ELECTRICAL INDICATOR FOR ALARMS AND OTHER PURPOSES
Year: 1885

page_text: I, EDWARD WILLIAM LANCASTER of 1 Maude Villas Rodwell Road East Dulwich
in the county of Surrey, Electrician do hereby declare the nature of my inven-
tion for an ELECTRICAL INDICATOR FOR ALARMS AND OTHER PURPOSES to be as
follows:-
I employ one or a pair of Electro magnets at the ends or longitudingly of which
I suspend by means of a spring a soft iron armature provided with a catch or
bevelled stop piece projecting from it above, or in any suitable position about the
armature is pivited a disc shaped arm having connected to it at any angle a short
crank which crank rests against the catch or stop piece on the armature and hold
up the arm The working is simply, that or a current of Electricity passing or
circulating though the coils of the Electro magnet causes the armature to be
atracted towards the said Electro Magnets releasing the crank from the catch or
stop piece and allowing the arm to fall to its lowest position indicating that the
circuit had been completed To replace the arm and crank to their positions
behind the catch or stop piece a small rod is provided which slides behind the
cranks having pins of suitable length to move the crank, on the rod being pressed
lengthwise the crank is replaced as required.
In order that the armature may always have its same position relative to the
crank and Electromagnet, a slotted piece is provided and fixed over the end of the
armature, the slot being of just sufficient size to permit the armature moving freely
to its required limits only.
In order that my invention may be clearly understood I annex a sheet of
drawings representing an indicator with a pair of Electromagnets and an indicator
with a single Electromagnet made according to my invention, in which the same
letters of reference indicate the same parts in all figures.
Fig. 1 is a front view of a pair Electromagnet Indicator.
Fig. 2 is a side view of same.
Fig. 3 is a front view of a single Electromagnet Indicator.
A A is the Electromagnets above which is suspended the armature B with the
catch or stop piece C, above the armature is pivited the crank D with the arm E
connected, F is the slotted piece and G is the rod with pins for replacing the
crank.

page_text: Electrical Indicator for Alarms and other Purposes.
I EDWARD WILLIAM LANCASTER of 42 Hanover Park Peckham in the county of
Surrey late of 1 Maude Villas in the said county Electrician 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 :-
I employ either one or two small electro magnets with iron cores.-I suspend a
soft iron armature close to the same in a suitable position by means of a flat spring
or pivoted with a counterpoise: This armature has projecting from it a catch or
bevelled stop piece; Above or in any other suitable position adjacent to the
armature I pivot an arm with a flat disc shaped end and having at the opposite
end a short crank which rests against the catch or bevelled stop piece projecting
from the armature as above mentioned -I also provide a machanical replacement
rod with a pin projecting from it, the use of which is hereafter described This rod
is also for connection with one of the poles of a battery. The working of my
Indicator is as follows, on a current of Electricity passing through the coils of the
electro-magnets (by the completion of the battery circuit) the armature is attracted
to them and thus releases the crank which has been resting against the stop-piece.
The arm by the weight of the disc on the one end falls till the crank on the other
end contacts with the pin projecting from the replacement rod which is connected
to the battery and so causes a separate or shunt circuit to be formed through the
crank to the bell which continues ringing until the crank is replaced behind the
stop-piece on the armature and thus breaking the bell circuit. This replacement
is effected by the pressing of a button at the end of the replacement rod or other
.convenient method, causing the pin to replace the crank; as above described.
i
The rod regains its normal position by means of a spring suitably placed. One
rod having the required number of pins may actuate a corresponding number of
cranks.
In order that the armature may always retain its relative position to the crank
and electro-magnets a small slotted piece is fixed to guide it and permitting it to
move only within its required limits.
On the circuit being completed, the disc on the arm falls as above mentioned―
and is seen through the glass face of the case of the indicator, which is suitably
arranged to denote the place communicating.
In order that my invention may be clearly understood, I annex a sheet of
drawings illustrating Indicators and alarms made according to my invention, in
which the same letters of reference denote similar parts in any of the figures.
Fig 1 and 1 are front views with pair of electro magnets the disc's being at
rest and denoting.
Fig. 2 is front view with single electro-magnet.
3 is a combination of Indicator and bell.
5 is part view of completed case showing internal working.
»
4 is an end view of Fig. 1.
"
»
ม
7 is a diagram of the circuits and connections of Fig. 5.
6 is a diagram of circuits for the indicator and the bell.

page_text: A denotes the electro-magnets B the armature C the stop-piece on the armature B
or arm (J), D the crank E the arm carrying the denoting disc, F the slotted piece
for the guidance of the armature G the replacement rod, H the pin I the contact
piece for shunt or separate circuits (in figs. 3 & 5,) J, the spring or counterpoise
for J¹ which is the crank or arm for connecting the separate or shunt circuits to
bell, R is the backboard of Indicator case S the frame carrying the glass front,
T the glass front.
In Fig 6, & 7, K represents the battery L the posh M the Indicator, N the bell
P points of contact of I and J¹.
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
1st Utilization of a single arm and crank combined making an instantanious
drop for indicating the calling place and making contact for the continuous ringing
of the bell until the call has been attended to viz the Indicator disc replaced.
2nd The connecting of the indicator on shunt or separate circuit with the bell.
Dated this 07th day of a 100