Year: 1888

page_text: I HERRMANN KÖTTGEN of Berg-Gladbach, near Cologne Germany Manufacturer
do hereby declare the nature of this invention to be as follows:-
According to my invention I construct a tool for cutting metal pipes and rods as
follows.
A claw or loop, open on one side has, passing through an eye at one end thereof
the screw-threaded end of a tubular stem, which is held adjustably within the claw
by a screw nut, which may either bear against the inner face of the eye, or be
situated in a slot formed in the thickness of the eye. Thus by turning the nut after
the insertion of the pipe or rod to be cut into the jaw, the end of the tubular stem,
which is formed with a notch, is moved inwards so as to hold the pipe between its
notch and the opposite notch of the jaw. Within the tubular stem is a rod formed
with a screw thread on its outer end, screwing into a nut, carried by the end of the
stem so as to be rotatable therein by means of an outer extension forming a handle,
the nut being prevented from shifting longitudinally by means of screwed pins on the
tubular sten entering a. circular groove on the nut.
The inner end of the rod is enlarged so as to form a head fitting the bore of the
tubular stem, and having an open slot into which fits the shank of a cutter.
Thus after having secured the pipe in the tool as described, the cutter is advanced
so as to bite into the pipe by turning the nut at the outer end, and such advance is
continued as the tool is rotated round the pipe in the usual manner.
The cutter is by preference so formed that its front cutting edge is situated in the
axial line of the tubular stem and inner rod, and its shank, as also the slot of the
head in which it fits are made with a slight taper in the direction of the thrust of
the cutter, so that by the action of the latter, the shank is secured in the head by a
wedging action.
The cutter is made with a backward extension of tapering thickness, in the same
direction as the taper of the shank.
The jaw of the tool may also be provided with a handle on the side opposite the
tubular stem, to afford additional purchase in turning.
Dated this 22nd day of June 1888.
ABEL & IMRAY,
Agents for the Applicant.

page_text: I, HERRMANN KÖTTGEN of Berg-Gladbach near Cologne Germany Manufacturer
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:
According to my invention I construct a tool for cutting metal pipes and rods as
follows:-
A claw or loop, open on one side has, passing through an eye at one end thereof
the screw-threaded end of a tubular stem, which is held adjustably within the claw by
a screw nut, which may either bear against the inner face of the eye, or be situated in
a slot formed in the thickness of the eye. Thus by turning the nut after the insertion
of the pipe or rod to be cut into the jaw, the end of the tubular stem, which is formed
with a notch, is moved inwards so as to hold the pipe between its notch and the
opposite notch of the jaw. Within the tubular stem is a rod formed with a screw
thread on its outer end, screwing into a nut, carried by the end of the stem so as to
be rotatable therein by means of an outer extension forming a handle, the nut being
prevented from shifting longitudinally by means of screwed pins on the tubular stem
entering a circular groove on the nut.
The inner end of the rod is enlarged so as to form a head fitting the bore of the
tubular stem, and having an open slot into which fits the shank of a cutter.
Thus after having secured the pipe in the tool as described, the cutter is advanced
so as to bite into the pipe by turning the nut at the outer end, and such advance is
continued as the tool is rotated round the pipe in the usual manner.
The cutter is by preference so formed that its front cutting edge is situated in the
axial line of the tubular stem and inner rod, and its shank, as also the slot of the head
in which it fits are made with a slight taper in the direction of the thrust of the
cutter, so that by the action of the latter, the shank is secured in the head by a
wedging action
The cutter is made with a backward extension of tapering thickness in the same
direction as the taper of the shank.
The jaw of the tool may also be provided with a handle on the side opposite the
tubular stem, to afford additional purchase in turuing.
Fig. 1 of the accompanying drawing shews a longitudinal section of the above
described cutting tool; Fig. 2 shews a longitudinal section taken at right angles to
Fig. 1, Fig. 3 is an end view, Fig. 3* a sectional side view, and Fig. 3b a plan of the
cutter, detached, to a larger scale.
K is the claw, or loop through the eye of which passes the threaded end of the
tubular stem a, on which is screwed the nut n so that by turning this, the notched end
of the tube a is forced against the pipe R to be cut so as to hold this between its
notch and the angle of the claw K. Within the tube a is a stem f, on the upper end
of which is a cylindrical head 6 free to slide longitudinally in the tube a and con-
taining the cutter s; the lower end off is threaded at e and screws into a nut c partly
held in the end of the tube a by screws d' entering a circular groove thereon, so that

page_text: Thus on
the nut can be turned in the tube by hand but cannot shift longitudinally.
turning the nut the stem with head b is forced upward so as to cause the cutter s to
bite into the tube, and on the tool being rotated round the latter, the cutter effects
the cutting thereof.
The head 6 is formed with a transverse slot made slightly taper in width, and into
this slot fits a correspondingly tapered shank m of the cutter s the taper being made in
such a direction that the transverse pressure of the cutter against the tube R in
cutting tends to tighten the shank in the slot, and consequently any additional fixing
of the cutter is rendered unnecessary.
The cutters is so formed that its front cutting edge lies exactly in the axial line of
the tubular stem, and it is by preference made to taper somewhat in thickness from
that point backwards. By this means any frictional contact between the sides of the
cutter and the sides of the circular groove cut on the tube R is prevented, thus
lessening the labor of cutting, and insuring a cleaner cut than is possible with cutters
otherwise formed.
Fig. 4 shews a modification in which the nut n' is situated in a slot in the eye of
the claw K through which the tubular stem a passes, whereby the nut is made to
hold the tubular stem a in the jaw so as not to move longitudinally therein when the
tool has not got a tube or rod inserted for cutting. The stem a is in this case shewn
with a square thread, so as to facilitate its adjustment. The claw K' is shewn with a
threaded socket h, for the insertion of a handle as indicated so as to enable both hands
to be used.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In a cutting tool, the combination of a claw K through an eye of which is passed
the threaded end of a tubular stem a having a notch at its end for holding the tube
or rod to be cut, a nut n for forcing the tubular stem against the object to be cut, a
nute held by the tube a so as to be rotatable therein, and a stem ef screwing into the
S, the slot
nute and having a slotted head 6 into which fits the shank m of a cutter
and shank being tapered so that the pressure upon the cutter, tends to tighten it in
the slot, substantially as described with reference to the drawings.
2. In a cutting tool such as is referred to in the preceding claim, the use of a
cutters forged on the end of a tapering shank m the face of the cutter being in the
axial line of the tube a and its back being made to taper in thickness, substantially as
described with reference to the drawings.
3. In a cutting tool such as is referred to in the preceding claim, arranging the
nut n¹ in a transverse slot in the eye of the claw K, so as to hold the tubular stem a
in position, when the tool is not in use; also, forming the claw K with a threaded
socket h, for the reception of a handle, substantially as described with reference to
Fig. 4 of the drawings.
DI 11: 1911 dan of March 1889