A COM- BINED ELECTRIC-BELL AND PENDULUM-INDICATOR
Year: 1885

page_text: I, ALFRED FORD LLOYD, of Reliegh Road, Enfield Town, in the County of
Middlesex, Electrician, do hereby declare the nature of my invention for A COM-
BINED ELECTRIC-BELL AND PENDULUM-INDICATOR and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement:-
Hitherto electric-bells have been constructed with separate indicators, but my
invention is designed to effect an important improvement, by combining the
indicator with the bell, and. thus rendering the use of a separate indicating
apparatus unnecessary.
My invention therefore not only simplifies but also greatly decreases the cost, of
electric-bell service.
My combined Electric-bell and Pendulum-indicator consists of a Pendulum-
indicator attached to an electric-bell of ordinary appearance, but having the
following modifications in detail.
1-The frame or back plate (K) of my bell is constructed of brass or bronze, by
means of which I greatly increase the power of the magnets employed.
2-At the back of the bell-plate (K) are several projecting studs so arranged as
to leave room behind the said plate for the swing of the pendulum.
.
3-My electric-bell requires only a single coil (L) instead of a double coil as
usually employed.
4 Above and below the coil I place two pieces of soft iron (A) one of which is
bent round each end of the coil (L) so as to embrace the said coil on both sides.
These pieces of soft iron are so placed that when the current is turned on they
become a double magnet, one side of which attracts. the armature of the bell-
hammer (B) while the other attracts the armature of the pendulum (C).
5-On the alternate side of the coil to that where the bell-hammer hangs I con-
struct a projecting arm (G) which supports one of the bearings (E) on which the
pendulum-indicator (P) swings.
The other bearing is attached to the back plate of the bell.
Attached to the pendulum-indicator (P.) is a short spindle of V shaped section
the ends of which rest on the bearings (E) above described, in such a way as to
rock freely in either direction.
The pendulum-indicator (P) is, as before said, attached to this short spindle.

page_text: Above is a bent wire carrying a balance weight (W) by means of which the said
pendulum-indicator can be adjusted or balanced with nicety so as to swing easily.
Below the spindle is the armature of the pendulum (C) and from its lower end
extends downwards a wire which carries at its lower extremity a suitable disk or
button made of china, glass, metal or other material and painted if preferred with
Juminous paint.
This wire after leaving the said armature passes behind the back-plate (K) so as
to find ample space for swinging to and fro unimpeded.
When the electric current passes through the coil the armature (B) of the
hammer vibrates by means of the contact breaker in the usual way.
At the same moment the armature (C) of the pendulum is also attracted by
the magnets at the opposite side of the coil, where it remains in contact, until
the current ceases, when the armature (C) is released, and this release causes the
pendulum (P) to commence swinging on the bearings (E) which it continues to do
for several minutes.
In the accompanying drawings the same letters represent the same parts
throughout.
Figure 1-represents a front view of my combined Electric-bell and Pendulum-
indicator.
I wish it clearly understood that I do not confine myself to the precise arrange-
ment described, as my apparatus is susceptible of variation in the arrangement of
its different component parts.
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. The combination of an Electric-bell and Pendulum-indicator, wherein the
Pendulum-indicator is set in motion by the Electric current substantially as set
forth and described.
2. An electric-bell constructed on a brass or bronze frame, and having a single
coil with double magnets as herein explained.
3.-A Pendulum-indicator suspended on suitable bearings with a balance weight
and an armature, and carrying a conspicuous disk or button which may be coated
with luminous paint, substantially as herein described and set forth.
Dated this 18th day of November 1885.