NEW OR IMPROVED MACHINERY FOR THE MANUFACTURE OF SCREWS."
Year: 1856

page_text: LETTERS PATENT to Leonard Bower, of Birmingham, in the County of
Warwick, Manufacturer, for the Invention of "NEW OR IMPROVED
MACHINERY FOR THE MANUFACTURE OF SCREWS."
PROVISIONAL SPECIFICATION left by the said Leonard Bower at the
Office of the Commissioners of Patents, with his Petition, on the
22nd February 1856.
I, LEONARD BOWER, of Birmingham, in the County of Warwick, Manu-
facturer, do hereby declare the nature of the said Invention for NEW OR
IMPROVED MACHINERY FOR THE MANUFACTURE OF SCREWS," to be as follows
My said Invention consists of new or improved machinery having for its
object the production of a gimlet point in screws, that is to say, a taper-
wormed point.
My Invention consists of the addition of turning tools or cutters and a
gauge or stop to the ordinary worming dies used in the manufacture of screws:
I place on the side of one of the worming dies two or other suitable number
of cutters of a shape proper to produce a taper and screwed point to the blank,
the said cutters being placed in the same holder as the worming die, and fixed
and adjusted by the same screw. To the other worming die I attach a guide
or bearing, which supports the end of the blank while the opposite cutters form
the point. The blank advances in and retires from the worming dies in the
usual manner, and during the closing of the dies the before-mentioned cutters
cut. the end of the blank into a conical shape, and worm the same, so as to
form it into a gimlet point.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Leonard Bower in the Great Seal Patent Office on the
21st August 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, LEONARD
BOWER, of Birmingham, in the County of Warwick, Manufacturer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-second day of February, 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 Leonard Bower, Her special licence that I, the said Leonard
Bower, my executors, administrators, and assigns, or such others as I, the
said Leonard Bower, 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
"NEW OR IMPROVED MACHINERY FOR THE MANUFACTURE OF SCREWS," upon the
condition (amongst others) that I, the said Leonard Bower, 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 Leonard Bower, do hereby declare
the nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, that is to say:-
My Invention consists of the new or improved machinery for the manu-
facture of screws constructed in the manner herein-after described, and
illustrated in the accompanying Drawing; the said machinery having for
its object the production of a gimlet point in screws, that is to say, a
taper-wormed point.
My said Invention consists of the addition of turning tools or cutters, and
aguage or stop to the ordinary worming dies used in the manufacture of
screws.
Figure represents my Invention in plan; and Figure 2 represents a front
elevation of the same. a, b, are the ordinary worming dies fixed in the holders

page_text: c, d, by the screws e,f. I place on the side of one of the worming dies two
or other suitable number of cutters; these cutters are represented at g, h, in
Figure 1. The said cutters g, h, are placed in the same holders as the
worming die 6, and are fixed in their place by the screw i. The form of the
cutters g, h, and their position is such that they produce a taper and screwed
point to the blank. To the worming die opposite to that carrying the cutters
g, h, I fix a guide or stop k; the said guide or stop k is fixed in the same
holder as the worming die a, and is fixed by the screw l. The stop or guide k
may be formed into a cutting tool, so as to assist in the formation of the worm.
The screw blank upon which a worm is to be cut advances between and retires
from the worming dies a, b, in the usual manner, and during the closing of the
dies the cutters g, h, and stop or guide k, cut the end of the blank into a
conical shape, and worm the same, so as to form a gimlet point.
Although I prefer to use two cutters on one side, and one stop or cutter
on the other side, in addition to the ordinary worming dies, as represented
in Figure 1, yet I do not limit myself to any precise number of the said
cutters.
Having now described the nature of my said Invention, and the manner of
carrying the same into effect, I wish it to be understood that I do not limit
myself to the precise details herein described and represented, as the same may
be varied without departing from the nature of my said Invention; but I claim
as my Invention the use of moveable cutters in conjunction with the ordinary
worming tools of screw-making machinery for the purpose of forming a taper
wormed point or gimlet point, as herein-before described and illustrated in the
accompanying Drawing.
In witness whereof, I, the said Leonard Bower, have hereunto set my
hand and seal, this Twentieth day of August, in the year of our Lord.
One thousand eight hundred and fifty-six.
0 Witness,
RICHARD SKERRETT,
Clerk to George Shaw.
LEONARD BOWER. (L.S.)