IMPROVEMENTS IN APPARATUS for CUTTING AND SCREWING TUBES AND RODS, AND FOR SCREWING UP TUBES
Year: 1878

page_text: LETTERS PATENT to William Crow, of Birmingham, in the County of War-
wick, Machinist, for the Invention of "IMPROVEMENTS IN APPARATUS for
CUTTING AND SCREWING TUBES AND RODS, AND FOR SCREWING UP TUBES."
Sealed the 15th April 1879, and dated the 24th December 1878.
PROVISIONAL SPECIFICATION left by the said William Crow at the Office
of the Commissioners of Patents on the 24th December 1878.
WILLIAM CROW, of Birmingham, in the County of Warwick, Machinist.
PROVEMENTS IN APPARATUS FOR CUTTING AND SCREWING TUBES AND RODS, AND
FOR SCREWING UP TUBES."
"IM-
The apparatus in one of its forms as a cutting tool consists of a headstock to
receive the rod or tube provided with a lever handle. At the top of the headstock
is a boss tapped with a female screw and grooved on one side to receive a flat
sliding cutter, which is kept in position by a metal plate screwed to the boss; the
upper end of the cutter is bent over at right angles, and is received by a collar
formed on a male screw which passes through the head of the cutter and through
the female screw on the boss on the headstock, so that by turning this screw the
pressure of the sliding cutter is brought upon the rod or tube which is in the grip
of the headstock, and turning the tool round effects the cut as in the usual tool
with rotary cutters, the sliding cutter being advanced upon the rod or tube as
greater depth is required by the action of the screw through the boss carrying the
cutter lower down and thus deepening the cut on the tube or rod.
Another form of the apparatus adapted for cutting and screwing rods or tubes
consists of a double jawed head similar to that of a pair of gas tongs, and capable
of opening and closing upon a pin joint; one jaw is lengthened to form a strong
lever handle, and the other is extended to a short distance below the pin joint and
CD...

page_text: formed into a boss to receive an adjusting set screw by which the jaws may be
opened and closed; or this set screw may be made to work through the head of the
jaws instead of the foot; or the jaws may be pinned at the head and have the
adjusting screw at the foot. Inside the jaws cutters are fixed, and I prefer three
cutters set as nearly as may be equidistant, and following each other. When the
apparatus is used for screwing a thread on a tube or rod, either two dies or one die
and a cutter are to be used in place of the three cutters. The grip is increased as
required by the adjusting set screws before named. In applying my Invention to
gas tongs for screwing up tubes I use this form of apparatus without dies or cutters,
and the jaws toothed or roughed as may be required.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Crow in the Great Seal Patent Office on the 20th June
1879.
WILLIAM CROW, of Birmingham, in the County of Warwick, Machinist. “IM-
PROVEMENTS IN APPARATUS FOR CUTTING AND SCREWING TUBES AND RODS, AND
FOR SCREWING UP TUBES."
The apparatus in one of its forms as a cutting tool consists of a headstock to
receive the rod or tube provided with a lever handle. At the top of the headstock
is a boss tapped with a female screw and grooved on one side to receive a flat
sliding cutter, which is kept in position by a metal plate screwed to the boss; the
upper end of the cutter is bent over at right angles, and is received by a collar
formed on a male screw which passes through the head of the cutter and through
the female screw on the boss on the headstock, so that by turning this screw the
pressure of the sliding cutter is brought upon the rod or tube which is in the grip
of the headstock, and turning the tool round effects the cut as in the usual tool
with rotary cutters, the sliding cutter being advanced upon the rod or tube as
greater depth is required by the action of the screw through the boss carrying the
cutter lower down, and thus deepening the cut on the tube or rod.
I will now proceed to describe my Invention more fully with the aid of the
annexed Drawings, in which,
Figure 1 shews a view of the tool with one cutter.
Figure 2, an enlarged elevation of the cutter.
Figure 3, an enlarged elevation of the setting screw.
Figure 4, a plan of the top of the cutter.
Figure 5, an elevation of a tool of a modified form to the above, but with the
same description of cutter.
Figure 6, a section through the head of Figure 5.
In Figure 1 (a) is the headstock receiving the rod or tube (b) and furnished with
the lever handle (c); (d) is the boss tapped for a screw and grooved on one side to
receive the flat sliding cutter (e) which is kept in position by the metal plate (f);
(g) Figure 2, seen enlarged in (plan Figure 4), is the form of the head of the cutter
bent to a forked flange to pass over the collar (h) on the screw (i), see Figure 3),
so that by turning the screw (i) the pressure of the cutter (e) on the tube or rod (b)
is governed. Figures 5 and 6 shew a modification of the tool already described in
which the setting screw and cutter are placed at the side and two rotary cutters;
or, if preferred, friction rollers (k, k,) are mounted in the opposite jaw and adjusted
by the set pin (l).
Another form of the apparatus adapted for cutting and screwing rods or tubes
consists of a double jawed head similar to that of a pair of gas tongs, and capable
of opening and closing upon a pin joint; one jaw is lengthened to form a strong
lever handle, and the other is extended to a short distance below the pin joint and
formed into a boss to receive an adjusting set screw, by which the jaws may be
opened and closed; or this set screw may be made to work through the head of the
jaws instead of the foot; or the jaws may be pinned at the head and have the
adjusting screw at the foot. Inside the jaws cutters are fixed, and I prefer three
cutters set as nearly as may be equidistant and following each other. When the
apparatus is used for cutting but for screwing a thread on a tube or rod, either two
dies and a cutter or one die and a cutter may be used and not to follow each other in
order to cut a thread, the grip being increased as required by the adjusting set screws
before named. The cutter herein described as a flat cutter may be of any other
suitable form, so that it be not rotating, but is capable of being adjusted and set.
In applying my Invention to gas tongs for screwing up tubes I use either of
these forms of apparatus without dies or cutters, and the jaws toothed or roughed as
may be required, the grip governed by a set screw as before named,

page_text: Having thus described the nature of the said Invention, and in what manner the
same is to be performed,-
I claim the improvements in apparatus for cutting and screwing tubes and rods
by the employment of a flat or non-rotating fixed cutter of any suitable edge form
capable of being mounted and adjusted in manner shewn, and either with or
without rotating cutters, dies, or friction rollers, and for screwing up tubes, the
apparatus without cutters or dies, substantially as herein more fully set forth and
specified.
In witness whereof, the said William Crow hath hereunto set his hand and seal,
this Nineteenth day of June, in the year of our Lord One thousand eight
hundred and seventy nine.