IMPROVED MACHINERY FOR CUTTING AND SCREW THREADING PIPES
Year: 1874

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery
Lane, in the County of Middlesex, Patent Agent, for the In-
vention of "IMPROVED MACHINERY FOR CUTTING AND SCREW THREADING
PIPES." A communication from abroad by Francis Wayland Allin,
of the City, County, and State of New York, United States of
America.
COMPLETE SPECIFICATION filed by the said Alexander Melville Clark
at the Office of the Commissioners of Patents, with Is Petition
and Declaration, on the 27th January 1874, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
at the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 27th January 1874, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
5 TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent, sond greeting.
5 TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Det A cont
and ananting

page_text: Her Majesty to grant unto me, my executors, administrators, and
assigns, Her Royal Letters Patent for the same, and have made
solemn Declaration that it has been communicated to me from abroad
by Francis Wayland Allin, of the Oity, County, and State of New York,
United States of America.
NOW KNOW YE, that I, the said Alexander Melville Clark, do
hereby declare that the following Complete Specification, under my
hand and seal, fully describes and ascertains the nature of the said In-
vention, and in what manner the same is to be performed, in and by
the following statement, reference being had to the Sheet of Drawings
hereunto annexed, and to the letters and figures marked thereon (that
is to say):-
:-
First. In a means for moving the cutting tool gradually up to its
work as the tool is revolved around the pipe or bar to be cut off.
Second. In mechanism for holding the screw die and revolving the
same around the pipe to cut the screw thereon.
In the Drawing Figure 1 is a vertical section of the machine
complete; Figure 2 is a plan of the same, with part of the die carrier
in section; Figure 3 is an elevation of the face plate and cutter; and 2
Figure 4 is a longitudinal section, showing some of the parts transposed
in position for cutting short pieces of pipe.
b
The frame or standard a supports the shaft and pinion 6 that is
revolved by a crank applied to the squared end of the shaft, or other-
wise. This pinion 6 gears into the wheel c, the shaft of which has a 2
bevel pinion d that communicates a revolving motion to the face
plate e carrying the cutting mechanism and the dic. This face plate
is upon a sleeve that surrounds a hollow gudgeon ƒ projecting from
the frame a, and through which gudgeon the pipe or rod to be cut or
threaded passes, and the ring i is attached upon the end of this hollow 3
gudgeon fand retains the face plate e, but allows it to revolve. Upon
the frame a, at the end of the opening through the gudgeon f, there

page_text: two teeth more or less than the number of teeth in the wheel c, hence
the position of the wheel and the cam flange changes in the revolution
of the parts relatively to the face plate and slide r, and the cam flange v
is made to act upon the stud or roller ³ that projects from the back of
the slider, and thereby the cutting tool is pressed toward the pipe by
the motion of the slide, and when the pipe has been cut off the parts
can either be turned backward to bring the cutter & clear of the pipe p¹
and ready for a second operation, or else the revolution can be con-
tinued, allowing the cam flange to complete a revolution to bring the
cutter to place again. If the stud u³ is made with an enlarged screw
next to the head it may be passed through the slider from the outside,
and can be easily removed or screwed firmly to place.
8
In order to cut a thread upon a short piece of pipe the parts are
transposed, as shown in the section, Figure 4. The slide 9 and gripping
jaws h, h', are placed in the die box m¹ of the cross head m, so as to
seize and revolve the short piece of pipe; and the die n is held
stationary within a die box m² that has a tubular projection m³ that
enters within the hollow gudgeon f, and is prevented from turning by
interlocking projections corresponding with those shown at 6, Figure 3.
In this manner the shortest lengths of pipe can be threaded, but the
first described arrangement of the parts is preferable with long pieces.
of nine

page_text: head m, columns 1, and revolving face plate e, substantially as set
forth.
In witness whereof, I, the said Alexander Melville Clark, have
hereunto set my hand and seal, this Twenty-seventh day of
January, in the year of our Lord One thousand eight hundred
and seventy-four.
Witness,
HENRY W. DEWEY,
53, Chancery Lane,
London.
A. M. CLARK. (L.S.)