An Improved Gas-pipe Cutter.
Year: 1896

page_text: Date of Application, 24th Oct., 1896-Accepted, 28th Nov., 1896
COMPLETE SPECIFICATION.
An Improved Gas-pipe Cutter.
I, JOSEPH NECHUTINGS, of 24" Wilhelmstrasse, Chemnitz, in the German
Empire, Foreman, 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 :-
The subject of this invention is an improved gas-pipe cutter, the main feature of
which-wherein it differs from similar cutters knowu hitherto-is that the wall of
the pipe is cut through by means of an adjustable cutting jaw or check, part of the
surface of which at the same time rests upon the pipe, and thus affords a point of
support or leverage against the pipe itself, so that the cutting jaw may not
penetrate further into the depth of the material than the distance for which the:
cutting edge or blade projects beyond the above mentioned leverage surface of the
cutting jaw. This jaw is adjustable, as stated, thereby enabling the same cutter
to be rapidly fitted for cutting pipes varying from 20 to 100 millimetres in
diameter.
The cut produced by this improved device is not, as hitherto, slanting, but
straight; nor is it ever notched or jagged, as the cut obtained by the employment
of cutting rollers is not infrequently found to be.
The invention will be best understood by reference to the accompanying drawings,
in which
Fig. 1 is a longitudinal section of one form of my improved gas pipe cutter ;
Fig. 2 is a cross section thereof;
Fig. 3 is another longitudinal section taken at right angles to Fig. 1; and
Fig. 4 is a further longitudinal section of the cutter, which, however, is here
drawn on an enlarged scale, and wherein the positions to be assumed by pipes of
different widths, as well as the corresponding positions of the cutting jaw, are
indicated.
The arrangement is as follows:-
Upon the frame e, a slide or carriage o is adjustably arranged, and adapted to be
shifted backwards and forwards by means of a handle d, fitted in the said frame e
and constructed partly in the shape of a screw spindle. Within the carriage o
there is secured a cutting jaw a, cut away or recessed so as to present a circular
edge extending from g to h. In the centre of this cut away portion is situated the
cutting tooth, which projects beyond the circular edge, which forms the leverage
surface of the cutting jaw, for a distance equivalent to the depth of the piece of
piping to be cut off. The cutting tooth is formed by an inclined tooth b formed in
the cutting jaw, and terminating in a conical perforation k, so that the chip of metal
cut or "shorn" off may enter the slot b and be carried away and discharged
through the perforation k. The radius of the arc of a circle extending from g
to h, in the cutting jaw or cheek a, should in all cases be somewhat larger than the
radius of the pipe to be cut, so that part only of the surface g-h may rest in
contact with the surface of the pipe. The tooth i can only therefore, penetrate
the material to a depth corresponding to its length of projection.
The hook
shaped portion of the frame e is, as usual, fitted with two slide rollers f, which
form the two remaining points of rest or leverage of the gas pipe cutter.
It will be understood that for different diameters of piping differently cut away
cheeks have to be used, so that in all cases part only of the circular leverage
surface may rest in contact with the periphery of the pipe.

page_text: Fig. 4 represents a number of variously cut away cheeks or jaws, fitted for
cutting pipes of different diameters.
The cutting jaw a is adjustable by means of the handle d, no tightening pin or
bolt-such as has hitherto been used in connection with pipe cutters operating by
means of bevel wheels--being therefore required to effect the adjustment here.
All that is necessary is to slightly turn the handle d until the cutting jaw is brought
to the requisite situation. The cutting tooth is protected from breaking through
being overdriven too deeply into the metal, owing to the fact that the cutting jaw
itself forms a third point of support.
The surface of the cut never requires to be polished or finished off with a file, as
it is, from the first, made straight and smooth by the cutter.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim.is:
An improved gas pipe cutter, characterized by a cutting jaw or cheek (such as a)
adjustable by means of a handle (d), the forward end of which is provided with
an inclined or slanting slot (b) leading into a tapering perforation (k), while its
operative surface is cut away circularly and carries a projecting cutting tooth or
blade (), formed by the inclined slot (b); the effect of this construction being,
that part of the cut away operative surface, only, rests in contact with the
periphery of the pipe, while the cutting tooth or blade may enter the metal but to
a depth corresponding to the length of projection; the object of the arrangement
being to enable pipes varying in diameter between 20 and 100 millimetres to be
cut with a straight and smooth cut-without any formation of steps or offsets-
by the simple exchange of the cutting cheek or jaw, substantially as described and
shown in the drawings.
Dated this 24th day of October 1896.
FAIRFAX & WETTER,
433 Strand, London, Agents for the Applicant.