Improvements in Electrical Fire and Burglar Alarm Connections.
Year: 1892

page_text: Date of Application, 12th Sept., 1892-Accepted, 22nd Oct., 1892
COMPLETE SPECIFICATION.
Improvements in Electrical Fire and Burglar Alarm Connections.
We, HOMER TONG WILSON, Gentleman, of Louisville. Jefferson County,
Kentucky, and NATHAN SCHWAB, Merchant, Goldsboro, Wayne County, North
Carolina, 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 :-
Our invention has relation to electrical fire and burglar alarm connections and
the object is to provide a simple, cheap and reliable connection of the class
described and adapted to either an open or closed circuit as described, and to
these ends the novelty consists in the construction, combination and arrangement
of parts of the same as will be hereinafter more fully described and particularly
pointed out in the claims.
In the accompanying drawing the same letters of reference indicate like parts of
the invention.
Figure 1 is a side elevation of our improved connection as it appears when used
in a closed circuit, and
Figure 2 is a similar view as applied to an open circuit.
A is an insulating block to which is secured by an insulated rivet, a, two spring
blades, B and C, which are provided with the usual conducting wires b and c.
In Figure 1, the blade B is bent back upon itself to form a loop &, and then a
V-shaped offset c' is formed near its free end e, which is in electrical contact with
the bevelled face c², of the blade C, so that if the offset c¹ be pressed inwardly as
by a door or window, the circuit will be broken and the alarm sounded.
The space in the loop 1, is filled with a cement or composition E, which serves
to keep the loop apart and the points e and c², held in contact, and if the tempera-
ture be raised to such a point as to soften or melt the composition E, the sides of
the loop spring together and break the contact between the points e and c².
In Figure 2 the construction is practically the same, except that the offset c', is
placed upon the blade C and the blade B is bent to spring outwardly but is held by
the composition E, so that the points e, and c², are not in contact and if the offset c¹
be operated by a moving object as a door or window, the points e and c², are brought
into contact and the circuit closed, or if the temperature be raised to melt the
composition E, the loop o¹, springs open and the circuit is closed through said
points e aud c
It will be observed that the contacts e and c³, are bevelled and consequently
make a sliding connection, this ensuring a perfect self closing contact.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that
what we claim is :
1st. The combination with the blade C of the blade B bent to form a loop 61
which is provided with a melting composition E, as and for the purpose set forth.
2nd. The spring blade B having loop filled with a melting composition E,
and having the offset c' in combination with the spring blade C, having bevelled
face c, as and for the purpose set forth.
Dated this 10th day of September 1892.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent.