IMPROVEMENTS IN ELECTRIC BELLS
Year: 1884

page_text: "
PROVISIONAL SPECIFICATION.
"
I, AMBROSE MYALL, of 21 Cockspur Street, Charing Cross in the County of
Middlesex, Civil Engineer, do hereby declare the nature of the invention for
IMPROVEMENTS IN ELECTRIC BELLS (communicated to me from abroad by
Messrs E. Recordon et Compagnie, of Geneva in the Republic of Switzerland,
Electricians to be as follows:-
:-
The improved electric-bell hereinafter described unites all the conditions necessary
for good and reliable working.-It has the smallest possible size, and very elegant
form-All the parts are fastened on one metal plate, the employment of wood
being carefully avoided, so that the dampness of walls or change of temperature
cannot have any bad effect upon the mechanism, as is the case with electric bells
of ordinary construction.-The cost of manufacture can be reduced to a minimum,
on account of the simplicity of the mechanism; and also because the expensive
wood or sheet metal box covering the mechanism is wholly dispensed with, and
the bell itself substituted for such wooden or metal box. The regulation of the
mechanism is extremely easy, and can even be effected without unscrewing the
covering bell-The accompanying drawing shows the two principal elevations.―
In the front elevation (Fig. 2) the bell, and the bell carrier are indicated by dotted
lines, in order to display the parts below. For the same reason the bell in the
side elevation (Fig. 3) is represented in section. Fig. 1 is a perspective view of
the metal plate, which, cast in one piece, forms at a the carrier of the electro-
magnet, with the bell carrier a¹; At 6 the carrier of the spring of the armature so
that the screwing on of special parts to form the carriers is avoided.--At a c¹
(Fig. 2) holes are bored in the plate, to hang the apparatus up-Near these holes,
the terminals d. d¹ are fixed into and insulated from the plate.-Below the
terminal d is fixed a metal strip e, carrying on its free upturned end a spring g,
fixed by a screw f-The electro magnet h consisting of an iron bobbin formed by
a hollow core and round plates fixed on the ends of the core, with flats filed on to
form the poles, is the same as that described in the specification accompanying the
Letters patent granted to E. F. Recordon, bearing date October 9th 1883, No. 4800.
To fasten this electro magnet on its carrier a, one screw i is sufficient, passing
r

page_text: through the hollow core, and having its end screwed into a. The carrier 6 supports
the spring 1, fixed to it by screws m. m.-The other end of this spring is connected
by screws n. n. to the armature o, the latter carrying on its rear end the curved
wire of steel, iron, or brass, with hammer head 8, which is placed near the lower
rim of the bell.-The spring g is in contact with the armature o, or rather with its 5
spring at u, when the armature is not attracted by the electro-magnet h.-The
end of the wire of the bobbin of the electro-magnet is fixed by a screw / to the
carrier 6 of the armature, and the other end is connected to the terminal -
The mode of supporting the bell is shown in Fig. 3.-The projection a¹ of the
carrier a, has the screw y rivetted or otherwise securely fastened to it-On this 1
screw, the bell can be fixed at any convenient height, by means of the nut &, and
back nutz-Fig. 4 shows the mode of attaching and insulating the terminals d. d'.
-The holes in plate k are bushed or lined by a ring p, of ebonite, leather, or other
insulating material, projecting at the rear side of plate k. A second ring of
ebonite p is placed on the front of plate k, and a screw q passing through both 1
these rings, enters into the body of terminal d, screwing the whole tightly together.
-The hole w is provided to receive the wire from the battery and screw q¹ is
employed to fix it therein.-The rings p. p. as stated above, project at the rear, to.
"keep the plate k free from the wall. For the same purpose, a third such ring is
provided below, as indicated in Fig. 1 by the oval in dotted lines.-The working
of the mechanism is the same as in ordinary electric bells.-The current entering.
at d, passes through e and spring g, over the contact point at u into the spring 7,
thence through wire into the bobbin, and through to the other terminal d¹;
whereby the armature is attracted, and the contact at u is broken.-The armature
is immediately set free, so that the contact at u is re-established, and the same
action repeated, whereby the hammer 8 continuously strikes the bell t.
ith dow of Sentember 1884

page_text: insulating material projecting at the rear side of the said plate, a second insulating
ring p¹ is placed on the front side of the said plate, and the said rings are secured
by a screw 9, passing through both of them and entering into the body of terminal d,
thus securing the whole tightly together. The hole w, is provided to receive the
wire from the battery and a screw q' is employed to fix it therein. The rings P, P
as just stated, project at the rear to keep the plate free from the wall, or other
object to which it may be attached, and a third such ring p* is provided below for
the same purpose as shewn in Figs 2 and 3.
The action of the apparatus is as follows: the electric current entering at d,.
passes through plate e, spring g and contact point u, into spring 1, thence through
wire v, into the electro-magnet and from thence to the terminal d¹.
The armature o is thus attracted to the pole plates of the electro-magnet and the
contact at u is broken.
The armature is immediately set free, so that the contact u is re-established and
the same operation is repeated, whereby the hammers repeatedly strikes the
bell t.
My improved electric bell as above described, unites all the conditions necessary
for good and reliable working-It is very compact in size and elegant in form, all
the parts are attached to one metal plate, the employment of wood being carefully
avoided, so that the dampness of walls or changes of temperature cannot have any
injurious effect upon the mechanism, as is the case with electric bells of ordinary
construction.
The cost of manufacture can be reduced to a minimum, on account of the
simplicity of the apparatus, and also because the wooden or sheet metal box,
covering the mechanism is dispensed with, the bell itself answering such purpose.
The regulation of the mechanism is extremely easy, and can be effected without
removing the bell.
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. In an electric bell, the combination of the plate k, having the parts a a¹ and b,
cast in one piece therewith; the bell adjustably secured to the part a¹; the electro-
magnet secured to the part a; the armature and its spring secured to the lug b;
the hammer attached to the armature; the contact spring g, secured to the
terminal d; and the terminal d¹; all constructed and adapted to operate sub-
stantially as described and shewn.
2. The combination in an electric bell of the armature o, and its spring 1, parallel
to the axis of the electro-magnet h and carrying a hammer; the plate e, bearing a
contact spring and secured to the terminal d and support k, substantially as
described and shewn,
DL: TOLL Jan Tun 1995