Improvements in Electric Arc Lamps.
Year: 1891

page_text: Date of Application, 2nd June, 1891
Complete Specification Left, 29th Feb., 1892-Accepted, 16th Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in Electric Arc Lamps.
I, ALBERT EDWIN BISHOP of 10 Victoria Terrace, Stoneclough near Bolton in
the County of Lancaster, Electrical Engineer, do hereby declare the nature of
my said invention to be as follows:-
וח
This invention relates to improvements in electric are lamps and has for its
object that of increasing the efficiency of the same and simplifying their con-
struction, and consists in providing a metal beam of an improved form in one
piece with an oblong or other opening in the centre to allow of its being slid
on an inverted tube, with enough play for it to turn on its centre through the
requisite angle. Each end of the metal beam is forked to receive cores
plungers, and allows them to operate in the series and shunt solenoids. The
metal beam is secured to the inverted tube and the cores or plungers to the
ends of same by means of adjustable centres or pivots secured by lock nuts or
The
their equivalents to prevent sticking and reduce friction to a minimum.
metal beam is furnished with mechanism for making and feeding the electric
arc, and for rendering the safety cut-out of the lamp automatic. For regulating
the length of arc and adjusting time of feed I attach to a lug on the side of
the beam an adjusting screw coupled to a spring and strap. The latter passes
round or under a pulley and is connected by a chain or its equivalent and a
screw to a fixed lug on the aforesaid metal beam. The object of the spring is
to allow of the strap being drawn or tightened after it has bound round the
pulley it works in connection with to turn a pinion which operates in the rack
on the centre rod to part the carbons, and by which it is held until the carbons
require feeding. When the latter operation is necessary the strap releases the
pulley and pinion and allows the rack rod to feed the upper carbon by gravity.
After the carbon has been automatically fed into the requisite position the strap
again binds on the pulley, and if the carbon has dropped too low it will be
operated by the metal beam to raise the rack rod and re-adjust the are to its
proper length. For the purpose of cutting. the lamp out of circuit, when the
current in the shunt solenoid exceeds a certain limit, I employ a spring and
adjusting screw coupled with the metal beam and the inverted tube, and to the
other side of the beam I attach an adjustable rod mounted in guides to operate
on the contact mechanism by means of a lever or levers or otherwise. The
automatic cut-out mounted on an insulated block consists of a contact-block,
contact maker, spring, and handle. Suitable arrangements are provided for
regulating the light and switching the lamp out by hand.
Dated the 1st June 1891.
EDMUND CHADWICK,
Agent.
COMPLETE SPECIFICATION.
Improvements in Electric Arc Lamps.
I, ALBERT EDWIN BISHOP of 10 Victoria Terrace, Stoneclough near Bolton in
the County of Lancaster, Electrical Engineer, do hereby declare the nature of my
said 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 improvements in electric arc lamps and has for its

page_text: fixed the metallic tube I which is employed for hanging or carrying the lamp.
To the under side of the crosspicce H is fixed the metallic cylinder into
which slides the rack rod K. The latter rod is constructed to carry at its
lower end the upper carbon. On the outside of the metallic cylinder J is
mounted the metallic bean E by means of the screwed pivots 9 and lock nuts 10.
The centre of the metallic beam E is constructed with the oblong or other
opening sufficiently long to allow it to turn or oscillate on the pivots 9
according to the requirements of the lamp. The metallic beam E is constructed
with forked or open ends fitted with the screwed pivots 11; the latter securing
the metallic cores or plungers D which work in the solenoids B and C. For
regulating the length of arc on the lamp first striking up the series solenoid
side or end of the metallic beam E is fitted with the lug 12 in which is mounted
the adjusting screw 13. To one end of this screw is attached the spring 14 and
strap or brake band 15 the latter passing round or under the pulley M to the
chain 18 and adjustable screw 16. The screw 16 is mounted in the lug 17
attached to the shunt solenoid side or end of the metallic beam E. The object
of the spring 14 is to allow of the strap or brake band 15 being drawn or
tightened after it has bound the pulley M. In case the core or plunger D
descends sufficiently into the series solenoid B the strap or brake band 15 will
rotate the pulley M in the direction indicated by the arrow, which will cause
the pinion L to raise the rack rod K and part the carbons; and by which the
rack rod will be held until the carbous require feeding. When the latter is
necessary the power of the shunt solenoid C will overcome the power of the
series solenoid B and cause the metal core or plunger D to descend into the
shunt solenoid C, by which action the gripping power of the strap or brake
band 15 will be released sufficiently from the pulley M to allow the latter and
the pinion L to rotate by the weight of the rack rod K and its attachments
to feed the upper carbon by gravity. After the upper carbon on the end of
the rack rod K has been automatically fed into the requisite position with the
lower carbon the strap or brake band 15 by the movements of the metallic
lever E again binds or arrests and holds the pulley M. If the carbon on
the end of the rack rod K has dropped too low the metal beam E will, by
means of the strap or brake band 15 and its adjuncts, operate the pulley M
and pinion L to raise the rack rod K and re-adjust the arc to its proper
length. The pulley M and pinion L are attached to of the centre 19 mounted
in the bearings 20 on the base A of the lamp. To ensure of the rack rod K
being free to act with a minimum of friction the opposite side of the rack rod
slides against the bowl or roller 21 on the centre 22 mounted in the bearings 23
on the base A of the lamp. To retard the movement of the metal beam E at
a given point it is fitted with the lug 24, adjusting screw 25, and spring 26;
the other end of the latter being secured to the metallic cylinder J.
For the purpose of cutting the lamp out of circuit when the electric current in
the shunt solenoid C exceeds a certain limit the metallic beam E is fitted with the
lug 27 in which is mounted the adjustable screwed rod R provided with the cranked
or bent portion 28. The lower end of the rod R is mounted in the guides 29
secured to the insulated block N. On the insulated block N is mounted the contact
maker S with the insulated end 30, secured by the screw 31. On the block N are
mounted the stationary contact blocks T and V, both being secured thereto by the
screws 35. The stationary contact blocks T and V are sufficiently elastic to retain
or hold the contact maker S when placed under the same. When the rod R is in
the position shown in Figs. 1 and 2 the contact maker S is held out of contact with
the blocks T and V by the lower end of the rod R, during which the lamp will be
burning. Immediately the power of the shunt solenoid C exceeds the series
solenoid B so as to draw down the core or plunger D and place the cranked or
bent portion 28 below the insulated end 30 of the contact maker S, the latter will
be swivelled under the stationary spring contact T by the spring 32, as shown in
Figs. 6 and 7, by which contact will be broken automatically and the lamp put out.

page_text: To enable the lamp to be cut out of circuit to put out the light by hand the
contact maker S is provided with the rod and handle W, by which it can be
swivelled under the stationary block V as shown in Fig. 8.
The solenoids B and C, stationary contact blocks T and V, and other parts are
connected by electric wires to the terminals F, by which the circuit is complete
when the contact maker S is in the position shown in Figs. 1 and 2.
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:
1. The general arrangements, constructions, and combinations of parts con-
stituting my improvements in electric are lamps, as herein before described and as
illustrated in the annexed drawings.
2. In electric arc lamps, the combination, with series and shunt solenoids and
metallic cores or plungers, of a metallic beam with an oblong or other opening to
allow it to oscillate according to the requirements of the lamp, being mounted on
the centre tube of the lamp by means of screwed pivots, and provided with forked
end and screwed pivots to receive metallic cores or plungers working in the solenoids,
substantially as described.
3. In electric arc lamps, the combination, with series and shunt solenoids and
metallic cores or plungers suspended from a metallic oscillating beam pivoted to the
centre tube of the lamp as set forth in the preceding claim, of a spring coupled to a
belt or brake band which passes round or under a pulley connected to a spur pinion
gearing in the upper carbon rack rod of the lamp, the opposite end of the belt or
brake band being coupled to a chain or its equivalent, the said spring and chain or
its equivalent being provided with means of adjustment and coupled to the before
mentioned metallic beam, for the purpose specified substantially as described.
4. In electric are lamps, the combination, with a metallic beam, series and shunt
solenoids, and metallic cores or plungers, of the adjustable cranked rod R, bearings 29,
contact maker S, spring 32, and stationary block T for the purpose of automatically
switching out the light, substantially as described.
5. In electric arc lamps the combination of the contact maker S, stationary
block V, and the rod and handle W for switching out the light by hand, sub-
stantially as described.
Dated the 24th February 1892.
EDMUND CHADWICK,
Agent.