Improvements in or connected with Telephones and Electric Bells.
Year: 1891

page_text: Date of Application, 26th May, 1891
Complete Specification Left, 26th Mar., 1892-Accepted, 30th Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in or connected with Telephones and Electric Bells.
We, JAMES FREDERICK BENNETT, of Rupert Road, Sheffield in the County
of York, Manufacturer, and ERNEST PARKER HIDES, of Violet Bank Road,
Sheffield aforesaid, Manufacturer, do hereby declare the nature of our invention to
be as follows:-
This invention relates more particularly to the construction of selfcontained
portable telephones, in which any suitable kind of battery may be used, but pre-
ferably one or more composed of carbon slabs placed in zinc cases, and filled with
One of
a solution of plaster of Paris and salammoniac, and scaled with cement.
the chief objects is to produce an instrument of very compact form, and constructed
so that the lid can be taken off, the batteries taken out and replaced by new ones,
and the connections made with certainty by a person having no knowledge of the
instrument.
This is accomplished by a system of spring connections, thus when the battery
(or batteries) are put in the outer case, the zine case presses against a spring con-
nection making the contact with the negative pole, and also acting as a retainer to
prevent the battery moving about in case.
There are three spring contacts, and we prefer to fix them upon the underside of
lid, so that they will be lifted off and replaced, without being otherwise detached
or separated.
The upper contact goes to earth through the bell, the middle contact represents
the line, its spring action causing it normally to bear upon the upper contact, thus
leaving a clear circuit through the bell. On pressing the push button, the bell
circuit is broken and contact is made with the lower spring, which bears upon the
positive pole of battery.
This apparatus may be altered in form so as to be fixed against a wall or the
like.
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.
COMPLETE SPECIFICATION.
Improvements in or connected with Telephones and Electric Bells.
We, JAMES FREDERICK BENNETT of Rupert Road, Sheffield, in the County
of York, Manufacturer, and ERNEST PARKER HIDES, of Violet Bank Road,
Sheffield, aforesaid, Manufacturer, 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 more particularly to the construction of self contained
portable telephones and electric bells in which any suitable kind of battery may be
used but preferably one (or more than one) composed of carbon slabs placed in
zinc cases and filled with a solution of plaster of Paris and sal-ammoniac and sealed
with cement and having the contacts made automatically by spring pressure of the
parts together.
We have illustrate a portable telephone and bell made according to our
invention, in the annexed sheet of drawings, in which,
Fio is a front elevation.

page_text: ig. 3, plan with lid removed.
Fig. 4, underside of lid with spring contacts.
Fig. 5, a modification of the arrangement.
Similar letters of reference indicate similar parts in any of the figures.
As the object is to produce an instrument of a compact form, we make a simple
case A, preferably rectangular, but it may be of other shape if desired, having a
lid B, that can be removed when desired by unscrewing or the like for the purpose
of examining or replacing the batteries C, C¹.
The bell is marked J, the receiver and earphone H, the push K, terminals L,
earth L', and carrying handle M.
Also
The various electrical connections are so constructed that when the battery or
batteries are placed in the case the zinc casing of the battery C, will press against
a spring connection D, attached to the case A, making the contact with the
negative pole, (and with spring connection R, when two batteries are used) also
acting as a retainer to prevent the battery moving about inside the case.
when the lid is replaced after being removed the spring connections E, F, G, affixed
thereto will form contact with corresponding parts. The middle contact E,
represents the line," its spring action causing it to bear normally upon the upper
contact F, and thus leaving clear circuit through the bell J.
On pressing the push button K, the bell circuit is broken and contact is made
with the lower spring contact G, which bears upon the positive pole P, of the
battery C.
The earphone or receiver H, is hung by its metallic ring upon the two hooks
which are connected with both ends of the telephone wire W, and W₁, and also
placed in line circuit, thus when the earphone H, is on the hooks the coils of
earphone are cut out by short circuit and the bell may be rung without ringing
through the resistance of said earphone coils.
We wish it to be understood that although we have shown in F. 1, 2, 3, 4, the
arrangement of the various parts that we prefer, we may var, the position as
illustrated in Fig. 5, in which the bell J, is shown on the top of case, a door Q. at
the side instead of a lid B, at the top, and push button at the side.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1-The combination of a-magneto telephone, bell, dry battery and terminals,
arranged to form a portable instrument having no other connection than the "line
and "earth."
2-A self contained or portable telephone and bell consisting of a case A, con-
taining one or more batteries C, with push K, earphone H, bell J, terminals L,
and spring contacts E, F, G, constructed and arranged substantially as hereinbefore
described and illustrated.
3-In a portable telephone the spring contacts E, F, G, and the hooks I, for
earphone arranged and operating substantially as described and shown or in an
equivalent manner.
4-In a portable telephone, constructing the connections D, and R, of the
batteries of a spring form, so that they are automatically connected or brought into
contact by pressure when simply placed in position.
Dated the 24th day of March 1892
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicants.