Improvements in Pipe or Tube Cutters.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Pipe or Tube Cutters.
I, ANDREAS GEORG HEINRICH WILHELM KLAGGES, of 83, Billhörner Mühlenweg,
Hamburg, Germany, Machinist, do hereby declare the nature of this invention to
be as follows;
This invention relates to pipe or tube cutters the essential characteristic of which
is that each cutter is provided with a knife which can be pushed forward by
means of a wedge to such an extent as to pass through the wall of the tube to be
cut so that on then rotating the tool the tube will be cut off completely at one
operation.
Two examples of such cutters are represented in the accompanying drawings.
Fig. 1 shows a cutter with an outwardly working knife, partly in longitudinal
section and partly in side elevation, and
Fig. 2 is partly an elevation thereof and partly a section corresponding to the
line A B of Fig. 1.
Figs. 3 and 4 show in elevation and in section a pipe or tube cutter with an
inwardly working knife.
:
For cutting tubes that are not accessible on their outsides (for instance, for
cutting the fire-tubes out of boilers) the cutter comprises a cylindrical body b
formed at its front end with a squared portion a, and having a groove c in which
is arranged a knife d that can be pushed forward by means of a wedge 9 mounted
in the bore f of the cylinder.
Upon the cylindrical body on each side of the knife there is mounted an anti-
friction-roller or i which bears against the tube to be cut. These rollers are
prevented from shifting longitudinally by rings k and l.
When, however, it is desired to cut through tubes which are accessible on their
outsides, the modification represented in Figs. 3 and 4 is employed. This comprises
an annular body m which is provided with a shank and in which there are arranged
a knife n and antifriction-rollers o. The knife is likewise in this modification
pushed forward by means of a wedge 2, which is driven through a suitably pro-
vided hole in the body m.
In use, the cylindrical body is placed in the tube to be cut so that the periphery
and the front collar of the roller bear against the tube. Then the wedge g is
driven into the body so as to drive the knife through the wall of the tube.
When this has been done, the tool is revolved once, whereby the tube is cut off, a
chip of the thickness of the knife being cut out of the entire periphery of the tube.
The mode of using the modification shown in Figs. 3 and 4, is exactly similar,
with the exception that the annular body m is slipped over the tube, and the knife
is driven from the outside towards the inside through the wall of the tube.
The advantages of a tool such as those described are that the knife effects an
actual cutting and not a squeezing or crushing as is the case with cutting rollers,
so that even tubes that are fixed at both ends and that therefore are unable to
expand longitudinally, can be easily cut; and that the operation can be effected

page_text: very rapidly because it is only necessary to rotate the tool once, whilst repairs
such as are rendered necessary by breakages of the pins of cutting rollers and of
the cutting rollers themselves, are entirely obviated.
Dated this 18th day of January 1898.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agents for the Applicant.
I, ANDREAS GEORG HEINRICH WILHELM KLAGGES, of 83, Billhörner Mühlenweg,
Hamburg, Germany, Machinist, 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:-
This invention relates to pipe or tube cutters the essential characteristic of which
is that each cutter is provided with a knife which can be pushed forward by
means of a wedge to such an extent as to pass through the wall of the tube to be
cut so that on then rotating the tool the tube will be cut off completely at one
operation.
'
Two examples of such cutters are represented in the drawings filed with my
Provisional Specification.
Fig. 1 shows a cutter with an outwardly working knife, partly in longitudinal
section and partly in side elevation, and
Fig. 2 is partly an elevation thereof and partly a section corresponding to the
line A B of Fig. 1.
Figs. 3 and 4 show in elevation and in section a pipe or tube cutter with an
inwardly working knife.
:
For cutting tubes that are not accessible on their outsides (for instance, for
cutting the fire-tubes out of boilers) the cutter comprises a cylindrical body b
formed at its front end with a squared portion a, and having a groove c in which
is arranged a knife d that can be pushed forward by means of a wedge g mounted
in the bore f of the cylinder.
:
Upon the cylindrical body on each side of the knife there is mounted an anti-
friction-roller h or i which bears against the tube to be cut. These rollers are
prevented from shifting longitudinally by rings k and 1.
When, however, it is desired to cut through tubes which are accessible on their
outsides, the modification represented in Figs. 3 and 4 is employed. This comprises
an annular body m which is provided with a shank and in which there are arranged
a knife n and antifriction-rollers o. The knife is likewise in this modification
pushed forward by means of a wedge p, which is driven through a suitably pro-
vided hole in the body m.
In use, the cylindrical body b is placed in the tube to be cut so that the periphery
and the front collar of the roller h bear against the tube. Then the wedge g is
driven into the body b so as to drive the knife through the wall of the tube.
When this has been done, the tool is revolved once, whereby the tube is cut off, a
chip of the thickness of the knife being cut out of the entire circumference of
the tube.
The mode of using the modification shown in Figs. 3 and 4, is exactly similar,
with the exception that the annular body m is slipped over the tube, and the knife
is driven from the outside towards the inside through the wall of the tube.

page_text: The advantages of a tool such as those described are that the knife effects an
actual cutting and not a squeezing or crushing as is the case with cutting rollers,
so that even tubes that are fixed at both ends and that therefore are unable to
expand longitudinally, can be easily cut; and that the operation can be effected
very rapidly because it is only necessary to rotate the tool once, whilst repairs
such as are rendered necessary by breakages of the pins of cutting rollers and of
the cutting rollers themselves, are entirely obviated.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. A pipe or tube cutter consisting of or comprising a cylindrical or annular
body (6 or m) in which is arranged a fixed knife (d or n) adapted to be pushed
forwards by means of a wedge (9 or p) from the inside outwardly, or from the
outside inwardly substantially as described.
2. Pipe or tube cutters constructed and operating substantially as shown in and
described with reference to Figs. 1 and 2 and to Figs. 3 and 4 respectively of the
drawings.
1
1000
F. WISE HOWORTH,
Agent for the Applicant.