An Improvement in Electric Aro Lamps.
Year: 1892

page_text: Date of Application, 12th Apr., 1892
Complete Specification Left, 5th Jan., 1893-Accepted, 18th Feb., 1893
PROVISIONAL SPECIFICATION.
An Improvement in Electric Aro Lamps.
I, REGINALD BELFIELD of No. 4 Victoria Mansions, Victoria Street, West-
minster in the County of London, Electrician, do hereby declare the nature of this
invention to be as follows:-
In electric arc lamps in which one of the carbons is connected to the core of a
Bolenoid so that it is caused to move towards or away from the other carbon
according as the current exciting the solenoid varies, the motion is apt to be rapid
and sudden causing objectionable variations of the light. In order to provide
against these sudden movements dash pots are ordinarily employed but these are in
some respects objectionable. My invention relates to means of preventing these
sudden movements of the carbon which I effect in the following manner. I connect
by suitable gearing to the carbon or its motor an escapement wheel arranged to act
on a pair of anchors, to which is attached a small pendulum. When the carbon is
moved by the action of the solenoid the escapement wheel is caused to turn
through part of a revolution, causing the pendulum to swing to and fro. As the
rate at which it swings is determined in great measure by its length, it does not
allow such sudden movements of the carbon as have any objectionable effect on the
light.
Dated thin 10th day of Amil 1909
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Electric Arc Lamps.
1, REGINALD BELFIELD of No. 4 Victoria Mansions, Victoria Street, West-
minster in the County of London, Electrician 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 :—
In electric arc lamps in which one of the carbons is connected to the core of a
solenoid or to mechanism controlled by the core so that it is caused to move
towards or away from the other carbon according as the current exciting the
solenoid varies, the motion is apt to be rapid and sudden causing objectionable
variations of the light.
In order to provide against these sudden movements, dash pots are ordinarily
employed, but these are in some respects objectionable. My invention relates to
means of preventing these sudden movements of the carbon, which I effect as I
shall describe referring to the accompanying drawings. Figs. 1 and 2 which
represent respectively front and side views of regulating mechanism for an electric
arc lamp, to which this invention is applied. A is the rod to the lower end of
which the upper carbon is attached. This rod is made with rack teeth gearing
with a pinion B from which by multiplying gear is driven a brake wheel C having
several projecting teeth. The axes of the pinion B and of the brake wheel C
are mounted in bearings in a framing D which is pivotted at d to a lever E. The
lever E which is pivotted at e carries at its one end the core F of a solenoid G
the coil of which is in the lamp circuit. The core F is partly counterpoised by a
weight at the opposite end of the lever E. Standing up from the lever E and
fixed to it is a toothed segment H gearing with a pinion on the axis of which is a
serrated escapement wheel K, with which engages the one or the other of two
CD

page_text: teeth projecting inwards in a round hole formed in a triangularly shaped
pendulum L which is pivotted at 1. As the core Fascends or descends, according
as the attractive power of the solenoid G varies, its segment H causes the pinion h
and escapement wheel K to revolve and the pendulum L to oscillate, the speed
being controlled by the rate of oscillation of the pendulum.
When the core F ascends at a rate thus governed, it raises the frame D and with
it the brake wheel C, which is caused to revolve by the pinion B running along the
rack of A. As the wheel C is raised it raises a brake lever P which rubs on its
periphery and tends to retard it, and ultimately the teeth of C encounter a pin m
projecting from the side of a pawl lever M which, as well as the lever P, is pivotted
to the fixed framing at N. The wheel C is thus stopped and the rod A
is held until, by a partial descent of the core F, due to the increased
resistance of the arc as the carbons are consumed, the tooth of the wheel C
is released from the stop m and the rod A is allowed to descend a little feeding
the carbon. The teeth of C are roundly sloped on the rear side so that when in
trimming the lamp the rod A is pushed up by hand, they can escape the stop m
lifting it with the pawl lever M from which it projects.
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 :
In combination with the solenoid core which regulates the movement of the
carbon of an electric arc lamp, an escapement wheel and pendulum adapted to
control the movements of the core, substantially as and for the purposes set forth.
Dated this 5th day of January 1893.
ABEL & IMRAY,
Agents for the Applicant.