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Jan. 7, 1947.
-G. J. MAXSON
2,413,987 i
HEAT TREATING 'APPARATUS
Filed Jan. 1o. 1942
'1.6364
316
sa
2 Sheets-Sheet 2
Patented -Jan. 7, 1947 ~ y „
_ 2,413,981
UNITED STATES- PATENT OFFICE
2,412,982
I`
`nnA'r-'rREA'nara APPARATUS '
Gordon J. Maxson, Western Springs. Ill., assigner
to Western Electric ' Company, Incorporated,
NewgYork, N. Y., a corporation of New York
Application January 1o, 1942,'seria1 Nq. 426,362
1s claims'. (c1. 26e-4)
1
2
This invention relates to a heat treating ap
paratus and more particularly to an apparatus
Fig. 3 is a horizontal sectional view taken along
the line 3-3 of Fig. 2 in the direction of the ar
in which parts may be brazed, hardened and
rows showingthe arrangement of heating units
within the heating chamber, and
annealed in a prepared atmosphere.
It is an object of the present invention to pro
- vide a relatively simple heat treating apparatus
in which parts may be brazed or heat treated
and quenched either in a quenching bath or a
Fig. 4 is a horizontal sectional view taken along
the line 4-4 of Fig. 2 in the direction of the ar
rows showing the relative position of the cooling
chamber and charging door, whereby parts may
prepared atmosphere quenching area,
be placed in the apparatus.
"
In accordance with one embodiment of the
invention, ía heat treating furnace lis provided
ence
wherein the heating area is sealed from the out- '
throughoutthe several views, particular refer
-side atmosphere and supplied with a prepared
atmosphere and has positioned directly beneath
Referring to the drawings, wherein like refer
characters
designate- the
same
parts
ence being had to Figs. 1 and 2, wherein a
framework 9, comprised of a plurality oi' angle
15 members, supports the furnace. `Verticaily ex
it a cooled chamber, also sealed from the out
side atmosphere and in communication‘with the
tending angle members III-I0, extending up
furnace, so that gas supplied to the furnace will
wardly from suitable base members II-I I. are
pass through the cooled area.~ The cooled por
disposed ,about a quench tank I2 and carry, at
tion of the apparatus vextends down to a liquid
their upper ends, horizontally extending angle `
quench which is positioned in the bottom portion 20 members I3----I3, on which there are supported
of the cooling vchamber whereby parts may be
a pair of transverse plates I4-I4, which struc
lowered directly from the furnace in which they
ture makes up the supporting framework for the
are heated,- through the cooled chamber, to the
vupper portions of the apparatua» The quench
quenching bath without leaving the controlled
tank I2, which is cylindrical in shape, is provided
atmosphere.
'
‘
25 with an inlet pipe I5 .and an outlet pipe I6, where
In the specific embodiment of the invention dis
by a supply of quenching material Iï may be cir
closed herein, a water :lacketed cooling chamber
culated and supplied to the quench tan-k I2. Se- '
is in` communication with the heating chamber
cured to the upper end of the quench tank I2 is
and a prepared atmosphere, preferably nitrogen,
an annular member I8, which forms an inwardly
is forced into the upper portion of the heating 30 extending flange for the quench tank and on
chamber down through the cooling chamber and
which the circular walls of a cooling chamber I9
' may` be supported.
back to a source of supply or a circulating niï‘ech
anism, which will continuously circulate the pre
The cooling chamber I9 comprises inner and
pared atmosphere through the furnace. The area
- outer walls 20Áand 2|, which define the limits of
in which parts may be cooled is provided with 35 a water Jacket or compartment 22, in which a
a door which effectively seals this area and which
cooling fluid may be circulated. The compart
may be removed to permit parts to be loaded on
ment 22 may be supplied with ‘a cooling iluid
to a lifting platform movable -from the heating
through an inlet pipe 23 and an outlet pipe 2l
chamber to the quenching bath directly beneath
is provided for directing the cooling fluid back
the chamber, whereby parts may be supported in 40 to a circulating system of any suitable type (not
the heating chamber, the cooling chamber, and/or
shown)~
the quenching bath.
A
'
The cooling chamber I3 is provided with a
A better understanding o! the invention may
door 30 hinged to the main portion of the cham
be had by reference to the accompanying draw
ings,
wherein
'
I
y
_
ber I3 by means of hingesu3i and 32. This door
45 30 is hollow and may be connected to the same
Fig. 1 is a plan view of the heat treating ap
cooling system as 4the chamber 22 by inlet and
outlet ports 33 and 34, suitable flexible connec
vention;
.
tions (not shown) being provided for connect
Fig. 2 is a vertical sectional view 4taken substan
ing theinlet and outlet ports 23 and 24 and 33
tially on the line 2--2 ofV Fig. 1 in the `direction 50 and 34 to the coolant circulating system. In
`oi' the arrows, showing the details of construction
order to eiîect an air tight seal between the door
- paratus constituting one embodiment of the in
of the article supporting platform and >its ele
vating mechanism and the relative location of
the heating chamber, cooling chamber and`
,
quenching bath;
30 and the remainder of the cooling chamber
. I9, lock bolts 35 and 36 are pivoted at 31 and
>38 in ñan'ge members 39 and 40, respectively,
65 fixed to the main part of the cooling chamber.
2,418,987
prevent the escape of gas from the housing 9|.
The housing 0I is provided with an inlet port 92,
Threaded on the forward end of the lock bolts
35 and 35 are hand wheels 4| and 42, respec
tively, which may be run down on the threads
of the bolts 35 and 33 to .engage slotted flange
whereby a gas, preferably nitrogen, may be sup
plied to the furnace to maintain a controlled
members 43 and 44, respectively, thus to tightly
clamp the door of the cooling chamber to the
main portion thereof. Positioned in the center
plate 1I and cap member 82 is a thermocouple 94
for controlling the temperature of the heat treat
of the door 30 is a window 45, set into a collar
46 extending through the door 30, whereby parts
in the furnace may be inspected without open
ing the door.
atmosphere therein.
Extending through the
ing chamber defined by the refractory members
15. Articles to be heat treated in the apparatus
10 may be positioned vtherein through the door 30
and may be placed upon a perforated platform
95 having a bail structure 98 connected thereto
and to the platform elevating chain 04. Any gas
admitted to the housing 90 will pass therethrough,
'
The upper end of the cooling chamber I9 is
suitably connected, as by welding, to plates 50
and 5I, which arebent downwardly at their outer
ends to form a flange against which end mem 15 through the aperture 83, through an aperture |00
formed by cooperating walls of notches cut in
_ bers 52 and 53 are fixed. The plates 50 and 5|
ceiving compartment into which doors 55 and 51
the inner ends of the doors 58 and 51 and thence
down into the cooling chamber I9, from which
the gas may pass through an outlet |02 to a suit
screw 62.
ing member 54 by supplying current to the ’motor
and end members 52 and 53 cooperate with an
annular casing member 54 to provide a door re
of heat insulating material may be moved. The 20 able circulating system for preparing a desirable
gaseous atmosphere for use in heat treating parts
doors 55 and 51 are provided at their rear ends
in the furnace.
with threaded members 58 and 59 and have aper
Inthe operation of the apparatus, the doors
tures 50 and 6| formed therein in alignment with ‘
56 and 51 may be retracted into the compartment
the threaded members 58 and 59 for receiving
oppositely threaded portions of a door actuating 25 formed by the members 52 and 53 and the cas
The screw 62 is journalled in a bear- .
61 for rotating the screw 52 in the proper direc
tion. After the doors 55 and 51 have been
, opened, the platform 96 may be lowered to posi
ed on the plate 52 and at the left side of the
apparatus (Fig. 2), the screw member 52 is :lour 30 tion Just below the door 30 and the door may be
removed by manipulating the hand wheels 4| and
nalled in a bearing 65. The screw 62 has mounted
>42 and the lock bolts 35 and 35 to permit the
on its left end a driving Sheave 56, which is
parts to be heat treated to be placed on the plat
adapted to be driven by a motor 51 through a
form, whereupon the platform may be elevated
belt 58 to open or close the doors 56 and 51.
The casing-member 54 has mounted on it a 35 to the position shown in Fig. 2, the door 30 closed
and clamped in place on the cooling chamber I3
tubular shell 10, the upper end of which is closed
and `the apparatus started in operation by sup
by means of a plate 1| resting on a. flange 12
plying current to the heating element 18 and con
formed integrally with the tubular member 10.
ing member 63, at the right side of the appa
ratus (Fig. 2), which bearing member is mount
Surrounding the member 10 and resting upon
the casing member 54 is a tubular body of in
sulating material 13, and within the tubular
member 10 there are placed a series of refractory
members 15, which cooperate to form a cylin
drical heating chamber and which are cut away
along their inner edges, as shown at 11, to receive
trolling the heat generated by these elements
40 through the‘thermocouple 82. When the appa
‘ ratus is started in operation, a prepared gas may
be supplied to the apparatus through the inlet
port 92. This gas may be circulated through the
a heating element 16, which is bent to form an
apparatus, passing first through the aperture 88
into the chamber, deflned'by the refractories 16,
thence to the aperture |00 and to the air quench
irregularly shaped coil extending all the way
around the inside of the chamber defined by the
refractory members 16. At their upper ends,
let port |02. _Suitable systems for generating a gas
constituting a desired controlled atmosphere are
ing area or chamber I9 and out through the out
the refractory members 16 are cut away so that 50 disclosed in the co-pending applications of G. J.
Maxson, Serial No. 426,367, filed January l0, 1942,
several folds of the heating element may be
and A. W. Laird and G. J. Maxson, Serial No.
formed adjacent the upper end of the heating
426,368, flied January 10, 1942. The gas prepared
chamber. Similarly, alternate ones of the mem
in systems such as these may be circulated
bers 16 are cut away, as shown at 80. to receive
several folds of the heating element 18. In this 55 through the apparatus repeatedly, the quenching
bath I1 serving as a seal for the lower end of the
manner, the upper and lower areas of the fur
. apparatus and the upper end of the apparatus
nace heating chamber which are not heavily in
being closed to the outside atmospherelby the
sulated will have a larger amount of heating ele
ment therein than the central area thereof so
that an even temperature may be maintained 60
in the heating chamber defined by the refractory
member 16.
The upper end of the refractories 15 have a
circular cap member 82 positioned thereon to,
prevent any substantial amount of heat from
escaping from the heating chamber. The cap
member 82 has a central aperture 83 formed
therein to permit the passage therethrough of a
platform supporting chain 84, the upper end of
tubular shell 10 and housing 90.
If it is desired to quench the treated articles
or parts in a bath, the bath I1, which may be
continuously circulated through the inlet andl
outlet ports I3 and |5, provides a suitable quench
to which parts may be directed by the platform
96 under actuation by the motor 83 and if it is
desired to quench the articles in the controlled
atmosphere, this may be done in the chamber I8,
which is supplied with a coolant circulated there
through through the ports 23, 24, 33 and 34, it
which passes around a sheave 95 adapted to be 70 simply being necessary to close the doors 55 and
51 after parts have been passed into the cooling
driven through a belt and pulley connection 35
chamber i9 or quench bath I1, whereby thev heat
by a motor 81, transmitting power through speed
of the furnace will be substantially cut off from
reducer 88.- The shaft on which the sheave 85 is
the cooling bath or chamber while the controlled
mounted is positioned in a housing 90, sealed to
the plate 1I and the shaft is properly hushed t0' 75 atmosphere may be circulated through the sys
9,413,987
chamber in communication with the heat treat
tem. ~ 'Thus'. articles to be heat treated may be
either quenched in a controlled atmosphere or
in a quenching bath without coming _in contact
ing chamber, a door in’ said gas quenching cham- - y
to use treating atmospheres -which `heretofore >
ber, a liquid quenching chamber in communica
tion with the gas quenching chamber and sealed
to the .bottom of said gas quenching chamber,
means for receiving parts passed through said
were too expensive for commercial use. With theY
furnace described hereinbefore, the door 30 may
be opened without- contaminating gas in the heat
door for supporting the parts selectively in any
of said chambers, doors interposable betweenthe
heating chamber and gas quenching chamber for
` with the outside atmosphere and the controlled
atmosphere may be conserved, making it possible
ing chamber due to the fact that the .gas in the l0 preventing any substantial amount of heat from
passing from the heating chamber to the gas
upper or‘heating chamber isv heated and lighter
_than the air. This process is further aided' by
feeding the prepared atmosphere in at the top
' of the furnace, eliminating the necessity of purg
- . quenching chamber during the quenching of
parts, compartments sealed from the outside at
' mosphere'and in communication with the cham
ing the heating chamber each time the door is 15 bers of the apparatus for receiving said` doors
when the doors are operîed to permit passage of
opened to load the work on the platform 86.
the article support from the heating chamber
What is claimed is:
`.
Á1. An apparatus for treating `articles compris
to the quenching chamber, and means forjactuat
ing a heat treating chamber, a gas quenching -
ing said doors.
-
6. An apparatus, for treating articles compris
chamber in communication with the heat treat 20
ing a -heat treating chamber, a, gas quenching
ing chamber, a door in saidgas quenching cham
chamber in communication with the heat treat
ber, `a liq'uid quenchingl chamber in communica
ing chamber, a door in said gas quenching cham
tion with the gas quenching'chamber and sealed
ber, a liquid quenching chamber in communica
to the bottom of said gas quenching chamber, and
means for receiving parts passed through said 25 tionwith the >gas quenching chamber and sealed
to the bottoni` of said gas quenching chamber,
door for supporting the parts selectively in any
of said chambers.
means for receiving parts passed through said
2. An apparatus for treating articles compris
door for supporting the parts selectively in any
ing a heat treating chamber, a gas quenching
of said chambers, doors interposable between
the heating chamber and gas quenching cham
ber for preventing any substantial amount of
heat from passing from the he ting chamber to
chamber in communication with the heat treat
ing chamber, a door in said gas quenching cham
ber, a liquid quenching chamber in communica
tion with the gasfqu‘enching chamber and sealed I
to the bottom of sa'id gas quenching chamber,
means for receiving parts passed through said 35
door for supporting the parts selectively in any
the gas quenching chamber dur ng the quenching
of parts, compartments sealed from the outside -
atmosphere and in communication with the
chambers of the apparatus for receiving said
doors when the doors are opened to permit pas
-sage of the article support fromA the heating
-chamber to the quenching chamber, and a pas
3. An apparatusfor treating articles compris
ing a heat treating chamber, a gas quenching 40 sage formed by cooperating portions of said doors
to permit passage of gas from the heating cham
chamber in communication with the heat'treat
ber to the gas quenching chamber.
ing chamber, a door in said gas quenching cham
of said chambers, and means operable to move
said supporting means into any of the chambers.
ber, a liquid quenching chamber in communica
tion with thev gas quenching chamber and sealed
to the bottom of said gas quenching chamber,
' means for receiving parts passed through said
'1. An apparatus for treating articles compris
ing a heat treating chamber, a gas quenching
chamber in communication with the heat treat
ing chamber, a door in said gas; quenching cham
ber, a liquid quenching chamber in communi
door for supporting the parts selectively in any
cation with the gas quenching chamber and
of said chambers, and doors interposable between
s‘ealed to the bottom oi' said gas quenching cham
the heating chamber and gas quenching chamber
for preventing any substantial amount of heat 50g ber, means- for receiving parts passed through
said door for supporting the parts selectively in
from passing from the heating chamber to the
any of said chambers, means operable to move
gas quenching chamber during the quenching of
parts.
_
.
`
.
4. An `apparatus for treating articles compris
said supporting means into any of the chambers,
and a housing in communication with the heat
ing a heat treating chamber, a gas quenching 55 ing chamber for enclosing a portion of thev sup
chamber in rcommunication with the heat treat
ing chamben‘a door in said gas quenching cham
ber, a liquid quenching chamber in communica
port actuating means.
-
.
8. An apparatus for heat treating articles in a
nitrogen atmosphere comprising a vertically dis
posed heating chamber having an inlet port at
tion with the gas quenching chamber and sealed4
to the bottom of said gas quenching chamber, 60 its upper end, a gas quenching chamber sealed to
and disposed directly beneath the heating cham
means for receiving parts passed through> said
ber, a quench tank sealed to and disposed directly
door for supporting the parts selectively in any
beneath the gas quenching chamber, a loading
of said chambers, doors interposable between the
door in said gas quenching chamber, and a gas
heating chamber end_gas quenching chamber for
outlet port in said gas quenching chamber.
.
»preventing any substantial amount of heat from
9. An apparatus for heat treating articles in a
passing from the heating chamber to the gas
nitrogen atmosphere comprising a vertically dis
quenching chamber during the quenchingi of
posed heating chamber having an inlet port at
parts, and compartments sealed from the outside
its upper end, a gas quenching chamber sealed to
atmosphere and in communication with the
and disposed directly beneath the heating cham
chambers of the apparatus for receiving said
ber, a quench tank sealed to and disposed directly
doors when the doors are opened to permit pas
beneath the gas quenching chamber, a loading
sage of the article support from the heating
door in said gas quenching chamber, and a gas
chamber to the quenching chamber.
_
outlet port adjacent the seal between the sas
5. An apparatus for treating articles compris
ing a heat treating chamber, a gas quenching 75_ quenching chamber and quench tank to with
2,413,981
8 ,
4
draw the gas from the bottom of the gas quench
neath said charging chamber, and means for
ing chamber.
transferring work selectively from the charging
'
10. An apparatus for heat treating articles in
chamber to the furnace and from the furnace to
’ a nitrogen atmosphere comprising- a vertically
the bath, said furnace, charging chamber and
disposed heating chamber having an inlet port CA bath being in direct communication and sealed re
at its upper end, a gas quenching chamber sealed
to and disposed directly beneath the heating ,
chamber, a loading door in said gas quenching
chamber, and a gas outlet port -in said gas quench
ing chamber.
'
lation one to another.
.
16. A heat treating apparatus comprising a bot
tom loading furnace. a charging chamber posi
tioned in direct vertical alignment beneath the
10 furnace, a quenching bath positioned in direct
11. A treating apparatus comprising in vertical
vertical alignment with the charging chamber,
alignment, a bottom loading furnace, a charging '
said furnace chamber and bath being in sealed
communication one 'with the other, transfer
means for transferring articles to be treated from
one to another chamber and bath, and means for
introducing treating gas into the furnace and di
recting it through the furnacefto the charging
chamberhaving closure means for the admission
of work to be treated, and a quenching bath, and
means for transferring work from said charging
chamber into the furnace and after heat treat
ment', into said quenching bath.
`
12. A heat treating apparatus comprising a bot
chamber.
»
17. A heat treating apparatus comprising a
tom loading furnace, a charging chamber posi
tioned beneath said furnace, a quenching bath l20 bottom loading furnace, a charging chamber pc
positioned beneath said charging chamber, said
sitioned in direct vertical alignment beneath the
furnace, a quenching bath positioned in direct
furnace, chamber and bath being in vertical
vertical alignment beneath the charging cham
alignment, and transfer means for moving arti
cles from the furnace through the charging
ber, said furnace chamber and bath being in
chamber to the quenching bath.
'
25 sealed communication one with the other, trans
fer means for transferring articles to be treated
13. A _heat treating apparatus comprising a
from one to another of the chamber, furnace and
bottom loading furnace, a charging chamber po
bath, means for introducing treating gas to the
sitioned beneath said furnace, a quenching b_ath
upper end of said furnace, and an outlet adjacent
positioned beneath said charging chamber, and
transfer means selectively operable to position ar 30 the bottom of the charging chamber, whereby gas
may be forced through the furnace and charging
' ticles in the furnace, chamber or bath.
chamber to purge the charging chamber of air
14. A heat treating apparatus comprising a bot
admitted during the loading of the furnace.
‘
tom loading furnace, a charging chamber posi
18. An apparatus for treating articles com
tioned beneath said furnace, a closure means in
prising a heat treating chamber, a charging
said charging chamber for the admission of work
chamber in communication with the heat treat
to be treated, a quenching bath positioned be- _
ing chamber, a door in said charging chamber,
neath said charging chamber, and means for
a liquid quenching chamber in communication
' transferring work selectively from the charging
with the charging chamber and sealed to the bot
chamber to the furnace and from the furnace to
tom of the charging chamber, and means for re
the bath.
ceiving parts passed through the door for sup
15. A heat treating apparatus comprising a
porting articles selectively in any of the
bottom loading furnace, a charging chamber po
chambers.
’
sitioned beneath said furnace, acharging door in
GORDON J. MAXSON.
said charging chamber for the admission of work
to be treated, a quenching bath positioned be 45
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