Improvements in Metal Turning Tools
Year: 1899

page_text: Date of Application, 1st Sept., 1899-Accepted, 21st Oct.,
1899
COMPLETE SPECIFICATION.
Improvements in Metal Turning Tools
I, JOSEPH NORMAND, 87, South Factory Street, Springfield, Ohio, U.S.A,
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:-
This invention relates to tools for turning metals and it has for its object to
improve their construction.
At present the cutter is apt to slip in the jaw of the holder Under my inven-
tion, in order to prevent this, I serrate the cutter and the holder or the jaw or
cap of the holder in such manner that the cutter can be effectually locked and
held in place My invention also comprises certain improvements in the con-
struction of the holder.
In order that my said invention may be properly understood I have hereunto
appended an explanatory sheet of drawings, whereon,
Fig 1 is a side view of the improved tool holder and cutter.
Fig. 2 18 a plan view of the same.
Fig. 3 18 a view of the holder showing the jaw and cutter removed
Fig 4 is a side view and Fig. 5 a section of the cutter
Fig. 6 is a view of one side and Fig 7 a view of the other side of the jaw
Referring to the drawings whereon the same reference letters wherever repeated
indicate the same parts:
The cutter a consists of a rectangular bar of tool steel shaped with a cutting
point in the usual manner Such cutters are generally known as Diamond
point cutters." Under my invention I form one edge or angle 6 of the cutter
with a series of teeth, nicks, projections, or equivalent c.
The holder d is made, near its end, with a lateral projection or extension e
which 18 curved as shown at Fig 3. The extreme end of the holder 18 made to the
proper angle and has a V shaped groove f for the reception of the cutter a As
shown clearly at Fig 3 the bottom of the V groove 18 made with a series of teeth,
nicks, projections or equivalent g corresponding to the teeth or equivalent cof
the cutter a A hole is made in the end of the holder for the reception of the
screw i
The end of the holder 18 cut away or recessed along the line, to a depth
sufficient to receive the jaw k but not to materially weaken the holder. The
shoulder of the thicker part of the holder is cut away at a slight bevel as indi-
cated at Figs 2 and 3.
The jaw is made of a somewhat elongated shape and fits snugly upon the
cut out end of the holder as shown at Figs 1 and 2° A V shaped groove f¹ cor-
responding to the V shaped groove f of the holder, is made in the jaw, in which
also a screwed hole k', corresponding to the hole h, 18 also made for the reception
of the screw 2
After the cutter is fixed in the groove f, with the teeth meshing with each other,
the jaw is fitted over it and firmly secured in position by means of the screw i.
Owing to the countersunk or cut out part of the holder in which the jaw k fits

page_text: the latter increases the thickness of the end of the tool to but a very slight extent
as will be clearly seen from Fig 2.
The jaw is made with a raised part or edge, on the inside, at its extreme
end so that it only bears (by its V groove f¹) against the cutter at one end and
against the holder (by the edge 4) at the other end the intermediate portion being
out of contact with the holder (see Figs 2 and 7) It will also be that the jaw
is elongated laterally and so made, that a line drawn through the centre of the
screw and of the curved end of the jaw and the extension of the holder is at
or about right angles to the longitudinal axis of the cutter. This construction
of jaw combined with the special construction of holder enables the fulcrum
point () of the jaw to be extended back, comparatively speaking, some consider-
able distance from the cutter so that the necessary leverage 18 given to the jaw
without the necessity for extending it down the longitudinal surface of the shank
of the holder which has heretofore been done in some cases and which is objection-
able owing to the fact that the cuttter cannot then be brought close up to the
tool post
With my improved construction not only is a considerable leverage
given but the jaw is fully supported by the shoulder of the holder and these
advantages are gained without either materially lessening the available length
of the shank of the holder or materially increasing the thickness of its end
Another feature is that by supporting the jaw at only one point or fulcrum ()
instead of over its whole surface it can be readily adapted to firmly grip steel
cutters which may vary slightly in thickness
If so desired the cutter might be seriated on one edge and the ✓ groove of
the jaw correspondingly serrated instead of the V groove of the holder; or, if
80 desued, both the jaw and the holder can be seirated and the cutter serrated
on two opposite edges, in this case, however, care must be taken to make the
serrations so as to properly register with one another when the cutter 18 fixed
in place.
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 consider novel and desire to claim 18.
-
1. A cutter made with serrations, nicks, projections or equivalent for the pur-
pose of enabling it to be securely held in place in its holder, substantially as
set forth.
2. The combination with a cutter which is made with serrations, nicks, pro-
jections or equivalent of a holder (or the jaw of the holder) made with corres-
ponding seriations, nicks, projections or equivalent, substantially as and for
the purpose set forth.
3. The combination with a rectangular cutter made with serrations, nicks,
projections or equivalent, of a holder made with a V groove having corresponding
serrations, nicks, projections, or equivalent, substantially as and for the purpose
herein before set forth.
4 The holder with its removable jaw both made substantially as herein before
described and as shown on the diawings annexed
5 The turning tool, comprising the serrated cutter, the holder and the jaw all
made substantially as hereinbefore described and shown on the drawings annexed
Dated this 31st day of August 1899.
HD FITZPATRICK,
100, Wellington Street, Glasgow, Agent