US829071A - Rock-drilling machine or engine. - Google Patents

Description

No. 829,071. PATENTED AUG. 21, 1906. H. HELLMAN & L. c. BAYLES.

ROCK DRILLING. MACHINE 0R ENGINE.

APPLICATION FILED JULY 12,1905.

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PATENTED AUG. 21', 1906.

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H. HELLMAN & L. 0. BAYLES. ROCK DRILLING MACHINE 0R ENGINE. APPLIUATIQN FILED JULY12,1905.

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Unrrnp STATES PATEN T OFFIQE.

ROCK-DRILLING MACHINE OR ENGINE.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed July 12, 1905. Serial No- 269,409.

To all whom it may concern:

Be it known that we, HENRY HELLMAN and LEWIS CONDICT BAYLES, citizens of the United States, both residing at Johannesburg, Transvaal, have invented certain new and useful Improvements in or Relating to Rock-Drilling Machines or Engines, of which the following is a specification.

This invention relates to rock-drilling machines or engines, and in particular to that type which is adapted to be actuated by means of compressed air or other compressible or expansive gaseous fluid.

Our invention has for its object the pro duction of a machine or engine of the nature indicated which shall be of comparatively small dimensions and of compact, simple, and inexpensive construction. One feature of a machine or engine constructed in accordance with our invention lies in the fact that the valve and other vital parts are completely inclosed and are thereby protected from damage consequent upon the rough handling such machines usually receive at the hands of their operators; further, the machine or engine is easily manipulated or controlled and being of comparatively light construction may be easily transported, as may be required. It is applicable to machines in which a valve is employed for controlling the distribution of the actuating fluid and also to a machine or engine in which the piston or equivalent reciprocating member is itself utilized for effecting such distribution on the principle of a valveless chipping-hammer.

In the accompanying sheet of illustrative drawings, forming part of this specification,

we show a machine or engine of the nature in-' dicated embodying in its construction the several novel features or improvements constituting our invention.

In the several figuresor views of the drawings and throughout the following detailed description thereof the same or similar parts are designated by the same reference-numerals.

We will forthwith proceed to a detailed descriptionof the improvements by aid of'the drawings.

Figure 1 represents the machine or'engine in longitudinal part-sectional elevation. Fig.

2 is a transverse section of Fi- 1, the plane of section being indicated by t e dotted line the handle or crank 18 attached thereto, by

means of which rotary motion is imparted to the drilling or boring bit or tool and also showing a device whereby lubricant may be introduced into the machine. Fig. 9 is a partly-sectional view of the machine or engine, showing the opening extending throughout the drill or bit.

f The power-cylinder, which is represented at 1, is slidingly and rotatively carried in an outer cylindrical protective casing 2. The power-cylinder 1 at its rear end is shown enlarged or made of increased diameter. A portion of the rear end is made of approximately the same diameter as the bore of the protective casing 2, so that it forms a piston 3, slidingly supported in said casing 2.

We do not illustrate any device or means for controlling the distribution of the actuat ing fluid or for alternately admitting said fluid to and exhausting it from either end of the power-cylinder 1, as this does not in itself constitute any feature of the present invention. It may be accomplished, for example, by means of a valve of suitable construction, located, say, in the enlarged rear end ofthe power-cylinder 1, which would then constitute the valve box or chamber, or, alternatively, the distribution of said fluid may be effected by or through the medium of the power-piston or reciprocating percussive member 4 (the forward end of which is indicated in Fig. 1) ma similar manner to the machine known as a valveless chipping or riveting machine, or the distribution of the motive fluid may be accomplished in any other suitable and preferred manner.

The valve or device controlling the admission of the actuating fluid is by preference so constructed and arranged that the fluid is admitted to the power-cylinder 1 from the protective casing 2 at the rear of the piston 3 and exhausted into the casing 2 in front of said piston 3. In case a valve is employed located at the rear of the power-cylinder 1 then ports 5 may be formed in the rear end of the cylinder 1 in front of the piston 3 which Beyond the piston 3 the power-cylinder 1 i is made of reduced diameter and provided with an external screw-thread. Round the rear end of the piston 3 inside the casing 2 is located a cup-leather 6, and screwed over the end of the power-cylinder 1 is a nut 7, which serves to keep the cup-leather 6 inposition at. the rear of the piston 3. Thus a fluid-tight sliding joint is formed round the rear end of the cylinder or piston 3 and the interior of The rear end of the constructed with a the protective casing 2. powercylinder 1 is also screw-threaded hole 8. screwed the end of arearwardly-extending tubular piece or pipe 9. Into the bottom of the hole 8 and retained in position therein by the end of the pipe 9 is a wire-gauze strainer 10, whose function is to prevent the ingress into the valve-box or power-cylinder of any particles of solid matter that may be suspended in or carried by the actuating gaseous fluid. In the forward end of the pipe 9 are formed'a number of holes 11, placing the interior of the casing 2 at the rear of the piston 3 in communication with the interior of said pipe.

On the rear end of the protective casing 2 is screwed or otherwise suitably secured a cap or cover 12, which is constructed with a screw-threaded hole 13, which forms the actuating-fluid inlet or intake adapted to receive the throttle-valve or other connection with the actuatingfluidsupply pipe. This hole 13 communicates with the interior of said casing 2. Between the end of the casing 2 and the cap 12 is placed a packing-ring 14 to prevent the escape of the fluid between said cap 12 and easing 2. The actuating fluid entering at the rear end of the casing through the hole 13 is free to pass through the holes 11 in the forward end of the pipe 9, thence through the strainer 10 to the powercylinder 1'.

The cap 12 of the casing 2 is constructed with a central hole 15, through which works the rearward-extending pipe 9. The cap 12 is constructed to form a gland round said pipe 9, and in it is located a cup-leather 16 or other suitable packing. A gland-nut 17, screwed into the cover 12, serves for retaining said cup-leather 16 in position in the cover 12 round the pipe 9. By this construc tion the escape of anyof the actuating fluid through the cap or cover 12 is prevented, while the pipe 9 is capable of being rotated therein.

The rear extremity of the pipe 9 is constructed with external and internal threads of different pitch. On the end of the pipe 9 j is screwed a crank 18, which serves for rotating the power-cylinder 1, the rotation of which, as hereinafter explained, effects syn chronous rotation of the drilling or boring Into the hole 8 is bit 19. Into the end of the pipe 9 is screwed a nut 20, which serves for retaining the crank 18 in position. The pitch of the external screwthread for the crank 18 being different to the pitch of the internal screw-thread for the nut 20 causes said nut to act as a locknut for-the crank 18, and so prevents said crank being screwed off the end of the pipe 9 in the operation of the machine. The nut 20 is constructed with a longitudinal recess 21 on the inside and at the bottom of the recess 21 with a hole 22, in which is seated a ball or sphere 23. In an annular groove 24, formed round the forward end of the recess 21, is placed a split ring or other suitable transverse ly-disposed piece 25, between which and the ball or sphere 23 is arranged a spiral spring 26. force of the actuating fluid in the pipe 9, serves to keep the ball or sphere 23 on its seating inside the hole 22, and so prevent the escape of any of the actuating fluid at this point. vice whereby lubricant may be introduced into the rear end of the pipe 9, from whichit passes into the machine. The depression of the ball or sphere 23 against the spring 26 allows *lubricant to be injected through the hole 22 and recess 21 into the interior of the pipe 9. Round the pipe 9, between the cap or cover 12 of the protecting-casing 2 and the crank 18, is adjustably fixed a sleeve 27 which serves for fixing the power-cylinder 1, inside the protective casing 2. The sleeve 27 is split and formed with lugs or projections 28 29, one, screw-threaded hole 30 and the other, 29, with a plain hole 31. ed with a head or hand wheel 33 and with a shoulder 34, engaging the outside of the lug 29, in which is formed the plain hole 31. rotating the screw 32 in one direction the lugs 28 29 are drawn together and the band 27 so secured on the pipe 9. This device is used, for example, when changing drills and drilling downwardly-inclined holes, the power-cylinder 1 being then moved in a rear: ward direction in the casing 2 and the sleeve 27 loosened and slid longitudinally on the pipe 9 until it engages the rear end of the gland-nut 17, when the screw 32 is rotatedto tighten the sleeve 27, which then retains the powercylinder 1 in the casing 2. After the bit has been changed the screw 32 is rotated in the reverse'direction to loosen the sleeve 27, and it is slid in a rearward direction to the back of the pipe 9 and fixed in that position by the screw 32. This device may be also employed for fixing the power-cylinder 1 inside the protective casing 2 when transporting the machine or for limiting the range of feed when it is desired to drill a hole of a given depth.

Surrounding the protective casing 2 is a sleeve or band 35, shown constructed with a cone 36, by means of which it may be fixed The spring 26, assisted by the IOC 28, of which is provided with a 32 is a screw construct- Byv in an ordinary columnclamp or other suitable support. This sleeve or clamp is shown split and with the ends formed with lugs 37, in which are formed holes for the reception of a bolt 38, fitted with a nut 39 for tightening said sleeve 35 round the protecting-casing 2. The protective casing 2 is adapted to slide longitudinally through the sleeve 35, so that the protecting-casing may be adjusted longitudinally as may be desired.

A port 40 (shown in Figs. 1 and 5) represents the port along which the actuating fluid is conducted into the front end of the powercylinder 1 to impel the piston or;reciprocat mg percussive member 4 on its return stroke,

In the forward end of the protective casing 2 is screwed or otherwise suitably secured a bush or cylindrical piece 41, through which works the power-cylinder 1. I11 this bush 41 are formed a number of holes or ports 42, shown made parallel with the longitudinal axis of the cylinder 1. These ports 42 place the interior of the protective casing 2 in communication with the open, and they constitute the ports by which the exhaust escapes from saii casing. The ports 42 direct the exhaust in a forward direction or toward the rock-face, and thereby prevent mud or dust that issues from the bore-hole rising or being thrown in the face of or toward the operator of the machine.

I11 the forward end of the power-cylinder 1 is located an impact-piece 43, which serves for receiving and transmitting to the drilling or boring bit 19 the impacts of the reciprocating percussive member 4. The impactpiece 43 projects into the bore of the cylinder 1 and is constructed at its forward end with an enlargement 44, which by engaging the front end of the cylinder 1 prevents it enter ing said cylinder beyond a certain point.

In the power-cylinder 1 is formed a port 45, which is normally closed by the inner end of the impact-piece 43. This port 45 is provided for the purpose of putting the machine out of operation in the event of the impactpiece 43 being driven forward in the bore of the powercylinder l sufficiently far for the reciprocating percussive member 4 to overrun said. port 45. The impact-piece 43 will be so driven'forward in the event of the drilling or boring bit 19 not coming into contact with the rock-face or bottom of the hole being drilled when the machine is brought into operation. When the reciprocating percussive member 4 overruns the port 40, the actuating fluid entering the cylinder 1 along said forward supply-port 40 being able to escape by said port 45 prevents the actuating fluid impelling said reciprocating percussive member 4 through its rearward stroke until the impact-piece 43 is moved sufliciently far in a rearward direction in the bore of the cylinder .1 to again cover the port 45, whereupon the actuating fluid acting on the front end of the piston 4 traverses it through its rearward stroke. The feeding of the drill will cause the drill or bit 19 to move the impact-piece 43 in a rearward direction to close the port 45.

A portion of the power-cylinder 1 at the forward end is made of reduced diameter externally, forming a shoulder 46 round the power-cylinder 1. Round the power-cylinder 1 and abutting the shoulder 46 is a swivel 47. ;(See Figs. 1 and 6.) The portion of the cylinder 1 extending to the front of the swivel 47 is formed with an external screw-thread 48, and over it is screwed the front head 49. The rear end of the fronthead 49 serves to keep the swivel 47 in position round the cyl inder 1. Inside the swivel 47 is formed an annular groove 50, and round the impactpiece 43 is formed an annular groove 51. The annular groove 50 in the swivel 47 and the annular groove 51 in the impact-piece 43 are placed in communication by the radial ports 52, formed in the front head 49. (See Figs. 1 and 6.) The swivel 47 is constructed with a screw-threaded stem 53, over which is screwed a cap 54, which serves for attaching a hose-pipe 55, employed for conducting water or other liquid to said swivel 47. A port 56 is formed through the screw-threaded stem 53, along which the liquid may pass from the pipe to the annular recess 50 in the swivel 47 A receptacle for containing the water or other liquid is represented at 57, into which receptacle the other end of the hosepipe 55 is placed. 7

A port 58 is provided longitudinally of the impact-piece 43, along which port a quantity of the actuating gaseous fluid may pass from the forward end of the power-cylinder 1. In the impact-piece 43 one or more angular or forwardly-inclined ports 59 are formed, which place the annular recess 51 in communication with the longitudinal hole 58. The longitu dinal hole 58 at the point where the angular ports 59 join or communicate with it is enlarged, so that the actuating fluid as it passes over the inner ends of the angular ports 59 by expansion as it enters the enlarged front por tion of the port 58 tenjls to create a vacuum in the recess 51, radial. ports 52, and recess 50 in the swivel 47, and so causes the water to be forced by atmospheric pressure out of the receptacle 57 up the pipe 55 to the swivel 47 and from the latter to the longitudinal hole,

58 in the impact-piece 43.

In the front head 49 is formed an annular projection 60, which serves as a stop for the forward end of the impact-piece 43 and prevents the latter being moved forward inside the cylinder 1 farther than is necessary for it to fully uncover the port 45.

Inthe bore of the front head 49 at the forward end is placed a bush61. (See Figs. 1 and 7.) This bush 61 is constructed with a hole of square or polygonal cross-section, and

steel 19 is constructed with a longitudinal hole 62 which coincides with the longitudinal i hole 58 in the impact-piece 43, so thatthe actuating fluid from the cylinder 1 and the water or other liquid from the swivel 47 pass into the longitudinal hole 62 in the steel 19 and are carried to or in roximity to the cutting extremity of the dri l or bit 19.

The manner of operating the machine may be described as follows: Assuming that the machine has been mounted in the requisite position in relation to the rock-face and the shank or that portion of thedrill which is made of square or polygonal section projected 61 in the front head 49 until it abuts the forward end of the impact-piece 43,

into the bush then the throttle-valve is operated to admit the actuating fluid through the intake 13 into the rear end of the casing 2 and at the rear of the piston 3 and packing 6. The expansive force of rear end of the casing 2 exerts pressure on the rear end of the power-cylinder 1 and nut 7 and forces the power-cylinder 1 forward in the protecting-casing 2 until the cutting end of the bit or tool 19 contacts with the rockface, and so long as the supply of the actuating fluid continues the power-cylinder 1 is by this means moved forward and the drill or bit kept continuously up to its work. At the same time the actuating gaseous fluid is free to enter the pipe 9 through the holes 11. From the pipe 9 it passes through the gauze strainer 10, which, as previously explained, serves to prevent the ingress of particles of solid matter to the power-cylinder 1, or valve, when the latter is employed. Having passed through the strainer 10, the actuating fluid is then admitted to the power-cylinder 1 alternately to either end of the power-piston or reciprocating percussive member 4, and so impels said latter member on its forward stroke (when it strikes on the impact-piece 43) and through its rearward and return stroke. The impacts of the reciprocating percussive member 4 on the inner end of the impact-piece 43 are'transmitted by the latter to the inner end of the shank of the drill-steel 19, which causes the cutting end of the drill or bit to penetrate the rock to form the hole. After the actuating-fluid supply has been turned on the crank or handle 18 is rotated,

which imparts rotary motion to the pipe 9, and the latter being rigidly connected to the rear end of the power-cylinder 1 rotates the latter inside the protecting-casing 2. The internal shape of the bush 61 and the corresponding external shape of the shank of the the fluid so admittedto the drill-steel 19 causes the latter to rotate in unison with the power-cylinder 1, so that the position 'of the cutting edges of the drilling-bit or'boring-tool is varied or altered at each successive blow. The fluid exhausting through the ports 5 into the casing 2 at the front of the piston 3 escapes through the ports 42 in the forward end of the casing and being directed toward the rock-face and round the surface on which the drilling or boring tool 19 is operating prevents the minute particles of rock or dust or mud being thrown in the direction of the operator of the machine by the impacts of the bit. The actuating fluid, as previously explained, being free to pass along the port 58 inthe impact-piece 43 draws the water or liquid by suction fromthe vessel 57 to the swivel-piece 47, from which it passes by the ports 52 to the recess 46 between the impact-piece 43 and bore of the cylinder 1 and from the latter by the forwardly-inclined ports 59 to the longitudinal hole 62in the drill-steel, along which it passes to or in proximity to the cutting extremity of the drill or bit. It will be obvious that the water-supply could be dispensed withas, for example, when drilling downwardly-inclined holesand that the supply of the actuating fluid into the hole may be also dispensed with, if preferred; further, that a quantity of the actuating fluid may be used without the wa ter to eject the cuttings or the water be used without the actuating fluid, in which event the liquid in the receptacle 57 could be placed under pressure, so that the water would be forced up to the swivel and along a port or ports in the drill-steel to the cutting end thereof. We prefer, however, to use both the actuating fluid and water, as we find that by this means the cuttings are expelled and dust prevented at the expenditure of a much less volume of water than is possible when water is used alone. 7

What we claim as our invention, and desire to protect by Letters Patent, is-

1. In a drilling or boring machine or engine, in combination a drill having an opening throughout its length, means for feeding the drill through the medium of the actuating fluid, means for introducing into the longitudinal opening of the drill a quantity of the actuating fluid to eject cuttings from the bore-hole, and means for conveying to the end of the drill a quantity of water toprevent the formation of dust.

2. In a drilling or boring machine or engine, in combination a drilling or boring bit having an opening throughout its length, means'for advancing the drilling or boring bit through the medium of the actuating fluid in its passage through the machine, means for conducting into said longitudinal opening a quantity of'the actuating fluid to eject the cuttings from the bore-hole and means for supplying a quantity of water so that it is conveyed into the bore-hole by said actuating fluid to prevent the formation of dust.

3. In a drilling or boring machine or engine, in combination, a power-cylinder a protective casing surrounding said cylinder, means located at the rear end of said cyli'n der for forming an air-tight sliding joint between the cylinder and easing, means for introducing the motive fluid into the interior of the casing at the rear of the cylinder to utilize the pressure of the actuating fluid in its passage through the machine to feed the drill or engine, said drill having an opening throughout its length, and means located at the front of the power-cylinder for introducing a quantity of the actuating fluid to the said longitudinal opening to eject cuttings from the bore.

4. In a drilling or boring machine or engine, in combination, a power-cylinder, an external casing slidingly supporting said power-cylinder, means carried at the rear endof the cylinder for forming an air-tight sliding joint between the cylinder and protective casing, means for introducing the actuating fluid into the casing at the rear of the,

power-cylinder to utilize the pressure of the actuating fluid to feed a drill having an opening throughout its length, means for introducing into said longitudinal opening a quan' tity of the actuating fluid to eject cuttings from the bore-hole, and means for introducing liquid to the bore-holes to prevent the formation of dust.

5. In a drilling or-boring machine or engine, in combination, a power-cylinder and an outer protective casing in which said cylinder is slidingly and rotatively mounted, means at the rear of said cylinder for forming an air-tight sliding joint between the cylinder and casing, means for introducing the actuating fluid into the casing at the rear of the cylinder to utilize the pressure of the actuating fluid in its passage through the machine to feedthe drill and means located at the forward end of the power-cylinder for permitting a quantity of the actuating fluid to pass through the drill-steel into the borehole, and means for introducing a quantity of water in such manner that it is conveyed by the actuating fluid to or in proximity to the bottom of the hole being drilled for preventing the formation of dust and for ejecting the cuttings.

6. In a drilling or boring machine or en'- gine, in combination, a power-cylinder and an outer protective casing in which said cylinder is slidingly and rotatively mounted, means located at the rear of the cylinder forming an air-tight sliding oint with the interior of said casing, means attached to the rear of the cylinder for rotating the cylinder said means serving to place the interior of the casing in communication with the cylinder, and for conducting the actuating fluid thereinto, means for admitting the actuating fluid into the casing at the rear of the powercylinder to utilize the pressure of said fluid to advance the power-cylinder in its casing to feed the drill, means for passing a quantity of the actuating fluid through the drillsteel and means for introducing liquid into the ports or passages for the actuating fluid so that said fluid serves to convey the liquid to the cutting extremity of the drill or bit and ports formed in the front of the casing which serve to direct the exhaust toward the front end of the machine, substantially as described.

7. In a drilling or boring machine or engine, in combination, a power-cylinder and a casing in which said. cylinder is slidingly mounted, packing located at the rear end of said cylinder forming an air-tight sliding joint with the casing, a pipe attached to the rear of the cylinder inside the casing, a cap on the rear of the casing through which said pipe works, packing located between said cap and pipe for preventing the egress of the actuating fluid between the cap and pipe, means located on the rear of the pipe for rotating the pipe and through it the power-cylinder, said pipe being constructed with holes which serve to conduct the actuating fluid to the cylinder, and the casing-cap with an inlet which constitutes the intake for the actuating fluid, an impact-piece located at the forward end of the power-cylinder, a drill or hit loosely positioned in front of said impactpiece in such manner that it'is compelled .to rotate with the power-cylinder, the impactpiece and drill-steel being constructed with ports terminating at or in proximity to the cutting end of the drill or bit along which a quantity of actuating fluid may pass from the cylinder and means for conducting water to said ports so that it is conveyed by the actuating fluid to the cutting end of the drill or bit to prevent the formation of dust and to eject the cuttings, substantially as described.

8. In a drilling or boring machine or engine, in combination, a power-cylinder carrying a percussive apparatus, an impact-piece located in the forward end of said cylinder, a drill-steel loosely positioned in front of said impact-piece in such manner that it is com pelled to rotate in unison with the powercylinder, the impact-piece and steel being constructed with longitudinal holes, the hole in the steel terminating at or in proximity to the cutting end thereof, and the impactpiece with ports which place a recess between the impact-piece and interior of the cylinder in communication with the longitudinal hole, a swivel carried by the cylinder in communication with a recess between the impactpiece and bore of the cylinder and means for introducing water to said swivel, an outer protective casing in which said cylinder is slidably mounted, packing located at the rear of the cylinder making a fluid-tight sliding joint with the interior of said casing and constituting the rear end of said cylinder a piston within the casing, a pipe secured to the rear end of the cylinder formed with holes placing the casing at the rear of the cylinder in communication with supply-ports in said cylinder, a cover for the rear end of the casing, packing in said cover for preventing the,

egress of the actuating fluid between said pipe and cover, means for rotating the pipe to rotate the cylinder and with it the drill or bit, and means for conducting the actuating fluid to the casing at the rear of the cylinder to feed the drill by the force of the actuating fluid in its passage through the machine, substantially as described.

9. In a drilling or boring machine or en gine, in combination, a power-cylinder carrying a percussive apparatus and the drilling or boring bit or tool, an outer protective casing in which said cylinder is slidably supported, means for making a fluid-tight sliding joint between the rear end of the cylinder and the protective casing, a pipe fixed to the rear end of said cylinder which serves for admitting the actuating fluid to the power-cylinder from the casing, a cover fitted in the rear of the casing, packing in said cover for preventing the egress of the actuatin fluid between the pipe and cover, and an arIiustable sleeve on the pipe at the rear of the cover for fixing the power-cylinder in the protecting-casing, substantially as described.

10. In a drilling or boring machine or en gine, in combination, a power-cylinder carrying a percussive reciprocating member, an impact-piece positioned in the forward end of said cylinder, a drill or bit loosely positioned inthe front of said impact-piece constructed so that it is compelled to rotate in unison with the cylinder, means for introducing a quantity of the actuating fluid and a quantity of water through the impact-piece and drill-steel to the bore-hole to prevent the formation of dust and to eject the rock cuttings, an outer protective casing in which the power-cylinder is slidingly and rotatively carried, apertures in the forward end of said casing through which the exhaust is directed toward the rock-face, packing located at the rear of the cylinder forming a fluid-tight sliding joint with the interior of the casing and constituting the rear end of the cylinder a piston within the casing to utilize the expansive force of the actuating fluid to advance or feed the drill, a pipe rigidly connected to the rear end of the power-cylinder and extending in a rearward direction and formed with holes through which the actuating fluid may pass from the casing to the power-cylinder to ac tuate the percussive reciprocating member, a cover on the rear end of the casing through which said pipe works, packing located in said cover for making a fluid-tight sliding joint round the pipe, means for introducing the actuating fluid into the casing at the rear of the cylinder, means for rotating the pipe to rotate the cylinder and drill or bit and means for fixing the cylinder inside the protective casing, substantially as described.

11. In a drilling or boring machine or engine, in combination, a protective casing, a power-cylinder slidably and rotatively carried in said casing, said cylinder carrying a percussive reciprocating member, said cylinder being enlarged at its rear end to form a piston working in said casing and constructed with a port at the forward end and with exhaust-ports opening into the casing at the front of the piston or rear end of the cylinder, an impact-piece loosely positioned in the forward end of the power-cylinder which receives and transmits the impacts of the reciprocating percussive member to the drill or bit, said impact-piece normally closing the port in the forward end of the cylinder which port serves for preventing the reversal of the reciprocating percussive member in the event of the impact-piece being driven forward to uncover said port, by allowing the actuating fluid to escape from the front of the reciproeating percussive member, the impact-piece being constructed with a longitudinal hole or port and with an external recess and angularly-disposed forwardly-inclined ports placing said recess in communication with the longitudinal hole at the forward end, a swivel encircling the forward end of the power-cylinder formed with an internal recess, the power cylinder being constructed with ports placing said recess in communication with the annular recess in the impact-piece, a pipe and receptacle through and from which water or other liquid is supplied to the swivel, a front head on the end of the power-cylinder, a bush fitted in said front head formed with a hole of square or polygonal transverse section, a drill-steel loosely positioned at the forward end of the cylinder constructed with a portion of its shank of square or polygonal section corresponding to the hole in the bush in which it fits and by means of which it is compelled to rotate in unison with thepower-cylinder, the drill-steel being formed with a longitudinal hole coinciding with the longitudinal hole in the impact-piece, a bush or ring fitted in the front end of the casing round the power-cylinder formed with holes for direct ing the exhaust toward the rock-face, an adjustable supporting-sleeve surrounding the protective casing for mounting the machine on a suitable support, a packing located at the rear of the cylinder or piston formed thereon, a nut retaining said packing in position said packing preventing the passage in a forward direction between the piston and cylinder of the actuating fluid so that theforce of the fluid is utilized to feed the drill, a pipe iixed to the rear end of the cylinder, a gauze-' wire strainer located between said pipe and interior of the cylinder for removing particles of solid matter before it passes into the interior of the cylinder, said pipe being constructed with ports placing the interior of the casing at the rear of the piston in communication with the interior of the pipe through which the actuating fluid enters the cylinder, a cover on the rear end of the casing through which the pipe works said cover being constructed with an inlet which constitutes the intake, and to form a gland round said pipe,

packing between said cover and rear end of the protective casing, packing and gland nut J in the cover surrounding the pipe for preventing the egress of the actuating fluid between the pipe and cover, a handle fixed on the rear end of the pipe, a nut screwed into the end of the pipe which serves as a locknut for the handle, said nut being constructed with an aperture, a sphere in said aperture and a spring for maintaining said sphere on its seat therein whereby lubricant may be introduced into the pipe to lubricate the machine, and a sleeve adjustably attached to the pipe between the rear cap of the casing and the handle for fixing the power-cylinder in the casing, substantially as described.

In witness whereof we have hereunto set our hands in the presence of two subscribing witnesses.

HENRY HELLMAN. LEWIS CONDICT BAYLES.

Witnesses:

CHAS. OVENDALE, -R. OVENDALE.

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