An Improved Means for Making and Breaking Electric Circuits.
Year: 1898

page_text: Date of Application, 25th May, 1898-Accepted, 30th July, 1898
COMPLETE SPECIFICATION.
An Improved Means for Making and Breaking Electric Circuits.
I, ADOLF WILHELM SAUERBREY, of Wettinerstrasse, Dresden A., Saxony,
Engineer, 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 :-
In this invention an electric circuit is made by the meeting of two or more contacts
with different or like resistances and actuated from batteries or other sources of
electricity and a relay, this means being more especially designed for signalling
trespasses, and unauthorised meddling with or removal of objects as for instance by
thieves or burglars.
In the accompanying drawing Fig. 1 is a diagrammatic view of the means of this
invention for making and breaking an electric circuit and Fig. 2 is a perspective
view of a form of contact device adapted for use therewith.
a, a¹, are two magnet bobbins of a relay, said bobbins at one end being connected
through a bridge wire b, the opposite ends of the same being connected with the
batteries or sources of electricity c, c¹, of suitably exchanged polarity, from which
sources the wires d, d, lead through circuit closers or cutouts e, e¹, to the
contacts f, fl and from these the wires g, g, to the wire h, and this to the bridge
wire b.
In the above arrangement if the circuit closer e is closed the current flows through
the battery or source of electricity c onwards through the magnet bobbin a, the
bridge b, the wires h and g and the contact f and again into the circuit closer e,
whereupon the magnet a is energised and attracts an armature (not shewn).
If now the other circuit closer e¹ is closed the other magnet bobbin a¹ is likewise
energised and if both magnets are of equal dimensions or power the armature
will remain in the state of rest position.
If however the one or the other contact comes into operation the current is
broken in one bobbin, whereby the other bobbin is caused to attract the armature.
The contact devices f, f, comprise a carbon cylinder or bolt (Fig. 2) fixed to a
spring i and a platinum screw m adjustable relatively to said carbon cylinder and
connected with a resistance of determined dimensions, which screw, upon the
occurence of any shock to, or movement of its stand, and other parts in connection
there with or adjacent thereto, comes into operation, and thereby actuates a suitable
signalling device, for instance, a bell, microphone, etcetera.
o is a lug projecting from the casing of the contact device and carrying a
screw p by which the casing may be raised and lowered at one edge to adjust the
contact for a slight or increased play.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In electric circuits the arrangement of one or more contacts in connection
with relays which in the state of rest position do not influence their armature, for
.
1
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page_text: 2. In the arrangement of electric circuit referred to, the contact or contacts
consisting of a carbon cylinder or bolt and a screw or stud connected with a
resistance and adjustable relatively to said carbon cylinder, for the purpose
specified, substantially as described and shewn.
Dated this 25th dow of Mox 1808
THOMAS R. SHILLITO,
15, Tooks Court, Chancery Lane, London, E.C.