IMPROVED MEANS FOR SECURING METAL NUTS ON BOLTS."
Year: 1873

page_text: LETTERS PATENT to Charles Thackray, of Brigg, in the County of
Lincoln, Blacksmith, for the Invention of "IMPROVED MEANS FOR
SECURING METAL NUTS ON BOLTS."
PROVISIONAL SPECIFICATION left by the said Charles Thackray at
the Office of the Commissioners of Patents, with his Petition, on
the 27th March 1873.
I, CHARLES THACKRAY, of Brigg, in the County of Lincoln, Black-
smith, do hereby declare the nature of the said Invention for "IMPROVED
MEANS FOR SECURING METAL NUTS ON BOLTS," to be as follows:
This Invention relates to improved and simple means for securing or
fastening metal nuts on bolts, and it consists in employing a steel
spring washer or worm which can be placed on any screw or bolt
according to size. The spring washer can be used either with one or
moro nuts; if with one nut the steel spring washer is placed next to

page_text: the article to be secured, and the nut turned down on the spring, the
spring will then firmly keep the nut in its place, so that the nut turning
or shaking loose is rendered impossible, and cannot be effected either
by expansion or contraction. If used with two nuts the spring washer
is to be placed between the nuts and the top nut screwed down on the
steel spring washer.
SPECIFICATION filed in pursuance of the conditions of the Letters
Patent, and of an Order of the Lord Chancellor, by the said
Charles Thackray in the Great Seal Patent Office on the 11th
October 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
THACKRAY, of Brigg, in the County of Lincoln, Blacksmith, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-seventh day of March, in
the year of our Lord One thousand eight hundred and seventy-three,
in the thirty-sixth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Charles Thackray, Her
special licence that I, the said Charles Thackray, my executors, admi-
nistrators, and assigns, or such others as I, the said Charles Thackray,
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
"IMPROVED MEANS FOR SECURING METAL NUTS ON BOLTS," upon the condition
(amongst others) that I, the said Charles Thackray, 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 a
to be performed, and cause the same to be filed in the Great Seal
Patent Office on or before the Fourteenth day of October One thousand
eight hundred and seventy-three.
NOW KNOW YE, that I, the said Charles Thackray, do hereby

page_text: is to be performed, to be particularly described and ascertained in and
by the following statement in writing, and on reference being had to
the accompanying Sheet of Drawings, that is to say:-
This Invention, which is illustrated on the accompanying Sheet of
Drawings in Figures 1 to 4, relates to improved and simple means for
securing, fastening, or locking metal nuts on bolts, and consists in the
employment of a steel spring washer or worm 1 (having more than
one complete turn of any suitable cross section) which is placed round
the bolt and next the article, to be secured when only one nut is used,
which is then turned down upon it (sec Figure 3), but when two nuts
are used it is placed between them and the outer or "lock" nut screwed
down upon it (see Figure 4).
The application of the washer however entirely obviates the necessity
for the second or "lock" nut (which is a very ineffectual means of
retaining the fastening nut) as it effectually keeps the fastening nut
securely on its bolt, and prevents it turning loose or being affected either
by expansion or contraction.
Having thus described the nature of my said Invention for "Improved
Means for Securing Metal Nuts on Bolts," I would remark in conclusion
that I claim as my Invention, the application of a steel spring washer
or worm having more than one complete turn, substantially as and for
the purposes herein specified.
In witness whereof, I, the said Charles Thackray, have hereunto
set my hand and seal, this Seventeenth day of September, in
the year of our Lord One thousand eight hundred and seventy-
three.
CHARLES THACKRAY. (L.S.)