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Патент USA US2411698

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Nov. 26,- 1946.
H. E, SOMES
‘2,411,698 ‘
INDUCTION HEAT TREATING APPARATUS
Filed May 10, 1941
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INVENTOR
Howard BvSomes '
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ATTORNEY
Nov. 26, 1946.
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H‘. E. soMEs
2,411,698
INDUCTION HEAT TREATING APPARATUS
Filed May 10,‘ 1941
_'1o Sheetsv-Sheet 2
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INVENTOR
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Howard E-Somes
ATTORNEY
Nov. 26, 1946.
2,411,698
H. E. SOMES
INDUCTION HEAT TREATTNG APPARATUS
Filed May 10, 1941 '
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INVENTOR
Howard E. Somes
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ATTORNEY
Nov. 26, 1946.
2,411,698 v
H. E.- SOMES
INDUCTION HEAT TREATING APPARATUS
Filed May 10, 1941
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IN VENTOR
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ATTORNEY
Nov. 26, 1946.
H. E. SOMES'
2,411,698
INDUCTION HEAT TREATING APPARATUS
Filed May 10, 1941
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Nov. 26, 1946.
2,411,698.
H. E.YSOMES
INDUCTION HEAT TREATING APPARATUS
Filed May .10, 1941_
I
10 Sheets-Sheet 9_
196
INVENTOR
'
'
HawardBSomes
BYj'
ATTORNEY '
-
Patented Nov. 26,
2,411,698"
'v UNITED" STATES - PATENT‘ 'oFncE- 2,411,698
INDUCTION HEAT-TREATING APPARATUS
Howard E. Somes, Detroit, Mich" assig'nor, by. -‘
mesne assignments, to _The Budd Company,
Philadelphia, Pa., a corporation of Pennsyl
vania
_ I Application May 10, 1941, Serial No. 392,867
10 Claims. (Cl. 266-4)
1
2_.
.
I
1'
ing'in section to better illustrate certain details
This invention relates to heatv treating vappa
ratus and more particularly to heat treating ap
there'of ;
Figure 4 is a transverse section taken substan-. ' v
tially on line 4-4 of Figure 3;
-
' paratus adapted to heat treattthe internal sur
face of tubular or cylindrical members.
Figure 5 is a sectional vlew'taken on line 5-—5
i The apparatus is especially adapted to hold a
of Figure 4;
cylindrical hollow member and rotate the same
while at the same time progressively move the
Figure 6 is a transverse section taken sub
hollow member relative to a heating head and a
quench head to heat treat the same from one
4 stantially onllne 6-6 of Figure 3;
.
I
Figure 7 is an enlarged vertical section take
end to the other. The apparatus is adapted to 10, through the switching transformer to show the
general arrangement of the parts thereof;
accurately hold the hollow member in place dur
Figure 8 is a horizontal section taken in the
ing the heat treating operation and to move the
region of the upper'cross head of the work car
same longitudinally relative to the heating and
quench heads at an accurately controlled rate
riag‘e to show the capacitors and, the arrange- _ '
of speed and to perform the operations rapidly,. 15 ment for conducting cooling ?uid to the heat‘
automatically and safely. The invention consti
head arbor;
tutes an improvement over the app'aratus dis- 1
closed in Patent No. 2,281,297 and Patent No. -
Figure 9 is a section taken substantially on 1
line 9-9 of Figure 8 ; ‘
‘ Figure 10 is. a vertical section taken substan
2,281,331, both dated April 28,. 1942.
'
An object of the invention is to provide heat 20' tially on line Ill-l0 of Figure 3 to show the
structural details of the heat and quench heads;
treating apparatus having automatic control over
Figure 11 is an enlarged view in elevation of 1
' the operation and relative movement of the vari
ous parts and in which time control is coordi- .
a portion of the right side of the apparatus i1
lustrated in Figure 3;
nated with the relative movement of these-parts.
'
Figure 12 is a side elevation of a control feature
Another object is to ,provide' automatic con 25
of the apparatus, the parts being associated with
trol for apparatus of the type set forth in which
the part of the apparatus illustrated in the upper
a high degree of safety against possible damage
portion of Figure 3 but removed therefrom as a
and trouble is assured. Another object 'is to provide'in an induction ' result of the section therein illustrated but ap
heat treating apparatus means whereby ‘opera
30
heat treatment.
,
pearing in Figure 1;
Figure 13 is an operation diagram illustrating
the sequential operation of the sequence con».
tion of the same cannot proceed until the work
piece to be heat treated is in proper position for
‘ troller operated switches;
-
Figure 14 is a diagrammatic illustration of the
Another object is to provide in an induction
heat treating apparatusvhaving a ?uid cooled 35 hydraulic control system employed in conjunc;
inductor, means whereby electric current can
tion with the apparatus;
I
V
mined ?ow of cooling fluid through the inductor
Figure 15 is a diagrammatic illustration of the
cooling and quenching apparatus and of the ?uid
is established.
pressure controls, therefor; and
. not be-delivered to the inductor until a predeter
-
The above and other novel features of the 40 vFigure 16 illustrates a wiring diagram through
which automatic operation of the apparatus is
invention will appear more fully hereinafter
from the following detailed description ‘when
achieved.
-
-
‘Referring-to the drawings, in which like nu
merals refer to like parts throughout the several
taken in conjunction with the accompanying
' drawings. It is to be expressly understood, how-'
ever, that the drawings are employed for pur 45 views, particularly Figure 1, there'is generally
illustrated a heat treating apparatus including a
poses of illustration only and are not designed
rigid upright frame 40 of hollow box section
as a de?nition of the limits of the invention.
- In the drawings which illustrate a» suitable em
having a vertical recess iii in the front face
bodiment of the invention, a
»
thereof which, in e?ect, provides spaced vertical
v
Figure 1 is a perspective 'viewlooking toward‘ 50 side columns 82. Secured to the columns t2 by‘
the front and one side of the apparatus and il—_ - r upper and lower end clamping members 63 is a
lustrating its general arrangement; _
_
pair of spaced upright parallel carriage guide '
rods 46 upon which a reciprocable work support-'
Figure 2 is a rear elevation of the apparatus;
ing carriage 45 is mounted The carriage in
Figure 3 is an enlarged front view of the cen
tral portion of the apparatus, parts thereof be
55
cludes ‘sleeves. 0r cylinders 66, surrounding the
‘2,411,688
4
quenching head 51 the upper ?xture 58 is pro
vided,, the upper support 58 of which is secured
to the sleeves by split clamps 5811 through screws
guide rods 44 and connected together by a lower
chuck support 41, an upper chuck support 58 and
an uppermost bridge member 48.
‘The workpiece W to be heat treated, which, for
58b. In practice, in order to accommodate work
pieces of different lengths, the upper support 58
example, may be a liner for an internal combus
upon loosening of the screws 58b may be slid
tion engine cylinder, is supported, in proper posi
_ along the sleeves 48 to the desired position. The
tion for the heat treating operations to be per
support is open between the sleeves and receives
formed thereon, between lower and upper chuck
and supports at substantially uniformly spaced
?xtures 48 and 50 (to be later described) respec
tively carried by the chuck supports 41 and 48. 10 circumferential points three vertical cylinders 14
Supported on the upper ends of the guide rods , having pistons 15 reciprocable therein from
which depends rods 15. , These rods support an,
~ 44 by a cross member-‘5| is a switching trans-v
annular housing member 11 forming a part of
the upper ?xture 58 and which through spaced
ductor arbor 53 having an induction heating head 16 antifriction bearings 18 and 18 supports an annu
lar member 80 and an external sleeve 8I con
54 (see Figure 3) at its lower end.
-
former, generally designated 52, and depending
from the transformer 52 is an electrical con
nected together through plate 82. The’ annular
A quenching apparatus, generally designated
55 is supported in axial alignment/with the arbor
53 by a bracket 55 provided at the lower portion
of the frame between the guide rods 84, the nozzle
51 (see Figure 3) of which is-w'ithin the chuck
?xture 48 and the elevating and retracting mech
anism 58 therefor is disposed below the bracket
58.
-
.
,
2.0
member 88 through plate 83 supports an upper
chuck 84 which preferably is of the same type as
the lower chuck 1|. The sleeve BI is provided
with'gear teeth 85 which mesh ‘with a pinion
- mounted on the shaft 85 ‘of a motor 81 carried by
the supporting housing 11. The gear and pinion
being identical in gear ratio with 'the gear 13 and
It will be observed that the rigid frame 40, the 25 pinion 18a and otherwise, as are the motors 12
and_81,‘to effect rotation of the two chucks at
bracket 56, the guide rods 44, and the cylinders
identically the same speed.
'
45 bridged’by the members 41, 48 and 58 are
The cylinders 14 are connected together at bot
su?icient to provide a rigid supporting means for
tom and top by manifolds 88 and 88, the mani
maintaining the arbor 53, the workpiece W and
‘quenching apparatus 55 in accurate axial align 30 folds 88 and ‘88 connecting the lower and upper
ment with one another for precision work.
Referring to Figure 3 wherein the central por
tion of the apparatus is illustrated in enlarged
ends of the cylinders respectively as indicated at
80 and 8|. The manifolds are each provided with
section, it will be observed that the guide rods
58 and from thence to the source of operating
pressure through ?exible conduits 83 and 84.
The apparatus as illustrated in Figures 1 vand
3 shows the heating head 54 and the quenching
head 51 in operative position for the start of the
44 are each comprised of an upper member 58 and
a lower tubular member 5! threadedly joined to
’ gether by an intermediate‘ piston member 52.
Each of the carriage sleeves 45 constitutes 8. cyl
inder adapted to cooperate with a piston member‘
52 and having its ends slidably sealed on the‘
guide rod 44 by packing glands 53. Each sleeve
thus forms a double acting cylinder. Fluid under
pressure is admitted and discharged. through
ports 54 and 65 above and'below the piston mem
ber 62 into the cylinder to effect reciprocation of
the carriage 45, it being understood that admis
sion- of ?uid above the-piston members 82 will
elevate the carriage and admission of fluid below
the piston members I32v will lower the carriage.
The main lower ?xture support 41 is bored at
its ends to receive the sleeves 48 and is secured
to the sleeves 46 by split annular keys 54 ar
ranged partly in annular grooves in the sleeves
and between the lower ends of the sleeve receiv
ing bores 65 and the retaining collars 86. The
support 41 is provided with a central vertical
opening within which antifriction bearings 51
and 68 are supported to rotatably support an
annular spindle 58 to which is secured an annular
a connection 82 secured to the side of the support I
heat treating operation, the carriage being in ele
40 vated position.
To commence the heat treat
ment of the internal surface of the workpiece W
it is merely necessary to energize the heating
> head 54, supply quenching ?uid to the quench
head 51 and move the ‘carriage downwardly to
45 effect relative axial movement of the two heads
on the one hand and the workpiece on the other
hand.
'
‘
Since in order to place the workpiece in the
position shown, the heat head and the quench
50 head 51 must be separable from one another,
provision is made for elevating the quench head
into the position shown and retracting the same
to a lower position through the elevating and
retracting apparatus 58 which includes a ?uid
55 pressure cylinder 95 and piston 85 to which lat
ter the quench head supporting tube 81 is con
nected. The cylinder 85 is supported beneath
the bracket 55 through the upper cylinder head
88, the latter having a ?ange 88 bolted to the
work supporting member 18 of the lower ?xture 60 under side of the bracket 55. The cylinder 85 is
threaded into the-upper cylinder head as at I08
48.
and telescoped with a skirt extension I8I thereof.
The member 18 supports an annular chuck 1|
The lower end of the cylinder 85 is closed by the
of the resilient ?nger type such as is shown in
lower cylinder head I82 and a port I03 for sup
my Patent No. 2,288,037, issued June 80, 1942,
plying fluid under-pressure to the lower end of
the chuck being adapted to grip the lower end of
the cylinder is provided therein.
the workpiece W.
= ‘ _
In order to provide for the supply of quench
The lower end of the member 48 is provided
ing fluid to the heating head 51, the piston 95 is
with an annular housing 1Ia which surrounds.
so constructed and arranged as to act as a slide
gear 18 secured to the spindle 58, The housing
1 Ia supports motor 12, the shaft of which carries 70 valve to the end that the quench head when‘in»
elevated position may be supplied with quench
a pinion 13a meshed with gear 13 for rotating
ing ?uid through the tube 81. -The piston 85 is
the lower chuck ‘I I. '
'
In order to support a tubular article of con
siderable length such as the workpiece W in
accurate alignment with the heating head 54' and
provided with a central annular groove I04
adapted to cooperate with a series of ports I85
in the wall of and at the upper end of cylinder
- 2,411,698 T _
element‘ In by the annular member m which is
' 66, the ports’c'onnecting with an internal annular '
connected to ‘an actuating red “I. The rod I4| .
passage I06 in‘ the depending ‘skirt IOI vof‘the
is connected to a piston (not shown) which is
cylinder head so as to provide a passage to the
annular groove I04 in the piston from a quench
arranged within the motivating cylinder I42
ing'?uid supply pipe I01 connecting with the in
mounted on top of the transformer'casing I20.
ternal groove I06. The hollow tube 01 is con
nected to-the piston through a split key I03 and 1
The mechanism for actuating the primary ele- .
ment may be of anysuitable ?uid pressure op
erated type.
threaded lock ring I09 and is aligned with a cen
The arbor Sit-embodies concentric inner and
tral axial bore IIO extending through the piston
and which ‘bore is. capped at its lower end by the 10 outer-conductors I43 and vI44'resp'ectively insu
?anged combined packing retaining nut and plug 7 lated from each other by an insulating sleeve I45,
the inner conductor I43 being electrically con
II I. The annulargroove I04 is connected to the
nected with the ring I26 through connector I46
‘ central port IIO through radial .ports II2. The
and the outer conductor being connected with
upper head 66 is additionally provided with a
?uid passage H3 at the end of cylinder 95 for 15 the support I23 through the annular member I22,
the latter being insulated from member I22.
the admission of ?uid to the upper end thereof’
for ‘acting on the upper side of the piston for i The conductors I43 and I44 at their lower ends
(see Figure 10) are internally and externally
threaded respectively to receive heating ‘head
In order to provide for the drainage of quenche 20 adaptor elements I41 and I48. The adaptor ele
ment I" is hollow at its opposite ends and has
- ing ?uid supplied .within the workpiece W from
the quench head 51, the spindle-‘60 of the lower » an intemal' web I 49 provided with an axial
lowering the quenching apparatus under ?uid
-
pressure. .
threaded opening and surroundingipassages I50,
rotatable support is larger in;di'am'eter than the
The element In is threaded into the inner con
piston rod 91 to provide an adequate annular
drain passage to a ‘point ‘adjacent the bottom of 25 ductor I43 and is insulated as at I5I from the
outer conductor I44.’ Adaptor element I46 is of
the lower/motor support casing member ‘II, which
an annular formation threaded to the outer con
is secured to the‘ main chuck support 41, both be
ing non-rotatable.
. ductor I44 and having downwardly extending
.
contactor ?ngers I52.
‘The bottom of the gear casing and motor sup
-.
‘
I port member 'II is provided with a'central aper 30 , The heating head 51, which forms the subject
matter of and is described and claimed‘ in my
ture II4 andv aniupstanding sleeve II5, the sleeve
. copending application Serial No. 336,129, ?led
_ having at its upper end a ?uid-tight washer II6
May 20, 1940, comprises in general, an annular
-_ engaged with the lower end of the spindle 69. A
chamber I" through which the quench tube 91
passesyis provided'with a} water-tight ‘packing
II6 at‘its lowerend and is secured to the under
support I53 supporting a surrounding core I54 '
35 which in turn supports a tubular heating coil I55,
‘ and an internal hollow sleeve I56 insulated by a
side of the bottom -of the motprsupport and gear
non-conducting‘sleeve I51 from the support I53.
casing ‘II and in alignment-J with ‘the aperture ’
One end of the coil I55 is insulated from and
extends through the support I53 and is electri
cally connected to the sleeve I56, the connection
II5, the chamber being provided with an offset.
drain pipe H9 so that the quenching ?uid fpass
' ingdownwardly through spindle 69 may be .car
ried away therethrough.
The switching transformer 52- as shown in V‘
being hollow to provide ‘communication between
the coil passageway I 55 and the bore I59 of the
sleeve I55. The opposite end of the coil I55 is
connected to°the support I53 which has a passage
scribed and‘ is claimed in my Patent No. 45 I60 through the wall thereof communicating
2,348,082, the application for which was a division _ , with the coil passageway I58.
The sleeve I56 ?ts snugly within the end of the
of this application, includes, in general, a hous-T
adaptor III‘? in electrical contact therewith and
ing IZII having a bottom supporting plate I2I
the support I53 extends within the contactor
which supports an annular member I22 which in
turn supports an annular secondary element, 50 fingers I52 in electrical contact therewith, the ,
head being secured to the adaptor element It?
the secondary element embodying a support I23,
by a bolt lei extending through the sleeve I56
' a surrounding magnetic core I26 and a water
in spaced. relation except for its head portion
cooled secondary winding ‘I25, One terminal of
I62, and threaded within the web I49 of the
the winding I25 is electrically connected to the
support I23 and theother to an annular ring I26 55 adaptorv element- as indicated at I53. The lower
end of the annular support is provided with a
within-and insulated from the support I23., Suit
valve means comprising an upper valve part I66
able cooling water conduits I27 and I 28 are con
nected through the support I23‘ and ring I25 ' threaded into the lower end of support, a lower
respectively to the winding terminals for, con
annular valve part I 65 also threaded‘ into the
Figure 7,,whi'ch is more clearly shown and de
ducting cooling. water through the winding.
The primary element of the transformer is
60 same end of the support but spaced from the part
I64 to provide communication between the sup
_ annular in form and embodies an annular shell.
. port passage I60 and the space I10 between the.
I29 which houses the magnetic core I 30 ‘and water
parts I64 and I65, and a ball member I56 nor
mally closing the axial opening It] in the end
cooled primary winding I3I, the terminals I32
and I33 thereof extending outwardly through the 85 I58 of the lower valve part I65. The end of the
shell I29 and an elongated slot I34 in the casing
no and are connected to terminals I35 and 136‘
respectively which lead to the source of ‘power
(not shown). Suitable ?exible water co'hducting
conduits I37 and I33 are connected to the ter
minals I35 and I36. The primary winding sup
porting shell I29 is slidable inthe casing I 20 from
party I65 is conical as indicated at I69.
‘The inner conductor I4‘? of the arbor 53 is
tubular to provide a passage III for conducting
, cooling ?uid through the inner adaptor passages,
70 I50‘ and thencethrough the sleeve bore ISQ to the
heating coil I55.
.
1
'
Since it is desirable to provide a capacitance
connected in parallel with the secondary of the
transformer and the heating head, a plurality of
rounding relation. with respect to a magnetic‘ 75 capacitors I12 (see Figures 2, 8 and 9) are pro=
the coupled position shown in Figure '7 to an un
coupled position adjacent the'plate I2I in sur
9,411,009
‘
-8
vided within the frame 00 near the top thereof.. " thence through conduit I88 back to the pump
‘Connections to these capacitors are provided v I88. Suitable ?ow switches I88 and 280 are as
through a pair of concentric ‘tubular conductors
sociated with the return conduits I81 and I21
I18 and I14 separated by an insulating sleeve I18, ‘
respectively for a purpose to be later described.
the conductor I13being threaded ‘into the arb’or
L With reference to the means for effecting re
conductor I08 and the conductor I10 being elec-"
ciprocation of the carriage cylinders 08, the ?uid
pressure actuating system therefor is diagram
matically‘shown in Figure 14. A dual supply of
trically' connected to the outer-arbor conductor ‘
' 1|“ by a suitable connedtbr I18.
Suitable con- 7
nections I11 and I18 extend from the other} ends - oil or‘ other ?uid under pressure is provided by
of the conductors I10 and I10, respectively, to the 10 pumps 20I and 202 which are driven by a, motor
capacitors I12. Connected with the inner con
208, the pumps delivering thev actuating ?uid
ductor I13 is a conduit I18 for conducting cooling
from a sump 280.
i
,_
?uid through the conductor I18 to the inner con-.
The pump 202 delivers ?uid under pressure
ductor of the arbor. This conduit connects
through pipe 288 to a magnetically actuated con
through a manual shut off valve I80 with con 15 trol valve 288, there being a pressure relief valve
duit I 88 which receives cooling ?uid under pres
201 in pipe 208 for relieving line pressure when
sure from a motor driven pump I82 (see Figure
control valve 288 is in the center position indi
15). Associated with the conduit I86 is a ?ow
cated. Raising oi the upper chuck ?xture 88 is
switch I88, the function of which will be later
e?ected by energizing valvesolenoid 208 Of the
described.
7
20 control valve 208 .to shift the valve 208 so as to
The quench head 80 (see Figure 10) is com
deliver ?uid to conduit 208 through a check valve
prised of the‘enlarged upper end 888 of the tube
2I0 and thence through conduit 88 to the mani
81 which supports annular inner and outer parts
fold 88 in the upper cross support 88 (see Figure
313i and 382, parts 88I and 882 being axially
3) and thence to the cylinders 14. lowering of
spaced to provide a‘ circumferential discharge 25 the chuck is prevented by check valve 2I8 which
passage 803 and having a supply chamber 300
is spring biased and prevents return ?ow of ?uid
therebetween which receives quenching ?uid from
except under positive pressure. To: lower the
the bore of the tube 81 through a passage 888
chuck ?'xture 88, valve solenoid 208'. is deener-,
and circumferential recess 808 in the enlarged
gized and-valve solenoid 2I2 of valvel208 is ener
upper end and ports 381 in the wall of part 88L 30 gized to supply ?uid through conduit 88 and
The upper end 300 is provided with an axial
thence to manifold 88 (see Figure 3) , which forces
pocket 808 and an upstanding pin 808. The up
the pistons in cylinders 10 downwardly, forcing
per end is also provided with-a conical wall 8I0
' the dischargeoi ?uid through conduit 83 and
which when the heads are brought together en
overcomin g the heat of the. check valve 2I0,
gages the conical wall I88 of the heat head valve 35 . thereby
permitting drainage of the ?uid to the
part I85 in ?uid tight sealed relation. In this
sump 200‘through valve 288 and pipe 2“.
position of the heat head and quench head, the
Upward and downward movement of the car
' pin 308 raises the ball I88 from its seat to permit
riage is effected through the application of ?uid
the ?ow of cooling ?uid into the pocket 888.:
under pressure derived from pump 28I which is
The cooling ?uid ?ows from the pocket 308 40 so adjusted as to deliver ?uid under speci?c pres
through a downwardly extending passage 8“
sure whereby to ‘provide for accurate control.
formed through’ the enlarged end 380. Quench
Upward movementv of‘ the carriage is effected by '
ing water, as well as water under pressure for
energizing valve solenoid 2 I8 of control valve 2I8
lowering the quench head 81, is taken from the
and valve solenoid 2 I 1 of control valve 2I8 where
water main I84 (see Figure 15) and after passing
‘by ?uid under pressure will pass from pump ‘20I
through a, ?lter I85 and the same raised in pres
through conduit 2Iv8,\control valve 2I8 and con
sure by a booster pump I88. is delivered through
duit 220 to control valve 2I8. From valve 2I8,
pipe I01 to the cylinder 88. Water from thesame
?uid under pressure ?ows through a biased check
supply and under the control of a valve I88 is
valve 22I by way of conduit 222, to pipes 228
delivered through pipe M8 to the cylinder 88 M which extend within guide rod portions 8| (see
above the piston 88 for loweringv the quench
Figure 3) and admit ?uid into the cylinders 48
head 51.
'
'
Cooling water is delivered from the same source
through conduit I80 having a ?ow switch "I
therein for cooling ‘the capacitors I12.
Air from a source of air pressure (not shown)
is delivered through conduit I81 having an air
filter I88 therein and thence through a control
_ valve I88 to the conduit I08 for delivery to the
cylinder ‘8| into the space below the piston 88
to raise the quench head'81.
-
Air from conduit I81 is also supplied to con
duits I92 and I83 for controlled delivery through
valves I80 and I88 respectively to the actuating
mechanism I42 (see Figure 1) for e?ecting
switching movement of the transformer primary
winding -I3I.
Circulation of cooling ?uid through the trans- '
above the pistons 82, the ?uid under pressure
thus'elevating the carriage to the position shown
in Figure 3, this being the position for the start
of the- heat treating position. During the up
ward movement,'the ?uid in the cylinders at the
'under sides of, the pistons 82 is discharged '
through passages 88 (see Figure 3) and thence
through pipes 220, also within the guide rod por
tions 8I (see Figure 3), pipe 228, and through
control valve 2 I8 to the sump 280 by way of drain
pipe 228.
-
Lowering of the carriage, may be effected in
two ways, one of which is accurately controlled as
to rate of movement, and which is employed dur
ing the actual heat treatment, whereas, the other
is faster and permits the rapid return of the car
riage to the starting position.
7
former windings is effected through the medium
The controlled rate is effected by the energize.
of a circulating pump I88 which delivers the cool 70 tion of the valve solenoid 221 associated with con
ing medium from a source (not shown) to the
‘trol valve 2I8 (this, Of course ‘after deenergiza
primary and secondary conduits I38 and I28 re
tion of solenoid 2I8) so as to deliver ?uid under
spectively. The cooling ?uid returning through
- speci?c pressure from the pump 20I through pipes '
primary and secondary conduits I31 and I21 re
228 and 220 to cylinders“ below the pistons 82
spectively ?rst ?ows through a radiator I81 and 78 thereby lowering the carriage. Lowering move
_
ment is restricted". however, by the’ discharge of
fluid from the upper ends of thecylinders 43 and
through pipes 223 and 222 and'the valve 2l8, thev
solenoid 2" of which is deenergized during .this 5movement, by a metering valve 223, the valve 223,
discharging the fluid through pipe 223 for return,
to the sump 204. The metering valve 223 is so ad
,
justed as to ?x the rate at which fluid may dis
.
10-
‘
.
.
Figure 2, 'and' driven b'y‘aneleotric motor 242, the
controller being mounted in the framework 43 at
the rear of the machine. This controller, which
forms the-subject matter of my divisional applica
tion, Serial No. 450,034, ?led July 7, 1942, may be‘
of the .
drum type for actuating a number of .
switches A to L, respectively, in predetermined‘
‘sequence (see Figure 13 and- the wiring diagram
'
Figure 16).
,
I
charge to the sump to thereby positively control 10: or> To
best understand the automatic operation or
1' the downward carriage movement so long as valve
apparatus, reference may be had to the dia
"solenoid 2 I1 is deenergized and the metering valve , the
gram of Figure 16. Before describing the opera
223 positively connected in ‘the discharge circuit.
tion, it will be necessary. to ?rst consider the I
For rapid downward movement, the solenoid 2"
function of the various limit switcheswhich with
may be energized by shifting the valve 2“! to per 15 'the
sequence controller‘ provide .a space-time con- .
mit ?uid‘return through pipe 223, valve 2I3 and
trol,
.
pipe 225 to the sump 204, it being understood'that
Limit switch _L-i operates to close a circuit _
solenoid valve 221 is energized at this time.
onlyv when the top and bottom chucks "are in
- Since it is essential for safe operation of the.
proper spaced arrangement and engagement with
' machine that the lower and upper chucks ‘II and 20 the workpiece 0W, whichv circuit, must be closed
i 34, respectively, be precisely in correct engage
of the machine can re-‘ _
ment with the workpiece vW and that the work . ' before’ further operation
" suit.
7
piece be of the proper length, a limit switch L;-—l
Limit switch L-2 is a closed circuit switch
- is provided to prevent operation of the apparatus ' which is opened by the carriage when elevated‘
in the event the chucks do not accurately position 25 to a desired position or upper limit.
themselveswith respect to each other for a given
Limit switch L--3 is a‘ pre-set safety switch and
‘
workpiece. For this purpose, as will appear in P
Figure 1, the upper chuck ?xture 50 is provided
with a bracket 230 (see also Figure 12) secured
to the housing 11 to which bracket an upwardly. ~,'
{l
.
is closed at the upper limit‘I ._or position or at a '
particular point in ‘the initial downward‘ travel
' of the carriage, closure thereof being required
before the high frequency power can be applied
extending rod 23! is secured, the rod at being ’30_ to the transformer and coil of the heating head.
arranged'to reciprocate, with the upward and
Limit, switch L-4, normally open, is rclosed
_ downward-chuck opening and closing movementv
upon the carriage‘moving toward or approach,
of the upper chuck ?xture, through a guide brack
' ing an elevated position and after the’sequence
et 232 secured to the upper support 53. The upcontacts F are closed to establish field I
per end ofv the rod\23l is provided with an adjust 35 ; controller
excitation ‘in the high frequency generator in
able cam 233 adapted to engage a slidable plunger -
anticipation of heat treatment.
'
234 which actuates the contacts of the limit switch
Limit switch L-5 is closed at the upper limit
L—l, the-limit switch being ?xed to the bracket
.‘or at a particular point in the initial downward
232. Thus, the upper chuck 34 must be in a pre
travel of the carriage, closure thereof being re
determined lower workpiece engaging position 40 quired before the switching transformer can op
before the plunger 0! the. limit switch Lf-l can
be engaged by the‘ cam 233, Figure 12 showing this
engaged position. The operation of the limit
switch L—ll inv the system will be presently de
scribed.
.
.
'
g
The uppermost cylinder bridging member 48
(see Figures 1 and 9). is provided with a depend
ing sleeve 235 slidable onv and surrounding. the
heat head arbor 53 which during downward heat
vtreating movement of the carriage serves to pre
vent any possible lateral de?ection of the arbor
and heat head relative to the workpiece whereby
to insure accurate axial .ali'gnmentduring the
erate to coupled position.
‘
Limit switch L-B, normally closed, is adapted
to be opened upon the-‘carriage arriving at a lower
45 position at the end of the heat treating operation
to terminate the heating.
-
‘
<
Limit switch L-—'|, normally closed, ,is‘ opened
upon the carriage arriving at the end of its heat‘
treating movement, and opens the field excitation '
tic-circuit of the generator.
'
-
' Limit switch L-3, normally closed. terminates
the constantspeed downward movement of the
carriage.'
-_
,
"
.
'
Limit switch L-9, normally closed, is operative
heat treating operation. .
55
to
terminate the ?nal downward movement of
In order to automatically control the carriage
movement‘ and other functions of the apparatus,
including the heating and quenching operations,
the
carriage.
.
'
-
>
'
The sequence controller switches A to L are all
open circuit switches and operate to close circuits
at predetermined times, as now will be described.
which depend upon the movement of the carriage,
cam, carrying bars 236 having adjustable cams, 60 Referring to Figure 16, current is delivered
generally designated 231, thereon, are secured to ' through'a three phase line.245, 243 and 241, and
the carriage cylinders 46 (see Figures 1, 3 and 11) .
These cams are adapted to open and close various
to commence operation, the switch 246 for the
sequence controller motor 242 is closed which
limit switches L-—2 to L-9, mounted on the col
I establishes a circuit 243 with the phase 245, 241.
umns 42 of the frame 40, during upward and
downward movement of the carriage. The ops 66 Included in this circuit is a solenoid 249 which
whenci'rcuit248 is energized closes switches 243a
_ eration and function of these limit switches will
and 24% in circuit 250 which ‘includes the se
be presently described.
=
quence controller motor 242, thus starting the se
Associated with the front of the machine for
quence controller 2“ in operation. Energization
convenient access are several manual control
switches, viz, a master safety on and off'switch 70 of solenoid 249 also closes a switch 2430 in a cir
cuit 25l to condition this circuit for operation
233, a safety heat-off switch 233, and a master
which includes a solenoid 252 in series with the
starting switch 240.
normally open master starting switch 240 and
The automatic control of the operation of the ‘ the
normally closed master safety switches 233.
machine, after initial starting, is mainly by a se
75
Included
alsoin this circuiti's a manually closable .
quence controller 24! shown in dotted outline 'in
9,411,558
-
,
11
,
_
'
switch 253 which is‘closed normally. but is shown
12
-
255 and I9I open and heat ‘the circuit to the re
as open in Figure 16. Bridging the master switch
lay solenoid 255, switch 255!) having been opened
245 is a locking circuit ‘which includes a normally
with the opening of ‘sequence' controller switch
open switch 252a actuatable by solenoid 252.
K unless the clutch has been released/by the
The circuit 25I vconstitutes a master starting
opening of normally closed switch 2550 by the
circuit which is e?ective for energization on the
energization of relay solenoid 255. Such cutting
closure of solenoid switch 2490. Further circuits
out of these pumps will obviate needless operare divided into two stages, viz., a ?rst stage 255
'ating of the ‘same under the conditions stated.
and a second stage 254. Upon manual closure
With the energizing of the second stage 254,
'of the master control switch 245 the circuit 25I 10 .and through the subsequent closing or the se
is energized which through energization of
solenoid 252 closes switch 252a to lock out the
master control switch 245 and‘ closes switches
25% and 252c to connect the ?rst stage 255 with
quence controller D the valve solenoids “trend 7
2" of the carriage control are energized, the re
lay switch 255c in branch circuit 259 with sole
.noid 2I5, having been closed as a result of clo
phase wires 245, 241.
15 sure of sequence controller switch K and the en
With additional reference now to Figure 13,
which is an operation diagram the heavy lines A
to L corresponding to the period of operation of
ergizing oi’ relay solenoid 255. As a result, the
carriage is caused to elevate until limit switch
L-2 is opened by a cam on one'oi the cam bars,
the various elements by the sequence controller ,
which thus deenergizes the control valve sole
switches A to L, and the horizontal lines A to L. 20 noids2l5 and 2H. During this upward move
dotted and heavy corresponding to time intervals
ment or the carriage ; the sequence controller
0 to 100, after energization of the ?rst stage 255.
switch
F closes, and limit switch L—-4 also closes
and upon'closure ofsequence controller switch
near the end of this stroke which energizes re
K, relay solenoid 255 is energized which closes '
lay solenoid 215 to in, turn close switch 215a,
, relay switch 255a. If ?ow switches I99, 255 and 25 looking out limit switch L-4, and closing the
I§9I (see Figure 15) are closed, in which case a
switch in the generator ?eld circuit 21I. The
lamp 255 (on the front of the machine) will be
high frequency generator is thereby prepared for
lit, thus indicating a normal ?ow of cooling ?uid
power generation. It is to be noted at this point
to the transformer primary winding, transformer
that
one 01' the important features of the pres
secondary winding and the capacitors, a circuit
ent invention is that if the limit switch L-I
251 will be completed through relay switch 255a
failed to close during loading of the chucks with
which through a signal lamp 255, on the front of
the workpiece, due to improper positioning of the
the machine will indicate an interval during
workpiece or a workpiece of improper length
which loading of the workpiece into the carriage
which prevented lowering of the upper chuck to
may take place. This interval is indicated by
the heavy line'K of Figure 13.
Upon loading the lower chuck with a work
35 the exact predetermined position, relay solenoid
piece W, the upper ?xture and chuck may be .
caused to close upon the closure of sequence con
255 remains deenergized with the result that re-"
lay solenoid 252 is unable to cause energization
oi’ the second stage 254. Therefore, no, damage
can be caused to the apparatus incident to im
troller switch 0, provided that the switch 255 40 proper loading or loading with an improper work
is closed for automatic operation, a circuit be
piece.
‘
ing completed between the extension 2411: 01’
When the carriage reaches its upper limit,‘ sei- -
line 241 and line 245 through switch 255a, se- ,
quence controller switch 0 and valve operating
solenoid 2I2, the latter operating. to energize
valve 255 (seeFigure 14) to deliver ?uid under
pressure to the upper ends' of cylinders "to
lower the chuck into engagement with the work
piece W.
Switch 255a is a ioggle switch for use
in obtaining slight movement for adjustment oi’
the upper ?xture.
Closure oi’ the limit switch
L-—I is effected only when theupper chuck is‘
in proper position.
Limit switch L-I, relay switch 255b, sequence
controller switch _A are arranged to complete a
circuit 259 through relaysolenoid 255 and ?ow
switches I 99, 255 and I9I to close relay switch
255a in parallel with relay switch 255b'and to
also close relay switch 25% which closes circuit
25I, circuit 25I including a relay solenoid 252. '
Previously upon energization of the ?rst'stage
quence controller switch E closes to energize re
lay solenoids 21I and 212 to close motor switches
21 Ia, 21Ib and 21Ic for the chuck rotating motor
12 and motorswitches 212a, 2121) and 212c for
the chuck rotating motor 51, thus causing simul
taneous rotation of the chucks and workpiece W.
’
Also at this time. valve ‘solenoid I59 is energized
50' causing compressed air to raise the quench head
51 into engagement with the heating head 54.
At the same time, the booster pump I52 is set in
operation through energization oi’ solenoid 215.
. When the quench head 51 engages the heat
55 head 54 the pin 559 raises the ball valve I55 01’
the heat head (see Figure 10) from its seat to
openthe cooling ?uid passage through the quench
head pocket 555 and passage 5| I. Upon the
‘booster pump I52 buildingup a predetermined
pressure necessary for adequate cooling, the ?ow
switch I55 closes. Sequence controller switch G
255, the cooling water supply pump I95 and the
then closes circuit 214 to cause energization of ‘
oil pressure supply pump motor 255 having been
relay solenoid 215 to set the quench ?uid booster set in operation by the relay switch solenoid 255
pump I95 inoperation to supply quenching water
which is in series with the normally closed switch 66 to the quench head 51. .
. '_ ,
254, which is a switch that must be closed first
At
approximately
this
same
time,
sequence
con
for automatic operation.
‘
switch I closes circuit 225, energizing re- ‘
Energization or the second-stage 254 isef- I troller
lay solenoid 221 of valve 2 I 5 resulting in the grad-.
fected by the energization of relay solenoid 252
'ual and uniform downward feed of the carriage,
which closes the relay switches 252a and 252b. m the speed being controlled by the adjustment oi
If, however, operation oi'the second stage a?
the metering valve 225 (see Figure 14). As the f
paratus is not desired, a timer motor 251 is
carriage
leaves orpasses the limit switch L-5
adapted through clutch 255 to open switch 255d
.in its initial downward movement, switch 255a, '
which stops the cooling water pump I52 and oil
which was previously-closed with‘the relay sole
pump motor 555. As a result ?ow switches I 59, 75 noid 255, acts'through closed limit switch L-5
2,411,098
,
13
"
>
.
.
I‘
_
_
,
their energy for ‘operating valve solenoids 221,
locking out limit switch L-3 which subsequently -' 2|! and M1 from ‘the extension leads 2": and
to energize relay solenoid 219 to close switch 219a,
241:. Similarly therev are provided manual
switches‘ 29! and 299 bridging sequence controller
opens, and to close switch 219b upon closure of
the sequence controller switch L. This operates
switches C and B, and connected in circuit with
extension leads 2“: and 241:: and valve solenoids
the power relay 280 providing power to the switch
ing transformer 52. Relay solenoid 219also closes
2l2 and 208 to open and close the upper chuck
switch 2190 so that when limit switch L-5 and
?xture at will.
‘
sequence controller switch J close, relay S0187
The general operation or the apparatus should '
mm 28! becomes energized. Energizaticn oi '
solenoid 28! closes relay switch‘28la to lock. out 10 readily appear from the foregoing, particularly
from the description relative to Figures 13 and
limit switch L-5 and closes solenoid 282 which
16. Brie?y, however, with the carriage in its low- through the actuating mechanism 84 (top of Fig
ermost position, after setting the machine for au
ure 1) moves» the transformer primary l9! into
‘coupled relation with the primary secondary I25
~ tomatic operation .through closure of switch 285,
whereby to supply current to‘ the heating head 94.
If the booster pump J82 fails to supply cooling
?uid to the heat head coil under su?icient ?ow
ing the period the light signal 258'is lit (sea K
the workpiece is loaded into the lower chuck dur
of Figure 13-). > Thereafter, the. upper chuck
lowers to engage the upper end of the workpiece
conditions for adequate "coil cooling, then flow I
and the carriage is elevated to its uppermost po
switch I 88 remains open and prevents energize-i
sition (see C and D of Figure 13) . Thereafter, ro
' tion of relay solenoid 219 and as a result the
switching transformer cannotbe actuated to sup
ply current to the heat head coil.
Should emergency conditions require that the
tation of the workpiece commences, the quench
head is ‘elevated into engagement with the heat .
' head and quenching ?uid is supplied to the
power be cut off, the manually operable heat- ' quench head ‘(see E and G of Figure 13). Gradual
o? switches 239 may be actuated to open the cir 2,5 downward movement commences together with
actuation of the switching transformer and de-'
. cult to the relay solenoid 219, thereby opening the
livery of power to the heat head coil (see I, J and v
circuit to the relay solenoid RI and transformer
solenoid 282.‘
‘Y
L. 01' Figure 13), so that the workplace is pro
gressively heated and quenched thro ghout the
desired length at which time movement is ar-,
.
This all takes place at the early stage ot-‘the
cycle as seen from the .operating cycle of Figure
13, and is substantially the condition which pre
’ vails whenthe parts are in the position shown in
30
.
.
rested .for the dwell while the power is cut of! and
v quenching and rotation continues.
Thereafter
rotation stops, the quenching head retracts and
‘the carriage rapidly returns to its lowermost po-.
The carriage carries the workpiece W down-_
wardly at a rate of, for example, one to two inches 35 sition, at which point the upper chuck ?xture ele
vates to provide access for‘ removal of the work
per ‘second, depending upon the desired rate of
heating of- the bore of ‘the workpiece to recal
Figure
3.
>
,
a
.
piece.
ternal layer of metal.
I
-
> As the carriage reaches the end of its controlled
.
_
’
310 organization whereby failure of various parts
thereof or failure 01' certain predetermined op,
erating conditions acts to prevent injury to the
downward travel, which corresponds to the heat- .
ing period (see _J of Figure 13), limitswitch L—8
opens the circuit’ to valve solenoid 221, thereby
causing e carriage to dwell, and at substantially
-
As heretofore pointed out a number of safe- '
guards appear throughout the apparatus and its ,
_escence and quenching to produce the desired in
'
apparatus.
‘
'
e
'
, Various features oi’ the invention, although but
the same time sequence controller switch I opens, 45 brie?y described herein, are disclosed‘ and claimed
assuring the dwell at this timer Atsubstantially
the same time limit switch L—8 opens the cir
, cuit through relay solenoid 219 and as a result
relay switches 2191) and 2190 open and the trans
former solenoid 282 deenergizes‘, thereby cutting
off the’ supplysof‘ power to the heat head coil.
in copending applications as follows:
,
Serial No. 336,129, filed May 20, 1940, and relate
ing to the heating head and its cooperation with
the quenching head; Serial No. 419,828, ?led No
50 vember 21, 1941, and relating to the quenching
"h??di Serial Nos.‘444,_346 and 507,817, ?led May
- '25, ,1942, and October 2'1, 1943,‘ respectively, and
relating to the mechanism for actuating the
After a predetermined. dwell period, sequence
controller switches H and D close to reestablish
quenching head; Serial No. 444,347, ?led May 25,_
a circuit through valve solenoid 221~jand a cir
cuit through alve solenoid 2I1 causing the car 55 1942, ‘and relating to the work supporting car
riage to move downwardly ‘at a rapid ‘rate until . riage; and Serial No. 450,034, ?led July '1, 1942,
and relating to the sequence controller. limit switch L—9 is reached which then‘op‘ens to
Though only one embodiment of the invention
deenergize valve solenoid 221 to ‘cause the car; . has
been illustrated and described, it is to be .
riage to come to rest in its lowermost position.
Sequence controller switches‘, H and D open at v(m understood that the invention is not limited there
about this time.
,
1;
.
Sequence controller switch iii.‘ opens Just prior
to the opening of switches H and D thus lower
ing the quench head by cutting off the air pres
sure, permitting water pressure to e?’ect this re
to but may be embodied in various forms.' For -
example, workpiece holders, heads etc., may be
varied to hold and operate. upon various types of
workpieces and the operation of switches and
05 mechanism may be varied to suit requirements as
desired. As such changes in construction and ar
rangement of parts may be made withoutdepart- '
ing from the spirit of the invention as will be
.When the lowermost position of the carriage
' is reached sequence controller switch B'closes to _ apprrent to those skilled in the'art, reference will
energize valve solenoid 208 and raise the upper 70 be hadto the appended claims for 'a de?nitionof
traction. Also, at the same time ‘the high pres
sure cooling water to the heat head is cutoff.
chucking ?xture to disengage the _workpiece W
. and thereby permit removal of the’ workpiece.
Through the provision of log switches 283 and
284, upward or downward movement of the car
the limits of the invention.
/
'
What is claimed is:
1. In an induction heat treating apparatus, a .
frame a heat treating coil supported from one
riage, at will, is provided for, the same. deriving 7:; end or said frame, a quenching device supported 7
15
9,411,“:
from the other end, work holding means mounted 1
16
5. In a heat treating apparatus having an elec
on said frame, means for moving said quenching _
tromagnetic inducing head; a quenchinghead;
device into and out of operative relation with said
a work holder; means for effecting relative move
ment between said heads and work holder and
coil, means for moving said work holding means -
to place a workpiece held thereby in heat treating
an electrically operatable control device therefor;
relation to said coil, means to energize said coil,
and means responsive to the positioning of said
means for supplying electrical energy to said in
ducing head and an electrically operatable con
quenching device in operative relation with said
trol device therefor; means for supplying quench
coil and associated with said energizing means , ing medium to said’ quenching head and an elec
10 trically operatable control device therefor; and
for controlling the energizing of said coil.
2. In a high frequency heat treating apparatus,
a- clamping device carried by said work holder
a heat treating coil having‘ ?uid cooling means
and means for moving said clamping device to a
predetermined position to properly locate a work
associated therewith, a quenching device adapted
to be moved into and out of operative relation to
piece to be. heat treated in said work holder;
said coil, means interrelated to said quenching 15 control means therefor comprising a source of
device and coil and their normal operative posi
electric current, an operating circuit connectedv
tion with respect to one another for controlling
with said source and including said control de
the ?ow of ?uid in said cooling means, and means
vices and switch means for making and breaking
dependent upon the ?ow of ?uid in said cooling
the connections between said source and operat
means for controlling the supply of current to 20 ing circuit, electrically operatable means for clos
ing and opening said switch means, a conditioning
_
3. In an inductionheat treating apparatus, an
circuit connected with said source and including
inducing head, a movable quenching head, means ' said electrically operatable means and having
for relatively moving said heads into and out of
starting contacts and a normally open switch,
operative relation with respect to each other, a 25 . therein, said normally open switch being actuat
able to closed position solely upon movement of
movable work holding means having a movable
said clamping device to said predetermined posi
work clamp thereon, means for moving said‘ work
holding ‘means to place a workpiece clamped
tion whereby upon closure of said starting con
_ thereon in heating and quenching relation with
tacts energization of said electrically operatable
said heads, means to energize said inducing head, 30 means to connect said operating circuit with said
source is dependent upon: said clamping device
a ?rst control means associated with said ener
gizing means and responsive to the positioning 0!
being in itsv said predetermined position, said
clamping device moving means having an elec
said quenching head in operative relation with
trically operatable control device in said condi
said inducing head for controlling the energizing
of said head, and a. sec'ond control means asso 35 tioning circuit in parallel with, said starting con
tacts and normally open switch.
ciated with said energizing means and with said
said c011.
moving means for'said work holding means and
being responsive to the movement of said work
clamp for controlling the energizing of said heat
I 6, In a heat treating apparatus having a
quenching head, an electromagnetic ‘inducing
head provided with means for supplying electric
ing head and the movement of said moving means, 40 energy thereto, an electrically operatable switch
means for controlling said supply of energy and
said ?rst control means being ine?ective to con
a cooling passage therein for cooling mud, and
trol the energizing of said heating head inde
means for relatively moving said heads into and
pendently of said second control means.
I
out of operative relation; control means compris
4. In a heat treating apparatus having an elec-/
tromagnetic inducing head; a quenching head; a 45 ing a source of electric current, a control circuit
connected with said source and including a switch
and said electrically operatable switch means for
energizing and deenerglzing said switch means,
electrically operatable control device therefor;
means responsive to a change in the ?ow of cool¢
means for supplying electrical energy to said in
ducing head and an electrically operatable con 50 ing fluid through said passageway for actuating
said switch, and means responsive to the posi- _
trol device therefor; means for supplying quench
tioning of ' said heads in operative relation to
ing medium to said quenching head and an elec
change the ?ow of cooling ?uid through said
trically operatable control device therefor; and a
passageway whereby said ?ow responsive means
clamping device carried by said work holder and
I
means for moving said clamping device to‘ a pre 55 actuates said switch.
7. In -a heat treating apparatus having a
determined position to properly locate a work
work holder; means for effecting relative move
ment between said heads and work holder and an
\ 7 piece to be heat treated in said work holder: con
summing head. an electromagnetic inducing
trol means therefor comprising a source of elec
head provided with means for supplying electric
energy thereto, an electrically operatable switch
means for controlling said supply of'energy and
a cooling passage therein for cooling ?uid, and
means for relatively moving said heads into and
tric current, an operating circuit connected, with
said source and including said control devices and
‘switch means ‘for making and breaking the con
nections between said source and operating cir
cuit, electrically operatable means for closing and '
opening said switch means, a conditioning circuit
connected with said source and including said -
electrically operatable means and having start
ing contacts and a normally open switch therein“
said normally open switch being actuatable to‘
out of operative relation; control means compris
. ing a source of electric current, a control circuit
connected with said source and including a switch
and said electrically operatable switch means for
energizing and deenerg'izing said switch means,
means responsive to a change in the ?ow of cool
ingi?uid through said passageway for actuating
closed position solely upon movement, oi.’ said
clamping device to said predetermined osition 70 said switch, and means responsive to the posi
,_,_,Yl1._¢}_'§by upon closure of said starting contacts
tioning of said heads in operative relation to
energfz'ation of said electrically operatable means
change the ?ow oi’ cooling ?uid through said pas
sageway whereby said ' ?ow responsive means
to connect said operating circuit with said source
is ‘dependent upon said clamping device being in
actuates said switch, said'positioning responsive
75 means comprising a normally closed valve in said
its said predetermined position. .
‘
2,411,698 '
l7
s
a
a
relation;
\
18
cooling ?uid to said passage, control mechanism
associated with said passage and quenching head
and responsive to movement of said inductor and
quenching head to said position ,of adjacent re=
lationship to permit predetermined ?ow of cool-, ‘
passageway and arranged to be opened by said
quenching head in said position of operative
-'
8. In an induction heat-treating apparatus, an '
inductor, a quenching head, said inductor and
head being relatively axially movable into and out
of an adjacent heat-treating position, means for
ing ?uid through said passage, and means re
e?ecting said relative movement, means for ener
gizing said“ head, and control means associated
with said inductor, said quenching head and said
energizing means, said control means being re
sponsive to the relativevmovement of said induc
tor and quenching head and operative to cause
ated with said- energy supplying means to pre
clude energization or said inductor in the absence.
of said predetermined ?ow of cooling ?uid.
10. The combination with an electromagnetic
inducing head having a cooling passage therein,
energization of said inductor when said inductor
tively movable into and out of a predetermined
15 ‘position of adjacent relationship, of means op
and quenching head are in said adjacent heat
sponsive to said flow of cooling ?uid and associ
and a quench head, which said heads are rela
treating position and precluding energization of
erative in said position of adjacent relationship
said inductor in the absence of said’ adjacent
for establishing a.‘ flow of coolant through said
, passage, an energizing circuit for said inducing
' 9. In an induction heat-treating apparatus, an , head, means for opening and closing said circuit,
inductor having a cooling ?uid passage associ 20 and means effective at a predetermined rate of
ated therewith, a quenching head,'said inductor _ coolant ?ow through said passage to cause said
heat-treating position.
>
opening and closing means to close said circuit
and quenching head being relatively movable into
and out of a position ofv adjacent relationship, ' - and e?ective at a rate of vcoolant flow less than
said predetermined rate. to open said circuit.
means for e?ecting said relative , movement,
means for supplying electrical energy to said in
' ductor to energize the same, means for supplying
25'
.nowARp E. SOMES.
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