AN IMPROVED ROCK-DRILLING MACHINE TO BE WORKED BY HAND
Year: 1879

page_text: COMPLETE SPECIFICATION filed by the said Carl Pieper at the Office of
the Commissioners of Patents on the 7th June 1879.
CARL PIEPER, Civil Engineer and Patent Agent, of 74, Belle-Alliance-Strasse,
Berlin, S.W., Prussia. "AN IMPROVED ROCK-DRILLING MACHINE TO BE WORKED
BY HAND." A communication from Jacob Faber, of Barmen, Prussia, Engineer.
This Invention relates to certain improvements in the rock-drilling machine
described in the Specification of the Patent, No. 2606, granted to my correspondent
on the 5th May, A.D. 1878.
These improvements consist,-
Firstly. In modifications of the arrangement of driving-spindle.
Secondly. In arrangements by which the advance or feed of the driving-spindle
is regulated automatically according to the actual progress of the work.
Thirdly. In an apparatus for delivering water to the drill at its cutting edge;
and
Fourthly. In certain modifications of the framing.
As regards the driving-spindle, it has been explained in the said Specification,
No. 2696, A.D. 1878, that the ends of the spindle are square in section; that one
of them is straight and the other twisted; that these ends work up and down in
the bosses of ratchet wheels, and that thereby a slight rotary motion is imparted to
the spindle at every stroke.
Now instead of making the ends of the spindle square in section or in general
prismatical they may be round, one of them being provided with a straight groove,
the other with a groove running in a spiral line along the spindle, and the ratchet
wheels having corresponding feathers; or the feather may be on the spindle, while
the wheels are provided with grooves. Another modification consists in making
the spindle according to Fig. 1 of the accompanying Drawings, the screwed part w,
which has either a straight or a spiral groove, being adapted to slide in the boss of
wheel z, while the other end is either round with a groove or a feather, or
prismatical, the said groove or feather or the edges of the prism at this end being
straight in case the groove at the opposite end is spiral, and vice versa.
The second improvement is shown in Fig. 2. The disk on which the cam-disk h
acts has an inside screw thread by which it works forward or backward on the
screw thread of the driving-spindle when it is rotated. Without any additional
mechanism this arrangement would cause an advance of the spindle in a similar
manner as in the original machine. For the purpose however of operating this
021

page_text: advance in proportion only as the hole to be drilled becomes deeper the following
arrangement is used.
The wheel is, by means of a spiral spring ³, in such connection with a toothed
sleeve that the latter is caused to turn with the above-mentioned wheel, it being
however capable of sliding upon the driving-spindle. The face of the disk lis
provided with teeth which correspond to those of the sleeve. During that part of
the rotation of said disk l during which its teeth are not in gear with those of g² it
turns upon the screw-threads of the driving-spindle in the direction of the arrow 1,
and thus operates the advance or feed of the said spindle. But as soon and as long
as the teeth of & g are in gear a change takes place, as the sleeve g² turns with
the ratchet wheel in proportion to the rotation of the driving-spindle & in the
direction of the arrow 2. Therefore whilst the said teeth are in gear the disk is
caused to partake in the rotation of the driving-spindle, & during this period no
advance takes place. Now if the progress of the work is not proportionate to the
advance or feed of the drill the disk will not reassume its lowest position, & will
consequently at its next back stroke come sooner into gear with 93, whereby the
drill will be less advanced. The advance or feed of the driving-spindle is therefore
regulated automatically according to the actual progress of the work.
For the purpose of facilitating the operation of drawing back the driving-spindle
when a new hole is to be commenced, or for changing the drill, the ratchet-wheel is
fixed by the set-screw a² so as to prevent the spindle from turning, the disk / being
then rotated in the direction of arrow 2 the spindle will be screwed back.
The apparatus for delivering water to the drill is also shown by Fig. 2.
It consists of a plunger m², a valve-box n², and of valves p² & 73; the valve p³,
which serves as delivery-valve, is fitted in the fore-end of the hollow driving-
spindle w, and the opposite end of the spindle is provided with a stuffing-box
surrounding the hollow plunger m². The suction-valve is contained in the valve-box
which is fitted to the column 6. During the back stroke of the driving-spindle
the valve p opens & admits water to the drill; during its forward stroke p² closes
& opens, whereby water is admitted through the hollow plunger into the driving-
spindle. The screw 82 of the valve-box m² serves for regulating the quantity of
water fed to the drill, so that when the drill rises the water returns partly into the
suction-pipe by passing through the opening 2, which may be closed more or less
by the screw 8².
When beginning the drilling the driving-spindle is filled with water which is
admitted through the opening closed by the screw 8 of the valve-box.
Instead of the above-described arrangement the hollow spindle may however be
provided with any other means for delivering water to the hollow spindle, such, for
instance, as a small pump; or the spindle may be solid & the drill be watered in
any other manner. The drill shown at Fig. 2 is composed of a steel tube; for
making the edge of the same recourse must be had to welding for closing the hollow
part of the tube. Above the edge of the drill is provided a hole for the escape of
the water.
If it be desired to shift the machine clear of the drilled hole without displacing
the framing, either for cleaning the said hole or for any other purpose, the pawl u³
fixed to the column b' is raised, & the whole machine may then be turned in the
bearing w around the axis of the column.
The modifications of the framing are shown by Figs. 3 to 6, and partly by Fig. 2.
According to the latter Figure a sleeve 2 provided with handwheel works with an
inside screw on the screwed end of the pillar b¹. The said sleeve bears against the
springing split clamp 33, which may be tightened on the point 3 by a screw. This
In order to fix the
clamp might also be composed of two parts united by screws.
framing against the rock to be drilled the clamp y³ is loosened, is pulled out of
the hollow tube b' to the required extent, & y² is made fast upon x², it having been
however previously brought into contact with the sleeve, whereupon the latter is
turned towards the left until the point bears firmly against the rock. If
preferred the clamp y² might be connected with the sleeve by a suitable arrangement

page_text: permitting the sleeve to turn independently of the clamp without however discon-
necting itself, thus preventing the clamp, when the point ³ is being drawn out,
from following the motion of the said point.
The frames represented by Figs. 3 to 6 may all be used together with the drilling
apparatus described in Specification No. 2696, A.D. 1878, or with the above
described improved apparatus.
The frame, Fig. 3, is intended to rest freely on the ground, and its struts might
be similar to those shown in Fig. 6, or to those represented in Fig. 1 & 9 of the
Specification annexed to the previous Letters Patent. This frame is only adapted
for drilling downwards, either vertically or obliquely. Its construction with two
columns allows the use of two fly-wheels.
Fig. 4 shows a universal framing which can be employed as well resting upon
the ground as fixed between two sides of galleries. It has only one column & one
fly-wheel, & may be taken apart entirely.
Figs. 5 & 6 show a universal fraining with two columns & two fly-wheels, which
may be used in the same manner as that above-described with regard to Fig. 4;
Fig. 6 might partly be considered as a side view of the framing shown at Fig. 4.
Having thus described the nature & object of this Invention, and the manner
in which it is or may be put into practice, as communicated to me by my corre-
spondent, I claim as new and essential features of the same,-
First. The driving-spindle having its ends constructed as described in combination
with the ratchet-wheels r & z for the purpose specified.
Second. In combination with a rock-drilling-apparatus the disk 7 provided with
teeth on its face and the sleeve g², also provided with teeth, and connected by
spring with ratchet wheel z, as and for the purpose specified.
Third. In combination with the hollow driving-spindle w the pumping arrange-
ment serving to deliver water to the drill, as hereinbefore described.
Fourth. In combination with the pillar or tube b' and the point x² the split
clamp and the sleeve provided with hand-wheel & screwing on the end of
pillar b, as and for the purpose specified.
Fifth. The combination of either of the frames represented by Figs. 3 to 6 with
the described drilling apparatus, or with the apparatus described in the Specification
No. 2696, A.D. 1878.
In witness whereof, I, the said Carl Pieper, have hereunto set my hand and
seal. this Eighteenth day of April 1879.