An Improved Electric Bell.
Year: 1899

page_text: Date of Application, 13th Oct., 1899
Complete Specification Left, 12th July, 1900-Accepted, 18th Aug., 1900
An Improved Electric Bell.
I, ROBERT BOWMAN, of Plessey Checks, Cramlington, R.S.O., Mining Haulage
Erector, do hereby declare the nature of this invention to be as follows:-
At the
My invention relates to the manner in which I construct and arrange a spindle
or rod having a motion at a suitable angle to the motion of an armature, the
I then con-
spindle or rod I connect to the said armature in a suitable manner;
struct the aforesaid spindle or rod so as to project through and beyond a case
or box containing a magnet or magnets and the aforesaid armature.
point where the aforesaid spindle or rod protrudes through the aforesaid case
or box I form a recess or gland box; in the said recess or gland box I con-
struct and fix a diaphragm which I make of a suitably flexible material, I so
construct the said flexible diaphragm to embrace the aforesaid spindle or rod.
At or towards the end of the aforesaid spindle or rod I construct a knob or
hammer so as to strike a bell or gong when electrical contact is made with the
aforesaid magnet or magnets.
My invention further relates to the manner in which I construct and make a
suitable connection within the aforesaid case or box containing the magnet or
magnets and armature and having moveable electrical contacts arranged to
produce a trembling, or a single stroke action.
I then construct a spindle or rod and fix to the aforesaid moveable electrical
contacts at a suitable angle and to project through and beyond the aforesaid
case or box containing the aforesaid magnet or magnets and armature.
At the point where the aforesaid spindle or rod protrudes through the afore-
said case or box I again construct and make a recess or gland box and flexible
diaphragm with cover or case in the manner aforesaid. Or I may construct and
make the aforesaid connection and the aforesaid moveable electrical contacts
in a seperate case or box so arranged and fitted with the aforesaid spindle or
or cover as and in
rod, recess or gland box, flexible diaphragm, with case
the manner aforesaid and make electrical connection with the aforesaid magnet
or magnets.
L
dove of October 1800

page_text: An Improved Electric Bell.
I, ROBERT BOWMAN, of Plessey Checks, Cramlington, R.S.O., Mining Haulage
Erector, 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: --
The present invention relates to an improved electric bell and is particularly
adapted for use as a mining bell as owing to its peculiar arrangement and con-
struction the whole of its working parts can be enclosed within a water and
dust or dirt tight case, and further it may be used as desired either as a single
stroke bell or as a trembling bell.
In the accompanying drawing which illustrates one form my invention may
assume:-
Figure 1 is a view in back elevation, with the covering plate removed.
Figure 2 is a sectional view on line of Figure 1, and
Figure 3 is another sectional view on line y-y of Figure 1.
Throughout the views similar parts are marked with like letters of reference.
Within a suitable box or case A, preferably cast one with an arm to
carry the gong or bell X and closed by a packed backing plate a is mounted an
clectro-magnet B, whose armature Crocks on pivots in bearings carried by
the case A but insulated therefrom. The armature C. is provided with a con-
tact spring C making contact with the screw of a terminal G and an arm (³
carrying at its free end a pivotting pin D which carries one end of the hammer
rod E. The hammer rod E passes through a gland box F and terminates at its
upper end in an adjustable knob or hammer e. The gland box F is made in
two parts as shown so as to carry a diaphragm f of rubber or other flexible
material which is securely fixed to the hammer rod E by means of a clamp f¹
or in any other suitable manner.
To limit the downward vertical movement of the hammer rod E it may be
provided on its upper part with an adjustable nut'e¹ preferably formed as shown
to carry a buffer piece e² of rubber or the like.
Mounted within and on ene side of the case is a switch so arranged as to enable
the bell to be rung as a single stroke or as a trembling bell. One of the bell
terminals carries or is connected with a pin or projection H on which is mounted
a rocking piece or finger I, whose lower end is adapted to make contact either
with the terminal G so as to render the bell a trembling one or with a ter-
minal G which is connected directly with the electro-magnet and so enables
'the bell to be used as a single stroke one.
The desired movement of the contact finger I may be produced in any suitable
manner, a convenient method is to cause the movement by a push rod "K, whose
inner end is slotted to engage a pin on the upper end of the finger I and its
free end terminates in a button outside the case. This rod passes out of
the case through a gland box L constructed in a manner similar to that of the
previously described box F, that is to say, it is formed in two parts and carries
a diaphragm of rubber or other flexible material which is securely fixed at
or about its centre to the rod K in any suitable manner. It will thus be seen
that on pushing or pulling the button & the finger I will fulcrate on the pin H
and make contact with either one of the terminals G, G¹.
It will be understood that if a metallic case is used, provision must be made for
properly insulating all parts mounted thereon from electrical connection with
each other.

page_text: It will thus be seen that on coupling up and including the bell in an electrical
circuit in the usual well-known manner and operating the button k the bell
may be caused to ring either as a single stroke or as a trembling bell.
It will also be seen that owing to this construction, no water, dust or dirt
can possibly penetrate into the interior of the box or case and prevent the bell
from working.
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 comprising an electro-magnet having a rocking armature
adapted to impart a sliding movement to the hammer rod, as set forth.
(2) In an electric bell as specified in Claim 1, enclosing the working parts
within a water tight case and providing thereon a gland box through which
the hammer rod or other moving part works, the said gland box holding a
flexible diaphragm to which the said moving part is securely fixed, as set forth.
(3) In an electric bell as specified in Claim 1, the use of a switch or other
device whereby the bell may be used either as a single stroke or as a trembling
one, as set forth.
(4) In an electric bell as specified in Claim 1, enclosing the working parts
within a water tight case, as set forth.
(5) An electric bell constructed and arranged substantially as herein before
described and shown.
Dated this in day or
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I.Mech. E.,
Chartered Patent Agent,
70, Chancery Lane, London, W.C.,
Agent for the Applicant.