An Improved Bolt and Nut Lock, principally adapted for Railway Purposes.
Year: 1899

page_text: Date of Application, 3rd Oct., 1899-Accepted, 23rd Dec., 1899
COMPLETE SPECIFICATION.
An Improved Bolt and Nut Lock, principally adapted for Railway
Purposes.
66
I, FREDERICK BAKER, of Maylands," Kambrook Road, Caulfield, near
Melbourne, in the Colony of Victoria, Builder, do hereby declare the nature of
this invention and in what manner the same is to be performed to be particu-
larly described and ascertained in and by the following statement:―
This improved bolt and nut lock has been devised mainly for use on railways
for securing the ends of the rails and the fish plates together although it is
equally applicable for many other purposes where nuts are required to be secured
on bolts in such a manner that they will not be liable to work loose.
A further object of this invention is to provide a nut which can be more
readily and quickly fitted and secured upon a bolt than is possible with screw-
threaded nuts and bolts and at the same time my invention enables a nut to
be removed and again replaced without damaging either the nut or the bolt.
In order that my invention may be clearly understood I will describe it by
reference to the acompanying drawings in which
Figure 1 is a sectional side elevation of a bolt adapted to be fitted with a nut
in accordance with this invention.
Figure 2 is a side elevation of said nut.
Figure 3 is a similar view of the locking piece or key used for expanding the
lower end of the bolt as hereinafter described.
Figure 4 is a vertical central section of the bolt and nut whilst,―
Figure 5 is a horizontal section on line 5-5 Figure 4, and,―
Figures 6 to 10 are views of various modifications.
Bolts A to be fitted with nuts in accordance with this invention are constructed
as illustrated in Figure 1 with a head B at one end in the ordinary manner but
the other end instead of being screw threaded is split longitudinally. A hole C
is formed from end to end of the bolt and the lower end of this hole is tapering.
It is adapted to receive a pin or key D whereby the lower end of the bolt can be
expanded.
The nut E is formed with a slightly tapering hole F the smallest diameter of
which is adapted to fit over the bolt. In practice this end of the nut is placed
against the fish plate or other article to be secured as illustrated in Figure 4
and the bolt A having been passed through, the pin or key D is inserted and is
driven into the bolt so as to expand its end into the tapering hole F in the
nut.
F
If preferred this hole might be constructed as illustrated in Figure 7 that is it
might be parallel for part of its length and tapering for the balance and instead
of the end of the bolt being split into four sections as in Figure 5 it might be
split as illustrated in Figure 6 in one direction only.
The upper end of the pin or key D is formed with a head or shoulder G to
facilitate its withdrawal from the bolt, whilst its lower end may be provided
with means for securing it in position within the bolt.

page_text: These means might consist of ratchet teeth H formed upon the pin or key as
illustrated in Figure 9 to engage with the edge of the bolt or a hole or holes
might be formed through the projecting end of said pin or key as illustrated
in Figure 4 for the reception of a split pin I. Another means for attaining the
same object consists in constructing the end of the key or pin in such a way
that it can be turned or bent over after it has been passed through the bolt as
illustrated in Figure 8.
This said bolt may be split either partially or from end to end and can be con-
structed so that it will expand all round or only on opposite sides. It can be
made round, oblong, square or any other preferred shape in cross section, and the
pin or key D used for expanding its lower end may be similarly shaped if
preferred.
The nut E can be of any preferred shape. For instance it might be the fish
plate itself as illustrated in Figure 10 in which case the plate forming the nut
would be formed with a number of tapering or partly tapering and partly
parallel holes according to the number of bolts required to be used.
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―
The herein described bolt and nut lock for railway and other purposes com-
prising a bolt having its lower end split longitudinally and having an axial hole
formed in it from end to end, with the lower end of said hole tapering to receive
a pin or key whereby the lower end of the bolt can be expanded in combination
with a nut having a tapering hole substantially as and for the purposes herein
described and explained and as illustrated in the accompanying drawings.
Dated this 3rd day of October One thousand eight hundred and ninety-nine