IMPROVEMENTS IN APPARATUS FOR CUTTING SCREW THREADS ON TUBES, RODS, OR OTHER ARTICLES.
Year: 1874

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane,
in the County of Middlesex, Patent Agent, for the Invention of
"IMPROVEMENTS IN APPARATUS FOR CUTTING SCREW THREADS ON TUBES,
RODS, OR OTHER ARTICLES.”. A communication from abroad by
Norman Whipple Frost, of Cohoes, in the County of Albany, 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 his Petition
and Declaration, on the 21st October 1874, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.

page_text: administrators, and assigns, Her Royal Letters Patent for the same, and
have mado solemn Declaration that it has been communicated to me
from abroad by Norman Whipple Frost, of Cohoes, in the County of
Albany, 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 Invention,
and in what manner the same is to be performed in and by the
following statement, reference being had to the accompanying Sheet
of Drawings, and to the letters and figures marked thereon (that is to
say) :-
The object of this Invention is to fürnish ready and convenient means
for cutting screw threads on gas pipes and tubing of all kinds, as well as
on rods, bolts, and similar articles, and it consists in the construction
and arrangement of parts herein-after described.
In the Drawing Figure 1 is a vertical section of Figure 2 taken on
the line x, x Figure-2 is a section of Figure 1 taken on line y, y.
Similar letters of reference indicate corresponding parts in the two
Figures.
A is the bed plate by which the machine is fastened to a bench or
other fixture; B is the vice plate which is made adjustable on the
bed A; C and D are jaws of the vice. The lower jaw is stationary and
is made in two parts connected together by the bolt E (see Figure 1).
The upper jaw D is fastend to the sliding block F which is attached to
the vice screw G; this jaw D works down between the two parts of
the jaw C. Each of the jaws has a V shaped opening, the sides of
the V being serrated, so as to effectually hold the tube within the
angular opening and keep it from turning. The vice screw G works
through the crop bar H of the vicc plate. On each side of the vice
plate is a socket I; J is an arm or brace which is provided with two
pins or bars K. These bars enter the sockets I and support the arm in
a horizontal position, as seen in Figure 1; L is a pinion; M is the die
wheel; N is the feed screw; O are the dies which are made fast in the
face of the wheel M. The hub P of the dic wheel works on the
stationary feed screw N as the dic wheel is turned, and draws the die O
on to the tube and cuts the thread; R is the tube. The die wheel is a

page_text: 5thly. The stationary feed screw N and hub P in combination with the
ic wheel M, as and for the purposes described.
In witness whereof, I, the said Alexander Melville Clark, have here-
unto set my hand and seal, this Twenty-first day of October in
the year of our Lord One thousand eight hundred and seventy-
four
Witness,
H*. SWALES,
53, Chancery Lanc,
London.
A. M. CLARK. (L.S.)