US2258995A - Drilling mechanism - Google Patents

Description

Oct. 14, 1941. F. MILLER DRILLING MECHANISM Filed March 23, 1940 w n ma M N E4 w a M Y B H 5 E 9 7 7 [Hum IWNJQ 7 5 t 9 1 5 L a W i u 1 1 I h M0 5 M0 7 a u 5 MW 3 u 75L! v ll, 1 r 2 5 3 HIS ATTORNEY- Patented Oct. 14, 1941 DRILLING MECHANISM W Frank Miller, East, )rang'e, N. J., assignoi to Ingersoll-Rand Company, New York, N. Y., a corporation of New Jersey Application March 23,1940, SerialNof325A85 I This invention relates to a rotary drilling apparatus, and more particularly, it relates-rtoa drilling apparatus-of the type employed in drillreg-wens, and [the like, ;whichform removable earthen. cores by cutting annular channels thereabou'tl ln the. operation of such. devices it is desirable to constantly-present a highlyabrasive cutting surface tothework'and to this end shot is constantly introduced into the hole while it is being drilled. Heretofore, the means employed forjntroducingthe shot has-been; complicated and; in-thenatureof an accessory that-had to be applied to the drill and. used insuch a manner that itv did not pass through or interfere with the'drilloperating mechanism. l i .It is, accordingly, an object of the-present inverition' toflprovide a shojtjfeedi'ng mechanism whi'chis integral withjthe drilling apparatus.

.An'OtheIf objectis to provide a drill shot feed'. ing mechanism which extends through moving parts of the drill.

pact and efiicientdrill shot feeding irnechanism;

Theseand other objects will be in 'part ob vious and in part pointed out in the following specification of which the drawing forms a part and in which similar reference numerals refer to similar parts. I

Figure 1 is a View in section of a drilling apparatus constructed and arranged in accordance It is a'fu-rther object to provide a simple, coniwith the principles of the present invention, and

Figure 2 is a transverse view taken along line 22 of Fig. 1;

With reference to Fig. 1, a rotary drilling apparatus constructed in accordance with the principles of the present invention is generally indicated at I and consists of a drill or cuttingtool 3 having a series of slots 5 (two of which are shown in dotted lines in Fig. l) to define the cutting teeth in the tool 3. Uponrotation of the tool 3 the cutting teeth out an annular kerf l in the earth formation severing the core 9 therefrom in order that'it may be removed to form a hole defined by the wall H. Within the tool 3 .is a transverse plate is rigidly secured thereto and below the transverse plate is abafiie plate l5 held in position by the bolts I! extending through both of the plates.

The transverse plate I3 is provided with a port [9 opening into the hollow shaft, or stem, 2|. The plate l3 and shaft 2| are fastened together by the flange coupling 23 which is se-,- cured on the transverse plate 13 by bolts 25 and is provided with threads 2'! to engage complementary threads provided on the shaft 2| Likewise, .the .upperend of theflshaft 2L hasv threads ZSI-by means of which the connector,-. or space. piece, 31 may. be secured thereto." The lower wall of. the connector has .a. bore 3$,.th e{ purpose of which will :be explained hereinafter, and a larger bore 35in itsupper wall. A thread-' ed=flange3l is bolted to the upper wall. of the. connector 3! and is adapted tov be threadedlysecured to the sleeve 39 formed on the driven gear ll of 1a...reduction gearing, generally indi cated at 43. The reduction gearing 43 forms a part of. thedriving' mechanism and located within the. base-4 5 on which rests the driving motor..

The entire driving mechanism consisting of the motor Qt, the base land the gearing 43: is-enclosed. thescasing 49. .This' casing isfadapted to be. raised .or loweredin the hole being drilled by the stefnj5l, detachably secured by the studs. 53 to the'wall 55 whichr'forms a .part'of thecasing 49; The lower wallf5'l1of the "casing ll has a sleeve 59throughwhich passes thegear sleeve 39 and. betweenwhich is placed thebushing 6!. Abe'arin'g 63 reist's'onthe upper surface of the sleeve 59 .and "supportsi the jdriv'en' gear M. ,It

willbe noted" that the passage 65, through'the 1 The partition wall 69 has a central opening in which is placed the bushing I1, serving to guide the motor shaft 6'! and, likewise, the wall H has the bushing I9. Between the walls 69 and II the driver gear 81 is keyed to the motor shaft 61 and drives the follower gears 83 and 85 which are fastened respectively to the gear shafts 13 and 15. Below wall H and within the internal driven gear M and arranged so as to intermesh therewith are the follower gears 81 and 89; the follower gear 81 being securely fastened to the shaft 13, and gear 89'to the shaft 15.

With this. arrangement it is apparent that, when the motor 41 rotates the shaft 61, the driver gear 8| will also rotate and, since it is in mesh,

tubular and, consequently, has a passage 9| extending through its entire length. Through this passage and spaced therefrom, is the shot feeding conduit, or tube, 93. This conduit is formed with an enlarged portion 95 designed to extend through an opening 91 centrally located in the upper wall 99 of the casing 49. In order that the conduit 93 may revolve with respect to the casing 49, which is held against rotation, the portion 95 is journalled in the bearing IOI, resting on the upper wall 99 of the casing.

The portion 95 of the conduit 93 is arranged to receive the pipe I03 which forms a part of the shot supply means. A bushin I02, surrounding pipe I03 holds the packing I04 against the portion 95 of the conduit 93. The pipe I03 is connected by elbow I05 and pipe [01 to a valve I09 through which shot may be introduced into the pipe. Adjacent the valve I09 and interposed in the pipe I01 is a valve III through which water may be introduced if it is desired. The lower end of the conduit 93 extends into the shaft 2| and passes through the bore 33. A stufling box, consisting of the bushing H3 and packing II5, rests in the recess II'I formed in the connector just above the bore 33. This stuffing box prevents any passage of material between bore 33 and the conduit 93. When the motor 41 is driving the tool 3, as previously explained, the speed of the motor will naturally be much greater than the speed of the drill and, by spacing the conduit 93 from the shaft 61, the conduit 93 may remain substantially stationary. Of course, if desired, the conduit 93 and pipe I03 may be one continuous pipe and then there would be no necessity for bearing 95, since conduit 93 would then always be stationary. If, however, conduit 93 should be rotated, due to the friction between the conduit 93 and the stufiing box, the speed of rotation of the two would only be equal to the speed of rotation of the drill which would not, in any way, hinder the passage of shot through the conduit 93.

When it is desired to employ the shot, it may be introduced through the valve I09 with or without water supplied through valve III. The

shot introduced through the pipe I01 will fall by gravity through pipe I 03 into the conduit 93 and, after leaving conduit 93, will pass through the shaft 2| and the port I9 to strike the baiile plate I5. The baffle plate I5 serves to deflect the shot from the core 9 and let it drop to the cutting tool formed on the drill 3 in order that the cutting teeth may be kept clean. In order to remove the cuttings it will be necessary to introduce water with the shot so that the cuttings may be carried upwardly from the cutting teeth by the water through the space between the wall II and the cutting tool 3 and be deposited on the transverse plate I3.

This construction, therefore, lends itself to a simple but efficient method of introducing shot to the cutter tool of a rotary drill and, although a preferred embodiment of the invention has been illustrated and described, it is not to be limited save as defined in the appended claims.

I claim:

1. In a rotary drilling apparatus, a casing, a. driving motor in the casing having a shaft, a series of reduction gears in the casing adapted to be driven by the motor, a sleeve on one of the reduction gears, a connector secured to the sleeve, a cutter element secured on the connector, a stuffing box in the connector, a tube extending, through the motor and reduction gears and stufling box terminating adjacent the cutter to supply shot thereto.

2. In a rotary drilling apparatus, a casing, a driving motor in the casing, a series of reduction gears in the casing, a shaft to enable the motor to drive the gears, a sleeve on one of said gears extending through the casing, a bearing on the casing for the sleeve, a connector secured to the sleeve, a stufling box in the connector, a hollow shaft secured on the connector, a rotary cutting tool on the shaft, a conduit extending through the motor shaft and terminating in the hollow shaft, and a pipe through the casing opening into the conduit to supply shot through the conduit to FRANK MILLER.

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