Improvements in Tool Holders and Tools for Slide Rests of Lathes and for other Metal Cutting Machines.
Year: 1898

page_text: PROVISIONAL
Improvements in Tool Holders and Tools for Slide Rests of Lathes
and for other Metal Cutting Machines.
I, WILLIAM HILLMAN, of 7, The Quadrant, Coventry, in the County of Warwick,
Engineer, do hereby declare the nature of this invention to be as follows:-
The invention relates to that class of tool holders and tools described in the
specification of my Letters Patent No. 615 of 1896 and has for its object to enable
a double ended cutter to be used which may be longer than was possible with the
tool holder described in the aforesaid specification.
By the present invention I avoid the necessity of holding the cutter in a
straight line with the tool holder whilst tightening up the set screw or screws
by which the cutter is held and the tool holder is secured to or on the slide
rest, and I form the cutter of triangular form in cross section which requires
less grinding and is more economical for a given size of tool.
According to one form of my present invention I construct the tool holder of
two separate portions the one having a projecting plate at one side with bevelled
edges sliding in an undercut depression in the other portion.
The curved surface of the upper portion which comes in contact with the tool
is straight or flat in cross section and the lower portion is formed with a curved
V groove into which the tool beds.
In some cases I form the holder of one piece of metal and cut a curved shaped
groove in one side thereof to such depth that only a thin wall of metal is left
on the other side. When the tool is inserted in said groove and the pressure of
the screw or screws applied the thin wall of metal will spring and allow the groove
to contract and grip the tool.
It will be understood that it is not necessary to form the holder so that the
upper or cutting face of the cutter is in a horizontal direction, on the contrary
the grooves in the holder may be formed so that the cutting face of the cutter
is in an inclined direction when so desired.
It will also be understood that as the upper and lower portions of the holder
are only connected at the side, the cutter may be considerably longer than its
The cutter is perfectly sharpened
holder and project from this latter at its rear.
at both ends which may or may not be alike.
1000
HARRIS & MILLS,
23, Southampton Buildings, London, W.C., Agents.

page_text: Improvements in Tool Holders and Tools for Slide Rests of Lathes
. and for other Metal Cutting Machines.
I, WILLIAM HILLMAN, of 7, The Quadrant, Coventry, in the County of Warwick,
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:-
The invention relates to that class of tool holders and tools described in the
Specification of Letters Patent No. 615 of 1896 and has for its object to enable
a double ended cutter to be used which may be longer than was possible with the
tool holder described in the aforesaid specification.
By the present invention I also avoid the necessity of holding the cutter in a
straight line with the tool holder whilst tightening up the set screw or screws
by which the cutter is held and the tool holder is secured to or on the slide
rest, and I form the cutter of triangular form in cross section which requires
less grinding and is more convenient for a given size of tool.
My invention is illustrated in the accompanying drawings in which Fig. 1 is
a plan, Fig. 2 a side elevation, Fig. 3 a cross section and Fig. 1 an end view of
one form of tool and tool holder for a slide rest.
Figures 5 and 6 are central cross sections of tool holders formed in one piece
of metal, Figures 7, 8 and 9 are respectively a plan, a side elevation and an end
view of a modification and Fig. 10 is a separate view of part of the latter.
In the form of my present invention represented in Figures 1 to 4 I construct
the tool holder of two separate portions a, a¹ the one a¹ having a projecting
plate a³ at one side with bevelled edges sliding in an undercut depression a³ in
the other portion a.
The under surface of the upper portion a¹ which comes in contact with the
tool is curved from end to end and is straight or flat in cross section to fit the
upper surface of the tool b and the lower portion a of the tool holder is formed
with a correspondingly curved V groove a into which the tool beds which
latter is of triangular cross section.
In the above case the holding screw or screws will force the part a¹ down on
to the tool 6 and thus secure the latter in position.
In some cases as represented in Figs. 5 and 6 I form the holder in one piece of
metal and cut a curved shaped groove a in one side thereof to such depth that
only a thin wall of metal is left on the other side; when the tool b is inserted
in said groove and the pressure of the holding screw or screws applied the thin
wall of metal will spring and allow the groove to contract and grip the tool b
firmly.
It will be understood that it is not necessary to form the holder as represented
at Figures 1, 2, 3, 4 and 6 so that the upper or cutting face of the cutter b is in
a horizontal direction, on the contrary the grooves a' in the holder may be
formed as represented for example at Fig. 5 so that the cutting face of the cutter
is in an inclined direction when so desired.
It will be understood that as the upper and lower portions of the holders herein-
before described are only connected at the side, the cutter 6 may be considerably
longer than its holder and project from this latter at its rear.
In the modification shown at Figures 7, 8, 9, 10 I form the holder with a
curved groove a¹ in the upper face of one end thereof but instead of employing
an upper part a¹ to fit the upper surface of the tool 6 I bore a vertical hole near

page_text: the end of the tool holder which passes partially across the ✓ groove a* and in
said hole I place a dog c as shown separately at Fig. 10, said dog being screw
threaded at one end to receive a nut d and having near the other end a notch c¹ to
fit over a part of the tool b. Thus by screwing the nut d tightly up the tool
will be held securely in position in the tool holder by the dog c.
The cutter is preferably sharpened at both ends which may or may not be alike.
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
1. A metal cutting tool holder formed of two parts, the lower part of which
has a curved V shaped groove in the upper face whilst the upper part has its
underside curved and formed to fit the upper surface of the cutting tool and a
curved metal cutting tool of triangular cross section to fit the said V shaped
groove substantially as herein set forth and for the purpose stated.
2. A metal cutting tool holder consisting of a lower part formed with a
curved shaped groove in the upper face to receive the cutting tool and an
undercut recess in one of the vertical sides thereof and an upper part curved on
its under face and formed to fit the upper surface of the cutting tool and having
a descending plate on one side thereof to fit the undercut recess in the side of
tho lower part, substantially as herein set forth and for the purpose stated.
3. A metal cutting tool holder formed of two parts, the upper part having
a descending plate on one side thereof formed to fit an undercut recess in one side
of the lower part, said upper part being formed on its underside to fit the upper
side of a curved metal cutting tool of triangular cross section and said lower part
being formed on its upper surface to fit the lower side of said cutting tool sub-
stantially as set forth and for the purpose stated.
4. A metal cutting tool holder formed of a single piece of metal and having
a curved groove in one side thereof of such depth as to leave only a thin wall
connecting the upper and lower parts thereof to receive a metal cutting tool of
triangular cross section which is secured therein by means of the holding screw
or screws, substantially as herein set forth.
5. A metal cutting tool holder having a curved V shaped groove in its upper
face to receive a curved tool of triangular cross section and means for securing
said tool therein, substantially as herein set forth and for the purpose stated.
6. A curved metal cutting tool of triangular cross section, substantially as
herein set forth and for the purpose stated.
Dated this 20th dor of Dacomber 1898
HARRIS & MILLS,
23, Southampton Buildings, London, W.C., Agents.