US1192657A - Drill-operating mechanism. - Google Patents

Description

J. D. MACDONALD, DECD.

r. c. MACDONALD. ADMINISTRATOR.

DRILL OPERATING MECHANISM. APPLICATION-FILED JUNE 10, 19M. RENEWED UEC. 23,1915.

Patented July 2", 19 16.

2 SHEETS-SHEET I.

J. D. MACDONALD, DECD.

r. c. MACDONALD, ADMINISTRATOR.

DRILL OPERATING MECHANISM. APPLICATION HLED JUNE I0. 1911.

RENEWED DEC. 23. 1915.

Patented July 20, 1916.

2 SHEETS-SHEET 2.

JOSEPH D. MACDONALD, OF BUTTE, MONTANA; FRANK C. MACDONALD, ADMINIS- TRATOR OI? SAID JOSEPHD. MACDONALD, DECEASED, ASSIGNOR OF ONE-HALF TO CATHRINE MACDONALD AND ONE-HALF TO FRANK C. MACDONALD, BOTH OF SAN FRANCISCO, CALIFORNIA.

Specification of Letters Patent.

Patented July 25, 191%.

Application filed June 10, 1911, Serial No. 632,435. Renewed December 23, 1915. Serial No. 68,459.

To all whom it may concern:

Be it known that I, JOSEPH D. MAO- Dormno, a citizen of the United States, reslding at Butte, in the county of Silverbow and State of Montana, have invented. certain new and useful Improvements in Drill- Operating Mechanisms, of which the following is a specification.

My present invention pertains to an improved apparatus or mechanism for imparting an oscillating movement to the feed bar of a drill, and at the same time and through the same mechanism to moisten the compressed air which is fed to the drill or drill-hammer, the mechanism being operated by the compressed air.

The structure is illustrated in the annexed drawings, wherein:

Figure 1 is a perspective view of the mechanism; Fig. 2 a vertical sectional view, taken on the line 2-2 of Fig. 3, and looking in the direction of the arrow; Fi 3 a similar view, taken on the line 33 0 Fig. 2; and Fig. 4 is a detail sectional view illustrating the drill-bar or cylinder and the connections by which it is oscillated.

The main object of the present invention is to provide a' suitable mechanism which, through the use of compressed air or other pressure fluid, may be employed to oscillate a drill-bar, and also to provide means whereby the compressed air which is fed to the pneumatic hammer may be moistened to a greater or less extent, thereby preventing the blowing of dust out of the hole which is being drilled. The use of the moistened air is also advantageous in the operation of the drill when working upon various grades of material.

' The invention in its broadest sense may be said to comprise a power cylinder or engine which actuates the oscillating member that supports the drill-bar, and likewise actuates a force pump to aspirate water into the compressed air which is fed or passedonto the hammer.

Referring to the drawings, 1 denotes the power cylinder provided adjacent to its upper head 2 with a flanged extension or socket member 5, adapted .to coact with a sim lar member 6, to clamp and embrace the ordinary supporting bar 7 carried by a tripod or otherwise suitably supported.

. The cylinder 1, which in effect is the cylinder of the motor which operates the oscillating member and the aspirating pump, may contain a motor of any approved type, but for the purposes of illustration and as showing a construction which has actually been used and found eflicient, a description of the motor shown in Fig. 2 will now be given. It may be said to consist of a piston having two heads, 8 and 9, connected by a cylindrical member or stem 10,. in the upper end of which is secured a piston-rod 11, said rod extending through the head 2 and a packing gland 12 mounted thereon. The stem 10 is hollow and secured in the lower end thereof is an exhaust pipe 13, said pipe extending through a smilingbox 13 in the lower head of the cylinder. The stem is also provided with a lateral port 14. A channel 15 extends through the stem 10 from the upper end thereof down toward the lower head 8 and terminates in a lateral port 16, a second port, 17, likewise opening into said channel 15 at a point above the lower port 16. A similar channel 18 extends through the lower head 8 of the piston upwardly through the stem 10, terminating short of the upper head 9 and being provided with a. lateral port 19 and with a second lateral port 20, said ports 19 and 20 occupying the same relative positions to the channel 18 as do the ports 16 and 17 to the channel 15.

Mounted upon the stem 10 of the double piston is a spool-shaped valve having heads 21 and 22. The body of the spool, upon its inner face, or that which contacts with and slides over the stem 10, is provided with an elongated annular recess or chamber 23, and likewise with ports 24: upon opposite sides thereof, said ports opening into an internal circumferential groove or channel 25. Ports 26, located adjacent to the lower head 21 and occupying the same relation thereto as the ports '24 to the head 22, are formedin the body of the spool and open into an mternal circumferential groove or channel 27.

The compressed air for actuating the motor passesinto the same through a port '28 located at the midlength of the cylinder 1. The operation of the motor is as follows:

. Assuming that the parts are in the positions shown in Fig. 2, compressed air entering the port 28 passes in between the heads 9 and 22, thence through the port 19, down the channel 18 and below the lower head 8, the air acting upon the .under .face of the head 8 and against the fixed lower vhead of the cylinder and tending to force the piston and the valve upwardly. During this upward motion the air above the piston-head 9 will pass downwardly through the channel 15, out through the lateral port 17 into the chamber 23, thence'through the port 14 into th hollow stem 10 and through the exhaust pipe 13. The impetus of the parts will carry the valve-head 22 past the inlet-port 28 a d the air will then pass into the chamber ormed between. the heads 21 and 22 of the spool-shaped valve through the ports 24,

' into the channel 25, and thence through the port 20 into the ehannel 18, and the piston will continue its upward movement. When it reaches the limit of its upward travel, the valve will shift, owing to the impetus of the valve, and a reverse motion will be effected. At such time the head 21 of the valve will be separated from the head 8 and the a r will pass from the port 28 between said heads through the port 16 and upwardly above the head 9 of the piston, through the channel 15. So long as the air continues to pass into the port 28, or in other words, so long as .the flow of air is not interrupted, the motor will continue to act.

Secured to the upper face of the member 3 is a combined support and housing for the oscillating clamp or chuck in which the drillbar is mounted, which support and housing form a guide for the combined rack-bar and movable cylinder of the aspirating pump. Said combined support and'housing preferably takes the form of a rectangular boxi like member, 29, the rear wall of which .with a gear 32 keyed to sleeve 33.

forms a bearing for the rear face of the combined rack and cylinder 30. aid mem: her, as will be clearly seen upon reference to Fig. 2, is threaded on the upper end of the piston-rod 11, and is provided on its forward face with a rack 31, which meshes Said sleeve finds its bearing in laterally-extending hubs or extensions of the housing, designated by 34 and 35. A nut 36 is threaded upon one end of the sleeve (see Fig. 3) and bears against the outer end of the hub 35. The opposite end of the sleeve is provided with an enlarged head 37, the inner wall of which bears against the outer end of the hub 34. It will thus be seen that no endwise movement of the hub in its bearings cantake place and that the gear 32 will likewith the rack 31. The interior face of the head is threaded and two semicircular clamping plates 38, 39, externally threaded, are seated in said head and forced down wardly upon the drill-bar or cylinder 40 by suitable set- screws 41, 42. The threaded engagement of the clamping plates prevents longitudinal displacement thereof with reference to the head when the set-screws are loosened for the purpose of adjusting the drill-bar longitudinally therethrough.

Rigidly secured to the top 43 of the housing 29 is a hollow piston-rod 44, said rod extending through a stuffing-box 45 into the upper end of the cylinder 30.- Said hollow rod 44 is connected through a suitable coupling 46 with a pipe 47 which in turn is in communication with a pipe 48. Said pipe is connected with a water supply pipe 49 and a. check-valve 50 is interposed between said supply pipe and the pipe 48. A second check-valve 51 is likewise secured to the pipe 48 above the point of connection of the pipe 47, said check-valve working in a direction opposite to that of the check-valve 50. A- flexible pipe 52 (preferably a section of rub-- ber hose) extends from the check-valve around to a three-way coupling 53. i

The main air-supply pipe, leading from any suitable source of pressure, is designated by 54 andterminates in a three-way coupling 55, from which extends a pipe 56 con-' nected to the coupling 53, a valve 57, preferably a three-way valve, being located in said pipe 56. .A flexible pipe 58 extends from the coupling 53 to the rear end of the drill-bar or cylinder 40 and, as is usual in this class of machinery, opens into the end of the drillbar in rear of the piston 40 mounted therein, and to which piston is secured a hollow rod 40 to the outer end of which the engine or hammer 40 is directly connected. Said hammer is preferably of the type shown in my copending application Serial No. 616,199, filed on or about March 22nd, 1911, and the air which is forced into said bar passes through the rod and through the ports formed in the hammer and thence through the openings in the drill 40 to the bottom of the hole which is being made by the drill: A pipe 59 extends downwardly from the coupling 55 and is connected with a pipe 60 mounted in the casing and in themember 3, said pipe opening into the port 28. A threeway valve 61 will preferably be placed in the pipe 59. The water pipe 49 will terminate in a tank or any other supply of water. The action of the apparatus is as follows:

Assuming that the motor has drawn the I wise be held in its proper position in mesh 47, coupling 46, piston-rod 44 and into the cylinder, as the motor moves the rod 11 upwardly it carries the combined cylinder and rack with it, thereby rotating the gear 32 and consequently rotating the drill-bar or cylinder 40. At the same time, the water will be forced out of the cylindrical member 30, through the rod 44, coupling 46, pipe 47, and upwardly past the check valve 51 which is then raised from its seat, the checkvalve 50 being at such time forced to its seat to prevent retrograde movement of the water. The water which is forced out past the check-\alve 51 will pass through the pipe 52 and come into contact with the air which at that time is passing through the pipes hereinbeforc described, and will be carried along with the air through the pipe 58 into the drill-rod or dri1l-bar, through the motor or 1 engine, and discharged in an aspirated condition through the opening in the outer end of the drill, being thereby discharged into the bottom of the opening being formed. It will thus be seen that for each upward and downward movement of the rod 11, the rack will actuate the gear 32, and in turn oscillate the bar &0, and at the same time a quantity of water will be drawn in by the pump, comprising the cylindrical member 30 and the fixed piston-rod 44, and discharged into the air-line which lends to the hammer.

The amount of air which passes to the motor for the'drill may be regulated by manipulation of the valve 57, and the amount of air passing-to the motor may likewise be controlled by manipulation of the valve 61.

The motor may be lubricated by turning the valve 61 to such position as to cut oil the air-supply and open the valve outwardly through a port 62, at which time oil may be fed into the pipe 60, through which pipe it will pass by gravity into the motor.

' lVhen it is desired to oil the mechanism contained in the drill-bar and also the motor connected to the outer end of the drill-bar the valve 57 will be turned so as to cut oil the air-supply and to open the valve outwardly through a port 57, oil being introduced through said port into the pipe 56, whence it passes through the coupling 53, pipe 58, into the drill-bar and the parts carried thereby.

The attachment of the pipe 48 to the lower end of the pipe 4.7 is preferably made through a swivel connection, the construction shown being merely a T, threaded upon the lower end of the pipe 17 or the elbow carried thereby. This construction permits the machine as a whole to be placed at any inclination from the vertical about the bar 7, while maintaining the check valves 50 sired angle, this by reason of the fact that it may be swung about the supporting memher 7 and also be turned in the clamping members when said members are released.

Having thus described my invention, what I claim is:

1. In an apparatus of the character specified, the combination of a drill-bar; a pneumatic hammer carried thereby; an oscillating clamp for supporting said bar; an airline leading to the hammer; a pump adapted to force water'into said air-line; and a motor for actuating the pump and oscillating the clamp.

2. In an apparatus of the character specified, the combination of a drill-bar; a pneumatic hammer carried thereby; an oscillating clamp for supporting the drill-bar; an

air-line leading to the hammer; a pump adapted to force water into the air-line; a motor for actuating the pump and oscillating the clamp; and means for securing the mechanism as a unitary structure upon a suitable support.

3. In an apparatus of the character specified. thecombination of a drill-bar; a pneumatic hammer carried thereby; an oscillating clamp supporting and clamping said bar; and a motor for imparting motion to said clamp.

4. In an apparatus of the character specified, the combination of a drill-bar; a pneumatic hammer carried thereby; an osci1lat ing clamp for supporting said bar and through which it maybelongitudinally ad justed; an air-line leading to the hammer; a pump for forcing water 'into the air-line of the hammer; and a motor for actuating the pump and oscillating the clamp.

5. In an apparatus of the character specified; the combination of a suitable housing; an oscillating drillbar clamp; a drill-bar mounted in said clamp; a pneumatic hammer carried by said bar; an airline leading to the hammer; a pump likewise supported by the housing and discharging water into the air-line leading to the hammer; and a motor secured to the housing and actuating the clamp and pump.

6. In an apparatus of the character specitied, the combination of a suitable housing; an oscillating drill-bar clamp mounted therein; a drill-bar carried by the clamp; a pneumatic hammer carried by the bar; an

air line leading to the hammer; a motor ling the inlet and exhaust of water to and from the pump formed by the piston and rack-bar, the exhaust terminating in the airline leading to the hammer.

7. In an apparatus of the character specified, the combination ofasuitable housing;-

a drill-bar clamp carried'thereby; a drillbar; a pneumatiq hammer carried by the bar; an air-line leading to the hammer; a motor secured to the housing; a pump mounted in the housing; connections intermediate the motor, the clamp and the pump; and a Valve mechanism swiveled upon the housing and serving to control the flow of 10 water into and from the pump, the pump exhaust terminating in the air-line leading to the pneumatic hammer.

In testimony whereof -I have signed my name to this specification in the presence of two subscribing Witnesses.

JOSEPH D. MACDONALD.

VVitnessesz- C. F. CHAPIN, M10. 0. OALLAHAN.

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