Improvements in Chairs for Railways.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Chairs for Railways.
We, WILLIAM HENRY PLEWMAN, of 26, Spenser Road, and JOHN GRAHAM,
of 35, Spenser Road, both in Bedford, Commercial Travellers, do hereby declare
the nature of this invention to be as follows:-
According to this invention the chair is made in two symmetrical parts, each
part consisting of a base plate and a jaw. That part of each base plate upon
which the rail rests, extends across half the width of the base plate, and a
tongue projects beyond this portion of the base and passes beneath the base
plate of the other part, which is cut away to receive it. By these means the
parts upon which the rail rests are integral between it and the sleeper. A
vertical slot or groove may be made in the jaws to receive a key of wood or
other material; this key is locked in the slot or groove by the head of the rail.
The chairs are fastened to the sleepers by pins which pass through holes in
the base plates. Where one part of the base plate overlaps the other, the
holes in them are so made that driving in the pin tightens up the jaws and
causes them to grip the rail.
2 T
1000
W. H. PLEWMAN,
J. GRAHAM,
Improvements in Chairs for Kallways,
We, WILLIAM HENRY PLEWMAN, of 26, Spenser Road, and JOHN GRAHAM,
of 35, Spenser Road, both in Bedford, Commercial Travellers, 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:--
According to this invention the chair is made in two symmetrical parts, each
part. consisting of a base plate and a jaw. That part of each base plate upon
which the rail rests, extends across half the width of the base plate, and a
tongue projects beyond this portion of the base and passes beneath the base
plate of the other part, which is cut away to receive it. By these means the
parts upon which the rail rests are- integral between it and the sleeper. A
vertical slot or groove may be made in the jaws to receive a key of wood or
other material; this key is locked in the slot or groove by the head of the rail.
The chairs are fastened to the sleepers by pins which pass through holes in
the base plates. Where one part of the base plate overlaps the other, the
holes in them are so made that driving in the pin tightens up the jaws and
causes them to grip the rail.
The drawings illustrate chairs made in accordance with this invention.

page_text: Figure 1 is a plan of the two parts of a chair in position.
Figure 2 is a similar view when the parts are separated.
Figures 3 and 4 are side elevations of the two parts.
Figures 5 and 6 are side and end elevations of the chair with a rail in place.
Figures 7, 8, and 9 are sections on the lines 7, 7, 8, 8, and 9, 9, Figure 1.
Figure 10 shows a chair adapted for use with a guard rail. Figure 11 is a side
elevation of the same with the rails in place.
The chair is made in two symmetrical parts a a, each part consisting of a base
plate and a jaw c. That part of the base plate upon which the rail d rests
extends across half the width of the base plate and a tongue e projects beyond
this portion and passes. beneath the base plate of the other part, which is cut away
at f to receive it. By these means the parts upon which the rail rests are
integral between it and the sleeper.
In each base plate are holes gh and in each tongue another hole ; the
chairs are secured to the sleepers by pins which pass through these holes. It
will be seen from the drawings that when the two parts of the chair are placed
in position the hole h in the base plate of one part does not coincide with the
hole in the tongue of the other part, so that as the pin is driven in, the two
parts of the chair are compelled to grip the rail.
Referring to Figures 10 and 11, each part in this case is made with two
surfaces upon which the rails d and m rest, m being the guard rail. Each
tongue has a slot n through which passes the shank o of an additional part p.
The part has two jaws qr and a hole s through which a pin is driven securing it
to the sleeper. To fix the chair the part is first secured to the sleeper and
then the two parts a a of the chair are secured together as before.
To prevent vibration a key t of wood or other suitable material may be inserted
in a vertical slot u in the jaw c as is shown in Figures 10 and 11. In the same
figures is also shown a strip of wood or other suitable material which may be
placed between the base plate and the tongue c. The key t and the strip
may be applied to an ordinary chair.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is: --
1. A chair formed of two symmetrical parts each consisting of a base plate
,the upper part of which is wholly on one side of the rail and has a complete jaw
for holding the rail and a tongue which passes under the base plate of the
other part substantially as set forth.
2. A chair formed of two symmetrical portions each consisting of one com-
plete jaw, the whole of the upper part of the base plate being on one side of
the rail, half of the lower part of the base plate on the same side of the rail,
half of the base plate beneath the rail and half of the lower part of the base
plate on the other side of the rail.
3. The combination with a chair formed of two symmetrical parts each con-
sisting of a base plate having a jaw for holding the rail and a tongue which passes
under the base plate of the other part of a third part between the other parts
and having jaws on each of its sides for holding the rails in co-operation with
the jaws on the other parts.
4. Railway chairs substantially as described and illustrated in the drawings.
A