Improvements in Milling Cutters for Metals.
Year: 1892

page_text: Date of Application, 23rd July, 1892
Complete Specification Left, 22nd Apr., 1893-Accepted, 27th May, 1898
PROVISIONAL SPECIFICATION.
Improvements in Milling Cutters for Metals.
I JOHN MCADAM of Sea Terrace Middleton, Hartlepool, in the County of
Durham, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention consists of an improved construction of milling cutters for use in
milling metals.
The cutter consists of a central boss to which the parts forming the cutting edges
are attached, by means of "dove-tails" or slots, and are securely held in place by
hollow conical washers and nuts at each end; the said nuts fitting the ends of the
central boss which are turned and screwed for the purpose.
The cutting parts may consist of two or more segments which fit upon a "dove-
tail" on the central boss, the ends of the said segments being coned to fit into the
conical hollow washers, or of a series of flat pieces of steel which fit into slots in the
boss and have their ends reduced so as to form a wedge like projection which fits as
before into the hollow conical washers.
The cutter is put together as follows:-
The boss being formed as described with "dove-tails" or slots, the segments or
blades are placed in postion. The hollow conical washers.are then placed on the
ends and firmly screwed up against the washers, thus holding the segments or blades
firmly against the central boss. A jam nut or other locking device may be used to
keep all in position.
The cutter is sharpened or ground in the ordinary way in a cutter grinding.
machine.
The boss, washers, and nuts, may be of steel or of any other suitable material,
and the cutter may be formed for attachment to the mandril of a milling machine
in any well known manner.
Dated this 92nd day of July 1892
JOHN M° ADAM.
COMPLETE SPECIFICATION.
Improvements in Milling Cutters for Metals.
I JOHN MCADAM of Sea Terrace Middleton, Hartlepool, in the County of
Durham, Engineer, 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 consists of an improved construction of milling cuiters for use in
milling metals.
"
The cutter consists of a central boss to which the parts forming the cutting edges
are attached by means of "dove-tails or slots, and are securely held in place by
hollow conical washers and nuts at each end; the said nuts fitting the ends of the
central boss which are turned and screwed for the purpose.
The cutting parts may consist of two or more segments which fit upon a
"dove-
tail
on the central boss, the ends of the said segments being coned to fit into the
conical hollow washers, or of a series of flat pieces of steel which fit into slots in
the boss and have their ends reduced so as to form a wedge like projection which
fits as before into the hollow conical washers.
In order that my invention may be fully understood append two sheets of
explanatory drawings.

page_text: Fig. I shows in longitudinal section a milling cutter in which the cutting parts
consist of two or more segments, whilst Fig. II is an end elevation of the same in
one half of which the nuts are shown removed for clearness.
Fig. I shows in longitudinal section a milling cutter in which the cutting parts
consist of a series of flat pieces of steel and Fig. IV is an end elevation of the same
one half of which is in section.
Referring to Figs. I & II. 1 is the central boss to which the cutting parts 2,
consisting of two or more segments, are attached by means of the "dovetails" or
slots 3. The ends of the segments 2 are coned as shown and are securely held in
place by the hollow conical washers 4, 4 and the nuts 5, 5 (which are not shown
in section). Jam nuts 6, 6 or other suitable means may be employed for keeping
the whole in position.
Referring to Figs. III & IV. 1 is the central boss as before with a series of
slots 3 cut in it and into which are fitted the cutting parts 2 which consist of a
series of flat steel plates. (In Fig. III, to avoid confusion of the drawing, only one
of these cutting pieces is shown.) The ends of these steel plates are coned and are
securely held in place by the hollow conical washers 4, 4 and the nuts 5, 5 as
previously described with reference to Figs. I & II.
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 1
claim is:
1
1. A milling cutter consisting of a central boss to which the parts forming the
cutting edges, and which consist of two or more segments, are attached by means
of "dovetails" or slots and which are securely held in place by hollow conical
washers and nuts substantially as illustrated and described.
2. A milling cutter consisting of a central boss to which the parts forming the
cutting edges, and which consists of a series of flat steel plates, are attached in slots
and which are securely held in place by hollow conical washers and nuts substan-
tially as illustrated and described.
Dated this 21st day of Anvil 1002