US2039311A - Rock drill - Google Patents

Description

E. G. GARTIN ROCK DRILL May 5, 1936.

Filed March 6, 1934 Patented May 5, 1936 UNITED STATES PATENT OFFICE ROCK DRILL Elmer G. Gartin, Claremont, N. H., assignor to Sullivan Machinery Company, a corporation of Massachusetts Application March 6, 1934, Serial No. 714,316

16 Claims.

This invention relates to rock drills, and more particularly to improvements in the feeding mechanism of a rock drill of the mounted drifter type.

An object of this invention is to provide an improved rock drill feeding mechanism. Another object is to provide an improved pneumatic feeding mechanism for a rock drill of the mounted drifter type. A further object is to provide an improved drill mounting structure for such a drill and improved means for controlling the flow of pressure fluid to the drill. These and other objects will, however, hereinafter more fully appear.

In the accompanying drawing there is shown for purposes of illustration one form which the invention may assume in practice.

In this drawing,

Fig. 1 is a side elevational view, with parts in longitudinal section, of the illustrative embodiment of the improved rock drill.

Fig. 2 is a cross sectional View taken substantially on line 22 of Fig. 1.

Fig. 3 is an enlarged cross sectional View taken substantially on line 3-3 of Fig. 1.

Fig. 4 is a sectional view taken in the plane of line 4-4 of Fig. 3 showing the different positions of the controlling valve.

Fig. 5 is a sectional view taken on line 5-5 of Fig. 3, showing several valve positions.

- Fig. 6 is a sectional view taken in the plane of line 6-6 of Fig. 3, showing several valve positions.

In this illustrative construction there is shown 35 a rock drill of the mounted drifter type generally comprising a guide shell I, a pneumatic feeding mechanism 2 and a hammer motor 3.

The guide shell I comprises an elongated structural steel element 4 of T-shaped cross- 40 section, and secured to the depending flange of the T is a swivel plate 5 having a longitudinal slot 6 for receiving the flange and rigidly secured to the flange by transverse bolts I. Arranged directly above the guide shell in parallelism therewith is a reciprocable feed cylinder 8 having a bore 9 for receiving a relatively stationary feed piston I0, and this cylinder has front and rear heads II and I2. These feed cylinder heads II and I2 are provided with lateral guideways I3, I3 engaging the lateral edges of the top plane surface of the structural steel element 4 of the guide shell. The element I2 forms the rear head block for the cylinder I4 of the hammer motor 3, while the front head I I is provided with a socket I 5 for receiving the forward portion of the chuck housing I6 of the hammer motor, this element II having an opening I! through which a drill steel I8 mounted within the chuck housing I6 extends in the manner shown in Fig. 1. The hammer motor 3 comprises a usual fluid actuated hammer piston for delivering impact blows to the shank of the drill steel I8, and as the structure of this hammer motor is well known and of a standard design, further description thereof is considered unnecessary.

The hammer motor 3 and the feed cylinder 8 secured to the front and rear heads I I, I2 slide as a unit longitudinally along the guides of the guide shell during feeding of the drill steel during the drilling operation, while the feed piston I6 is maintained stationary with respect to the guide shell; and the means for holding the feed piston in such stationary position comprises an elongated shell brace rod 20 extending centrally through a central bore 2i formed in the feed piston and threadedly secured at its ends within pedestals or brackets 22, 22 secured to the opposite extremities of the guide shell, this rod being rigidly held in position by nuts 23, 23. Interposed between the pedestals 22, 22 and the opposite faces of the feed piston I0 and surrounding the rod 20 are spacing sleeves 24 and 25, these spacing sleeves engaging the pedestals and feed piston rigidly to hold the latter against movement in an axial direction longitudinally of the shell. These spacing sleeves which might be termed oppositely extending stationary piston rods, extend through stufling boxes 26, 26 carried within the front and rear heads II and I2; and these stufling boxes have packings snugly embracing the outer peripheries of the spacing sleeves to prevent leakage of pressure fluid from the ends of the feed cylinder.

Now referring to the improved valve means for controlling the flow of pressure fluid to the drill, it will be noted that arranged within a transverse bore 36 formed in the rear head block I2 is a conical-shape valve 3! having a manual operating lever 32. Secured at 33 to the head block is a pipe connection 34 for supplying pressure fluid from any suitable source to the interior of the valve 3| which is herein made hollow at 35. As shown in Fig. 3, leading from the valve bore 30 to the front and rear ends of the feed cylinder are fluid supply passages 36 and 31, the passage 31 being formed in the head block, and as shown in Fig. 1, communicating directly with the rear end of the feed cylinder while the passage 36 is formed in the head block and the wall of the feed cylinder and communicates with the forward end of the latter, as is also shown in Fig. 1. Also formed in the rear head block [2 is a passage 38 leading to the supply chamber of the hammer motor 3. Pressure fluid may be supplied to this passage from the valve 3| through a passage 39 formed in the wall of the valve. For supplying pressure fluid from the interior of the valve to the forward feed passage 36 there is formed on the exterior periphery of the valve a circumferentially extending groove 40 connected to the interior of the valve by a port 4| formed in the valve wall and communicable with the passage 36. For connecting the forward feed passage 36 to exhaust there is formed on the exterior of the valve in the same transverse plane as the groove 40, a circumferentially extending groove 42 communicable with a vent port 43 formed in the head block. For supplying pressure fluid from the interior of the valve to the reverse feed passage 3'! there is formed on the exterior periphery of the valve a circumferentially extending groove 44 connected to the interior of the valve by a port 45 formed in the valve wall, and this groove is communicable with the passage 31. For venting the reverse feed passage 31 to atmosphere there is formed on the exterior periphery of the valve in the same transverse plane as the groove 44, a circumferentially extending groove 46 communicable with a vent port 41 formed in the head block.

When the valve is in the position a shown in Figs. 4, 5 and 6, pressure fluid flows through the supply connection 34 and the interior of the valve through port 4| and groove 40 to the forward feed passage 36, the pressure fluid flowing through the passage 36 to the forward end of the feed cylinder in advance of the feed piston, thereby causing the drilling motor to be fed forwardly longitudinally along the guide shell. As the drill is fed forwardly when the valve is in this position, pressure fluid is at the same time supplied from the interior of the valve through port 39 to the motor supply passage 38, thereby causing full speed actuation of the hammer piston. During forward feeding of the hammer motor, the reverse feed passage 3! is connected to exhaust through the groove 46 and vent port 41. When the valve 3| is rotated into the position shown at b in Figs. 4, 5 and 6, the flow of pressure fluid from the interior of the valve to the feed passages 36 and 31 is cut off, while the port 39 for supplying pressure fluid to the motor passage 38 is full on, and as a result the drill steel is ac tuated by the hammer motor while the latter remains stationary with respect to longitudinal feeding movement along the guide shell. When the throttle valve is turned into the position 0 shown in Figs. 4, 5 and 6, pressure fluid is supplied from the interior of the valve through the port 45 and groove 44 to the reverse feed passage 3l, while the forward feed passage 36 is connected to exhaust through the groove 42 and vent port 43, and as a result, the hammer motor is fed rearwardly along the guide shell. At this time the hammer motor is relatively slowly actuated by partial communication of the port 39 with the motor supply passage 38. When the throttle valve is rotated in the position (2 shown in Figs. 4, 5 and 6 the supply of pressure fluid to the feed passages 36 and 31 and the motor supply passage 38 is entirely cut ofi, the valve at that time being in its neutral or closed position with the entire drill shut down.

As a result of this invention, it will be noted that an improved feeding mechanism is provided for a rock drill of the drifter type having improved controlling means whereby the drill is fed and controlled in an improved manner. It will further be noted that by mounting the stationary feed piston in the manner disclosed on the guide shell, an improved reversible pneumatic feed is provided which is of an extremely rugged design and wherein leakage of pressure fluid from the feed cylinder is reduced to a minimum. Further, by arranging the feeding parts in the manner disclosed, the fluid supply means for the feed cylinder is substantially simplified. These and other uses and advantages of the improved rock drill will be clearly apparent to those skilled in the art.

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a rock drill, a guide shell, a drilling motor mounted thereon, and means for feeding the drilling motor along the guide shell including a shell brace rod secured at its ends to the opposite extremities of the guide shell, a feed piston mounted on said brace rod and held against axial movement relative thereto, a feed cylinder containing said piston and slidably guided on said guide shell, said feed cylinder having portions adjacent each end thereof guidingly engaged by said shell in all positions along the latter, and means for attaching the drilling motor to the feed cylinder.

2. In a rock drill, an elongated guide shell having upstanding supports at its opposite extremities, a shell brace rod extending longitudinally of the guide shell and secured at its ends to said supports, a feed piston mounted on said brace rod, spacing sleeves interposed between said piston and said supports and surrounding said rod and holding said piston against axial movement in longitudinal direction relative to said rod, a feed cylinder containing said piston and guided on said shell and having heads slidingly cooperating with said sleeves, and means for attaching a drill steel hammer motor to said cylinder.

3. In a rock drill, an elongated guide shell, a feed cylinder having front and rear heads, said heads having guideways slidably engaging the sides of the guide shell, said cylinder being supported on the guide shell solely by said heads, a stationary feed piston contained in said cylinder and secured against movement in a longitudinal direction relative to the shell, and means for attaching a drill steel hammer motor to said cylinder heads independently of said cylinder.

4. In a rock drill, an elongated guide shell formed of a structural steel element of T-shaped cross section, a supporting swivel secured to the depending flange of the T of said guide shell element, a feed cylinder extending longitudinally of said shell and guided for longitudinal movement therealong, said cylinder having front and rear heads having guideways receiving the lateral edges of the plane top flange of the T of the guide shell element for slidably supporting the feed cylinder out of direct contact with said shell, and a drill steel hammer motor carried by said feed cylinder heads independently of said feed cylinder.

5. In a rock drill. an elongated guide shell, a

stationary feed piston having oppositely extending piston rod means secured at its ends to the opposite extremities of the guide shell and forming shell bracing means, a feed cylinder having front and rear heads, said heads having stufling boxes through which said feed piston rod means extend, said feed cylinder being guided for longitudinal movement along said guide shell, and a drill steel hammer motor mounted for movement longitudinally with said feed cylinder and having its extreme opposite ends connected to said feed cylinder heads.

6. In a rock drill, an elongated guide shell, a stationary feed piston having oppositely extending piston rod means secured at its opposite ends to the opposite extremities of the guide shell and forming shell bracing means, a feed cylinder having front and rear heads guided on said guide shell, said heads carrying stufiing boxes through which said piston rod means extend, and a drill steel hammer motor mounted on said feed cylinder for longitudinal movement therewith relative to the guide shell.

'7. In a rock drill, a guide shell, a pneumatic feed cylinder guided for longitudinal movement along said shell, a feed piston contained in said cylinder and held against axial movement with respect to said shell, said feed piston having equal opposed pressure areas, a pressure fluid actuated hammer motor mounted on and movable with said cylinder, and means carried by said hammer motor for controlling the flow of motive fluid to said hammer motor and said feed cylinder.

8. In a rock drill, an elongated guide shell formed of a structural steel element of T-shaped cross section, a supporting swivel secured to the depending flange of the T of said guide shell element to provide for adjustment about an axis perpendicular to the plane of the top of said T, and a drilling motor guided on said shell element and having guiding means receiving the lateral edges of the plane top flange of the T of said guide shell element.

9. In a rock drill, an elongated guide shell formed of a structural steel element of T-shaped cross section, a supporting swivel secured to the depending flange of the T of said guide shell element, a drilling motor guided on said shell element and having guiding means receiving the lateral edges of the plane top flange of the T of said guide shell element, and means extending between the ends of said guide shell element and arranged parallel with the top plane surface thereof and spaced above the latter for bracing said guide shell element.

10. In a rock drill, an elongated guide shell formed of a structural steel element of T-shaped cross section, a supporting swivel secured to the depending flange of the T of said guide shell element, a drilling motor guided on said shell element and having guiding means receiving the lateral edges of the plane top flange of the T of said guide shell element, means extending between the ends of said guide shell element and arranged parallel with and above the top plane surface thereof for bracing said guide shell element, and means for feeding said drilling motor with respect to said shell element comprising a feed cylinder movable longitudinally of said shell element and a stationary feed piston contained in said cylinder and secured to said shell bracing means.

11. In a rock drill, an elongated shell element having parallel guideways, separate means extending between the ends of and arranged parallel with but spaced from the shell guideways for bracing said shell element, a drilling motor guided on the shell guideways, and means for feeding said motor longitudinally with respect to said shell guideways including a feed cylinder movable longitudinally of said shell element, and a stationary feed piston contained in said feed cylinder and secured to said shell bracing means.

12. In a rock drill, an elongated guide shell element having parallel guideways, structurally distinct means extending between the ends of and arranged parallel with but spaced from the shell guideways for bracing said shell element, a drilling motor guided on the shell guideways, and means for feeding said motor longitudinally with respect to the shell guideways including a feed cylinder movable longitudinally of said shell, a stationary feed piston contained in said cylinder and mounted on said shell bracing means, feed piston positioning and piston rod forming means comprising sleeves mounted on said bracing means, and packed heads on said feed cylinder through which the piston rod sleeves extend.

13. In a rock drill, an elongated guide shell element having parallel guideways, a rod extending between the ends of and arranged parallel ith the shell guideways for bracing said shell element, a drilling motor guided on the shell guideways and by said rod, and means for feeding said motor longitudinally with respect to the shell guideways including a feed cylinder movable longitudinally of said shell, a stationary feed piston contained in said cylinder and mounted on said shell bracing rod, feed piston positioning and piston rod forming means comprising sleeves mounted on said bracing rod, and packed heads on said feed cylinder through which the piston rod sleeves extend.

14. In a rock drilling apparatus, an elongated guide shell, a feed cylinder supported on and guided by said guide shell, said feed cylinder having heads, and means for attaching a hammer drill motor to said cylinder heads independently of the cylinder.

15. In a rock drilling apparatus, an elongated guide shell, a feed cylinder having heads by which it is supported and guided on said guide shell, and a hammer drill supported by the heads of said feed cylinder independently of the cylinder itself.

16. In a rock drill, a guide shell having a brace rod extending parallel to said shell and secured at its opposite ends to the opposite extremities of the guide shell, a feed piston mounted on said rod substantially midway of the length thereof, a feed cylinder surrounding said piston and having heads having portions slidably cooperating with said guide shell, and a drilling motor carried by said feed cylinder and having its rear head formed integral with one head of said cylinder, and said motor having a chuck housing at its other end, and said other feed cylinder head having a recess receiving the chuck housing of said drill.

ELMER G. GARTIN.

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