Improvements connected with Rock Drills.
Year: 1892

page_text: Date of Application, 16th Dec., 1892
Complete Specification Left, 5th July, 1893-Accepted, 19th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements connected with Rock Drills.
I EDWARD JAMES RULE now of Chariot Terrace, Illogan Highway, near
Redruth Cornwall Engineer do hereby declare the nature of this invention to be as
follows:-
This invention relates to certain improvements to the invention described in the
Specification of the Letters Patent granted to me bearing date September 8, 1891
and No. 15198.
This invention relates firstly to an improved form of clutch cone or drill holder
to attach the drill to the piston rod. Secondly to an improved construction of
spring washer packing for the forward end of the piston rod to pass through which
also acts as a buffer for the front piston. Thirdly, the use of a spring pressure
upon the slide valves. Fourthly to an improved form of holding clip to attach the
drill by. The clutch cone or drill holder is a kind of sleeve internally and
differentially tapered for a portion of its inside the larger end fitting on front of
piston rod and the other end for the drill to fit in. This holder has a transverse
rectangular shaped hole for a cross cotter which secures or holds drill and piston rod.
The washer is preferred to be made of layers of leather slit and placed in pairs one
on another to from substance enough for the retention of a spring preferably
formed of a wire ring. The spring presses the leather uniformly to the rod and so
keeps it tight. This packing has the further advantage of acting as a buffer for
the front piston. A bearing face is arranged to be pressed upon top of slide valve
by spiral spring to keep valve tight upon face at all positions of drill. The face
is preferred to be attached to a cup or tube upon the bottom of which the spring
bears. The clip is an arrangement of two frustrum cones made to fit one in the
other and tightened by a small piece of metal with tapered front pressed down by
bolt and nut; this enables the drill to be readily fixed to its holder or removed.
Dated this 16th day of December 1892.
FREDERIC PRINCE,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements connected with Rock Drills.
I EDWARD JAMES RULE now of Chariot Terrace Illogan Highway near
Redruth, 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 ascer-
tained in and by the following statement :-
This invention relates to certain improvements in rock drills of the kind
described in the Specification of Patent granted to me bearing date September 8th
1891 No. 15198 and refers firstly to an improved form of cuff or drill holder which
has a cone end to attach the drill bit to the piston rod. Secondly to an improved
construction of spring washer packing for the forward end of the piston rod to
pass through which also acts as a buffer for the front piston. Thirdly the use of a
spring pressure upon
the slide valves. Fourthly, to an improved form of clip to
connect the drill by.
To enable my invention to be properly understood I will proceed to describe the
same with aid of the accompanying drawings.
Figure 1 is a sectional side elevation of my improved drill embodying the above
improvements.

page_text: Figure 2 sectional view of drill holder on end of piston rod.
Figure 3 detached sectional view of drill holder.
Figure 4 plan view of connecting clip on line a. y. Fig. 1.
Figures 5 and 6 plan and section of spring washer packing.
The fluid pressure is admitted into the cylinder either through the short ports
described the Specification of my Patent No. 15198-1891 or through curved
ports at each end of the cylinder as shown in the present drawings: the exhaust is
carried through the side of the machine similarly as is described in my aforesaid
former Patent, the slide valves being worked as before described. According to
this present invention the valves are held down by a bearing piece A preferably
made with a stem part B, tubular as shown, to enclose a spiral spring C, to press
down the face of bearing piece on top of valve, suitable recesses D, being provided
in the cover E, to accommodate the stem B, and retain spring. The drill
holder F, is a solid piece of metal made to size and each end bored with a
tapered hole, one to fit drill rod, and other, end of piston rod. A transverse
rectangular shaped cotter hole F, is made through the middle. A drill holder
made in this way gives additional facility for removal, and also saves renewals of
the end of piston rod. G the improved packing washer. This is composed of
several pieces of leather cut in disc shape with hole through to fit packing box and
piston rod. The edges of the pieces are recessed or grooved so that when two discs
are placed together a wire spring H can be embedded; this spring presses the
leather uniformly upon the rod and keeps it tight. The packing box is packed
with these discs several of which may be secured together by sewing or otherwise.
The advantages of the packing is it lasts longer than any other packing, it does
not cut the rod, it does not get loose, and it forms a good buffer for front end of
piston. The improved clip I, is an arrangement of two fustrum cones made to fit
the one in the other and secured to drill as by dovetail bearing and tightened by
piece J drawn together by bolt and nut K. This arrangement of connection for
adjusting drill offers great facility for removal, and can be readily tightened
up in use.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare the what I
claim is :-
In rock drills
1. The spring pressure upon top of slide valve arranged to act in the manner
described and illustrated by the accompanying drawings.
2. The shape and construction of the drill holder Fas described and illustrated
in the drawings at Figures 2 and 3.
3. The improved spring packing constructed substantially as described and
illustrated by the accompanying drawings at Figures 1, 5 and 6.
4. The improved arrangement of adjusting clip and tightening same as constructed
and used substantially as described and illustrated in the drawings at Figures 1
and 4.
Dated this 5th day of July 1893.
FREDERIC PRINCE,
1, Quality Court, Chancery Lane, London, W.C., Agent for Applicant.