An Electrically Protected Locking or Fastening Device for Doors or the like.
Year: 1895

page_text: Date of Application, 28th June, 1895-Accepted, 3rd Aug., 1895
COMPLETE SPECIFICATION.
An Electrically Protected Locking or Fastening Device for Doors
or the like.
ADRIEN MOULART of No. 13, Rue Lambert, Paris, in the French Republic,
Electrician do hereby declare the nature of this invention and in what manuer
the same is to be performed, to be particularly described and ascertained in and by
the following statement :-
The subject of this invention is a device for closing or fastening doors, windows,
blinds and like objects, such device being fitted with means of closing an electrical
circuit in such a manner that any attempt made to open the door, window or the
like necessarily causes the circuit to be completed and a signalling or alarm device,
included in such circuit, to be operated.
The invention will be best understood by reference to the accompanying
drawings, in which
Figure 1 is a front view of one form in which this invention should be preferably
carried out; it being shown partly in section;
Figure 2 is a section on liner Figure 1;
Figure 3 is an elevation of the other form in which the invention may be carried
out, and
Figure 4 is a section thereof on line y y, Figure 3.
Upon the casing a (Figure 1) of the fastening bolt there is secured an insulated
pole-clamp or binding post e which with its set screw d projects into the path of
the bolt. The bolt is provided with a groove e which increases in depth inwardly.
A second pole-clamp is arranged and performs the duty of a conductor at the
opposite end of the casing of the bolt.
り
The conducting wires of an electrical circuit are attached to the said clamps or
binding posts e and f of the poles, and into this circuit the alarm mechanisin
inserted in the manner indicated in the diagram. The method of operation of the
safety or protecting device which forms the subject of this invention, at the opening
of the bolt mechanism, is as follows:
When the holt is displaced in the direction of the arrow by turning the
handle of the door, the lower end of the set screw d slides within the groove e of
the bolt and comes eventually in contact with the bolt, before the fastening
device is opened. The connection between e and is thus established by the bolt
and its casing, and consequently an electrical circuit is closed, and the alarm bell
sounded.
It will be understood that the same thing exactly will happen if the bolt be
displaced from the closing plate with a tool by an unauthorized person. Thus
the device herein described affords absolute safety against the surreptitious opening
of the lock or fastening.
In the form of arrangement shown in Figures 3 and 4, the pole-clamps or binding
posts e and are arranged not at the top of the bolt case a hut at the rear-wall of
the same, and, accordingly, the groove è is situated in the side of the surface which
is facing the binding post c.
The method of operation is the same as in the first form of arrangement.
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:
A closing device for doors or the like in which one binding-post c. being

page_text: properly insulated, is secured to the case a, while the other pole-clamp or binding
post also secured to that case, is not insulated and acts as a conductor, and
wherein the set screw d or another extension of the former is adapted to slide
within a groove of the bolt b, which groove becomes deeper in the inward
direction, so that when the said bolt is displaced from the locking plate i, it comes
into contact therewith, so that the circuit which includes the fastening device, is
completed, and an alarum or signalling mechanism, also comprised within such
circuit, is set in operation.
Dated this 28th day of June 1895.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., Agents.