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Патент USA US2136082

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Nov. 8, 1938.
w. K. KRIEG ET AL
2,136,082.
ELECTRODE FEEDING MECHANISM FOR ARC LAMPS
Filed Jan. 22, 1938
h.___._____
Fig. 1
2 Sheets-Sheet l
NOV. 8, 1938.
w_ K_ KRlEG ET AL
2,136,082
ELECTRODE FEEDING MECHANISM FOR ARC LAMPS
Filed Jan. 22, 1938
2 Sheets-Sheet 2
[/2 van ions.
WM” _ 5117/
2,136,082
Patented Nov. 8, 1938 _
UNITED STATES
PATENT OFFICE '
2,138,082
‘ ELECTRODE FEEDING
LAMPS
MECHANISM FOR
.
a
'
Walter Kurt Krieg and Ernst Scheller, Jena, Ger
assignors to the llnn Carl Zelas, Jena,
many,
Germany
_ Application January 22, 1938, Serial No. 186,376
In Germany January 27. 193'!
5 Claims. (Cl. 176-55)
This
invention
concerns
electrode ‘ feeding
mechanisms which impart to an electrode of an
arc lamp not only a movement along but also a
rotation about the axis of same.
An especially simple and suitable mechanism
of this kind is provided by the present invention,
according to which the electrode is in?uenced by
a surrounding annular wheel rotatable about an
axis intersecting the electrode axis at an acute
/'
it) angle.
A mechanism of said kind is, owing to simple‘
construction, very reliable and can be'compara
tively small, so that the electrode head intercepts
the light are to a comparatively small extent
only. To ensure as reliable an electrode displace
Figure 4). The rod h is mountedon the holder 11'
in. such a manner as to be displaceable along and
rotatable about its axis. By means of an am i
fixed to therod h and carrying a square rod i1
lying between two adjusting screws 11 and F in
the arm I, the position oi.’ the rod It can ‘be deter
mined with respect to the arm I by slightly screw
ing back the one of the screws 1'1 and I‘ and re
adjusting the other of these screws until the pm
i1 is in contact with both screws. A spring 1', 10
which acts'against the upper bearing of the rod
h and against a collar it2 fast with this' rod, draws
this rod downward. Against the lower side of the
collar h’. liesvthe one end of a fork k rotatable
about a pin k1, the other end of this fork being
provided with a key k’. Below this key It2 is a
ment as possible, the interior wheel surface ac- 4 stop k3 resting on a support It‘ on which the fork
tuating the electrode is conveniently provided
is is mounted. On the lower end of the rod h is
with pins or teeth of hard material.
?xed
the double-armed armature l1 of an electro
In a mechanism according to the‘invention, magnet
l. The one end of the armature l1 is fast
various speeds can be obtained by providing that with a spring
12 endeavouring to press the other
the inclination of the axis of rotation of the end of this armature on a stop 13 against the ac
driving wheel withrespect to the electrode axis tion of the electromagnet. This electromagnet is
be varied. It is thus possible to control for in
‘stance the feeding speed according to ‘different
electrode materials. When the inclination of the
two axes relative to each other is variable by
means of an electromagnet controlled by the
light-arc voltage or actuated by means of a ther
mostat, irregularities in the electrode material
can be dealt with in the feed automatically.
The acompanying drawings illustrate a con
structional example of the invention. Figure 1
shows in part-sectional view the entire mecha
nism; Figure 2 shows a section through line 2-4
operative only when the contact of a thermostat
m is closed, on which the luminous crater of the 25
electrode a is imaged when this electrode assumes
a definite position.
_
-
‘The above-described mechanism operates as
follows:
'
For the introduction of the electrode into the 30
holder b, the key It2 is to be pressed down, so that
the driving wheel 0 is slightly raised against the
action of the spring 7'. The hollow space in the
wheel c thus assumes a central position with re- ,
to the axis B-B of the elctrode a, and the
A in Figure 1; Figure 3 is a partial diagram; Figure. spect
electrode
can be inserted through this space.
a:
4 shows a section through line 4-4 in Figure 1;
When the key k2 is then released (as is shown in
Figure 5'shows a section through line 5-—5 m the
drawings), the driving wheel c assumes the
Figure 1; and Figure 6 is the diagram‘ of a single
position eccentric to the electrode axis, and the
points of the upper screws 01 lie against the elec 40
In thisconstructional example, the electrode, trode. Energizing the‘ motor 9‘ causes the driving
designated a, is in a holder b. The electrode it
wheel 0 to rotate and the upper screws 01 to carry
passes through a central ori?ce in an annular
wheel, 0 into which protrude the points of steel the electrode along. On account of the inclina-‘
screws 01, these points engaging the electrode a. tion oi! the axis A—A to the electrode axis 18-13 45
(of. Figure 3)., the screw points in engagement
I
part.
_
_
.
_ The wheel 0, which is mounted in a ball bearing 11
and rotatable about an axis A-A, has teeth V02 in
mesh with a bevel wheel e. The wheel e is mount
ed in.an arm I, which carries the ball bearing d.
By means of a ?exible shaft e1 and a pair of bevel
to
wheels e2, es, the wheel‘ e is connected to the
armature of an electromotor g. A rod 7!. extends
into the arm 1‘ and is so ?xed to same by a screw
111 that this arm is not displaceable in the direc
tion of the axis of this rod but can, within cer
tain limits. eifect rotations about this axis (of.
with the electrode push this electrode'forward,
which is due to the electrode effecting a screw
motion. The desired inclination of the axis A—-A
relative to the axis B—I_B and, consequently, the
desired feed of the electrode per rotation can be
adjusted by means of the screws {1 and I’. Un
foreseen changes in the consumption of the elec
trode are dealt with automatically by operation
of the electromagnet I through the agency of the
thermostat m.
'
2
We claim:
2,186,082
'
~.
1. In an arc lamp, a holder for an electrode, a
feeding mechanism for said electrode, said feed
ing mechanism having an annular wheel provided
with a central ori?ce through which the electrode
passes and for feeding said electrode through
said holder, said annular wheel being mounted
'on said holder and rotatable about an axis cross
10.
ing the axis of said electrode at anacuteang'le
and thus imparting screw motions to said'elec
4. ‘In ‘an arc lamp, a holder for an electrode, a ,
feeding mechanism for said electrode, said feed:
ing mechanism having an annular wheel provided
with a central ori?ce through which the electrode
passes and feeding said-electrode through said
holder, the axis of said annular wheel being ec
centric to the axis of said electrode, a bearing
body for said annular wheel being mounted on
said electrode holder and rotatable about an axis '
intersecting the axis of rotation of said annular
trode when said annular wheel is rotated; '
wheel at right angles, so that the rotation of said
2. In an arc lamp, a holder for an electrode; a ‘ bearing body ‘alters the angle of inclination at
feeding mechanism -for' said'electrode, said feed
which'the axis of rotation of said' annular wheel
ing mechanism having an annular wheel provided crosses the axis of said electrode,'and an arc
with a centralori?ce through which the electrode controlledvmeans for rotating said bearing body
passes, said annular wheel having pins protruding relatively to said- electrode holder.
'
from the interior surface of same and ‘engaging
said electrode, said annular wheel being mounted
5. In an~arc lamp, .a holder for an electrode, a I
on said holder and rotatable about an axis cross
feeding mechanism forsaid electrode, said feed
ing mechanism having an annular wheel provided
ing the axis of said electrode at an acute angle
with a central ori?ce through which the electrode
, and thus imparting screw motions to said eIec-‘ passes and feeding said electrode through said
, trode when said annular wheel is rotated.
' holder, the axis of said annular wheel being .ec
l
3. In an arc lamp, a holder for an electrode, a
centric to theaxis of said electrode, a bearing
feeding mechanism for said electrode, said feed
body for said annular wheel being mounted on
Ll ing mechanism having an annular wheel‘ pro ' said electrode holder and rotatable‘ about an axis
vided with a central ori?ce through which the inte'rsecting the axis ‘of rotation-of said annular
electrode passes and feeding said ‘electrode. wheel at right, angles, so'that the rotation of
through said holder, the axis of said annular . -said bearing body alters the-angle of inclination
wheel being eccentric to the axis of said electrode, at which‘ the axis-of rotation of said annular
a bearing body for said annular wheel being wheel crosses the axis of said electrode, an elec
mounted on said electrode holder and rotatable tromagnet for,v rotating said bearing body rela
about an axis intersecting the axis of rotation of , tively to" said electrode holder, and a thermostat
said annular wheel at right angles, so that the positioned to receive light from the arc of ‘the lamp
rotation of said bearing‘ body alters the angle of ' . and electrically connected to- said: electromagnet
inclination at which the‘ axis of rotation of said.
for controlling same. ‘
35,
‘annular wheel.crosses the axis of said electrode,
and means for rotating said bearing body rela.- '
tively to said electrode holder.
- WALTER KURT- mime.
ERNST SCl-IELLER.
-
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