US892082A - Rock-drilling machine. - Google Patents

Description

I No. 892,082.

W. PRELLWITZ. ROCK DRILLNG MACHINE. APPLIGATION FILED APB 17 190e UNITED sraajns PATENT operon?.

WILLIAMPRELLWITZ, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOI'iL-RAND COM- PANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

ROCK-DRILLING MACHINE.

Specification of Letters Patent.

Patented .Tune 30, 1908.

Application filed April 17, 1906. Serial No. 312,090.

To alt 'whom it may concern.'

Be it known that I, WILLIAM PRELLWiTz, a citizenof the United States, and resident of Easton, in the county of Northampton and State of Pennsylvania, have invented a new and useful Improvement in Rock-Drilling Machines, ofwhich the following is a specification.

lMy invention relates to an improvement in rock drilling machines and has for its object to provide means for causing an intermittent discharge of water and air through the drill steel at each stroke of the drill for thoroughly cleansing the drill hole of the cuttings and also laying the dust which arises from the cutting bit of the ,drill steel striking the rock. Furthermore, the several parts are so constructed and arranged that only a small amount of Water is used for each stroke of the drill.-

In the accompanying drawings, Figure 1 is a view partially in longitudinal central sec-V tion and partially in side elevation of so much of a rock drilling machine as will give a clear understanding of this invention, the drill piston being shown at the limit of its rearward movement, and Fig. 2 is a similar view with the drill piston shown at the limit of itsforward movement, the piston alsobeing shown rotated a quarter turn.

The cylinder is denoted by 1 and it is pro- A .vided with the usual piston chamber 2 and motive fluid ducts 3, 4. The piston head is denoted by 5 and its forwardly extended rod by 6,which rod is provided with a chuck 7 at its forward end for the attachment of the hollow drill steel 8. The bore of the hollow drill steel 8 is denoted by 9.

Th'e piston rod 6 is provided with a duct 10 therein which, in the present instance, is formed by a hole drilled from the front end of the iston rod to a point adjacent to the piston liead. This duct 10 in the piston rod 6 is provided with a port 11 opening to the periphery of the said rod.

The front head is denoted by 12 and may be of any well known and approved form. This front head is provided with a sleeve 13 which su'rroundsV the piston rod 6. This sleeve has its inner wall cut away to form an inner annular space 14 and its outer wall cut away lto form an outer annular space 15. These two spaces are in open communication through holes 16 thereby forming a Water feed chamber. The outer annular space 15 .comes worn out.

of the water feed chamber is in open communication through ducts 17 with a water inlet pipe 18 connected to any suitable source' of water supply not shown herein.

' By providing the outer annular space 15 in the sleeve 13, it will be seen that the water feed chamber is always in communication with the ducts v17 irrespective of the rotary position in which the sleeve 13 is inserted into its place within the front head. This inlet pipe 18 may be provided with a cock 19.

The piston rod is packed in the front head against leakage of au' pressure and water, as follows :-The sleeve 13 at its inner end is packed by two reverse cup-leathers 20 engaging the periphery of the piston rod 6. The outer end of the sleeve 13 is provided with a U-shaped washer 21 whereby the inner and outer walls of the sleeve are packed. A stuling box 22 may also be employed in the front head as an additional safeguard against the leakage of water around the piston rod.

To prevent the leakage of water at the chuck end of the piston rod, a rubber gasket 23 is inserted at the rear of the bushing 24, the opening in the chuck for the gasket 23 being less in diameter than the opening for the bushing 24, thus leaving ashoulder 25 against which the inner end of the bushing seats.

The inner diameter ofthe gasket 23 is normally less than the outer diameter of the drill steel sothat when the drill steel is insorted into the chuck, it will expand the gasket thus making a water-tight joint at this oint.

, A ole 26 is bored in the chuck opposite the gasket 23 for the purpose of ermltting the withdrawal of the gasket 'wlien it beby pushing the gasket inwardly by a pin inserted intol the hole 26, when the drill steel is removed and then withdrawing the gasket with a hook inserted into the end of the chuck.

The duct 1 0 in the piston rod is enlarged at the drill steel seat in the chuck, as shown at 27, for preventing the duct from becoming closed by the burring over of the mouth of the duct.

The port 11 of the duct 10 in the piston rod is so located that it will be brought alternately into open communication with the outer and inner s ace 15 of the water feed chamber in the ont head and into open communication with the piston chamber 2 in front of the piston head 5. As a result of this arrangement it will be seen that when the port l l is in open communication with the water feed chamber in the front head, water will be fed through the duct 10 in the piston rod and the bore 9 of the hollow drill steel to the face of the drill.

As the piston head 5 is-moved rearwardly the port 1l is first cut off from communication with the water feed chamber in the front head and is then brought into o en communication with the piston chamllier This will serve to ermit the air to' escape to the face of the dril steel through the port l1, duct l0 and bore 9 'thus forcing the water out of the hole being cut by the drill steel and also thoroughly cleansing the hole of the cuttings, the water serving also to lay any dust that the drill steel may make when striking the rock.

As the port 11 is in communication with the Water feedchamber for a small portion of each stroke, the amount of water used will be very small. It is to be understood that the water may be furnished under the desired pressure to produce the proper result. It is also to be understood that the port 11 is in communication with the piston chamber for only a small portion of-each stroke as the piston head is near the limit of its rearward movement.

What I claim is 1. A cylinder, a front head, a hollow drill steel, a water feed'chamber, a separate air lsupply chamber, and a reciprocating drill piston having a duct therein vrarranged to be brought alternatelyinto communication with the water feed chamber and the air supply chamber for feeding water and air alternately to the drill steel.

2. A cylinder, its piston chamber, a front head, a water feed chamber therein, a hollow drill steel andareciprocating drill iston having a duct therein arranged to lebrought alternately into communication with the water feed chamber and the piston chamber for feeding water and air alternately to the drill steel. i

3. A cylinder, its piston chamber, a front head, a sleeve therein having inner and outer connected annular spacesforming a water feed chamber, a hollow drill rsteel and a revdrill piston having a duct therein arranged to be .broughtA alternately into communication with the water feed chamber and piston chamber for feeding waterand air alternately to the drill steel, a packing for the pistpn rod at the inner endof the sleeve and a packing for the piston rod and sleeve at the outer end of the sleeve.

5. A hollow drill steel, a piston rod having aduct therein communicating with the bore of the drill steel,a chuck for receiving the drill steel, a bushingand a gasket at the inner end of the bushing arranged to encircle the end of the drill steel for forming a water-tight joint at the drill steel seat, the o ening in the chuck for the gasket being of ess diameter than the o ening for the bushing, thus forming a shou der against which the inner end of the bushing seats.'

6. A hollow drill steel, a piston rod having a duct therein communicating with the bore ofthe drill steel, a chuck for receiving the drill steel and a gasket located at they drill steel seat arranged to encircle the end of the drill steel to form a water tight joint,the said chuck having a transverse hole leading to the gasket for facilitating its removal from the chuck.

7. A hollow drill steel, a piston ro'd having a duct therein communicating with the bore of the drill steel, a chuck for .receiving the drill steel, a bushing and a gasket located at the inner end of the bushing in position to encircle the end of the drill steel at its seat, said chuck having a transverse hole leading to the gasket for facilitating the removal of the gasket from the chuck.

In testimony, that I claim the foregoing as my invention, I have signed ,my name in presence of two witnesses, this fourteenth day of April 1906. y

WILLIAM PRELLWITZ. Witnesses:

WARD RAYMOND, CHASL C. HANSEN.

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