Improvements in and relating to Rotary Cutting Tools.
Year: 1892

page_text: Date of Application, 20th July, 1892-Accepted, 20th Aug., 1892
COMPLETE SPECIFICATION.
Improvements in and relating to Rotary Cutting Tools.
1, JOHANN RICHARD HAUSTEIN, of 9, Moltke Strasse, Chemnitz; in the
Kingdom of Saxony and German Empire, Manufacturer, 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 rotary tools for cutting the teeth of pinions and spur
wheels, or for similar purposes its object being to enable such tools to be readily
made in an ordinary lathe.
A cutting tool constructed according to my invention is represented in the
accompanying drawings, whereof
Fig. 1 is a side elevation, Fig. 2 is a corresponding view of the holder and the
cutting teeth without the sleeve.
Fig. 3 is a cross section on the line 3, 3 (Fig. 2).
Fig. 4 is an end elevation of the holder.
Fig. 5 is a front elevation, Fig. 6 a side elevation and Fig. 7 an end elevation of
one of the cutting teeth.
Figs. 8 and 9 are views corresponding with Figs. 1 and 2, but shewing the teeth
mounted in the holder in which their cutting edges can be produced in an ordinary
lathe.
Fig. 10 is a cross section on the line 10, 10 (Fig. 9).
Fig. 11 is an end elevation of the holder last referred to.
The improved cutting tool comprises a series of teeth A, a holder B and a
sleeve C. Between the teeth and the flange c, a metal washer D and a leather
washer E are placed, so that, when the parts B and C are tightly screwed together,
the series of teeth A may be firmly held in position. The cutting side a of each
tooth lies in a plane which passes through the axis of the tool. The rear side a¹
does not reach to the circumference of a circle struck from a point in that axis.
An arc of the circle is indicated by dotted lines. The arrows y shew the direction
in which the cutting tool rotates.
In forming the series of cutting teeth A, they are placed in a holder B', the
grooves in which are cut at a slightly different angle to those in the holder B.
Thus, when placed in the holder B', the cutting side a of each tooth lies in a plane
which does not pass through the axis of the tool, but is tangential to a small
circle concentric with the arc. Both sides a and a¹ of each tooth extend to the
circumference of the circle of which the arc forms a part. The teeth, when so
arranged in the holder B¹, can be turned in a lathe; the direction of rotation being
indicated by the arrows h.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I claim :-
1. The improved method of making rotary cutting tools substantially as herein
described, whereby the complicated means hitherto employed for the purpose are
dispensed with.
2. The improved rotary cutting tool constructed substantially as described with
reference to the accompanying drawings and comprising a series of separate teeth,
such as A, mounted in a holder, such as B.
3. Forming the teeth for a rotary cutting tool of the kind herein referred to by

page_text: mounting the same in a holder constructed substantially as described with reference
to the accompanying drawings, and then turning them in a lathe.
Dated the 20th day of July 1892.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.