Improvements in Electric Are Lamps.
Year: 1893

page_text: Date of Application, 15th Aug., 1893
Complete Specification Left, 27th Apr., 1894-Accepted, 2nd June, 1894
PROVISIONAL SPECIFICATION.
Improvements in Electric Are Lamps.
I, JAMES BROCKIE, of Fairview, Tyson Road, Forest Hill, in the County of
Kent, Engineer, do hereby declare the nature of this invention to be as follows:-
In my Specification No. 4419 of 1882 I described regulating mechanism of an
electric arc lamp wherein a wheel connected by pinion and rack to the upper carbon
holder was acted on by a pawl lever connected to the core of a solenoid. According
to one of my present improvements, I fix on the pawl lever a spring faced with soft
material which bears on the edge of the wheel so as to act as a brake when the
wheel is released by the pawl, and thus to make the feed of the carbon gradual.
According to another improvement, I provide the wheel with ratchet teeth in
which the pawl engages, and I counterbalance the pawl lever so that the pawl
always tends to ascend when the strain of the carbon is not upon it. Thus, when
the pawl is released on reaching a fixed stop, it is only for a moment, as it
immediately ascends and catches the next tooth of the ratchet wheel.
In both cases, I may electrically connect to the pawl lever one of the terminals
of the lamp, and fix on the lever a rubber bearing on the spindle of the wheel or
a boss thereof, electricity being thus communicated to one of the carbons.
By suitably insulated bosses on the spindle when it carries pulleys with conducting
cords or chains to both carbons, electricity may be thus conveyed to both.
Instead of providing the wheel with ratchet teeth, I may apply to it a pawl of the
nature of a silent feed, for which purpose I form in the face of the wheel an annular
groove and in this are engaged two studs projecting from the side of the pawl lever,
so that on the canting of the lever in the one direction they engage the wheel, but
on its canting in the opposite direction they release it.
Dated this 15th day of August 1893.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Electric Arc Lamps.
I, JAMES BROCKIE, of Fairview, Tyson Road, Forest Hill, in the County of
Kent, Engineer, 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 my Specification No. 4419 of 1882 I described regulating mechanism of an
electric arc lamp, wherein a wheel connected by pinion and rack to the upper carbon
holder was acted on by a pawl lever connected to the core of a solenoid.
According to my present invention as shewn in elevation by Fig. 1 of the
accompanying drawings, I fix on the pawl lever A a spring B preferably faced with
soft material which bears on the edge or rim of the wheel C so as to act as a brake
when the wheel is released by the pawl E, and thus to render the movement of the
carbon gradual. The lever A is made heavy at the end which carries the pawl or
is strained by a spring F as shown, in order that the pawl E may grip the brake
wheel C with sufficient force to turn it when the pawl lever is lifted by the core L
of the solenoid G off the stop J.
As shewn in Fig. 2, I make the wheel C with ratchet teeth, with which the pawl E
LD 037

page_text: engages, and I counterweight the pawl lever by a weight K (for which a spring may
be substituted) so that the pawl E always tends to ascend when the turning strain
of the wheel is not upon it.
Thus, when the pawl E is released by its tail coming to bear on the stop J, this
is only for a moment as it immediately ascends and catches the next tooth of the
ratchet wheel; in order that this movement may take place the lever A is not
pivotted to the solenoid core L, but is engaged in a slot M which allows the pawl
fever a little freedom of movement. Sudden movement of the brake wheel when
the pawl is momentarily disengaged from it may be prevented by a spring or
weighted brake as described with reference to Fig. 1 or by any known retarding
device.
Although I have described the brake wheel as being driven by a rack gearing
with a pinion on the spindle of the wheel, it is obvious that the arrangements above
described may be applied to brake wheels and their spindles driven directly by a
cord, chain, or band attached to the carbon holders as shewn in Fig. 3 which is an
elevation and Fig. 4 which is a plan. In this case, I may electrically connect to
the pawl lever A a suitable flexible conductor to one of the lamp terminals and fix
on the lever a rubber or metallic brush R bearing on the spindle S or a boss on the
spindle, of the wheel C, current being thus conveyed to one of the carbons by the
metallic tape or band which passes over the brake wheel C, and is attached to one
of the carbon holders.
When the spindle carries pulleys W'W' with conducting cords or chains to both
carbons, current may be thus conveyed to both carbons. As shewn in Fig. 4 the
two pulleys are electrically insulated from each other, the pulley W' carrying the
cord attached to the upper carbon holder, and the pulley W carrying the cord
attached to the lower.
The pulley W is connected electrically to the lamp through the spindle S the
brush R and lever A whilst the pulley W2 is connected through the spring
contacts X X and wire helix V to the negative terminal, the rubbers X X being
carried by an arm Z electrically insulated from the lever A.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. In combination with the wheel connected by rack or band to the carbon
holder of an electric arc lamp and the pawl lever caused to act thereon by
a regulating solenoid, an arm carrying a spring brake, substantially as and for the
purpose set forth in reference to Fig. 1.
2. In combination with the wheel above referred to, a pawl lever counterweighted
and connected to the core of the regulating solenoid with limited freedom of
movement, substantially as described with reference to Fig. 2.
3. For conveying current to and from the conducting bands carrying the carbon
holders of an electric arc lamp, the arrangement of brushes connected to the
regulating lever, substantially as described with reference to Figs. 3 and 4.
Dated this 27th day of April 1894.
ABEL & IMRAY,
Agents for the Applicant.