US1605712A - Drilling machine - Google Patents

Description

Nov. 2 1926.

G. H. GILMAN DRILLING MACHINE Filed Jan. 10, 1920 4 Sheets-Sheet 1 rlllllllll Inventor: gefl. ilinan, 22,, m r W cfliiys.

Nov. 2 1926.

G. H. GILMAN DRILLING MACHINE Filed Jan. 10, 1920 4 Sheets-Sheet 2 \0 MM bm Rub M Illa IA! .MJ

2 hm \mlm mm m. vm V w Inventor.-

jY. Gila nan,

Georg Nov. 2 1926.

G. H. GILMAN DRILLING MACHINE Filed Jan. 10. 1920 4 Sheets-Sheet 5 m HI m 4 "I! t w m 6 s l t 9 e h s 4 w Nmm Am. M G m New .mw Gw hm F a H mm. 2 W hm N lnvewiov: George)! 6mm, bH 7 MW;

Patented Nov. 2, 1926.

UNITED STATES GEORGE H. GILMAN, OF BOSTON, MASSACHUSETTS.

DRILLING MACHINE.

Application filed January 10, 1920. Serial No. 350,677.

My invention relates to drilling machines and will be best understood from the following description when read in the light of the accompanying drawings of several specific embodiments of my invention selected for illustrative purposes, while the scope of my invention will be more particularly pointed out in the appended claims.

In the drawings:

Fig. 1 shows an elevation of one embodiment of my invention.

Fig. 2 shows an elevation at right angles to Fig. 1 and partial section on the line 2-2 of Fig. 1.

' Fig. 3 shows a section on theline 33 of F3 2.

Figs. 4, 5 and 6 respectively show sections on the lines 44, 55 and 66 of Fig. 3.

Figf'? shows an elevation of a mounted hammer drill parts being shown in section,

and

Fig. 8 shows a section on the line 8-8 of Fi Ely invention is shownin Figs. 1 to 6 as embodied in a hand hammer and in Figs. 7 and 8 is embodied in a mounted hammer drill. These machines generally speaking comprise a hammer piston which is adapted to impart percussion to a drill steel, the latter being held in a. chuck rotated by a rotary fluid pressure motor provided with reduction gearing operatively connected to the chuck. My invention althou h it compre; hends percussive tools is not imited exclusively thereto and includes within its scope drills which cut by rotative action alone.

Referring particularlyto Figs. 1 to 6 I have illustrated a cylinder member 1 rovidedvwitha piston 2 reciprocated by uid pressure controlled by any suitable means,

and closing the front end of the cylinder a cylinder head 3 herein formed seiaratel from the cylinder member and provi ed wit an extension or sleeve 4 providing a reduced diameter portion for the cylinder within which is received a striking pin 5'and the hammer bar 6 which serve to transmit the momentum of the pistofi 2 to the drillsteel.

It'will be understood by those skilled in this art that the striking pin may be omitted and the hammer bar a one be used to transmit the momentum of the piston to the steel and in which case the hammer bar shown may be lengthened approximately a distance equal 3 and the casing 10.

to the longitudinal dimension of the strikmg pm.

In this illustrative embodiment of my invention surrounding the sleeve member 4 of the cylinder is a casing 8 provided with a transverse portion 9 bearing on the sleeve and forwardly of the casing'8 is a second casing 10 while rearwardly of the cylinder member is a rear cylinder head 11 which carries the handle 12, the arts just enumerated being held in assembles relation by means of the side bolts 13 which herein extend from the rear cylinder head 11 to the frontend of the casing 10 as is clearly shown in Fig. 2. As illustrated the casing 8 serves as the motor casing for the chuck rotating motor which herein comprises the gear members 14, 15 and 16, and to house a reduction gearing hereinafter described, and further serves as a spacing means between the cylinder head The casing 10 hereinafter termed the chuck casing has mounted therein the forward portion of a chuck 17, said chuck as illustrated bein rovided with an enlarged portion 18 whic as a bearing on the forward end of the sleeve portion4 of the cylinder.

In the articular embodiment of my invention illiistrated the gear member 15 of the motor, which as shown is rotatably mounted on the sleeve 4, forms a rotary piston with which mesh the gear members 14 and 16, forming rotary abutments for this piston. Motive fluid, preferably com ressed air, is supplied the motor by suitab e assages herein indicated at 19 and 20, w ich passages communicate in any convenient manner with the source of motive fluid supply for the machine and open into: the interior of the casing 8 adjacent the points of intersection of the ear members 14 and 16 with the gear memfier 15.

As illustrated the gear members 14 and 16, herein constituting rotary abutments for the gear memberor rotary piston 16, are carried b shafts 21 situated at opposite sides of the -s eeve member 4 in parallelism therewith, t

ear members 14 and 16 being. illustrat ierein as secured in non-rotatable relation to the respective shafts 21 by keys 45 Fig. 2).

The shafts 21 are herein mounted in arings 22 and 23 respectively situated in the front cylinder head 8nd in the chuck casing 10, and as illustrated formed integrally with each shaft are pairs of eccentrics 24 and 25 positioned approximately 180 apart as clearly indicated in Fig. 2, which figure for convenience of illustration shows the eccentrics rotated around 90 from the position of the eccentrics in the other figures. As illustrated, connecting 0 posite eccentrics are a pair of yokes 27 an 28 provided with cylindrical openings which adapt them to surround the rearward portion 18 of the chuck the inner periphery of the openings being provided with internal gear teeth 29 meshing with gear teeth 30 formed on the chuck. In order among other things to neutralize vibration I have herein rovided two yokes both of which are rovi ed with gear teeth meshing with the c uck, and the eccentrics are set with relation to each other as above specified to give each yoke a gymtory motion which at any given time moves one yoke in the opposite direction to the other. As the yokes gyrate the toothed portions thereof roll about the toothed portion of the chuck and for one revolution of the teeth of the yoke the chuck is advanced a distance corresponding to the difi'erence between the number of teeth on the respective parts thereby providing a great speed reduction.

It will be observed from the foregoing description that I have provided fluid ressure actuated means for rotating the c uck comprising an annular gear mounted for gyratory movement.

In order to secure a compact arrangement in the submitted embodiment of my invention the shafts 21 are made hollow and surround the side bolts 13. It will be noticed that the cylinder head 3 and the chuck casing form closures for the casing 8 which herein -forms the motor casing for the chuck rotating motor and contains the reduction gearing, and that the bolts 13 act as securing means for holding these parts in assembled relation.

It will be observed by comparison of Figs. 3, 4, 5 and 6 that in the submitted embodiment of my invention the motor, gearing, and cylinder member are each generally elliptical in outline, having their respective minor and major axes substantially in the same planes and having their corresponding,

transverse dimensions or cross-sectional areas substantially embraced within the confines of the corresponding pro'ected dimensions or cross-sectional areas 0 each of the others. In other words, Figs. 4, 5, and 6 each show sections generally elliptical in outline and having minor and major axes of substantially the same length, and illustrate parts which in the assembled rock drilling machine are organized in coaxial relation to each other in such manner that one is symmetrically superimposed upon the other, the cylinder, chuck, yokes, and motor herein in the assembled machine being in encircling relation to the axial line of said cylinder. It will be understood that herein the yokcs move about the axial line of the piston so that the yokes as operating parts remain in substantially coaxial relation therewith, their major and minor axes not deviating during such motion in marked degree from the planes defined b the corresponding major and minor axes 0 the motor and cylinder.

For many kinds of rock drilling reciprocating motors for rotating the chuck and mechanical means for the same purpose have proven unsatisfactory. To overcome the dif ficulties incident to these forms of mechanism for rotating the chuck it has been proposed to employ an independent rotary motor for the purpose, and heretofore in at tempting to solve this problem it has been found that a rotary motor when organized with the other parts of the machine creates a structure which is so cumbersome and bulky that the machine can be used in confined situations, as for example close to a wall or in a cleft between rocks, only with extreme ,ditficulty, if at all. It will be observed that with machines constructed according to the submitted embodiments of my invention, as for example the hand hammer constructed according to Fig. 1, these disadvantages of prior rock dri-lls employing independent motors are eliminated by the employment of a rotary motor and reduction gearing, each of which is generallyof the same cross-sectional shape and size as the cylinder and is coaxial t erewith, the motor and gear further being substantially annular to permit them to be compactly arranged with the cylinder. It will further be observed that in this embodiment of my invention I have provided flattened structures for housing the motor andthe reduction gearing, and that the minor transverse dimension of these structures is substantially that of the corres ondi dimension of that part of the cylin er WhlCl'l houses the large diameter portion, of the piston. In other words, it will be observed that both the motor and reduction gearing are of such character and shape as to permit them to be organized with the conventional forms of rock drills without forming a bulky structure, the rock drill, for example that herein constructed according to Fi 1, being capable of use in substantially t e same restricted situations as if the motor and reduction gearing were omitted. At the same time thereduction gearing possesses the merits of simplicity and ruggedness and can be organlzed with the motor without undue complexity of transmission mechanism.

In the modification shown by Fi s. 7 and 8 my invention is shown as emb ied in a mounted drill comprising a cradle 40 provided with guide-ways 41 and a feed screw 42 coacting with the nut 43 and serving to move the drilling machine along the guides. In other respects this modification is similar to that shown by Figs. 1 to 6.

It will be understood by those skilled" in the art that in common practice in drilling rock the drill steel is changed for every two to three feet of advance of the drill hole, and as the drill hole is advanced on the average of from 12 to inches per minute the drill steel in consequence must be changed frequently. It is therefore of importance in a mounted machine, such as is illustrated b Figs. 7 and 8, to form the machine witli an absence of protuberanccs. which will revent ready withdrawal of the drill steel rom the drill -hole and insertion of a new drill steel during the operation of changing drill steels. .In all mounted rock drills heretofore proposed in which a rotary chuck motor is provided a bulky structure has resulted extending beyond the normal confines of the dimensions of the cylinder as operative wholes having each a long and bod and with such machines the changing rill steels has been rendered exceedingly diflicult, and especially when the motor has been located at the front end of the machine. It will be appreciated that if the machine interferes with the withdrawal of the drill steel the cradle must be moved in order to permit this operation, with the result that the amount of rock drilled during a shift will be materially decreased. It will further be observed from Figs. 7 and 8 that I have herein provided a mounted machine in which the motor and reduction gear permit the hammer drill to be placed close to the feed screw and without formin a structure which will interfere with the rill steel during the operation of changing drill steels.

Placing the hammer close to the feed screw minimlzes the stresses set up in the feed screw by the recoil of the hammer drill.

Although I have described several modifications of my invention it is to be understood that within the scope of the appended claims the same is susceptible ,of other modifications without departing from the spirit thereof.

Claims 1. In a rock drill, a percussive motor comprising a cylinder member, a drill chuck, a chuck rotating motor comprising three mesh-' ing gear members arranged side "by side and acte upon by fluid pressure, reduction gearing comprising a gyratory member operatively connectin said motor and chuck, the middle gear mem r of said chuck rotating motor and said reduction gearing being axially aligned with said cylinder member, and said motor and reduction gearing being substantially embraced within the confines of the projected cross-sectional area of said cylinder member.

2. In a rock drill, a percussive motor cylmember for gyrating inder member, a chuck, a chuck rotating motor comprising a plurality ofmeshing gear members acted upon by fluid pressure, gyratory reduction gearing substantially coaxial with said chuck operatively connecting said chuck and its rotating motor, said chuck rotating motor and gearing each being carried by said cylinder member, and/as operative wholes having each a long and a short axis, the corresponding axes of each substantially lying in the same longitudinal of said cylinder member.

'3. In a rock drill, a percussive motor cylinder member, a chuck, a chuck rotating motor comprising three gear members acted so it upon by fluid pressure and lying diametri- I cally side by side, the middle gear member of said motor being coaxial with said chuck, gyratory reduction gearing substantially coaxial with said chuck operatively connecting said chuck and said motor, said chuck rotating motor and gyratory gearing each being carried by said cylinder member and a short transverse axis. the corresponding axes of each substantially lying in the same plane longitudinal of said cylinder member and the short axes being substantiallyembraced within the corresponding transverse dimension of said cylinder.

4. In a rock drill, a cylinder, :1 reciprocatory fluid actuated hammer piston in said cylinder, a chuck carried by said cylinder in rotatable relation thereto, said chuck formed for caning a drill steel in non-rotatable relation th ereto, an internal gear surrounding said chuck, external gear teeth carried by said chuck and meshing with said internal gear, eccentrics at opposite sides of said chuck, said internal ear being mounted on said eccentrics and being gyrated thereby about the axis of said chuck, a gear aligned with each eccentric and connected in driving relation thereto, a third gear coaxial with said hammer piston and meshing with each of said first mentioned gears, a casing for said gears forming therewith a rotary ex ansible chamber type motor, and means or admitting motive fluid-to said casing for operating said motor.

- 5. In a rock drill, a cylinder, a reciprocatory fluid actuated hammer piston in said cylinder, a chuck carried by said cylinder in rotatable relation thereto, said chuck formed for carrying a drill steel in nonrotatable relation thereto, an annular series of gear teeth carried by said chuck, a memberhaving asecond annular series of gear teeth eccentric to 'and meshing with said series carried by saidchuck, eccentrics at opposite sides of said chuck carrying said said member about the axis of sald chuc a\gearaligned with each eccentric and connected in driving re lati on thereto, a third gear coaxial with said a fluid actuated rotary member in the form of a ring mounted coaxially with said pismeshing with an yoke and chuck encirclin ton and surrounding said percussive mechanism, eccentrics at opposite sides of said chuck, means connecting said eccentrics to said motor for driving them in the same direction, said chuck carrying an annular series of gear teeth coaxial] y arranged therewith, a member having an annular series of gear teeth meshing with and eccentric to said annular series carried by said chuck, and said member being carried by said eccentrics and being gyrated thereby about the axis of said chuck.

7. In adrilling machine, a cylinder, a fluid actuated .hammer piston, a chuck formed for carrying a drill steel, a fluid actuated chuck rotating motor delivering continuous uni-directional motion, reduction gearing connecting said motor and chuck, said reduction aring comprising agyratory yoke 'surroun ing said chuck and having an annular series of gear teeth eccentric to and annular series of gear teeth operatlvely connected to said chuck, said the axial line of said iston, and said yo e gyrating about said e.

.8. 'In a drilling machine, a cylinder, er-' cussive mechanism .for forming the rill hole comprisin a hammer piston in said cylinder, a chuc formed for can ing a drill steel, a fluid pressure operated luck rotatmg motor comprising three meshing gear members arranged substantially diametrically side by side, the central one of said gear members being in the form of a ring surrounding said percussive mechanism, and reduction gearing connectinglthe outside of said members to-said c uck.

9. a drilling machine, a, cylinder, a

hammer piston in said cylinder, a chuck formed for carrying a drill steel, a fluid pressure 0 rated chuck cotating'motor commeshing gear members arranged substantially diametrically side-by side, reduction gearing comprising a gyratory oke surrounding said chuck and'operativ y connecting one of the outside of said gar members to said chuck, said yoke and e central one of said three gear members encircling the axial line of said piston, and said yoke gyrating about said line.

10. In a drilling machine, a cylinder, a hammer piston in said cylinder, a chuck formed for carrying a drill steel operated by said hammer piston, a yoke having an annular portion through which said chuck extends, oppositely disposed eccentric members exteriorly of said chuck carrying and adapted to gyrate said yoke about the axis of said chuck, shafts on which said eccentric members are mounted, means including a motor carried by said cylinder for driving said shafts in unison, and a spur gear connection between said annular portion of said yoke and chuck.

11. In a drilling machine, a cylinder, percussive mechanism for forming the drill hole comprising a hammer piston, a chuck formed for carrying a drill steel, a yoke operaatively connected to said chuck and having an annular portion surrounding said percussive mechanism, oppositely disposed eccentric members for gyrating said yoke, shafts at the side of said machine and on which said eccentric members are mounted, means for driving1 said shafts in unison comprising gear w eels mounted on said shafts and an intermediate ear meshing with said first named gears, said intermediate gear being coaxial with said iston and surrounding said percussive sure motor means for rotating said gears.

12. In a drilling machine, a cylinder carrying a hammer piston, a chuck formed for carrying a drill steel, a ring gear substantially aligned with said chuck and rotatably supported relatively to said cylinder, a yoke surrounding said chuck and operatively connected thereto, a pair of smaller oppositely disposed gears meshing with said aligned gear, motor means for rotating said gears, shafts ali ned with and driven by said second mentioned gears, and means on said shafts for gyratin said yoke, said rin gear being substantial y coaxial with sai c linder and said .yoke encircling the axial hne of said cylinder.

13. In a drilling machine, a percussive motor comprising a cylinder having a front head structure, a chuck formed for carrying a drill steel, said clutch supported in said front head structure for rotation relatively to said cylinder, motor means for rotating said chuck, a reduction gear for transmitting the motion of said motor to said chuck an comprisin a gyrating yoke housed 1n said front has structure, said yoke having an annular portion geared to and encircling said chuck.

a 14. In a drilling. machine, a percussive motor comprising a cylinder having a front head structure, a motor havin' spaced rotary members housed in said front ead structure, a chuck housed in-said front head structure mec anism, and fluid presmoan:

and supported for rotation relativel to said cyllnder, a yoke housed in said ront head structure and having an annular portion eccentric to the axis of said cylinder, means driven by said rotary members for gyrating said yoke about the axis of said cylinder, and means for admitting motive fluid to said head structure for operating said motor.

15. In a drilling machine, a ercussive motor cylinder member having a rent head structure the minimum transverse dimension of which is substantially that of the corresponding transverse dimension of said cylinder, shafts in said front head structure at opposite sides thereof, eccentrics on said shafts, a yoke in said front head structure carried by said eccentrics, a chuck surrounded by said yoke and operatively connected to said yoke, and motor means for rotating said shafts in unison.

16. In a drilling machine, a percussive motor cylinder, a front head structure therefor, members securing said structure to said cylinder, a chuck, a yoke for rotating the same, shafts mounted concentrically with said securing means, means on said shafts for rating the yoke, and means for rotating t e shafts.

17. In a drilling machine, a percussive motor cylinder, a front head structure therefor, members securing said structure to said cylinder, a chuck, a yoke for rotatin the same, and means mounted concentrically with said securing members for gyrating the yoke.

.18. In a drilling machine, a percussive cylinder containin a hammer lston and having a cylinder ead, a chuck ormed for carrying a drill steel, a chuck casing, a spacing member between said head and casing, a chuck rotating motor and reduction gearing comprising a gyrating yoke having an annular portion surrounding means for transmitting percussion to the b t of said drill steel, said motor and gearing being housed by said spacing member and said spacing member forming a motor casing for said motor, means for admitting motive fluid to said motor casing for operating said motor, and means for securing said chuck casing-to said c linder.

19. In a dril ing machine, a percussive cylinder containin a hammer iston and having a cylinder ead, a chuck ormed for carrying a drill steel, a chuck casing, 22. spacing member between said head and casing, means securing said chuck casing to said cylinder, agyratory yoke operatively connected in driving relation to said chuck and having an annular portion surrounding means for imparting percussion to the bit of said drill steel, said yoke being housed by said spacing member, a pair of eccentrics in said spacing member for gyrating said yoke, a motor in said spacing member comprising a plurality of rotary members, and means for admitting motive fluid to said casing for driving said rotary members of said motor.

20. In a drilling machine, a casing, front and rear closures therefor, hearings in said closures supporting oppositely arranged shafts, means for rotatin said shafts, a yoke, means 0 erated by sald shafts for gyrating said yo (e, a chuck connected to said yoke, and securing means for said closures extending through said shafts.

21. In a drilling machine, a cylinder member, a cylinder head having an extension, a chuck, a chuck casing, said chuck havin an exterior bearing on said chuck casing and an interior bearing on said extension, a spacing member between said head and chuck casing, means for securing said chuck casing to said cylinder member, a motor and reduction gearing for rotating the chuck, and said motor and gearing being housed by said spacmg mem er. r

22. In a drilling machine, a cylinder, a cylinder head having an extension, a geared member surrounding said extension, :1 chuck, said chuck having a bearing on said extension, driving mechanism between said geared member and chuck comprising a second eared member located at the side of said first mentioned geared member and in mesh therewith, and a gyratory yoke surroundin said extension and driven by said second mentioned geared member.

23. In a drilling machine, acylinder, :1 cylinder head having an extension, a geared member surrounding said extension a chuck, driving mechanism between said geared member and chuck comprising a second geared member located at the side of said rst mentioned geared member and in mesh therewith, and a gyratory yoke having an annular portion surrounding said chuck and driven by said second mentioned geared member.

24. In a drilling machine, a c linder, a hammer piston having a hammer ar a'cylinder head having an extension, said hammer bar adapted to enter said extension, a fluid pressure operated motor membersurrounding said extension and mounted for rotation, at chuck, and earin adapted to connect said motor mem er and chuck comprising a gyratory annular gear surroundmg said extension. v

25. -In a drilling machine, a support, a percussive motor slidably mounted on said support, said percussive motor having a cylinder relatively close to said support, a chuck, reduction gearing comprising a gyratory gear operatively connected to said chuck, said gyratory gear ibeing aligned with said cylinder and aving a transverse dimension relatively longer than the transverse dimension at right angles thereto, said longer dimension being substantially parallel to the plane of the support, and means for moving said percussive motor along the support.

26. A drilling machine having in combination, a fluid operated hammer drill comprising a casing in which is mounted a reciprocatory hammer piston and a rotary chuck formed for carrying a drill steel, a mounting for said casing having longitudinally extending guides supporting said casing in relatively close relation thereto for longitudinal feeding movement. a motor and reduction gearing for rotating said chuck, said motor and reduction gearing being housed by said casing, said motor having three meshing gears arranged diametrically side by side on diameters in a plane parallel to the plane of said guides, the central gear being coaxial with said casing, eccentrics aligned with and driven by the outer two of said three gears, an annular member mounted on said eccentrics and gyrated thereby about the axis of said casing, and a gear connection between said annular member and chuck.

27. A drilling machine having in combination, a fluid operated hammer drill comprising a casing in which is mounted a reeiprocatory hammer piston and a rotary chuck formed for carrying a drill steel, a mounting for said casing having longitudinally extending guides supporting said casing in relatively close relation thereto for longitudinal feeding movement, a feed screw relatively close to said casing for moving said casing along said guides, 11 motor and reduction gearing for rotating said chuck, said motor and reduction gearing being housed by said casing, said motor having three meshing gears arranged diametrically side by side on diameters in a plane parallel to the plane of said ides, the central gear being coaxial with said casing, eccentrics aligned with and driven by the outer two of said three gears, an annular member mounted on said eccentrics and gyrated thereby about the axis of said casmg, and a gear connection between said annular member and chuck.

28. In a rock drill, a cylinder, a piston in said cylinder having a hammer bar, a chuck, a chuck rotating motor comprising an annular rotary member actuated by fluid pressure positioned to surround said hammer bar in at least one position of the piston, an annular casing. for said rota member, means for admitting pressure Hard to said casing for effecting rotation of said rotary member, means comprising an annular gyratory gear for operatively connecting said rotary member to said chuck; said rotary member being substantially coaxial with said piston and said gyratory gearencircling and gyrating aboutv the axial line of said piston, and means for securing said casing tosaid cylinder.

29. In a drilling machine. a piston having a larger and a smaller diameter portion, means forming a casing for said piston, said casing having a smaller and larger diaircter portion, a chuck. a motor for driving -said chuck and comprising a rotary member operated upon by fluid pressure and surrounding said smaller diameter por tion of said casing, a reduction gear for driving said chuck comprising an annular gear gyrated by said motor about the axis of said rotary member, said rotary member and annular gear encircling the axial line of said piston.

30. In a drilling machine, a piston having a larger and a smaller diameter portion, means forming a casing for said piston, said casing having smaller and larger diameter ortions, a chuck, a motor for driving saic chuck and having a pair of meshing rotary gears operated upon by fluid pressure one of which surrounds the smaller diameter portion of said casing, and a reduction gearing operatively connect-ed to the other of said rotary gears and comprising an annular gear; said rotary gear which surrounds said casing and said annular gear both encircling the axial line of said piston.

31. In a rock drill, a cylinder, a hammer piston in said cylinder, a rotary chuck formed for carrying a drill steel, a gear coaxial with said piston, relatively smaller gears meshing with said first named gear, eccentrics aligned with and driven by said smaller gears, a yoke for driving said chuck and having an annular portion surrounding the.

axis of said cylinder, said yoke being mounted on said eccentrics, the three meshing gears having their axes in a. plane corresponding to the median position of the major axis of said yoke, and the minor axis of said yoke and said gear coaxial with said piston being embraced in the major projected cross-sectional area of said cy1- inder.

32. A rock drill having in combination, a casing, a hammer piston reciprocably mounted in said casing, a chuck formed for carrying a drill steel and being rotatably mounted in said casing, fluid ressure actuated means for rotating said c iuck comprising a yoke surrounding the rearward end of said c iuck, means including an eccentric. for

efiecting gyratory motion of said yoke, and internal gear teeth on said yoke meshing with gear teeth on said chuck.

33. A rock drill having in combination, a casing, a hammer piston reciprocably mounted in said casing, a chuck formed for carrying a drill steel and being rotatable relatively to said casing, fluid pressure actuated means for rotating said chuck comcasing, a

prising a yoke mounted for gyratory movementand carrying an annular series of gear teeth eccentrically to the axis of said chuck, and a second annular series of gear teeth in operative relation to said chuck for driving said chuck and meshing with the first mentioned annular series of gear teeth.

34. A rock drillhaving in combination, a hammer piston reciprocably mounted in said casing, a chuck formed for carrying a drill steel and being rotatable relatively to said casing, fluid pressure actuated means for rotating said chuck comprising a yoke mounted on a plurality of spaced eccentrics for gyrating movement and carrying an annular series of gear teeth eccentrically to the axis of said chuck, and a second annular series of gear teeth in operative relation to said chuck for driving said chuck and meshing with the first mentioned annular series of gear teeth.

35. A rock. drill having in combination, a casing,- a hammer piston reciprocably mounted in said casing, a chuck formed for car ing a drill steel, said chuck being rotata le relative to said casing, fluid pressure actuated means for rotating said chuck comprising an annular gear mounted for gyra tory movement and having an annular series of gear teeth eccentric to the axis of said chuck, a second annular series of gear teeth in operative relation to said chuck for driving the latter and meshing with the first mentioned series of gear teeth, said annular gear and chuck encircling the axial line of said piston, and said gear gyrating about said line.

36. A rock drill having in combination, a casing, a hammer piston reciprocably mounted in said casing, a chuck formed for carrying a. drill steel, said chuck being rotatable relative to said casing, motor and reduction gearing means actuated by fluid pressure for driving said chuck comprising an annular member mounted for gyratory movement, said annular member and said chuck encircling the axial line of said piston, and said gear gyrating'about said line.

37. In a drilling machine, a cylinder, a chuck formed for carrying a drill steel, fluid actuated percussive means within said cylinder for operating said steel, said chuck mounted for rotation relatively to said cylinder, reduction gearing including a gymtory gear for driving said chuck, said gear with respect to its axis of movement being coaxial with said chuck, a fluid actuated rotary motor comprising a gear member surrounding said cylinder and a second gear member located at the side of said cylinder and meshing with said first gear member, and driving means for said gyratory gear at the side of said cylinder operatively con meeting said second mentioned gear member to said reduction gearing.

38. In a drilling machine, a cylinder, a chuck formed for carrying a drillsteel, fluid actuated percussive means within said cylinder for operating said steel, reduction gearing comprising a gyratory gear for driving said chuck, said gear with respect to its axis of movement being coaxial with said chuck, a rotary motor comprising a gear member surrounding said cylinder, a plurality of gear members at the side of said cylinder and meshing with said first mentioned gear member, and driving means operatively connecting one of said last mentioned gear members to said gyratory gear comprising an eccentric for effecting gyration of said gyratory gear.

39. In a drilling machine, a cylinder, a chuck formed for carrying a drill steel, fluid actuated percussive means within the cylinder for operating said steel, said chuck journalled on said cylinder, a fluid actuated rotary motor surrounding said cylinder and comprising a member journalled on said cylinder, and reduction gearing connecting said motor and chuck for rotating the latter, said reduction gearing comprising a gyrating yoke geared to said chuck and surrounding said cylinder..-- r

40. In a drilling machine, a cylinder, a chuck 'formed for carrying a drill steel, fluid actuated percussive means within said cylinder for operating said steel, a gear carried by said chuck, a rotary motor comprising a rotary member actuated by fluid pressure and surrounding said cylinder, a second rotary member at the side of said cylinder operatively connected in driving relation to the first mentioned rotary member, and reduction gearing for connecting said second rotary member to said chuck comprising a gyrating yoke surrounding the cylinder and having gear teeth meshing with said first mentioned gear.

41. In a drilling machine, a cylinder, a chuck formed for carrying a drill steel, a gear for said chuck, fluid actuated percussive means within said cylinder for operating said steel, a rotary motor comprising a gear member surrounding said cylinder and journalled thereon and a plurality of gear members at the side of said cylinder, a gyrating yoke surrounding said cylinder, means including a pair of eccentrics' driven by the side gear members for gyrating said yoke, and said yoke having a gear meshing with said ear for said chuck. 42. In a percussive rilling machine, a cylinder member, a hammer piston in said cylinder, a chuck formed for carrying a drill steel actuated by said hammer piston, said chuck supported in rotatable relation to said cylinder, a fluid pressure motor for rotating said chuck, said motor having an annular member provided with gear teeth and a second member rovided with gear teeth, the ar teeth ot said several members meshing, said annular member and said chuck surrounding said cylinder, reduction gearing connecting said motor and chuck, said reduction gearing comprising an annular gear, surrounding said cylinder, an eccentric driven by said motor for gyrating said annular gear, and casings for said motor and gearing surrounding said cylinder and being supported in non-rotatable relation thereto.

43. In a percussive drilling machine, a cylinder member, a hammer piston in said cylinder, a chuck formed for carrying a drill steel actuated by said hammer piston, said chuck supported in rotatable relation to said cylinder, a fluid pressure motor for rotating said chuck, said motor having an annular member provided with gear teeth and a second member rovided with gear teeth, the gear teeth 0 said several members meshing, said annular member and said chuck surrounding said cylinder, reduction gearing connecting said motor and chuck, said reduction gearing comprising an eccentric driven by said second member and an annular gear gyrated by said eccentric, and a casing for said motor and gearing surrounding said cylinder and being supported in non-rotatable relation thereto.

44. In a drilling machine, a chuck formed for carrying a drill steel,-a percussive cylinder, a hammer piston in said cylinder for operating said steel, a pair of intermcshing gear members located at the side of and parallel to said cylinder, a casing for said gear members, means for admitting motive fluid to said casing and causing it to act upon and to rotate said gear members, said chuck being rotatable relative to said cylinder, and a reduction gearing for operatively gonnecting said chuck and said gear memers.

45. In a. rock drill, a cylinder, a hammer piston in said cylinder, a chuck formed for carrying a drill steel operated by said hammer piston, said chuck having a rear wardl extending sleeve surrounding said cylin er, external gear teeth carried by said chuck, a gear surrounding said cylinder and meshing with a gear at theside of said cylinder, an eccentric at the side of said cylinder driven by said ear at the side of said cylinder, and a yo ecarry' internal gear teeth surrounding 'saidcyhnder and meshing with said external gear teeth carried by said chuck.

In testimony whereof, I have signed my name to this specification.

GEORGE H. GILMAN.

and a second member rovided with gear teeth, the gear teeth of said several members meshing, said annular member and said chuck surrounding said cylinder, reduction gearing connecting said motor and chuck, said reduction gearing comprising an annular gear surrounding said cylinder, an eccentric driven by said motor for gyrating said annular gear, and casings for said motor and gearing surrounding said cyl1nder and being supported in non-rotatable relation thereto.

43. In a percussive drilling machine, a cylinder member, a hammer piston in said cylinder, a chuck formed for carrying a drill steel actuated by said hammer piston, said chuck supported in rotatable relation to said cylinder, a fluid pressure motor for rotating said chuck, said motor having an annular member provided with gear teeth and a second member rovided with gear teeth, the gear teeth 0? said several members meshing, said annular member and said chuck surrounding said cylinder, reduction gearing connecting said motor and chuck, said reduction gearing comprising an eccentric driven by said second member and an annular gear gyrated by said eccentric, and a casing for said motor and gearing surrounding said cylinder and being supported in non-rotatable relation thereto.

44. In a drilling machine, a chuck formed for carrying a drill steel, a percussive cylinder, a hammer piston in said cylinder for operating said steel, :1 pair of internieshing gear members located at the side of and parallel to said cylinder, a casing for said gear members, means for admitting motive fluid to said casing and causing it to act upon and to rotate said gear members, said chuck being rotatable relative to said cylinder, and a reduction gearing for operatively (trlonnecting said chuck and said gear memers.

-15. In a rock drill, a cylinder, a hammer piston in said cylinder, at chuck formed for carrying a drill steel operated by said hammer piston, said chuck having a rearwardly extending sleeve surrounding said cylinder, external gear teeth carried by said chuck, a gear surrounding said cylinder and meshing with a gear at theside of said cylinder, an eccentric at the side of said cylinder driven by said gear at the side of said cylinder, and a yoke carrying internal gear teeth surrounding said cylinder and meshing with said external gear teeth carried by said chuck.

In testimony whereof, I have signed my name to this specification.

GEORGE H. GILMAN.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,605,712,

November 2,

anted 1926, upon'the application of George H. Gilman, of Boston, 'fi nmchusetts for an improvement in Drilling Machines, errors appear in the painted specification requiring correction as followszPage 2, line 64, strike out the word and comma cy1inder,; page 3 line 76, after the word same the said Letters Patent should be read with these insert the word'plaow; and that corrections therein that. the same mag conform to the record of the case in the Patent Ofiice; igned and sealed this 4th day of January, A. D. 1927.

[sun] M. J; MOORE, Acting Commissioner of Pate/nit.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,605,712, anted November 2, 1926, upon the ap lication of George H. Gilman, of Boston, usetts, for an improvement in Drilling ,Maehines, errors appear in the printed specification requiring correction as follows: Page 2, line 64, strike outthe word and comma cylinder,; page 3 line 76, after the word same insert the word plane; and that the said Letters Patent should be read with these corrections therein that the same ma. conform to the record of the case in the Patent Oflice;

igned and sealed this 4th day of January, A. D. 1927.

[HEAL] M. J. MOORE,

Airting Oommiuimaer 0/ PM.

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