An Improved Tool-holder for Lathes and other Machine Tools.
Year: 1890

page_text: Date of Application, 17th Oct., 1890
Complete Specification Left. 8th Dec., 1890--Accepted, 10th Jan., 1891
PROVISIONAL
SPECIFICATION.
An Improved Tool-holder for Lathes and other Machine Tools.
1 HENRY BOSWELL LEE of 11 Pratt Street Camden Town N.W. Engineer do
hereby declare the nature of this invention to be as follows:-
This invention relates to an improved construction of tool holder, adapted to clasp
and retain the cutting tool of a lathe, planer, or similar machine. The holder when
constructed, consists of a bar or tube of steel, iron, or other suitable material of square or
circular section, and having formed in it, a longitudinal hole, which extends nearly
its whole length: one end however being left solid; through this solid end of the
holder and passing through the end of the longitudinal hole, are cut holes or slots of
similar section to the cutters used, and in a direction diagonal, or at right angles to
the bar, and obliquely in the vertical plane; these diagonal holes are cut from both
sides of the bolder, so that the cutters may be inserted from either side, and project
beyond the end of the holder. At the rear end of the holder a screw thread is formed
in the bore, into which is fitted a set screw with suitable head for turning it; this
screw presses upon the end of a loose bar, which is made to fit the longitudinal hole;
and the other end of this bar which is cut obliquely, further. presses upon the steel
cutters which are placed in the diagonal slots at other end of holder, and by tightening
the screw the cutters are firmly held in position. Upon the side of the holder is cut
a short slot, placed preferably near the cutter end of it, and through which, passes a
small knob or pin, fitted to the loose bar in the longitudinal hole, by which means the
said loose bar is prevented from rotating, and may be slightly withdrawn when the set
screw is released, and the cutters can then be readily taken out.
When the holder is of circular section for boring purposes it is held in a vee block
of usual construction.
Dated this 17th day of October 1890.
H. BOSWELL LEE.
COMPLETE SPECIFICATION.
An Improved Tool-holder for Lathes and other Machine Tools.
I, HENRY BOSWELL LEE, of 11, Pratt Street, Camden Town, N.W., 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:-
This my said invention relates to certain new and useful improvements in the con-
struction of tool-holders, which invention has for its object, the clasping and retaining
the cutting tool of a lathe, plane, or similar machine; and in such a manner that the
cutter is firmly held in the said holder so as to admit of the former being used
close to the slide rest or other object to which the holder may be attached. By the
use of this my said improved tool-holder cutters made from ordinary section steel may
be used, and also readily attached to, and detached from the holder.
I now proceed to describe my said invention, reference being had to the accom-
panying drawings, and the figures and letters of reference marked thereon; similar
letters indicating like parts throughout.
Fig. 1 is a sectional plan of my improved tool-holder.

page_text: Fig. 5 is an end elevation thereof, also showing a V-block whereby the holder is
held in a slide or other rest.
My holder when constructed consists of a bar or tube A, of steel, iron, or other
suitable metal or material, and cf square, circular or other convenient section, and
having formed within it a longitudinal hole B, which extends nearly its whole length,
one end, however, being left solid, as shown at C. Through this solid end of the
holder and passing through the end of the said longitudinal hole B, are cut holes or
slots D, D, of similar section to the cutters used, and in a direction diagonal, or at right
angles to the bar, and obliquely in the vertical plane. These diagonal holes D, D, are
cut from both sides of the holder, as shown in the drawing, one hole being occupied
by the cutter E. Two holes or slots, being preferably made, in order that the cutter E
may be inserted from either side, and project beyond the end of the holder. At the
rear end of the holder a screw-thread is formed in the bore B, and into which is
fitted a set-screw G, with a suitable head G for turning it. This screw presses upon
the end of the loose bar H, which is made to fit the longitudinal hole B; and the
other end of this bar, which is formed preferably with either a rounded or obliquely
cut end, as shown at H¹, further presses upon the steel cutter E which is placed in
either of the diagonal slots D, D, at the other end of holder, and by tightening the
before-mentioned screw G the cutter E is firmly held in position. Upon either side
of the holder, preferably on one side only, is cut a short slot J communicating with
the longitudinal hole B, and through which passes a small knob or pin K, fitted
to the loose bar H in the longitudinal hole B, by which means the said loose bar His
prevented from rotating, and may be slightly withdrawn when the set-screw G is
released, and the cutter E can then be readily taken out. In order to prevent the said
bar H from rotating I may adopt an alternative method of making a short recessed
slot in the said bar H, and insert a short pin or screw in the side of the holder H
which will project into the slot, and whilst allowing of the movement of the bar H will
not admit of its rotation. Or I may omit either of the aforesaid arrangements to
prevent rotation of the bar H, as shown in Fig. 4.
When this my improved holder is used for boring purposes it is preferably made of
circular section, and when constructed in this way it is held in a V-block L of usual
construction, as shown in Fig. 5, or other suitable device.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what 1
claim is :-
1st. An improved tool-holder for lathes and other machine tools; the said holder
consisting of a bar of metal, or suitable material, and of square or other suitable section,
and having a hole extending nearly its whole length; the mouth of said hole screw-
threaded to receive an adjusting-screw, the adjusting-screw, holes or slots of similar
section to the cutters used arranged in the end of and diagonally, or at right angles,
to the bar, and obliquely to the vertical plane thereof; said holes being cut from
both sides of the holder; a loose bar inserted within the holder; a slot or slots formed
in one or two sides of the tool-holder, and a headed pin or pins inserted in and
projecting from the surface of the loose bar and through the slot or slots, all sub-
stantially as and for the purposes herein before described and illustrated in the drawings
hereunto annexed.
2nd. An improved tool-holder for lathes, and other machine tools; the said tool-
holder being especially applicable for boring purposes, and consisting of a bar of metal
or suitable material of convenient section, and having a hole extending nearly its
whole length, the mouth of said hoie screw-threaded to receive an adjusting-screw,
and adjusting-screw, holes or slots of similar section to the cutters used arranged in
the end of and diagonally or at right angles to the bar, and obliquely in the vertical
plane thereof; a loose bar inserted within the holder; all substantially as and
for the purposes hereinbefore set forth and illustrated in the drawings hereunto
annexed.

page_text: 3rd. The herein described tool-holder consisting of the various parts thereof all
arranged in combination, substantially as and for the purposes hereinbefore set forth
and illustrated in the drawings hereunto annexed.
To
1
1000
H. BOSWELL LEE.