An Improved Construction or Arrangement of Switch for Electrical Purposes.
Year: 1886

page_text: Date of Application, 9th Dec., 1886
Complete Left, 9th Sept., 1887.
Complete Accepted, 11th Oct., 1887
RESERV
An Improved Construction or Arrangement of Switch for
Electrical Purposes.
I, ALFRED SLATTER of Sekforde Street, Clerkenwell, Middlesex, Electrician,
do hereby declare the nature of this invention to be as follows :-
:-
The object of this invention is to construct or arrange a switch appliance that by no
possible means can it be accidentally shifted from make to break or vice versa, the
appliance being fixed so to speak at whatever position it is placed, which must be
effected by hand, a little force or pressure being exerted to effect the movement.
For the purpose of my invention, I fit a rotatable stem in a suitable box or casing and
encircle the stem by a coiled spring one end of which abuts against an arm projecting
from the stem the other end of the spring bearing against the cup or cover of the
casing. The arm moves radially over a metal contact piece formed with a tooth or
half tooth, the other half being formed of an insulating material upon the body of
which the arm can also be moved.
The stem is surmounted by a button which it is necessary to pull outwards to
compress the spring and lift the contact arm over the tooth, the rebound of the spring
when the button is released forces the arm to the bottom of the tooth on either side
whether for switching the current on or off.
The tooth is sufficiently high to resist any slip or sliding action of the arm so that
the button and stem must be raised to be cleared from one to the other.
The stem is extended somewhat beyond the arm into an aperture serving as a guide
but in conjunction with a hole in the cover compels the stem to have a straight action
when pulled upon for turning it for switching purposes.
nul 1
1000
H. GARDNER,
166, Fleet Street, London,
Agent for the said Alfred Slatter.

page_text: I ALFRED SLATTER of Sekforde Street, Clerkenwell, Middlesex, Electrician
do hereby declare the nature of my said invention and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement :-
The object of this invention is to construct or arrange a switch appliance that by no
possible means can it be accidentally shifted from make to break or vice-versa, the
appliance being fixed, so to speak, at whatever position it is placed, which must be
accomplished by hand, a little force or pressure being exerted to effect the movement.
The invention will be clearly understood by the annexed drawings according to
Figures 1 to 8 respectively.
I fit a rotatable stem A in a suitable box or casing B, and encircle the stem A by a
coiled spring one end of which abuts against, or is connected to an arm D projecting
from the stem A, the other end of the spring bearing against the cup or cover E of
the casing.
The arm D or arms D D is or are movable under or over a metal contact piece F,
(solid or tongue shape) formed with a tooth or half tooth G the other half H being
formed of an insulating material upon or under the body of which the arm or
arms D, D, can also be moved.
The stem A may be surmounted by a button J as at Figures 3 and 4 which can be
pulled upwards or outwards to compress the spring C and lift the contact arm D over
the tooth G or by a depression of the spring for the arm to pass under the tooth,
the rebound of the spring C when the button is moved carries the arm or arms over
or under the tooth on either side for switching the current on or off, the arm or arms
being temporarilly fixed in either position.
The tooth G is sufficiently high to resist any slip or back sliding action of the arm
or arms D so that the button and stem A or stem and cover must be raised or pressed
to clear the arm or arms D from the contact piece or pieces to the insulated piece or
pieces, and vice versa.

page_text: Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed I declare that what I claim is :-
The improved switch shown in the drawings which by a circular motion of the cover
forming part of the spindle or the spindle head when not having the cover in
combination can put the arms D, D, into contact with the toothed contact pieces F or
with the toothed insulated pieces H for switching on and off as described.
The 9th dow of September 1887
H. GARDNER,
166, Fleet Street, London,
Agent for the said A. Slatter.