Improvements in Milling and like Cutters.
Year: 1888

page_text: Date of Application, 17th Dec., 1888
Complete Specification Left, 23rd July, 1889-Accepted, 24th Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements in Milling and like Cutters.
1 GEORGE ADDY Steel Traveller 630 Ecclesall Road Sheffield do hereby declare
the nature of this invention to be as follows :-
My Invention consists in using a large Sleeve or Boss made of Mild Steel, Iron or
other suitable cheap material which fastens on the driving spindle of Milling Machine
and then fastening on this Sleeve or Boss by means of one or more keys and nut and
washer the halves of a Milling Cutter with a diagonal joint so as to allow of packing
being inserted when necessary to take up wear. I claim by this invention to
materially reduce the first cost of Milling and like Cutters by using the large Sleeve
or Boss made from cheap material in combination with Cutter Rings of high class
steel made in diagonal halves so as to allow of packing out when worn-the ordinary
practise being at the present time for the Cutters to be made entirely of high class
Steel and fastened on to the driving spindle direct, this being an expensive and
wasteful method-By my invention this wasteful system is no longer necessary.
Dated this 15th day of December 1888.
COMPLETE SPECIFICATION.
Improvements in Milling and like Cutters.
I, GEORGE ADDY, Steel Traveller, 630 Ecclesall Road, Sheffield 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:
My invention of improvements in milling cutters and other like cutters, consists
more particularly in the use of a sleeve or boss made of mild or cheap steel, iron, or
other suitable material, forming a large part of the central portion of the cutter, in
combination with a cutter or cutting disc or annular rim, arranged so that it can be
expanded when necessary.
In order to render my invention clear, I have annexed a number of drawings which
illustrate various modifications of cutters made according to my invention.
Figs. 1 & 2, are a sido elovation, and transverse section of a Cutter, made according
to this invention, with a plain diagonal division.
Figs. 3&4, similar views of a cutter with a doublo diagonal division.
Figs. 5 & 6, similar views of a cutter with a waved division.
Figs. 7&8, similar views of a cutter with a sorrated or stepped division.
Figs. 9 & 10, similar views of a Cutter with a diagonal division, showing the
manner of constructing cutters of large diameters.
In carrying out my invention in the manufacture of an expansible cutter such as
illustrated in Figs. 1 and 2, I make the cutting portion in two parts A and B, which
are preferably facsimiles of each other, the junction C, being made diagonally as
shown, and so as to permit of packing, or extension pieces being placed between them,
when desirable.
I fit these annular toothed rings A, and B, upon a sleeve or boss D, of compara-
tively large diameter, and which may be made of less costly material than the first
class steel of which the cutting parts A and B are made.
The two cutting parts or rings, with or without an intermediate packing, are held
together by means of a fine-thread nut E, and washer F, upon a correspondingly
screw threaded portion of the sleeve or boss D, or by other suitable means, and are
secured upon the mandril or driving axle G. The cutters are prevented turning
round upon the boss by means of a key D¹ or equivalent means.

page_text: Although I have stated the nature of my invention to consist in using a large sleeve
or boss and fixing thereon the halves of a milling cutter with a diagonal joint, it will
be evident that although the diagonal division is the most simple and satisfactory, I
may vary the joint from the strictly diagonal form, and attain the same object or
result without departing from the spirit of my said invention.
Thus in Figs. 3 & 4, I make the division of a double diagonal, or two inclined
faces; while in Figs. 5 & 6, I illustrate a cutter with a waved division, and in
Figs. 7&8, the inner faces of the two cutters are serrated or toothed, the object
of all the various methods described being, to enable the two halves of the cutter
to be packed apart either when reduced by wear, or for other reason, in such a
manner that the cutter will operate without leaving a strip of uncut metal, which
would be the case if the open division was a true circle at right angles to the axis of
the spindle.
In Figs. 9 & 10 I show a different method of securing the parts A & B together,
which is well adapted for cutters of large diameter.
The centre boss D, (which may be reduced in weight by annular recesses such
as H) is formed with a side-plate 1, provided with a number of bolt holes, and
recesses for the bolt heads; also with a vee shaped edge; a ring J with corre-
sponding bolt holes, and vee shaped edge fits tip to the said side-plate or there-
abouts. The parts A & B are each provided with a vee which engago with those
first described in the manner shown, the parts being all held together by the bolts or
screws K.
My invention therefore permits of the cutting parts being made of high class
steel, suitable for such work, and the contral portion of iron or cheap mild steel, upon
which new cutters or toothed rings may be placed as they are worn out, from time to
time.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1-In the construction of Circular Cutters, the combination with a ring shaped
cutting part divided diagonally across its axis for the purpose specified, of a sleeve or
boss constructed to permit the two divisions of the cutting part to be separated and
held apart, substantially as hereinbefore described and shown in Figs. 1 & 2.
2-In the manufacture of Circular Cutters the combination with a ring shaped
cutting part, divided in such a manner as to permit of the two parts being separated
for the purpose specified, of a sleeve or boss constructed to support the cutting parts
and to permit such separation, substantially as herein before described, and shown in
Figs. 3 to 10 inclusive.
Dated the 22nd day of July 1889