Improvements in Electrical Aro Lamps.
Year: 1893

page_text: Date of Application, 1st Apr., 1893
Complete Specification Left, 1st Jan., 1894-Accepted, 3rd Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in Electrical Aro Lamps.
FRANK BRYAN 11, Brackley Terrace Chiswick,. London, W., Electrical
Engineer, do hereby declare the nature of this invention to be as follows:-
:-
This invention cousists in an improved form of mechanism for controlling the
feed of the carbon electrodes of electric arc lamps.
In Fig. 1 Y is the base of the lamp upon which are mounted -the solenoids C
and C₁ of which C is suitably wound and connected so as to be in series with the
arc and C¹ is wound suitably and connected so as to be in derivation or shunt to the
arc as is usual in many well known forms of arc lamps.
These solenoids are provided, with magnetic cores A. A which are suitably
pivotted or linked to the rocking lever L- which is arranged. to turn on the
centre E.
Upon the branch L' of this lever is fixed an arbor X upon which is free to
rotate the brake wheel B to which is fixed the chain wheel D. The brake B. is
carried upon and pressed against the brake wheel by a spring S which in turn is
fixed to any convenient part of the rocking lever so as to partake of its movements
about the centre E. The guide pullies P P₁ are free to rotate upon arbors carried
by the rocking lever as shown. W W is a chain connected to the sliding carbon
holdere K Kin such a manner that the descent of the top carbon holder K owing
to its excess of weight draws up the lower holder K¹ and in so doing causes the
brake wheel B to rotate. This action cannot however take place unless the brake B
is removed from contact with the brake wheel by reason of its being brought into
contact with the releasing screw R suitably arranged on the base or other
fixed part.
The action of the lamp is as follows: Supposing the carbons are in contact when
the current is first put on, the current then passes through the series coil and
carbons causing the core A to pull down the end of the rocking lever. This
carries the brake wheel and brake B, (which has been kept out of contact with the
wheel through pressing against the screw R) over to the right, the brake prevents
the brake wheel from turning as soon as it is free of the screw R.and consequently
the chain W, being prevented from slipping by reason of the pins on the chain
wheel over which it passes, moves along with the rocking lever, being lifted at the
end-going over the pulley P¹ and lowered at the other end thus. separating the
carbons and striking the arc. Upon-the-burning-away of the carbons the shunt
coil gradually pulls down the core A' and with it the rocking lever-until-a-
position is reached when the brake is removed from contact with the brake wheel
which then rotates under the influence of the weight of the top carbon holder and
thus allows the carbons to approach towards each other, this reduces the current
through the shunt coil and the rocking lever consequently moves back again
and allows the brake to again arrest the rotation of the brake wheel.
In order to make the apparatus more compact 1 may arrange the mechanism as
shown in Figs. 2 & 3. In these C & C are the regulating solenoids which
through their cores, A. & A' actuate the see-saw lever M. Fixed upon the same
axis as M is the crank dise N having a pin O which actuates a connecting rod
for transmitting the motion of the said lever M to the rocking lever L which
carries a brake wheel, brake & pinion & pullies exactly similar to that shewn in
Fig. 1 and the action is exactly identical. Instead of the connecting rod and crank

page_text: disc an eccentric and eccentric rod or a suitable cam arrangement may be used to
effect the desired object of causing the movements of the see-saw lever to actuate
the rocking lever. _
COMPLETE SPECIFICATION.
Improvements in Electrical Arc Lamps.
FRANK BRYAN 11, Brackley Terrace, Chiswick, London, W., 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 :-
This invention consists in an improved form of mechanism for controlling the feed
of the carbon electrodes of electric arc lamps.
Referring to the drawings left with the Provisional Specification Fig. 1 Y is the
base of the lamp upon which are mounted the solenoids C and C. of which C is
suitably wound and connected so as to be in series with the arc and C is wound
suitably and connected so as to be in derivation or shunt to the arc as is usual in
many well known forms of arc lamps.
These solenoids are provided with magnetic cores A A. which are suitably pivotted
or linked to the rocking lever L which is arranged to turn on the centre E. Upon
the branch L of this lever is fixed an arbor X upon which is free to rotate the
brake wheel B to which is fixed the chain wheel D. The brake B is carried upon
and pressed against the brake wheel by a spring S which in turn is fixed to any
convenient part of the rocking lever so as to partake of its movements about the
centre E. The guide pullies P P' are free to rotate upon arbors carried by the
rocking lever as shown. W W is a chain connected to the sliding carbon
holders K K in such a manner that the descent of the top carbon holder K owing
to its excess of weight draws up the lower holder K and in so doing causes the
brake wheel B to rotate. This action cannot however take place unless the brake B
is removed from contact with the brake wheel, by reason of its being brought into
contact with the releasing screw R suitably arranged on the base or other
fixed part.
The action of the lamp is as follows: Supposing the carbons are in contact when
the current is first put on, the current then passes through the series coil and
carbons causing the core A to pull down the end of the rocking lever. This carries
the brake wheel and brake B (which has been kept out of contact with the wheel
through pressing against the screw R) over to the right; the brake prevents the
brake wheel from turning as soon as it is free of the screw R and consequently
the chain W being prevented from slipping by reason of the pins on the chain
wheel over which it passes, moves along with the rocking lever, being lifted at the
end going over the pulley P¹ and lowered at the other end, thus separating the
carbons and striking the arc. Upon the burning away of the carbons the shunt.
coil C gradually pulls down the core A' and with it the rocking lever until a
position is reached when the brake is removed from contact with the brake wheel,
which then rotates under the influence of the weight of the top carbon holder and
thus allows the carbons to approach towards each other, this reduces the current
through the shunt coil and the rocking lever consequently moves back again and
allows the brake to again arrest the rotation of the brake wheel.
In order to make the apparatus more compact I may arrange the mechanism as
shown in Figs. 2 & 3. In these C & C are the regulating solenoids which through
their cores A & A' actuate the see-saw lever M. Fixed upon the same axis as M
is the crank disc N having a pin O which actuates a connecting rod for transmitting

page_text: the motion of the said lever M to the rocking lever L which carries a brake wheel,
brake and pinion and pullies exactly similar to that shown in Fig. 1 and the
action is exactly identical. Instead of the connecting rod and crank disc an
eccentric and eccentric rod or a suitable cam arrangement may be used to effect
the desired object of causing the movements of the see-saw lever to actuate the
rocking lever.
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 electric arc lamp the combination with a rocking lever or frame actuated
by one or more electro-magnets or solenoids of a brake wheel for controlling the
motion of the carbon holding devices substantially as shown and described.
2. In an electric arc lamp the combination with a rocking lever or frame actuated
by one or more electro-magnets or solenoids, and carrying a brake wheel, of a brake
carried by the said rocking lever or frame substantially as described and for the
the purpose set forth.
3. In an electric arc lamp the combination with a rocking lever or frame carrying
a brake wheel and brake and actuated by one or more electromagnets or solenoids
of a chain wheel fixed to and revolving with the said brake wheel.
4. In an electric are lamp the use of a rocking lever or frame carrying a brake
wheel, brake & chain wheel, and guide pulleys for the chain-substantially as shown
and described and for the purpose set forth.
5. In an electric arc lamp the combination of a rocking lever or frame carrying
a brake wheel brake and chain wheel with a fixed stop, screw, or abutment for
causing the said brake to release the brake wheel substantially as shown and
described.
6. In an electric arc lamp the arrangement and combination of a see-saw lever
actuated by one or more electromagnets or solenoids with a rocking lever or frame
carrying a brake wheel and chain wheel the said see-saw lever actuating the rocking
lever or frame through a connecting link and crank, or other suitable mechanism, in
such a manner as to cause the motion of the see-saw lever to move the said rocking
lever or frame in a plane at or about at right angles to the plane of motion of the
said see-saw lever.
7. The arrangement and combination of the various parts and mechanism of an
electric arc lamp substantially as shown and described and for the purposes set
forth.
Dated 1nt dan
1004