Improvements in Electric Apparatus.
Year: 1891

page_text: Date of Application, 10th Nov., 1891
Complete Specification Left, 10th Aug., 1892-Accepted, 10th Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in Electric Apparatus.
We, THOMAS EDMUND MARSH of 42 Reighton Road, Upper Clapton in the
County of Middlesex, Electrical Engineer, and WOODHOUSE AND RAWSON
UNITED LIMITED of 88 Queen Victoria Street, London, Electrical Engineers
and Contractors, do hereby declare the nature of this invention to be as
follows:-
The object of our invention is to produce an apparatus which working according
to a certain cycle, shall operate a quick break switch at predetermined portions of
the cycle.
We make our apparatus suitable to be placed in any doorway or the like, in such
a manner, that the opening or closing of the door, constitute successive stages of
the cycle, and by means of the stored energy of a spring or its equivalent, a quick
make and break electric switch is operated at suitable portions of the cycle.
We may effect this by arranging on a bar, working in suitable guides, to which
is attached a coiled spring or springs. To one end of the said bar is attached a
spring catch engaging with a ratchet wheel, having a suitable number of teeth, the
latter operating a switch, so arranged that the current is only made or broken at
suitable intervals, according to the number of teeth embraced by the said catch on
the ratchet wheel, and the number of arms and contacts of the switch.
Signed this 9th day of November 1891.
WOODHOUSE & RAWSON UNITED, LIMITED,
W. T. Stutchbury, Secretary.
COMPLETE SPECIFICATION.
Improvements in Electric Apparatus.
We, THOMAS EDMUND MARSH of 42 Reighton Road, Upper Clapton in the
County of Middlesex, Electrical Engineer, and WOODHOUSE AND RAWSON
UNITED LIMITED of 88 Queen Victoria Street, London, Electrical Engineers
and Contractors, 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 :-
The object of our invention is to produce an apparatus which working according
to a certain cycle, shall operate a quick break switch at predetermined portions of
the cycle.
We make our apparatus suitable to be placed in any doorway or the like, and in
such a manner, that the opening or closing of the door constitutes successive stages
of the cycle, by means of the stored energy of a spring or its equivalent, a quick
make and break electric switch is operated at suitable portions of the cycle.
Having reference to the accompanying drawings in which similar letters refer to
similar parts,
Figs. I and II are similar plans of the apparatus. Fig. I represents it with the
spring E at rest Fig. 11 represents it extended.
Figs. III and IV are also plans showing the apparatus on the opposite side of
the base to that represented by Figs. I and II.
In carrying our invention into effect the bar A having the slots B and B¹ is
attached to the base C by the screws D and D' which also act as guides through
the slots B and B'.

page_text: Is a spiral spring.
F is a spring attached to the bar A having a hooked end which engages with the
teeth of the ratchet wheel G.
His a spring which tends to keep the ratchet wheel G steady, and at the same
time assist in making the quick make and break.
In Figs. III and IV J and J are contact plates.
K is a contact bar baving three arms which in certain positions connect the
contact plates J and J. This contact bar K is mounted on the other end of the
same spindle L as the ratchet wheel G.
M is a metal plate for attaching the fuse if necessary.
The apparatus is fastened in a doorway in such a position that on the door being
closed it takes up the position shown in Fig. II.
Now suppose that we start with the door open and the apparatus in the positions
shown in Figs. I and III, upon closing the door the bar A is forced into the
position shown in Fig. II, but the contact bar K remains as shown in Fig. III, it
will be seen that upon opening the door the bar A is drawn back by the spring E
drawing the ratchet wheel G round with it and therefore the contact bar K one
sixth of a revolution, thus making connection between the contact plates J and J
as shown in Fig. IV, the bar A again taking up the position shown in Fig. I.
Now on again closing the door the bar A is forced into the position shown in
Fig. II, the contact bar K remaining in position as shown in Fig. IV, but on
opening the door the ratchet wheel G and contact bar K are drawn round another
sixth of a revolution and take up the position shown in Figs. I and III the position
from which we originally started.
It will he readily understood that although only this one operation is described,
by varying the number of teeth in the ratchet wheel G and the number of arms on
the contact bar K, other cycles may be made, performing different operations at the
different stages of the cycle.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same has to be performed, we declare that what we
claim is :-
An electric switch operated by the combined action of a press button connected
to a spiral spring or its equivalent of a ratchet and pawl, a check spring and
suitably disposed contact arms substantially as described and for the purposes set
forth.
Dated this 10th of August 1892.
T. E. MARSH.
WOODHOUSE & RAWSON UNITED, LIMITED,
A. L. Foley, Secretary.