An Improved Turning Tool.
Year: 1892

page_text: Date of Application, 12th July, 1892
Complete Specification Left, 7th Dec., 1892-Accepted, 21st Jan., 1893
PROVISIONAL SPECIFICATION..
An Improved Turning Tool.
I, CARL BERLE of Leerbachstr., Frankfurt / M. in the German Empire,
Banker, do hereby declare the nature of this invention to be as follows:-
The tool of this invention has the form of a spirally grooved round steel bar the
cutting edge being a portion or side of the groove at the outer end of the bar and
lasting until the whole of the spiral groove is ground away from the outer or cutting
end of the same.
The cross sectional form both of the bar and groove may be varied.
Dated this 12th dow of Iul 1909
CAPITAINE & VON HERTLING,
89, Chancery Lane, London, W.C., Agents for the Applic
COMPLETE SPECIFICATION.
An Improved Turning Tool.
I, CARL BERLÉ of Leerbachstr., Frankfurt ; M. in the German Empire,
Banker, 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 tool of this invention has the form of a round spirally grooved steel bar the
groove of which may be of circular or other suitable cross sectional form according
as the cutting edge has to be more or less angular from the point to the outside and
suitable for the particular work and material.
In the drawing
Fig. 1 is an outside view of the turning tool of this invention,
Fig. 2 an upper end view thereof,
Fig. 3 a similar tool held in parallel pieces or jaws ready for placing in a slide
rest of a lathe or like appliance and
Fig. 4 is a section through line ab of Fig. 3.
a is the spiral groove of such a kind that by simply grinding the front end
angularly a cutting edge 6 which is excentric to the outside circumference or body
of the tool may be produced from time to time until the tool is ground away in the
whole length of the groove. The groove forms a good channel for guiding or
leading off the turnings. The tool differs substantially in principle from the single
or multiple grooved drill in that the point c of the cutting edge is not in the
longitudinal axis of the bar, by reason of which excentric position, the cutting
edge b has at its back parts that kind of cutting edge inclining in two directions
relatively to the longitudinal axis, which is the main requirement in the production
of a good, easy cutting and lasting cutting edge. The tool may be held in any
suitable slide rest or support by means of jaws d and, as is obvious, its cutting edge
may be precisely adjusted to the required height by merely turning the tool round
on its longitudinal axis without any extra packing.
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 :-
A turning tool consisting of a grooved steel bar with cutting edges excentric to
the same, inclined in two different directions, the groove forming a channel for

page_text: guiding or leading off the turnings, the tool being held in position by jaws d in
which it may be adjusted to the cutting height by turning it round on its
longitudinal axis, substantially as described and shewn.
Dated this 7th day of December 1892.
CAPITAINE & VON HERTLING,
89, Chancery Lane, London, W.C., Agents for the Applicant.