Improvements in Tool Holders for use in Lathes and Planing Machines and other Machine Tools.
Year: 1898

page_text: Date of Application, 8th June, 1898
Complete Specification Left, 8th Mar., 1899 Accepted, 29th Apr., 1899
$
Improvements in Tool Holders for use in Lathes and Planing
Machines and other Machine Tools.
I, CHARLES BOWERS, of 255, Fanfield Road, Droylsden, in the County of
Lancaster, Foreman, do hereby declare the nature of this invention to be as
follows -
My invention consists in improvements in tool holders for use in lathes and
planing machines and other machine tools and the object of my invention 18 to
provide tool holders which while being simple and efficient and adapted to hold
tools so curved as to be capable of being sharpened by being ground on one face
only, shall be capable at different times of holding different kinds of tools
According to one form of my invention, I cast or otherwise form a boss pio-
vided with a shank and with a slot, which slot 18 made with one side of a cui ved
form and the opposite side in the form of a plane or flat surface A hole 18
made in the boss communicating with the interior of the slot and preferably
through one of the sides aforesaid, and provided with a screw-thread or screw-
threads to receive a set screw or screwed stud In conjunction with the slot
above described, I provide a key or filling piece, which is made in the form of
a segment of a cucle with a flat back. When using a tool holder constructed
according to my invention to hold a curved tool for instance a tool forming a
segment of a ring, I insert the filling piece in the slot so that the plane side
may be against the plane side of the slot I then insert between the curved
side of the filling piece and the curved side of the slot the curved tool, and
after such tool has been adjusted to the required position, I secure it in its
place by the set screw oi stud aforesaid When using a tool holder constructed
according to my invention to hold a straight tool, I place the filling piece above
mentioned in the slot of the holder so that the curved side may be against the
curved side of the slot and insert the tool between the straight side of the slot
and the straight side of the key or filling piece, and after the tool has been
adjusted into the requned position, I secure it in its place by means of the set
screw or stud aforesaid The wedge or filling piece should preferably be made
of the same section as the tools to be placed in the slot with which it is used.
It is obvious that instead of only one key or filling piece being employed, two
may be used, but in that case it will be .necessary that the slot should have two
curved sides instead of one
A tool holder made according to my invention may be provided with two slots
instead of with only one in the manner herein before described. In one form of
holder formed with two slots one slot is formed so as to intersect or cross the
other at an inclination or angle, and the slots may be so made that only one
set screw or stud is necessary to bind a tool in its place whether placed in one
slot on the other or two or more separate holes may be provided The object of
so forming the second slot is that if it be requisite or desirable at any time
the tool may be placed in a better position for use for the purpose of turning
up the flanges.

page_text: In the formation of a holder to be used with tools of a V-shaped or other
similar section the slot in such tool holder is preferably made of a section
corresponding to that of the tool to be placed theiem or in the use with a tool
of any section in a slot of differing form a filling piece or filling pieces may be
provided to prevent the tool from being moved in such slot while in use.
In some cases, it may be desirable that the key or filling piece, while having
a certain amount of movement, should be so secured in the slot of the tool holder,
that it may not fall out when the tool is withdrawn from the tool holder This
object is effected by means of a small screw oi stud secured in the tool holder
or the filling piece or key and projecting into a small slot or hole formed in
the filling piece or key or tool holder
Doted this Saventh day of June 1808
HOWARD CHEETHAM,
Manchester Agent to the Applicant.
Improvements in Tool Holders for use in Lathes and Planing
Machines and other Machine Tools.
I, CHARLES BOWERS, of 255, Fairfield Road, Dioylsden, in the County of
Lancaster, Foreman, 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 in improvements in tool-holders for use in lathes and
planing machines and other machine-tools and the object of my invention is to
provide tool-holders which while being simple and efficient and adapted to hold
tools so curved as to be capable of being sharpened by being ground on one face
only, shall be capable at different times of holding different kinds of tools
According to one form of my invention. I cast or otherwise form a boss pro-
vided with a shank and with a slot, which slot is made with one side of a cuived
form and the opposite side in the form of a plane or flat surface
A hole 18
made in the boss communicating with the interior of the slot and preferably
through one of the sides aforesaid, and provided with a screw-thread or screw-
threads to receive a set sciew or screwed stud In conjunction with the slot
above described, 1 provide a key or filling piece, which is made in the form of
a segment of a cucle with a flat back When using a tool-holder constructed
according to my invention to hold a curved tool for instance a tool forming a
segment of a ing, I insert the filling piece in the slot so that the plane side
may be against the plane side of the slot 1 then insert between the curved
side of the filling piece and the curved side of the slot the curved tool, and
after such tool has been adjusted to the required position, I secure it in its
place by the set-screw or stud aforesaid When using a tool-holder constructed
according to my invention to hold a straight tool, I place the filling piece above
mentioned in the slot of the holder so that the curved side may be against the
curved side of the slot and insert the tool between the straight side of the slot
and the straight side of the key or filling piece, and after the tool has been
adjusted into the required position, I secure it in its place by means of the set-
8Crew or stud aforesaid The wedge or filling piece should preferably be made
of the same section as the tools to be placed in the slot with which it 18 used.
A tool-holder made according to my invention may be provided with two slots
instead of with only one in the manner herein before described In one form of

page_text: holder formed with two slots one slot is formed so as to intersect or cross the
other at an inclination or angle, and the slots may be so made that only one
set-screw or stud 19 necessary to bind a tool in its place whether placed in one
alot of the other or two or more separate holes may be provided. The object of
so forming the second slot is that if it be requisite or desirable at any time
the tool may be placed in a better position for use for such purposes as tuining
up flanges
In the formation of a holder to be used with tools of a V-shaped or other
similar section the slot in such tool-holder is preferably made of a section
corresponding to that of the tool to be placed therein or in the use with a tool
of any section in a slot of differing form a filling piece or filling pieces may be
provided to prevent the tool from being moved in such slot while in use
In some casos, it may be desirable that the key or filling piece, while having
a certain amount of movement, shall be so secured in the slot of the tool-holder,
that it may not fall out when the tool is withdrawn from the tool-holder This
object is effected by means of a small sciew or stud secured in the tool-holder
or the filling piece on key and projecting into a small slot or hole formed in
the filling piece or key or tool holder
In Figs 1 to 17 of the accompanying drawings throughout all the figures of
which the same letters of reference are employed to indicate corresponding parts,
several forms of tool-holder constructed according to my invention are shown
by way of illustration of some of the modes of carving my invention into effect
Fig 1 is a plan and Fig 2 a longitudinal section taken on the plane indicated
by the line 22 of Fig. 1 of one form of tool-holder intended for use in a capstan-
lathe on tuet-lathe, with a curved tool inserted, the shank being shown broken
for convenience of illustration, and Fig 1s a real elevation of the body of
such tool-holder without the tool and filling piece used therewith
Fig is a plan and Fig 5 a longitudinal section taken on the plane indicated
by the line 5 5 of Fig. of another form of tool-holder intended for use in a
capstan-lathe or turret-lathe with a curved tool inserted, the shank of the tool-
holder being shown broken for convenience of illustration and Fig 6 18 a front
elevation of the body of such tool-holder without the tool and filling piece used
therewith
Fig 7 is a rear elevation, Fig 8 a plan and Fig 9 a side elevation in part a
longitudinal section taken on the plane indicated by the line 99 of Figs. 7 and 8
of another form of tool-holder intended for use in a capstan-lathe or turi et-lathe
Fig 10 is a front elevation, Fig 11 a plan and Fig 12 a longitudinal section
taken on the plane indicated by the line 12 12 of Fig 10 and 11 of one form
of tool-holder intended for use with a slide-rest or lathe-tool-holder of ordinary
form.
Fig 13 is a plan and Fig 14 a section taken on the plane indicated by the
line 14 14 of Fig 13 illustrating another form of tool-holder intended for use
with a lathe-slide-rest o lathe-tool-holder or ordinary construction
Fig 15 is a font elevation, Fig 16 a plan and Fig 17 a longitudinal section
taken on the plane indicated by the line 17 17 of Figs 15 and 16 of one form
of tool-holder intended for use with a planing-machine-tool-holder of ordinary
form
In each of the tool-bolders illustrated in the accompanying drawings a 18
the boss and 6 the shank and the slot which is made with one side c¹
of a cui ved form and the opposite side of a plane or flat form and d is
the screw inserted in the hole formed in the boss a and communicating
with the said alot c, and e 18 the filling piece which 1s provided for
use with the tool to be placed in the slot and is made approxi-
mately in the form of a segment of a circle with a flat back, so that it is pro-
vided with a curved face e of a curvature corresponding to that of the inner
curved surface of the curved tool with which it is to be used and with a flat
face which may be placed against the flat boundary of the slot e
The

page_text: ourved side c¹ of the slot e is made of a curvature similar or approximately
similar to that of the surface el of the filling piece e so that when placed
against the curved side el of the slot the filling piece a may rest against it
without being liable to oscillate thereon and for this purpose I prefer that the
✓ radius of the curvature of the side of the slot shall be less than
the radius of the curvature of the surface of the filling piece e
In some
cases instead of the surface c¹ being continuous from end to end it may be
divided into two or more parts separated by hollows
Each of the tools illustrated in Figs. 1 to 17 18 shown as aanged for use
with a curved tool, the filling piece being placed with its flat surface in
contact with the flat side of the slot in which the tool is placed so that
the curved surface el of the filling piece is made to bear on the inner curved
surface of the tool but in Figs. 2, 5, 12 and 14 dotted lines A indicate the
position in which straight tools may be used When a straight tool is used in
a tool-holder made according to my invention the filling piece & used with
such tool 18 placed in the slot c of such tool-holder with its curved surface e¹
against the curved boundary ¹ of the slot so that its plane surface e³ forms
a bed for the tool to bear upon The screw d provided in each of the tool-
holders illustrated in the accompanying drawings may be used to secure In
position the tool placed in such tool-holder whether such tool be curved or
straight
The slota c provided in tool-holders according to my invention may be formed
in any suitable way, but I prefer to form them by the use of coies in casting
the bodies of such tool-holders, and I prefer to cast the bodies of such tool-
holders of steel or malleable on
The tool-holders illustrated in Figs 1 to 9 inclusive being intended for use
in capstan-lathes or turret-lathes are provided with round shanks while those
illustrated in Figs 10 to 14 being intended for use with slide-rests or lathe-
tool-holders of ordinary construction and that illustrated in Figs 15, 16 and 17
being intended for use with a planing machine are provided with square or
rectangular shanks
The tool shown in Figs 1, 2 and 3 16 arranged at one side of the shank b of
the tool-holder while that shown in Figs 4, 5 and 6 18 arranged in the same line
as the shank b of the tool-holder, the shank b being formed with a slot b¹ to
allow the rear end of the tool to pass into or through such shank b.
The tool illustrated in Figs 7, 8 and 9 18 arranged at one side of the shank b
of the tool-holder and the body of the tool-holder is formed with a projecting
boss in which is screwed a set-screw which may be made to bear upon the
rear end of the tool so as to adjust such tool in position and hold it against
displacement in the tool-holder
Each of the tool-holders illustrated in Figs 10, 11, 12, 13 and 14 18 formed
with two slots intersecting each other so that the curved tool or straight tool
used with such tool-holder may be mounted in such tool-holder in either of two
positions as may be convenient from time to time according to the work required
to be performed
The tool-holder illustrated in Figs 15, 16 and 17 is so formed that the tool
shall be in line with the shank which is formed with a slot to allow the
tool to enter the shank and the curvature of the curved boundary c¹ of the
alot c and the thickness of the shank are so proportioned that the tool shall
not project from the faces of the shank b although such tool is of such length
as to allow of being sharpened a considerable number of times before becoming
too short for further use By so arranging that the tool shall not project from
the shank b I enable the shank of the tool-holder to be held by the tool-holder
of a planing machine close to the boss a in which the slot is formed so that
the tool shall be held with the rigidity requisite for efficient planing.
From the illustrations which have given in the accompanying drawings,
it is obvious that tool-holders may be made according to my invention in a

page_text: variety of forms according to the purposes for which they may be intended
Tool-holders made according to my invention may be formed with slots to receive
tools of any section which may be considered desuable in the formation of
such tool In Figs. 18 and 19 there are shown some sections of steel which
may be conveniently bent into curved tools which only need grinding on the
ends when requiring to be resharpened The sections illustrated in Fig 18
illustrate some of those which may be used in the formation of tools which may
be used in the tool-holders made according to my invention for use in capstan-
lathes or turret-lathes, and the sections illustrated in Fig 19 illustrate two of
the forms of steel which may be employed in the formation of tools to be used
in tool-holders made according to my invention for use in ordinary turning
lathes or planing machines.
Although it is preferable that the steel employed to form the tools to be used
in the tool-holders constructed according to my invention shall be of a section
corresponding to the form of the slots in which such tools are to be placed it
18 obvious that tools of one section may often be placed in slots primanly
intended to receive tools of another section In any case in which it may be
often intended to place in a slot of one section a tool of another section, which
will be specially liable to be displaced if simply placed therein, as for instance
a curved tool of circular transverse section placed in a slot of any of the forms
illustrated in the accompanying drawings, I provide a second filling piece
adapted to be placed in such slot c and provided with a curved face to bear
against the surface c¹ and on the opposite side a hollow bed or channel of an
angular or other suitable form corresponding to the outer surface of the curved
part of the tool so that such tool may be securely held
The dotted lines B in Figs 7 and 8 indicate one way in which a screw may
be inserted in a tool-holder made according to my invention and made to enter
the filling piece e used in such tool-holder and prevent such filling piece e from
being accidentally allowed to escape therefiom
The tool-holders constructed according to my invention are simple and cheap
to construct as it is possible to form the slots therein by casting and are officient
and facilitate the use of tools curved so as to be sharpened by being ground on
one face only and also are capable of being used at different times with different
Linds of tools.
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. In a tool-holder for a lathe or planing machine or other machine-tool, the
combination of a boss provided with a slot which is made with one side of a
curved form and the opposite side in the form of a plane or flat surface and a
filling piece with a curved face and a flat back for the purposes and substantially
in the manner hereinbefore described.
2 In a tool-holder for a lathe or planing machine or other machine-tool,
the combination of a boss provided with slots each of which is made with one
side of a curved form and the opposite side in the form of a plane or flat surface
and a filling piece with a curved face and a flat back employed for the purposes
and substantially in the manner herein before described
Dated this Seventh day of March 1800
HOWARD CHEETHAM,
Manchester, Agent to the Applicant