Improvements in the Construction of the Stands or Tripods of Rook Drills, and of the Means for Mounting such Drills thereon, and also of the Cradles of such Drills.
Year: 1892

page_text: Date of Application, 16th Feb., 1892
Complete Specification Left, 4th Nov., 1892-Accepted, 10th Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Construction of the Stands or Tripods of Rook
Drills, and of the Means for Mounting such Drills thereon, and
also of the Cradles of such Drills.
We, ALBERT WILLIAMS DAW and ZACHARIAS WILLIAMS Daw, both of
Laurvig, in the Kingdom of Norway, Mining Engineers, do hereby declare the
nature of this invention to be as follows :-
The invention relates to improvements in tripods or stands of rock drills, and
in the means for mounting the cradle of the drill thereon, whereby perfect universal
adjustment is given to all the legs of the tripod or stand, which are also made
telescopic, so that the stand can be fixed in any position on the most irregular
ground and the drill adjusted to bore holes in any required direction from vertical
to horizontal. Further, the tripod or stand is constructed so as to combine strength
with rigidity and steadiness, portability and simplicity of adjustment. By our
improvements in the cradle the wear of the drill cylinder in the guides is auto-
matically taken up and just sufficient resistance automat.cally given to the free
movement of the drill cylinder in the cradle guides as to relieve the feed screw and
nut of all shock of the recoil of the drill, whereby the feed screw and nut are
practically relieved from all wear. Further, the cradle is designed to combine
great strength with rigidity and simplicity of construction.
Our improvements in the tripod or stand of rock drills relate to the method of
connecting the legs thereof to the head in such a way as to permit such legs to be
turned in any direction in relation thereto, and thus enable the drill carried by the
stand to be readily and rigidly fixed in any required position, no matter where the
drill has to work.
For this purpose each leg is pivotted to a pin carried by a part which in its turn
is pivotted to the head of the stand, the two pivots being in planes at right angles
to each other, so as to permit of the leg being turned in any direction. The pivots
referred to have screw threaded ends, and a clamping nut binds on the part which
turns thereon so as to fix same rigidly after it has been turned to the required
position. In order to more readily and certainly ensure the rigidity of the parts
when fixed, we make the portion of the leg which is mounted on the pivot of a
conical form and cause it to enter a corresponding seat in the part which is
pivotted to the head, and such second part has also a corresponding conical portion
entering a similar seat in such head. The tightening of the clamping nuts causes
the conical parts to be forced well home to their seats and binds same rigidly.
therein.
The cradle of the drill is attached to and can revolve freely on the head of the
tripod or stand, for which purpose such bead is preferably made of forked form, and
the two arms of the fork are connected by a round bar which a bearing or plummer
block formed on the underside of the cradle embraces, so that the cradle and
drill can turn on such bar to any required position, and by theu tightening up the
bearing or plummer block so that it clamps the bar the drill will be rigidly fixed in
such position.
In order to permit of the adjustment of the drill in any direction on the stand,
instead of mounting the cradle of same directly on the head of the stard we may
mount a bar so that it can pivot on the head, with means for clamping same thereon,
and then mount the cradle on such bar so that it can pivot round same and be
clamped thereon in the required position.
The cradle guides which carry the drill cylinder are preferably made V-shaped
and correspond to similar projections on the drill cylinder.

page_text: In each of the lower guides of the cradle a recess is made to receive a liner which
is held in position by bolts at each end of the cradle. Springs fitting into suitable
recesses formed in the cradle are inserted below the liner.
The drill is placed in its guides and the bolts holding the liner in position are
loosened, when the springs cause the liner to take up any play there may be between
the projections on the drill cylinder and the guides in the cradle, and also all wear
caused by the movement of the drill in the guides. Further, the springs are given
sufficient tension to cause the liner to force the projections on the drill cylinder
between it and the top guides of the cradle just strongly enough to give sufficient
friction to prevent the too free movement of the drill cylinder in the cradle guides,
and thus to overcome the recoil of the drill when running, whilst allowing its cylinder
to be fed forward readily by the feed screw, thereby releving the feed screw and nut
The tension
from the shock of the recoil and thus practically from all wear.
of the springs, within their limits, can be controlled by loosening or tightening the
bolts holding the liners in position.
Dated this 16th day of February 1892.
ALLISON BROS.,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Construction of the Stands or Tripods of Rock
Drills, and of the Means for Mounting such Drills thereon, and
also of the Cradles of such Drills.
We, ALBERT WILLIAMS DAW and ZACHARIAS WILLIAMS DAW, both of
Laurvig, in the Kingdom of Norway, Mining 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 :---
The invention relates to improvements in tripods or stands of rock drills, and in
the means for mounting the cradle of the drill thereon, whereby complete universal
adjustment is given to all the legs of the tripod or stand, which are also made
telescopic, so that the stand can be fixed in any position on the most irregular
ground and the drill adjusted to bore holes in any required direction from vertical
to horizontal. Further, the tripod or stand is constructed so as to combine strength
with rigidity and steadiness, portability and simplicity of adjustment. By our
improvements in the cradle the wear of the drill cylinder in the guides is
automatically taken up and just sufficient resistance automatically given to the
free movement of the drill cylinder in the cradle guides as to relieve the feed screw
and nut of all shock of the recoil of the drill, whereby the feed screw and nut are
greatly relieved of wear. Further, the cradle is designed to combine great strength
with rigidity and simplicity of construction.
Our improvements are illustrated in the accompanying drawings, in which
Fig. 1 is a vertical section partly in elevation of the tripod or stand.
Fig. 2 a vertical section of Fig. 1 taken at right angles thereto.
Fig. 3 is a plan view of Figs. 1 and 2.
Fig. 4 is a front elevation of the tripod or stand, showing the drill cradle
mounted directly on the head of such stand, the cradle being in cross section.
Fig. 5 is a longitudinal section of Fig. 4.
Fig. 6 is a side elevation partly in section of the tripod or stand, showing the
drill cradle mounted on a bar pivotted to the head of such stand, the cradle being
of a slightly modified construction, and
Fig. 7 is a cross section of the cradle shown in Fig. 6.
Our improvements in the tripod or stand of rock drills relate to the method of
connecting the legs thereof to the head in such a way as to permit such legs to be
turned in any direction in relation thereto and thus enable the drill carried by the

page_text: statid to be reauny and rigidly nxea in any required position, no matter where the
drill has to work.
For this purpose each leg A is pivotted to a pin B carried by a part C which in
its turn is pivotted at D to the head E of the stand, the two pivots B and D being
in planes at right angles to each other, so as to permit of the leg being turned in
any direction. The pivots B and D have screw threaded ends, and a clamping
nut F binds on the part which turns thereon so as to fix same rigidly after it has
been turned to the required position. In order to more readily and certainly
ensure the rigidity of the parts when fixed, we make the portion a of the leg A
which is mounted on the pivot B of a conical form and cause it to enter a corre-
sponding seat in the part C which is pivotted to the head E, and such part C has
also a corresponding conical portion c entering a similar seat in such head E. The
tightening of the clamping nuts F causes the conical parts a and c to be forced
well home to their seats and binds saine rigidly therein. In the drawings a single
pivot D at the front of the head E serves to receive and fix both of the front
legs A, but a separate pivot might if desired be provided for each of such front
legs.
с
The cradle G of the drill is attached to and can revolve freely on the head E of
the tripod or stand, for which purpose such head is preferably made of forked form
as shown, and the two arms e, e, of the fork are connected by a round bar E', which
a bearing or plummer block H formed on the underside of the cradle G embraces,
so that the cradle and drill can turn on such bar E¹ to any required position, and
by then tightening up the bearing or plummer block H by means of the bolts
and nuts h so that it clamps the bar E, the drill will be rigidly fixed in such
position.
In order to permit of the adjustment of the drill in any direction on the head E,
instead of mounting the cradle of same directly on the head of the stand, we may
as shown in Fig. 6 mount a bar I so that it can pivot on the bar E' of the head,
with means (such as the bolts and nuts i) for clamping same thereon, and then
mount the cradle on such bar so that it can pivot round same and be clamped
thereon in the required position, in the same manner as previously described when
the cradle is mounted directly on the head.
The cradle guides 9 which carry the drill cylinder are preferably made V-shaped
as shown, and correspond to similar projections on the drill cylinder.
In each of the lower guides of the cradle a recess is made to receive a liner k,
which is held in position by bolts at each end of the cradle (see Fig. 5), such
liners being prevented from endwise movement by ears or parts bent down over each
end of the cradle. Springs m of any suitable form are inserted below the
liners k.
The drill cylinder is placed in its guides g, g, and the bolts l holding the liner in
position are loosened, when the springs m cause the liner to take up any play
there may be between the projections on the drill cylinder and the guides g of the
cradle, and also all wear caused by the movement of the drill cylinder in the guides.
Further, the springs m are given sufficient tension to cause the liner to force the
projections on the drill cylinder between it and the top guides g of the cradle just
strongly enough to give sufficient friction to prevent the too free movement of the
drill cylinder in the cradle guides, and thus to overcome the recoil of the drill when
running, whilst allowing its cylinder to be fed forward readily by the feed screw,
thereby relieving the feed screw and nut from the shock of the recoil and thus
practically from all wear. The tension of the springs m, within their limits, can be
controlled by loosening or tightening the bolts holding the liners k in position.
In Figs. 4 and 5 the springs m are shown acting directly on the back of the
liners & to force same outwards, such springs being arranged at right angles to the
top surface of the liners, while in the slight modification shown in Figs. 6 and 7
such springs are arranged at right angles to the axis of the cradle, and a follower o
with an inclined outer surface is interposed between the springs m and the liners k,
the action being similar in both arrangements.

page_text: It will be readily understood that any other arrangement and form of springs
other than those shown may be employed for forcing the liners outwards.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. The improved tripod or stand for rock drills consisting in a head E to receive
the drill and which is provided with as many conical seats as the stand has legs;
parts C each having a conical projection c to enter one of such seats; bolts D and
nuts F (or their equivalents) for tightening or binding such parts C in the seats of
the head, each part C also having a conical seat in a plane at right angles to its
conical projection c; a conical projection a formed on each leg A and entering the
conical recess in one of the parts Č; and bolts B and nuts F (or their equivalents)
for tightening or binding each leg A in the seats of parts C, all substantially as
set forth.
2. In a cradle for rock drills the combination of a liner mounted in a recess in
the guides thereof and of a spring or springs acting upon the rear of such liner,
substantially as and for the purpose specified.
Dated this 29th day of September 1892.
ALLISON BROS.,
Agents for the Applicants.