Improvements in Electric Arc Lamps.
Year: 1892

page_text: Date of Application. 14th Apr., 1892
Complete Specification Left, 28th July, 1892-Accepted, 3rd Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in Electric Arc Lamps.
I, HAYDN THIES HARRISON, of 29 Dorchester Place, Blandford Square,
London, N.W. Electrical Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention has reference to a simple and compact construction of electric
arc lamps in which a nearly closed magnetic field and a friction block connected
to the cores of suitable coils are employed, the said block being caused to act at
the required times upon pulleys over which pass cords that carry the carbon holders,
and which are so mounted as to be capable of assuming different distances apart.
The lower carbon holder is supported by rods suspended to the before mentioned
cords and arranged telescopically within tubes attached to the lamp frame, and
those ends of the cords that carry the upper carbon holder are arranged within
other tubes which are slotted.
An arrangement of lamp according to this invention is as follows:-
Two cores are so connected as to form a horse-shoe core which is drawn into two
coils fixed to the top plate of the lamp which is made of wrought iron thus causing
attraction upward of the horse shoe core to close the magnetic field and adding
greatly to the pull.
On the horse shoe core mounted between its arms and parallel to them is a square
metal block which rubs on the peripheries of two pulleys having deep grooves in
them; these pulleys are caused to bear against the block being for this purpose
pivotally mounted in slots that are inclined downward towards the block. The top
of the block is normally in the same horizontal plane as the axes of the two pulleys
so that directly the horse shoe core lowers the block below that level owing to
weakness of the current in the coils the pulleys will be free to partly rotate and
allow the lamp to feed. In the grooves of the two pulleys are the cords suspending
the carbon holders. The carbon holders cousist of four tubes, the top carbon
holder slides over the two inside tubes which have their axes in the same vertical
plane as those of the outside tubes in which two rods move freely the bottom ends
of which are joined together by a connecting piece of metal on which the lower
carbon holder is fixed; the top ends are attached to the two cords which pass over.
the two pulleys and down the insides of the two inside tubes to hooks fastened to
the top carbon holder and arranged to move freely up and down in two slots cut
in the inner sides of the two inner tubes.
Dated this 14th dow of April 1895
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Electric Arc Lamps.
I, HAYDN THIES HARRISOx of 29 Dorchester Place, Blandford Square,
London, N.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 has reference to a simple and compact construction of electric
arc lamps in which a nearly closed magnetic field and a friction block connected to
the cores of suitable coils are employed the said block being caused to act at the
Го

page_text: required times upon pulleys over which pass cords that carry the carbon holders,
and which are so mounted as to be capable of assuming different distances apart.
The lower carbon holder is supported by rods suspended from the before
mentioned cords and arranged telescopically within tubes attached to the lamp|
frame, and those ends of the cords that carry the upper carbon.holder are arranged
within other tubes which are slotted.
•
In the accompanying drawings,
Fig. 1 is a front elevation with the cover removed, and
Fig. 2 a transverse section showing an arrangement of lamp according to this
invention.
A A are two magnetic cores connected by a cross-piece A¹ so as to form a horse-
shoe core.
BB are two coils or solenoids fixed to the top plate B! which is made
of wrought iron, thus causing attraction upward of the horse shoe core to close the
magnetic circuit or field and adding greatly to the pull.
Mounted on the cross piece B between the cores A. A and parallel to them is a
friction block C slightly tapered at its upper part which rubs on the peripheries of
two deeply grooved pulleys D. This block may with advantage be roughed on
those surfaces that bear against the peripheries of the two pulleys. These pulleys D
are caused to bear against the block C being for this purpose carried by axles D¹
pivotally mounted in slots D' that incline downward towards the block C. The
top of the block is normally in the same horizontal plane as the axles of the two
pulleys so that directly the horse shoe core lowers owing to weakening of the
current in the coils A A the block will fall below that level and the pulleys will be
free to partly rotate and allow the lamp to feed. In the grooves of the two
pulleys D are cords E suspending carbon holders F F. The top carbon holder F
slides over two inside tubes G G which are connected by a metal bar G¹ in which
is fixed a porcelain bush G³ that serves as an insulating guide for the upper
carbon. In the same plane as the tubes G G are two outside tubes H H in which
two rods II move telescopically, the bottom ends of which are joined together_by
a connecting piece of metal I' on which the lower carbon holder F¹ is fixed. The
top ends of the rods I are attached to the two cords E E which pass over the two
pulleys D and down the two inside tubes G to hooks F fastened to the top carbon
holder and arranged to move freely up and down in corresponding slots cut in the
inner sides of the two inner tubes. To steady the movements of the friction block C
the saine is provided with a stem C' by which it is connected to the plunger of a
dash-pot or cataract J.
When the attraction of the coils B draws up the cores A, the friction block C
turns the wheels in the direction indicated by the arrows in Fig. 1 and thereby
moves the carbons apart. When however the coils become weaker the block C
descending allows the pulleys to turn in the opposite direction and the carbons to
approach each other, the parts.being suitably weighted to allow this.
Having now particularly described and ascertained the nature of the said
invention and in what manner the. same is to be performed I declare that what
I claim is :-
:
1. An electric arc lamp in which the carbons are actuated by a friction block
carried by magnetic cores of suitable coils and arranged to act at the required
times upon pulleys, over which pass cords that carry the carbon holders, said pulleys
being so mounted as to be capable of assuming different distances apart substantially
as herein described for the purpose specified.
2. My improved electric arc lamp constructed and operating substantially as i
described and shown.
HAYDN THIES HARRISON.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.