CERTAIN IMPROVEMENTS IN MACHINERY FOR CUTTING SCREWS
Year: 1856

page_text: LETTERS PATENT to Andrew Shanks, Engineer, 6, Robert Street, Adelphi,
Wostminster, for the Invention of "CERTAIN IMPROVEMENTS IN MACHINERY
FOR CUTTING SCREWS."
Sealed the 1st July 1856, and dated the 2nd January 1856.
PROVISIONAL SPECIFICATION left by the said Andrew Shanks at the
Office of the Commissioners of Patents, with his Petition, on the 2nd
. January 1856.
I, ANDREW SHANKS, Engineer, 6, Robert Street, Adelphi, Westminster, do
hereby declare the nature of the said Invention for CERTAIN IMPROVEMENTS IN
MACHINERY FOR CUTTING SCREWS, to be as follows; and consist in combining a
rotary and a reciprocating movement to the dies and bolt respectively, so that
a better thread may be cut and at a quicker rato. I also employ dies of a
polygonal form, so that a variety of threads may be cut on the outer edges of
the steel disc, the whole revolving on a common centre.
Figs. 1, 2, 3, 4, 5, & 6 explain some of the applications proposed. Figs. 1,
2, & 3 represent the application of the revolving dies to hand die stocks. Fig.
4 is a side elevation of a bolt screwing machine; Fig. 5 is an end view of the
same. Fig. 6 shews the dies.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Andrew Shanks in the Great Seal Patent Office on the
1st July 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ANDREW
SHANKS, Engineer, 6, Robert Street, Adelphi, Westminster, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Second day of January, in the year of our Lord
One thousand eight hundred and fifty-six, in the nineteenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Andrew Shanks, Her special licence that I, the said Andrew Shanks, my
executors, administrators, and assigns, or such others as I, the said Andrew
Shanks, 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 " CERTAIN IMPROVEMENTS IN
MACHINERY FOR CUTTING SCREWS," upon the condition (amongst others) that I,
the said Andrew Shanks, 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.
per-
NOW KNOW YE, that I, the said Andrew Shanks, do hereby declare
the nature of my said Invention, and in what manner the same is to be
formed, to be particularly described and ascertained in and by the following
statement and accompanying Drawings (that is to say):-
Figs. 1,-2, 8; and 4 represent the screwing machine. The same letters refer
to the same parts in all the views.
(a, a,) are the dies, being hexagonal plates of steel, on each of the six sides
of which a screw is cut, the two forming a pair for cutting screws, in the usual
way; (f) are the axes on which the two dies revolve when it is desirable
to change them; (b) is the bolt being screwed; (c) is the head of mandrill,
liaving the usual apparatus to lay hold of the bolt béing screwed; (k) is tho
mandrill, through which the mandrill (e) passes, and on which the internal.
toothed wheel (d) is carried; (e) is the driving pulley, giving motion to the
wheel (d), which carries the arm (m) to which the dies are affixed; (f), the
headstock. The plate (9) carries a crank pin, operating on the connecting

page_text: rod (h), giving reciprocating motion to the lever (i); the pillar (5) supports
(n, Figs. 1 and 3,) are right and left
the whole at a convenient height.
screws, for opening and closing the dies.
Figs. 5 and 6 represent the dies stocks, with their rotative dies (a, a,) in
their places; (f,f) are the axes of the rotary dies; (e) is a shackle for the
point of the screw (d, d,) to press against, and which carries the gudgeon of
one of the dies; (b) is the body of one of the dies stocks; (c, c, c, c,) the
handles, one of which has a screw (d) to force the dies together.
CLAIMS.
1st, the use and application of dies, having six or any convenient number
of sides, so that they may be changed by being rotated on their axes, as
shewn.
2nd, the mode of passing one mandrill through the other, as shewn, one
carrying the dies and the other the bolt.
3rd, the application of the apparatus, so as to give a reciprocating and
backing movement to the bolt while being cut.
In witness whereof, I, the said Androw Shanks, have hereunto set my
band and seal, this First day of July, in the year of our Lord One
thousand eight hundred and fifty-six.
ANDREW SHANKS. (L.S.)