Improvement in Electric Arc Lamps.
Year: 1892

page_text: Date of Application, 4th May, 1892-Accepted, 18th June, 1892
COMPLETE DIECIFICATION.
Improvement in Electric Arc Lamps.
I, CARL COERPER, of Ehrenfeld near Cologne, in the Empire of Germany,
do hereby declare the nature of this invention ard in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement :-
In arc lamps for electric lighting I employ the mechanism hereinafter described.
Upon the fixed bracket a is supported a clockwork train adapted to turn upon
the axis b. This clockwork is held by the spring n or by a suitable weight in a
definite position until a more powerful action causes a change in the position. The
running of the clockwork train is determined by the movement of the brake disc c
which is held or released by the brake lever d. The said brake lever d is arranged
the frame of the clockwork, being adapted to turn upon the axis
upon
and when
the whole of the clockwork train is moved round the axis b the end of the lever is
forced against the stop screw for raised from the same so that in certain positions
of the clockwork frame the brake lever d releases the brake disc c.
e,
On the base plate k are fixed two solenoids or electromagnets g and the
magnetic attraction of which is transmitted to the lever i. The lever i is adapted
to turn upon an axis at 7 and is connected by means of a draw rod or cord with the
frame of the clockwork at the point m. The winding of the coil y is carried out
so as to be placed in a shunt circuit, while the coil his wound for the main
circuit.
The action of the mechanism is as follows:
In the position of rest the carbons of the arc lamp, which are suspended from
cords o and p passing over the cord pulley q, touch each other. When the current
passes through the lamp no current passes round the coil g, because the carbons
short-circuit the conductor; whilst the main circuit coil h receives so much current
that the core or armature is powerfully attracted. The movement of the lever i
thereby produced causes an upward movement of the clockwork frame, and as at
the same time the brake lever d is removed from the stop screw the wheels cannot
rotate. At the same time the cord pulley 4 turns with the clockwork and thereby
moves the carbons apart, that is to say the are is produced.
When the arc becomes too long the shunt circuit coil by reason of the
increased resistance in the arc circuit, receives so much current that the lever i
will be drawn towards g, so that the clockwork descend until the brake lever d
strikes against the stop screw f. By this means the brake disc c is released, the.
wheels turn and the carbons move towards each other until the proper length of the
arc has been re-established.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
A mechanism for arc lamps arranged upon a plate k and adapted to turn upon a
fixed axis in such a manner that it is controlled in its motion by two solenoids or
electromagnets (one coil of which is in the main circuit and the other coil in the
shunt circuit) fixed upon the same plate, for the purpose of moving the carbons
asunder by means of the main circuit coil h, whilst the shunt circuit coil
the length of the are is too great, causes the lamp mechanism to be drawn down-
wards until the brake lever d, pressed against a fixed stop, releases the brake disc c
when

page_text: and thus admits of the approach of the carbons till the proper length of the arc is
established.
Dated this 4th day of May 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.