IMPROVEMENTS IN STOCKS AND DIES FOR BOLT AND PIPE CUTTING ALSO " DADTI V ADD CAPITO SAD BY ALLTAG SELATIVES
Year: 1882

page_text: LETTERS PATENT to Charles Neil of Sheffield in the County of York for an
Invention of IMPROVEMENTS IN STOCKS AND DIES FOR BOLT AND PIPE
CUTTING ALSO
"
DADTI V ADD CAPITO SAD BY ALLTAG SELATIVES HAD
יוזז
PROVISIONAL SPECIFICATION left by the said Charles Neil at the Office
of the Commissioners of Patents on the 15th September 1882.
CHARLES NEIL of Sheffield in the County of York
"IMPROVEMENTS IN STOCKS
AND DIES FOR BOLT AND PIPE CUTTING, ALSO PARTLY APPLICABLE TO SCREW
CUTTING MACHINES FOR HAND AND POWER
"
The dies are made with three or more flat or nearly flat sides but by preference
with four sides and at each corner a cutting thread is provided (instead of at the
sides) thus bringing the acting or cutting edges at the best angle for their work
and enabling them to clear themselves without being "freed" in the ordinary way
and also allowing for readily sharpening them by grinding the flat sides. Each die
has a hole through for a bolt the head of which works in a slot in the frame so as
to allow the dies to slide in the slots for enabling the cutting edges to be changed
by turning the die around its bolt, a nut on the latter serving to fix the die in
position for work.
There is also a set screw acting against one side of each die for
further securing it in place and counteracting the strain against the front cutting
edge of die. The bush is made taper and fits in a corresponding taper guide or
socket on the frame of those stocks that are specially applicable for screwing pipes
and I am thus enabled always to bring the hole true with the die.
The construction and arrangement of the dies can also be adapted to screw
cutting machines driven by hand or power.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles Neil in the Great Seal Patent Office on the 15th March
1883.
CHARLES NEIL of Sheffield in the County of York "IMPROVEMENTS IN STOCKS
AND DIES FOR BOLT AND PIPE CUTTING, ALSO PARTLY APPLICABLE TO SCREW
CUTTING MACHINES FOR HAND AND POWER."
The dies are made with three or more flat or nearly flat sides but by preference
with four sides and at each corner a cutting thread is provided (instead of at the
sides) thus bringing the acting or cutting edges at the best angle for their work
and enabling them to clear themselves without being "freed" in the ordinary way
and also allowing for readily sharpening them by grinding the flat sides. Each
die has a hole through for a bolt the head of which works in a slot in the frame so
as to allow the dies to slide in the slots for enabling the cutting edges to be
changed by turning the die around its bolt, a nut on the latter serving to fix the
die in position for work. There is also a set screw acting against one side of each
die for further securing it in place and counteracting the strain against the front
cutting edge of die. The bush is made taper and fits in a corresponding taper
guide or socket on the frame of those stocks that are specially applicable for
screwing pipes, and I am thus enabled always to bring the hole true with the dies.
The construction and arrangement of the dies can also be adapted to screw
cutting machines driven by hand or power.
In order that my Invention may be more fully understood I will now proceed
to describe the same with the aid of the accompanying drawings. Figure 1 is a
side elevation of a stock with dies fitted therein and constructed according to my
Invention especially applicable for screwing pipes Figure 2 is a vertical
longitudinal section and Figure 3 is a plan of same a a are the dies; b b are the
bolts for securing same; c, c show the slots in the casting or frame forming a
holder for the dies a in which the cylindrical heads b' of the bolts b b are free to
slide so as to adjust the position of the dies which would be adjustable in accordance
with the length of the slots; f is this casting forming the stock or frame so that
the dies may be turned round by loosening the bolts in the slots thus changing the
cutting edges as required without altogether removing same; d, d, d, d are the
four cutting edges of the dies, a, a, best seen at Figure 3. Each different cutting
edge is as will be observed of different diameter to the other so as to enable the
same dies to be adapted to tubes of various sizes and the threads being cut at the
corners of the dies they are easily ground on a stone to resharpen them; e, e, are
the nuts on the bolts b, b, for securing the dies when adjusted in the required
position in the slots c c, g g are the set screws which act on one side of each of
the dies a, a, for additional security to the said dies for their better adjustment and
for setting the dies to standard or not as may be required. h, shows the form of
bush I prefer to use for screwing pipes, this bush is fitted and secured by a set
screw h¹ in the taper guide formed in the frame f thus always bringing the hole in
the bush (through which the pipes to be cut are passed) true with the dies;
ii are the handles shown broken off to economize space and which are shown
screwing into the tool frame f. By screwing the handles into the stock or frame,
I am able to detach them with facility from the same and consequently the stock
will go into much less compass than heretofore if necessary. As before stated these
stocks and dies may be adapted to screw cutting machines driven by hand or
power for example by taking out these handles i and screwing the frame or stock

page_text: carrying the dies into the face plate of lathe it thus at once becomes a screw
cutting machine.
Figure 4 shows in side elevation Figure 5 in vertical longitudinal section and
Figure 6 in plan my Invention as applied to the so called "Whitworth thread"
Engineers Stock." The dies a a for this frame are fitted inside the box as in the
arrangement of tool previously described so that they (the dies) have room to turn
round in the box but the aperture k through the centre of the die is preferably as
shown counterrank so that the head of the bolt will fit in the die and be flush with
its face and the nuts for tightening the dies will be on the top of frame and by this
means the dies being level with the edges of the bottom will screw up to a
shoulder.
There are four holes in the sides of the frame fin this arrangement of stock but
two set screws g g only are shown the two additional holes are only made so that
the dies may if required be set to make left handed screw threads. Similar letters
refer in these three last figures to the corresponding parts in those last described.
Having now described the nature of my said Invention and in what manner the
same is to be performed I declare that I claim.
First In the dies of stocks for bolt and pipe cutting the formation of same with
cutting edges at the corners instead of the sides as heretofore whereby one pair of
dies will screw four sizes with the cutting edges at best angle for work and for
sharpening and clearing all substantially as set forth.
Second-The construction and arrangement of frame or stock whereby the
position of the dies can be adjusted and secured therein with facility through being
able to slide and turn when required in the slot of the frame or stock and secured
therein all substantially as set forth.
Third-The general arrangement and construction of stocks and dies for bolt and
pipe cutting including the taper bushes to fit in the taper guide in frame all
substantially as and for the purposes set forth.
Fourth-The application of the arrangement of bolts and dies as described when
applied to screwing machines driven by gear wheels for hand and power.
.
In witness whereof I the said Charles Neil have hereunto set my hand and
seal this Twelfth day of March in the year of our Lord One thousand
eight hundred and eighty-three.
CHARLES NEIL (LS.)