Improvements in Boring and Outting Tools, and Holders therefor.
Year: 1895

page_text: Date of Application. 4th Mar., 1895
Complete Specification Left, 4th Dec., 1895-Accepted, 18th Jan., 1896
PROVISIONAL SPECIFICATION.
Improvements in Boring and Outting Tools, and Holders therefor.
I, WILLIAM THOMAS SMITH, of George Arthur Street, Bolton-le-Moors, in
County of Lancaster, Engineer, do hereby declare the nature of this invention to
be as follows:-
The invention relates to that class of tools or outters which are carried in
holders in machine tools and this invention is designed to provide for the more
ready and accurate adjustment of such tools for the work which they have to
perform.
As applied to a lathe boring bar the tool or cutter holder is split at the end or
formed in two parts bolted screwed or clamped together. A slot is cut through
the holder or bar in which are placed two cutters sliding upon one another the
cutting edge of one projecting at one side of the holder and the cutting edge of
the other cutter at the opposite side of the holder. A screw is placed in the slot
alongside of the cutters one end of which is chased with right hand thread and the
other with a left hand thread. The edges of the cutters are made somewhat
concave and provided with screw threads corresponding with those on the screw
with which they engage. By rotating the screw the cutters are set or adjusted to
any position and they are then held in position by being tightly clamped or gripped
between the split ends of the holder. The clamping screw and the adjusting
screw are preferably made with hollow heads and a key of suitable shape to fit
same is provided.
As applied to lathe cutting tools the holder is made to hold a various number of
tools preferably four and is carried on a horizonal pivot and rotates thereon in a
vertical plane. The tools are clamped in position as before described by screws
with hollow heads. The holder is capable of rotating on a pin in one direction but
is prevented rotating in the opposite direction by a steel catch plate inserted in the
head and a steel catch in the bar which is held in position by a spiral or other
spring.
•
As applied to slotting machine cutters or tools the tool is set in the tool box or
holder so that the face of the tool recedes from or ceases to press upon the face of
the cut during the upward stroke. The tool is clamped into the box or holder by
set screws and the box is connected or attached at one end to the ram of the
machine by a pivot on which it can oscillate within a limited distance and at the
other end by coiled or other springs. The position of the pivot is somewhat
eccentric or to one side of the longitudinal axis of the tool or cutter so that as
the holder moves upon this pivot the cutting face of the tool is either drawn away
from the face of the slot or if moved in the reverse direction is brought into
position to begin a fresh cut. When in this latter position the back of the tool
holder lies against the ram. The relief movement is caused by the drag of the
tool on the return or up stroke up the face of the work. In another modification
of this holder it is held in normal position by a spring holding it up against an
inclined plane. The top edge of the holder and the bottom face of the ram against
which the holder rests are provided each with an inclined plane preferably faced
with steel plates the two inclined surfaces being held in contact by the spring.
Any downward movement of the holder causes it to move outwards at the top and
carries the tool-face backwards while an upward movement draws the top part
back into normal position for cutting. The tool box or holder is drawn downwariłs

page_text: by the drag of the tool up the face of the work on the up stroke and then lifts-
back into its place again ready for the down stroke. A screw is provided for
adjusting the tension of the spring.
Dated this 26th day of February 1895.
W. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
"
.
COMPLETE SPECIFICATION.
Improvements in Boring and Outting Tools, and Holders therefor.
I, WILLIAM THOMAS SMITH, of George Arthur Street, Bolton-le-Moors, in
the County of Lancaster, 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 invention relates to that class of tools or cutters which are carried in holders
in machine tools and this invention is designed to provide for the more ready
and accurate adjustment of such tools for the work which they have to perform.
It will be fully described with reference to the accompanying drawings in
which the invention is shown as applied to various tools.
Fig. 1. Side elevation of boring tool or bar.
Fig. 2. Plan partly broken away and in section.
Fig. 3. End elevation.
Fig. 4. Transverse section.
Fig. 5. Perspective view.
Fig. 6. Front elevation of lathe outting tool.
Fig. 7. Sectional elevation of same.
Fig. 8. Plan partly in section.
Fig. 9. Transverse section on line a―e.
Fig. 10. Transverse section on line y—y.
Fig. 11. Side elevation of slotting machine tool.
Fig. 12. Plan of same partly in section.
Fig. 13. Front elevation of slotting machine tool (modified form).
Fig. 14. Front elevation in section.
Fig. 15. Side elevation in section.
Fig. 16. Plan.
In Figs. 1 to 5 the invention is shown as applied to a lathe boring tool or bar.
The tool or cutter holder A is split at the end or formed in two parts a clamped
together by a screw a¹ or by other means. A slot b is cut through the holder
or bar A in which are placed two cutters B, B₁ sliding upon one another the
cutting edge of one projecting at one side of the holder and the cutting edge
of the other cutter at the opposite side of the holder. A scrow C is placed in
the slot alongside of the cutters one end of which is chased with right hand
thread and the other with a left hand thread. The edges of the cutters B, B₁
are made somewhat concave and provided with screw threads 6' corresponding
with those on the screw C with which they engage. By rotating the screw
the cutters B B¹ are set or adjusted to any position and they are then held in
position by being tightly clamped or gripped between the split ends a of the
holder A by the clamping screw a. The clamping screw a¹ and the adjusting
screw Care preferably made with hollow beads and a key of suitable shape to
fit same is provided. The split end may be lengthened if required.
In Figs. 6 to 10 the invention is shown as applied to lathe outting tools.
The cutter holder A is made to hold a number of tools B preferably four and
is carried on a horizontal pivot D and rotates thereon in a vertical plane. The
tools B are clamped in position by screws a preferably with hollow heads. In

page_text: slots or recesses e on the inner side of the holder A are placed catch plates E.
preferably of semi-circular shape and made of steel. These plates engage with
a spring catch or latch F fitted in a recess of the fixed bar A. The holder A is.
capable of rotating on the pin D in one direction but is prevented rotating in the
opposite direction by one of the steel catch plates E inserted in the rotating
holder A engaging with the steel catch F in the bar A which is held in position.
by the spiral spring G. The face of the catch F is inclined at fto allow the
movement of the catch plates E over it in one direction while the face or shoulder".
against which the edge of the plate E comes in contact prevents any movement in-
the opposite direction.
In Figs. 11 and 12 the invention is shown as applied to slotting machine cutters.
or tools. The tool or cutter B is set in the tool box or holder A so that the face
of the tool recedes from or ceases to press upon the face of the cut during the
upward stroke. The tool or cutter B is clamped into the box or holder A by set.
screws a' and the box or holder A is connected or attached at one end to the ram H
of the machine by a pivot or pin D on which it can oscillate within a limited
distance and at the other end by coiled or other springs G. The position of the
pivot D is somewhat eccentric or to one side of the longitudinal axis of the tool or
cutter B so that as the holder A moves upon this pivot the cutting face of the tool
is either drawn away from the face of the slot which is being cut or if moved in.
the reverse direction is brought into position to begin a fresh cut. When in this
latter position the back of the tool holder A lies against the ram. The relief
movement is caused by the drag of the tool on the return or up stroke up the face-
of the work.
In Figs. 13 to 16 a modification of the holder as applied to slotting machines is.
described. The holder A. in which the cutter B is clamped by the screws a' is held
in normal position by the spring G acting vertically which holds it up against the
inclined face or plane a". It is pivoted at or near the bottom on the pin D passing
into a hole or slot d which is sufficiently long to allow the holder to drop or fall as..
it swings backwards. The top edge a of the holder A and the bottom face a" of
the ram H against which the holder A rests are provided each with an inclined.
plane preferably faced with steel plates the two inclined surfaces being held in.
contact by the spring G. Any downward movement of the holder A causes it to
move outwards at the top and swivelling upon the pin D carries the tool face B.
backwards while an upward movement draws the top part back into normal position
for cutting. The tool box or holder A is drawn downwards by the drag of the
tool B up the face of the work on the up stroke and then lifts back into its place.
again by the spring G ready for the down stroke. A screw g is provided for
adjusting the tension of the spring G..
Having now particularly described and ascertained the nature of the said iuven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A boring bar constructed with a split or divided end, two cutters placed in a
slot cut therein, each cutter having a screw thread chased on one edge, an adjusting
screw with right and left hand threads which engage with the threads on the edges.
of the cutters and a clamping screw for securing the cutters when set or adjusted
substantially as described.
2. A tool holder for lathes constructed with a rotating head mounted upon a pin
or stud and capable of rotation thereon, a spring catch placed in the stationary bar
and catch plates fitted into recesses in the back of the rotating head whereby it is.
allowed to rotate in one direction only and prevented rotating in the reverse
direction substantially as described.
3. A tool box or holder for slotting machines constructed in two parts one bolted
to the ram of the machine and the other attached thereto eccentrically by a pin or
pivot at the bottom and spiral springs at the top substantially as and for the.
purpose described and shown.

page_text: 4. A tool box or holder for slotting machines constructed with a holder A
pivoted to a fixed part or ram provided at its upper edge with an inclined plane or
surface and held in position by a spring so that when the holder is drawn down it
is caused to move outwards at the top and in the reverse direction at the bottom to
clear the face of the work and when free resumes its normal position for the next
cut substantially as described.
5. A holder for boring or cutting tools having the several parts constructed and
arranged in combination substantially as described and shown with reference either
to Figa. 1 to 5, Figs. 6 to 10, Figs. 11 to 12, or Figs. 13 to 16 of the drawings.
Dated this 29th day of November 1895.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.