Combined Detector, Point Indicator, and Ground Disc Signal for Railways.
Year: 1889

page_text: Date of Application, 16th Jan., 1889
Complete Specification Left, 14th Oct., 1889-Accepted, 30th Nov., 1889
PROVISIONAL SPECIFICATION.
Combined Detector, Point Indicator, and Ground Disc Signal for
Railways.
WILLIAM FREDERICK BURLEIGH, 106 Camberwell New Road London S.E.
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention consists of an improved ground disc signal for use on railways so
arranged as both by day and night to exhibit in its normal position a danger signal,
and in its pulled off position to lock the points and also indicate which way they lie.
This I carry out as follows, I make the disc in its normal or danger position to
cover the part forming the point indicator and preferably when at danger to show in
front a red light or lights only and to be actuated from the signal box by rod or wire
connection. The said disc I arrange to work upwards when being pulled off, so as to
cause it to fall to the danger position in the event of the connections breaking.
When the disc is at the danger position the points are free to be actuated from the
signal box, but the points must be either quite home or quite over before the disc can
be worked to the all right position. In so working the disc to the all right position
it locks the points (as herein after described) and uncovers the part forming the
point indicator, which part is actuated by the points, and lies over either on one side
or the other conditionally on the state of the points preferably exhibiting when the
points are set for the left band road the indicating arm or blade standing over on the
left hand side and showing say a white light on the left side and a red light on
the right side, and vice versa when the points are set for the right hand road.
The disc itself can be glazed red or preferably the coloured glasses arranged to
work up or down inside or outside the part forming the lamp, which part provide
with three lenses, and two reflectors, one lens in the centre at the back set square
with the disc in the ordinary manner for a back light. The reflectors I set obliquely
one on each side of the back lens, I do not fix a front lens central in a line with tho
back lens as in general use but use two front lenses squinting inwards fixed at equal
distances from the centre line these two squint lenses which are used for the danger
signal and for the double night indication conditional on the state of the points, are
set at an angle to the disc pointing inwards toward it, and not parallel to the back
lens, by this means utilizing the one light for the double indication.
One method of locking the points I attach to the part forming the point indicator
below its fulcrum a notched blado which crosses a portion of the balance lever of the
disc, which I so form that unless the points are right home or right over the balance
lever cannot be worked.
Date : 11 T 1000
COMPLETE SPECIFICATION.
Combined Detector, Point Indicator, and Ground Disc Signal for
Railways.
WILLIAM FREDERICK BURLEIGH 43 Angles Road Streatham, S.W. Engineer,
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 consists of an improved ground disc signal for use on railways so
arranged as both by day and night to exhibit in its normal position a danger signal,
and in its pulled off position to lock the points and also indicate which way they lie.

page_text: used and it is obvious that numerous methods of locking, bolting, or pinning the
points can be adopted. I ¡prefer to fix the Ground Discs on tie plates & long
sleepers.
Where one all right indication only is required the part 7 forming the point
indicator can be dispensed with but the detector can still be combined with the
Ground disc.
The chief features of novelty being that the disc works upwards so as to fall to
danger in the event of connections breaking.
Where one all right indication only is required it combines a point lock or detector
with the disc instead of their being separated as in common use.
Where two separate all right indications are required it combines a detector or
point lock with a point indicator and ground disc signal.
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:
1st. A combined detector, point indicator and ground disc signal substantially as
described.
2nd. A combined detector and ground disc signal substantially as described.
3rd. In Ground disc signals working the disc upwards for the purpose specified.
Dated this 14th day of October 1889.
WILLIAM FREDERICK BURLEIGH.