Improvements in Tool Holders for Machine Tools.
Year: 1893

page_text: Date of Application, 9th Oct., 1893
Complete Specification Left, 6th July, 1894-Accepted, 11th Aug., 1894
PROVISIONAL SPECIFICATION.
Improvements in Tool Holders for Machine Tools.
We, WILLIAM TIMMS, of 42 Hume Terrace, Yarm Road, Darlington, in the
County of Durham, Engineer, and JOHN HENRY STOREY, of 46 Hatfield Street,
Blackfriars, in the County of Surrey, Engineer, do hereby declare the nature of
this invention to be as follows:-
Our invention relates to an improved holder for machine tools, and it consists in
a device for locking the fixing bolt of the tool or cutter to the shank of the holder
to relieve the bolt of the strain put upon it through the tool or cutter at any angle
at which it may be set in the holder.
According to our invention we provide the head of the fixing bolt with teeth or
serrations all or partly around its periphery, and adapted to engage with one or more
corresponding teeth or serrations on the forward part of the shank of the holder
thereby securing it in any desired position. For convenience the forward part of
the shank of the holder may be provided with a recess into which the back of the
tool passes when the said tool is in a direct axial line with the shank, in which case
the two sides or horns form the teeth to engage with the serrated head of the bolt.
A convenient method of forming the teeth or serrations on the forward part of the
shank of the holder is to screw or rivet a plate having such teeth or serrations on
to the top of the forward part of the shank. With this construction we may
mount the said plate to slide on the top of the shank so that it can be drawn back
when it is desired to free the fixing bolt.
By this invention it will be seen that the whole of the angular strain on the
tool or cutter is taken by the serrations or teeth on the shank of the holder, thua
entirely removing all such strain from the nut on the fixing bolt which is simply
used for drawing the said bolt down and so clamp the tool or cutter.
As a modification of this device the head of the fixing bolt may be made
polysided and the sides or angles thereof may engage with the forward part of the
shank of the holder. To shift the position of the tool or cutter the nut on the end
of the bolt is slackened until the toothed or polysided part of the head of the bolt
can be lifted clear of the shank of the holder, which then permits of the tool being
turned round to the desired angle. The bolt is then drawn down by the nut until
the tool or cutter is fixed.
1002
COMPLETE SPECIFICATION.
Improvements in Tool Holders for Machine Tools.
We, WILLIAM TIMMS, of 42 Hume Terrace, Yarm Road, Darlington, in the
County of Durham, Engineer, and JOHN HENRY STOREY, of 46, Hatfield Street,
Blackfriars, in the County of Surrey, 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 :—
Our invention relates to an improved holder for machine tools, and it consists
of a device for locking the fixing bolt of the tool or cutter to the shank of the

page_text: .
holder, the object being to relieve the fixing bolt of the strain put upon it more
particularly when the tool or cutter is set at an angle with the holder.
In the accompanying drawing which illustrates some methods of carrying our
invention into practical effect :-
Figure 1 is a view in side elevation of our improved tool holder with the tool or
cutter locked to the holder.
Figure 2 is a view in side elevation-partly in section of the holder showing
the fixing bolt lifted to shift the position of the tool or cutter.
Figure 3 is a view in plan of the holder showing the tool or cutter—in dotted
lincs set at an angle with the holder.
Figures 4 and 5 are views in side elevation and plan respectively showing a
modification of our invention, and
Figures 6 and 7 are views in plan showing other forms our invention may
assume.
Throughout the views similar parts are marked with like letters of reference.
According to our invention we provide the head A of the fixing bolt A' with
teeth or serrations a, a, etc. all or partly around its periphery, and we form one or
more corresponding teeth or serrations 6 on the forward part of the shank B of the
bolder B¹ thereby securing the fixing bolt to the holder the said teeth or serrations
being adapted to interlock in any desired position. The fixing bolt A¹ is
provided with the usual hole a¹ to receive the tool or cutter X as shown and for
convenience the forward part of the shank B may be provided with a recess b¹ into
which the back of the tool X can lie when the said tool is in a direct axial line with
the shank, in which case the two sides or horns form the teeth b, b, to engage with
the serrated head A of the bolt. A convenient method of forming teeth or
serrations on the forward part of the shank of the holder is to screw or rivet a
plate such as C having such teeth or serrations at its forward end on to the top of
the forward part of the shank. With this construction we may mount the said
plate C to slide on the top of the shank as shown by Figures 4 and 5 so that it can
be drawn back when it is desired to free the fixing bolt.
By this invention it will be seen that the whole of the angular strain on the tool
or cutter is taken by the serrations or teeth on the shank of the holder, thus entirely
removing all such strain from the nut on the fixing bolt which is simply used for
drawing the said bolt down and so clamp the tool or cutter.
As a further modification the head A of the fixing bolt A' may be made
polysided and the sides or angles thereof may engage with the forward part of the
shank B of the holder B as shown by Figures 6 and 7.
To shift the position of the tool or cutter the nut A on the end of the bolt A¹
is slackened until the toothed or polysided part of the head A can be lifted clear
of the shank B of the holder or of the plate C thereon which permits of the tool
being turned round to the desired angle. The bolt is then drawn down by the nut
until the tool or cutter is fixed.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The improvements in tool holders substantially as hereinbefore described and
illustrated by the accompanying drawing.
2. In a tool holder the combination of a fixing bolt having a toothed or
serrated head, and of a holder the forward end of the shank of which has teeth or
serrations to engage with those on or in the head of the fixing bolt, as and for the
purpose set forth.
3. In a tool holder the combination of a fixing bolt having a toothed or serrated
head, and of a holder on the shank of which is mounted a sliding plate having teeth
or serrations to engage with those on or in the head of the fixing bolt, as and for
the purpose set forth.
4. In a tool holder the combination of a fixing bolt having teeth or serrations

page_text: formed round its head, and of a holder having similar teeth or serrations either
formed on or fixed to the forward part of its shank and a recess therein to receive
the end of the cutter or tool, as and for the purpose set forth.
5. The improved construction of tool holder, as hereinbefore described with
reference to Figures 1, 2, and 3 of the accompanying drawing.
6. The improved construction of tool holder, as hereinbefore described with
reference to Figures 4 and 5 of the accompanying drawing.
7. The improved construction of tool holder, as hereinbefore described with
reference to Figure 6 of the accompanying drawing.
8. The improved construction of tool holder, as hereinbefore described with
reference to Figure 7 of the accompanying drawing.
Deted this 6th day of July 1894.
ROBERT E. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicants.