Improvements in or connected with Electric Aro Lamps.
Year: 1893

page_text: 1893
Date of Application, 81st Jan,
Complete Specification Left. 81st Oct.. 1893-Accepted, 9th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in or connected with Electric Aro Lamps.
I, JOHN HENRY ROSE, of 45, Adelaide Road, Uxbridge Road, Shepherds Bush,
Middlesex, Electrical Engineer, do hereby declare the nature of this invention to
be as follows:—
The object of this invention is certain improvements in or connected with electric
arc lamps, and relates ;—
1. To an arrangement for temporarily stopping the foed of the carbon penoil
when its holder is raised for striking the arc.
2. To means for adjusting the relative positions of the electro magnet and
armature of the shunt circuit.
"
3. To means for permitting the vertical adjustment of the lower carbon with
respect to the upper carbon.
4. To the construction of the frame or casing enclosing the clockwork
mechanism.
According to my invention, I mount the usual clockwork mechanism. upon the
upper carbon holder, or rack, and movable with it when the primary and shunt
circuit raises the rack for striking the arc.
The clockwork has a projecting piece which comes in contact with a lever when
in the raised position, which arrests the movement, or escapement of the clock
gear, thus stopping the feed of the carbon.
The electro magnet is carried by an arm fitted to slide up or down in a slot of
the frame, the arm has a threaded hole for the reception of an adjusting screw
passing through the frame. The electro magnet by this means can be raised, or
lowered in the slot, and set forward, or backward by the screw.
The armature is attached by an articulation to a block carried by a spring on
the frame, the block being fitted with a set screw for adjustment of the armature
nearer to or farther from the electro-magnet.
For facilitating the vertical arrangement of the lower carbon, I form a sleeve
around that part of the carbon holder which passes through the hole in the cross-
piece, the stem of the holder projecting beyond the sleeve, so that it may be turned
about in the sleeve until the desired vertical position of the carbon is obtained.
The hole in the crosspiece is made somewhat larger than the sleeve to allow of side
adjustment of the holder and carbon, which can be then set by mits on the sleeve
and the holder stem.
In order to prevent leakage of the current through the frame enclosing the
actuating mechanism, I purpose making it of porcelain, vulcanite, fibre, glass slate,
or any such insulating material, and strengthened by brackets and stays at certain
parts.
Deted this 91 2n of To
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said John Henry Rose.
COMPLETE SPECIFICATION.
Improvements in or connected with Electric Aro Lamps.
I, JOHN HENRY ROSE, of 45 Adelaide Road, Uxbridge Road, Shepherds
Bush, Middlesex, Electrical 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 :-
.
The object of this invention, is certain improvements in or connected with
electric ara lamns, and relates:
.

page_text: 1. To an arrangement for temporarily stopping the feed of the carbon pencil
when its holder is raised for striking the aro.
2. To means for adjusting the relative positions of the electro magnets, aud
armature of the shunt circuit.
3. To means for permitting the vertical adjustment of the lower carbon with
respect to the upper carbon.
4. To the construction of the frame or casing enclosing the clockwork
mechanism.
:
According to my invention, I mount gear wheel mechanism upon the upper
carbon holder or rack and movable with it when the primary and shunt circuit
raises the rack for striking the arc. The case carrying the gear wheels has a
projecting piece which comes in contact with a pin to arrest the movement or
escapement of the gear, thus stopping the feed of the carbon.
The electro magnet can be raised or lowered in a slot and set by a screw.
The armature is attached by an articulation to a block carried by a spring on
the frame, the block being fitted with a set screw for adjustment of the armature
nearer to or farther from the electro magnet.
For facilitating the vertical arrangement of the lower carbon, I form a sleeve
around that part of the carbon holder which passes through the hole in the cross-
piece, the stem of the holder projecting beyond the sleeve, so that it may be
turned about in the sleeve until the desired vertical position of the carbon is
obtained,
The holo in the crosspiece is made somewhat larger than the sleeve to allow
a side adjustment of the holder and carbon, which can then be set by nuts on the
sleeve and the holder stem.
In order to prevent leakage of the current through the frame enclosing the
actuating mechanism, I purpose making it of porcelain, vulcanite, fibre, glass,
slate, or any such insulating material, and strengthened by brackets, and stays at
certain parts.
My invention will be understood by reference to the annexed drawings,
in which
Figure 1 is a sectional elevation of an arc lamp with my improvements indicated
between the upper and lower porcelain, or other insulating material:
Figure 2 is a plan view taken just below the upper insulating plate.
A is a box containing a train of wheels, on the arbor of one of which is an
exposed toothed wheel B gearing into a rack on the upper carbon holder C. The
box A has a couple of rings D, D, encircling the carbon holder C as guides, and
it is suspended from the armature frame E for movement therewith when the
armature Fis attracted by the magnets G, G.
The armature frame E is forked, and the armature F is of the full width to
move across the face of the coil cores. The back of the armature frame E is
attached to a springy plate H and hangs from a lipped piece or block I which is
adjustable by the screw J, this being passed through one of the uprights K by
which the upper and lower insulated plates L, L, are connected to form the casing
in which the working parts are enclosed, the weight of the armature being slightly,
borne by a light spring M.
The train of wheels in the box A terminates with an escapement N, and a
lever P from the box A has a tooth to drop in between the points of the escape-
ment N when the box A lowers a certain distance, said plate P then coming into
contact with a stud Q to lift the tooth out of the escapement and set the wheels
free. The lower guide ring D has a depending rod R with its end bent at right
angles to play between the bottom insulated plate L and a bracket S to limit the
up and down movement of the box A and its appendages.
The armature carries an arm T connected to a plunger rod U, the plunger of
which works in a bath of glycerine to steady the motion of the armature.
The upper carbon holder C carries a socket V which is capable of being turned
about for the adjustment of the carbon when the pinching screw W is loosened,

page_text: the socket V being retained to the holder C by the screw pin ✗ working in the
annular recess Y. The lower carbon is also fitted in a socket Z for oircular
adjustment, the rod a of which socket passes through a sleeve b, and is capable of
being fixed by a nut c. The sleeve 6 sits on the crosspiece or bottom frame d and
is capable of side adjustment in said frame, and is fixable when adjusted by the
nut e.
The sleeve is screw threaded for the nut e and for another nut which
forms a support for the glass globe g.
The lamp is put in or out of action by the movement of the switch levor h.
The coils G, G, are attached to an arm or strap i, which is slotted for the
adjustment of the coils by the screw bolt j, said strap i being arranged between the
lips of one of the channel iron uprights K which form the distancing pieces.
k, k, are the primary wires connected to the post I m respectively; and a the
shunt wire.
The action is as follows:-
The carbons having been fitted, the upper resting upon the lower, the current is
switched on, and the armature attracted by the magnets, the box A. is thereby
lifted, and with it the rod C for striking the arc, the wheel B having sufficient
power to lift it by reason of the tooth of the plate P locking the escapement.
As the carbons are consumed, the resistance between the arc increases and
causes the shunt coil to demagnetise the coil core and allow box A and the
holder C to fall until the stop P comes into contact with the stud Q to lift the
tooth out of the escapement and set the train of wheels free, which allows the top
carbon to fall by its own weight until the normal resistance is re-established
between the arc. The primary coil then draws the armature to raise the box A
and holder C to lock the gear until the coil is again demagnetised, and so on.
When the lamp is not working, or in its normal condition, the spring stop P is
free of the escapement, so that when a fresh carbon is being inserted in the socket V
the holder can be pushed up, the gear wheels freely rotating, and therefore not
affecting any of the other moving parts.
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 an electric aro lamp, the arrangement of the armature with the auspended
wheel gear, and appliances in connection therewith in the manner described and
substantially as shown for operation in the manner set forth.
2. The method of and appliances for facilitating the adjustment of the carbons in
line with each other, as described with reference to the annexed drawings.
3. In an aro lamp, the means for setting or adjusting the coils in relation to the
armature, as described.
4. The general construction and combination of the appliances between top and
bottom plates of insulating material substantially as described and represented in
the drawings.
10818L DBY OL VCHODAY IAH.
VUCLIDAY
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said John Henry Rose.