Improvements in Cutting Tools for Wood Screws.
Year: 1895

page_text: Date of Application, 22nd Nov., 1895-Accepted, 1st Feb., 1896
COMPLETE SPECIFICATION.
Improvements in Cutting Tools for Wood Screws.
We GUSTAV KLEINE and WILHELM FALKENROTH of Schwelm in the German
Empire, Manufacturers 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 :-
For cutting automatically wood screws there are hitherto used tools forming
part of a ring which is provided with an edge that is determined by the diameter
of the screw shaft and the contiguous threads. This tool is fastened to a special
holder and carried along the shaft of the screw 10-12 times, whereby it will be
pressed at the same time towards the shaft.
It will be clear that in such a manner plenty time is required to cut a wood
screw, which cannot be shortened by diminishing the number of cuts as in such a
case the shaft would not resist the increased pressure and break and the tool itself
would soon be damaged.
Our invention relates to such improvements in cutting tools by which the wood
screw is cut in half the time now used without having the drawbacks mentioned
above.
In order that this our said invention may be fully understood we shall now
proceed particularly to describe the same and for that purpose we shall refer to
the several figures, in the sheet of drawing hereunto aunexed, the same letters of
reference indicating corresponding parts in the figures.
Figures 1 and 2 show the manner of producing our new tool;
Figure 3 is a side view of the tool ;
Figure 4 shows its working;
Figure 5 is a front view of the tool;
Figure 6 shows the old tool.
Instead of giving the tool only one profiled edge as it is shown in Figure 6 we
provide the same with a second one so that the tool has now two edges or two
combined chisels A and B, the first of which stands a little back compared with
the other, which however in its side edges is formed a little broader. The first
edge therefore begins the work and the second finishes it or the first makes the
roughly turning and the second the smooth turning operation.
Now it will be clear that the work of cutting being else done by one chisel by
using two chisels is divided and done in half the time so that the tool now must be
carried along the screw shaft only 5 or 6 times which is of great importance
in the manufacture of wood screw as it often happens that in one establishment
400 and more automatic wood screw cutting machines are in motion.
The tool itself will also not be much fatigued so that it may be used a considerable
time and plenty of material will be spared.
Figures 1 and 2 show the best manner of producing practically said chisels. For
this purpose we turn out a hollow cylinder, the outer surface of which is provided
with profiled edges by turning or shaping. Then the cylinder is cut in ring and
each ring is divided in 3 or 4 pieces, forming the single tools. Such a tool is then
fastened in a holder which is arranged in the wood screw cutting machine and
which is provided with a groove, for taking up the tool, that is pressed very fast
in the same by a lid, for which purpose one edge X of the tool is inclined.
It is of course possible to provide the tool, instead of with two, with three and
more edges which will be of great advantage in the manufacture of heavy wood

page_text: screws as carriage screws, and the like; for small wood screws however a chisel
with two edges is sufficient.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
⚫claim is :
A cutting tool used in automatic wood screw cutting machines having two or
more edges according in form to the screw thread in such a way that the front
parts of the several edges are arranged in steps and the side parts of a following
edge are broader than the same of the foregoing edge in order to cut the thread
successively in half the time hitherto used.
Dated this 19th day of November 1895.
GUSTAV KLEINE,
WILHELM FALKENROTH,
By A. Daumas,
Agent for Applicants.
GUSTAV KLEINE,
WILHELM FALKENROTH,
By A. Daumas,
Agent for Applicants.