Improvements in Machine Tool Holders for Holding Two Tools.
Year: 1890

page_text: Date of Application, 15th Sept., 1890
Complete Specification Left, 5th Feb., 1891-Accepted, 14th Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in Machine Tool Holders for Holding Two Tools.
THOMAS KENYON, of 120, Gluehouse Lane, Newcastle-on-Tyne, in the County
of Northumberland, Engineer, and JAMES DURANT, of 41, Peterborough Street,
Gateshead-on-Tyne, in the County of Durham, Engineer, do hereby declare the
nature of this invention to be as follows:-
The nature of this invention consists of improvements in machine tool holders for
holding two tools in such a manner as to cut or machine the work in both the
backward and forward strokes of the machine. We will explain this invention as
adapted to an ordinary planing machine.
This invention consists of a bar of suitable section and any desired material, the
said bar being fastened to the machine in the same manner as an ordinary tool; the
lower end of the bar is formed into a frame or box in which the tool holder works
and is pivotted; the frame has two flat sides with a space between them and is open
at the front and rear; in the centre of the top of the frame, and through both sides
of the frame is a hole which takes the pivot pin on which the tool holder works; at
each side of the pivot pin in the top of the frame is placed one or more holes in
which is placed spiral or other springs made of suitable strength and material, the
said springs press upon the top of the tool holder and keep it in mid travel when
the tools are clear of the work to be machined or cut.
The tool holder is made a good fit between the sides of the frame and is provided
with a hole in the top which takes the pivot pin that passes through the sides of the
frame; the part of the tool holder which is above the pivot pin is radial from the
centre of the pin and is a good fit in the top of the frame, so as to releive any strain
on the pin; at each of the front and rear corners of the tool holder is a flange ;
when the tool holder is in mid travel, each of the flanges is slightly clear of the
frame, the tool holder is also provided with a hole of suitable section up its centre
to take two tools back to back; or two holes, each hole to take one tool, the said
holes being separated by a rib, and are as near as desirable to the centre of the
holder; the advantage of having two separate holes is to be able to take out either
tool without disturbing the other; the tools are kept in place by set screws in the
front and back of the tool holder.
When the machine is set in motion the work and the tool are brought together
and the tool holder moves on its pivot untill the flanges at the front or rear (as the
case may be) of the holder stop against the ends of the frame, the tool then begins
to cut, at the same time the other tool is lifted slightly clear of the work, and
remains clear of it untill the cut is finished, the moment the tools are clear of the
work the springs bring the tool holder to the mid position again, it is then ready for
the return stroke; the tool which was lifted will now commence to cut, and the
tool which was cutting will be lifted clear of the work untill the return stroke
is finished.
Instead of having one tool holder to hold two tools, we may use a separate holder
for each tool, the holders being independent of each other, and pivoted on separate
pins; or they may be pivoted on the same pin, in the latter case the tops of the two
holders form a hinged joint, the tool holders are kept in mid travel when clear of the
work by means of springs, in the same manner as already herein explained.
We may dispense with the flanges at the front and rear corners of the tool
holder, and place a strap or belt round the bottom of the frame or box, against this
belt or strap the tool holder will stop when commenceing to cut.
The object of this invention is to cut or machine work on both backward and

page_text: forward strokes of planing, shaping, slotting, plate edgeing, and similar machines
thereby decreasing the cost of the work and considerably increasing the amount of
work done in a given time on these and similar machines.
Dated this 15th day of September 1890.
THOMAS
KENYON,
120, Gluehouse Lane, Newcastle-on-Tyne,
JAMES DURANT,
41, Peterborough Street, Gateshead-on-Tyne,
Applicants.
COMPLETE SPECIFICATION.
Improvements in Machine Tool Holders for Holding Two Tools.
We, THOMAS KENYON, of 120, Gluehouse Lane, Newcastle-on-Tyne, in the
County of Northumberland, Engineer, and JAMES DURANT, of 41, Peterborough
Street, Gateshead-on-Tyne, in the County of Durham, 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 nature of our invention consists of improvements in machine tool holders for
holding two tools in such a manner as to cut or machine work in both the backward
and forward strokes of the machine.
We will explain our invention as applied to an ordinary planing machine.
Our invention consists of a bar of suitable section and any desired material the
said bar being fastened to the machine in a similar manner to the ordinary tool;
the lower end of the said bar is formed into a frame or box in which the tool holder
or holders work and are pivotted; the frame has two flat sides with a space
between them and is open at the front and rear; in the centre of the top of the
frame, and through both sides of the frame, is a hole which takes the pivot pin on
which the tool holder or holders work; at each side of the pivot pin in the top of
the frame, is placed one or more holes in which are placed spiral or other springs
made of suitable strength and material, the said springs press upon the top of the
holder or holders and keep them in position when clear of the work ready to com-
mence the cut; the said springs can be adjusted by a small screw the end of which
presses on a metal disc, the said disc being between the screw and the spring.
The tool holder or holders are a good working fit between the sides of the frame,
and are provided with a hole in the top which takes the pivot pin that passes
through the sides of the frame; the part of the tool holder or holders which is
above the pivot pin is radial from the centre of the pin, and is a good fit in the top
of the frame, so as to releive any strain on the pin; at each of the front and rear
corners of the tool holder is a flange; when the tool holder is in mid travel, each of
the said flanges is slightly clear of the frame; the tool holder is also provided with
a hole of suitable section up its centre to take two tools back to back, or two holes
cach hole to take one tool, the said holes being separated by a rib, and are as near
as desirable to the centre of the holder; the two holes may be parallel to the
longitudinal centre line of the holder, or at any suitable angle to the said centre
line, in the latter case the holes pass right through the holder, and therefore allow a
longer tool to be used; a hole may also be placed in the top of the frame or box on
each side of the pivot pin, the said holes being at the same angle as and in line
with the holes in the tool holder, but are slightly larger, this allows a still longer
tool to be used; the advantage of having two separate holes is to be able to take
out either tool without disturbing the other. The tools are kept in place by set
screws in the front and rear of the tool holder. The sides of the frame or box are
kept from opening by a plate across the bottom fixed to each side.
When the machine is set in motion the work and the tool are brought together,
and the tool holder moves on the pivot pin untill the flanges at the front or rear as

page_text: 1g 10. I 4 մե ԵՂԵ
OL COOL Holder A.
Fig. 19. is a side elevation of tool holder K*.
Fig. 20. is a plan of top of Fig. 18.
Fig. 21. is a plan of top of Fig. 19.
Refering to Sheets 1, 2 and 3.
The bar A made of any desired material, is fastened to the machine in a similar
manner to the ordinary tool, the lower end of the bar A is formed into a frame or
box L in which the tool holder K, or tool holders K' and K2 (Sheet 3,) work and
are pivotted, the frame has two flat sides M with a space between them, and is open
at the front and rear as shown in Fig. 5, in the centre of the top of the frame L,
and through both sides M of the frame, is a hole N which takes the pivot pin D on
which the tool holder K or holders K' and K2 Sheets 1, 2 and 3 work and are
pivotted.
On each side of the pivot pin D, in the top of the frame L, is placed one or more
holes P, in which is placed spiral springs Qmade of suitable strength and material;
the springs Qpress upon the top of the tool holder K, or holders K' and K²,
Sheets 1, 2 and 3, and keep them in position when clear of the work, ready to
commence the cut, the springs Q can be adjusted to exert different pressures by
turning the screws F, the end of the screw F presses upon a metal disc a' which is
between the screw F and the spring Q.
The tool holder K, or holders K and K2, Sheets 1, 2 and 3, are a good working
fit between the sides M of the frame L, and are provided with a hole N¹ in the top,
which takes the pivot pin D, the pivot pin D also passes through holes N, in
the sides M of the frame L, the part of the tool holder K, and holders K¹
and K2, Sheets 1, 2 and 3, is radial from the centre of the pin D, and is a good
working fit in the top of the frame L; at each of the front and rear corners of the
tool holder K is a flange M'; the tool holder K Sheets 1 and 2 is also provided
with two holes 61, each hole to take one tool a, or b, the holes b¹ are separated by a
rib h, Figs. 6, 7 and 8, the tools a and b are kept in place by set screws E in the
front and rear of the tool holder K; the keep V is to prevent the sides M from
opening when side pressure is on the tools.
When the machine is set in motion, the work T and one of the tools b are brought
together, and the tool holder K moves on its pivot D untill two of the flanges M¹
on the same side of the holder K as the tool b, stop against the ends of the frame L,
Fig. 1; the tool b, then begins to cut, the tool a has been lifted slightly clear of the
work T and remains clear untill the cut is finished, the moment the tools a, and b,
are clear of the work T, the springs Q bring the tool holder K to the mid position
again, it is then ready for the return stroke, in the return stroke the tool a,
will cut and the tool b, will be lifted clear of the work untill the return stroke is
finished.
Refering to Sheet 3.
Two separate tool holders K¹ and K2 are shown, each holder being provided with
a hole to take one tool, the holes 62 are shown parallel to the longitudinal centre
line of the holder; the holes N¹ in the top of the holders K' and K2 are for the
pivot pin D to pass through, the tops a of the two holders K' and K² form a hinged
joint, the pivot pin D also passes through holes N in the sides M of the frame or
box L; the tools a³ and 63 are kept in the cutting position by springs Q pressing on.
top of the tool holders K' and K2, the flanges M2 which are on the outer corners
only of the holders K' and K2, are pressed against the sides M of the frame or box L
when the tools are cutting; whilst one of the tools 63 is cutting the other tool a³
drags on the work; each of the holders has a lift equal to the space C between the
top of the frame L and the top of the holders K¹ and K2, in the return stroke
the tool a³ will cut, and the tool 63 will drag on the work T; the tools are kept in
place by the set screws E; the pressure on the springs Q is adjusted by the set
screws F the keep V is to prevent the sides M of the frame or box L from
opening when side pressure is on the tools.

page_text: Refering to Sheet 4.
Two separate tool holders K³ and K are shown, each holder being provided with
a hole to take one tool; the holes are shown at a suitable angle to the longi-
tudinal centre line of the holder so as to allow a longer tool to be used; the holes c¹
in the top of the frame L' are in line with holes 4 but are slightly larger to allow
the tool to pass through them, and allow it to move back when it lifts as it drags
over the work; the tops of the two tool holders K³ and K' form a hinged joint;
the pivot pin D passes through holes N in the sides M of the frame or box L³, and
holes N' in the top of the tool holders K³ and K'; the tools a³ and b³ are kept in
the cutting position by springs Q pressing on top of the tool holders K³ and K*;
the flanges M2 which are on the outer corners only of the holders K³ and K*, are
pressed against the sides M of the frame or box L' when the tools are cutting;
whilst one of the tools 63 is cutting, the other tool a³ drags on the work T; each of
the holders K3 and K has a lift equal to the space C between the top of the
frame L' and the holders K³ and K', in the return stroke the tool a³ will cut and the
tool will drag on the work T; the tools are kept in place by the set screws E;
the pressure on the springs Q is adjusted by the set screws F; the keep V is to
prevent the sides M of the frame or box L' from opening when side pressure is on
the tools.
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 :-
First. The improvements in machine tool holders for holding two tools in which
the tool holder having a hole up its centre to take two tools back to back or two
separate holes each hole to take one tool, the said tool holder having a hole in the
top, through which passes the pivot pin on which it works, in combination with the
frame or box at the end of the bar which is fastened to the machine, substantially
as and for the purpose herein set forth and illustrated.
Second. The improvements in machine tool holders in which two separate holders
are used each holder having a hole to take one tool, the tops of the two tool holders
form a hinged joint and have a hole in them through which passes the pivot pin on
which they work, in combination with the frame or box at the end of the bar which
is fastened to the machine substantially as and for the purpose herein set forth and
illustrated.
Dated this 3rd day of February 1901,
THOMAS KENYON,
120, Gluehouse Lane, Newcastle-on-Tyne,
JAMES DURANT,
41, Peterborough Street, Gateshead-on-Tyne,
Applicants.