AN IMPROVED NUT LOCK FOR RAILWAY FISH BOLTS AND FOR OTHER LIKE. PURPOSES." AND FOR OTHER LIKE PURPOSES.
Year: 1875

page_text: LETTERS PATENT to John Frost, of the Town and County of Derby,
for the Invention of " AN IMPROVED NUT LOCK FOR RAILWAY FISH BOLTS
AND FOR OTHER LIKE. PURPOSES."
AND FOR OTHER LIKE PURPOSES.'
Sealed the 28th January 1876, and dated the 15th November 1875.
PROVISIONAL SPECIFICATION left by the said John Frost at the
Office of the Commissioners of Patents, with his Petition, on the
15th November 1875.
I, JOHN FROST, of the Town and County of Derby, do hereby declare
the nature of the said Invention for "AN IMPROVED NUT LOCK FOR RAILWAY
FISH BOLTS AND FOR OTHER LIKE Purposes,” to be as follows:-
My Invention relates to an improved device for locking the nuts of
railway fish bolts and other nuts to prevent their becoming loosened by
jars or vibration. The nut lock consists of a stop hinged to a plate
which is secured by the fish plate, the said stop being introduced
between a pair of nuts of the fish plate. The locking is effected by the
flat ends of the stop abutting against the flat sides of the nuts after the
same have been screwed up.

page_text: The plate to which the stop is hinged has holes for the fish bolts to
pass through, so that it may be clamped against the fish plate by
tightening the nuts, and the stop is hinged by its upper edge or other-
wise mounted on this plate, so that it may be turned up out of the way
in screwing up the nuts, and turned down between them when they are
tightened. There would be a similar nut lock for each pair of fish
nuts.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Frost in the Great Seal Patent Office on
the 17th March 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, John
FROST, of the Town and County of Derby, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fifteenth day of November, in the
year of our Lord One thousand eight hundred and seventy-five, in the
thirty-ninth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said John Frost, Her special
licence that I, the said John Frost, my executors, administrators,
and assigns, or such others as I, the said John Frost, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise,
and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "AN IMPROVED
NUT LOCK FOR RAILWAY FISH BOLTS AND FOR OTHER LIKE PURPOSES," upon the
condition (amongst others) that I, the said John Frost, my executors or
administrators, by an instrument in writing under my, or their, or one
of their hands and seals, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was
to be performed, and cause the same to be filed in the Great Seal
Patent Office within six calendar months next and immediately after
the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Frost, do hereby declare
the nature of my said Invention, and in what manner the same is to

page_text: be performed, to be particularly described and ascertained in and by
the following statement, reference being had to the accompanying
Sheet of Drawings, and to the letters and figures marked thereon,
that is to say :-
My Invention relates to an improved device for locking the nuts of
railway fish bolts to prevent them becoming loosened by the vibration
caused by passing trains. The nut lock consists of a flap hinged to a
plate which is secured against the fish plate by the fish bolts, the said
flap being introduced between a pair of nuts of the fish plate, and
forming a stop to prevent their turning by the flat ends of the flap
abutting against the flat sides of the nuts after the same have been
screwed up.
The plate to which the flap is hinged has holes for the fish bolts to
pass through, so that it may be clamped against the fish plate by
tightening the nuts, and the flap is hinged by its upper edge or other-
wise mounted on this plate, so that it may be turned up out of the way
in screwing up the nuts, and turned down between them when they
are tightened. There would be a similar nut lock for each pair of fish
Figure 1 shows a front view of two nut locks in position between the
four nuts of a fish plate, the latter, together with a portion of the rail,
nuts, and bolts, being drawn in blue color, and forming no part of this
Invention; Figure 2 shows an end view of the nut lock detached.
a, a, are the locking devices, each consisting of a metal flap hinged at
the upper edge to a metal plate b, having holes through which the fish
bolts c, c, are passed, and by. which plate b is clamped on the outside of
the fish plate & by the nuts e, e. The flap a is turned up out of the
way, as seen in dotted lines, while screwing up the nuts, after which it
is reversed, so as to be interposed between the two nuts (of square or
polygonal form), as shown, and thereby prevent the nuts becoming
unscrewed, the flap being of such length that its ends, which are square
and flat, abut against the flat sides of the nuts.
Having described the nature of my Invention, and the manner of
performing the same, I declare that what I claim as the Invention to be
protected by the herein-before in part Letters Patent is, the use in

page_text: combination with a railway fish plate of a flap or stop applied between
the nuts of the fish bolts, and hinged to a plate secured to the fish plate,
substantially as and for the purpose specified.
In witness whereof, I, the said John Frost, have hereunto set my
hand and seal, this Seventeenth day of March, in the year of 5
our Lord One thousand eight hundred and seventy-six.