Improvements in Electric Arc Lamps.
Year: 1891

page_text: Date of Application, 6th Feb., 1891-
Complete Specification Left, 24th June, 1891-Accepted, 25th July, 1891
PROVISIONAL SPECIFICATION.
Improvements in Electric Arc Lamps.
I, EMILY ELIZA LEVER of Hawthorn Bank, Stamford Road, Altrincham, in
the County of Cliester, Gentlewoman, do hereby declare the nature of this
invention to be as follows:-
A
These improvements tend to simplify and cheapen the construction and manu-
facture and refer to electric arc lamps adapted for series or multiplex arc.
solenoid serving also as a dashpot regulates the arc and is provided with fine wire
shunt circuit coils. It is placed on the bedplate upon which is also fixed a gallows-
like frame forming a guide for the upper carbon holder. From each side of the
horizontal limb of the gallows frame depends a helical spring carrying a lever
having its fulcrum on the upright limb of the frame and at the outer or free end
being each by a short link connected to a solenoid core. The two levers are cross
connected. Each solenoid limb has a cylindrical recess for the core to work in
with a fairly good fit and so as to form an air cushion at the bottom to check the
too quick descent of the upper carbon holder. The clutch for gripping the upper
carbon holder is a ring adapted to be canted. This ring is at one end supported in
a staple on the levers and at the other end supported in a staple pendent from the
horizontal limb of the frame. Within the frame is arranged a resistance coil so
arranged as to cut out the lamp in case the circuit through the carbons becomes
defective.
Dated this 6th day of February 1891
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Electric Arc Lamps.
I, EMILY ELIZA LEVER of Hawthorn Bank, Stamford Road, Altrincham, in
the County of Chester, Gentlewoman 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 :-
These improvements tend to simplify and cheapen the construction and manu-
facture of electric arc lamps adapted for series or multiple arc.
In the accompanying drawings Fig. 1 is a front elevation and Figure 2 a side
elevation of the lamp while Fig. 3 is a vertical section through a solenoid serving
also as a dash pot. Fig. 4 is a plan section on line X X Fig. 1.
The lamp is of the kind wherein the carbon electrodes do not make contact with
cach other before the current is sent through the lamp and wherein a solenoid in a
shunt circuit of much greater resistance than that of the arc circuit is employed for
regulating the arc and serves also as a dash pot, a resistance coil and cut out
magnet being also provided. The improvements consist in the construction of the
frame, and the construction, conformation and combination of the parts arranged
therein.
A. is the arc regulating solenoid provided with fine wire coils their upper end
being connected by the wire A¹ to the positive terminal P which by a flat piece of
copper P communicates current to the upper or positive carbon holder C, said
piece passing through the split screwed upper termination P of the terminal and
being held therein by a nut P. The solenoid coils are at their other end connected
..

page_text: by the wire A' to the negative terminal M. The solenoid and other parts are
placed on the bed plate B formed in one with a gallows like frame B1 B2, the bed-
plate B and the part B forming lower and upper guides for the upper carbon
holder C. From one side (or both) of the horizontal limb B2 of the frame depends
a helical spring D carrying a lever E being connected thereto by a bracket E' for
the screwed end D' of the spring D to pass through, D' being a nut thereon for
regulating the tension of the spring. The lever E is double or a frame shaped
casting with cross connections the two side parts grasping the limb B¹ between
them and having their fulcrum therein. The stroke of the lever E can be adjusted
by the set screw Q against the bracket R on the frame B. At the other or free
end one outer side part of the lever E is by a short link F' connected to the solenoid
core F which works with a fairly good fit in the solenoid except as preferred at
the slightly reduced places Fx and F** which are provided for diminishing the
friction and so as to form an air cushion at the bottom to check the two quick
descent of the upper carbon holder C; this air cushion forms a clean and effectual
means of checking and is much to be preferred, before the dash pot arrangements
heretofore in use where glycerine and other liquids were used. The clutch for
gripping the upper carbon holder C is a usual gripping canting ring G provided
with a lug on each side which lugs are freely guided in a staple G¹ fixed on one of
the cross bars of the lever E and in a staple G² fixed under the upper limb B of
the frame. Within the frame is arranged a resistance coil H which at its lower
end is connected with the negative terminal M and at its upper end with the magnet
coil round the bar K which at the top has a central brass part K¹ and comes
opposite an adjustable armature L which is screwed into one of the side parts of
the lever E. The other end of the coil I is connected with the brass stud K' in
the bar K. When the stud K¹ comes in contact with the adjustable armature L, a
circuit is established to the positive terminal P thereby cutting the lamp out, a
resistance being formed by the coil H equal to that of the lamp circuit.
N is a rod with a head at each end and which passes through the bed-plate B
and through a small bracket fixed on the side of the lever E. This rod serves to
test the mechanical working of the lamp or to start the lamp when required without
having to remove the cover, by pulling down the lever E. The action of the lamp
is as follows:
In starting the lamp by turning on the current (with or without assisting the
descent of the lever E by pulling down the rod N) the solenoid A. becomes
energized and attracts the core F and the lever E connected thereto so that the
armature L comes in contact with the button K of the cut out magnet KI. A
circuit, is then, but only for a moment established to the positive terminal P and
the lamp is cut out. The instant the carbons touch each other the solenoid loses
its power and the spring D draws up the lever E and cants the ring G which grips
and lifts the upper carbon holder so as to form the arc and cause the lamp to burn
steadily. The arc is regulated by the spring D and solenoid A. If the lamp
should be out of order or the carbons broken, the current energizing the solenoid
will draw down the core F and lever E with armature L which latter on touching
the button causes the lamp to be cut out, the lever E being held down by the
magnet K and the current passing through the cut out coils and resistance coils on
the next lamp or in case of there being only one lamp passing to the dynamo
machine this will continue until the lamp is attended to. The lamp may be so
regulated that the upper carbons shall drop before the cut out contact takes
place.
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. In an are lamp the combination of an are regulating shunt solenoid A serving
also as a dashbot and an adioining cut out macuet. I K with resistance coil Ha

page_text: double lever E actuated by the solenoid core and having an armature for the cut
out magnet, a spring for pulling back the lever a clutch ring connected to the lever
for gripping and raising the upper carbon holder when canted and a bed plate
with gallows frame wherein the aforesaid parts are contained substantially as
set forth.
2. The construction of the lamp shewn on the drawing.
of June 1891.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.