Improvements in Electric Bells.
Year: 1898

page_text: Date of Application, 7th Feb., 1898-Accepted, 12th Mar.,
1898
Improvements in Electric Bells.
I, PAUL JENISCH, of 34, Prinzen Strasse, Berlin, in the Empire of Germany,
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 :-
This invention relates to an electric bell which differs from the known forms by its
great simplicity and the small number of separate parts. The special feature of this.
bell consists in the fact that the dome of the bell is supported upon a stand which at
the same time forms the core of the electro-magnet.
In the accompanying drawing:
Figure is a longitudinal section through my improved bell,
Figure 2 is a plan view of the same, and
Figure 3 shews a modified form of electro-magnet.
The support or board a is of wood or other non-conducting material, and in order
that this support may be readily attached to the wall it is provided with an eye or
eyes a¹. Upon the board a is fixed by means of screws 61 a small bracket or bridge
piece which supports a rod c of iron or other material capable of magnetisation.
An electro-magnetic bobbin d wound with wire is passed upon this rod and rests upon
the bracket. The rod, which thus forms an electro-magnet core, is provided above
with a shoulder and a screw-threaded portion c² for the reception of the bell f which
is fixed upon the rod c by means of a nut e. Instead of the screw c² and nut e,
any other suitable means may be employed for fixing the bell.
The lower end c¹ of the electro-magnet core passes through the bracket b, so that
the armature g is attracted by the core c¹ when an electric current passes through
the bobbin d and magnetises the said cores c c¹. The armature g is provided at its
outer or free end with a knob g' which strikes against the bell when the armature
is attracted. The other end of the armature is attached by means of a flat spring i
to a support h in order that the armature may be free to effect the necessary
oscillations. This support h is in direct communication, by means of a short strip k,
with a binding screw m with which one of the wires of the electric circuit is
connected. A second binding serew n, which is connected with the other wire of the
electric circuit, conducts the current by means of the strip u to a. binding screw n¹ to
which one of the wires t of the bobbin d is connected, whilst the other wire 8 of the
bobbin is in communication with a plate r which is provided with a flat spring p
having a contact point p¹, so that this contact point bears against a small platinum
plate upon the underside of the armature g. The strips or straps and u obviate
the necessity for the wires t and 8 passing out from beneath the bell, which
arrangement is advantageous and convenient.
The manner of operation of this device is readily apparent. When the electric
current passes from the conductor through the binding screw n, it proceeds through u,
n and t into the bobbin d, passes round this bobbin and into the plate r from
which it flows through p, p¹ and g into the block h and through k to the other
binding-screw m. The core c becomes magnetised and its lower extremity c¹ attracts
the armature g, thus causing the knob g¹ to strike the bell. When this takes place,

page_text: however, the electric current between p¹ and g is interrupted, the armature g falls
thereby again establishing electrical communication between p¹ and g¹ and so on in
succession.
As shewn in Figure 3, instead of employing a single core c and bobbin d, two or
more cores c, c and bobbins d, d may be used in order to increase the power of
attraction. In this form of electro-magnet the cores care connected one with another
by means of a plate c³.
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 :-
1. An electric bell in which the electro-magnet (c) serves at the same time as the
support for the dome (f) of the bell.
2. An electric bell, in which two or more electro magnet cores (c) serves as supports
for the dome (f) of the bell.
3. An electric bell, in which the electro magnet core or cores (c) are supported upon a
bracket or bridge (b) and with the lower end (c) attract the armature (9) the outer
end or knob (¹) of which strikes against the edge of the bell (f).
4. An electric bell of the kind described in Claims 1, 2 and 3, in which the binding
screws (m, n) for the conducting wires are, so to speak, continued by means of strips
or bands (ku) to beneath the dome of the bell in order to obviate the necessity for
projecting conducting wires.
5. An electric hell in which the armature is arranged beneath the core or cores
which serve as supports for the dome, and in which beneath the armature a contact
spring is provided which upon the attraction of the armature interrupts the electric
current.
1000
Dated this 7th day of February 1858.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.