An Improved Switch for Use in connection with Shop Door Bell Circuits and the like.
Year: 1893

page_text: Date of Application, 27th July, 1893
Complete Specification Left, 8th Mar., 1894-Accepted, 21st Apr., 1894
PROVISIONAL SPECIFICATION.
An Improved Switch for Use in connection with Shop Door Bell
Circuits and the like.
JAMES BARKSHIRE 230 High Street Harlesden N.W. Electrician EDWARD
WRIGHT 19 Greenhill Park Harlesden N.W. Gentleman do hereby declare the
nature of this invention to be as follows:-
This invention consists in the arrangement of a switch that is placed to act in
connection with a door and having this advantage over the old form viz. that the
circuit cannot be left open by an omission when the attendant leaves the shop or
office as it immediately closes when the place is left.
A shows door closed, whereby the bell may be switched off if desired by the
attendant. H flexible spring attached to the door. G small rod (or other means)
to place switch off. C contact for restoring circuit. B moveable lever. D spring
to actuate the lever B. J base of switch. E and F are the terminals.
Dated this 27th day of July 1893.
JAMES BARKSHIRE.
EDWARD WRIGHT.
An Improved Switch for Use in connection with Shop Door Bell
Circuits and the like.
We, JAMES BARKSHIRE, 230 High Street, Harlesden, N.W. Electrician, and
EDWARD WRIGHT, 19 Greenhill Park, Harlesden, N.W. Gentleman, 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 :-
This invention relates to an electric switch arrangement acting in connection
with a door, such for instance as a door opening from a house or back apartment
into a shop, in such a manner that when the door is opened an electric circuit of a
bell or other alarm is closed, this alarm giving notice that the door has been
opened.
We shall describe a switch arrangement according to our invention referring to
the drawing accompanying our Provisional Specification which we may now call
Fig. 1, and to an additional drawing Fig. 2, accompanying this Specification, and
shewing a modified form of the switch.
As shewn in Fig. 1, A represents part of the door in vertical section closed
against the door jamb on which is fixed the switch. B is a metal lever which is
urged downwards by its weight, aided if required by a spring as shewn.
The pivot of this lever is connected to the one terminal E, and a contact stop C,
against which the lever bears when it is free (as indicated by the dotted lines) is
connected to the other terminal F.
On the side of the door is fixed a spring H which allows the lever B to be
pushed up by a rod G, and holds it up, the electric circuit being thus kept open.
But when, by opening the door, the spring H is withdrawn from under the lever,
it drops making contact with C and thus closing the alarm circuit.
In the modified form of switch shewn with its cover removed in Fig. 2, the parts
corresponding to those shown in Fig. 1 are denoted by like reference letters. An
D_...

page_text: arm of the lever B is extended so as to project beyond the case as a handle by
which the lever may be moved out of contact with F to be engaged on the
-spring H.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, we declare that what we
claim is :-
An electric switch arrangement connected with a door and alarm circuit, substan
tially as and for the purpose set forth. -
Dated this 13th day of February 1894.
ABEL & IMRAY,
Agents for the Applicants.