Year: 1888

page_text: I WILLIAM MARSHALL of 30 Foundry Street Bury in the County of Lancaster
Engineer do hereby declare the nature of my Invention to be as follows:
Va
My Invention has for its object to provide a suitable and efficient point for
tramways the said point being operated as a trailing point by the wheels of the
vehicles passing thereover. The tongue of the point is of the class which is
centered at its butt end, and moves from side to side in a horizontal plane.
According to my Invention. I form on or fix to the underside of the tongue
of the point a double incline and in the casting underneath the double
incline I place centrally of the lateral path through which the tongue travels a piece
which is correspondingly inclined; or has a rounded head and is pressed upwards by
a. spring.
The said inclined part or rounded head is preferably formed on or fixed to a stem
capable of moving, vertically in a box or casing removably secured in the casting
of the point. The spring normally keeps, the inclined part or rounded head
projecting at the one side or the other of the tongue of the point and in the path of
its travel so that it serves to ensure the tongue being pressed properly home to
either side and secures it in proper position whilst when the vehicle passes the flange
of the wheel by pressing the tongue to one or the other side causes the incline on
one or the other side of the under part of the tongue to depress the inclined or
rounded head so as to allow the tongue to move over it and thereafter the said head is
raised again by the spring and presses the tongue fully home if it be not already home
and retains it in its proper position.
J. H. JOHNSON & Co.,
:47, Lincoln's Inn Fields, London, W.C.,
Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in or Connected with Points for Tramways.
I WILLIAM MARSHALL of 30 Foundry Street Bury in the County of Lancaster
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 has for its object to provide a suitable and efficient point for tramways!
adapted for either right hand or left hand roads the said point being operated as a
trailing point by the wheels of the vehicles passing thereover. The tongue of the
point is of the class which is centered at its butt end and moves from side to side in
a horizontal plane. According to my Invention I provide simple and efficient means
for ensuring the tongue being moved home and retained in position when operated
by the wheels of the passing vehicles.
I will describe my Invention with reference to the accompanying drawings
Figure 1 of which is a side elevation and Figure 2 a plan of a trailing point con-
structed according to my Invention and Figure 3 is a transverse section taken along
the line 1-2 in Figure 2. I form on or fix to the underside of the moveable
tongue A of the point a double incline a a³ or rounded edge or surface and in the
casting underneath the double incline I place centrally of the lateral path through
which the tongue travels a piece B correspondingly inclined or having a rounded
head which is pressed upwards by a spring C.
This inclined part or rounded head is preferably formed on or fixed to a stem-
capable of moving vertically in a box or casing D which may be formed in or
removably secured to the casting E of the point. The spring C normally keeps the
inclined part or rounded head 6 projecting upwards at the one side or the other of the
tongue of the point and in the path of its travel so that by pressing against one or
other of the inclines a or a² as the case may be it serves to ensure the tongue being
pressed properly home to either side and secures it in proper position whilst when the
vehicle passes the flange of the wheel by pressing the tongue A to one or the other side
the inclines a or a' on the under part of the tongue depresses the inclined or rounded
head so as to allow the tongue to move over it and when the vehicle has passed the
said head is raised again by the spring and presses the tongue fully home, if it be not
already home, and retains it in its proper position. It is therefore impossible for the
tongue to remain midway or for it to be bent.

page_text: 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 points for tramways a moveable tongue having double inclined or rounded
surfaces on the underside against which a spring piece situated underneath the lower
side of the tongue is caused to act substantially as and for the purposes hereinbefore
described.
Dated this 11th day of April 1889.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.