Forming Screw Threads in Nuts and Hollow Articles
Year: 1885

page_text: Forming Screw Threads in Nuts and Hollow Articles
We EDWARD COPE of Phoenix Works, Openshaw Manchester, in the County
of Lancaster Nut and Tube Manufacturer, and ALFRED HOLLINGS of the same
place, Manager of Works do hereby declare the nature of the said invention for
IMPROVEMENTS IN THE MANUFACTURE OF TAPS AND LIKE TOOLS FOR FORMING
SCREW THREADS IN NUTS AND HOLLOW ARTICLES to be as follows
The object of our present invention is to provide for use in screwing nuts and
other articles, more particularly when of large size, taps possessing greater strength
than those heretofore used, more durable in ordinary work, lighter to handle and
greatly reduced in first cost
We first cast a hollow blank in steel and subsequently after reheating draw this
down by rolls over a mandrell to the required size The exterior and interior may
as near as possible follow the outline which the tap is required to take or it may
be a plain cylinder or of other section, the main point being to secure when a tap
18 finished as much unbroken rolled skin and consequent strength as is possible
After drawing the blank down by rolls and mandrell the shank is formed by
forging or otherwise and the taps fashioned hardened and finished in any desired
or usual way

page_text: Forming Screw Threads in Nuts and Hollow Articles.
We EDWARD COPE of Phoenix Works, Openshaw, Manchester, in the County
of Lancaster, Nut and Tube Manufacturer, and ALFRED HOLLINGS of the same
place, Manager of Works, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement
The object of our present invention is to provide for use in screwing nuts and
other hollow articles, more particularly when of large size, taps and like tools
possessing greater strength than those heretofore used, more durable in ordinary
work, lighter to handle and greatly reduced in first cost together with greater
certainty of producing a more even temper, and consequently straighter article.
We brst cast a hollow blank in steel and subsequently after reheating draw this
down by rolls over a mandrell to the required size The exterior and interior may
as near as possible follow the outline which the tap is required to take, or it may
be a plain cylinder or of other section, the main point being to secure when a tap
is finished as much unbroken rolled skin and consequent strength as is possible
The blank 18 drawn down as above set forth by rolls and mandrells until it 18 of
the required diameter for body of the tap or for the shank When the blank is
drawn down to the required diameter for the body the shank is formed by forging
or otherwise When the blank is drawn down to the diameter required for the
shank the body is formed by compressing the metal whilst heated by hydraulic or
other end pressure The taps are then fashioned hardened and finished in any
usual way
On the accompanying sheet of drawings. Fig 1 is a plan, and fig 2 a section of
a tap with a cylindrical hole having the shank drawn down Fig 3 is a plan of a
tap having a hole corresponding in cross section to the cross section of the tap, the
shank part being reduced as in fig 1 Fig 4 18 a longitudinal section of a tap in
which the body has been enlarged by bydraulic or other end pressure after the
blank has been reduced to the size requisite for the shank If desired whilst
compressing the metal of the body in fig 4 the hole might be enlarged so as to
resemble fig 1
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed I declare that what
I claim is
First. The improvements in the manufacture of taps and like tools herein set
farth

page_text: Second The manufacture of taps and like tools by casting a hollow blank,
drawing the said blank down to the required size, and finishing substantially as
set forth
Third Taps and like tools manufactured by casting rolling and finishing a
hollow blank substantially as herein set forth