AN IMPROVED OUTTING OR TURNING TOOL FOR USE IN LATHES to be as follows:
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I HANS RENOLD of Green Lane in the City of Manchester, in the County of
Lancaster, Machine Maker, do hereby declare the nature of the said invention
for "AN IMPROVED OUTTING OR TURNING TOOL FOR USE IN LATHES to be as
follows:-
"
My invention relates principally to the cutting tools ordinarily known as
parting or cutting off tools. Such tools are ordinarily made by reducing the end of
a bar of tool steel to obtain a narrow cutting edge. In my improved cutting tool
I use a thin bar or strip of steel of an uniform section from end to end. The sides
of this strip are slightly concave and one edge is slightly narrower than the other
the wider edge furnishing the cutting edge. This strip of steel is suitably hardened
and tempered and is clamped in a planed or cut groove in a holder which is formed
with a planed projecting rib which when the tool is in use rests on the tool slide
and is clamped thereon as in the case of an ordinary tool. The part of the holder
in which the said groove is formed extends down below or partly below the top of
the tool slide so that the end of the cutter can be brought to a suitable position to
act with the best effect the cutter being inclined with relation to the surface of the
tool slide so as to obtain a good angle for cutting. The cutter is clamped by means
of two bolts having heads partly projecting over the cutter or by other suitable
means. The cutter can be used for a very long time requiring only to be ground
at the end at intervals. The tools may be used for some purposes other than the
ordinary purposes for which parting tools are used.

page_text: "
I HANS RENOLD of Green Lane in the City of Manchester in the County of
Lancaster Machine Maker do hereby declare the nature of the said invention for
"AN IMPROVED CUTTING OR TURNING TOOL FOR USE IN LATHES and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement and accompanying drawings:-
My invention relates principally to the cutting tools ordinarily known as parting
or cutting off tools. Such tools are ordinarily made, by reducing the end of a bar
of tool steel to obtain a narrow cutting edge. In my improved cutting tool I use
a thin bar or strip of steel of an uniform section from end to end. The sides of
this strip are slightly concave and one edge is slightly narrower than the other
the wider end furnishing the cutting edge. This strip of steel is suitably hardened
and tempered and is clamped in a planed or cut groove in a holder which is formed
with a planed projecting rib which when the tool is in use rests on the tool slide
and is clamped thereon as in the case of an ordinary tool. The part of the holder
in which the said groove is formed extends down below or partly below the top
of the tool slide so that the end of the cutter can be brought to a suitable position
to.act with the best effect the cutter being inclined with relation to the surface of
the tool slide so as to obtain a good angle for cutting.
The form and construction of my Improved tool will be more fully comprehended.
when reference is made to the accompanying Sheet of drawings, wherein Fig: 1. is
a side view Fig: 2. à plan and Fig: 3. a front end view of the tool. In in the said
Figs: a. is the steel cutting tool proper and b. is the holder which is also
represented in cross section (taken at the line A, B in Fig. 1) by Fig: 4. For
convenience of formation this holder may be cast in iron steel or gun metal but I
do not confine myself to the use of any particular material for this holder. The
holder is planed at 61 and 6' the planed surface b¹ resting upon the top of the tool
slide of the lathe and the surface 6ª against the side of the said slide the holder
being clamped upon the slide as in the case of an ordinary tool. In Fig: 1. the
line of top surface of the tool slide is indicated by the dotted line c. On the outer
side of the tool holder a channel d is planed this channel receiving the steel cutting
tool a.
This channel is formed with raised edges to support the cutting tool and is
inclined with relation to the surface of the tool slide as clearly indicated in Fig: 1.
This inclination of the channel accompanied by the depression of the rear end of
the tool below the tool slide top brings the cutting edge of the tool to a suitable
cutting angle without raising it too high with relation to the lathe centres The
cutting tool is tightly clamped to the holder by means of two bolts f. f¹. which
are formed with long heads which project a little over the tool and are prevented
from turning by means of lips b³ which project from the body of the tool holder.
When the bolts are tightened by means of the nuts seen in Fig: 3. the tool becomes
tightly clamped to the holder. If preferred the head of the bolt f¹ may be beveled
so as to jam the tool upward against the top edge of the channel. Any other
suitable means for clamping the tool may be adopted The formation of the
cutting tool a. has already been set forth herein and is indicated in Fig: 3. but I do
not make any claim for the use of this particular section of steel apart from the
holder. A great advantage arising from the use of such a cutting tool ground
milled or shaped to an uniform section from end to end is that it can be used for a
very long time requiring only to be ground at intervals so as to remove a portion
of the extreme cutting end and thereby to slightly reduce its length until by
repeated grindings the tool has become too short to be tightly clamped in the
holder.

page_text: 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 claim is:
.
1. The improved tool consisting of the strip of steel of uniform section from end
to end clamped in or to the improved holder substantially as and for the purposes
set forth and indicated.
2. A tool for use in lathes consisting of a strip of steel a. of the formation herein
set forth clamped in an inclined direction to a tool holder and to a part which
descends below the tool slide top when the holder is clamped thereto substantially
as set forth and indicated.
3. The holder b. formed with a downward projection on the outside of which is
planed or formed an inclined channel in which a strip of steel can be clamped
substantially as and for the purpose set forth and indicated.