AN IMPROVED Lock NOT
Year: 1875

page_text: LETTERS PATENT to Arthur Herbert Grave Hobson, of Liverpool, in
the County of Lancaster, for the Invention of "AN IMPROVED Lock
NOT."
:
Sealed the 31st August 1875 and dated the 11th June 1875.
PROVISIONAL SPECIFICATION left by the said Arthur Herbert Grave
Hobson at the Office of the Commissioners of Patents, with his
Petition, on the 11th June 1875.
I, ARTHUR HERBERT GRAVE HOBSON, of Liverpool, in the County
of Lancaster, do hereby declare the nature of the said Invention for
"AN IMPROVED Lock NUT," to be as follows:-
This Invention consists in adding to an ordinary nut a tapered pro-
jection of length rather more than the thickness of the nut. This
tapered projection is tapped both inside and out, the inside being the
continuation of the tapped part of the nut. This tapered projection is
divided into two or more segments by a slot or slots which divide it. A

page_text: second nut having a tapered hole screwed to correspond with the
tapered projection on the first nut is screwed on the tapered projection,
so that it "springs in" the segments of the tapered projection and
tightly squeezes them against the bolt that it is required to secure, thus
preventing the possibility of either the nut or the bolt moving.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Arthur Herbert Grave Hobson in the Great Seal
Patent Office on the 8th December 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ARTHUR
HERBERT GRAVE HOBSON, of Liverpool, in the County of Lancaster,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of June, in the year of
our Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Arthur Herbert Grave Hobson, Her
special licence that I, the said Arthur Herbert Grave Hobson, my
executors, administrators, and assigns, or such others as I, the said
Arthur Herbert Grave Hobson, 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 LOCK NUT," upon the condition
(amongst others) that I, the said Arthur Herbert Grave Hobson, 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 Arthur Herbert Grave Hobson, do
hereby declare the nature of my said Invention, and in what manner

page_text: the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
My Invention consists in adding to an ordinary nut a tapered pro-
jection of length rather more than the thickness of the nut. This
tapered projection is tapped or screwed both inside and out, the inside
being the continuation of the tapped or screwed part of the nut. This
tapered projection is divided by a slot or slots. A second nut having a
tapered hole screwed to correspond with the tapered projection on the
first nut is screwed on the tapered projection, so that it springs in the
tapered projection and tightly squeezes or jams it against the bolt that
it is required to secure.
In order that my Invention may be more clearly understood I have
hereunto attached a Sheet of Drawings illustrating the same. The
Drawings are full size, and like letters and figures marked thereon
denote similar parts and correspond with those in the following
explanation.
Figure 1 illustrates an outside view of a lock nut constructed
according to my Invention; Figure 2 is a sectional view of Figure 1.
Figures 3, 4, 5, and 6 are plans illustrating my improved lock nut.
Upon reference to the Drawings it will be seen that my Invention
consists in adding to an ordinary nut a a tapered projection 6 of length
rather more than the thickness of the nut a. This tapered projection b
is tapped on the inside c and screwed on the outside d, the inside c being
a continuation of the tapped part of the nut a. The tapered projection 6
is divided by a slot e. A second nut having a tapered hole tapped to
correspond with the screw on the tapered projection 6 of the first nut a
is screwed on to the tapered projection 6, so that it springs in the tapered
projection and tightly squeezes or jams it against the bolt A that it is
required to secure. The tapered projection 6 may be provided with one
slot e, as shown at Figure 3, or it may be provided with two or more
slots, such as shown at Figures 4, 5, and 6.
Having now described and ascertained the nature of my said Inven-
tion, and shown how the same may be put into practice, I would have
it understood that I do not confine myself to any particular dimension
or size of a lock nut constructed according to my Invention, but what I

page_text: claim as my Invention and secured to me by Letters Patent as aforesaid
is, the nut a having a tapered screwed projection, such as 6, and a slot
or slots such as e, and provided with a second nut, such as h, the whole
forming an improved lock nut, substantially as shown and set forth.
In witness whereof, I, the said Arthur Herbert Grave Hobson,
have hereunto set my hand and seal, this Sixth day of December,
in the year of our Lord One thousand eight hundred and seventy-
five.
ARTHUR HERBERT GRAVE (L.s.) HOBSON.