the
upward movement of the rocking lever i3. l2 is
a nut for controlling the compression of spring
2. In a circulating heater, an inner casing
forming a combustion chamber, an outer casing
spaced from said inner casing, registering open
ings in said inner and outer casings, a door clos
ing said openings, said door comprising spaced
inner and outer portions for closing said respec 20
tive openings, latch means supported between the
inner and outer casing and cooperating with said
inner door portion to normally maintain said
door in tight closed position, and means supported
by said stove to release said latch.
3. In -a circulating heater, an inner casing form
ing a combustion chamber, an outer casing spaced
from said inner casing, registering openings in
said inner and outer casings, a door comprising
spaced inner and outer portions for closing said 30
respective openings, latch means supported be
tween the inner and outer casing and cooperating
with said inner door portion to normally main
tain said door in tight closed position, means sup~
ported by said stove to release said latch, and
spring means supported on said outer casing to
bias said door to open position.
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