IMPROVEMENTS IN APPARATUS FOR WORKING ELECTRIC BELLS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
"
I, JOHN HENRY JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of said Invention for "IMPROVEMENTS IN
APPARATUS FOR WORKING ELECTRIC BELLS which Invention has been communi-
cated to me from abroad by Philip George Skrivanow of Paris in the Republic of
France to be as follows:-
This Invention relating to Apparatus for working Electric bells consists in
certain improvements in the construction and arrangement of the parts as herein-
after described.
In an Apparatus for working electric bells according to this Invention one or
more batteries preferably constructed as described in the Specifications to Letters
Patent No 489 datod January 31st 1882 and No 4460 dated Sept 19th 1882 are
arranged behind or under the bell being contained or imbedded in the thickness
of the board or support to which the bell is attached. These batteries supply
electricity to a single coil or bobbin constituting an electro magnet and provided
with a spring armature connected to a haminer acting on the bell. This armature
oscillates or vibrates in proximity to a contact connected to the battery and
consisting of an adjustable screw the extremity of which is placed opposite a
spring attached to the armature. The circuit is open when the spring on the
armature is out of contact with the screw and is closed when the spring touches
the screw. The interruptions thus produced in the current cause the hammer to
vibrate and ring the bell. The adjustment of the screw or contact maker of the
interrupter is effected from the back of the board or support.
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, London, W.C.

page_text: COMPLETE SPECIFICATION.
I JOHN HENRY JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of this Invention for-"IMPROVEMENTS IN
" which Invention has been communi-
cated to me from abroad by Philipp George Skrivanow of Paris in the Republic of
France and in what manner the same is to be performed to be particularly described
and ascertained in and by the following stateinent:-
APPARATUS FOR WORKING ELECTRIC BELLS
This Invention relating to apparatus for working Electric bells consists in certain
Improvements in the construction and arrangement of the parts as hereinafter
described.
According to this Invention the battery or batteries employed to operate the
apparatus and sound the bell is or are arranged underneath or behind the bell
preferably so as to be enclosed in or covered by the board or support upon which
the bell and the apparatus connected therewith are carried, a single bobbin or coil
being employed to actuate the armature of the hammer and means being provided
for effecting the adjustment, for regulating the sounding of the bell from the back
of the board or support aforesaid.
And in order that the said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed Sheet of Drawings, the same letters of reference
indicating corresponding parts in all the figures.
Figure 1 of the accompanying drawings is a front elevation of the apparatus,
the bell being removed, and figure 2 is a vertical Section shewing the bell in
position.
A battery or batteries B preferably constructed as described in the Specifications
of Letters Patent N° 489 dated the 31st day of January 1882, and N° 4460 dated
19th September 1882, is or are arranged behind or under the bell T, the said battery
or batteries being carried by or contained or embedded in the substance of the
board or support A to which the bell is attached. This battery supplies, or these
batteries supply, electricity to a single coil or bobbin C wound around a soft iron
core and constituting an Electro-magnet, and provided with a spring armature D
carrying a hammer M for striking the bell T. The pole pieces of the core at e
should be brought into sufficiently close proximity to the armature D, which may
be effected by making them of a disc form as shown. The armature D oscillates
or vibrates in proximity to a contact piece connected to the battery or batteries
and consisting of an adjustable screw a, the extremity of which is placed opposite
to, and so that it is operated to make and break contact with, a spring b, attached
to the armature D. The circuit is open when the spring b is out of contact with
the screw a, and is closed when the 'said spring touches the said screw.
interruptions thus produced in the current cause the hammer to vibrate and ring
the bell, when a push piece or other closing device is operated to complete the
battery circuit. The adjustment of the screw or contact maker a of the interrupter,
to regulate the sounding of the bell is effected from the back of the board or
support A, as will be clearly seen by reference to the drawing.
The

page_text: It will be evident that the apparatus as a whole may be in any suitable position,
a relative placement of the parts as hereinbefore described being retained.
I do not limit myself to the use of the particular battery hereinbefore men-
tioned, although it is I believe the one best suited to the purpose, but any other
suitable battery can be used.
Having now particularly described and ascretained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
First. In electric bells, arranging a battery or batteries for producing the current
behind or under the bell proper and enclosed in or carried or covered by the board
or support of the bell, substantially as herein before described and illustrated in the.
accompanying Drawings.
Second. In Electric bells, the arrangement of coil wound upon a soft iron core
with projecting or disc-like pole pieces, for enabling the employment of a single
bobbin or coil for working the hammer of the bell substantially as herein before
described and illustrated in the accompanying Drawings.
Third. The general arrangement and combination of parts constituting the
apparatus for working electric bells, substantially as bereinbefore described and
illustrated in the accompanying Drawings.