Year: 1896

page_text: Date of Application, 13th Apr., 1896
Complete Specification Left, 12th Feb., 1897-Accepted, 10th Apr., 1897
FREDERICK WILLIAM HEATON and HARRY SMITH both of Salford Switch
Works Sidney Street Salford Manchester Electrical Engineers do hereby declare
the nature of this invention to be as follows:-
An improved method of insulation between the two poles-which consists of a
vulcanite centre piece with 4 divisions.
The contact pieces are fastened in two divisions-thus leaving an insulated wall
between each contact piece & allowing sufficient room to procure good springy
contact blades, doing away with any insulating material between the contact blocks.
Our invention does away with burning of the insulating material between the
two poles, as their is no insulating material in a sparking or burning position.
of March 1896
F. W. HEATON.
HARRY SMITH.
FREDERICK WILLIAM HEATON and HARRY SMITH Electrical Engineers both
of Salford Switch Works Sidney Street Salford near Manchester do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
Our invention has reference to an improved method of insulating the two poles
on a double pole switch as shewn by accompanying sketch. We have an ebonite or
any other insulating material centre piece A E E (Fig. 1) having 4 projections &
4 recesses or chambers.
The contact blades B & B 1 of each switch are fastened on to two of the
projections viz. those diametrically opposite each other, leaving an insulated
wall E E between each set of contact blades for each pole.
By this method we do away with sparking or burning of the insulating
material because the insulating centre piece is entirely away from the contact
blocks C-C 1-D. D 1 whether switch is on or off.
Our invention provides a quick double break to each pole viz. C-C 1 & D. D1
by means of spring F shewn in Fig. 1.
In Fig. 1 is shewn centre insulator (X shaped) (which turns on centre pillar G)
which is so designed to have 4 projections Á A EE which leave 4 recessed
chambers into which is fixed the contact blades B & B 1 diametrically oppossite
one another & into the other two recesses is shewn the screw heads which
hold B & B 1 in their respective places.

page_text: In Fig. 2 is shewn a side view without contact blocks or terminals of switch with
'handle for turning on or off. The switch blades are shewn & the method of
fastening same on 2 of the partitions-also shewing that part of the metal blades
which make the connections projecting well out past centre insulator.
Having now particularly described and ascertained the nature of our said inven-
tion & in what manner the same is to be performed we declare that what we
claim is-
1. An improved method of insulating the two poles of a double pole electrical
switch by means of a special insulated centre block to which are fixed the
connection blade for each pole.
2. By this method there is no current passing through any portion of the centre
insulator.
3. In our invention the connection blades are let into recesses in a centre
insulator. Each pole in seperate recess which leaves a partition between each pole
-having no insulated material between the contact blocks of either pole when
switch is turned on or off.
F. W. HEATON.
H. SMITH.