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Патент USA US2132110

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Oct. 4, 1938.
Filed Dec. 1'7, 1935
2 Sheets-‘Sheet 1
91-34 '
wall ?ake’ +
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Oct. 4,1938. f
"Filed Dec. 17, 1935
’ v2 Sheets-Sheet 2
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Patentedoct. 4, 1938,- .
PATENT ‘ omen
' 2,132,110
Hermann' Holler, Frankfort-on-the-Main, Ger
many,‘ assignor to I. G. Farbenindustrie Ak
tiengesellschaft, Frankfort-on-the-Main, .Ger
Application December 17,1935, Serial No. 54,923
' In Germany December 29, 1934
2 Claims.
The present invention relates to an appara
tus for surface hardening metal articles.
Surface hardening of metal articles by means
of the blow pipe ?ame has been carried outby
5 means of apparatus by which the burner is posi
tively driven in a suitable manner over the arti
cle to be hardened. This method of hardening
has also been carried out 'by apparatuswhich
automatically applies the burner to the article
10 at the beginning of its movement and removes
it when this movement is ?nished.
For hardening numerous articles, however, it
is necessary to move the burner'over the article
at variable speeds, the speed in each case being
15 determined in accordance with the degree of
hardness desired. Especially is- this done when
hardening toothed wheels. In this application the
burnermust, when placed overthe tooth to be
hardened, remain in this position until the rela
20 tively cold tooth is heated sumciently. When this
heating is ?nished the burner may be moved over
the tooth ?ank but its velocity must be accel
erated as it approaches the end of the tooth in
order that overheating of this part of the toothed
25 wheel is avoided.
When surface hardening bevel wheels, for ex
ample, where the thickness of the tooth is not
constant along its width, the requirements with
regard to the burner speed are more difficult
30 to meet.
An object of the present invention is to pro
vide a device which permits the velocity of
the burner to be adjusted to suit a particular
My invention is practiced by moving the burner
over the article to be hardened while auto
matically controlling its motion and driving it
by operation of a driving member to which is
imparted an always constant speed of rota
40 tion.
The necessary adjustment of the velocity
(Cl; 266-5)
mechanism of the arrangement shown. inFigs.
1 ,to
Referring to the drawings, a frame I carries
a ‘carriage 2 vwhich can be. adjusted to a de
siredv position on the frame and which supports
the latter carriage anrarrn 4 is slidably mounted
on rollers I5 in a guideway ‘i6 for reciprocating '
movement in- a direction transversely of the
movement of the‘burner carriage‘ 3. The arm is
held in the guideway l6 by guide-rails II. ‘The
arm 4 isymoved by awheel 5 which is driven
by va motor i3, as more distinctly shown in Fig. 4-,
and which is ‘constrained by means of a solenoid
I2 situated in a casing, to follow' the path ‘of 15
a ?xed cam plate 6, the shape of Whichis de
termined according'to the particular require
ments imposed by an ‘article to1be hardened.
The wheel 5 is driven withaconstant velocity.
When, for example, a normal toothed wheel
shown in Figs. 1, and 2 is to be hardened the
burneris, at the commencement‘ of the harden
ing process, positioned adjacent the left top edge
of a wheel tooth. The 'whee15 ‘at this moment
is at the left rear corner ill of the cam platev 6.
Wheel 5 now runs forwardly,‘ i.‘ e. towards the
toothed wheel on the plate as indicated by an
arrow in Fig. 2. As the arm 4 which carries
the Wheel 5 is slidably arranged in the burner
carriage 3, the burner, which is ?xed to its
carriage, is not moved during the forward move
ment of the wheel 5. As soon as the wheel 5
rounds the left front corner of the plate 6 it
moves to the right as shown by the arrow in Fig.
2 at a constant velocity and thereby moves the
burner to the right over the wheel tooth until
the edge is reached. At the end of this movement
the wheel 5 rounds the right front corner of the
plate 6 and returns to its initial position by mov
ing over the hypotenuse of the triangular cam
of the moving burner is accomplished by posi
tively changing the direction of movement of the
driving member, and by transmitting the e?ect
plate 6 in the direction indicated by the inclined
of this change to the moving burner through a
brought away from the action of the cam plate
6 in a manner more distinctly de?ned below
45 sliding arm between the driving member and
the burner carriage.
The invention is illustrated by way of example
in the accompanying drawings in which
Fig. 1 is an elevation,
Fig. 2 a plan, and
Fig. 3 illustrates diagrammatically a bevel wheel
to be hardened, while
Fig. 3a. illustrates the cam plate used when
hardening the bevel gear of Fig. 3,
55 Figs. 4 and 5 illustrate details of the drive
for movements thereon a burner carriage 3. ‘ In
arrow in Fig. 2.
For this purpose the driving
wheel 5 is, when the heating has been ?nished,
and the burner carriage 3 is drawn back into
its initial positionwith an elevated velocity by
means of a weight ll.
When, instead of a normal toothed wheel a
bevel wheel, as shown in Fig. 3, is to be hardened, 50
a ?xed cam plate of the shape shown at m in
Fig. 3a is used; In this case the speed of the
burner as it moves along a tooth is not constant
but varies according to the kind of toothed wheel
as can be seen from the shape of_ the plate at m.
. Otherwise the remaining features of the appara
tus are the. same. As illustrated in Figs. 1 to 3,
the toothed wheel to be hardened is placed on an
axis .which'rests on two bearings.
When the hardening process‘ is being carried
out thevcarriage I which supports the burner‘
carriage'l ‘is clamped to the frame I' by any suit
able known means.
The contact of the wheel I with the surface
of the ?xed'cam plate I as it moves on the latter
can be secured by a magnetic device. The wheel
5 may. for example, vbe kept magnetized by a
solenoid i2 situated above it and carried on the
arm 4.
The wheel will thus be constrained to
.15 remain in. contact with the cam plate by magnetic
A quick return movement'of the burner may be
effected bylprovlding a second cam plate and
arranging it to be traversed by an idle running
20 wheel which is driven by a weight.‘
Figure 4 illustrates on an enlarged scale a side
view of the rear part of the connecting arm 4
shown in Figure 2 on which the magnetized wheel
5 is situated, the solenoid i2 being mounted above
the wheel 5 which is driven with constant veloc
ity by means'of a motor II. A bent angle iron
9 carries thev cam plate I. Above the cam. plate
6 there is mounted a'further cam plate I which,
in connection with the. idle running ‘wheel ‘I
effects the quick return of the burner carriage I.
As shown in Figures 4 and.5, the camplates
O and I are fastened by a flat iron or an angle
iron to the carriage 2 which is illustrated com-v
pletely in Figures 1 and 2.
I claim:
1. Apparatus for heating metal articles, par
ticularly toothed wheels .by means of the blow
pipe ?ame for the purposeiof subsequent harden
ing, which comprises a burner carriage movable ,
parallel to the surface to be heated, an arm‘, 10
slidably mounted on the‘ carriage and movable;
towards and from the article, a ?xed cam plate,
and a‘ driving wheelcarried on the arm, means
for rotating said driving wheel with a constant
velocity, a magnetic device connected with the 15
wheel in such a manner as to constrain the driv
ing ‘wheel to follow the cam contour, and thereby
to move the burner vparallel to the surface to be
heated at a velocity determined by the shape '
of the cam plate.
. 2. Apparatus for heating metal articles, par
ticularly toothed wheels. by means of the blow
pipe ?ame for the purpose of subsequent harden
ing, which comprises a burner?c'arriage movable
parallel to the surface to be heated; an arm 25
slldably mounted on the carriage and movable
towards and from the'article, 'a‘ ?xed cam plate,
and adriving wheel carried onthe arm, means
for.‘ rotating said driving wheel with a: con
stant velocity, va magnetic device connected with
the wheel'in such a manner as to constrain the
driving wheel to follow the ‘cam contour, and
Figure 5 illustrates on an enlarged scale a plan
view of the two cam platesl'a'nd I and the
holding device 9.‘ The cam plate ‘In is formed in thereby to move the burner parallel to the sur
such a manner that,-when the burnercarriage '3 face to be heated at a velocity determined by
moves to the right, the idle‘ running wheel ‘I does the shape of‘said cam plate, a second fixed-cam
not come. in contact with the cam plate 8. At platenan idle running wheel, also carried on said 35
the beginning of the return movement, vthe idle arm and adapted to follow the contour of said‘
‘running wheel ‘I contacts against the cam plate second
fixed cam plate for a portion of .the peri
.8 and removes, thereby the magnet roll I from phery of the latter corresponding to the, return
the cam plate 6. .By the action of the weight movement of the 'arm, whereby to move the
II, the burner» carriage I now "returns into its driving wheel out offlxed relation with said ?rst 40
initial position with an accelerated velocity, the ?xed
plate, during such return movement,
idle running wheel 1 running along the inclined and a cam
driving weight adapted to actuate said idle
edge of the cam plate I. As soon as the wheel ‘I
has reached the corner II, the magnet wheel I
again comes into contact with the cam plate I
and the further motion is now again performed
by the driving motor i3.
running wheelwhereby to move the latter along
said portion of the periphery of said second ?xed
cam plate providing a quick return motion of
said arm.
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