IMPROVEMENTS IN THE CONSTRUCTION OF ROCK DRILLS
Year: 1878

page_text: LETTERS PATENT to Peter Jensen, of 33, Chancery Lane, in the County of
Middlesex, for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF
ROCK DRILLS." A communication from abroad by Ludwig Schrader, of
Essen, and Joseph Fritz, of Suelz, near Cologne, both in the German
Empire.
Scaled the 24th January 1879, and dated the 29th July 1878.
PROVISIONAL SPECIFICATION left by the said Peter Jensen at the Office
of the Commissioners of Patents on the 29th July 1878.
PETER JENSEN, of 33, Chancery Lane, in the County of Middlesex. "IMPROVE-
MENTS IN THE CONSTRUCTION OF ROCK DRILLS." (A communication from abroad
by Ludwig Schrader, of Essen, and Joseph Fritz, of Suelz, near Cologne, both in the
German Empire.)
According to this Invention the power of the workman is applied to a crank
handle which he turns, whereby the necessary blows against the mineral are
produced all as herein-after described.
The crank handle spindle carries a tooth wheel gearing with a pinion, on the
spindle of which is a cam acting against a roller fitted in the end of a forked or
double bracket fastened by a nut to a spindle which can turn independently thereof,
and is fitted with an outer flat helical spring and runs in bearings.
The spring serves to bring the spindle against the rock and the cam pulls it
back.
The spindle is provided with a socket for holding a "drill" or chisel for working
against the mineral surface; it has also a pawl wheel gearing with a pawl at each
side, actuated by lever gear from the crank handle spindle.
The drill rotates when the spring is compressed.

page_text: The harder the rock operated on the smaller should the angle of rotation
be; this is regulated by changing the relative position of parts of the lever
gear.
The apparatus may be mounted and made to slide on a frame consisting of two
bars with a screw between; this screw is held at one end of the frame and has a
nut fitted with worm wheel and held in bearings under the apparatus. The worm
wheel is operated by an endless screw or worm actuated by the crank handle afore-
said, which is turned quicker or slower, according to the quality of the rock, or the
worm may be operated by other connection from the aforesaid lever gear,
A special handle may be fitted to run the machine back quickly. The whole 1
machine is clamped on to an upright column.
A small truck on wheels serves to carry the apparatus, and can be fitted with a
water reservoir and air pump. A jet of water may thus be sent into the bore hole
through an india-rubber hose fitted with cock.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Peter Jensen in the Great Seal Patent Office on the 29th January
1879.
PETER JENSEN, of 33, Chancery Lane, in the County of Middlesex. " IMPROVE-
MENTS IN THE CONSTRUCTION OF ROCK DRILLS." A communication from abroad
by Ludwig Schrader, of Essen, and Joseph Fritz, of Suelz, near Cologne, both in the
German Empire.
The said Invention consists in improvements in the construction of apparatus for
drilling rocks and other minerals.
The machine, which is mounted on a frame securely and rigidly fixed in position
by adjustable bearings, is actuated by means of a crank handle, having on the
spindle thereof a toothed wheel gearing into a pinion, on the spindle of which is a
cam acting against a bar or friction roller fitted in the end of a forked or double
bracket, connected to a small sliding carriage and fastened by a nut to one end of a
spindle or rod capable of turning independently thereof.
The spindle or rod passes through an aperture in a projection or bearing fixed to
the body of the machine, and through the centre of a flat helical spring, and has
fixed thereon a flange or collar which bears against one end of the said helical
spring, the other end of the latter bearing against the before-mentioned fixed pro-
jection or bearing.
The opposite end of the spindle or rod is provided with a socket for holding the
"drill" or other tool for working against the mineral surface.
In order to obtain the necessary revolution of the tool, the spindle has mounted
thereon a disc provided with teeth which project between the end of the spring and
the before-mentioned fixed projection or bearing.

page_text: The toothed disc is actuated by a lever to which an up-and-down motion is.
imparted by a double or compound lever moved by an eccentric actuated by the
cam spindle in such a manner that the turning of the drill spindle is only effected.
when the spring is being compressed.
The drill must be turned more or less after each blow, according to the nature of
the mineral to be operated upon, such variation of action being regulated by
changing the points of the double lever on the eccentric.
The frame on which the machine is mounted consists of two rods connected at
both. ends, having between them a parallel spindle or rod provided with a screw.
thread or worm, into which gears a worm wheel carried by a bearing attached to
the machine, the said worm wheel gearing into a similar wheel mounted on a spindle.
having fixed thereon at each end a pinion, into the teeth of which a toothed catch
attached to the before-mentioned sliding carriage takes.
When it is desired to move the machine back on the frame, the worm spindle of.
the frame is revolved.
:
The whole machine and frame are by preference mounted on a wheeled truck for.
facilitating transportation, which truck may be provided with a water reservoir.
having in connection therewith an air pump, by which means the water necessary
for carrying on the operation is supplied to the head of the tool through any suitable
tubing.
I will now proceed to refer to the annexed Drawings from which the nature
of the said Invention will be more clearly understood.
The same letters of reference refer to similar parts in the several Figures.
Figure 1 is a cross section of the machine shewing the toothed disc for rotating
the drill spindle; Figure 2 is à longitudinal section; Figure 3 is a top view; and
Figure 4 is a detached view of a drill and apparatus connected therewith for
supplying water to the head thereof.
A is the frame on which the machine is mounted; B are the adjustable bearings;
C is the crank handle, on the spindle c of which is the tooth wheel D gearing into the
pinion E on the shaft e; F is the cam; G, the friction roller; g, the forked bracket;
g¹, the sliding carriage; H, the drill spindle or rod; h, the flange or collar thereon;
J is the fixed bearing or projection; I is the. helical spring; K is the socket for
holding the tool L; M is the toothed disc on the spindle; m, pawls for preventing
the backward movement of the same; m', the lever; and m³, the double or
compound lever; N is the eccentric for actuating the latter; O is the worm spindle
connected to the frame, and gearing into the worm wheel o carried by the bearing o',
and gearing into a wheel on the spindle of which are fixed the pinions o actuated by
the toothed catches o³; P is the crank handle for producing the revolution of the
worm spindle; and Q is the fly wheel of the machine.
In Figure 4, which represents an apparatus for supplying water to the tool head,
but which does not form part of the present Invention, L is the tool having a
channel therein opening near the head; the other end of the channel is placed in.
connection with the hollow water-tight bush R, to the interior of which water passes
through the pipe S, and thence through the channel Zinto the bore hole.
The action of the apparatus is as follows:-The frame A having been rigidly fixed
in the gallery or other desired position by means of the adjustable bearings B, which
may be of any suitable or known construction, the crank handle C is turned, and
motion communicated through the wheels D and E, thereby actuating the cam F,
which, as it revolves, forces back the roller g, and with it the sliding carriage g', and
consequently the spindle H and tool L are drawn back, and the flange or collar h
bearing against the end of the spring I compresses the same against the fixed
bearing or projection J.
The revolution of the crank handle is continued until the end of the cam passes
clear of the roller g, when the spring is instantly released and regains its normal
position, at the same time driving the end of the tool with force against the surface.
to be operated upon.
The drill spindle is caused to revolve to the desired extent by the action of the

page_text: double lever m² connected to the eccentric N. on the lever m², which in its upward
movement comes into contact with the teeth of the disc M and moves it a certain
distance at each revolution of the crank handle.
In order that the machine may be advanced correspondently with the increased
depth of the bore hole, the hooked catches o³ attached to the sliding carriage, and
which are caused by means of springs to take into the teeth of the pinions o² at each
withdrawal of the sliding carriage, move the said pinions round to the desired
extent and cause the worm wheel on the same spindle to revolve, which transmits
its motion to the worm wheel o, which is thereby caused to travel a certain
distance along the worm spindle O, moving with it on the frame the whole of the
machine.
When it is desired to move the machine back on the frame in order to replace the
tool or for any other desired purpose, the crank handle P is actuated and motion
transmitted through the wheels V to the worm spindle O.
Having thus described and ascertained the nature of the said Invention, and the
manner in which it is to be performed, I would observe in conclusion that what I
consider novel and original, and therefore claim as constituting the Invention secured
by the said in part recited Letters Patent, are,-
First. The combination and arrangement of a spring and cam, substantially as
and for the purposes herein-before described and set forth.
And, Secondly. The combination of a spring and cam employed in connection with
the arrangements of mechanism herein-before described, all substantially as and for
the purposes herein set forth.
In witness whereof, I, the said Peter Jensen, have hereunto set my hand
and seal, this Twenty-seventh day of January, in the year of our Lord
One thousand eight hundred and seventy-nine.
DEED TNCBN 1
PETER JENSEN. (L.S.)