Improved Means for Attaching Tools to Rock Drills.
Year: 1898

page_text: Improved Means for Attaching Tools to Rock Drills.
I, VICTOR ISIDORE FEENY, of 60, Queen Victoria Street, in the City and County
of London, Fellow of the Chartered Institute of Patent Agents and Member of
the Institute of Mechanical Engineers, do hereby declare the nature of this
invention to be as follows:-
My invention relates to a chuck or holder for rock drills which is especially
designed to automatically lock the drill in place by the act of introducing and
starting it to work, and to provide a means for easily releasing when it is to be
removed. It consists in details of construction which will be more fully
explained hereafter.
Various devices have been employed for fixing the shanks of rock drills in
the end of the movable driving head or piston, but these are difficult to keep
tight, and more difficult to release for the removal of the drills.
In my device the drill shank or head, which is usually made of hexagonal
steel with a suitable form of cutting bit at one end, is tapered at the upper end.
The drill socket is made of sufficient size to receive the semi-cylindrical seg-
ments, one segment being permanently fixed in one side of the chamber which is
formed to receive these segments, and the other segment being fitted so as to be
movable to increase the distance between itself and the first mentioned segment.
This latter part is permanently fixed by a pin passing through a hole made
in it or by other suitable or desirable means.
The second part or segment has a channel formed in the back adapted to
receive a wedge-shaped key which passes transversely through the socket piece
behind the second part of the chuck.
These parts are ordinarily closed up against each other, the wedge being
driven in sufficiently tight, and the inner portion of the segment is bored, taper-
ing to correspond with the tapering shape of the upper end of the drill shank.
It is then only necessary to insert the drill with a little push which causes it
to bind in the socket, and as soon as the drill is started, the blows upon the
rock will lock it firmly in place.
Whenever it is desired to remove the drill the key is driven backward so as
to relieve the pressure upon the second segment and the latter can then be moved
away from the first segment so as to allow the drill to be readily removed.

page_text: The key may have an offset so that the end is of less diameter than the part
which normally lies behind the second segment so that when the key is driven
backward, this reduced portion is brought behind the segment and thus allows
it to be moved sufficiently for the easy removal of the drill.
Various devices may be employed for locking this segment, or allowing it to
be moved backwardly, but I have found that shewn in the present arrangement
to be very effective. The channel for the key is formed partly in the segment
and partly in the body of the holder so that when it has been loosened, the
segment will still remain in place and not fall out.
Dated this 26th day of Annil 1000
I, VICTOR ISIDORE FEENY, of 60, Queen Victoria Street, in the City and County
of London, Fellow of the Chartered Institute of Patent Agents and Member of
the Institute of Mechanical Engineers, 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 a chuck or holder for rock-drills which is more
especially designed to automatically lock the drill in place by the act of intro-
ducing and starting it to work, and to provide a means for easily releasing when
it is to be removed.
It consists in details of construction which will be more fully explained by
reference to the accompanying drawings, in which :-
Figure 1 is a vertical section of my device on line y y of Figure 2.
Figure 2 is a transverse section on line al of Figure 1.
Figure 3 is a similar section on line 2 of Figure 1 and shewing shank in
place.
Various devices have been employed for fixing the shanks of rock-drills in the
end of the movable driving-head or piston; but these are difficult both to keep
tight and to release for the removal of the drills.
In my device the drill shank or head, which is usually made of octagonal steel
with a suitable form of cutting-bit at one end, is tapered, as shewn at A, at
the upper end.
The drill-socket is made of sufficient size to receive the bush or semi-cylin-
drical segments 13 B1, the segment B being permanently fixed in one side of the
chamber, which is formed to receive these segments, and the other segment 131
being fitted so as to be movable to increase the distance between itself and the
part B. The socket consists of a single integral piece and extends at one side
of the centre of its shank a greater distance than at the opposite side to pro-
vide a thickened portion P, against which the wedge-shaped drive-key is seated,
said socket having also an internal shoulder at S to form an abutment for the
ends of the segments. The part B is permanently fixed by a pin C, passing
through a hole made through its upper portion and adapted to coincide with a
similar hole made through the drill-socket. The part B₁ has a channel formed

page_text: in the back adapted to receive the wedge-shaped key D, which passes trans-
versely through the socket-piece behind the part B₁ of the chuck. These parts
are ordinarily closed up against each other, the wedge being driven in sufficiently
tight, and the inner portion of the segment is bored tapering, to correspond with
the tapering shape of the upper end A of the drill-shank. It is then only neces-
sary to insert the drill with a little push, which causes it to bind in the socket,
and as soon as the drill is started the blows upon the rock will lock it firmly
in place.
Whenever it is desired to remove the drill the key D is driven backward, so
as to relieve the pressure upon the segment 131, and the latter can then be moved
away from the segment B, so as to allow the drill to be readily removed.
In the present case I have shewn the key as having an offset at co, so that
the end is of less diameter than the part which normally lies behind the
segment B; therefore when the key is driven backward, this reduced portion
is brought behind the segment and thus allows it to be moved sufficiently for
the easy removal of the drill. This key D may be made without the offset, as
is shewn by dotted line E, Fig. 2, which arrangement is equally effective.
Various devices may be employed for locking this segment or allowing it to
be moved backwardly; but I have found that shewn in the present arrangement
to be very efficient. The channel for the key is formed partly in the segment
and partly in the body of the holder, so that when it has been loosened the
segment will still remain in place and not fall out. As already stated the
shank A of the tool is indicated in its place between segments or bush BB' on
Figure 3.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. An improved holder for securing cutting-bits or tools to rock-boring
machines, comprising an integral tool-socket fitted with an internal bush formed
by segments tapered inwardly and wherein the shank of the said tool secures
itself when the machine first commences to work, one of which segments is
permanently secured to the said socket, the other being movable within the same
and capable of being locked in its desired position by means of a transverse and
tapering key, substantially as herein described.
2. An improved drill-holder consisting of a drill-socket, a segment in one side
of said socket having an inclined or tapered inner wall and a straight outer
wall to fit closely for its entire length the corresponding wall of the socket,
a second segment in the opposite side of the socket, having an inclined or
tapered inner wall and a straight outer wall, the inner ends of both segments
abutting against an internal shoulder in the drill-socket, a pin driven trans-
versely through the upper end of the first-named segment and the socket, and
permanently securing said segment in place, and a single wedge-shaped key
centrally placed behind the other segment and having a portion of reduced
diameter which is adapted to be moved in line with the said movable segment
to release the drill shank, said movable segment and socket having adjacent
faces channeled to receive said key whereby the segment will remain in place when
the key is moved to bring its reduced portion behind the same, substantially as
and for the purpose specified.
3. An improved drill-holder consisting of a drill-socket formed as a single
integral structure and extended at one side of the centre of its shank a greater
distance than at the opposite side, to form a thickened portion, said socket
having also an internal shoulder; opposing segments in said socket each having
a tapering inner wall, one of said segments being permanently secured in the
socket and the other readily removable, a pin passing through one end portion
of the permanent segment and a single wedge-shaped drive-key centrally located

page_text: behind the movable segment and seated in corresponding recessed portions in the
contiguous faces of the segment and the inner wall of the socket whereby the
movable segment is secured and the drill locked in place.
Dated this and do Tanuow 1800
For the Applicant,
GEDGE & FEENY,
60, Queen Victoria Street, London, E.C., Chartered Patent Agents.