Improvements in Tool-holders and Tools for Slide Rests of Lathes, and for other Metal Cutting Machines.
Year: 1896

page_text: Date of Application, 9th Jan.. 1896
Complete Specification Left, 6th Oct., 1896-Accepted, 7th Nov., 1896
PROVISIONAL SPECIFICATION.
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,
Cycle Manufacturer, do hereby declare the nature of this invention to be as follows:-
The invention has for its object improvements in tool holders and tools whereby the
tool can be firmly held, easily removed for grinding and advanced from its holder
from time to time as it is reduced by grinding, whilst at the same time it is always
held with its top or cutting face at the required angle, and its cutting edge in the right
position.
I construct a tool holder for slide rests of preferably cast steel in the form of two
jaws open or divided at the front end and connected at the rear end by a spring
bow which may or may not be in one piece with the jaws.
I form the inner faces of the jaws flat and concentric with each other and in the
form of portions of two large circles, I also form the cutter to fit such jaws. By
these means the cutter can be advanced from time to time as ground away when
being sharpened, whilst by the form of the holder it is firmly held both in a vertical
and horizontal direction by the simple pressure of the set screw or screws by which
the holder is secured to or on the slide rest.
A tool for boring purposes is of the usual shape whilst the holder is formed with
its two jaws parallel to each other and grooved to receive the shank of the tool, the
said jaws being connected at their inner end by a spring bow as above described.
Dated January 9th 1896.
HARRIS & MILLS,
23 Southampton Buildings, London, W.C., Agents.
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,
Cycle Manufacturer, 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 has for its object improvements in tool holders and tools whereby
the tool can be firmly held, easily removed for grinding and advanced from its
holder from time to time as it is reduced by grinding whilst at the same time it
is always held with its top or catting face at the required angle and its cutting
edge in the right position.
I construct a tool holder for slide rests of preferably cast steel in the form of
two jaws open or divided at the front end and connected at the rear end by a
spring bow which may or may not be in one piece with the jaws.
I form the inner faces of the jaws flat and concentric with each other and in the
form of portions of two large circles, I also form the cutter to fit such jaws. By these

page_text: means the cutter can be advanced from time to time as ground away when being
sharpened whilst by the form of the holder it is firmly held both in a vertical and
horizontal direction by the simple pressure of the set screw or screws by which the
holder is secured to or on the slide rest.
A tool for boring purposes is of the usual shape whilst the holder is formed with its
two jaws parallel to each other and grooved to receive the shank of the tool, the said
jaws being connected at their inner end by a spring bow as above described.
My invention is illustrated in the accompanying drawings in which
Fig. 1 is a side view, Fig. 2 a plan or top view, Fig. 3 an end view and Fig. 4
a cross section on the line 4. 4 Fig. 1 of a slide rest tool holder suitable for a tool
for ordinary straight turning, the tool being shown in position in Figures 1 and 2
in broken lines. Fig. 5 is a side view and Fig. 6 is a plan or top view of a similar
tool holder made from a single piece of metal preferably of spring steel. Fig. 7
is a cross section of a similar holder suitable for a right hand roughing tool and
Fig. 8 is a cross section of a like tool holder suitable for a left hand roughing tool.
Fig. 9 is a side elevation and Fig. 10 a plan of a tool to be used with such bolders
suitable for ordinary straight turning.
Fig. 11 is a side elevation, Fig. 12 a plan and Fig. 13 an end view of a tool holder
for a boring tool which latter is shown by broken lines in Figures 11 and 12.
In all the figures like parts are indicated by similar letters of reference.
flat
The tool holder is made with upper and lower jaws a, b open at the front end and
connected together at the rear end by a spring bow c. In that represented at
Figures 1 and 2 the npper jaw a and the spring bow a are made in one piece of
spring steel or other metal and the latter by an extension c¹ therefrom is fixed to the
lower jaw b. In the holders shown at Figures 5 and 6 and Figures 11, 12, 13 the
jaws a, b and spring bow e are all made from a single piece of metal preferably of
spring steel. The holders shown at Figures 1 to 8 have their inner faces a
and concentric with each other and in the form of portions of two large circles;
these faces a bare as shown at Figures 3 and 4 made parallel in cross section with
the top and bottom faces of the jaws a, b when they are intended to receive an
ordinary straight turning tool d such as that shown at Figures 9 and 10 and
represented by broken lines in position within the holder at Figures 1 and 2, whilst
these faces ab are as shown at Figures 7 and 8 preferably formed inclined either
to the right or left when they are intended to receive either right or left hand
roughing tools by which means the cutting edge of such tools is brought to a horizontal
or nearly horizontal position. The tools d for these holders are made to a like curve
to that of the inner faces of the holders and their upper and lower faces are in cross
section either horizontal or inclined in one or the other direction to fit the inner faces
of the holders. With the forms of tool holders and cutters described with reference
to Figures 1 to 10 the cutters can be advanced from time to time as ground away
when being sharpened whilst by the forms of the holders they are firmly held in a
vertical and horizontal direction by the simple pressure of the set screw or screws by
which the holder is secured to or on the slide rest.
In Figures 11, 12 and 13 the tool d, shown by broken lines is of the usual
shape whilst the holder is formed with its jaws a, b parallel to each other and grooved
to receive the shank of the tool, the said jaws being connected at their inner end by a
spring bow c as described with reference to the holders shown at Figures 1 to 8.
I would have it understood that the improvements above described are not only
applicable to tools and tool holders for the slide rests of lathes but are also applicable
to tool and tool holders for other metal cutting machines.
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. A tool holder for tools employed in the slide rests of lathes and for other
metal cutting machines constructed substantially as herein shown and described
. and for the purpose stated.

page_text: 2. The combination with a tool holder of the characted herein described of a
tool shaped to fit the curved shaped jaws of the holder substantially as and for
the purpose stated.
3. A curved shaped tool for use in the slide rests of lathes and for other metal
cutting machines substantially as herein described with reference to Figures 1 to 10
and for the purpose stated.
1000
HARRIS & MILLS,
23 Southampton Buildings, W.C., Agents.