Improvements in Electric Signals or Indicators.
Year: 1891

page_text: Date of Application, 19th Nov., 1891
Complete Specification Left, 6th Aug., 1892-Accepted, 17th Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in Electric Signals or Indicators.
We, JOHN THOMAS GENT, of Oakleigh, Narbro' Road, and ALWYN WALTER
STAVELEY and ISAAC HARDY PARSONS, both of Hinckley Road, all in Leicester,
in the County of Leicester, Electricians, do hereby declare the nature of this
invention to be as follows :—
Our invention relates to what are known as drop signals or indicators and has for
its object to simplify the construction of such signals or indicators.
In carrying out our invention we preferably form the foundation plate by
stamping the same out of a piece of sheet brass or other suitable metal. The
magnet which is an ordinary horse-shoe magnet having a coil or bobbin upon one
leg is arranged with its poles projecting through an arm bent up from the base
plate in such a manner that the armature, one end of which is arranged as a catch
to support the arm carrying the signal disc is directly acted upon by both poles of
the magnet.
The arinature is also made out of a piece of stamped iron instead of cast iron or
brass as hitherto.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants..
COMPLETE SPECIFICATION.
Improvements in Electric Signals or Indicators.
We, JOHN THOMAS GENT, of Oakleigh, Narbro' Road, and ALWYN WALTER
STAVELEY and ISAAC HARDY PARSONS, both of Hinckley Road, all in Leicester,
in the County of Leicester, Electricians, do hereby declare flie 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 :-
Our invention relates to what are known as drop signals or indicators and has for
its object to simplify the construction of such signals or indicators.
In carrying out our invention we preferably form the foundation plate by
stamping the same out of a piece of sheet brass or other suitable metal. The
magnet which is a horse-shoe inagnet having a coil or bobbin upon one leg is
arranged with its poles projecting through an arm bent up from the base plate in
such a manner that the armature, one end of which is arranged as a catch to support
the arm carrying the signal disc is directly acted upon by both poles of the
magnet.
The armature is also made out of a piece of stamped iron instead of cast iron or
brass as hitherto.
To enable our invention to be fully understood we will describe the same by
reference to the accompanying drawing, in which
Figure 1 is a front elevation of our improved electric signal or indicator,
Figure 2 is a side elevation of the same, and
Figure 3 is a plan.
Figures 4 and are views illustrating the construction of the foundation
plate, and
Figures 6 and 7 are similar views of the armature.
a is the foundation plate which is made preferably of brass and provided with the

page_text: arms b, c, d, e the said arms being respectively formed by bending up the parts of
the foundation plate a represented by the dotted lines in Figure 4 and indicated
by the letters, c, d, el to the positions indicated in Figure 5 which is a side or
edge view of the foundation plate. It will be noticed that the arm is formed by
bending up the part 6 and then doubling it upon itself.
fis the horse-shoe electro-magnet having a coil f¹ upon one leg thereof the said
magnet being carried upon the foundation plate by having its poles 2, f² inserted
through holes formed in the arm band projecting above the same.
g is the armature which is preferably of sheet iron and formed by bending down
the parts of the blank indicated by the dotted lines in Figure 6 to the position
indicated in Figure 7 which is an end view of the said armature. This armature is
pivoted to the foundation plate by means of a screw h passed through holes in the
turned down portions i, i in such a manner that one end of the said armature is
located above the poles of the magnet, whilst the other end is normally held in
contact with the arme of the foundation plate by a spring connected at one end to the
lug upon the armature and at the other to the arm d of the foundation plate. lis
the notch or catch formed upon the armature and designed to support the lever
carrying the signal dise.
m is the said signal disc which is secured to one arm n of a double armed lever
pivoted upon a pino attached to the foundation plate a, the other arm P of the said
double armed lever serving as an abutment against which the ordinary pusher or
rod for lifting the signal disc after it has dropped can act. is a projecting piece
upon the arm n and designed to engage with the catch of the armature to hold the
disc in its raised position and when the disc is dropped to impinge against the arm e
upon the foundation plate to prevent the said disc from falling too far.
With the arrangement hereinbefore described it will be readily understood that
if, when the signal disc is in the position shown in full lines in Figure 1 an electric
current is passed around the coil f¹ of the electro-magnet the armature g will be
operated to disengage the catch / from the projection 9 whereby the signal disc will
drop to the position indicated by the dotted lines in Figure 1. The disc will be
returned to its normal position by pushing upon the arm p.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The manufacture and use of the improved electric signal or indicator hereinbefore
described and illustrated in the accompanying drawing.
Dated the 6th day of August 1892.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.