US1667156A - Drilling tool - Google Patents

Description

April 24, 1928.

M. P. HOLMES DRILLING TOOL Filed Oct. 1925 3 Sheets-Sheet 1 jkoeufar: filo/n25 I. 170/0160".

Qy/fq April 24. 1928.

M. P. HOLMES DRILLING TOOL 3 Sheets-Sheet 2 Filed Oct. 1925 Q 6 a QNN g w w: g 4 a 61 w $6 a & Q Q Q m ii 6 www w .mfiw a? MM Q QR N Patented Apr. 24, 1928.

UNITED STATES PATENT OFFICE.

MORRIS P. HOLMES, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

DRILLING TOOL.

Application filed October 2, 1925.

This invention relates to hand held drillin tools and more particularly to hand he (1 drilling tools of the rotary type especially adapted to use with coal mining machines in drilling shot holes in the coal after the kerf has been cut therein preparatory to the shooting of the coal from the solid.

In coal mining it is desirable to drill a series of shot holes in the coal subsequent to the cutting of a kerf in the face of the coal by the coal cutting machine and preparator to the shooting of the coal from the so id. Usually the drilling tools for drilling these shot holes are driven independently of the mining machine thereby greatly increasing the initial cost by the necessity of laying out separate power connections to both the drill and the mining machine. Usually such drilling tools are self-contained units held b the operator during operation thereof an 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 primary object of this invention is to provide a drilling tool especially adapted to use in drilling shot holes in the coal and which is driven directly from the mining machine driving motor thereby substantially decreasing the cost, weight, and size of the tool while still perniitting'a tool having the necessary power to be obtained. Another object of this invention is to provide an improved rotary drilling tool freely movable bodily in any direction with respect to its source of ower and especially adapted to use in dril ing shot holes in the coal and which-is of an exceedingly inex ensive, simple, and compact character; till another object of this invention is to provide an improved hand held drilling tool having improved and simplified controlling and drivin means therefor. Yet another object of this invention is to provide an improved drilling tool having improved flexible transmission means between the same and the source of power. These and other obi'ects will, however, subsequently more in 1y appear.

This invention in one of its aspects may comprise a drilling tool deriving its power Serial 'No. 60,076.

through the transmission gearing for the cutting mechanism of a coal mining machine with which the drilling tool cooperates in winning the coal from its natural bed. More specifically this invention may comprise a rotary drilling tool having a power shaft connected in a socket formed in one of the transmission gears for the cutting mechanism of a mining machine and this, shaft preferably drives, through bevel gears and a manual y operable jaw clutch and ratchet device carried within a swivel connection on the mining machine, a. flexible transmisslon shaft herein referably in the form of a wire rope or ca le housed within a suitable metallic armor or covering. This shaft preferabl drives the-cutting tool through frictional y controlled spur gears rotatable on parallel axes and housed within the casing of the tool. Lateral] projecting handles are preferably provided on the easing of the drilling tool to enable the operator to handle the same with facility.

In the accompanyin drawings I have shown for purposes illustration three forms which my invention may assume in practice.

In these drawings,

Fig. '1 is a fragmentary side elevation of a coal cutting machine with which my improved drilling tool is associated.

Fig. 2 is a diagrammatic viewillustratin the operation of the improved drilling too in a mine.

Fig. 3 is a central longitudinal sectional view through the improved drilling tool and a portion of the improved transmission means therefor.

Fig. 4: is a rear end elevational view of the improved drilling tool taken substantiall on line 4-4 of Fig. 3, the transmission sha t being shown in section.

Fig. 5 is a detail view of the driving ratchet.

Fig. 6 isa view similar to that shown in Fig. 3 illustrating a somewhat modified form of drilling tool.

Fig. 7 is a transverse vertical section taken, substantially on line 7- 7 of Fig. 6.

Fig. 8 is a central longitudinal sectional vieiv of a further modified form of drilling too In the illustrative construction shown in I igs. l to I have shown a drilling tool of improved form generally designated 1 operatively connected through a flexible transmission element 2 to a mining machine generally designated 3. The mining machine 3 may assume various forms, but for the purposes of illustration I have shown a minmg machine of the type described in my copendmg application Serial No. 6,477, filed ch. 2, 1925. As the structure of this machine does not specifically enter into my invcntion detailed description of the same is deemed unnecessary other than to state that a shaft 4 of a reversible motor. not shown, is provided which drives through trans mission means to be hereinafter described a 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 4 is adapted to have connected thereto by means of a manually operable gear clutch 7 a bevel pinion 8 which is meshed with and drives a larger bevel gear 9 rotatable on an axis perpendicular to the axis of the motor shaft and the gear 9 is 'ournaled within suitably s aced ball earings 10 carried within t e machine frame. The bevel gear 9 has formed thereon a spur pinion '11 which meshes with and drives a large spur gear 12 journaled on bearings 13 carried by the machine frame. adapted to drive through a manually operable gear clutch 14, as is clearly described in my copending application mentioned above, a cutter chain driving shaft 15, the latter being journaled at its opposite ends within ball bearings 16 carried by the machine frame. This shaft has keyed thereto, as at 17 the cutter chain driving sproket 5. From the foregoing description it will be clearly evident that when the clutches 7 and 14 are connected the cutter chain driving sprocket 5 is adapted to be driven from the mining machine driving motor and that this driving sprocket may be disconnected from the transmission gearing 8, 9. 11, and 12 at will by means of the clutch 14.

Referrin more particularly to my improved dril in tool and driving connections therefor, it wi 1 be observed that secured by a key 18 within a verticaLsocket or bore 19 formed within the shaft supporting the gears 9 and 11 is a driving element 20 having a bore 21 extending through a substantial portion of its length. As shown, the upper end of the element 20 is provided with diametrically opposite vertical slots 22 which are adapted to receive the ends of a transversely disposed pin 23 suitably secured withm a transmission shaft 24 having at its lower end a central opening or recess 25. Disposed within the bore 21 in the element 20 and the opening 25 in the shaft 24 As shown, the gear 12 is is a coiled compression spring 26 which normally tends to force the members 20 and 24 apart. The upper end of the shaft 24 is provided with a lateral circular flange 24 having formed on the upper surface thereof ratchet teeth 27 which are adapted to cooperate with corresponding ratchet teeth 23 formed on an annular depending flange 29 carried at the lower end of a bevel gear 30. As shown, the bevel gear 30 is provided with an upstanding sleeve portion 31 suitably journaled in a bearing sleeve 32 carried withm a bore 33 formed in a casing or housing member 34. In this instance the bevel gear 30 is held against inward axial movement by means of a radially expanding split ring 35 which engages an annular bearing member 36 supported by the upper flange 37 of the bearing sleeve 32 and disposed in a bore 38 formed in the upper end of the casing member 34. As shown, the bore 38 is closed by a suitable head or cap member 39 held in position with respect to the casing 34 by means of cap screws 40. Herein it will be observed that the casing member 34 is rotatably mounted or swiveled within a bore 41 formed within a detachable supporting member 42 secured as 1) screws 43 to the frame of the mining mac line, the member 42 also having a depending sleeve portion 44 which forms a support for the upper bearing 10. The inner periphery of the member 42 is circumferentially grooved or recessed at at 45 and with this groove radially located pins 46 carried by the casing member 34 cooperate to prevent axial displacement of the latter member from the bore 41 While still hermitting free rotatable movement. thereof. In accordance with this invention a manuallv adjustable element 47 is provided which threadedly engages a thread opening 47 formed in the closure member 39 and this member 47 projects inwardly within the hollow sleeve portion 31 of the gear 30 and into engagement with a ball thrust hearing 48. The ball bearing 48 is disposed bctwcen the member 47 and a member 49 slidably mounted in the bore of the sleeve 31 and having at its lower end a suitable recess 50 within which a suitable ball thrust bearing 51 is disposed. the latter engaging th upper surface of the lateral flan e 24 formed on the shaft 24. It will has be evident that when the member 47 is suitably adjusted the member 49 is thrust axially, com ressing the spring 26 and forcing the rate et teeth 27, 28 formed on the members 24 and 30, respectively, apart, consequently disconnecting the drive therebetween, the pin 23 sliding in the vertical slots 22 in the member 20 at that time. Meshed with the bevel gear 30 is a similar bevel gear 52 threadedl secured as at 53 to a member 54. the latter being journaled in a bearing sleeve 55 disposed within a bore 56 disposed at.

a recess 59 formed within one end of a 1'0 tatable transmission member 60, splined, as at 61, in operative sliding relation with a spur pinion 62, the latter having laterally eiiztendin huh portions suitably journaled in spkaced bearing sleeves 63 suitably carried by t e casing'or housing 64 of my improved drilling too. It will herein be observed that disposed between the casing 34 and casing 64 and through which the wire rope 58 extends is a tubular metallic armor or covering element 65 preferably of flexible 'ointed structure. The ends of the memer 65 project within split clamping ele ments 66 having external tapered surfaces 67 which cooperate with corresponding internal tapered surfaces formed in rotatable clamping members 68 threadedly connected at 69 to the casin s 34 and 64, respectively. In accordance wit this invention the casing 64 is preferably composed of two main parts 70 and 71 held to 'ether by means of cap screws 72, the mem er 70 bein detachable to permit the assembling or disassembling of the drill arts with facility. As shown, the spur pinion 62 is meshed with a larger spur gear 73 having a hub portion 74 journaled on an axis parallel with the axisof the pinion 62 in a bearing sleeve 75, keyed as 'at 76 to the detachable casing member 70.

Carried by the spur gear 73 is a series of clutch plates 77 which are interleaved with a series of clutch plates 78 carried by a clutch member 79 keyed as at 80 to a shaft 81 disposed coaxially with the gear 73. The shaft 81 is Tournaled in a bearing sleeve 82 carried by t e casing member 70 and a bearrear end of the shaft 81 has threadedly connected thereto, as at 85, an adjustable member 86 which is adapted to adjust the tension of a coiled spring 87 encircling the shaft 81 and engaging the rear surface of a clutch applying member 88 slidably mounted on the shaft. The forward cylindrical plane surface of the clutch member 88 is provided with projections 89 which extend into enga ent with certain of the series of clutch is s 77, 78. It will herein be noted that the clutch member 88 is provided at its rear end with an outwardly projecting cylindrical flange 90 with which :1 yo te member 91 cooperates, the latter being carried by an actuating shaft 92 disposed parallel with the shaft 81 and slidably mounted in bores formed in the casing member 71 and the cover plate-84. The clutch actuating shaft 92 at its rear end is threadedly engaged by a manually operable adjusting member 93. In this instancethe forward end of the shaft 8-1 extends outwardly through a. bore formed in the front closure plate 94 suitably secured to the casing member 70 and this shaft 81 has formed therein at its outer end a tapered socket 95 which is adapted to receive the shank of a usual auger cuttin tool 96. Engaging a circular bearing pits 97 carried within the cover member 84 is a ball thrust bearing 98 disposed within a recess 99 formed in the reduced portion 100 of the shaft 81. F urthermorc, secured within opposite sides of the casing 64 are laterally projecting handleslOl which are adapted to be grasped by the operator'during the various operations of the drilling tool.

In the use of the form of my invention shown in Figs. 1 to 5 it will herein be noted that after the kerf has been cut in the coal by the mining machine the cutter chain 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 ad ustable member 47, permitting the ratchet teeth 27, 28 to be forced into operative driving engagement by means of the coiled spring 26, thus causing the bevel gears 30 and 52 and consequently the flexible transmission element 58 and pinion 62 to be rotated, the splined connection 61 permitting sliding movement between the transmission member and the pinion 62 as the wire rope 58 alternately shortens and lengthens under load. This alternate shortening and lengthening of the wire rope transmits a vibrating action to the auger cutting'bit which is advantageous under certain conditions. It will also be noted that during this operation the spur gear 73 freely rotates in its bearing sleeve 75. The 0 erator 'then manipulates the adjusting mein er 93, thereby permitting the coiled spring 87 to force the interleaved clutch disks 77. 78 into driving engagement, thus causing the shaft 81 to be rotated. The operator then grasps the handles 101 and the auger cutting tool is suitably positioned with respect to the coal face and is fed inward] as the hole deepens, the thrust of the cutting tool being taken on the thust bearing 98 at that time. After a series of shot holes has been drilled in the coal, the operator throws out the enga ement of the friction clutch disks 77, 78 iy compressing the spring 87. Due to the flexible wire rope 58 and the swivel connection of the casing 34 the drilling tool 1 may be located in any desired position with respect to the mining machine. It will herein be noted that the ratchet teeth 27, 28 automatically prevent reverse drive of the bevel gears 30 and 52 upon reversal of the driving motor, consequently preventing the uncoiling and resultant damaging of the wire rope 58 and its related parts.

In the form of my invention shown in Figs. 6 and 7 it will be observed that the transmission connections for the rear end of the flexible transmission element 58 are substantially identical to those described above while the forward end of the element 58 is suitably rigidly secured, preferably b brazing, within a recess formed within t e rear end of a transmission member 103 splined as at 104 in operative sliding relation with a spur pinion 105. Herein the pinion 105 is provided with a rearwardly projecting sleeve portion 106 journaled within a concentric sleeve portion 107 formed on a spider member 108 which has suitably secured thereto stub shafts 109 which form supports for a plurality of planetary gears 110 meshing with the spur pinion 105 and with a large internal gear 111. As shown, the gear 111 is provided with a forwardly projecting hub portion 112 disposed coaxially with the pinion 105 and journaled within bearing sleeves 113, 113 carried by the drill casing 114. Furthermore, it will be observed that the hub rtion 112 is provided at its front end witi a tapered socket 115 within which the shank of an anger drilling tool 116 is adapted to be secured. In accordance with this invention the spider memher 108 is provided with an outwardly ex- .tending circular flange 117, the opposite sides of which are engaged by friction rings 118. Threadedly connected to the casing 114 are bolts 119 encircled by coiled springs 120 disposed in recesses 120 formed within a pressure applying member 121, the latter having a rearwardly located reduced threaded portion 122 with which a manually operable adjustable member 123 is secured. As shown the member 121 is adapted to engage pins 124 which extend through suitable apertures in the casing 114 and nto engagement with the rear friction ring 118. As shown, secured to the opposite si es of the casing 114 are laterally pro ecting grasping handles 101.

In the use of this form of my Invention it will be assumed that the ratchet teeth 27, 28 are connected and the flexible transmission element 58 is rotating. The operator then manipulates the adjustingmember 123, releasing the tension on the springs 120, causing the latter to force the member 121 and the pins 124 into engagement with the friction rings, consequently preventing the spider member 108 from rotating relative to the casing 114. When this spider member 108 is held stationary power is transmitted from the transmission element 103, spur pinion 105, planetary gears 110, internal gear 111, to the cutting bit 116. If it is desired to stop operation of the cutting tool the operator manipulates the member 123 in a reverse manner and the springs 120 are compressed, releasing the spider member 108 and permitting the latter to freely rotate, thus causing the bit to remain stationary.

In the form of my invention shown in Fig. 8 it will be observed that the flexible transmission element 58 is coiled in a reverse manner from that shown in Figs. 3 and 6 while planetary pinions 125 are journaled on bearing sleeves 126 carried by stub shafts 127 disposed parallel with the axis of the pinion 5 and these shafts are carried by a spider member 128. The member 128 has a forwardly projecting cylindrical hub portion 129 suitably journaled in spaced bearing sleeves 130 and 130 carried by the casing 114 of the drilling tool. The forward extension of the spider member 128 is provided with a ta ered socket 115 which receives the shank 0 an auger cutting tool 116. In this instance the internal gear 111 is provided with an outwardly extending circular flange 131 with which the frictlon rings 118 are adapted to cooperate. Otherwise this form of my invention is substantially the same as described in Figs. 6 and 7.

In the use of this form of my invention it will be observed that when the member 123 is manipulated, the friction rings 118* are pressed together thus preventing rotation ofthe'internal gear 111 and causing the planetary gears to react thereon and to rotate relative thereto in an orbit about the axis of the pinion 105, consequently causing the spider member 128 and the cutting tool 116 to be rotated. With the exception that the flexible power transmission element 58*.

rotates in a direction opposite from that shown in Fig. 6 the operation of this form of my invention is substantially the same as that described above in connection with gther operations and advantages of my improved rotary drilling tool will be clearly apparent to those skilled in the art.

While I have in this application specifically described three forms which my invention may assume in practice, it will be understood that these forms of the same are 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 drilling tool, a power driving element, cooperating gearing driven thereby, a flexible transmission shaft driven by said gearing, a swivel mounting for said flexible shaft coaxial with one of said gears, and a drilling tool driven by said flexible shaft.

2. In a drilling tool, a power driving ele ment, cooperating gearing driven thereby, a flexible transmission shaft driven by said caring, a transmission shaft driven by said flexible shaft, cooperating gearing driven by said second mentioned transmission shaft, a tool drivin shaft, and a manually controllable clutc 1 for connecting said tool driving shaft to said last mentioned gearing.

3. In a drilling tool, a power drivin element, cooperating gearing driven there y, a flexible transmission shaft driven by said gearing, a transmission shaft driven by said flexible shaft, cooperating gearing driven by said second mentioned transmission shaft, said latter shaft having a reciprocatory movement relative to one of said gears, and a drilling tool driven by said last mentioned gearing.

4. In a drilling tool, a power drivin element, cooperating caring driven there y, a manually controlla le clutch for connecting said caring and said driving element, a flexib e wire rope transmission shaft driven by said gearing, a transmission shaft driven by said flexible shaft, a tool driving shaft, and cooperating earing for connecting said second mentioned transmission shaft to said tool driving shaft.

5. In a drilling tool a power drivin element, cooperating bevel Igearin driven t ereby, a manually control able c utch connecting said driving element to said caring, a exible transmission shaft driven y said gearing, a transmission shaft driven by said flexible shaft, a tool driving shaft, and cooperating gearing connecting said two last mentioned shafts.

6. In a drilling tool, a power driving element, cooperating gearing driven thereby, a transmission shaft driven by said gearing, a flexible transmission shaft driven bysaid shaft, :1. transmission shaft driven by said flexible shaft, one of said shafts having a reciprocatory movement relative to another of said transmission shafts during rotation thereof, cooperating gearing driven by said third mentioned transmission shaft, and a drilling tool driven by said last mentioned gearing.

7. In a drillin tool, a powerdriving element adapted to e driven in opposite directions, cooperatin gearing driven thereby, manually releasa le mechanism connecting said gearing with said driving element, said mechanism being automatically operative to prevent driving of said gearing when said drivin element is driven in one direction, a flexi le transmission shaft driven by said gearing and ada ted to rotate in only one direction, and a rilling tool driven by said flexible shaft.

8. In a drilling tool, a power drivin element adapted to be driven in opposite directions, cooperatin gearing driven thereby, manually releasa le mechanism connecting said gearing with said driving element, said mechanism being automatically operative to prevent driving of said caring when said driving element is driven in one direction, a flexible transmission shaft driven by said gearing and adapted to rotate in only one di rection. a tool driving shaft, and cooperating gearing connecting said tool driving shaft with said flexible shaft.

9. In a drilling tool, a power driving element adapted to be driven in opposite directions, cooperatin gearing driven thereby, manually releasable 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 driven by said gearing, a flexible transmission shaft driven by said shaft and adapted to rotate in only one direction, a. transmission shaft driven by said flexible shaft, a tool driving shaft, and cooperating gearing connecting said third mentioned transmission shaft with said tool driving shaft, one of said shafts having reciprocatory movement relative to one of said latter ears during rotation thereof.

10. n a drilling tool, a power drivin element adapted to be driven in opposite irections, cooperating gearing driven thereby, manually releasable mechanism conneotin said gearing with said driving element, sai mechanism being automatically operative to prevent driving of said gearing when said driving element is driven in one direction, a

flexible transmission shaft driven by said gearing and adapted to rotate in only one direction, a tool drivin shaft, gearing connecting said flexible s iaft with said tool driving shaft, and a manually controllable clutch for connecting said last mentioned gearing to said tool driving shaft.

11. In a drilling tool, a power driving element, cooperating gearing driven thereby, a manually releasable ratchet mechanism connecting said gearing with said driving element, a flexible transmission shaft driven by said gearing, a transmission shaft driven by said flexible shaft, and a tool driven by said second mentioned transmision shaft.

12. In a drilling tool, a power driving element, cooperating gearing driven thereby, a ratchet mechanism for connecting said gearing with said driving element, manually o erable means for releasing said ratchet mec anism, a flexible transmission shaft driven by said gearing, a transmission shaft driven by said flexible shaft, 9. tool driving shaft,

and means including a manually controllable clutch for connecting said two last mentioned shafts.

13. 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 means forrendering said ratchet.

mechanism inoperative, a flexible transmission shaft driven by said gearing, a transmission shaft driven by said flexible shaft, a tool driving shaft, cooperating gearing connecting said two last mentioned shafts, and a manually controllable clutch for connecting said gearing to said'tool driving shaft.

14. 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 screw operated means for rendering said ratchet mechanism inoperative, a flexible transmission shaft driven by said gearing, and a drilling tool driven by said flexible shaft.

15. In a drilling tool, a power driving element, cooperating gearing driven thereby, a manually controllable clutch connecting said gearing with said driving element, a flexible transmission shaft driven by sai gearing, a transmission shaft driven by said flexible shaft, cooperating gearing driven by said transmission shaft, said transmission shaft being connected in operativensliding relation with one of the gears of said last mentioned caring, a tool driving shaft, and a manual y controllable clutch connecting said last mentioned gearing with said tool driving shaft.

16. In a drilling tool, a power driving ele ment rotatable in opposite directions, coop-.

erating 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 means for rendering said ratchet mechanism inoperative, a flexible transmission shaft driven by said gearing, and a drilling tool driven by said flexible shaft.

17. 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 means for rendering said ratchet mechanism inoperative, a flexible transmission shaft driven by said gearing and adapted to rotate in only one direction, a tool driving shaft, cooperating gearing driven by said transmission shaft, and a manually controllable clutch for connecting said last mentioned gearing to said tool driving shaft.

18. 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 driven in one direction, resilient means for maintaining said ratchet mechanism in operative position, manually operable means for overcoming said resilient means to render said ratchet mechanism in operative, a flexible transmission shaft driven by said gearing adapted to rotate in only one direction, cooperating gearing driven thereby, a tool driving shaft, and a manually operable clutch for connecting said last mentioned gearing to said tool driving shaft.

19. In a drilling tool, a power driving element, bevel gearing driven thereby, a ratchet mechanism for connecting said driving element with one of the gears of said gearing, said mechanism comprising coo erating rachet elements, and a spring for fiircing said elements together, manually operable means for separating said ratchet elements to render said ratchet mechanism inoperative, a flexible transmission shaft driven by said gearing, a transmission shaft driven by said flexible shaft, cooperating gearing driven thereby, a tool driving shaft, and a manfually controllable friction clutch for connecting said last mentioned gearing to said tool driving shaft.

20. In a drilling tool, a power driving element rotatable in opposite directions, bevel 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 means for separating said ratchet elements to render said ratchet mechanism inoperative, a flexible transmission shaft driven by said gearing, a transmission shaft driven by said flexible shaft, a tool driving shaft. and means including a manually controllable friction clutch for connecting said two last mentioned shafts in driving relation.

21. In a drilling tool, a power driving element rotatable in opposite directions, bevel 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 ele ments, and a spring for forcing said elements together, manually operable means for separating said ratchet elements to render said ratchet mechanism inoperative, a flexible transmissionshaft driven by said gearing Inn and adapted to rotate in only one direction, a transmission shaft driven by said flexible shaft, cooperating gearing driven by said last mentioned transmission shaft, a tool driving shaft, and a manually controllable friction clutch for connecting said last mentioned gearing to said tool driving shaft.

22. In a drilling tool, a power driving element, cooperating gearing 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 rotating directly with one of said gears, a flexible transmission shaft driven by said gearing, and a tool driven by said flexible shaft.

24. In a drilling tool, a power drivin element, cooperating gearing driven there y, a ratchet mechanism for connecting one of said gears with said driving element, said ratchet mechanism comprising cooperating ratchet elements, and a spring for forcing said elements together, one of said ratchet elements rotating directly with one of said gears, means for rendering said ratchet mechanism inoperative including manually operable means for forcing said ratchet elements apart, a flexible transmission shaft driven by said gearing, a tool driving shaft, and means including a manually controllable friction clutch for connecting said flexible shaft in driving relation with said tool driving shaft.

25. In a drilling tool, a power driving element, cooperating gearing driven thereby, manually releasable mechanism connecting said gearing with said driving element, a flexible transmission shaft driven by said gearing, a reciprocable transmission element driven by said flexible shaft, a tool driving shaft, and means including a manually controllable clutch connecting said reciprocable transmission element in driving relation with said tool driving shaft.

25. In a drilling tool. a ower driving element, cooperating gearing riven thereby, and gears of said gearing being rotatable on angularly related axes, a flexible transmission shaft driven by said gearing, a swivel mounting for said flexible shaft rotatable about the axis of one of said gears, and a drilling tool driven by said flexible shaft.

26. In a drilling tool, a power driving element, cooperating gearingedriven thereby, the gears of said gearing ing rotatable on angularly related axes, a flexible transmission shaft driven by said gearing, a swivel mounting for said flexible shaft rotatable about the axis of one of said gears, a transmission shaft driven by said flexible shaft, cooperating gearing driven by said second mentioned transmission shaft, a tool driving ment, a drill bit, and driving connections shaft, and a manually controllable clutch connecting said tool driving shaft with said last mentioned gearing.

27. In a drilling tool, a power driving elebetween said driving element and said bit including a flexible transmission shaft, and means including a manually controllable friction clutch between said flexible shaft and said drill bit.

28. In a drilling tool, a power driving element, a cutting bit, driving connections between said driving element and said bit including cooperating gearing, a flexible shaft, and a reciprocable transmission shaft driven by said flexible shaft and having operative sliding connection. with one of the gears of said gearing.

29. In a drilling tool, a motor, a power driving element rotatable thereby in opposite directions, a cutting bit, and power transmission means between said driving element and said bit including means for automatically rendering said transmission means inoperative upon rotation of said driving element in one direction and a flexible transmission element between said automatic means and said bit.

30. In adrilling tool, a power driving element rotatable in opposite directions, a cutting bit, and power transmission means between said driving element and bit including ratchet mechanism for automatically rendering said transmission means inoperative upon rotation of said driving element in one direction, and manually operable means for releasing said ratchet mechanism at will operative to effect disengagement of the parts of the latter.

31. In a drillin tool, a power driving element, a cutting bit, and flexible transmission means between said driving element and said bit includin a wire rope transmission shaft, and flexib e housing means for said shaft.

32. In a drilling tool, a power driving element, a cutting bit, and flexible transmission means between said driving element and said bit including a wire rope transmission shaft, and flexible housing means for said element, a portion of said wire rope having a reciprocatory movement during rotation thereof.

33. In a drilling tool, a frame,,a power driving element carried thereby, a hole drilling device actuated by said driving element and connected to said frame by power transmitt-ing means operative to effect rotation of said device on its axis in any position thereof and permitting translative movement of the drilling device bodily in any direction relative to said driving element, said means including elements having pivotal connection Wit-h said frame.

I shaft and a ment rotatable in opposite directions, a tool, and transmission means between said driving element and tool including a wire rope transmission element adapted to drive said tool in only one direction and mechanism automatically releasable upon rotation of said driving element in a reverse direction to prewent the uncoilin of the wire rope strands. In testimony w iereof I aflix my si ature.

MORRIS P. HOL ES.

position relative thereto, said bit being carried at the outer end of said shaft.

10 35. In a. drilling tool, a power driving ele- CERTIFICATE OF CORRECTION.

Patent No. 1,667,156. Granted April 24, 1928. to

MORRIS P. HOLMES.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 41 for the tmsspelled, word "sproket" read "sprocket", line 99, for the word "at" first occurrence read "as", and line 107, for "thread" read "threaded"; page 3 line 123 for thnst" read "thrust"; page 5, line 97. claim 9, after the word "liaving" insert t he art cle a"; page 6, line 78, claim 18, after the word "gearing" insert the word and same page, line 89, claim 19, for "rachet" read "ratchet"; page 7 lines 19 and 36, for claim numbers "24" and "25" read "23" and "24"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of May, A. D. 1928.

M. J. Moore,

(Seal) Acting Commissioner of Patents.

I shaft and a ment rotatable in opposite directions, a tool, and transmission means between said driving element and tool including a wire rope transmission element adapted to drive said tool in only one direction and mechanism automatically releasable upon rotation of said driving element in a reverse direction to prewent the uncoilin of the wire rope strands. In testimony w iereof I aflix my si ature.

MORRIS P. HOL ES.

position relative thereto, said bit being carried at the outer end of said shaft.

10 35. In a. drilling tool, a power driving ele- CERTIFICATE OF CORRECTION.

Patent No. 1,667,156. Granted April 24, 1928. to

MORRIS P. HOLMES.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 41 for the tmsspelled, word "sproket" read "sprocket", line 99, for the word "at" first occurrence read "as", and line 107, for "thread" read "threaded"; page 3 line 123 for thnst" read "thrust"; page 5, line 97. claim 9, after the word "liaving" insert t he art cle a"; page 6, line 78, claim 18, after the word "gearing" insert the word and same page, line 89, claim 19, for "rachet" read "ratchet"; page 7 lines 19 and 36, for claim numbers "24" and "25" read "23" and "24"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 29th day of May, A. D. 1928.

M. J. Moore,

(Seal) Acting Commissioner of Patents.

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