Improvements in Tool-holders for Slotting Machines, Planing - 1 Machines, and other Metal-working Machines.
Year: 1899

page_text: Date of Application, 22nd July, 1899
Complete Specification Left, 21st Apr., 1900-Accepted, 2nd June, 1900
PORTAL DIECIFICATION.
Improvements in Tool-holders for Slotting Machines, Planing
- 1
Machines, and other Metal-working Machines.
I, CHARLES BOWERS, of 255, Fairfield Road, Droylsden, in the County of
Lancaster, Foreman, do hereby declare the nature of this invention to be as
follows:-
My invention relates to tool-holders for slotting machines, planing machines,
lathes and other analogous machines, and has for its object to provide cheap,
efficient and convenient tool-holders, which will hold short tools made of rolled
steel bar of suitable V-shaped sections securely without permitting the springing
of such tools, and so to facilitate and simplify the preparation of tools for use in
the said machines.
According to my invention, I cast a tool-holder having a body provided with a
shank and a passage or channel of a ✓ shaped form cast therein in such position.
that adequate support shall be afforded to the tool to be inserted therein. The
said passage or channel is made to extend from one end of the tool-holder for
some distance into the shank. Through one side of the body of the tool-holder
is formed a hole with screw-threads in which is screwed a set-screw to bear upon
the tool to be held in the tool-holder. On the same side of the passage or channel
as the set-screw a ridge extending wholly or partly across the passage or channel
is formed preferably by casting. The passage or channel is slightly widened on
the side opposite to the said screw and from a place somewhat nearer the ridge
aforesaid to the orifice from which the tool is to protrude.
When a tool made of steel of a V section is inserted in the passage or channel
and the set-screw before mentioned is turned to secure the tool, the tool is first
tilted slightly so as to bear against the ridge and then very slightly deflected so
that the elasticity of the tool shall be prevented from interfering with the proper
action of such tool.
A packing or packings is or are preferably employed at the internal end of the
passage or channel when the tool to be held is not long enough to reach to the end
of the passage or channel and suitable packings may be employed to facilitate the
employment in a tool-holder constructed according to my invention of tools of
smaller section than such tool-holder is intended to ordinarily hold.
Dated this Twenty-first day of July 1899

page_text: Improvements in Tool-holders for Slotting Machines, Planing
Machines, and other Metal-working Machines.
I, CHARLES BOWERS, of 255, Fairfield Road, Droylsden, 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 relates to tool-holders for slotting machines, planing machines,
lathes and other analogous machines, and has for its object to provide cheap,
efficient and convenient tool-holders, which will hold short tools made of rolled
steel bar of suitable V-shaped sections securely without permitting the springing
of such tools and so to facilitate and simplify the preparation of tools for use in
the said machines.
According to my invention I cast a tool-holder having a body provided with a
shank and a passage or channel of a ✓ shaped form cast therein in such position
that adequate support shall be afforded to the tool to be inserted therein. The
said passage or channel is made to extend from one end of the tool-holder for
some distance into the shank. Through one side of the body of the tool-holder
is formed a hole with screw-threads in which is screwed a set-screw to bear upon
the tool to be held in the tool-holder. Or the same side of the passage or channel
as the set-screw a ridge extending wholly or partly across the passage or channel
is formed preferably by casting. The passage or channel is slightly widened on
the side opposite to the said screw and from a place somewhat nearer the ridge
aforesaid to the orifice from which the tool is to protrude.
When a tool made of steel of a V section is inserted in the passage or channel
and the set-screw before mentioned is turned to secure the tool, the tool is first
tilted slightly so as to bear against the ridge and then very slightly deflected so
that the elasticity of the tool shall be prevented from interfering with the proper
action of such tool.
A packing or packings is or are preferably employed at the internal end of the
passage or channel when the tool to be held is not long enough to reach to the end
of the passage or channel and suitable packings may be employed to facilitate the
employment in a tool-holder constructed according to my invention of tools of
smaller section than such tool-holder is intended to hold ordinarily.
In the accompanying drawing in all the figures of which the same letters of
reference are employed to indicate corresponding parts, Figs. 1, 2 and 3 show a
tool-holder made according to my invention with a tool therein, Figs. 4 and 5
illustrate how my invention may be applied in cases in which it is requisite or
convenient to employ two or more tools simultaneously as for instance in the
formation of wide slots, and Figs. 6 and 7 illustrate the method in which packings
may be employed in a tool-holder made according to my invention in order to
facilitate the use therein of tools of smaller section than such tool-holder is
intended to hold ordinarily.
The tool-holder shown in Figs. 1, 2 and 3 is shown in longitudinal section in
Fig. 1, in plan in Fig. 2. and in end elevation in Fig. 3, the tool and the screw
used to secure it in position being shown in side elevation in Fig. 1. In the
tool-holder illustrated in Figs. 1, 2 and 3 the body of the tool-holder is provided
with a shank a shown as being made cylindrical and a passage or channel b of
a V-shaped form cast therein. The slot c through the side of the shank a of the
tool-holder and in communication with the passage or channel b is provided in
order to facilitate the extraction of the core used in order to form the passage

page_text: or channel 6 in the casting of the body of the tool-holder. The shank a is formed
of such size that adequate support shall be afforded to the tool d to be inserted
into the passage or channel b. The transverse section of the passage or channel b
is made approximately the same as the transverse section of the tools which it is
intended to insert in the tool-holder and as is indicated in the accompanying
drawing the said passage or channel b is made to extend from one end of the tool-
holder for some distance into the shank a. e is the set-screw which is screwed
into screw-threads formed around a hole formed in one side of the body of the
tool-holder and is made to bear upon the tool to be held in the tool-holder. fis
the ridge formed, in this case in the casting of the body, on the same side of the
passage or channel b as the screw e and extending in this case entirely across the
passage or channel 6. The passage or channel b is slightly widened on the side
opposite to the screw and from a place g somewhat nearer the ridge f aforesaid
to the orifice from which the tool is to protrude. When a tool made of steel of
a V section is inserted in the passage or channel 6 and the set-screw e is turned
to secure the tool, the tool is first tilted slightly by the action of the set-screw e so
as to be made to bear against the ridge f and then by the further action of such
set-screw the tool is very slightly deflected so that its elasticity shall be prevented
from interfering with its proper_action.
The tool-holder illustrated in Figs. 4 and 5 is shown in plan in Fig. 4, and in
end elevation in Fig. 5. The body of the tool-holder illustrated in Figs. 4 and 5
is provided with a shank a shown as being made rectangular in section, and is
provided with two passages or channels 6 to receive tools and each provided with
a ridge f and formed like the passage or channel 6 of the tool-holder illustrated
in Figs. 1, 2 and 3, a set-screw e being provided in conjunction with each of such
channels or passages b.
Should the tool to be employed in a tool-holder made according to my invention
be too short to be capable of reaching to the inner end of the passage or channel b
in which it is to be placed when made to protrude to the extent requisite from
such tool-holder, as for instance if the tool illustrated in Figs. 1 and 2 terminated
at the part indicated by the dotted lines A, it is preferable, and in case heavy
cuts are to be made necessary, to provide a packing or packings at the internal
end of the said passage or channel b to fill up the space between the end of the
tool and the end of the said passage or channel 6 so that there may be no
possibility of the tool being forced inwards in the tool-holder while in use.
the dotted lines A in Figs. 1 and 2 be supposed to represent the end of the tool
the remaining portion of such tool d reaching to the internal end of the passage
or channel b may be assumed to represent a packing used in the manner just
described.
If
In Fig. 6 which is an end elevation and in Fig. 7 which is a longitudinal
section but shows the tool and packing in side elevation h is a packing made in
the form of a piece of metal of transverse section substantially similar to that of
the part of the passage or channel b in which it is placed and provided with a
groove approximately corresponding to the form of the tool i which is to be placed
n the tool holder but is smaller in transverse section than the tools which such
cool-holder is intended to hold ordinarily. The packing h is made of such
ength that it shall extend from the inner end of the channel or passage 6 of the
ool holder for some distance past the ridge f.
The tool-holders illustrated in the accompanying drawing are of the form
uitable for being held by means of the usual clamps or holding devices provided
pon the reciprocating heads or rams of slotting machines but it is obvious that
ool-holders made according to my invention may be provided with shanks of
ny desirable form or be provided with ears or holes or slots or any other means
receive bolts or set-screws or may be arranged to be held in any other suitable
ay in position in the slotting machines, planing machines, lathes and other
nalogous machines in which they are to be employed.
Tool-holders made according to my invention are cheap being formed almost

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entirely by casting and are efficient and convenient in use and will hold short
tools of rolled steel bar of V-shaped sections securely and without permitting such
tools to spring in use and thus the employment of tool-holders made according
to my invention simplifies the preparation of tools for use in the machines
herein before mentioned.
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:-
In a tool-holder for a slotting machine, planing machine or other analogous
metal-working machine a body provided with a passage or channel of V-shaped
form slightly widened at one end and with a ridge extending wholly or partly
across such passage or channel all for the purposes and substantially in the
manner hereinbefore described.
Dated this Twentieth day of April 1900.
HOWARD CHEETHAM,
Manchester,
Agent to the Applicant.