AN IMPROVED ELECTRIC BELL
Year: 1882

page_text: LETTERS PATENT to William Robert Lake, of the firm of Haseltine, Lake,
"
& Co Patent Agents, Southampton Buildings, London, for an Invention of
"AN IMPROVED ELECTRIC BELL Communicated to him from abroad by
Constant François de Redon, of Paris, France.
PROVISIONAL SPECIFICATION left by the said William Robert Lake at the
Office of the Commissioners of Patents on the 23rd November 1882.
WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, and Co., Patent Agents,
Southampton Buildings, London, "AN IMPROVED ELECTRIC BELL "[A com-
munication to him from abroad by Constant François de Redon, of Paris, France,]
The electric bells heretofore employed, for telegraphic and telephonic purposes, or
for public or private communications, are complicated and expensive if it is desired
to keep them in proper order. But by the present invention I provide a simplified
arrangement of considerable strength and easy of construction which occupies less
space than those hitherto used.
In the said improved electric bell, the movable armature, the opposing spring, and
the rod which carries the hammer, are fixed firmly together to constitute one piece
having the form of a very flexible spring which surrounds the electro-magnet; this
spring carries at one part the armature and at another part the hammer designed
to strike the bell; this spring also serves as the interruptor for making and
breaking contact. The whole of the apparatus is carried by the support of the
electro-magnet, between the two bobbins of which passes a rod which supports the
bell. The latter covers the electro-magnet and the operating mechanism in such a
manner that the whole apparatus is very compact and occupies little space.
A convenient mode of carrying the said invention into practice is as follows,
that is to say, an electro-magnet is mounted upon a suitable support in which is
secured a rod carrying the bell; the said electro-magnet, and the operating
mechanism, are enclosed between the said support and the bell. In front of the
poles of the electro-magnet is placed an armature fixed upon a curved spring
attached at both ends to the said support. This spring is cut to allow the
aforesaid rod to pass through it; a tongue or piece is fixed upon the said spring
and is designed to make contact with a screw which is adjustable in a support.
The interruption of the circuit is effected between the said tongue and screw.
The said improved electric bell can be made of any suitable form and size, and
the arrangement of the spring armature is varied in some cases

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Robert Lake in the Great Seal Patent Office on the
23rd May 1883.
WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake & Co Patent Agents
Southampton Buildings, London, "AN IMPROVED ELECTRIC BELL"
A com-
munication to me from abroad by Constant François de Redon of Paris, France
The electric bells heretofore employed, for telegraphic and telephonic purposes or
for public or private communications, are complicated and expensive if it is desired
to keep them in proper order. But by the present invention I provide a simplified
arrangement of considerable strength and easy of construction, which occupies less
space than those hitherto used.
In the said improved electric bell, the movable armature, the opposing spring, and
the rod which carries the hammer, are firmly united to constitute one piece having
the form of a very flexible spring which surrounds the electro-magnet; this spring
carries at one part the armature, and at another part the hammer designed to strike
the sounding part of the bell; this spring also serves as the interruptor for making
and breaking contact. The whole of the apparatus is carried by the support of the
electro-magnet, between the two bobbins of which passes a rod which carries the
sounding part of the bell. The latter covers the electro-magnet and the operating
mechanism in such a manner that the whole apparatus is very compact and
_ occupies little space_
In the accompanying drawing
Figure 1 is a front elevation of the improved electric bell, with the sounding part
thereof removed.
Figure 2 is a horizontal central section of the said bell, and
Figure 3 is a vertical central section thereof.
The remaining figures are bereinafter referred to.
A is an electro-magnet mounted upon a support B in which is secured a rod C
carrying the sounding part D of the bell which covers the electro magnet and the
operating mechanism, and the box or casing E is of circular form and of about the
same diameter as the part D. In front of the poles of the electro-magnet is placed
an armature F fixed upon a curved spring G attached at a, a, and b to the
support B. This spring is cut at c to allow the rod C to pass through it; a tongue
or piece d is fixed upon the said spring and is designed to make contact with a
screw e which is adjustable in the support f. The interruption of the circuit is
effected between the tongue & and screw e. The armature F and its curved
spring G are subjected to a series of rapid oscillations which are communicated to
the hammer M in such a manner that the latter repeatedly strikes the part D.
The distance between the armature and the poles of the electro-magnet is very
slight and the stroke of the hammer is rendered sufficiently great by reason of the 4
speed acquired in the movement of the armature.
I apply the principle of the circular or curved spring to a modified form of bell
shown in Figures 4, 5 and 6, Figure 4 being a front elevation thereof with the
sounding part removed, Figure 5 a horizontal central section and Figure 6 a side
'elevation.
This bell differs from that above described in that the armature F instead of
being attracted by the two bobbins of the electro-magnet A is alternately attracted
by one or the other of the poles of these bobbins.
C
The armature F is mounted upon two pivots g, g, one of which rests upon a
magnet O, Figure 6, and the other is held by a piece h supported by a post k 5
which is screwed at i into the magnet O. The shape of the spring is similar to

page_text: that above described, but instead of being placed horizontally it is placed
vertically; it is attached to the armature F at by two screws. This spring G is
fixed at m to the piece H which carries the electro-magnet. The hammer M is
attached to the spring G at m¹ and is arranged to strike the part D.
The said improved electric bell can be made of any suitable form and size, and
the arrangement of the spring armature is varied in some cases.
Having thus fully described the said invention as communicated to me by my
foreign Correspondent and the manner of performing the same, I wish it understood
that I claim. The improved electric bell constructed according to either of the
modifications described with reference to Figures 1, 2 and 3 or to Figures 4, 5 and 6
of the drawing and characterized by the following distinctive features, that
is to say;
First The combination of the armature, the spring, the hammer-carrying rod
and the interruptor, in such a manner as to constitute a curved spring surrounding
the electro-magnet and carrying the hammer and armature, substantially as
setforth
Second-The arrangement of the sounding part D above the mechanism so as to
enclose the same, substantially as set forth.
In witness whereof I the said William Robert Lake have hereunto set my
hand and seal this twenty third day of May in the year of our Lord
One thousand eight hundred and eighty three.
WITH DODT I AR