Improvements in Reamers or other similar Boring or Cutting Tools.
Year: 1892

page_text: Date of Application, 9th July, 1892
Complete Specification Left, 5th Apr., 1893-Accepted, 8th July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Reamers or other similar Boring or Cutting Tools.
I, WILLIAM THOMAS SMITH, of George Arthur Street, Bolton-le-Moors, in the
County of Lancaster, Foreman Fitter, do hereby declare the nature of this inven-
tion to be as follows:-
,
This invention is designed with the object of providing a reamer or boring tool
with adjustable and removable cutters which can be easily set and accurately
adjusted to the desired size and which can also be readily removed and renewed as
may be required.
It consists essentially of a shank or holder formed with radial cuts or slots to
receive the cutters, movable cutters preferably tapered on the underside, a screw
with cylindrical head and taper body upon which the cutters rest and a cap or nut
or the like, which screws over the end and holds the cutters in position.
In carrying out the invention I construct the shank or holder preferably of
hardened steel of a diameter approximately the same as, or a little less than the
size to which the cutters are to be set, and at the end reduced by an eighth of an
inch more or less in diameter for a distance equal to the length of the cutters.
the end
In the end of the shank or holder are cut a number of radial slots or slits
extending to the centre, the slots being preferably placed at unequal distances
apart. The centre of the holder is bored out to receive a stud or screw,
part, which is slotted for the cutters, being bored to clear the stud except the
cylindrical head and the inner part tapped for the end of the stud to screw into.
The cutters rest upon this stud. The stud is tapered for that part of its length
upon which the cutters rest and is screwed at its end to screw into the tapped hole
in the shank or holder. The underside of the loose removable cutter is inclined,
the inclination being such as to correspond with the taper of the stud upon which
it rests.
I prefer to make the stud and cutters with one continuous incline, but they may
be made with two inclines both tapering in the same direction the stud being made
to suit, or in opposite directions, one incline might be part of the stud only and the
other incline screwed onto stud but with an opposite thread, or two loose tapers
with opposite threads could be. ed.
The extreme end of the holder turned down with a shoulder and is formed.
with a screw preferably tapered, over which a screwed cap fits. The cap may
either enclose the end of the holder, similar to an axle cap, or be made with a
central hole through which the stud can be got at without taking off the cap. The
hole in the cap and corresponding hole in the end of the shank fits accurately the
cylindrical end on the stud so as to steady and keep it in the centre of the holder.
The cap when screwed up tightens the end of the holder upon the cutters and holds
the several cutters securely in position.
The end of the holder between the cutters is preferably hollowed out to leave
room for the cuttings, but can be made with flats instead.
قيم
C 11 1000
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Reamers or other similar Boring.or Cutting
Tools..
I, WILLIAM THOMAS SMITH, of George Arthur Street,. Bolton-le-Moors, in
the County of Lancaster, Foreman Fitter, 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 :-
In reamers taps and other boring or cutting tools as at present constructed great
inconvenience and difficulty arises through the wearing down of the cutting edges.
and the inability to adjust them or to properly grind or sharpen them.
This invention is designed with the object of providing a reamer boring tool.
tap or the like with adjustable and removable cutters which can be easily set and
accurately adjusted to the desired size and which can also be readily, removed and
renewed as may be required.
It consists essentially of a shank or holder formed with radial cuts or slots to.
receive the cutters, movable cutters preferably tapered on the underside, a screwed.
stud or sleeve with cylindrical head and taper body upon which the cutters rest.
and a cap or nut or the like, which screws over the end and holds the cutters in
position.
It will be fully described with reference to the accompanying drawings.
Fig. 1. is a front elevation of reamer.
Fig. 2. is a longitudinal section.
Fig. 3. is an end elevation.
Fig. 4. is an end elevation with cap removed.
Fig. 5. is a longitudinal section similar to Fig. 2.
Fig. 6. is a sectional elevation of the end cap.
Fig. 7. is a transverse section on line -.
Fig. 8. is a sectional elevation showing modified form of screwed stud and shape
of cutter.
Fig. 9. is an elevation of the cutter removed.
Fig. 10. is an end elevation.
Fig. 11. is a longitudinal section of another. modifications with the tapered. or.
conical screwed sleeve in elevation.
Fig. 12. is a longitudinal section of same with the tapered or conical sleeve also
in section.
Fig. 13. is an elevation of cutter removed.
Fig. 14. is an end elevation.
Fig. 15. is a transverse section of same on line y-y Fig. 12.
Fig. 16. is a transverse section of same on line 2-z Fig.112.
Fig. 17. is a front elevation of tap.
Fig. 18. is a longitudinal sectional elevation of same.
Fig. 19. is an end elevation.
Fig. 20. is a transverse section.
The shank or tool holder A is constructed preferably of hardened steel of a
diameter approximately the same as, or a little less than the size to which the
cutters are to be set, and at the end reduced by an eighth of an inch more or less
in diameter for a distance equal to the length of the cutters.
In the end of the shank or holder A are cut a number of radial slots or slits a 4
extending to the centre, the slots being preferably placed at unequal_distances
apart. The centre of the holder is bored out to receive a stud or screw B, the end
part of the holder which is slotted to receive the cutters, being bored to clear the

page_text: stud except the cylindrical head band the inner part tapped for the end of the stud
to screw into. The cutters C rest upon this stud. The stud is tapered for that
part of its length upon which the cutters rest and is screwed at its end to screw
into the tapped hole in the shank or holder. The underside of the loose removable
cutter C is inclined, the inclination being such as to correspond with the taper of
the stud upon which it rests.
The extreme end of the holder A is turned down to a shoulder D and is formed
with a screw preferably tapered, over which a screwed cap E fits. The cap may
either enclose the end of the holder, similar to an axle cap, or be made with a
central hole through which the stud can be got at without taking off the cap. The
hole in the cap and corresponding hole in the end of the shank fits accurately the
cylindrical end on the stud so as to steady and keep it in the centre of the holder.
The cap E when screwed up tightens the end of the holder upon the cutters and
holds the several cutters securely in position.
The end of the holder between the cutters is preferably hollowed out to leave
room for the cuttings, but can be made with flats instead.
Referring to Figs. 2, 5 and 7, the stud B is formed with a single inclined or
tapered part b upon which the cutters C rest. By screwing the stud B into
the end of the holder A the cutters C are raised or forced outwards to the desired
extent.
Referring to Figs. 8 to 10 a modification is shown in which the stud B' is formed
with three inclined or tapered parts b' upon which the cutter C¹ rests and the under
surface of the cutter is shaped to correspond. The screwing of the stud B¹ forward
into the end of the holder raises or expands the cutters.
Referring to Figs. 11 to 16 another modification is shown in which the inclined
or tapered surfaces which raise or expand the cutters C" are formed on a sleeve F
through which the screw B₁ passes. The cones fare drilled and tapped to move
along the screw B" and a small peg f' is provided to prevent them turning with
the screw.
The screw is preferably cut with a left hand thread and is anchored or
secured at one end in the holder by the thimble G screwed thereinto in which it is
free to rotate but which prevents longitudinal movement. On the screw B₁ being
turned to the right the inclined or tapered surfaces are moved thereon and the
cutters are raised or expanded; the amount of movement which takes place is
shown on the index or vernier on the outside of the cap. One of the cones is
formed hollow at f" and the cutter C" is formed with a recess c into which the
edge of the cone fits. On the screw B₁ being turned to the left the cones are
drawn back and the cutters are drawn inwards by the hollow edge f¹¹ of the cone
which fits into the recess c.
Referring to Figs. 17 to 20 a taper tap is shown made on the same principle, and
plug or other taps can also be made in the same way. The drawing shows a tap
constructed precisely similar to the reamer shown and described with reference to
Figs. 1 to 5. The shank part is also threaded to act as a guide to the cutters.
The cutters are backed off by machinery so as to give clearance to the cutting
edge which when dull is ground upon the face.
In each instance the cap on the end when screwed tightly up secures and fastens
the cutters in the holder and when screwed back or removed slackens the cutters so
that they can be adjusted as required.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A reamer tap or other cutting tool consisting of a shank or holder formed
with radial cuts or slots to receive removable cutters, movable cutters with an
inclined surface on the underside to fit into the slots, a screwed stud or sleeve with
tapered or inclined faces upon which the cutters rest and a cap or nut which screws
over the end and secures the cutters in position substantially as described.
2. A reamer tap or other cutting tool with the several parts constructed and

page_text: arranged in combination substantially as described and shown with reference either
to Figs. 1 to 7; Figs. 8 to 10; Figs. 11 to 16 or Figs. 17 to 20.
Dated this 4th day of April 1893.
WM. P. THOMPSON & Co.,
Manchester, Liverpool and London, Patent Agents.