Year: 1889

page_text: I, WILLIAM BASHALL, of No. 17, Bear Alley, Farringdon Street, in the County of
Middlesex, 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 :-
My invention relates to improvements in tool-holders; and consists in providing a
tube, slotted to receive the tool which is held within the slotted tube, and which tube
can be moved about its axis within its seat in the head of the holder, whereby the
angle between the tool-edge and the work can be varied at will. In addition to the
aforesaid motion of the tool about its axis, the head of the holder can be moved
about its vertical axis.
In order that my invention, and the means by which the same is to be carried into
practical effect, may be thoroughly understood, I will now describe them in detail,
referring in so doing to the accompanying drawing which is to be taken as part of this
specification and read therewith, and in which
Fig. 1 is a side elevation.
Fig. 2 is a sectional side elevation, and
Fig. 3 is a front elevation.
A is the ordinary shank, terminating in an eye through which the shank of a screw
bolt B is passed, and fitted with a tightening nut in the usual manner. The head b
of the bolt is bored out at an angle with the axis of the bolt to receive a tube C.
D is the cutter, preferably other than circular in cross section, fitting in a seat of
corresponding cross section formed axially through the tube C.
It is, of course, necessary that the cutter be held immovably within the tube, as
far as regards motion about its axis, and this is effected by the slot in the tube which
adapts the latter for being closed tightly around the cutter when the bolt-head bis
tightened up against the under face of the cutter, thereby forcing the top of the tube
against the collar d.
The part 6 of the bolt-head between the seat of the tube C and the bolt-shank B
is of a smaller diameter than the lower part b, and is fitted with a locking collar d
rather longer than itself, and having its opposite faces properly shaped to bear fairly
upon the shank-eye and the tube C respectively.

page_text: The excess of length of the collar, which adapts it for the purpose of locking the
tube immovably between the head band it, may be either detachable, as drawn, or a
fixed extension of the eye and of equivalent dimension.
By moving the head of the bolt about its axis, the cutter can be adjusted in either,
or both, of two planes, i.e., it can be set at any angle with the shank, and by turning
the cutter and tube about their common axis within the seat of the latter, the angle
presented by the cutter to the material may be varied without re-setting or re-grinding
the cutter-nose.
To prevent the tube C being drawn out of its seat when the cutter is withdrawn for
the purpose of being re-ground, a set screw 62 or equivalent device is passed through
the head into a groove in the tube. The groove is adapted to permit of the necessary
motion of the tube about its axis when the cutter is to be adjusted in respect of the
angle which its nose makes with the work, by being continued for a short distance
about the periphery of the tube.
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 I
claim is:
1. The combination of cutter, tube adapted to receive the said cutter and to hold
it therein immovably in respect of any motion about its axis, tube-seat, and locking
collar, as set forth.
2. The combination of sbank-head and cutter whereby the latter may be adjusted in
either or both of two planes as set forth.
D
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