Improvements in Tools and Tool-holder for Planing, Boring, and Turning.
Year: 1892

page_text: Date of Application, 10th Sept., 1892-Accepted, 3rd Dec., 1892
COMPLETE SPECIFICATION.
Improvements in Tools and Tool-holder for Planing, Boring, and
Turning.
I, NEWNHAM BROWNE, of 73, Cheapside, in the City of London, Fellow of the
Chartered Institute of Patent Agents, do hereby declare the nature of this inven
tion, which has been communicated to me by Friedrich Bernhard Fischer, and
Gustav Adolph Hugo Winsch, both of Zwickauerstrasse 41 Dresden, A, in the
Empire of Germany, Manufacturing Engineers, and in what manner the same is
to be performed to be particularly described and ascertained in and by the following
statement :-.
Tools of the above kind consist, as is well known, of two chief parts.
1. The disc-shaped tooth.
2. The handle wherewith it is fixed in the machine.
The first of the improvements, herein described, has reference to the disc-shaped
tooth and has for its object to facilitate the grinding of the same, hitherto
accomplished with great difficulty. The difficulty in grinding the cutting edge is
chiefly to be found in gaining access to, or acting upon, the material in the rounded
base or bottom of the cutting notch, as the edges of the grinding stone used for
this purpose, or of the emery disc are rapidly worn out.
To facilitate the operation of grinding at the critical points, that is to say at the
rounded base of the cutting edge, an improvement is devised whereby the steel in
this part of the cutting disc is, to a great extent, so treated that either:
As shown in Fig. 1 of the accompanying drawings a number of holes a¹ are formed
close together in the cutting-disc a, in such a manner that each hole takes the same
place as where, after repeated grindings, the rounded base of the cutting noteh will
be found, or: As shown in Figs. 3 and 4 of the drawings, grooves d are formed in
the sides of the cutting disc at the parts in question.
In both cases, the grinding, or cutting stone, finds less material to grind off in the
critical parts and hence the grinding is more casily performed.
The second improvement in tools having disc shaped cutting tooth, relates to the
handle used to fix the tool in the machine and has for its object to enable
the cutting tooth to be placed opposite the piece operated upon in the slant position
required for the work to be done that is to say where the biting takes place.
For this purpose the handle is made to assume a cylindrical shape. To fix the
same in position we use a clamp, which has a quadrangular form, outside, i.e. in
cross section, and is furnished, in the direction of its longitudinal axis, either with a
circular or a square hole c', the diameter of which corresponds to that of the
handle. This clamp e is divided in its horizontal, or longitudial direction, as shown
in full lines, on one side; or, as shown in dotted lines on two opposite sides. As
the handle, or stem, b may be turned in either direction in the clamp c and can be
harnessed in the tool holder, by compressing the clamp, in every position required
therefor, the arrangement hereinbefore described enables the disc-shaped tooth fixed
to the handle b to be placed in any suitable slant direction, or biting position such
as in the position shown in dotted lines in Fig. 2 according to the class of work
required.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondents I declare that what I claim is:
In turning, planing and boring tools having a disc-shaped cutting tooth the
following improvements viz.:
1. The perforations a¹, or as a substitute therefor, the grooves d, formed in the

page_text: disc a of the circular cutting tooth for the purpose of facilitating the grinding of
the cutting edge.
2. The clamp
c embracing stem by means of a round or square hole c¹
admitting rotation of the stem in every direction and consisting of one or two parts
by means of which clamp the disc like cutter can be adjusted to any desired oblique
position with reference to the handle or stem.
Dated the Tenth day of September 1892.
NEWNHAM BROWNE.