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Патент USA US2407230

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Sept 10,1946-
Filed Oét. 27, 1941
.6‘ Sheets-Sheet l
%“A”? 4%
561*- 10, 1946-
Filed 001:. 27, 1941 '
6 Sheets-Sheét 2
5GP!- 10, 1945.v
$407,230 v
sell 10, 1945-
Filed 051;. ‘27, ‘1941
s Sheets-Sheet 4
Sept. 10;1'946.‘
Filed 001;. 27, 1941
6 Shgets-Sheet 5
S¢Pt~ 10, 1946'
‘Filed Oct, 27, 1941
a Sheets-Sheet e
Patented Sept. 10, 1946
Ernst Albert Furkert, Chicagmllll
Application October‘ 27, 1941i Serial? Nd. 416§6l§~
3‘ Claims. (Cl. 265-4)
This "invention: relates to improvements
forming e part‘ or the supporting frame structure
of the machine and iiidieated greneieily by the‘
numeral f4‘. Mo‘u'iiteci on the shaft II, which is
one objeet at the invention is to‘ provide ime
pteved heat treating eppeieitus adapted for use
tubular; is‘ a pulley‘ I15 driven by a- belt 16 which
in» heat treeting metal ettieles with desired uni
7 is epereble by a meter it which may be attached
fotni-ity during-hardening onetetions.
to" the" supporting‘ frame‘ structure oi the ma
chine.“ A geseeus fuel is supplied to the tu'bi?er
retery heating enper‘attis forv ?niteimy heating
sheiit II by‘ means of any appropriate pipe eIe
to‘ the teqiiired temperature-s stationery metal er
ment such the ss'tetieneiry pipe l8 having‘ a gas;
10' tight coupling‘ I‘B’a
ti'ei'es wee hardened»;
connects the same to the‘
Ah add-itie‘n-al ole-jeet of the‘ invention is to pro
upper end: at sne'tt H, and other elements coni
vide improved ‘means for: immersing heated er»
stitu'tingf a" gas line by meansof which the gas
e,‘ siiiteble bath‘ automatically‘ when» the
from‘ a; suitable‘ s‘oufee‘ is c'tiiidiiét‘e‘d to the 1101*
esiti'eles'i have been: heated te a- predetermined
low shaft;- The present improvements‘ are dete?i-pe‘f'etn e;
15 signed for utilizing either natural? or‘ erti?eiei
Aidditi‘c‘in‘eli ot'ieets of" the“ invention» relate to
illuminating gas suitably mixed with air e mix
vetti’oi'ls‘ffeartilfes-of eonsttuetien and arrangement
inje“ apparatus, net shewn in the drawings, from
enable the improvements to be
which it is eenduetedi as-bif the'li?ipé r9 to a motor
utiiiizettedveiitegeeusIy iniheeting articles of dif
veive 2e;- te a; tire
21', and thence to the
fie-rent dime sions and sizes, iii pesitieni'ng the 20: pipe r8 referred to above; When the machine
ertieies' ate ate-1y predetermined heating po
is in: oi?eiation; the‘ motor~ verve 2|] will‘ be open
Another‘ object of the invention is to provide
siti'é‘ri, end moving-‘the heéte‘d elrti‘eles‘ expedi
tieiisiy'to the ce-eIi-n‘g teeth; as‘ wen sis meving the
to admit the fuel tn the heating apparatus‘, but‘
when the-meter valve cre's'ed‘ by‘ a switch he'ree
immersed‘ artistes within the bath, eii or which
ineft‘e'r' referred to‘; a reduced quantity of gas is
objeets etiiciothets will be apparent from a con 25 by‘eeessed amend the ifeiv‘e thr‘ou'gh pipes‘ 21, 22
sideretion‘ of! the accompanying“ drawings, where
and‘ 23 to maintain- a' flame at1 the burners here‘
inefter described‘.
Figure 11 is‘? a Side elevation of‘ apparatus em
lower‘ end of the shaft H is provided with
heating‘ the” present ‘iniprevemehts ;-i
‘ a;- piiifeiityl of branches 24‘, four Being‘ shown in
Fig: 2, is‘ e- t'op 1:31am view ‘of the apparatus 301 Fig". 2, which‘ trenches Communicate with an
shetvii-iri Fig; 1;;
annular‘ nienifeld 25 which constitlites‘ e part of
the reterystruetnre ef the nietehi‘zie. From the‘
Fig‘. 3 is e seeti‘dheti view teken'on line 31+’:
of Fig. 1;
manifold: the gas ?o'ws- into a. slurality o'f burners’
Fig‘. 4 is an‘ enlarged seeti‘eiiai View taken (in
‘ or‘ tern-hes indiéated' genera‘?y by‘the numeral {6.
line 41'—'4/OfF'ig£ 3;:
‘ Thevterehes‘ which? are directed radially inwardly’
5‘ is" e treitei-iseetienel‘ view taken on line
of'the' rete-ry structure are provided with nezzies
5A5 e'i Fig. 1;;
Fig; 6_ is an emerged sectienelf View" taken’. on
line‘ GAGFdfFig'. 5:
21 at their inner ends which eoiii-mu'mcate with
?eX-iBle tubes 28. The tubes 2a‘ in turn commu
nicet‘e with the manifolds by‘ means‘ of suitable‘
Fig. 7 is an enlarged sectional View taken‘ on‘ 403 pine connections as shown in Fig. 11 comprising
line T-‘I- ofF‘igi. 5;
elbow 29; regulating tel-ire 30 and conduit Sections"
31. It will thus be seen‘ that gas from the inani=
iol'd- ‘may new to‘ the burner nozzles while the
Fig‘. 8v is- e s‘e'etio‘neti View‘ taken on Tine 8GB
Fig; 9' is a seeti‘en taken
line e-es ef'ii'ig‘. .8‘;
Fig; 10? is
eii-ier'ge'd ten'pien" View‘ of one of‘
tii‘etiitiiers- e'r toi‘e‘he‘s' which supply heat to" the
e‘ritieieite be heated:
Fig"; 1-11 is’ an‘ enlarged seetienei View‘ taken on‘
line I [at]? efiFi‘g.
is an eIevet-ien, partia?‘y diagrammatic,
In ‘ ' i-l-liistii'etive embodiment of the invention
in the dr'e'tv'vih‘g's', ‘rater heet appiying’
fii‘oir'ided which is in‘dieet'ed‘ gene
eiféill'g'r by‘ t?en?inei‘tt-T Hi. The‘ mechanism coin
prises a tetei'y veeti‘cei' shaft H which is suitably
journeied beatings: [2", we
éii-"é supported
by transverse‘ frame
153-, W" (see Fig; 2?)?
manifold end burners are reteting.
Each of the‘: nozzles‘, as shown in Fig. 10, ate
teched te- a horizontal red or arm; 32 by means"
of a, suitable clamp 33. The rod 32 is afd‘justably
secured to a bracket" 34 which is secured to and
depends item the menitoid‘ 215, in the form of‘
the nozzie support shown in Figs; 10 and 11.
Each of‘ the rods 32 is‘ carried between a pair of
cooperating ci‘eimn pi‘at‘es' 35 and 36 which are aid-v
iust'ehiy secured together by means of screws 31.
Upon loosening" the screws 31, the rod can be slid
forwardly" of ree-rwerdl'y or turned’ angulerly
abent' the" axis of the rod and’ reclamped in the
desired pesitien
31 are’ shown
by tightening
as provided
the screws‘.
with slotsn38
tl'iroliigfh catch‘ of which“ projects a tightening
sei'ew' 39*.foi‘ securing the‘niet‘es 35 and 36'1i'n ver
4 .
tically adjusted position to the bracket 34.
Hence, the nozzles can be adjusted arcuately
about the aXis of the respective rods 32; they can
be moved inwardly or outwardly by the sliding
movement of the rod mentioned above, and they
can be moved vertically by sliding the clamp
plates 34 and 35 along the brackets 34; the ?ex
ible ducts 28 permitting such adjustments.
As illustrated in the drawings, the nozzles are
directed radially inwardly of the rotary structure 10
for directing ?ames upon an article to be heated
which is located in a position disposedalong the 1
horizontal position shown in full lines in Fig. 8,
and is supported in that horizontal position by
legs 54 which contact the bottom portion of the
tank. The bars 52 are located su?iciently close
together to arrest the downward descent of a gear
as the latter is lowered by the piston and thus
remove it from the gear support member 43.
Such a removed gear is indicated at 44b in Fig. 8.
Suitable means are provided for tilting the gear
receiving member 5| to cause the same to slide
therefrom onto an inclined rack 55 also located
in the tank, as shown in Fig. 8. Such tilting
means may be in the form of a structure compris-l
ing a pair of bell-crank levers 56 each having a
the improvements herein disclosed are adapted"
for heat treating articles of various shapes, they 15 short arm located adjacent the shaft 40 for en
axis of rotation of the rotary‘structure. While
gagement by the gear supporting member 43 as
the latter moves downwardly through the?mem
ber 5| to the dotted line position shown in Fig. 8.
will, for illustrative purposes, be described in con
junction withthe treatment of gears.
‘ For the purpose of supporting a gear in a heat
ing position, as illustrated in Fig. 9 for example,
As the member 43 engages the ends of the short
suitable reciprocating mechanismhas
vided. Such 'mechanism comprises a vertical
20 arms of the levers 56, the longer arms thereof
are moved clockwise to the dotted line position
shown in Fig. 8, and in so moving, engage a pair
of bars 52 of member 5| and tilt the latter to the
dotted line position shown in Fig. 8 and thus cause
an arrested gear in the position indicated at 44b
to slide from the member 5| onto and downwardly
along the inclined rack 55 to the lower upturned
portion 55a thereof vwhere it is arrested and re
mains until removed from the bath. As indicated
30 by the positions 440 and 44d of the gear, it will
In the embodiment of the invention illustrated,
thus be seen that when a gear has been heated
shaft 40 which, at its lower end, is secured to a
piston 4| arranged to operate in a cylinder 42.
The upper end, of the shaft 40 is provided with a
removable gear, supporting member 43 of a size 25
to enter the axial opening 44a of a gear 44 to be‘
treated as shown in Fig. 9. Where gears having
different size openings are to be treated, appro
priate supporting members 43 ?tting such open
ings are employed.
to the proper temperature, operation of the valve
4‘! will admit air under pressure through conduit
45 to the cylinder 42 above the piston, and the.
gear will be moved quickly into the bath and will
be freed from the gear carrying member 43 by,
the cylinder. A suitable valve 41 is provided
reason of the descent of the latter to a position
whereby air delivered thereto by a conduit 48
beneath the gear receiving member 5|, where
may be directed to‘ the conduit 45 for elevating
upon, due to the tilting action of the member 5|,
the piston, the rod 4|! and a gear thereon, or the
air may be directed through conduit 46 for 10W? 40 the gear will be moved by gravity laterally or to
the right, as shown in Fig. 8, to the lowermost
ering the piston, the rod 40 and the gear thereon.
portion of the rack 55. Hence a hot gear, by
The valve may be of any suitable type and is
reason of its movement within the bath, is cooled
shown as being provided with a manually oper
quickly since it does not remain in its original
able handle 49 for controlling the operation of the
piston, although as described hereinafter addi 45 arrested position in the cooling liquid and comes
to rest within the liquid adjacentan end of the
tional means preferably are provided for operat
tank from which it can be removed by an at
ing the valve in controlling the descent of the
piston. The cylinder 42, as shown in Figs. 8 and
Air under pressure may be supplied to conduit
9, is located beneath an end portion of a tank 50
which is vsupplied with oil or other appropriate 50 48 from any suitable source, but in the drawings
the piston 4| is designed to be operated by com
pressed air, and for this purpose, a conduit 45 is
shown extending to the bottom of the cylinder 42,
whileva conduit 46 extends to the upper end of
cooling liquid into which a heated gear is im
mersed for hardening the same.
the duct 48 is shown as being connected to air
pressure tank 56 having mounted thereon an air
,The shaft 40 extends upwardly'through a suit-_
ably packed opening in the tank 50 and through
pump 51 operable by a motor 58 which main
tains the desired pressure in the tank for the pur
the liquid, as shown in Figs. 8 and 9, and projects 55 poses mentioned.
To facilitate the positioning of gears to be
at its upper end substantially into the horizontal
treated upon the gear carrying member 43, as for
plane of the nozzles 21 for supporting a gear 44
example, where a number of similar gears are to
in heating position when the piston is in the up
be hardened, a suitable gear loading member is
permost position, as illustrated in the above-men
tioned ?gures. Upon descent of the piston to its 60 provided which in the form illustrated comprises
a lever 60 pivotally supported on a vertical shaft
lowermost position, a gear 44 carried by the shaft
6|, which in turn may be journaled in a bearing
4|! -is drawn downwardly into the cooling bath.
62 and provided with anti-friction bearings as
When the piston has been retracted to its lower
shown in Fig. 6. The lever 60 is provided with a
most position, the gear supporting member 43 is
manually operable handle 64 whereby the lever
disposed in the dotted line position shown in
may be swung from the full-line position shown
Fig, 8. The shaft 40 extends through a gear re
in Fig. 5 to the dotted line position and vice versa.
ceiving member which is positioned within the
The forward end of the lever 60 is provided with
tank 59. Such a receiving member is indicated
a gear supporting head 65 having a recess 65*? of
generally by the numeral 5|, and in the form il
sufficient size to permit passage therethrough of
lustrated is of grid-like formation constructed of
gear carrier members 43. The recess, it will be
bars 52. The member 5| is pivotally supported
noted. is open at one side whereby when a gear
adjacent the forward portion thereof on a rock
positioned on the head has been swung clock; '
shaft or the like 53 whereby it can be tilted clock
wise to a position over a cylinder 42, and has
wise to the dotted line position shown invFig. 8.
Normally, the gear receiving member 5| is in the 75 been removed therefrom by the_,upward move
ment of the gear; carrier 43, the lever 60 can be
returned from the dotted line gear delivering, po- '
sition shownin Fig. 5 to thefullline or gear load
ing position thereof.
Two arms, 66‘ and 61, project radially from the
head 65= over the upper surfacev of an arcuate
track 68- which’ is concentric with reference to the
pivotal axis H of the lever 60. The forward ends
of the members 66 and 61‘- preferably are provided
with anti-triction members 69- which contact the
upper surface of the track 69 for reducing fric~
tion. during the‘swinging movements of the lever
60. Such an‘ anti-friction. member is illustrated
iii-Fig‘ '2 0t thedrawings.
wardly by the‘ piston into engagement with the
gear, as shown in. Fig. 9,, for elevating the same
into the heat zone of the apparatus; When the
locating bars or stops '10 have once been prop
erly positioned for handling gears of. a given, di
ameter,‘ such subsequent gears‘ when placed on
the head 68 will be properly located‘for registra
tion with the member 43 when the lever 60 is
in the dotted line position of Fig. 5.
In Figs 2 and 3 of the drawings a horizontally
disposed tank ‘[6 is shown provided with a tubuh
lar: coil ‘H therein which is connected to a Source
of“ cold water such as the city water supply for
circulating Water therethrough‘ for‘ reducing the
The head 65 and the adjacent‘ portions or the 115, temperature of the oil employed in the quenching
supporting arms 66 and 61- areprovided' with ad
tank of the apparatus. A pump 18, operable by a justable gear centering members ‘H1 in the form‘
motor-‘19;. draws the oil from the tankv 50 and
of slotted barswhich may be secured in property‘
forces the same through the tank 16‘ ‘where it is
adjusted positions by screws H. The inner ends
cooledby the coil. and from which it. is. returned‘
of the bars 10 can be adjusted about a central
point whereby when a gear, such as the gear in
dicated by the numeral» 44" in Fig. 5; is in the
position; illustrated and, the. lever 60 is'swung
to the. dotted lineposition of said» ?gure, the gear
will be engaged by the gear supporting member
43‘ when the piston 4| is moved: upwardly as above
described“ When gears‘ of larger or smaller di~i
ameter than the gears shown in. Fig. 5 are to be
treated; the gear locating- bars- ‘Ill are adjusted»
outwardly or inwardly proper radial distances
Itiwill-i, therefore, be seen that the- distance from
the axis Eli ot the lever 60» to the center of gear
44' is the same as the distance from the axis’ 6|v
to the. vertical center line? of, the gear supporting
member 43'.
to the: quenching tank 50,
In Fig. 1 .of the drawings a switch panet 80-isi
shown‘ secured to the‘ front» of themachine and ‘is:
provided with a switch; ill‘ for controlling the ope
oration oi the‘. pump 19' whereby the? oil in the‘
tank 50may be‘mai'ntained at a» proper‘ quench:
ing temperature A second switch‘ 82 is‘ shown
for controlling the operation of the motor“ valve
20. Aiswitch 83 also mounted on the panel cone
trols the operation of the motor 11. The three
\ switches" referred to ‘particularly- are illustrated
as of the toggle or'snap on and off type; When
the switch 83 is closed the motor [1 operates con;
timmusly until; the switch is turned- to the oil"
position A second switch‘ for‘ controlling the
motor‘ I1: is. provided which‘ is. a, ‘spring-opening
Suitable means are provided for assuring a
switch; indicated by the numeral 84.‘ When the
proper adjustment of the-bars‘ 10 with reference
button of this switch is’ pressed inwardly, the
to a vertical axis which will coincide‘wi-th the-axis
motor circuit is closed, but when the button is
of the member 43- when- the lever 601 has" been
released, the switch is automatically opened.
swung to the gear delivering position shown in 40 This switch is of convenience in making adjust‘
dotted lines, in: Fig‘ 5», In- the present embodi
ments of‘ the torches or burner nozzles since by‘
ment ofv the invention such means
shown; as
its ‘use the rotary structure can be caused’ to
comprising a bracket or arm 'IZextending hori
zontally from a supporting arm 13 which sup-i
ports the bearing, of shaft BI and provided at its
outer end with means: for. sl-idably supporting a
centering pin- 141 (see Figs. 1, 4» and 9):. Means;
for slidably supporting‘the pin 14 may comprise
a; tubularsupport 15' into which- a reduced lower
end‘ ‘Me- of a. pin can- be- inserted‘. Onthe‘upper‘
end of the pin 14 in Fig; 4" is‘ shown‘. amember
move a few‘ degrees of are at‘ a time‘ for moving
nozzles-- into a. position at the front of the ma‘
' chine.
The machine itself can be located with
its rear against-or close to a» wall, or in a cor-i‘
nor of a: room since it is not necessary for an
operator‘ to work: on all sides of the machine in
effecting'adiiustmentsz of thevv burners; An addih
‘ tional: switch 85 is shown on: the panel! 811 for-con
trolling: the“ operation of the air compressor mo
tor‘ 58: This switch may be: of either type above
referred to, but is shown as‘ being of'a type" simi—
The‘, vertical axis of the member 15 is spaced
lar tov the switch‘ 84.
from the axis’ 6| a distancecorresponding‘ to‘ the:
Also positioned on the panel’ i2‘ is: a tempera‘
distance from- the axis 6|" to the axis: of the gear‘
‘cure:v indicator’ designated generally by the‘ nu;
holder‘ 43-. By sliding‘ the;
14‘ upwardly by
m'erall sea. The indicator‘ is of the controlling‘
means, or the lower: projecting endi14'“ thereof‘to
pyrometer type: of known. construction‘. The in
the dotted‘ line.v position shown inFig. ‘t, the-mem
dicator comprises a. thermocouple 81 adapted to“
ber 14b'will project into the area» of the" slot 659“ (it) be‘ positioned! against- a gear: in the heating‘ posh
of the‘ arm 60? when the latter‘ is in the loading
tion'; as illustratedin Fig.‘ 12; Conductors" Mex
or full line position shown: inFi'g'._ 5-, A setescrew‘
tend from: the coupi'e‘t'o the instrument‘for effect‘
'l4eis shown for:temporarilyretaining the pin, 14‘
irrg actuation. oii a‘ hand or pointer 89 which in“
in: the elevated‘ position.“ The gear‘ or one of‘ a‘
dicaltes: the changing temperature of the gears‘
14b,“ corresponding in. diameter: to the gear open
ing and similar to‘ the‘ supporting member 43'.
group of similar‘ gears: to be treated can then be
placed upon, the: member ‘Mb? for’ the purpose oi‘
locating the same in the proper position; the bars
10 being‘ thereupon adjusted: into‘ contact with
the exterior‘ of‘ the; gear for retaining it- in such
position, The pin ‘lo-4. and‘ member 1411‘ can then
be lowered to a non~ohstructingfposition beneath‘
the arm: 6i? orca-n" be removed from the member
15. When the lever 60 is swung to the dotted line
position, the center opening of the gear will regis
ter with the member 43 as the latter is ‘moved up
during the" heating‘ operation.- A temperature
selector hand 901 can be adjusted to a position;
corresponding to the maximum temperature at"
whicha gear: or: gears, are‘ to be‘ heated; when
the gearin the heating zone
at‘ the selected
~ temperature,‘ as indicated by the hand 89; it will
beparaliel with the hand so; In- the present-em»
bodimeni; oi the? invention; the" conductors‘ 88 of
the‘ couple to extend downwardly from the in;
dicator B6 on the exterior of the rotary struc
ture, and the couple is held against the gear pe
riph'ery in such a position as not to interfere
with the rotation of the burners, nor with the
lowering of the gear when the proper tempera
ture has been reached. Any suitable means such
as an adjustable arm 9| pivotally mounted on a
bracket 92 may be employed for retaining the
couple in contact with the gear during the heat
ing Operation. A spring 93 is shown for pressing
the couple ?rmly in contact with the gear. An
adjustable stop 94 limits the counterclockwise
movement of the couple when the gear has been
moved into the quenching ?uid. When the next
gear is moved into the heating zone, it will move
the couple and arm 8| into the position ShOWn in
Fig- 12.
The indicator 89 constitutes means for effect
ing the automatic operation of the valve handle
49 in a direction to lower the gear-into the
quenching ?uid. When the hand 89 moves into
a position parallel with the adjustable tempera
ture selector hand 99, the mechanism of the DV
rometer, by known means not disclosed in the
drawings, is arranged to close a circuit switch.
In this instance the circuit includes conductors
95 and a solenoid 96. The solenoid is operatively
connected to the valve handle 49 and hence moves
the same to admit air into conduit 49 and there
by lower the gear into the quenching liquid.
Since an article while being heated in the im
proved apparatus remains stationary, it need not
be ?rmly attached or clamped to supporting
means as in prior apparatus where the articles
bers 19 to center the gears with respect to the
path of movement of the gear supporting mem
ber 43, when the loading lever 69 has been swung
to the dotted line position of Fig. 5, facilitates
the handling of the gears since, during the period
that one gear is being heated, the attendant can
place another gear in position on the member 65
and can swing that gear inwardly into alignment
with the path of member 43 immediately fol
10 lowing the quenching of the heated gear.
positioning of the gears in heating position by
the means described, as well as the adjustment
of the burners, can be effected without an attend
ant being required to reach into the'heating or
15' ?ame zone of“ the machine as will be seen.
While I have shown and described certain em-,_‘
bodiments of my improvements for the purpose
of illustration, it is obvious that various alterai
tions may be made vtherein without departing
20 from the spirit of the invention.
I claim‘:
1. Heat treating apparatus comprising a, plu
rality of rotaiy burners arranged in positions for
projecting ?ames into a zone located axially with
25 respect to the orbit of the burners, means for ro-,
tating the burners, means for supplying fuel
th‘ereto during such rotation, vertically recipro
cable means for supporting in said zone an arti-I
cle to be heated, means for reciprocating said sup
porting means between upper and lower posi
tions, and article transferring means operable
from a position remote from said supporting
are rotated and the heat sources are stationary.
means for receiving an article to be heated and
The article, heated by means of the present im
provements, can, therefore, upon acquiring the
transferring the same into the path of movement
of said supporting means intermediate said upper
desired maximum temperature, immediately be
and lower positions thereof for delivery thereto
immersed in the quenching ?uid without addi
tional handling.
upon movement of said supporting means from
the lower to the upper position.
2'. Heat treating apparatus comprising a plu
shown connected to the conduit 2| forming part 40 rality of horizontally rotatable burners arranged
to project ?ames upon an article located in a zone
of the by-pass around the motor valve 20. The
disposed centrally of the orbit of the burners,
?ame issuing from the upper end of the pilot
means for rotating the burners, a reciprocable
member by its color gives an indication of the
support for engaging an article and elevating the ‘
character of the admixture of the gas and air be
ing delivered by the gas mixing machine not 45 same into said zone, means for actuating said
In Fig. l of the drawings a gas pilot 9? is
To a gas port in the lower end of the
pilot 91, a ?exible tube 98 may be attached, the
tube having a burner tip 99 at its outer end. By
opening a pet-cock I99, gas will be delivered to
the burner tip 99 which may be ignited by the
flame issuing from the upper end of the pilot
91 and the tip used as a torch for igniting the
support from a lower position to a position for
supporting an article in said zone, and means for
delivering an article into the path of movement
of said reciprocable support at a level above said
lower position for engagement and elevation
thereof to said upper position.
3. Heat treating apparatus comprising a, verti
cally reciprocable shaft provided with‘ an article
supporting member on the upper end thereof,
burners of the rotary structure.
By means of the present improvements it has
means for directing heat upon an article on said
been found that articles can be heat treated sat
support when said shaft is in an elevated‘ posi
isfactorily and expeditiously by utilizing manu
tion, a horizontal swingable member provided
factured or natural gaseous fuels of relatively low
with article holding means spaced from the piv
?ame temperatures and with less likelihood of
otal axis thereof a distance corresponding to the
overheating or burning the articles than where
more expensive and high ?ame temperature fuel 60 distance from said axis to the path of movement
of said shaft, said swingable member being lo
is employed, such as oxyacetylene gas which gen
cated at an elevation lower than the uppermost
erally has been used in prior ?ame hardening ap
position of said article supporting member and
paratuses. A sufficient number of the burner or
being swingable to a position for locating an
torch nozzles 21 can be adjusted to direct ?ames
upon these surfaces of the article that are to be 65 article carried thereby coaxially above said arti
cle supporting member when the latter is in a
hardened to heat the same to the desired tem
lowered position, and means for moving said
perature, such burners as are not required in
shaft and supporting member upwardly into en
heating a relatively small article, for example,
gagement with an article in said coaxial'position
being moved radially outward to inoperative posi
elevating the latter into heating relation with
tions, such as the positions of the burners in 70
respect to said heating means.
dicated by reference characters 2'!a in Fig. 3. It
will also be seen that where several identical gears
are to be hardened, the adjustment of the mem
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