Improvements in Keys for Railway Chairs.
Year: 1897

page_text: Date of Application, 9th Dec., 1907
Complete Specification Left, 7th Sept., 1898-Accepted, 8th Oct., 1898
Complete Specification Left, 7th Sept., 1898-Accepted, 8th Oct., 1898
PROVISIONAL SPECIFICATION.
Improvements in Keys for Railway Chairs.
I, DAVID WATT CUTHBERT, of 4, Hamilton Terrace West, Partick, in the
County of Lanark, North Britain, Engineer, do hereby declare the nature of
this invention to be as follows, that is to say:-
-:
My said invention has for its object to render the wooden keys of railway
chairs less liable than heretofore to become loose; and it consists in shaping
a wooden key with a slight concave curvature on the side to bear on the web of
the rail and with a similar convex curvature on the outer side or that bearing
against the jaw of the chair. The key may be parallel in form or it may be made
with a slight taper one end being slightly smaller than the other. The key is
of a size to fit the space between the chair jaw and the web of the rail so as to
be more or less straightened when driven into its place; and saw drafts may be
formed in its convex side or in its concave side or in both when the wood of which
it is made is not otherwise sufficiently pliable to admit of its being driven into
its place. When in place the key is kept tight by its elastic tendency to return
to its curved form, and that tendency keeps it tight even when shrunk to some
extent by drying. Two half keys with their curvatures reversed may be combined,
being held together, for convenience in handling, in any convenient way.
Dated this Seventh day of December 1897.
EDMUND HUNT,
Applicant's Agent.
Improvements in Keys for Railway Chairs.
I, DAVID WATT CUTHBERT, of 4. Hamilton Terrace West, Partick, in the
County of Lanark, North Britain, 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, that is to say:-
-
My said invention has for its object to render the wooden keys of railway
chairs less liable than heretofore to become loose: and it consists in shaping
a wooden key with a slight concave curvature on one side and with a similar
convex curvature on the other side.
And in order that my said invention and the manner of performing the same
may be properly understood I hereunto append a sheet of explanatory drawings
to be hereinafter referred to and showing an example of my improved railway-
chair key and its application.

page_text: Figure 1 of the drawings is a plan of the key and Figure 2 is an end eleva-
tion. Figure 3 is a horizontal section showing the key in position holding a
rail in a chair. Figure 4 is a section of a key differing slightly in form from
that shown in Figures 1 and 2. In these drawings the same reference letters
are used to mark the same or like parts wherever they are repeated.
The improved key, A, is made with a concave curvature, B, on one side and
with a similar convex curvature, C, on the other side. As shown in Figure, 3,
the key, A, is placed with its concave side, B. against, the web, D, of the rail,
its convex side being against the inside of the jaw, E, of the chair, F.
In cases,
however, in which the chair jaw, E, is of suitable breadth, the key, A, may be
placed with its convex side, (', against the rail web, 1), and its concave side, B,
against the chair jaw, E.
The key, A, may be parallel in form as shown, or it may be made with a slight
taper one end being slightly smaller than the other. The key is of a size to
fit the space between the chair jaw, E, and the web, D, of the rail so as to be
more or less straightened when driven into its place. Saw drafts may be formed
in its convex side, or in its concave side or in both, when the wood of which it
is made is not otherwise sufficiently pliable to admit of its being driven into its
place.
When in place the key is kept tight by its elastic tendency to return to its
curved form and that tendency keeps it tight even when shrunk to some extent
by drying.
The key, A, may be made with its four corners bevilled as shown in Figure 2:
or it may be made without bevillings as shown in Figure 4; or one or more of
its corners may be bevilled or rounded. Two half keys with their curvatures
reversed may be combined, being held together, for convenience in handling, in
any convenient way.
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: --
The making of a wooden key for a railway chair with concave and convex sides
substantially in the manner and for the purposes hereinbefore described.
Dated this Sixth day of September 1898.
EDMUND HUNT,
Applicant's Agent.