US1690085A - Drilling tool - Google Patents

Description

Oct. 30, 1928.

M. P. HOLMES DRILLING TOOL 2 Sheets-Sheet 1 Filed' March 1'7, 1926 Am A-WMQ Oct. 30, 1928.

M. P. HOLMES DRILLING TOOL Filed March 17, 1926 2 Sheets-Sheet 2 pwA Wm Patented Get. 30, 1928.

UNITED STATES PATENT, oF ce,

11033151. HOLMES, or. otnnnmonmnnw nAMPsnInE, lemma TO sU LL IvAN MA :CHINEBY oourrnmr, A;oonromirror: or MASSACHUSETTS.

DRILLING TOOL.

Application filed March 17,1926L Seria1 No. 95,400. I

Ihis inventionrelates to drilling toolsand more particularly to hand held drilling tools of therotary type especially adapted to use with coal mining machines iii-drilling shot? holes in theicoal during or subsequent to the cuttingof a kerili therein and preparatory to the shooting of the coal'fron'i the solidl.

In coal miningduring or subsequent to the cutting of a lierf in' the 'face of the coal hy the coal cutting machine andipreparatory to i the shooting of the'coal from the solid,

it is the" usual practice to drill a series of shot 110183111 the coal. Explosivesare then ginserted in the shot? holes andthe coal shot source oipower and which is of exceed having improved and simplified e. "and driving means there't ihle transmi.

fromthe solid in the usual rnanncr. In certain instances, the drilling tools for drilling these shot holes are driven independently of the coal mining machine, thereby greatly increasing the installation cost by the necessity of laying out separate power lines to both the drilling tool a-nd the mining machine. These drilling tools are usually selfcontained mechanisms adapted to be held by the operator during an ope 'ation thereof and driven by separate-air or electric motors and are necessarily cumbersome and unwieldy to operate, due to the inherent-weight of such motors and their related parts. a A primary object of this invention is to provide a drillingtoel especially dapted to use indrillingshot holes in the coal and which is driven directly from the mining machine driving motor, thereby substantially decreasing the dimensions and v of thetool. Another. object of this inireely inov l bodily in any direction with respect t inexpensive, siii'iple, and compact rhai A still further ob ect or this invcn 1031 l provide an improved hand held l 11;; tool orf Y LO prov de '2: improved s between the tool. and

These and oil 1' objects ofmy inve on will, however, quently more fully appear.

the source of po the mining of the coal.

-rot ary drilling tool having a power shaft connected in a socket formed in one ofthe transmissiongears for the cutting mechanism of a'inining n'iaohine and this shaft-preterably drives the .tlrilling tool through suitable controlling "mechanism and a flexihle transmission shaft, herein preferably in the'fi'orm of a Wire rope or cable housed within a suitable flexible metallic covering. V

, In the accompanying drawings I have shown for purposes of illustration one form whichmy invention'niay assume in practice.

In these drawings, 4

F ig. 1 is'a side elevation of the on ting end of a mining machine with which my improved drilling tool associated.

F 2 is a diagrammatic View illustrating the operation of the improved 'drillingtool 111 a mine. :Fig. 3 is a central longitudinal sectional iew through the ii nproved drilling tool.

' Fig. 4 is a'central longitudinal sectional view through a portion of the improved transmission means for the drilling tool.

Fig, 5 is a vertical transverse sectional view taken substantially on line 5+5 of Fig. l illustratinga portion of the improved con trolling mechanism.

Fig. 6 is a detail view of the driving ratchet mechanism.

In this illustrative construction I have shown 'a drilling tool of improved form generally designated 1 operatively connected, through a flexible transmission element 2, to the cuttin endvof a mining machine generallyv designated 3. The mining machine Smay iiio chine the type descrihedin my copending application, Serial No. 6, 177, filed Feb. 2, 1925. ills the structure of this mining ma chine does not speeihoallyenter into my 1nvention, detailed illustration and description of the same 1s deemed'unnecessary otherthan .L' 1. J.

to state that an armature shaft 4 of a reversihlemotor, not shown, is provided and drives through transmission means, to he herein alter describedfa usual driving sprocket 5 which cooperates with the usual cutter bit carrying cutter chain 6 to drive the latter in a well known manner. As illustrated, the motor shaft l is adapted to have connected thereto by means of a manually operable gear clutch T a bevel pinion 8 which is meshed with a larger bevel gear 9 rotatable on an axis perpendicular to the axis of the motor shaft 1 and this gear 9 is journaled within suitably spaced alincd hall bearings 10 carried within the machine frame. The bevel gear 9 has formed thereon a spur pinion 11 which meshes with a larger spur gear 12 journaled on bearings 1?: suitably carried in the machine frame. As shown the gear 12 is adapted to drive through a manually controlled gear clutch 14:, as is clearly described in my copending application mentioned above, a cutter chain driving shaft 15. the latter being iournaled at its opposite ends within alined ball bearings 16. The shaft has keyed thereto at its lower end at 17 the cutter chain driving sprocket From the foregoing descripti on it will be clearly evident that when the clutches 7 and 1% are connected, the cutter chain driving sprocket 5 is adapted to be driven from the mining machine motor, butthis driving sprocket 5 may be disconnected from the transmission gearing 8, 9. 11, and 12 at will by means of the gear clutch 14;.

In referring more particularly to the improved construction, that is to the drilling tool and the driving and controlling connections therefor, it will be observed that disposed within a vertical socket or bore 18 formed within the shaft supporting the gears 9 and 11 and secured thereto by a key 19 is a shaft 20. As shown. the upper end of the shaft 20 is provided with a flat disk-shaped portion or flange 21 having formed on the upper plane surface thereof. projecting ratchet teeth 22 which are adapted to cooperate with correspondingprojectingratchet teeth 23 formed on a circular flange 24' carried at the lower end of a shaft 25, the latter being splined. as at 26, in operative sliding relation to a spiral gear 27. arranged coaxially with the spur pinion 11 and having oppositely projecting hub portions '28 journaled respectively in ball bearings .29 carried within a casing or housing member 30. suitably secured by bolts 31 to the frame of the mining machine. The casing is, in this instance, composed of two main parts held together by bolts 32 and is provided with a depending sleeve portion which forms a support for the upper ball bearing 10 in which the gears 9 and 11 are journaled. In accordance with this invention. a coiled spring PA encircles the shaft and is interposed between the flange 2t and the lower hub portion of the spiral gear 27. and this spring normally tends to yieldably hold the ratchet teeth 2'2 23 in interengagcd relation. To release the engagement of the ratchet teeth 3 an operating lever 35 is provided, secured as by a transverse pin 36 to an actuating rod 37 slidably mounted in a bore 38 formed in a detachable cover plate 53!) secured to the casing 30. Furthermore, the handle 35 has formed thereon a cam 40 which engages a cam surface 41 formed on the upper surface of the cover plate 39. As shown the lower end of the rod 37 is provided with a circular flange 42 which engages an inwardly extending llange til formed on a member a l threadcdl y connected, as at 4:5, to the upper end of the shaft 25. From the foregoing description, it will be obvious that when the operator rotates the handle 35 the cam 4.0 rides upwardly on the cam surface 11, thereby causing longitudinal upward moven'ient of the rod 57 and the shaft 2.. consequently releasing the interengagement of the ratchet teeth 22, 23. It is therefore evident that the gear 27 may be driven or remain idle at will during running of the transmission gears 9, 11, and 12 oil the mining machine cutting mechanism. Meshing with the spiral gear 27 and disposed on an axis at right angles to the axis of the gear 27 is a spiral gear 46 having secured thereto, as by bolts 4-7, op ')ositel v extending hub portions 48 and 4-9 journaled respectively in ball bearings 50 suitably carried within bores 51 formed within the opposite, ends of the casing 30, closure members and 53 closing these bores. Secured within the spiral gear 46 is a series of clutch disks 54; which are interleaved with a series of clutch disks carried by a clutch member 56 journalcd at its opposite ends in radial bearings 57 and thrust bearings 58 carried by the hub portions 48 and 49. Slidably mounted on the hub portion 4-9 is a clutch applying member 5.) having projecting fingers (30 extending through apertures 61 formed in the member 49 and these lingers (it) engage certain of the series of clutch disks 54, 55. Encircling the hub portion -19 and engaging the actuating member 59 and an adjustable collar (32 is a coiled spring 63. This spring tends to constantly force the clutch disks in. together. F or releasing the actuating n'iember 59 is a ship per yoke G l. engaging a radial flange (34 formed on the actuating member. The shipper yoke 64; is pivoted, as at (if). and is secured to a transversely disposed shaft (35 suitably journaled in the casing 30. The outer end of the shaft (35 has securml thereto an operating lever 66. It will therefore be evident. that when the lever (36 i swung downwardly the shipper yoke (J lswings about its pivot and the clutch actuating member is slid longitudinally, thereby releasing the engagement of the clutch disks and compressing the coiled spring (13. It will also be obvious that by slipping the clutch disks 54, the speed of rotation of the drilling tool maybe varied and that when the cutting tool is overloaded the clutch disks 54, may automatically slip,

thereby preventingrbreakage of the parts. Splined asat 67 in operative sliding relation with the clutch member 56 is a rotatable transmission member or shaft 68 having formed thereon at its forward end an enlarged socket portion 69 within which the rear end of a flexible transmission element 70, herein preferably in the form of a spirally laid wire rope orcablej, is suitably rigidly secured preferably by brazing. The element 70 is so arranged that application of the relative force to its rear end tends to wind it tighter rather than to unwind it during drilling. The forward end of the wire rope 70 is likewise rigidly secured within a socket 71 formed withina member 72 secured as by atransverse pin 7 3 to a member 74, the latter being threadedly connected, as at 75, to a tool driving shaft 7 6. The tooldriving shaft 7 6 is journaled at its opposite ends in ball bearings 77 of the combined radial and thrust type suitably carried within a casing 78 of the drilling tool 1. In this instance the forward endof the shaft 7 6 has formed integral there with a socket 78 which is adapted to receive the shank of the usual auger cutting tool 79. It will herein be observed that-siutably secured. at one end within a bell-mouthed guide member or adapter 80, threadedly connected as at 81 to the cover member 52, isa tubular metallic armor or covering element 82 for the cable 7 0, herein preferably of flexibly 'ointed structure. The opposite end'of the exible covering member 82 is suitably secured within a bell-mouthed guiding member or adapter 83, the latter being threadedly connected as at 84 to the casing 78 of the drilling tool. As illustrated, the casing 78 of the drilling tool is provided, with lateral lugs or ears 85 to which are ivotallyconnected as at 86 oppositely extending lateral handles 87, the latter having lugs or stop members 88 wh ch are adapted to engage the sides of the'casing 78 when the handles are in extended position. The handles may be folded inwardly against the sides of the casing .78, as indicated by dotted lines in 3, when the tool is not in In theuse of my improved drilling tool, it will herein be noted that after the kerf has been cut in the coal by the mining machine,

. the clutch 14 is thrown out by the operator,

disconnecting the cutter chain drive and the, machine is then retracted from the face in a Suitable manner to the" position shown in Fig. 2. The operator then manipulates the handle 35, thereby causing the ratchet teeth 22, 23 to be forced into operative driving engagement by means ofa coiled spring 34, thus causing the spiral gears 2fZand 46 and consequently the flexible transmission element 70 to be rotated, the splined connection 67 permitting slidingmovement between the transmis sion element 70 and, the clutch member 56as the wire ropel70 alternately shortens and,

lengthens under load. This alternateshortening and lengthening of the Wire rope transmits a vibrating action to the auger cutting bit which is found to be advantageous under certain conditions. It will also be noted that during. this operation the frictional engagement between the clutch disks 54, 55 may be interrupted or varied at will upon suitable manipulation of the lever 66. The operator 7 then grasps the handles 87 and the auger cutting tool is suitably positioned'with re-.

herein also be noted that the ratchet teeth 22, 23 automatically prevent reverse drive of the spiral gears 27 and 46 upon reversal of'the drivlngmotor, consequently preventing the uncoill ng and the resultant damaging of the wire rope 70 and its related. parts. It will also be ,noted that if desired, the shot holes operation of the miningmachine thereby de- CIGEISIIIO the time consumed n breaking down theco. These and other operations of the may bedrilled in the coalduring the cutting improved mechanism will be clearly apparent to those skilled in the art. 7

As a result of this invention it will-benoted that an improved drilling tool is provided which is dirven from the transmission means of the cutting mechanism of, the mining machine, thereby reducing the dimensions and weight ofthe drilling toolto a minimum. It

. will further be noted that an improved rotary drilling tool is provided which is of ex? ceedingly simple, inexpensive, -and compact character. These and other advantagesof y invention will be clearlyapparent tothose skilled in the art. r

While I have in this application specifically described one form which my 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 embodiedin 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: v r

1. In a drilling tool, a power driving element adapted to be driven in opposite directions, cooperating gearing driven thereby, mechanism connecting said gearing with said driving element, said mechanism being automatically operative to prevent driving of said gearing when said driving element is driven in one direction, a transmission shaft, a clutch connecting said shaft withsaid gearing, a flexible transmission shaft driven by llu said shaft, and a drilling tool driven by said flexible transmission shaft.

2. In a drilling tool, a power driving element, cooperating gearing driven thereby, a ratchet mechanism connecting said gearing with said driving element, a transmission shaft, a clutch connecting said gearing with said shaft, a flexible transmission shaft driven by said shaft, and a drilling tool driven by said flexible transmission shaft.

3. In a drilling tool, a power driving element, cooperating gearing driven thereby, a ratchet mechanism for connecting said gearing with said driving element, means for rendering said ratchet mechanism inoperative, a transn'iission shaft, a clutch conneetii'ig said gearing with said transmission shaft, a flexible transmission shaft driven by said shaft, and a drilling tool driven by said flexible transmission shaft.

4. In a drilling tool, a power driving element, cooperating gearing driven thereby, a ratchet mechanism for connecting said gearing with said driving element, manually operable cam means for rendering said ratchet mechanism inoperative, a transmission shaft. a clutch connecting said gearing with said transn'iission shaft, a flexible transmission element driven by said shaft, and a drilling tool driven by said transmission element.

5. In a drilling tool, a power driving element, cooperating gearing driven thereby, a clutch connecting said gearing with said driving element, a transmission shaft eonnectible in operative sliding relation with one of said gears, a clutch connecting said gearing with said shaft, a flexible transmission element driven by said shaft, and a drilling tool driven by said transmission element.

6. In a drilling tool, a power driving element rotatable in opposite directions, coopcrating gearing driven thereby, a ratchet mechanism releasable at will during driving thereof connecting said gearing with said driving element, said ratchet mechanism being adapted to slip when said driving element is rotated in one direction, a transmission shaft, a clutch connecting said gearing with said shaft, a flexible transmission elelnent driven by said shaft and adapted to rotate in only one direction, and a drilling tool driven by said transmission element.

7. In a drilling tool, a power driving elcment rotatable in opposite directions, eoopcrating gearing driven thereby, a ratchet mechanism releasable at will during driving thereof for connecting said gearing with raid driving element, said ratchet mechanism being adapted to slip when said driving element is rotated in one direction, a transmission shaft, a clutch connecting said gearing with said shaft, a transmission element driven by said shaft and adapted to rotate in only one direction, and a drilling tool driven by said transmission element.

8. In a drilling tool, a power driving element rotatable in opposite directions, cooperating gearing driven thereby, a atchet mechanism for connecting said gearing with said driving element, said ratchet mechanism being adapted to slip when said driving element is rotated in one direction, means operable at will during driving of said ratchet mechanism for rendering said ratchet mechanism inoperative, a transmission shaft, a clutch conncctil'lg said gearin; with said shaft, a transmission elcment driven by said shaftand adapted to rotate in only one di rection, and a drilling tool driven by said transmission element.

9. In a drilling tool, a power driving element rotatable in opposite directions, cooperating gearing driven thereby, a ratchet mechanism for coi'inecting said gearing with said driving element, said ratchet mchanism being adapted to slip when said driving element is rotated in one direction, means operable at will during driving of said ratchet mechanism for rtaidering said ratchet 1nechanism inoperative, a transmi simi shaft, a clutch connecting said gearing with said shaft, a flexible transmission element driven by said shaft and adapted to rotate in only one direction, and a drilling tool driven by said transmission element.

10. In a drilling tool, a power driving element rotatable in opposite directions, cooperating gearing driven thereby, a ratchet mechanism for connecting said gearing with said driving element, said ratchet mechanism being adapted to slip when said driving element is rotated in one direction, manually operable cam means for rendering said ratchet mechanism inoperative, a transmission shaft a clutch connecting said gearing with said shaft, :1 transmissionclement driven by said shaft, and a drilling tool driven by said transmission element.

11. In a drilling tool, a power driving element rotatable in opposite directions, eooperating gearing driven thereby, a ratchet mechanism for connecting said gearing with said driving element, said ratchet mechanism being adapted to slip when said driving element driven in one direction, resilient means for maintaining said ratchet mechanism in operative position, manually controllable means operable at will during driving of said ratchet mechanisn'i for (wercoming said resilient means to render said ratchet mechanism inoperative, a transmission shaft, a, clutch connecting said gearing with said shaft, a transmission clement driven by said shaft and adapted to rotate in only one direction, and a drilling tool driven by said transmission element.

1.2. In a drilling tool, a driving element, spiral gearing driven thereby. a ratchet mechanism for connecting said driving element with one of the gears of said gearing, said mechanism comprising cooperating ratchet elements and a spring for forcing said elements together, manually operable cam means for separating said ratchet elements to render said ratchet mechanism inoperative,-a transmission shaft, a friction clutch for connecting said gearing tosaid shaft, a flexible transmis sion element driven by said shaft, and a drilling tool driven "said transmission element.

13. In a drilling tool, a power driven element rotatable in opposite directions, spiral gearing driven thereby, a ratchet mechanism for connecting said driving element with one of the gears of said gearing, said ratchet mechanism being adapted to slip when said driving element is rotated in one direction and comprising cooperating ratchet elements and a spring for forcing said elements together, manually operable cam means for separatmg said ratchet elements to render said ratchet mechanism inoperative, a transmission shaft,

a friction clutch for connecting said gearing to said shaft, a flexible transmission element driven by said shaft, and a drilling tool driven by said transmission element.

14. In a drilling tool, a power driving element, cooperating spiral gears driven there by, a ratchet mechanism for connecting one ofsaid gears with said driving element, said ratchet mechanism comprising cooperating ratchet elements, a spring for forcing said elements together, one of said elements having operative sliding relation with one of said gears, a transmission shaft, a clutch for connecting said gearing to said shaft, arflexible transmission element driven by said shaft, and a drilling tool driven by said transmission element. r

15. In a drilling tool, a power driving element, cooperating spiral gears driven thereby, a ratchet mechanism for connecting one of said gears with said driving element, said ratchet mechanism comprising cooperating ratchet elements, a spring for forcing said elements together, one of said elements having operative sliding relation with one of said gears, means for rendering said ratchet mechanism inoperative, a transmission shaft, a clutch for'connecting said gearing to said shaft, a flexibletransmission element driven by said shaft, and a drilling tool driven by said transmission element. a

16. In a drilling tool, a power driving element, cooperating spiral gears driven thereby, a ratchet mechanism for connecting one of said gears with said driving element, said ratchet mechanism comprising cooperating ratchet elements, a spring for forcing said elements together, one of said elements having operative sliding relation with one, of said gears, manually operable cam means for rendering said ratchet mechanism inoperative, a transmission shaft, .a clutch for connecting said gearing to said shaft, 'a flexible transmission element driven by said shaft, and a drilling tool driven by said transmission element.

17 In a drilling tool, a power driving elc ment rotatable in opposite directions, spiral gearing driven thereby, a ratchet mechanism for connecting one of the gears of said gearing with said driving element, said ratchet mechanism being adapted to slip when said driving element is rotated inone direction and comprising cooperating ratchet elements, a spring for forcingsaid ratchet elements together, one of said elements having operative sliding relation with one of said gears, a transmission shaft, a friction clutch for connecting said shaft with said gearing, a flexible transmission element driven by said shaft, and a drilling tool driven by said transmission element.

18. In a drilling tool, a power driving element rotatable in opposite directions, spiral gearing driven thereby, a ratchet mechanism for connecting one of the gears of said gearing with said driving element, said ratchet mechanism being adapted to slip when said driving element is rotated in one direction and comprising cooperating ratchet elements, a spring for forcing said ratchet elements together, one of said elements having operative sliding relation with one of said gears, means for rendering said ratchet mechanism inoperative including means for forcing said ratchet elements apart, a transmission shaft, a friction clutch for connecting saidshaft with said gearing, a flexible transmission element driven by said shaft, and a drilling tool driven by said transmission element.

19. In a drilling tool, a power driving ele ment, cooperating gearing driven thereby, mechanism connecting said gearing with said driving element, a reciprocable transmission shaft, a clutch connecting said gearing with said shaft, a flexible transmission shaft fixed to and driven by said shaft, and a drilling tool driven by said flexible transmission shaft. In testimony whereof I afiix my signature.

MORRIS P. HOLMES.

Images