Improvements in Tubular Electro-magnets.
Year: 1895

page_text: Date of Application, 10th May, 1895
Complete Specification Left, 3rd Jan., 1896-Accepted, 15th Feb., 1896
Improvements in Tubular Electro-magnets.
I, JAMES TAYLOR, of Heathcicliff, Helsby, near Warrington, in the County
of Cheshire, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
In the construction of tubular electro-magnets, as now used largely in telephonic
exchanges, it is desirable to reduce the magnetic resistance between the core and
the tube of the electro-magnet. Usually the core has to be readily detachable,
and has the solenoid of the electrical circuit wound upon it To get the lowest
magnetic resistance the yoke between the tube and the core is sometimes made
solid with the tube, by taking a solid bar of suitable iron and boring this out so as
to form a tube and yoke. My improvement consists in producing a combined
tube & yoke for tubular electro-magnets, without joint, by a process of stamping
out of sheet Swedish iion.
In the accompanying illustrations Figs. 1, 2 & 3 shew a vertical section, plan &
front elevation of a tubular indicator, and Figs 4 & 5 shew a longitudinal section
and an end view of a combined Lube and yoke.
Throughout the various figures, a illustrates the combined tube and yoke, b 18
the core of the tubulat electro-magnet, c is the armature, pivotted at d, e is the
lever attached to the armature, and is the indicating shutter
Figs. 4 & 5 illustrate an additional improvement shewn by the groove marked h.
This has, usually, to be cut out of a tube to allow of fice movement of the lever e.
In the process of stamping from the sheet, I produce this groove also.
Dated this Ninth day of May 1895
JAMES TAYLOR.
improv
I, JAMES TAYLOR of Heathercliffe, Helsby near Warrington in the County of
Chester, Manufactures, do hereby declare the nature of this invention and in what
manner the same is to be perforined, to be particularly described and ascertained
in and by the following statement.
In the construction of tubular electro magnets as now used laigely in telephono
exchanges, it is desirable to reduce the magnetic resistance between the core and
the tube of the electro-magnet. Usually the core has to be readily detachable,
and has the solenoid of the electrical circuit wound upon it. To get the lowest
magnetic resistance the yoke between the tube and the core is sometimes made
solid with the tube by taking a solid bar of suitable non and boring this out to
form a tube and yoke. My improvement consists in producing a combined tube
aud yoke for tubular electro magnets, without joint, by a process of stamping out
of sheet Swedish iron.
In the illustrations accompanying my Provisional Specification Figs. 1, 2 & 3
shew a vertical section, plan, and front elevation of a tubular indicator, and

page_text: Figs. 4 and 5 shew a longitudinal section and an ond view of a combined tubo and
yoke. Throughout the various figures 'a' illustrates the combined tube and yoke,
b' is the coio of the tubular electro-magnet, 'c' is the armature pivotted at 'd,'
'e' is the lever attached to the armature and '' is the indicating shutter.
Figs. 4 and 5 illustrate an additional improvement shown by the groove
marked 'This has usually to be cut out of a tube to allow of free movement
of the lever 'e.' In the process of stamping from the sheet I produce this groove
also.
Having now particularly descubed and ascertained my said invention and in
what manner the saine is to be performed I declare that what I claim is :-
1. The construction of tubular electro-magnets of a solenoid or helix surrounding
a central core and of a combined outer tube and yoko made in one piece out-of
sheet iron.
2. The combination of a solenoid or helix, a cential core aud a combined outer
tube and yoke made in one piece out of sheet non
3 The construction of a combined outer tube and yoke for tubular electro
magnets in one piece out of sheet iron, and with a longitudinal external groove in
the tube made in the process of stainping on diawing the tube.
Dated this 2nd day of January 1896.
JAMES TAYLOR,