Year: 1887

page_text: Date of Application, 19th Sept., 1887
Specification Accepted, 25th Oct.. 1887
I LEOPOLD LIEBRECHT, Manufacturer of Berlin, in the Kingdom of Prussia and
German Empire, do hereby declare the nature of my said invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
The object of the present Invention is to construct an apparatus by which solid
bars or shafts and tubes can be cut by hand in a similar manner to that of cutting
by a lathe.
An apparatus constructed according to this Invention is illustrated in the annexed
Drawings in which
Figure 1 is a side elevation, and
Figure 2 a front clevation partly in section.
The apparatus consists of a hook shaped jaw a and a tool holder adjustable on
the former by the aid of a screw rod s. The latter is composed of two parts (see
Figure 3) which clasp the jaw a and are connected to each other by screws d.
Between the parts of the tool holder is inserted the tool, or cutter c which can be
changed and serves for cutting the bar or tube. The cutter e consists of a steel
plate (Figure 4) of 2 to 3 centimeters thickness and is provided on one edge, or both
edges in the middle with a round notch c³ and is inclined on these edges in such a
way that a cutting point c¹ is formed. The cutting point al projects above the second
point (formed by the notch e³) to an amount equivalent to the thickness of the cut
to be taken off by the tool when cutting the bar, or tube.
When employing this instrument, it must always be turned only in one and the
same direction around the bar, or tube and the screw s may be fed up once in a turn.
The tool being once carried around the object to be cut, the point will catch in the
notch thus produced and will serve as a guide to the edge so that it will not be
necessary, as, for example is usually the case in ordinary pipe cutters, to move the
apparatus repeatedly to and fro to obtain a guide for the tool by the portions, or parts
behind the point of it. In consequence of the absolute guiding of the cutter, or
tool massive shafts, or bars can be cut by hand just as smoothly and rapidly as was
hitherto only possible by the aid of a lathe. These instruments are equally applicable
for cutting pipes and tubes as solid bars, or shafts.
In cases where the hand apparatus described and illustrated in Figures 1 to 1
cannot be used for want of space on a pipe, tube, or shaft to be cut a modified form
of it which is illustrated on sheet 2 Figures 1 to 3 may be employed.
Figure 1 shows this modification in a longitudinal section.

page_text: Figure 2ª is an outside view thereof and
Figure 3 shows a section through the mechanism which effects the operation of
the cutter.
This modified form of apparatus consists of the jaw, or head a¹ a² separated into
two parts, which are capable of a rocking motion upon a hinge f and held together by
means of a scrow g and thumb screw /.
The cutter e is guided in the rectangular space of the portion a¹ by means of the
cheeks and which cheeks can be moved up, or down by screwing the adjusting
screw more, or less into, or out of the checks and . On both sides of the
parts a a² there are provided annular grooves and ratchets Figure 2. Into these
grooves fit and work the guide pins m and into the ratchets fit the pawls n of the
lever o, the pawls n being attached to the lever by and moveable round the pin p are
pressed by means of the spring q always against the ratchets l.
When using the apparatus the pipe or the shaft to be cut is introduced between the
parts a a previously opened for this purpose. These head parts a a¹ are then
fastened securely together by the thumb screw h.
Then the cheeks bb' which are holding the cutter c¹ are screwed down by means of
the adjusting screw i until the cutter catches the pipe, or shaft to be cut. Now the
apparatus works exactly like a ratchet drill. The handle a which is screwed into and
forms a part of the lever o being pushed forward the pawls n will engage with the
ratchets and will thereby carry with it the two parts a¹ a² and cause the cutter c
to catch the shaft to be cut.
When drawing back the handle a the pawls will glide over the ratchet teeth but
will engage with fresh ratchet teeth when again pushed forward. The space that is
necessary for the apparatus, when cutting a pipe, or shaft, is not larger than the head
parts of the apparatus; therefore the apparatus is more especially applicable for
cutting moving parts, or under similar conditions in which the screw rod s of the
hand apparatus set forth with reference to sheet 1 of the Drawings cannot be carried
round the pipe, or shaft to be cut.
To the periphery of the parts a' a² are fitted cheeks by which the screw g and
the thumb screw h are guided and borne when screwing together the said two
parts a¹ a².
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what I
claim is
1. An apparatus for cutting solid bars or shafts and tubes in which the cutting
tool consists of a steel plate provided with a notch c³, a cutting point c¹ and a
bearing edge c² the latter being arranged somewhat below the level of the cutting
edge and serving as a guide during the cutting as, or substantially as set forth.
2. The modification set forth with reference to sheet 2 of the Drawings consisting
of the two parts a' a² having an annular groove and ratchets and connected
together and opening by a hinge f and fastened together by the screw and thumb
screw, or their equivalent, the cutter e guided by cheeks constructed and
operating substantially as set forth.
3. The combination of the lever o and pawls n with the parts a¹ and a ratchet
guides and grooves & operating substantially as set forth for the purposes
specified.
1005