US1099994A - Pneumatic rock-drill. - Google Patents

Description

G. A. ORR.

PNEUMATIC ROCK DRILL.

APPLICATION FILED JUNE 14, 1913.

1,099,994. Patented June 16,1914.

2 sums-sum 1.

WW /////////IIIIIIIIIII 11 lNVENTOR ATTO R N E Y G. A. ORR.

PNEUMATIC ROCK DRILL.

APPLICATION FILED JUNE 14, 1913.

1,099,994, Patented June 16,1914.

F, 5 2 SHEETS-SHEET '2.

42 4 L w v 1 [MI 1 I WITNESSES 07 INVENTOR ATTO R N EY GAYLORD A. ORR, OF CBIPPLE CREEK, COLORADO.

- PNEUMATIC ROCK-DRILL.

Specifleaflonof Letters Ijatent.

Patented June 16, 1914.

Application filed June 14, 1913. Serial No. 773,717.

To all who-m. it may concern lie it known that I, GAYLORD A. ORR, a

citizen of the United States, residing at ilripplc Creek, in the county of Teller and State of Colorado, have invented a new and useful Pneun'iatic Rock-Drill, of .wlnch the I following is a specification.

This invention has reference to improvements in pneumatic rock drills, and more particularly is directedto a cut-off means, the object of which is to prevent damage due to the breaking of the drill steel.

The invention is also particularly applicable to the type of rock drills knownas stopers.

In the class of rock drills to which this invention is particularly applicable there is a liability should the drill steel or tool break while in action for the device to jump, since there is nothing then to hold it down. With the present invention should-a drill steel or tool become broken, the distance which the tappet of the device then travels results in an increased movement thereof which in turn causes the release of a valve changing the course of air in the device in a manner resulting in the automatic diverting of the compressed air stream to the atmosphere and away from the tappet and feed piston, whereupon the device collapses if upright. or in some other position ceases to feed. and no harm results.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming a part of this specification. with the further understanding that while the drawings showa practical form of the invention. the latter is not confined to any strict conformity with the showing of the drawings. but may be changed and modified so long as. such changes and modifications mark no material departure from the salient features of the invention.

In the drawings: Figure 1 is an elevation of a stoper with the invention applied. Fig.

2 is an elevation similar to Fig. 1 but. viewed at approximately right angles to Fig. 1.. Fig. 3 is a section on the line 3 -3 of Fig. 1. Fig. 4 is a section on the line 4-4 of Fig. 3. Fig. 5 is a detail section on the line 5-5 of Fig. 2, and drawn on a larger scale. Fig. 6 is asection similar to Fig. 5 but. showing a different, plume of operation. Fig. 7 is a bottom plan view of a valve structure shown in Fig. 5 and forming part of the present invention. Fig. 8 is an elevation'of another valve forming part of the present invention and viewed from the sidevof the valve directed toward the stoper. Fig. 9 IS a section on the line 9-9 of Fig. 8 but drawn on a larger-scale. Fig. 10 1s a sec-- tion on the line I10-10 of Fig. 9. Fig. 11 is a section on the line 1111 of Fig. 10. Fig. 12 is a section on the line 12-12 of Fi 11. Referring to the drawings, there is s own a stoper of commercial construction comprising a cylinder 1 in which is lodged a piston 2, see Fig. 5, movable in the cylinder to strike one end of an anvil block 3, see Figs. 5 and G, which latter is seated in a cylinder bushing 4 and is movable into a front head 5 having a bore 6 for a drill steel 7 see Figs. 1 and 2. The anvil 3 has a. stem 8 of smaller diameter than the head of the anvil, and which stem is in the path of the piston 2. The cylindeixat the end remote from the front head 5 is made fast to a valve chest 9 and the latter has fast to it a feed cylinder 10 in which there is mounted a feed piston rod 11 terminating at one end in a piston 12 within the cylinder 10 and at the other end in a feed tail piece 13 exterior to the cylinder 10..

The various structures so far-described constitute parts of a known type of stoper and are only mentioned in order that the operation of the attachment constituting the present invention may be understood.

There is provided a valve chest 14 in which there is formed a valve chamber 15 having a valve 16 lodged therein. From one face of this valve chest there projects a screw nipple 17 adapted to a threaded passage through an appropriate portion of the walls oft-he front head 5 and the bushing 4 opposite the head of the anvil This nipple 17 is traversed by a valve stem 18 carrying the valve 16, and at the end remote from the valve is normally in engagement with the head of the anvil 3 at one side is against the head of the anvil 3 thevalve 1.6 is located between the pipes 20 and 21, thus closing them from communication one with the other. The parts are so related that should the anvil '3 move toward the bore 6 until seated against the front head 5, then the head of the anvil will no longer be in the path of the valve stem 18 and the latter may move until engaging the anvil stem 8, the extent of movement being suflicient to'carry the valve 16 from its intermediate position between the p'ipes' 20 and 21 to the end of the chamber remote from the plug 19, thus putting the two pipes and 21 in free communication for a purpose which will hereinafter appear.

The valve chest 9 has an inlet portion 22 and to this there is joined by a nipple or pipe 23 a valve chest 24, the pipe or nipple 23 connecting with one end of a through passage'25in the valve chest 24, the other end of the passage25 receiving one end of a hose 26 through which compressed air may be directed to the stoper. Traversing the valve chest 24 is a valve 27 which may be in the form of a plug or spigot valve suitably ground and seated in the valve chest or block 24 and provided with a port 28 which may be moved into coincidence with the passage 25 to open the latter from end to end or may be moved out of coincidence with thepassage 25, whereupon the valve plug 27 closes the passage 25. Extending through the valve chest 24 to one side of the passage 25 and in substantially the same direction is another passage 29 also traversed 1 to is another passage 33 connected by, a pipe 34 to the interior of the cylinder 10 adjacent to the piston 12, and between the same and a feed passage 35 leading from the valve chamber 9 to the cylinder 10.

The pipe 20 connects with a passage 36 in the valve chest 24 leading to an arm 37 fast to the valve 27 in a passage or chamber 38 within the valve casing 24, this chamber being conveniently formed in a plate 39 inset into the valve casing 24 and held therein by bolts 40 or otherwise. One end 41 of the valve plu or spigot'27 projects beyond the face of t e casing 24 and there carries a manipulating handle 42, by means of which the valve may be turned for a distance of about 90, the turning movement being limited by the engagement of the arm 37 5 with one end or the other of the chamber 38.

by the valve plug 27, and this valve plug has and 21. Furt ermore, the valve 27 is turned a so thatthe port 28 is in position to 0 en the passage 25 and, therefore, air from e hose 26' has free access to the interior of the valve casing 9 and its action may be controlled therein in the usual manner which need not be described. Under these circumstances the passage 29 is closed by the valve plug 27 for in this position of the parts the port 30 is at right angles to the assa'ge 29 and the valve plug 27 therefore lanks the passage 29. The portion of the valve chamber 15 communicating with the pipe 21 is in free communication at all times with the end 32 of the passage 29 and thesame portion of the passage 29 is at all times in free communication by the pipe 34 with ,the interior of the feed cylinder 10v adjacent the piston 12, but air cannot find escape from the pasage 29 because of the intermediate or cut off position of the valve 16.

With the parts situated as described, air may enter the stoper under the control of the usual valves and operate the piston 2 to deliver asuccession of blows to the anvil 3 and from the latter to the tool or drill steel, which is held against the work by air pressure within the feed cylinder 10 exerted against the feed tail piece 13. The stoper therefore operates in the normal manner the drilling proceeding. because of the succession of blows delivered by the piston'2, and as the material is cut away the drill is constantly fed to the work by the feed piston 12 and tail piece 13.

While the operation of the stoper continues in the normal manner the devices of the present invention remain inactive. Suppose, however, that a drill steel breaks. Now, there is nothing to resist the air pressure upon the piston 12 and the stoper receives a rapid succes-ion of impulses tending to drive the tail piece 13 away from the cylinder 10 and the drill end of the stoper toward the work and the sudden series of unexpected shocks and jars may prevent the operator from turning off the air and injury to the operator may result- To pre vent this contingency is the purpose of the present invention. s soon as the tool steel breaks and therefore opposition to the anvil 3 ceases, the first blow of the iston 2 will drive the anvil to the forwar limit of its travel, thus moving the head of the anvil beyond engaging relation with the valve stem, 18 and the air pressure within the chamber 15 due to air pressure already with-- in the pipe 21 drives the piston 16 toward the anvil until the valve stem 18 engages the anvil stem 8 or the valve engages the corresponding end wall of the chamber 15.

This places the pipes 21 and 20 in direct communication and the full air pressure present in the pipe 21 is at once established in the pipe 20 and from the latter is exerted through the passage 36 on the arm 37 and as the only resistance that the arm 37 offers to this pressure is due to the frictional engagement of the valve plug 27 with the Walls in which it is seated, the valve is turned with great rapidity upon its longitudinal axis, thus moving the port 28 out of coincidence with the passage 25 and cutting off the air supply to the stoper and at the same time opening the passage 29 to the atmosphere through the port 30 and open end 31 of the passage 29. Now the pipes 34; and 21 communicating with the passage 29 are freely open to the atmosphere and the air pressure established in the pipes 20 and 21 and within the cylinder 10, as well as within the valve chest-9 is all relieved, since all these parts are open to the atmosphere, whereupon there is no longer any tendency to operate any part of the stoper, and it becomes quiescent, the whole cut out operation taking but a small fraction of time. Since there is no longer air pressure within the device, the valve 16 is readily moved to carry the stem'lS out of the path of the head of the anvil and the latter may be allowed to gravitate to its first position or may be readily moved thereby by any implement, introduced into the bore '6. As soon as air pressure is again established 1n the pipe 21, the valve 16 is held in the intermediate position between the pipes 20 and 21, thus cutting off communication be- Considering that the main tween them. valve of the stoper has in the meantime been closed, the valve 27 is readily turned to the first position, opening the means ofthe handle 42, so t at the drill is in condition to be again operated in the ordinary manner, but at the same time is in condition to take care of any breaks which may occur in the drill steel.

What is claimed is 1. A pneumatic drilling machine provided with a drill engaging anvil having a limited range of movement, a cut-off valve for the main air supply, and a controlling valve for the cut-off valve separate from and provided with means in the path of the anvil for holding the controlling valve in the inactive position during the normal Working movements of the anvil.

2. In a pneumatic rock drill provided with a tool engaging anvil having a limited range of movement and a pneumatically operated feed mechanism, a pneumatically operated valve structure arranged for interposition in the air supply duct of the drill, another assage 25, by

valve structure having connections with the first-named valve structure for controlling the operation of the valve therein to cut-01f the main air supply, and means in the second-named valve structure controlled by the movement of the anvil to in turn control the first-named valve structure,

3. In a pneumatic rock drill having a movable tool actuating anvil, pneumatically operated means for automatically controlling the flow of air to the drill operating means, and a valve structure for in turn controlling the air controlling means, said valve structure comprising a valve casing with inlet and outlet ducts connected to the air controlling means, and a valve in the valve casing movable into interposing relation to the ducts and out of interposing relation thereto" and having a valve stem of a length to be engaged by the anvil when the latter is in normal operative position to hold the valve in interposing relation to the ducts.

4. In a pneumatic rock drill provided with a movable tool operating anvil, automatic cut ofl meansfor controlling the air supply, and means for in turn cont-rolling the cut off comprising a valve casing having a nipple at one end adapted to be connected to the rock drill adj accnt to the anvil, spaced ducts leading from the valve casing to the cut oil means, and a valve Within the casing movable into and out of intermediate relation to the ducts and provided with a valve stem extending through the nipple and of a length to engage the anvil when the latter is in normal operative position to hold the valve in the intermediate position between the ducts.

5. In a pneumatic rock drill, a cut off member comprising a valve casing having passages thcrethrough, one of which is ar- 'passages, connections between the valve casing and one of its passages and the feed side of the drill, said casing also being provided with pneumatic valve operating means responsive to air pressure, and a controlling means communicating with the pneumatically operated means for the valve and said controlling means being in turn controlled by the anvil of the drill.

6. In a pneumatic drill provided with a tool operating anvil and a pneumatically operated feed, a cut-off valve controlling the.

air supply of the drill, pneumatic operating means 'for the cut-off valve, and a valve structure separate from and provided with means in the path of the anvil for holding the said valve structure in the inactive position during the normal working movements of the anvil.

7. In a pneumatic rock drill provided with a tool actuating anvil having a range of movement, and a pneumatic feeding mechanisin, a valve structure provided with a duct adapted to be interposed in the air supplyduct of the drill, another duct open at one end to the atmos here, a valve with ports therein for both uc ts and movable to open one. duct and close the other, a connection between the second named duct and the pneumatic feeding means for .the drill, a pneumatic actuating means for the valve, another valve structure provided with spaced ducts leading to the valve operating means and to the second named duct drill having an anvil capable of limited movement, comprising a cut-off valve structure provided with means for attachment to the rock drill in interposing relation to the compressed air course to the drill, and another valve structure for controlling the first-named valve structure and provided with means for attachment to the rock drill adjacent to the anvil thereof and also provided with a device located with respect to the anvil to be normally engaged thereby and to respond to an abnormal movement of the anvil for causing the actuation of the cut-ofi valve structure.

In testimony, that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two witnesses.

GAYLORD A. ORR.

Witnesses:

C. A. VANATTA, W. J. Forms.

Images