1352
THE NEW ZEALAND GAZETTE.
[No. 63

reciprocate and turn on said tube, and the hollow drill-bit
surrounding the discharging-end of said tube, substantially
as described. (37.) In a rock-drilling engine, the combina-
tion with the back cylinder-head, of the water-inlet coupling
rotatively mounted thereon, the washer at its sides, and the
tightening-nut, substantially as described. (38.) In a rock-
drilling engine, the combination with the cylinder, of the
piston, the hollow drill-bit, the rifle-bar and the water-inlet
tube projecting through said rifle-bar and piston into said
drill-bit, with the back cylinder-head, the water-inlet passage
therein, the water-inlet coupling, and the valve for con-
trolling said water-inlet passage, substantially as described.
(39.) In a rock-drilling engine, the combination of the cylin-
der, the piston, the rifle-bar and the pawls, with the
supplementary cylinder-head and back cylinder-head, the
pawl trunnion supporting-ring, a water-inlet tube, a
threaded hole in said cylinder and into said supplement-
ary cylinder-head, a cap-screw in said threaded hole, and
an oil-hole leading from said cap-screw hole to said
pawls and rifle-bar, substantially as described. (40.) In
a rock-drilling engine, the combination of a drill-bit
having a passage to its cutting-point, a water- or liquid-
conduit through said engine to said drill-bit, means for
introducing a portion of the engine's actuating-fluid into
said water-conduit or to said drill-bit, and for delivering a
combined and commingled spray, stream, or jet of actuating-
fluid and water from said drilling-engine and drill-bit to the
bottom of holes while drilling them, substantially as de-
scribed. (41.) In a rock-drilling engine, the combination of
the cylinder and the piston with the front cylinder-head,
having a drill-holding chuck rotably mounted therein, and
arranged to be turned step by step by said piston, a drill-bit
operatively supported by said chuck and arranged to conduct
a portion of the cylinder's actuating-fluid and a stream of
water from the engine's cylinder to its cutting-point, a
chuck-sleeve surrounding said chuck, a collar on said chuck-
sleeve, a ring mounted on said collar, a spring between said
ring, and an abutment in said cylinder-head, and means
whereby the ring may be moved by the collar of said chuck-
sleeve to compress said spring, substantially as described.
(42.) In a rock-drilling engine, the combination of the
cylinder, the piston, and the front cylinder-head, a rock-
cutting drill-bit having projections near the end of its shank,
a drill-bit supporting-mechanism consisting of a chuck com-
prising a cylindrical tube containing two oppositely arranged
slots in its forward end, a fluted axial hole in its opposite
end, a hammer-bar extension to said piston, a fluted portion
at its end fitting loosely in said fluted end of said chuck,
projections on said chuck, means for rotably supporting said
chuck in said cylinder-head, a chuck-sleeve surrounding
freely said chuck, stops on said chuck-sleeve arranged to
engage said projections of said chuck, an end-flange ex-
tending over the end of said chuck, and an oblong hole
axially through the flanged end of said sleeve-chuck, adapted
to fit loosely said drill-shank and lugs, substantially as de-
scribed. (43.) In a rock-drilling engine, the combination of
the cylinder, the piston, the front and rear cylinder-heads, the
rifle-bar rotating-mechanism and the feed-mechanism, with
a water-conveying tube projecting from the rear cylinder-head
through said rifle-bar and piston, a drill-holding chuck and
chuck-sleeve, revolubly mounted in said cylinder-head, an
axial bore through said sleeve and chuck, a drill-bit opera-
tively supported by said sleeve and chuck, and arranged
to be operatively rotated step by step by said piston and
chuck, and provided with a conduit or passage communi-
cating with said cylinder and with the discharge-end of
said water-conveying tube, and arranged and adapted to
convey a combined and commingled stream of water and
actuating-fluid to the cutting-point of said drill-bit, and
having said drill-bit project into the reciprocal path of said
piston and arranged to be impinged by said piston, a collet
loosely mounted on said chuck-sleeve, a ring mounted on
said collet, a spring arranged between said ring and an
abutment in said cylinder-head, substantially as described.
(44.) In a rock-drilling engine, the combination of the
cylinder and the front cylinder-head, of a piston in said
cylinder having an extended bar adapted to strike on the
shank-end of a rock-cutting drill-bit and a series of flutes
cut around said bar, a drill-holding chuck mounted loosely
on the fluted portion of said bar, a rock-cutting drill-bit,
means for removably securing said drill-bit to said chuck,
and means for rotating said piston and chuck and rock-
cutting drill-bit, substantially as described. (45.) In a rock-
drilling engine, the combination of the cylinder and the
front cylinder-head with a rock-cutting drill-bit, a drill-
holding chuck arranged to hold the drill loosely and in such
a manner that it can be instantly inserted or removed from
said chuck manually, a piston in said cylinder having a
hammer-bar extension adapted to strike the shank-end of
said drill-bit, means for rotating said piston step by step,
and means for rotating said drill-bit step by step from said
piston, substantially as described. (46.) In a rock-drilling
engine, the combination of the cylinder and the cylinder-

head with the manually-operating drill-bit-holding chuck,
a piston having a hammer-bar extension, cupped washers
mounted on said hammer-bar, a ring between said cupped
washers, a ring on the outside of each cupped washer, a
rubber buffer-ring at the side of one ring, and means for
compressing the cupped washers around said hammer-bar,
substantially as described. (47.) In a rock-drilling engine,
the combination of the cylinder and the drill-bit manually-
operating chuck, the piston arranged to strike said drill-bit,
means for rotating said piston and drill-bit, and means,
including a spring, for cushioning the blow of the piston on
the drill-bit when the drill-bit is out of cutting relation to
rock, substantially as described. (48.) In a rock-drilling
engine, the combination with the cylinder, the piston, and
the front cylinder-head, of the hollow drill-bit, and the
drill-chuck and sleeve, means including a rifle-bar for
rotating said drill-bit step by step, means including a hand-
operating device for securing said drill-bit instantly to
or for removing it instantly from said drill-holding chuck,
means including a spring for cushioning the spent blow of
the piston against said drill-bit, means including a water-
conveying tube and a water-supply system under pressure
for delivering a supply of water into said drill-bit, means
including air-passages for delivering a suitable supply of
actuating-fluid into the water and in said drill-bit, means
including packing-rings for keeping the water out of said
cylinder, and means for operating and oiling the moving
parts of said drilling-engine, substantially as described.
(49.) In a rock-drilling engine, the combination with the
cylinder, the piston and its extending hammer-bar, the rifle-
bar and pawls, and valved water-conveying tube, the water-
inlet coupling, the cylinder-head and the drill-holding-chuck
members arranged to be rotated by said chuck-mechanism;
the valve-controlled actuating-fluid passages leading to said
hollow drill-bit, the buffer-ring and the cupped washers and
their supporting-rings surrounding said hammer-bar, sub-
stantially as described. (50.) In a rock-drilling engine, the
combination with the cylinder and the piston, of the front
cylinder-head, the drill-holding chuck and chuck-sleeve, the
drill-bit having the projecting lugs, the slots in the chuck in
which said lugs are confined, and the end-flange on the
chuck-sleeve for confining the lugs to the slots of the chuck,
substantially as described. (51.) In a rock-drilling engine,
the combination of an operative cylinder, an operative valve-
mechanism, a piston arranged to rotate step by step as it
reciprocates in said cylinder, and a suitable feed-mechanism,
with a drill-bit loosely and unclampably supported ope-
ratively by said drilling-engine, and arranged to be impinged
against by said piston, and adapted to be rotated step by
step by said piston, and containing a passage throughout
its length, passages controlled by an automatically-operating
valve arranged to convey a portion of the piston's actuating-
fluid into said drill-bit, a valved water-conveying tube ex-
tending through said piston, means for providing a supply of
water under pressure to said tube, and communicating with
the passage in said drill-bit, and means for excluding the
water from said cylinder, substantially as described.
(52.) In a rock-drilling engine, the combination with the
valve-chests, the valve, and the cylinder, of the piston
having a circumferential groove centrally of its length, actu-
ating-fluid ports leading from said valve-chest to the ends
of said cylinder, open passages leading from the main
air-inlet port of said valve to its opposite ends, ports
or passages leading from the opposite ends of said
valve-chest to a position in the cylinder where they will
register with the said annular groove in said piston during
its reciprocative movements, and having the port contain
independent passages placed at a short distance apart, and
means for closing the passages nearest the centre of the
cylinder, and ports leading from the path of travel of
the central part of said piston to the atmosphere, substan-
tially as described. (53.) In a rock-drilling engine, the com-
bination with the valve-chest and valve and the cylinder, of
ports arranged to co-operate with the reciprocal movements
of the piston, and with a circumferential port therein to
automatically operate and cushion the piston, and means
comprising two separated outlets leading into said cylinder
from the front port of said cylinder, a pin for closing the port
nearest the centre of the cylinder, and a hole in the cylinder
in which to keep the pin when in disuse, whereby the open-
ing of the valve in the forward or striking-blow end of the
piston is retarded and a harder blow is struck, substantially
as described. (54.) In a rock-drilling engine, the combina-
tion of the valve-chest, the valve, the cylinder, and the
piston, of a circumferential groove around the piston slightly
nearer its forward or drill-striking end, ports leading from
said valve-chest into said cylinder, and from said cylinder to
the atmosphere, and arranged to automatically operate the
valve and piston, and means comprising two independent
and separate outlets for the port leading into the front end
of the cylinder, and means at the control of the operator for
closing the outlet of these two outlets of this port that is
positioned nearest to the centre of the cylinder, whereby two