Improvements in Electric Indicators.
Year: 1889

page_text: Date of Application, 7th May, 1889
Complete Specification Left, 30th Dec., 1889-Accepted, 22nd Feb., 1890
PROVISIONAL SPECIFICATION.
Improvements in Electric Indicators.
+4
BENJAMIN CHARLES CROSS CANT 73, Pembroke Road Walthamstow Essex,
Electrician do hereby declare the nature of this invention to be as follows:-
1
The instrument is usually termed an Electric mechanical throw-back or Annunciator.
It is joined in circuit with an Electric Bell and push, the electric current passing
through the two electro-magnets sets free a flag made of brass or other suitable
material, by the attraction of an armature which is made in a peculiar manner.
The
improvement consists of a new form of armature which bears on its outer side a small
lug and a new form of flag having at the apex of a circle a small curved lug which
engages and is supported by the lug on the armature when by a quick motion of the
electric current the lug is disengaged & the flag falls indicating in which room or
place, the circuit has been made. There are various devices for better adjusting the
correspondence of parts.
Dated this 6th day of May 1889.
COMPLETE SPECIFICATION.
Improvements in Electric Indicators.
I, BENJAMIN CHARLES CROSS CANT, of 73 Pembroke Road Walthamstow, in the
County of Essex, 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 :-
My invention relates to an improvement in electrical indicators or annunciators,
and has for its objects, simplicity in the general construction, and greater reliability
in action than is obtained in the case of such instruments as hitherto made and
used.
In order that my invention may be better understood, I have appended the
accompanying sheet of drawings in which Figure 1 is a front elevation of the device,
with the indicating disc or flag released, Figure 2 is a similar view shewing said disc
or flag returned to its normal position, and Figure 3 is an end elevation of the same.
Similar letters of reference are used to indicate corresponding parts in the several
views.
In carrying my invention into effect I employ a single or double pole electro-
magnet A, fitted upon a suitable base B, to which an armature C is pivotted at C, and
is balanced so as to fall back from the poles of the magnet A when no current 18
passing round the coils thereof, a stop D being provided, so that the pin d may be held
by the binding screw e, and thus regulate the stroke of the armature C. The disc or
flag E, pivotted at f is also balanced so as to fall in the position shewn by Figure 1
when released. A bent lug g upon the disc or flag E is arranged so as to engage with
a projection h upon the armature C when the disc or flag E is thrown back as shown
by Figure 2, by the ordinary mechanical or electro-mechanical device, operating upon
the projection :. Upon the passage of a current of electricity round the coils of the
magnet A, the armature C is attracted toward the poles thereof, and the resulting
movement causes the lug g to be released from its locked position upon the projection h,
and the disc or flag E falls by the action of gravity, thus indicating the passage of the
current.
ん
The device as herein described and shewn by the drawings may be used in sets,
corresponding in number to the pushes or other contrivances forming part of a
divided circuit, each division of which requires to be separately indicated or
י

page_text: announced, and such sets may be provided with any suitable mechanism for
the purpose of throwing back the flags after indication, by pressure upon the
projection 1.
Having now particularly described and ascertained the nature of my said inven
tion, and in what manner the same is to be performed, I declare that what I
'claim is,
In an electrical indicator.or annunciator, the combination of an electro.magnet with
a balanced; arinature C, regulator D, d, flag E, with a bent lug 9 and a projection h
upon the armature C, substantially as and for the purposes herein set forth, with
reference to the drawings.
FREDK. WALKER & HYDE,
4, Lattle Moorfields, London, E C., Agents for Applicant