An Improved Turret Lathe Tool Holder.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
An Improved Turret Lathe Tool Holder.
DAVID FLEMING, Engineer, Alton Street, Ross, Herefordshire, do hereby
declare the nature of this invention to be as follows:-
A metal bar has a flange formed at one end of it and a hole running through
it. Two or more loose Hanges with holes through center of them are placed
The first
next to first flange and are all clamped together by a bolt and nut.
mentioned flange and the one next to it act as a friction clutch, and the inside
surfaces of these may be grooved or corrugated. A spring is placed between
them to keep them apart when the nut is slackened. The tools are placed between
each of the second and third and other flanges and project radially from the cir-
cumferences of these, which are slightly recessed in each face to fit them. The
bar part of the holder is fixed in lathe same as an ordinary bar tool. When the
nut is slackened the loose flanges with tools projecting from them are free to
rotate together and the tool required can then be adjusted to the correct posi-
tion and on the nut being screwed up becomes fixed ready to operate on the work.
Dated this 23rd day of November 1899.
I, DAVID FLEMING, residing at Alton Street, Ross, in the County of Hereford-
shire, 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:-
A metal bar of forged or cast steel or other suitable material A Figs. 1, 2, 3,
5 and 6 on drawing preferably of square section has a flange B formed at one
end of it and a hole running partially or wholly through it, which hole may
be through center of bar A or on one side of center as at P Fig. 2.
Two or more loose discs or flanges C D and E which have holes through
center of them are placed next to flange B and can be all clamped together
by a screwed pin F and nut G.
At Fig. 5 the screwed pin F is in the form of a stud and is screwed into the
flanged end of the bar A; the other portion of which is left solid and similar
in length to that at Figs. 1 and 3.
At Fig. 6 the bar A is round in section and being shortened in length and
screwed at the opposite end to the flanged end, takes the place of the screwed

page_text: pin F, while the central hole can be occupied with an ordinary boring bar H
and the tool holder used as a boring head to do boring work.
The flanges B and C act as a friction clutch and the inside surfaces of these
at I may be grooved or corrugated; such grooves or corrugations are preferably
of shape arranged concentrically as shown at I; the threads on B fitting
exactly into the grooves in C.
The tools or butters at K are preferably of the section shown at K¹ Fig. 3,
and are placed between the flanges C and D, D and E or C and E: preferably
not more than 3 cutters being placed between any two flanges. The cutters
project radially from the flanges as shown at Fig. 4 being placed into slots cut
on the faces of the flanges shown by dotted lines at L; the slots being shaped
to suit the section of cutters.
A spring, preferably a spiral one encompassing the pin F and fitting into a
recess cut into the flanges B and C is placed between these flanges at J to keep
the other flanges slightly pressed together when the nut G is slackened and
prevent the cutters from falling out. The set screw M prevents the pin F
from turning when nut G is screwing up.
In order to operate the tool holder as shown at Figs. 1, 2, 3, 4, 5, the bar A is
fixed in lathe same as an ordinary bar tool would be. The tool holder as shown
at Fig. 6 would be keyed on to the bar H and fixed between the lathe centers.
When the nut G is slackened, the cutters can be inserted, removed or adjusted
and the loose flanges with cutters attached can be all rotated together till any
required cutter is brought into the correct position to cut. Only one cutter
can be used at a time for turning and surfacing work but 3 cutters can be used
together for boring work.
my said
Having now particularly described and ascertained the nature of
invention and in what manner the same is to be performed I declare that what
I claim is
(1) A turret lathe tool holder consisting of a flanged bar and loose discs
or flanges placed together in a vertical position, between which flanges tools or
cutters can be placed and clamped together by screw and nut, constructed and
used substantially as hereintobefore described.
(2) A turret lathe tool holder with friction clutch arrangement substantially
as hereintobefore described.
(3) A turret lathe tool holder with spring substantially as hereintobefore
described.
Dated this 22nd day of August 1900.
DAVID FLEMING.