Improvements in Railway Permanent Way Chairs.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Railway Permanent Way Chairs.
FRANCIS GEORGE HOPKIRK, 4, Belmont Avenue, Strandtown, Belfast,
Ireland, Civil Engineer, do hereby declare the nature of this invention to be as
follows:-
A railway permanent way chair formed in two or more parts so that, when the
chair is in position, the weight of the rail and the vehicles passing over the same
act upon the chair in such a manner that the parts composing the chair retain, the
rail in position and do away with the necessity of the wooden or other keys as
ordinarly used for fixing the rail in position in the chair.
In order that my invention may be better understood, and more particularlý
described, I append one sheet of drawings.
Figure 1 shews the chair and rail in section.
Figure 2 an end elevation of chair and section of rail.
Figure 3 a plan of the chair and rail; the same parts being denoted by the
same lettering throughout.
The chair consists of two parts 6 & c, the part 6 being moveable, and so
constructed, that when a train or engine is passing over the rail a, which is held in
position by the said chair, the rail is retained more securely owing to the moveable
piece 6 being pressed down the inclined plane in the main body of the chair c which
causes the rail to be held securely in position.
The moveable piece b may be constructed in one or more parts.
The parts of the chair may be made of cast iron or other metal, or a combination
of metal and wood.
Deted this 4th day of Max 1906
COMPLETE SPECIFICATION.
Improvements in Railway Permanent Way Chairs..
FRANCIS GEORGE HOPKIRK, 4, Belmont Avenue, Strandtowa, Belfast,
Ireland, Civil 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 :-
A railway permanent way chair formed of two or more parts, so that, when the
chair is in position, the weight of the rail and the vehicles passing over the same
act upon the chair in such a manner that the parts composing the chair retain the
rail in position and do away with the necessity of the wooden or other key as
ordinarily used for fixing the rail in position in the chair.
In order that my invention may be better understood and more particularly
described I append two sheets of drawings.
Sheet No. 1 shows one form of the chair, Fig. 1 showing the chair and rail in
[Price 1

page_text: section through the line a. b. on Fig. 3; Fig. 2 end elevation of chair and section
of rail; Fig. 3 plan of chair and rail. This form of chair consists of two parts B
and C, the part B being moveable and formed so that the bottom part of the rail A
rests on a part of it, and, when the chair is in position, the weight of the rail and
the vehicles passing over the same cause the moveable part B to slide down the
incline on the main body of the chair C, which motion is arrested, and the rail held
securely in position, by the web of the rail being gripped by the jaw of the part C
and the jaw of the part B.
Sheet No. 2 shows another form of the chair, Fig. 1 showing the chair and rail
in section through the line a. b. on Fig. 3; Fig. 2 end elevation of chair and
section of rail; and Fig. 3 plan of chair and rail. This form of chair consists of
three parts B, B', and C; the parts B and B', which are identical, being moveable,
and formed so that the bottom part of the rail A rests on a part of each, and, when
the chair is in position, the weight of the rail and the vehicles passing over the
same cause the moveable parts B and B' to slide down the inclines on the main
body of the chair C, which motion is arrested, and the rail held securely in position,
by the web of the rail being gripped by the jaw of the part C and the jaws of the
parts B and B¹. The parts B and B', when in position, are prevented from move-
ment parallel to the length of the rail, by the surfaces of the parts of them which
slide on the inclines being convex; the surfaces of the inclines being concave
to suit.
In Sheet No. 1 the moveable piece B is shown on the outside of the rail, and in
Sheet No. 2 the moveable pieces B and B are shown on the inside of the rail.
The moveable piece or pieces may be placed either on the inside or the outside of
the rail, the jaw of the main body of the chair C being always on the opposite side
of the rail.
The parts composing the chair may be made of cast iron or other metal, or of a
combination of metal and wood.
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 :-
A railway permanent way chair formed of two or more parts, one or more of
which is moveable, and which I call the moveable part or parts of the chair; and
one of which is secured to the sleeper, and which I call the fixed part of the chair.
The bottom part of the rail rests on a part of the moveable part or parts of the
chair, so that, when the rail is in position in the chair, not only the weight of the
rail but the weight of the vehicles passing over it, causes the moveable part or
parts of the chair to slide down an incline, or inclines, formed on the fixed part of
the chair, which motion is arrested, and the rail held securely in position by the
web of the rail being gripped by the jaw of the fixed part of the chair, and
the jaw, or jaws, of the moveable part or parts of the chair, substantially as
described.
Dated this 2nd day of February 1897.