Improvements in or relating to the Regulating Mechanism of Electric Aro Lamps.
Year: 1894

page_text: Date of Application, 8th Feb., 1894
Complete Specification Left, 8th Nov., 1894-Accepted, 8th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in or relating to the Regulating Mechanism of
Electric Aro Lamps.
We, WILLIAM CHARLES MOUNTAIN and GEORGE THEODORE O'BRIEN
CAREW, both of Close Works in the City and County of Newcastle-on-Tyne,
Electrical Engineers, do hereby declare the nature of this invention to be as
follows:-
This invention refers to improvements in or relating to the regulating mechanism
of electric arc lamps and has for its object simplicity of design efficiency of action
and cheapness in manufacture.
To effect our purpose we connect or link onto the core of a solenoid the short
arm of a differential lever suitably centred eccentrically in a bracket. The
current enters the series coil energizes it and attracts the solenoid core.
The long
arm of the lever may be connected to a chain which may pass thence round a drum
or pulley and be connected to the other end of the solenoid core or the long arm
may in the case of differential lamps be connected or linked onto the core of a
shunt coil, the opposite end of the core being connected to a chain which may pass
thence round a drum or pulley and be connected to the end of the core of the series
coil as above described.
The drum or pulley axle may have a pinion on it adapted to gear with a rack
tube or bar the end of which may carry a carbon holder. The other or negative
carbon or holder may be stationary or suspended by a cord over pulleys suitably
arranged on the frame so as to carry both holders in any convenient manner.
The short end of the differential lever may be connected with a piston of a
dash-pot the cylinder of which may conveniently be used as a support for the lamp
frame.
Thus when the current enters the series coil the attraction of the core draws in
the short end of the lever and causes the opposite or longer arm to move on a
relatively extended arc and as the ends of the lever are connected as above
described through the medium of a chain or cord passing round a drum or pulley
the chain will be thus drawn round the barrel and will also be by the action of the
differential lever operated as above described tightened more or less on or against
the drum so as to cause it to rotate and thus actuate or regulate through the
pinion and rack or equivalent gear the position of the carbons.
The chains may preferably be connected to the cores through the intervention
of springs.
Dated this 7th day of Fahru 1901
A. CRAWHALL CHAPMAN,
3, St. Nicholas Buildings, Newcastle-on-Tyne, Patent. Agent.

page_text: Improvements in or relating to the Regulating Mechanism of
Electric Arc Lamps.
We, WILLIAM CHARLES MOUNTAIN and GEORGE THEODORE O'BRIEN'
CAREW, both of Close Works in the City and County of Newcastle-on-Tyne,
Electrical Engineers, 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 refers to improvements in or relating to the regulating mechanism
of electric are lamps and has for its object simplicity of design efficiency of action
and cheapness in manufacture.
To effect our purpose we connect or link onto the core of a solenoid the short
arm of a differential lever suitably centred eccentrically in a bracket. The current
enters the series coil energizes it and attracts the solenoid core. The long arm of
the lever may be connected to a chain which may pass thence round a drum or
pulley and be connected to the other end of the solenoid core or the long arm may
in the case of differential lamps be connected or linked onto the core of a shunt
coil, the opposite end of the core being connected to a chain which may pass
thence round a drum or pulley and be connected to the end of the core of the series
coil as above described.
The drum or pulley axle may have a pinion on it adapted to gear with a rack
tube or bar the end of which may carry a carbon holder.
The other or negative carbon or holder may be stationary or suspended by a
cord over pulleys suitably arranged on the frame so as to carry both holders in any
convenient manner.
The short end of the differential lever may be connected with a piston of a dash-
pot the cylinder of which may conveniently be used as a support for the lamp
frame.
Thus when the current enters the series coil the attraction of the core draws in
the short end of the lever and causes the opposite or longer arm to move on a
relatively extended arc and as the ends of the lever are connected as above
described through the medium of a chain or cord passing round a drum or pulley
the chain will thus be drawn round the barrel and will also be by the action of the
differential lever operated as above described tightened more or less on or against
the drum so as to cause it to rotate and thus actuate or regulate through the pinion.
and rack or equivalent gear the position of the carbons.
The chains may preferably be connected to the cores through the intervention
of springs.
We will fully describe our invention with reference to the accompanying
drawing which shows in sectional elevation its construction and working and
in the following description like marks of reference designate like parts.
Referring to the drawing, let the spaces S, S' represent the series and shunt coils
of solenoids wound on bobbins B, B. a is the core of the series coil the upper
end or extension of which may conveniently work in a dash-pot D for the purpose
of steadying the action of the solenoid. Mounted eccentrically in a bracket is a
lever L the short arm of which is connected or linked to the core a aforesaid the
longer arm being counected or linked to the core a' of the shunt coil the opposite
end of this core being connected to a chain c which may pass thence round a drum
or pulley P and be connected to the end of the core of the series coil through the
intervention of a spring e or its equivalent or instead of this arrangement the long
arm of the lever L may be connected to a chain which may pass thence directly
round the pulley P as above described.
The pulley axle may have a pinion n on it adapted to gear with a rack tube or

page_text: bar n the end of which may carry a carbon holder. The other or negative carbon
or holder may be stationary or arranged as above described.
Thus when the current enters the series coil the attraction of the core draws in
or downwards the short end of the lever L but the longer end moving relatively
faster has the effect of tightening the cord or chain c on the pulley and causing it
to revolve which actuates through the pinion the rack tube and consequently
regulates the arc itself and according as the strength of the current in the solenoid
varies so will the core operate the lever L to revolve the pulley P and regulate
the arc as above described.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is :-
1. In regulating mechanism for electric arc lamps the use of a differential lever
mounted eccentrically and so connected to the core or cores of solenoids as to
regulate the electric arc substantially as herein set forth.
2. In regulating mechanism for electric arc lamps the differential lever L
mounted arranged and combined to co-act with a solenoid or solenoids and
apparatus to regulate the electric arc substantially as herein set forth.
Dated this 7th day of November 1894.
A. CRAWHALL CHAPMAN,
3, St. Nicholas Buildings, Newcastle-on-Tyne, Patent Agent.