IMPROVEMENTS IN SCREW TAPS. AND IN THE MODE OF FIXING THE SAME
Year: 1868

page_text: LETTERS PATENT to Emile Watteeu, of Vulcan Works, Middlesborough.
on-Tees, in the County of York, for the Invention of "IMPROVEMENTS
IN SCREW TAPS. AND IN THE MODE OF FIXING THE SAME."
Sealed the 5th. September 1868, and dated the 7th April 1868.
PROVISIONAL SPECIFICATION left by the said Emile Watteeu at
the Office of the Commissioners of Patents, with his Petition, on
the 7th April 1868.
I, EMILE WATTEEU, of Vulcan Works,. Middlesborough-on-Tees, in
the County of York, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN SCREW TAPS, AND IN THE MODE OF FIXING THE SAME,"
to be as follows:-
My Invention consists in forming flutes or flat sides along the entire
length of screw taps, and in driving the taps through the said flat sides
or flutes whereby the driving portion is always in immediate relation to
the cutting part, the torsion being thus distributed equally over the tap;
also, by making the sectional area of the taps equal, or nearly so,

page_text: throughout their length they are less liable to become distorted in
hardening, and in being of uniform strength they are more durable.
My improved taps may be made with flat sides or polygonal and with
flutes combined. I arrange such screw taps to be placed in position in
the driver from the top of the machine, so that the space between the
driver and the work under operation is reduced to the minimum extent,
the tap being made to travel through the driver as the cutting proceeds,
instead of the driver being always made to act on the upper end of the
tap as heretofore.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Emile Watteeu in the Great Seal Patent Office on
the 9th September 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EMILE
WATTEEU, of Vulcan Works, Middlesborough-on-Tees, in the County
of York, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Seventh day of April, in the year
of our Lord One thousand eight hundred and sixty-eight, in the
thirty-first year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Emile Watteeu, Her
special licence that I, the said Emile Watteeu, my executors,
administrators, and assigns, or such others as I, the said Emile
Watteeu, 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 "IMPROVEMENTS IN SCREW TAPS, AND IN THE MODE OF FIXING
upon the condition (amongst others) that I, the said Emile
Watteeu, 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.

page_text: NOW KNOW YE, that I, the said Emile Watteeu, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement thereof, reference being had to the accompanying
Sheet of Drawings, and to the figures and letters marked thereon, that
is to say:
My Invention consists in forming flutes or flat sides along the entire
length of screw taps, and in driving the taps through the said flat sides
or flutes whereby the driving portion is always in immediate relation to
the cutting part, the torsion being thus distributed equally over the tap;.
also, by making the sectional area of the taps equal, or nearly so,
throughout their length they are less liable to become distorted in
hardening, and in being of uniform strength they are more durable.
My improved taps may be made with flat sides or polygonal and with
flutes combined. I arrange such screw taps to be placed in position in
the driver from the top of the machine, so that the space between the
driver and the work under operation is reduced to the minimum extent,
the tap being made to travel through the driver as the cutting proceeds,
instead of the driver being made always to act on the upper end of the
tap as heretofore.
But in order that my Invention may be readily understood I will now
proceed more particularly to describe the manner of performing the
same.
Figure 1 on the accompanying Drawings shows an elevation, and
Figure 2 shows a plan of my improved screw tap A, and Figures 3 and 4
show respectively a part section and part plan of the nut tapping machine
with the screw tap in position.
a, a, a, are the longitudinal flutes extending from end to end of the
tap, so that when the tap is placed inside the driver B from the top of
the machine C, as shown in Figures 3 and 4, the projections b, b; on
the driver enter the grooves a, and thus cause the screw tap to rotate
with it, the tap A passing down through the driver B as the cutting of
the thread in the nut, D under operation proceeds. By this arrange-
ment it will be seen that the driver B can be situated close to the nut D
under operation, and the machine thereby rendered more compact than
heretofore. The driver B is also introduced from the top into the
hollow spindle E' of the spur wheel E, and rests with a shoulder on a

page_text: projecting rim thereon as shown. It is carried round by means of the
feathers 6 thereon passing into grooves formed in E¹. The other parts
of the machine are of known construction, and need therefore not. be
further described.
Having, thus described the nature of my Invention, and in what manner
the same is to be performed, what I claim is,―
First. Constructing screw taps with grooves, flutes, or flat surfaces, or
a combination thereof extending along the entire length of both the
cutting part and the shank of the tap, substantially as and for the pur-
poses herein-before set forth.
Second: Driving the said screw taps by means of drivers having
projections made to press against the grooves, flutes, or flat sides,
substantially as herein-before described with reference to the accom-
panying Drawing;
In witness whereof, I, the said Emile Watteeu, have hereunto set.
my hand and seal,, this Twenty-fifth day of August, in the year
of our Lord One. thousand. eight. hundred and sixty-eight.
EMILE WATTEEU. (L.S.)