Improvements in Rock Drills and the like.
Year: 1899

page_text: Date of Application, 27th Sept., 1899
Complete Specification Left, 27th June, 1900-Accepted, 22nd Sept., 1900
PROVISIONAL SPECIFICATION.
Improvements in Rock Drills and the like.
We, WILLIAM DAVID JONES, Quarry Manager, of Brunditt's Granite Quarries,
WILLIAM OWEN PIERCE, Engineer, of 12, Crimea Terrace, both of Penmaenmawr,
North Wales, and WILLIAM MAINE TREGLOWN, of 114A, Queen Victoria Street,
London, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention refers to rock-drills and like tools in which the cutting is
effected by a succession of blows on the head of the cutting tool, the motive
power being supplied by steam, or water or air under pressure.
The cutting tool needs to be rotated when in use and this has hitherto been
done by the hand of the operator. In this invention the rotating device turns
the tool automatically, and thus greatly increases the efficiency of the drill.
Our rotating device can be operated by the exhaust from the drill or direct
from the power supply..
In carrying out our invention, we place a strong metal sleeve over the lower
end of the barrel of the drill, and beyond this sleeve we attach to the barrel
a small motor of any suitable kind to which we convey the power. Attached
to this motor are geared wheels which drive a worm placed transverse to the
drill barrel. This worm engages with teeth on the sleeve and causes it to
rotate, and thereby turn automatically the socket or tool holder and the tool
itself.
In order to give a jumping movement to the tool as it rotates, we attach
two spring pawls to the said sleeve and cause them to engage with two lugs on
the mouth of the tool holder.
D
1
7
ea
1
1000
S. S. BROMHEAD,
Agent for Applicants, 33, Cannon Street, London, E.C.
Improvements in Rock Drills and the like.
We, WILLIAM DAVID JONES, Quarry Manager, of Brunditt's Granite Quarries,
WILLIAM OWEN PIERCE, Engineer, of 12, Crimea Terrace, both of Penmaenmawr,
North Wales, and WILLIAM MAINE TREGLOWN, Engineer, of 114A, Queen Victoria
Street, London, E.C., 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 pneumatic hammers and other automatic percussive
tools, in which the cutting operation is effected by a succession of blows, and

page_text: has for its object to render such tools applicable for use as drills. and more
especially for use in drilling or boring rock and stone.
In such pneumatic hammers and similar tools as usually employed, the
cutting tool is loosely fitted at the end of a cylinder, within which a free piston
slides, which, upon the admission of fluid pressure, is forced against the head of
the cutting tool inwardly projecting within the cylinder, the piston being auto-
matically retracted and again forced upon the inwardly projecting head of the
tool, thereby effecting a succession of blows upon the tool, whereby the cutting
or other operation is automatically effected.
The invention consists in providing means for the automatic rotation of the
cutting tool in such pneumatic hammers and similar automatic percussive
tools, whereby a combined rotary and percussive action is automatically given
to the cutting tool or bit, which is thereby rendered conveniently applicable
for drilling or boring.
The means for rotating the tool are operated preferably by the exhaust from
the cylinder, or direct from the power supply; compressed air being the motive
power that is preferably employed.
The invention is illustrated in the accompanying drawings, in which
Fig. 1 represents in partial longitudinal section an automatic hand hammer
or drill in which the invention is embodied.
Fig. 2 is an elevation corresponding thereto, and
Fig. 3 is a transverse vertical section on the line X-Y Fig. 2.
The drawings represent one convenient arrangement in which the invention
can be carried into effect, as applicable to a pneumatic hammer or tool.
In carrying the invention into effect, as illustrated in the drawings, A is the
cutting tool or bit, which is preferably secured to a shank B by means of a
clamping collar C, whereby various cutting bits are capable of being employed.
The shank B has a short and determined longitudinal movement whereby the
percussion of the sliding piston D may be taken up. The shank B projects
within the cylinder E of the hammer or tool, and slides within a sleeve F pro-
vided in the extremity thereof. The shank B is preferably formed of square
section at the part b, and a toothed sleeve or worm wheel G is mounted upon
the shank at that part so that the worm wheel and shank rotate together."
A sleeve H is fixedly clamped in position to the end of the cylinder E by
means of bolts J. This sleeve is provided with a transverse boss h within which
is carried a spindle K. Upon this spindle is mounted a worm L which gears
with the toothed sleeve or worm wheel G.
The sleeve H serves to carry a cap M mounted upon the shank B, within which
slides a damping or elastic ring N to contact with a flange B¹, provided upon
the shank. A ring n or other elastic element is provided between the ring N
and the cap M, so that the tool may rebound or jump at each stroke of the piston
on contact of the flange B¹ with the ring N.
A casing O is fitted upon the sleeve H, and carries within it the vane wheels R,
by means of which the rotation of the cutting tool or of the shank B is effected.
The casing 0 is screwed to the sleeve H by means of the screwed boss o, and
the spindle K passes therethrough and carries the worm L before referred to,
the opposite extremity of the spindle K being carried within a screwed sleeve Q
screwed within the lower part of the boss h.
One vane wheel R is keyed to the spindle K and gears with another secured
upon the spindle K¹. A plate or cover S is secured to the casing, and the casing
is fixedly mounted in position upon the sleeve by means of the pin o¹. The
compressed air or other motive fluid is led into the motor casing 0 by the
flexible pipe T, and passes out through a series of exhaust ports Ü¹ upon the
other side of the casing O.
The flexible pipe T is preferably connected with the exhaust port of the
cylinder E, or it may be secured to the main supply.
A relief valve V may be provided for the purpose of arresting the rotation
of the tool when required, or other means for the same purpose may be provided,

page_text: In the operation of the tool it will be understood that a continuous percussive
action is given to the shank B, which is in turn communicated to the tool;
meanwhile the shank and tool are caused to rotate to a degree dependent upon
the ratio of the gearing employed, and of the power supply to the rotating
device.
It will be of course understood that the invention is applicable to hammers.or
tools which are operated by steam, water, or compressed air, and that any other
automatic means of rotating the cutting tool than those described may be
employed, as for example, a single vane wheel, which may either be fixed on to
the shank or cutting tool, or communicate motion thereto through a worm
and worm wheel, or other gear in the manner substantially as herein before
described.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is: --
1. In pneumatic hammers and other automatic percussive tools, means for
the automatic rotation of the cutting tool or bit, for the purpose and substan-
tially as herein before described.
2. In pneumatic hammers and other automatic percussive tools, means for
effecting the rotation of the cutting tool or bit, consisting of a vane wheel or
wheels, communicating motion through gear to the cutting tool, and operated
by fluid pressure in the manner and for the purpose herein before described.
3. A drill or tool constructed and operating in the manner and for the pur-
pose hereinbefore described.
EDWARD EVANS & Co.,
Chartered Patent Agents,
Lonsdale Chambers, 27, Chancery Lane, London, W.C., and
105, Colmore Row, Birmingham, Agents for the Applicants.