Improvements in Rock-Drills..
Year: 1891

page_text: Date of Application, 8th Sept., 1891
Complete-Specification Left, 8th June, 1892-Accepted, 9th July, .1892"
PROVISIONAL SPECIFICATION.
Improvements in Rock-Drills..
I, EDWARD JAMES RULE, of Esler Street, California Gully;-Bendigo, Victoria,
Blacksmith, do hereby declare the nature of this invention-to-be as follows
This invention relates to the valves used for admitting air into the cylinders of
rock drills, and to the means employed for operating said valves, its object is to
increase the efficiency of rock drills, by bringing the main body of compressed air
closer to the piston, and by saving an ordinary port full of compressed air at each
stroke.
According to this invention over each port is fitted a slide-valve, connected by a
rod with a central -saddle-piece, having a small downwardly projection boss, fitted
into a cup or recess in the upper end of an operating rocker, this latter is formed
with three arms, and is preferably made of an approximately triangular piece of
metal, and is adapted to be operated, by a spherical projection the piston rod,
coming into contact with either end alternately, of the base, or lower arms of the
rocker, which is mounted in bearings upon the cylinder of the machine, and its base
or lower arms are arranged to project through a slot in said cylinder, so that when
the drill is operated in one direction, the spherical projecture on the piston rod to
which it is attached, will make contact with one end of the base, (or with the lower
arm of the said rocker) and will move same in such a manner as to reverse the
positions of the valves, which are connected with the saddle-piece in engagement
with the upper end of rocker, the effect will to reverse the drill as will be well
understood with this construction of rock drill. By the above described means I
am enabled to bring the main body of compressed air, closer to the piston operating
said drill, and moreover I save the air contained in ordinary port or passages, and
which now escapes into the atmosphere and is wasted.
Dated this 8th day of September 1891.
FREDERIC PRINCE,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Rock Drills.
I EDWARD JAMES RULE, of Esler Street, California Gully, Bendigo, Victoria,
Blacksmith, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described in and by the following
statement:-
This invention relates to an improved placing of the valves used for admitting air
into the cylinder of rock drills also to the means employed for operating said valves
the object being to increase the efficiency of rock drills by economising compressed
air by saving an ordinary port full at each stroke.
To enable my invention to be properly understood I will proceed to describe the
same by aid of the accompanying drawings being sectional elevations of the drill
shewing the pistons and valves in different positions.
A is the cylinder having an opening B; C and C¹, the pistons securedin rod D;
pivotted to the cylinder in the opening B, is a triangular shaped roser E, for
actuating the slide valves. This rocker is operated by the spherical oss F, on
rod D, the incline sides of which prevent positive blows being given to the ends of
rocker E. The top F¹, of rocker engages a saddle piece G, connected to the
valves H. These are placed at the ends of the cylinder so that the inlet ports are

page_text: only the length of the thickness of the metal; by this means economy of air is saved
in working. J, cover for air box; K packing rings for piston rod D.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
"
The manner of placing and actuating valves of rock drills herein before described
and illustrated by the accompanying drawings.
Dated this 8th day of June 1892.
FREDERIC PRINCE,
1, Quality Court, Chancery Lane, London, Agent for Applicant.