Improvements in Apparatus for Moving and Locking Railway Points and Safety Bars.
Year: 1894

page_text: COMPLETE SI MULTICATION.
Improvements in Apparatus for Moving and Locking Railway
Points and Safety Bars.
1, PETER BLACK, of Canterbury Road, Kilburn in the County of London,
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 relates to apparatus for moving and locking railway points and
safety bars the object which I have in view is to render the movements of the parts
smooth and comparatively frictionless, and consequently to lessen the labour
attending their working. I shall describe the arrangements which I adopt for this
purpose, referring to the accompanying drawings in the several figures of which
like parts are denoted by similar letters of reference.
Figure 1 is a plan of the motors for a pair of points and safety bar,
Figures 2, 3 and 4 shew to an enlarged scale the gear for moving the safety
bar, Figure 2 being a side view, Figure 3 an end view and Figure 4 a plan.
Figures 5 and 6 are plans shewing modifications of the gear for moving the points.
R are the main rails T the tongues of the point rails, B the safety bar, P the pull
and push rod, I joint the rod P to one arm of a bell crank lever A, the other arm
of which is jointed to a rod C which is guided under a roller at D and which has
within a slot a pair of rollers E. These rollers engage in the spaces between teeth
formed on a lever arm F to which is attached another arm G jointed to the safety
bar B. Thus when the rod P is pulled or pushed the safety bar B is moved to left
or right, rising in the usual way on the radial arms which carry it, if no wheel of a
train is over the bar. The bar B is linked by a rod H to one arm of a lever J the
other arm of which is linked by a rod K to a lever L having cam shaped arms
moving between a pair of rollers M on radial arms and on the rod N which
connects the two point tongues T. When the safety bar B is moved as above
described the lever I is turned partly round and its cam arms acting on the
rollers M move the rod N and the point tongues T to the one side or the other.
The end portions of the cam arms are circular arcs struck from the centre of the
pivot on which the lever works, so that, when the lever L reaches the end of its
stroke in either direction, no pressure of the rollers M against its arms can tend to
move them.
In the modified arrangement shewn in Figure 5 the rod K is jointed
to a pair of radial arms O carrying rollers M which bear against the cam shaped
arms of a lever L one arm of which is linked to the rod N connecting the point
tongues. In this case the extreme portions of the cam arms of L are circular arcs
struck from the pivots of the arms O, so that no strain on the lever can tend to
turn these arms. In the modified arrangement shewn in Figure 6 the rod which
moves the two point tongues T is made in two parts N' and N each part carrying
one of the rollers M. The ends n' n² of the two parts lie side by side, n¹ passing
through a staple Q on n². The one arm of the lever L (which passes under n¹ n³)
bas two upwardly projecting arcs 11 12 of different breadth and the parts n' n² have
notches of different width into which these arcs enter when the lever is moved to
its extreme positions, thus rendering certain the movement of the one tongue away
from the one main rail when the other tongue is moved close up to the other rail.
Although I have shewn the safety bar B in connection with a pair of points,
obviously the moving gear which I have described is applicable to safety bars
which are not connected to points, but which are often employed in stations to
inform an operator at a distance if a platform be clear or not to admit a train.

page_text: 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 :-
1. For moving a safety bar, gear arranged and operating substantially as described
with reference to Figures 2, 3 and 4.
2. For moving a pair of points, a cam lever acting on rollers on the rod
connecting the point tongues, substantially as described with reference to
Figure 1.
3. The modified arrangement for moving points wherein rollers act on cam arms
of a lever linked to the rod connecting the point tongues, substantially as described
with reference to Figure 5.
•
4. The modification of the arrangement referred to in Claim 2 by providing on
the lever arm, projecting arcs, and dividing and notching the rod connecting the
point tongues, substantially as described with reference to Figure 6.
Dated the 3rd day of February 1894.
ABEL & IMRAY,
Agents for the Applicant.