Year: 1897

page_text: Date of Application, 23rd June,
1897
Complete Specification Left, 22nd Mar., 1898-Accepted, 23rd Apr.,
1898
I, EDWARD JAMES RULE, of Chariot Terrace, Illogan Highway, near Redruth, in
the County of Cornwall, Engineer, do hereby declare the nature of this invention to
be as follows:-
My invention relates to rock drills of the kind wherein the distributing valve is
operated by a ball or protuberance on the piston rod through the medium of a rocker
or rocking lever against which the said ball or protuberance acts.
In using a drill of this kind the points upon the rocker against which the ball or
protuberance impinges gradually become worn to such an extent that the valve does
not receive sufficient traverse to properly uncover the ports thereby necessitating
either the repair of the rocker or the substitution of a new one, and this operation
usually entails a considerable loss of time especially when the drill has to be
drawn out of a mine.
The object of my invention is to so construct the rocker that the repair or renewal
thereof is less frequently necessary than heretofore and to this end I construct the
rocker of approximately the shape of an equilateral triangle the said rocker at each
angle being provided with a claw or stirrup for engaging with a lug or projection
upon the valve and being mounted centrally so that either of the said claws may be
engaged with the said lug. The sides of the rocker are hollowed out or otherwise
suitably formed in order that the ball may operate against the rocker to oscillate it.
With this arrangement it is to be understood that when the points against which the
ball impinges become worn it is only necessary to take off the cover of the valve chest
and to move the rocker a third of a revolution in order to cause another claw to
engage with the projection on the valve and to bring fresh surfaces into position for
operation by the ball. It will thus be seen that the life of the rocker is threefold as
compared with the life of a rocker of ordinary construction.
Deted the 23rd day of June 1897
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in Kock Drums.
I, EDWARD JAMES RULE, of Chariot Terrace, Illogan Highway, near Redruth, in
the County of Cornwall, Engineer, 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:-
My invention relates to rock drills of the kind wherein the distributing valve is

page_text: operated by a ball or protuberance on the piston rod through the medium of a rocker
or rocking lever against which the said ball or protuberance acts.
In using a drill of this kind the points upon the rocker against which the ball or
protuberance impinges gradually become worn to such an extent that the valve does
not receive sufficient traverse to properly uncover the ports thereby necessitating
either the repair of the rocker or the substitution of a new one, and this operation
usually entails a considerable loss of time especially when the drill has to be
drawn out of a mine.
The object of my invention is to so construct the rocker that the repair or renewal
thereof is less frequently necessary than heretofore and to this end I construct the
rocker of approximately the shape of an equilateral triangle the said rocker at each
angle being provided with a claw or stirrup for engaging with a lug or projection
upon the valve and being mounted centrally so that either of the said claws may be
engaged with the said lug. The sides of the rocker are hollowed out or otherwise
suitably formed in order that the ball' may operate against the rocker to oscillate it.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which:-
Figure 1 is a longitudinal section of so much of a rock drill as is necessary to
illustrate my invention; and,
Figure 2 is a section on the line 2-2 of Figure 1.
a is the cylinder of the rock drill, 6 is the piston sliding therein and having the
valve operating ball or protuberance c upon it, d is the distributing valve and e is the
rocker by means of which the said valve is operated, the said rocker, as herein before
stated, being of equilateral shape and being centrally mounted upon the pivot f so
that all the angles of the rocker are equidistant from the axis.
9, 9 are the claws formed at the angles of the rocker and each of which is adapted
to engage with the lug.h on the valve.
i is the cover of the valve chest, and j, jare the bolts for securing the same.
With the arrangement herein before described it will be understood that when the
points of the rocker e against which the protuberance e impinges become worn or
when the claw g in engagement with the lug h becomes worn it is only necessary to
take off the cover of the valve chest and to move the rocker in order to engage
another claw g with the lug h of the valve and so bring fresh surfaces into position
for operation by the ball c. It will thus be seen that the life of the rocker is three-
fold as compared with the life of a rocker of ordinary construction.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed; I declare that what I claim is :-
1. In a rock drill a rocker of approximately triangular shape having a claw at each
of its angles, each claw being adapted for engagement with the distributing valve,
substantially as described.
2. The improvements in rock drills, substantially as herein before described and
illustrated in the accompanying drawing.
Datedth: 00-1 h 1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.