Improved Friction Coupling for the Carbon Feed Mechanism of Electric Arc Lamps.
Year: 1893

page_text: Improved Friction Coupling for the Carbon Feed Mechanism of
Electric Arc Lamps.
I, JOSEPH JERGLE, of No. 37 Mariahilfer Strasse, in the City of Vienna, in
the Empire of Austria, Inventor do hereby declare the nature of this invention
and in what manner. the same is to be. performed, to be particularly described and
ascertained in and by the following statement:-
This invention relates to an improved friction, coupling for the carbon feed
mechanism of electric arc lamps the object of which is to retain the tips of the
carbons of electric arc lamps at a uniform distance from each other so long as the
carbons are being operated for producing electric light or in other words to regulate
the position of the one carbon to the other.
No alteration in the construction of the existing arc lamps is requisite for
applying my invention to the same it being immaterial whether the current
employed is uniform or alternating....
The accompanying drawings represent the upper part of an are lamp with the
carbon feed mechanism,
Fig. 1 being a top view or plan,
Fig. 2 an elevation partly in section.
Fig. 3 & 4 represent details.of.the improved device..
The armaturea is attracted by the appropriately arranged shunt electro magnet s, n
as soon as the distance between the two carbons, in consequence of their
combustion has been so increased that the resistance between the same has become
so great that the electro magnet s, n in the derived circuit lll between the two
terminals kk2, is excited.
This attraction is continued until the derived current is interrupted by breaking
the contact at c whereupon the spring f of the armature a returns to its position
of rest.
The armatur a is rigidly attached to the piece of metal m, arranged loosely on
the disc t and embracing the rotary bolt or spindle b, so that the same is pressed by
means of a screw nut i with sufficient force onto the disc t in order that when the
hindrance is not excessive the disc t and with it the rotary spindle b will be caused
to follow the movement of the armature.
A recess on the interior side of the piece of metal m (Fig. 3 & 4) forms in
combination with the periphery of the disc t a slightly conical space into which a
frictional body (disc roller ball or their equivalent, is so pressed by a spring f that
the said body is simultaneously in contact with the surface of the recess x in the
piece of metal m and the periphery of the disc t.
A like frictional body is arranged in corresponding manner and is pressed by a
spring into contact with the disc t and a piece of metal m.
The lower part g of the rotary spindle of the disc t is provided with screw threads
of desired pitch and can turn free in a slotted shell d.
The carrier of the carbon holder n glides on the said shell d and a second shell or
case and carries an open nut z arranged on a suitable spring, said nut gearing
into the threads of the spindle g and can when withdrawn by means of the handle g
glide free on the said spindle g and can be thus readily drawn down and fixed at
any desired point.
The operation of the device is as follows:-
Every time the armature a is attracted by the electro-magnet s, n in the derived
circuit ; the disc t has the tendency to turn and follow the movement of the
armature a but is prevented from doing so by the friction caused by the friction
body r
The armature a 18 attracted by the appropriately arranged shunt electro magnets, n
as soon as the distance between the two carbons, in consequence of their
combustion has been so increased that the resistance between the same has become
so great that the electro magnet s, n in the derived circuit Ill between the two
terminals kk², is excited.
This attraction is continued until the derived current is interrupted by breaking
the contact at c whereupon the spring f of the armature a returns to its position
of rest.
The armatur a is rigidly attached to the piece of metal m, arranged loosely on
the disc t and embracing the rotary bolt or spindle b, so that the same is pressed by
means of a screw nut i with sufficient force onto the disc t in order that when the
hindrance is not excessive the disc t and with it the rotary spindle b will be caused
to follow the movement of the armature.
A recess x on the interior side of the piece of metal m (Fig. 3 & 4) forms in
combination with the periphery of the disc t a slightly conical space into which a
frictional body (disc roller ball or their equivalent, is so pressed by a spring f that
the said body is simultaneously in contact with the surface of the recess & in the
piece of metal m and the periphery of the disc t.
A like frictional body is arranged in corresponding manner and is pressed by a
spring into contact with the disc t and a piece of metal m.
The lower part g of the rotary spindle of the disc t is provided with screw threads
of desired pitch and can turn free in a slotted shell d.
The carrier of the carbon holder n glides on the said shell d and a second shell or
case d¹ and carries an open nut z arranged on a suitable spring, said nut gearing
into the threads of the spindle g and can when withdrawn by means of the handle g
glide free on the said spindle g and can be thus readily drawn down and fixed at
any desired point.
The operation of the device is as follows:-
Every time the armature a is attracted by the electro-magnet s, n in the derived
circuit ; the disc t has the tendency to turn and follow the movement of the
armature a but is prevented from doing so by the friction caused by the friction
body r

page_text: If the derived current is interrupted by breaking the contact at c and the
armature a brought out of its position of rest by the spring f, the frictional
contact of the roller r with the disc t will cause the latter and also the rotary
bolt and threated spindle g to rotate and thus effect the movement of the nut
and the carbon carrier n a distance downwards, corresponding to the rotation of the
said spindle g.
The object of the frictional body is to prevent all retrograde rotation of the
spindle g when the armature a is attracted.
Having now particularly described and ascertained the nature of my said
invention and the manner in which the same is to be performed, I-declare- that
what I claim is:
An improved friction coupling for the carbon feed mechanism of electric arc
lamps characterised by the combination with a cross-head carrying the positive
carbon of a vertical screw threaded rod engaging an open nut on the cross-head, a
horizontal disk on the upper end of the rod actuated by a step-by-step feed
consisting of an armature lever pivoted on the rod, a shunt magnet parallel to the
lever and a pair of roller clutches each of which under the action of the shunt
magnet and its armature is adapted to alternately engage and disengage the disk
to rotate it, substantially as de cribed and shown in the drawings.
..
Dated this 3rd day of February 1893.
HORN & SON,
Applicant's Agents.