Year: 1886

page_text: I ROBERT PRICE of 102 Teviot Street, Poplar, London, E. Electrician, do hereby
declare the nature of this invention to be as follows:-
My Invention has reference to that class of apparatus known as electrical
Indicators, and has for its object the more secure and perfect locking of the
Indicator drop, when the apparatus is at rest, or, in other words, when no electric
current is flowing.
The method which I adopt, according to my Invention is as follows.
In front of an electro-magnet, I fix upon the base, or other convenient part,
a pillar, near the top of which, and at right angles thereto, is a pin to carry the
Indicator drop; and, if desired, a suitable stop or check for the said drop to fall
against, may be added.
The Indicator drop is attached to a slotted quadrant, the curved slot being
carried to a position beneath the fulcrum or pivot of the dial or indicator, where it.
is continued vertically for a short distance, according to the position of the coils of
the electro-magnet. A tongue of metal extends below the quadrant to enable the
indicator to be returned to its norinal position, after a signal has been given.
When the instrument is at rest, the vertical part of the slot in the quadrant is
caught by a pin which is attached to the armature of the electro-magnet, and holds
it securely locked against any disturbance from vibration or sudden shock, but, on
the armature being attracted to the poles of the electro-magnet, the pin aforesaid is
carried down to the curved part of the slot, and by its own weight, the drop then
falls to one side.

page_text: ·
I ROBERT PRICE of 102 Teviot Street, Poplar, London E., Electrician do
hereby declare the nature of my invention for "AN IMPROVED ELECTRICAL DROP
INDICATOR and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :—
.:
My Invention has reference to that class of apparatus known as Electrical
Indicators, and has for its object the more secure and perfect locking of the
Indicator drop, when such apparatus is at rest, or in other words, when no electric
current is flowing.
.
The method, which I adopt, according to my Invention, is as follows, reference
being had to the accompanying Sheet of drawings, in which Figure 1 is a section
of the apparatus complete, Figure 2 a plan and Figure 3 a detached view of the
Indicator drop.
In carrying out my Invention, I fix upon a base plate an electro-magnet A,
having both its poles furnished with extension pieces of soft iron, placed at right
angles thereto, and screwed thereon as shown at C and D. To the pole piece Čis
screwed a stiff spring c to which latter is secured the armature B also of soft iron,
said armature having fixed to its extremity, a short pin or tongue b for the purpose
hereinafter described.
In close proximity to the electro magnet aforesaid, is placed a pillar F, the
extremity of which is furnished with a short spindle, to carry loosely the indicator
drop E, which is screwed into position as shewn at f.
The indicator drop E, is formed as shewn at Figure 3 of a plate of metal pierced
to form a fulcrum near the centre, and having at one side, a disc, the opposite side
being extended into a narrow strip or tongue to allow of the Indicator drop being
returned to its normal position. Beneath the fulcrum is formed a semi circular
slot, one end of which is enlarged as at a and into which slot, takes the short pin
or tongue b aforesaid.
Now, when the instrument is at rest, and in its normal position, the pin b at the
extremity of the armature B, presses, by means of the spring c into the enlarged
part a of the semi circular slot, in which it is held, and securely locked against
disturbance from vibration or sudden shock. On the other hand the moment the
electrical circuit is closed, the armature B is attracted to the pole piece D, the
pin b being brought into the main channel x upon which the disc will then fall
by its own gravity.

page_text: Having now particularly described and ascertained the nature of this Invention
and in what manner the same is to be carried out, what I claim is―
Firstly. An Indicator drop formed and arranged substantially as herein described
and illustrated in the accompanying Drawings.
Secondly. In the device such as referred to in the preceding claim, the use
of a slotted quadrant or semi circular slot, widened at one end, substantially as,
and for the purposes hereinbefore described and illustrated in the accompanying
Drawings,