Improved Rock Drilling Machine.
Year: 1892

page_text: Date of Application, 13th Jan., 1892
Complete Specification Left, 5th Feb., 1892-Accepted, 2nd Apr., 1892
PROVISIONAL SPECIFICATION.
Improved Rock Drilling Machine.
I, RUDOLF MEYER of Mülheim on the Ruhr, in the Kingdom of Prussia,
German Empire, Manufacturer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to an improved construction of percussive rock drilling
machine actuated by fluid pressure in which the distribution of the motive fluid is
automatically effected by the working piston as I will now proceed to describe by
aid of the accompanying drawings in which,
Fig. 1 is a longitudinal section and Fig. 2 a transverse section of my improved
rock drilling machine.
The drill
u is the motor cylinder formed with an annular supply passage b for motive fluid
extending around the piston, and with suitable air exhaust openings c arranged in the
cylinder wall. Within this cylinder works a balanced piston d in which are formed
passages 1 leading to the space at one end of or above the piston, and passages 2
leading to the space at the other end of or below the piston, the said passages 1
and 2 being alternately and symmetrically arranged as shown in Fig. 2.
is attached to the outer end of the piston rod of the piston d. During the
reciprocating motion of the piston the passages 1 alternately open and close com-
munication between the space above or at the rear end of the piston and the
supply passage b, the piston itself controlling the exhaust from the space above
the piston through the passage c; and the passages 2 alternately open and close
communication between the lower or front end of the piston and the supply
passage and the exhaust openings c, so that the motive fluid for actuating the
piston is allowed free entrance into the cylinder and, after operating the piston, free
exit to the atmosphere.
In consequence of this, and owing to the fact that the use of separate distributing
mechanisin is avoided, greater efficiency is obtained than has heretofore been usual
in drilling machines.
A rifled bar e which fits in a suitable recess in the piston, automatically effects
the gradual rotation of the drill or tool during drilling by means of a ratchet wheel
and pawls.
Should jamming of the drill occur in consequence of the automatic rotating
mechanism of the same becoming hindered or interrupted by accumulation of drill
dust in the drill holes, or by the drill striking into fissured rock, the necessary
rotation of the drill can be effected by the operator by means of a handle secured
to the end of the rifled bar e which extends through the end cover of the machine.
Deted this 19th dov of Janne 1802
R. MEYER,
By L. W., per F. B.
COMPLETE SPECIFICATION.
Improved Rock Drilling Machine.
I, RUDOLF MEYER of Mülheim on the Ruhr, in the Kingdom of Prussia,
German Empire, Manufacturer, do hereby declare the nature of this invention and
in what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
This invention relates to an improved construction of percussive rock drilling
machine actuated by fluid pressure in which the distribution of the motive fluid is

page_text: automatically effected by the working piston as I will now proceed to describe by
aid of the drawings left with my Provisional Specification wherein
Fig. 1 is a longitudinal section and Fig. 2 a transverse section of my improved
rock drilling machine.
a is the motor cylinder formed with an annular supply passage for motive fluid
extending around the piston, and with suitable air exhaust openings e arranged in
the cylinder wall. Within this cylinder works a balanced piston d in which are
formed passages 1 leading to the, space at one end of or above the piston, and
passages 2 leading to the space at the other end of or below the piston, the said
passages and 2 being alternately and symmetrically arranged as shown in Fig. 2.
The drill is attached to the outer end of the piston rod of the piston d. During
the reciprocating motion of the piston the passages 1 alternately open and close
.communication between the space above or at the rear end of the piston, and the
supply passage b, the piston itself controlling the exhaust from the space above
the piston through the passages c; and the passages 2 alternately open and close
communication between the lower or front end of the piston and the supply
passage band the exhaust openings, so that the motive fluid for actuating the
piston is allowed free entrance into the cylinder and, after operating the piston, free
exit to the atmosphere.
In consequence. of this, and owing to the fact that the use of separate
distributing mechanism is avoided, greater efficiency obtained than has heretofore
been usual in drilling machines.
A rifled bar e which fits in a suitable recess in the piston, automatically effects
the gradual rotation of the drill or tool during drilling by means of a ratchet wheel
and pawls.
Should jamming of the drill occur in consequence of the automatic rotating
. mechanism of the same becoming hindered or interrupted by accumulation of drill
dust in the drill holes, or by the drill striking into fissured rock, the necessary
rotation of the drill can be effected by the operator by means of a handle f secured
to the end of the rifled bar e which extends through the end cover of the machine.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is
A percussive rock drilling machine in which the motor cylinder a is constructed
with an annular supply passage 6 for motive fluid and with exhaust openings cand
the piston which effects the distribution of motive fluid is formed with alternately
and symmetrically arranged inlet and outlet passages 1 and 2 substantially as
described, and shewn for the purpose specified.
Dated this 5th day of February 1892.
R. MEYER,
By L. W., per F. B.