US922526A - Water-feed, dust-laying, rock-drilling engine. - Google Patents

Description

G. H. SHAW. WATER FEED, DUST LAYING, BOOK DRILLING ENGINE.

APPLICATION FILED SEPT. 19, 1904.

O. H. SHAW.

WATER FEED, DUST LAYING, ROCK DRILLING ENGINE.

APPLICATION FILED SEPT'.19,1904.

Patented May 25, 1909.

3 SHEETSSHEET 2.

E Wan m ERK l-lll G. H. SHAW. WATER IEED, DUST LAYING,.ROGK DRILLING ENGINE.

APPLICATION FILED SEPT. 19, 1904.

Patented May 25, 1909.

BSHEETS-SHEET 3.

I CHARLES H. SHAW, OF DENVER, COLORADO,

WATER-FEED, DUST-LAYING, ROCK-DRILLING ENGINE.

Specification of Letters Patent.

Patented May 25, 1909.

Application filed September 19, 1904. Serial No. 225,147.

To all-whom it may concern:

Be it known that I, CHARLES H. SHAW, citi-'- zen of the United States of America, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Water-Feed, Dust- Layin ,Rock-Drilling Engines; and I do declare t e following to be a. full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference eing had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form apart of this specification.

My" ventionl relates to improvements in water feed dust laying rock drilling engines, and the objects of my invention are: First, to provide a rock drilling engine that will lay the rock dust as it emerges from the holes in rock as they are being drilled. Second, to provide means for delivering a mist of water under pressure against the rock, or around the edge of holes in rock, While drilling them. Third, to provide means for su plying water under pressure to pneumatic llammer rock drills, and for discharging the water from the front end of the pneumatic hammer rock dust as it flows from the ho drilling engine in a watery mist or in a lurality of jets or sprays against the su ace of rock in tunnels, shafts, stopes and driftsof mines, at or adjacent to or around the edges of holes in rock while drilling them, for the purpose of laying or wettin down the rock l es while drilling them. Fourth, to provide means for storin a su ply of water and for discharging said supp y of water from the drill holding end of pneumatic hammers, and pneumatic hammer rock drilling engines in a circular shower of atomized mist, spray or jets. Fifth, to provide means for introducing either air or water into the rock cutting drill bit, independent of and entirely outside of the cylin-' der of the rock drilling engine. I attain these objects by the mechanism illustrated in the accompanying drawings, in which:'

Figure 1, designates a side view of a pneumatic hammer rock drilling engine and water supply apparatus embodying my invention. Fig. 2 is a vertical longitudinal sectional-view of the rock drilling engine shown in Fig. 1; the" stop ing bar and the clamp shown in Fig.

- 1, being eft outofthis view. Fig. 3 is a sec tional view oil-the line 6--6 of Fig. 2. Fig.. 4 is a side view partly .in section of the rock drilling engine, arranged to be manipulated" by hand. Fig. 5 is a detail plan view of the cylinder cap and a portion of the cylinder. Fig. 6 is a side view of the cap locking pin. Fig. 7 is an enlarged fragmentary sectional view of the front end of the cylinder showing the air passage, the water chamber and the mist spraying valve. Fig. 8 is a pers ective view of the front end portion of the orm of drilling engine illustrated in Figs. 1, 2, and 7, showing the manner in which the water is thrown in a spra or mist around the hole being drilled. Fig. 9 is a sectional viewof the drillbit used with this present form of drilling engine. Fig. 10 is a front elevation of the mist or spray making'valve.

Similar characters of reference refer to similar parts throughout the several views.

Referring to the drawings: The numeral 1,-

designates the cylinder of my improved pneumatic hammer dust laying rock drilling engine, and 2, the hammer piston. The cylin-' 2, which is also made in two diameters, is

reciprocally mounted, the larger diameter of the cylinder is at its rear end and in the inner,

periphery of the bore of the cylinder close to this end, a circumferential chamber or-port 5, is formed. Adjacent to this chamber a sec- 0nd circumferential chamber or formed, and at the junction of the arger and smaller diameters of the bore of the cylinder, an annular recess 7, is formed, that forms the air inlet port to the cylinder. A threaded aperture 8, is formed through the shell of the cylinder which receives a reducer 9, the interior of which is threaded to receive one end of a nipple 10, to the opposite end of which a valve 11,- is secured. A nipple 12, is secured at one end to the valve and a hose 13, ex-

ort 6, is"

tends to a tee 14, which is connected to a hose the shell of the cylin- In this end bore 19, a drill-holding collet 20, is driven tightly. The artition 18, is also provided with an axial ho e a little larger in diameter than the hole in the drill holding collet.

To the rear end of the cylinder of Figs. 1,

2, 3, and 4, I secure a cap or rear cylinder.

tions, see Fig. 5. The centers of the square .ca fit' over the fiat square co ar, see Fig. 5. The peri ortions are flush and even with the circumerential surface of the cylinder, while the .end portions of the square and the curved. portions of the collar project a short'distance above the cylinder and form square shouldered abutments for the introverted end 2.4, of a nut-25, that is mounted loosely on the cylinder. This nut is of larger diameter than the cylinder and pro'ects forward. over the front end of the cylinder from the collar against which its introverted end abuts. The cap 22,- is provided with a cylindrical sleeve portion 26, that fits loosely over the end of the cylinder and its end is rovided'with four recesses 27, that fit over t e circumferential portions of the collar, while the four fin er. ends formed on the end of the sleeve of t e ortionsof the eral surface of this collar is threaded and t e nut is screwed onto it, thus drawing the cap tightly against of which is the end of the cylinder, while the square por-.

tions of the collar and cap prevent the cap from turning. An enlarged collar portion 28 is formed on the free end of the nut, the face rovided with a circumferential row of radia ratchet teeth, 29, and on the cap a boss 30 is formed, in which a spring controlled locking pin 31 is placed, one end of which is beveled, and is arranged to project into the ratchet teeth and lock the nut to the ca This locking pin device comprises a ho e 32, formed in the boss, 30, substantially parallel with the axis of the cylinder in the ottom of which a coiled expansive spring 33 is placed. The pin 31 is inserted loosely in the hole against the spring, which is'held in resilient engagement with the ratchet teeth bythe expansive tension of the spring. A recess 34 is formed in one side of the pin, and a stop pin 34 is inserted transversely through the boss and recess of the pin and secured the pin 31 in the hole. The pin is arranged to be moved back against the spring away from the ratchet teeth of the nut'and locked in that position of disuse by forming a recess 34, at

the front of the recess 34, and at right angles to it, and it is only necessary when the nut is to be unscrewed from the cap to push the pin back until the recess 34, registers opposite the stop pin, and then turn the pin quarter way around and bring the recess 34 ,1n contact with the stop pin which will hold it in its retracted or inoperative position. v

The iston hammer 2, is provided with a circum erential recess 35, in its outside periphery, at the junction of its two diameters, in order to rovide a shoulder 35*, of larger area ofsurf ce for the expansive fluid to act on, in moving the pistonhammer rearward. The expansive fluid acts against the shoulder in moving the valve rearward as will be explained more fully hereinafter. The iston hammer is also provided with an axia bore 36, of preferably three diameters, which extends into it from its rear end to near its front end. The largest diameter of the axial'bore of the valve is at its rear end, and the smallest is at its front end portion. Radially through the shell of the valve from its largest bore a plurality of port holes'37,

are formed. I also form a plurality of portholes 38, radially through the shell of the valve into the smallest diameter of its axial bore. "I preferably use four port holes at end, and the front end port holes 38, will register adjacent to the front edge of the annular inlet port 7 and position the circumferential recess 35 and the shoulder of the largest diameter of the valve at the junction of the two diameters at the front edge of the circumferential port 6, as shown. in Fig. 2, in which. osition of the piston the actuating fluid has 'een cut ofi from entrance from the port 7, into the interior of the piston through the port holes 38, and the piston hammer is being moved rearward away from the drill-bit as will be described more fully hereinafter.

In the drill holding collet I fit loosely, when the pneumatic hammer is to be used for drilling holes'in rock, the shank of a drill 'bit 40. This drill bit. is 'preferablv made of around bar of steel and is provided with an axialhole 41, which'extends only partially through the drill bit. The hammer striking mer striking end of the drill-bit "is prefer-,

end is solid and I preferably extend this ably made polygonal, and a collar 42 is formed on theround part of the s ankjad "acent to thehe'xagon end, and a breaded ole 41 is formed in the side of thedrill-bit into its axial hole. hole 41 in the collar 42, and to this threaded hole I connect a hardened steel reducing .23, the opposite end of which is. connected I preferably place this to one end of a piece of hose 13*that forms a branch of the air supply hose 13. The opposite end of the hose 13 is connected to a tee 13, that is connected in the hose 13.

The hose, 13 is provided with'a valve 13 as shown. The rock cutting end of the drill bit may be made in any way and may be tprovided with any number and with any ind of rock cutting lips; I preferably, how ever, upset the end to form a cutting head. The face of the head of this drill-bit is referably. made at right angles to the axis of the drill shank and is formed into a circular' row of tapering saw toothed cutting lips 43, which radiate from the edge of its axial aperture to the periphery of the head of the drillbit. The hammer striking end of the drill fits loosely in and extends through the hexagon hole of the drill holding collet until its collar strikes against the end of the collet and extends also through the partition 18 a short distance into the r'eci rocal path of the piston hammer" which stri es against it at each forward stroke. When the pneumatic hammer is to be used for stone carving for architectural work and sculpture, suitable chisels mustbe employed in place.v of the drill-bit and they may be made with or with- Gutaxial a ertures, as desired.

Y In the s ell of the cylinder close to its front end, and in the counterbore 19, I form a circumferential recess 21. This recess I term a water chamber. Thiswater chamber is closed to the bore of the cylinder and'to its exhaust port 16, 'by the drill-holding collet 20, which is driven tightly into the bore 19. An inlet aperture 21", is formed radially through the shell of the cylinder; This aperture is threaded and a hardened steel reducer 22 is threaded to it, that is adapted to receive in its largest diameter the threaded end of a nipple 23, which is secured to one end of a hose 24, the opposite end of which extends to and is connected to the topportion of a water supply tank 25".

In cases where it is not desired to. use water in the water chamber, but in the drill-bit only, the hose 24, maiy be disconnected from the water chamber and connected directly to the drill bit. generally, used in the rill-bit, and is conveyed to it through the branchhos e 13, which is connected to the air hose 13, at one end, and to the drill-bit at its opposite end, as shown. opening into the water chamber'21, I form an aperture 21, which extends into a nozzle chamber 21",..that is formed in .a projecting lug 21,that is formed integral with the front end of the cylinder. This nozzle chamber extends into the lug at an acute horizontalangleto the axis of the. cylinder that converges fromtherear end'of the lug toward the axial center of the cylinder. The degree ofthi's angle is such that if the seat aperture 21, at right angles to the port Com ressed air is most Opposite the aperture 21*,and

of the cylinder was projected forward, the

the cylinder to about opposite the air inlet port7, in Fig. 2, and to about opposite the pmction of the bores 3, and 4, of Fig. 7. In Fig.7, however, the inletport 7, as shown 'inFig. 2, is dispensed with. The cylinder shown in Fig. 7, represents the cylinder of thelargest size drilling engine, while the cylinder of Fig. 2, shows the arrangement of the smallest size. The diflerence is of no conse uence, as in Fig. 7, the port 7, of Fig. 2, is pensed with, and the port 3, of the cylinder in Fig. 7, acts as the air inlet port. From the junction of the bores 3, and 4,. of the cylinder, in Fi 7, and from the inlet port 7, in Fig. 2, l extend an air port 21 throu h the. lug 21 to the nozzle chamber the lug 21?, I form a tapering valve 21', and in this valve seat I rotatably secure a tapering plug valve 21*, which is provided with a port 21", that is arranged ,to register with the port 21 the large end of this valve is provided with a finger operating disk 21,

by which it may be rotated to 0 on or closethe port. In the chamber 21, fit a nozzle 21". While this nozzle may be secured in this chamber in any desired manner, I prefe erably fit it to press snugly into it, as it is improbable that it'will'have to be removed. I form an axial aperture 21, in the rear end of this nozzle, that connects with the rear.

end of the nozzle chamber and with the cylinder port 21 which extends into the nozzle to near its front end, and into the front end of the nozzle I drill a plurality of very small holes 21, which I arrange in a circle concentric to the axis of the nozzle, and drill them into the nozzle at a converging angle that will discharge the water from around 'the'nozzle in such amanner that at a distance of from a few inches to about, from fifteen to .twcnty-four inches, it will discharge the jets from the-holes as a spray or I mist around the drill bit and at short distance from it and from the hole being drilled in the rock, when the rock drilling engine is set at a ractical drilling distance fromv the rock, su stantially as shown in Fig. 8, in

which 40 designates the drill bit; 21 the spray or mist, and 2 1 the outline of a hole being-drilled. Two or more holes may be used if desired, but I preferably use four, and

arrange them as'shown in Fig. 10. I form a circumferential recess 21, around the central ortion of the nozzle, and position the nozz e in the chamber sothat this recess will register with the aperture 21", and from the bottom of this recess I drill two holes 21"",

entirely through the nozzle from diametri'c ally opposite sides of it, which intersect the axial aperture 21, and form four inlet apertures from the circumferential recess 21",

intothe axial port 21 The tank 25*, is made of a size that per- 5 mits it to be easily lifted and carried by one man, and is made small in diameter in order that it will not take up much room and will better fit in niches and at the side of the mine s supporting timbers, and is made long enough to hold several gallons of water.

The top of this tank is provided with a capped inlet 25. One end of a hose 27", is

connected to a nipple that is connected to the upper portions of the tank. The 0 posite end of the hose extends to a supp y of compressed air; a suitable valve 29, is

placed in the hose 27, adjacent 'to the tank to control theair pressure, and a suitable valve 30", is placed in the hose 24, to con trol the flow and pressure of the water to the -water chamber in the cylinder.

lVhere my improved pneumatic hammer dust all aying rock drill is to be held and guided by an operator, when drilling holes inrock in the same manner as pneumatic clipping and calking hammers are held, a handle 31, is formed on the cap, as shown in Fig. 4. My improved dust laying rock drilling engine comprises the-pneumatic hammer cylinder and the fluid pressure feed cylinder, which feeds the drill-bit automatically into i the rock as fast as it drills into it. The fluid pressure feed cylinder is apart of the pneumatic hammer cylinder and is rigidly 35 connected to it. v

In Figs. -1, and 2, a threaded 1 hole is formed in the cap 22, in which I screw one end of a pistonrod 45, whichis provided with .a nut-shaped collarportion this 4 collar is formed integral with the piston rod; the piston rod is screwed through a check -nut 45, until the collar bears against the' check nut and the check nut bearstightly against the cap.

4 The piston rod-45, is a long rod that is provided with a long piston head 48, which is a little larger in diameter than thepiston rod, and is fitted slidably ina long cylinder 47,

which I term the constant or fluid pressure 7 feed cylinder. I preferably make this feed cylinder lon enough to provide a feed movement of .9. out fourteen inches without changing the drill bits, but it can be made to give'any desired length of feed movement. The piston feeds outward from the rear end of the cylinder to its front end, and In order to prevent its feeding out of the cylinder, I

provide the front end-47 of the cylinder with a pin 49, which is placed transversely through the end of the cylinder, close to the body of the piston in a-position to be struck by he piston headwhen it reaches the end of its forward feed stroke.

The piston head is provided with a packmg ring 50, which preferably consists of a leather cry of thebore of the cylinder.

. smaller than the piston head is screwed on .the stud'and tightly against the washer,-

thus expanding it against theinner periph- The rear end of the bore of the feed cylinderis closed by a plug 52, which extends rearward of the cylinder a short distance. This plug is provided with a reduced threaded hub portionthat screws into the end of the cylinder which is threaded to receive it. A small axial hole 53, is drilled into the plug from the cylinder end a portion of its-length, and-a transverse hole 54, is drilled into the surface of the side of the plug to intersect it. These two intersecting holes form'the fluid inlet of the constant pressure or feed cylinder. The en- 1 trance to the transverse hole 54, is threaded and a nipple 55, is threaded to it. A three ay valve 55, which 1- term a pressure relief valve, is threaded to the nipple 55; a second nipple 58, is threaded to the valve, and a hose-59, is secured at one end to the nipple 58, and at its opposite end is secured to a nipple that is secured to the tee' 14, which connects with the hose 13. Thehose 15, is connected to-th'e tee. 14, and leads to a supply of compressed air. The rear end of the plug is formed into a wrench receiving surface, and a threaded hole 60, extends axially into its rear end,.in which is loosely threaded the threaded end of an adjustable brace-bar 61, the opposite end of which is formed into a wrench receiving surface.

The valve 55, is provided with a waste esca e aperture 55 which is arranged in the body of the plug of the valve so that when the valve is closedto the admittance of the actuating fluid to the cylinder, the

escape or waste passage is opened, which permits any actuating fluid in the cylinder at the rear of the piston head to instantly escape, see Fig. 2. A waste escape a erture 63, is also formed through the forwar end of the cylinder just back of the pistons most forward position in the cylinder, whibhpwhen the piston rod has been fed forward to its stop pin or washer, permits the actuating fluid flowing into the cylinder to escape to the atmosphere, thus relieving the piston from the pressure and notifying the attendant that the piston has reached the limit of its feed.

In order to support my improved rock drilling engme 1n stopes and. tunnels of mines,

cylinder by bolts 71, and the other is arranged to be clamped to the stoping bar. This clamp, is arranged to permit the drilling engine to swing in horizontal and vertical lanes, and to be set in any desired position.

he stoping column 68, comprises a tubular bar, in one end of which a serrated foot piece issecured. In the opposite end of the tubular bar a plug 76 is secured and an extension rod is threaded to it, which is provided with a ball at its outer end. This ball end is secured in a socket foot piece 77, the end of which is serrated. A wrench receiv- .ing surface portion 78 is formed on the pin 79, which is inserted transverse y through the foot iece just above the ball close to the side of t 1e threaded extension rod.

The operation of my improved rock drilling engine is as follows: The drilling engine, by which I mean the cooperating hammer and feed cylinders, the drill bit and water feed mechanism, and their cooperative elements, is operatively mounted on any suitable supportingcolumn, as shown in Fig. 1. The water supply tank is filled with water through the cup 25, and should be large enough to hold water enough for one or two or more shifts, and the actuatin fluid is conveyed to the tank through t e hose 27 The actuating fluid is also conveyed to the drillin engine through a hose 15,, from a suitab esource of supply. The com ressed ,.air forces the water from the tank t rough the hose 24, into the water chamber 21. I preferably use compressed air for the actuating fluid, but steam may be used if desired. When the pneumatic hammer is held in the hands of an operator, the hose 15 and-tee-14 and hose 59 are dispensed with and the compressed air simply fiows through the hose 13 to the port7 into the cylinder, and when the fluid pressure cylinder is used with the piston hammer, the compressed air is conveyed from a source of supply through the hose 15 to the tee 14, and through the hose 1 3 to the piston hammer cylinder and through the ose 59 t0 the constant pressure feed cylinder the flow being controlled by the valves 11 and 55, respectively, placed in the supply pipes close to the piston hammer and feed cylinders. The air enters the port 7 and assuming that the valve is at the forwardend of its stroke againstv the drill-bit, the air strikes the shoulder 35 of the valve and moves the valve rearward and continues to moveit'on its back stroke as the front end of the valve is smaller in diameter from the -"the air continuously presses the valve rear--' der 35 registers with the ward until the shou port 6, which releases the pressure on the valve as the air flows into the port and through the port holes 37, into the interior of the valve to the rear end of the cylinder and at practically the same time the ports 38 in the front end of the valve register with the inlet port 7, and the air flows into the interior of the valve and flows to the rear end of the cylinder filling the rear end of the cylinderand cushioning the valve at the ends of its rearward stroke and also starts the valve on its forward stroke as the airflows continuously through the valve ports 38, to the rear end of the cylinder and resses against the rear end of the valve and the bottom of its axial bore, and as the volume of air at the rear of the valve is ver much greater than the volume of air on t e shoulder 35*, the valve is thrown forward with great force and power against the end of the drill bit. The chamber 5 is formed to provide space for enough air to insure the expansive power aperture 17. When the valve strikes the drill-bit, the shoulder 35 and the recess adjacent to it are attheedge of the air inlet port 7 and the valve is instantl started rearward and its reciprocal stroke is re peated.

In most kinds of rock it is preferable to use compressed air to blow out the rock dust and rock cuttings as fast as they are made by the drill-bit in drilling the'holes, and to accom lish this I connect the branch air supply ose 13 to the inlet nipple of the dri 1- it, the live air then flows from the air compressor directly to the drill-bit and throu h the holein the drill bit that extends artial y through it to the bottom of the hole being drilled, and blows the rock dust and rock cuttings out'of the hole as fast as the drill makes them. When the rock makes a dry dust, it would, if allowed to flow away from the hole, cover the drill cylinder completely engine; in fact, miners cannot work long in dry rock dust without being subject to the danger of contracting lung trouble, and in order to effectually allaythe dust, I force live air under pressure from the air inlet port of the cylinder which flows to the center port in the nozzle, where it mingles' with a supply of water under pressure from the tank and Water chamber, which flows through the transverse ports of the nozzle to its center port, where the air atomizes the water, which 1s then forced out through the four small holes in the nozzle, in jets of atomized spray or mist, which, after the jets leave the discharge apertures in the nozzle, form a complete circular ring of atomized spray or mist which is discharged against the breast of the rock around the drill bit and around the hole being drilled, and I preferably arrange these jet vdischarging holes so that they will make a circular ring of mist around the hole of from, a few inches to from, about twelve to eighteen inches in diameter, as this mist is so fine and dense that the fine dust, as it flows from the hole can not get through it, and it is drowned and obliterated, while the coarse rock cuttings simply fall to the ground as they are either blown by air or washed by water from the'hole being drilled. This fine mist does not in the least interfere with the manipulation of the drilling engine or drill bit, and but a very small amount of air and water is necessary to effectually lay the dust.

The nozzle is set at an angle in the hub that will permit the discharge apertures to .throw a circular atomized spray of mist water, a predetermined distance, which is regulated by the length of the feed movement of the fluid pressure cylinder, that is, if the feed travel of the piston of the fluid pressure feed cylinder is fourteen inches, the travel ofthe piston hammer cylinder and of the drill bit will be fourteen inches also, and the inclination given to the nozzle in its bearing hub, is such that it will discharge a circular ring of atomized spray or mist from the farthest position of this fourteen inches of feed stroke to its nearest oint to the face of the rock in which the ho e is being drilled, around the drill bit and around the edge of the hole being drilled. This atomized mist encounters the rock dust at either extreme of the feed movement of the drilling engines, as it flows out of the hole and completely drowns and obliterates it. When, however, as in holes where the ground .is talcy-and is naturally damp enough to form a stiff or sticky mud in the bottom of the hole, and compressed air wi l not remove it, thenthe water pressure supply hose 24 can be removed from the water chamber inlet 22, and be connected direct to the inlet 41, of the drill bit, and the water flowing under pressure to the cutting point of the drill bit will wash out the stiff or sticky mud as fast as the drill makes it, and will keep the hole clear of it and the drill bit cool. When water under ressure is used in the drill bit, it will not e necessary to use the atomizing spray from the valve. By these arrangements of the water feed, I, am enabled to meet any condition of dust or mud or rock cuttings that may be encountered, in a simple and thoroughly ractical manner.

The pressure in tlie tank and the water pressure can be regulated by the valves in their respective supply hose to throw the jets of water straight to. the rock during the full stroke of the feed.

The iston hammer reciprocates very rapidly in the cylinder, striking the drill-bit at each stroke and causing an ap arently constant stream of rock dust to flow rom the hole being drilled. At the same time that the air is turned into the drill cylinder to start drilling a hole, air is also turned into the constant pressure feed cylinder by opening the valve 55, and the air flows throu h the aperture in the plug to the rear of t e piston head and exerts a constant and continuous, even, steady pressure against the piston'and feeds the piston head and rod and the hammer cylinder and the drill bitinto air and permits the iston to be moved back to the beginning of its feeding stroke and to permit the drilling engine to be adjusted to continue drillingthe hole deeper by inserting a longer drill-bit or of moving the drilling engine to start a new hole. When the stoping column and the drilling engine have been set inposition to drill a hole, the air is let into the feed cylinder first, and the feed piston moves the drill cylinder forward until the drill-bit bears against the rock. Theair is then turned onto the piston hammer cylinder, and the operator takes the nipple 10 in one hand and movesit u and down slowly throu h an arc of a circ e of from five to eight inches and thereby oscillates or rocks the hammer piston cylinder and the drill-bit and the feed cylinders' piston, and continues to rock them as long as the drilling is continued. This rocking motion causes the drill-bit to cut a clean smooth round hole without channeling, clogging or sticking as the fine rock cutting lips of the drill-bit are close together and bear evenly on the bottom of the hole. 7

My improved rock drilling engine is very the use of any suitable expansive fluid under pressure, such as steam, or of water, and my 1nvent1on especially contemplates the use of water as water can be used in place of air or steam 1n the feed cylinder to malntam a constant i'eeding pressure on the piston, it being simply necessary to provide an independent hose connection with a suitable water supply under a suitable water pressure to feedthe hammer cylinder and drill-bit forward as fast as the drill-bit cuts into rock, and the independent hose could be, if desired, attached directly to the water supply tank 25, that is used for supplying the water to lay the dust.

My pneumatic hammer dust laying rock drilling engine is very simple, light of weight, practical and durable and is very easily and quickly handled and manipulated.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a dust laying apparatusfor rock drilling engines, the combination with a rock drilling engine comprising a feed mechanism, a pistonhammer and its cylinder and a drill bit, a drill bit holding collet in said hammer cylinder, and the drill bit operatively supported in said drill holding collet, in operative striking relation to said piston hammer,

said cylinder having a water chamber formed therein, comprising a circumferential recess surrounding said drill holding collet, and a water inlet aperture into said chamber, a reducing nipple threaded to said aperture, means for supplying water under pressure to said chamber, means connected with said water chamber for discharging jets or atom-,

ized sprays of water from said water chamber and from said cylinder alongside of the drill bit and against the sides of the hole in luck while it is being drilled, said drill bit having an axial hole therein from its rock cutting end, extending partially through it, and a side inlet through the shell of said drill bit into its axial hole, and means connected with said side inlet for conveying a supply of compressed air to the cutting point of said drill bit, and to the bottom of holes in rock while drilling them, substantially as described.

2. In a dust laying apparatus for rock drilling engines, the combination of a rock drilling engine and a drill bit, said drill bitbeing rovided with an axial hole extending partia ly through it from its rock cutting end and a lateral side inlet through its shell into said axial hole, said engine comprising a cylinder with feed mechanism, a piston hammer reciprocally mounted in said cylinder,-a drill holding collet, secured in said cylinder, and the drill-bit operatively supported loosely in said drill holding collet in operative striking relation to said piston hammer, said cylinder having a'water chamber therein, a blow out aperture and a water inlet aperture into said chamber, a water supply hose connected to said water chamber, a lug threaded to said blow-out aperture, said cylinder also having water discharge apertures extending from said water chamber, means for discharging jets of water from said water chamber and discharge apertures, alongside of the drill bit and against the sides of the hole in rock, while'it is being drilled and means including a hose connected to said inlet aperture of said drill bit for discharging compressed air at the rock cutting point of said drill-bit and in the bottom of holes in rock while drilling them, substantially as described.

. 3. In a dust laying rock drilling engine, an operative rock drilling engine, having a water receiving chamber, formed in said rock drilling engine, an apertured nozzle connected with said water chamber and means including a valve controlled air discharge passage formed in said engine connected with said water receiving chamber, for discharging sprays of water from said rock drilling engine against the edges of holes in rock while drilling them, substantially as described.

4. In a dust laying rock drilling engine, an operative rock drilling engine, having awater receiving chamber therein, means for connecting said water-receiving chamber with a supply ofwater under pressure, a discharge passage leading from said water cham her and a mist-making nozzle operatively arranged in said discharge passage and arranged and adapted to throw water sprays in a circular ring around the edges of'holes in rock while drilling them, substantially as described.

5. In a dust laying rock drilling engine, an operative rock drilling engine, having a water receiving chamber therein, means for connecting said water-receiving chamber with a supply of water under pressure, a downwardly inclined discharge passage leading from said water chamber, a nozzle seat in said downwardly inclined discharge passage, and a mist-making nozzle operatively arranged in said discharge passage and arranged and adapted to divide said water supply into a plurality of atomized jets and sprays and to discharge said atomized jets and s rays in a circular ring around the edges of holes in rock while drilling them, substantially as described.

6. In a dust laying rock drilling engine, an

o erative rock drilling engine and a rock cutting drill bit operatively connected thereto, said engine having a wateriece1ving cham-' ber, means including a passage into the side of and through said drill bit to its cutting point for admitting air under pressure for ejecting rock cuttings from holes in rock while drillin them, and an adjustable valve controlled air discharge passage and a mist making nozzle connected with said water chamber arranged and adapted to discharge a spray of water around the edges of said holes and drown and obliterate the rock dust as it flows from them.

7. In a dust laying rock drilling engine, an

. of and through sai operative rock drilling engine and a rock cutting drill bit operatively connected thereto, said engine having a water-receiving chamber, means includin a passage into the side 5 drill bit to its cutting point, means to supply a fluid under pressure to said passage for e'ectin rock cuttings from holes in rock While dri ling them, said engine having an adjustable valve controlled air discharge passage provided with a nozzle containing passages thatconnect with said air passage and with said water chamber, arranged and adapted to discharge jets of water around the edges of said holes and drown and obliterate'the rock dust that flows from them. Y j 8. In a dust laying rock drilling engine, an operative rock'drillin g engine, and a drill bit supported thereby having an axial aperture extending partially through it from its rock cutting end, and vmeans for connecting a supply of fluid under pressure to said drill-bits axial apertureand for discharging said supply of fluid under pressure at the cutting oint of said drill bit and in the bottom of lioles in rock while drilling them, said engine having a water-receiving chamber and a combined air and water discharge nozzle arranged and adapted to discharge jets and sprays of water around the edges of holes in rock while drilling them.

9. In a dust laying rock drilling engine, a

piston hammer cylinder, provided with a water receiving chamber, means for connecting said water-receiving chamber with a water sup ly under pressure, a discharge outlet to sai water chamber in said cylinder, a lug cast on said cylinder, a nozzle chamber formed in said lug, said cylinder havin a discharge aperture from said water cham er to said nozzle chamber, and an air port from I the interior of said piston hammer cylinder to said nozzle chamber, and a nozzle in said nozzle chamber, arranged to receive a supply of air and water from said piston hammer cylinder and from said water. chamber and arranged to discharge a spray or mist of wa-' ter around the edges of holes in'rock while drilling them, substantially as described.

10. In adust laying rock drilling engine, the piston hammer cylinder, provided with a water chamber, of a hose connected at one end to said water chamber, and means for connecting said hose at its opposite end to a supply of water under pressure, a hub or lug on said cylinder above said water chamber, a nozzle seat formed in said lug and inclined convergingly to point ahead of said cylinder,

, said cylinder having a valved air-port extending to said seat, and a nozzle seated in said nozzle seat, and provided with passages connected with said air port and said water chamber, and arranged and adapted to'discharge a water mist around holes in rock while they are being drilled, substantially as described.

11. In a dust laying rock drilling engine,

the combination of a rock drilling engine,

provided with a water receiving chamber, a

water-supply pipe operatively connected to said water chamber, a hub or lug on said rock drilling engine, a nozzle seat in said hub or lug, said engine having a discharge passage connecting said nozzle seat with said water receiving chamber, an air port in said rock drilling engine, connected to said nozzle seat, and with means for connecting a sup ply of compressed air, an adjustable valve in said air ort, and a nozzle in said nozzle seat provided with intersecting passages connected with said air ort and said water chamber, and arrange and adapted'to discharge under air pressure a plurality of jets of atomized spray around the edges of holes inrock while drilling them, substantially as described, Q l

12. In a dust laying rock drilling engine, the combination in a rock drilling engine,

said engine having a water chamber, a nozzle chamber in said rock drilling engine, means including a hose for connecting asupply of'water under ressure to' said water chamber and to sai nozzle chamber, and means including a hose for connecting an air supply under pressure to said nozzle chamber and a nozzle in said nozzle chamber arranged and adapted to discharge a spray of water under air pressure against the surface of rock and around the edges of holes in rock while drilling them, substantially as described' 13. In a dust laying rock drilling engine, the combination with the feedmechanism and piston hammer cylinder, and an operative rock cutting drill bit, of a water chamber formed in the drill bit holding end of said piston hammer cylinder, a projecting lug on said cylinder, an inclined a erture formed 111 said lug, connected to sai water chamber, and inclined convergingly toward the plane. of said cylinders axial center, and a nozzle in said inclined a erture provided with an axial port exten ing partially through it, radial orts extending from said axial port throng said nozzle and arranged to connect with said water chamber, obliquely arranged discharge orts in said nozzle arranged to connect with its axial port, and means including an air port for discharging a spray of water from said nozzles discharge orts under air pressure against the surface 0 rock 'andaround the edges of holes in rdck while prising an air and Water commingling nozzle, means for connecting the nozzle to su plies of air and Water under pressure, t e ads of the nozzle being arranged at an angle to the axis of the drill as shown and described operatively connected to a supply of 10 ring around said drill bit during its operative feeding rock drilling movement and against the surface of rock around the holes being drilled. I

In testimony whereof I afiix my signature in presence of two witnesses.

. onARLEsrr. SHAW.

Witnesses:

G. SARGENT ELLIOTT, Bnssm THOMPSON.

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