Improvements in Hand-operated Rock-boring Machines.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in Hand-operated Rock-boring Machines.
A communication from LOUIS THOMAS, of Montegnée-les-Siège, in the Kingdom
of Belgium.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Member of the Institution 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:-
This invention consists in certain improvements in machines for boring or drilling
rock by hand, which not only facilitate the boring operation, but simplify even the
construction of the machine itself. The improvements mainly reside in the method
of supporting the boring spindle or rod in the casing; the arrangement of
the casing in the boring-frame, and lastly the peculiar arrangement of the frame
itself.
In the accompanying drawings Figs. 1 to 4 illustrate the improved arrangement
of the boring spindle in the casing.
C is the boring rod or spindle. D D¹ is a split nut, the lower section D' of which
is stationary, while the upper half D is capable of moving up and down in the
sheath or casing under the combined action of the crank-shaft E and lever F
pivotted to the said shaft E at G and operating the same.
In Figure 1 the upper part D of the nut is represented in its highest position,
while in Figure 2 it is shown in its lowest position, both figures being sections in
the plane of the axis of the spindle or rod. Figure 4 is a cross-section of Fig. 1
and Figure 3 a rear elevation of Fig. 2.
The sheath or casing J of the boring rod or spindle is embraced on both its
front sides by a bent piece or yoke H in such a manner, that when the upper half D
of the nut is moved upwards, the yoke H also rises with it. In the position shown
in Figure 2 the two halves D D¹ of the nut grasp the spindle C and the latter at
the same time rests upon the ring of the yoke H on either side, i.e. outside of the
casing J.
When the shaft E from the position shown in Fig. 2 is turned upwards, the
upper half D of the nut rises and gets clear of the spindle C, and the spindle also.
is raised clear of the lower half of the nut by the yoke H. In this position
(Figs. 1 and 4) the boring spindle may therefore be freely displaced in the casing J
from left to right or from right to left independently of the nut D D' while
in the position shown in Figs. 2 and 3 the spindle is tightly grasped by the
screw-thread of the nut D DI, and when it is turned it at the same time performs
a lateral movement backwards and forwards the requisite reciprocating motion being
thus produced.
The sheath or casing J of the boring tool is revolvably fitted in the frame by
means of trunnions or journals K K.
Figures 5 to 7 represent various special arrangements of the frame.
Figs. 8 and 9 are detail views and Figs. 10 and 11 are general views of the
whole arrangement.
Lis the main ring of the boring frame. It is made of angle iron, so that the
extension rails M may be displaced or adjusted therein. In the rails the point or
pin N, adjustable by means of a screw and pivotted lever O, is located, while a
point or pin P is secured also to the frame L. The central portion of the frame L
carries the adjustable slide Q strengthened on the sides at R R and R' R¹. The
pieces R R serve for adjusting the slide or carriage Q on the frame L while the
projections R' R' constitute bearings for the journals K K of the casing J of the
boring rod.

page_text: When the lever S (Fig. 8) is moved to the right, the pivot S' will also move
in the same direction, while the pivot S" will move to the left. The rail T turns
on shaft T and the bults U U are moved inwardly so that the carriage Q may
be displaced in the frame 'L.
The manner of securing the extension rails M in position in frame L is illustrated
by Figure 7 and also by the detail view Fig. 9, this being effected by means of
catches or detents V and pins or studs W.
From Figs. 10 and 11 the entire arrangement and the operation of the whole are
readily apparent.
The boring frame L is fitted up in the gallery between the roof and floor and the
rails M are extended or adjusted upwardly in a convenient manner and then
secured in position by means of the detents V and projection W. The pivotted
lever is then turned until the points or bits N and P have been firmly driven
into the rock. The fitting up of the boring frame is thus completed it being
rigidly fixed in place. The casing J with the spindle and its journals is then fitted
in the carriage or slide Q and the latter is adjusted to the desired level by means
of the bolts U U. The lever F is next operated in such a manner that the two
nut sections D D¹ move away from each other to the utmost extent; then the
boring rod or spindle C, along with the lever X and boring-tool proper Y are
drawn in, whereupon it only remains to close the two halves of the nut to fix
the boring-device in position. The boring or drilling may now be performed
readily and without any loss of time, the lever X being operated to drive the boring
tool forward while by disconnecting the nut-sections D D' a rapid return movement
of the same is produced.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondent, and in what manner
the same is to be performed, I declare that what I claim is,-
1. A machine for boring or drilling rock or the like by hand and in which the
boring spindle C is supported by a sheath or casing J which also encloses a two-
section or split 'nut D D' surrounding or embracing the boring spindle the lower
section D being stationary while the upper section D is by a crank shaft E caused
to move upwards or downwards as the case may be a yoke H being arranged to
operate in such a manner that when the upper half D of the nut 'is moved upwards
it follows the same direction for the purpose of enabling the spindle C to be
released as required substantially as described and illustrated in the accompanying
drawings.
2. In the hand-boring machine the mode of revolvably supporting the casing J
by means of journals K in a frame L in the central part of which is adjustably
arranged a slide or carriage Q fitted with lateral projections R R serving to hold
the carriage Qin position on the frame L the bearings for the reception of the
journals K of the casing J being formed in the carriage Q substantially as described
and illustrated in the accompanying drawings.
3. In the portable boring machine the arrangement of a framing consisting of
the frame proper L in which extension 'rails M are adjustably fitted and guided and
provided with one of the points or pins N whereby the framing is secured in
position for drilling and 'which carries a slide Q which by means of its latéral
shoulders or projections R may be firmly secured in position substantially as
described and illustrated in the accompanying drawings.
Dated this 13th day of October 1805
ALFRED J. BOULT,
Chartered Patent Agent.