Improvements in Electrical Contacts for Burglar and like Alarms.
Year: 1895

page_text: Date of Application, 16th Dec., 1895
Complete Specification Left, 16th Sept., 1896-Accepted, 17th Oct., 1896
Improvements in Electrical Contacts for Burglar and like Alarms.
We, ADRIEN JOSEPH MOULART and ARTIEN DE GALARD of 13 Ruo Lambert,
Paris, in the Republic of France both Electricians, do hereby declare the nature of
this invention to be as follows:-
The object of our invention is an electrical contact applicable to all kinds of
fastenings and intended to operate a bell or other alarm apparatus, by the closing
of the circuit following the opening of any object to which our contact system
is applied.
Secured laterally to an insulator, near the top, by means of a screw are two
flexible plates provided with a contact screw to which are fastened bell line wires.
The insulator is composed of ebonite or some similar material.
The two flexible plates are bent over the insulator where they are pressed down-
wards by a contact knob beared by a stem which passes through the insulator.
A spring keeps the stem pressed against the plates whereby the contact is
assured.
Any pressure exercised on the lower button of the stem raises the latter and
with it, the upper-knob, which releases the two plates thus opening the circuit.
The tension of the spring operating on the shoulder of the stem brings back the
latter with its upper knob into contact position.
The apparatus is fixed to the closing or fastening device of any object, such as
a window, piece of furniture, box, etc., by means of screws passing through
suitable openings in such a manner that the button may press firmly against that
part of the closing device or fastening, which is opposite to, or faces the apparatus
in position. The effect of this pressure, while it is sustained, is to cut off the
circuit between the plates and the bell line wires attached thereto, owing to the
raising of the knob at the top of the stem. As soon, however, as any attempt is
made to open or undo the fastenings, the pressure on the button being lessened, or
wholly withdrawn, the spring brings back the knob at the top of the stem into
contact with the plates so as to close the circuit and actuate the alarm apparatus
connected with the circuit.
Dated this 12th day of December 1895.
L. DUVINAGE,
Agent for Applicants.
We ADRIEN JOSEPH MOULART and ARTIEN DE GALARD of 13 Rue Lambert,
Paris, France, both Manufacturers, 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, of which the accompanying drawings give an
illustration, is an electrical contact applicable to all kinds of fastenings and

page_text: intended to operate a bell or other alarm apparatus, by the closing of the circuit
following the opening of any object to which our contact system is applied.
Fig. I is a longitudinal section of the apparatus, placed in circuit.
Fig. 2 is a side view of the same.
Fig. 3 is a top view, and
Fig. 4 a view in elevation of the apparatus out of circuit.
Secured laterally to the insulator A, near the top, by means of a screw, b, are
two flexible plates B, provided with a contact screw C, to which are fastened bell-
line wires. The insulator A is composed of ebonite or some similar material.
The two plates B are bent over the insulator where they are pressed downwards
by the contact knob, d, of the stem D, which passes through the insulator.
A spring E keeps the stem D pressed against the plates B whereby the contact
is assured.
Any pressure exercised on the lower button d, raises the stem D and with it
the knob d, which releases the two plates B, thus opening the circuit. The tension
of the spring operating on the shoulder d" brings back the stem D, with its upper
knob or button d, into contact position.
The apparatus is fixed to the closing or fastening device of any object, such as a
window, piece of furniture, box, etc., by means of screws passing through the
openings a, in such a manner that the button d¹ may press firmly against that part
of the closing device or fastening, which is opposite to, or faces the apparatus in
position. The effect of this pressure, while it is sustained, is to cut off the circuit
between the plates B and the bell-line wires attached thereto, owing to the raising
of the knob, d, at the top of the stem D. As soon, however, as any attempt is
made to open or undo the fastenings, the pressure on the button d, being lessened,
or wholly withdrawn, the spring E brings back the knob or button d, at the top of
the stem D, into contact with the plates B so as to close the circuit and actuate
the alarm apparatus connected with the circuit.
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 :-
An electrical contact apparatus intended for burglar and like alarms, distinguished
by an insulator A, provided with two contact plates B carrying contact screws C
for the bell-line wires, a stem D passing through the insulator and provided with
a contact knob d, a push button d' and a shoulder d on which the spring E bears,
bringing the knob d into contact with the plates B, whenever there is no pressure,
or merely a very slight pressure, exercised on the button d', and thus operating
the bell or other alarm device, as described in the above specification and shown
in the accompanying drawing.
Dated this 15th day of Sentember 1896.
L. DUVINAGE,
Agent for Applicants.