US2271026A - Rock drilling apparatus - Google Patents

Description

F. E. slNcLAlR ROCK DRILLING APPARATUS Jan. 27, 1942.

Filed May 29, 1955 2 Sheets-Sheet 1 w Q gk @n ww xv W 1. E w ww.. .I l mw a. .Si @.M Alma@ @uw LW HHM. Lw uw 4%@ ,y A nl M um M, 1 0. 1F00 www@ a. M@ .@mw .QN d. 1@ Mum m. .fw s

Jan. 27, 1942. F. E. slNcLAlR ROCK DRILLING APPARATUS Filed May 29, 1935 U 2 Sheets-Sheet 2 w r ,lll 202 w iwal-MM,

Patented Jan. 27, 1942 Frank. Sinclair, Claremont, N, H., assignor to Sullivan v.Machinery Company, a corporation of Massachusetts Appiicauamay 29, 1935, serial No. y24,066 3s claims.y (o1. c55-45) This invention relatesto rock' drills, 4and more particularly to improvements vin automaticfeeding means for a hammer rock. drill of the mounted drifter type.

An object of this inventioni is to provide an improvedv automatic drill' feeding means. An-

other object is toprovide an improved automatic feeding means actuated andcontrolled bythe vibratory actionset `up within the drill hammer motor during operation ofthe latter and having embodied therein improvedy reversing means whereby the direction offeed of the hammer motor may be reversed at will.- Yet another ob-r ject is to provide an improved automatic drill feeding means having embodied' therein improved means for regulatingfthe rate of feed. VVA still further object is to provide an improved automatic feeding means controlled by the vibratory action set up within the drill hammer motor during operation thereof and having embodied therein improved means for-"modifying the intensityvof the vibratoryv action cf'the hammer motor transmitted to the feeding means'whereby the rate of feed may be varied. These and 'other objects will, however, hereinafter more fully for purposes of illustration one form which the invention may assumefin practice.' In these drawingsf Fig. 1 isa side elevational view, withparts shown in longitudinalvertical section, showing a drifter type rock drillembodying th'eillustrative form of the improved automatic feedin-gvmeans; Fig. 2 is an enlarged longitudinally extending vertical sectional view of the improved feed effecting and controlling means.I e

Fig. 3 is a cross sectionalviewtakenon line 3--3 of Fig. 2. i

Fig. 4 is across sectional view 4-4 of Fig. 2. Y

Fig. 5 isa cross -sectlonal view taken on line 5-5 of Fig. 2. y I Y Fig. 6 is a cross sectional view taken on line 6-6 ofFig.2.Y v 'f Fig. l7 is a detail sectional ,taken on line view taken on line 1-1 of Fig. 2. i

Fig. 8 is a detail sectional view taken on line 3 8 of Fig. 5.

In this illustrative embodiment of vthe invention there is shown a drifter type rock drill kof the pressure fluid actuated, :hammer type generally comprising a guide yshell I, la hammer motor 2 slidably guided thereon, and improved automatic feeding means generally designated 3.

The hammer'motor 2 isof an ordinary construction Vcomprising a cylinder '4 having a piston chamber 5 containing a reciprocatory hammer piston 6 for delivering impact blows to the shank of a drill steel 1 suitably mounted within the motor .chuck housing 8. Interposed'between the chuck housing 8 and the forward end of the cylinder is a Lfront head 9, while secured to the rear end of the cylinderv is a rear head block ID carrying a usual throttle valve mechanism Il for controlling the supply of'pressure fluid from a supply line I2 to the motor cylinder. Formed along the sides of the motor cylinder are laterally projecting guides I3 slidably received in longitudinal guideways I4 formed on the guide shell as is usual in a rock drill of the type disclosed. Theguide shell 'I is provided with a usual trunnion I5 adaptedto be clamped in the saddle mounting ofa suitable support.

'Now'referring to the improved automatic feeding means 3, it ywill be noted that secured by parallel supporting rods I6 to lthe rear end of the guide shell is a casing I1 housing elements of the improved feeding means for controlling the rotation of a feed screw I3 automatically in accordance with a vibratory action set up b-y the hammer motor during operation of the latter. The feed screw I8 is journaled and axially slidably guided at its forward end at I9 within a bracket'20 securedto the forward end of the guide shell while the rear end of this feed screw issupported in a manner to be later described Within the casing I1, and this feed screw threadedly engages at 2| a non-rotatable feed nut 22 Acarried by the hammer motor cylinder. This feed nut is in the form of an internally threaded sleeve non-rotatably arranged in a bore 23 formed in a depending boss 24 integral with the motor cylinder. As shownV in Fig. 2, the feed screw I8 is provided with an elongated rearward projection 25 having its rearward extremity extending within a bore 26 formed in the casing I1 and housing suitable spring mounting means for the yfeed screw. This spring mounting means comprises spaced thrust collars 21, 28, the former engaging the inner face` of a nut 29 threaded on the rearward extremity of the screw projection 25, and the latter abutting a shoulder 30 formed on a sleeve 3| supported on and surrounding the screw projection 25 and supporting the thrust washers `21 and 28. Interposed between these thrust Washers is a disc-like plate 32, and the adjacent faces of the thrust washers and plate are formed with annular raceways for the reception of ball thrust bearings 33 so that thrust of the feed screw may be taken in either of opposite directions during its rotation. Engaging the opposite faces of the plate 32 and reacting respectively against the shoulder 34 and a follower plate 35 are coiled springs 36 and 31. Engaging the outer face of the follower plate 35 and threadedly engaged at 38 within the rear casing head 39 is an adjusting screw 48 for varying the tension of the coiled springs 36 and 31 for a purpose to be later described. Fixed to the feed screw I8 and surrounding the rearward projection 25 of the latter is a pair of sleeve-like members 4l and 42. arranged in end abutting relation and are held against endwise movement with respect to the screw by engagement of the forward face'of the member 42 with a collar 43 formed on the feed screw and by engagement of the rear face of the member 4I with the sleeve 3 I, and against angular movement with respect thereto by usual keys. It will thus be seen that the members 4I and 42 are fixed with respect to the feed vscrew as regards both angular and longitudinal movements. Formed externally on the members 4I and 42 are oppositely inclined spiral grooves on screw threads 44, and these grooves or threads are engaged by spiral vanes 45 formed internally within a pair of rotatable ratchet sleeves or wheels 46 and 41 respectively. These members are in the form of nuts engaging the threads 44, and ,are arranged within a chamber 48 formed within the casing l1 and this chamber is closed at its forward end by a detachable head 49, while separating the rear end of this chamber and the bore 26 is a partition 5l) having an axial opening through which the rearward screw projection 25 extends and which receives the rearward portion of the member 4|.

As shown in Fig. 3, the ratchet member 46 is provided with external ratchet teeth 52 with which sets of oppositely disposed reversing pawls 53 and 54 are engageable, these pawls being carried by a pawl carrier ring 55 fixed within the chamber 48 by a key 56. The pawls are provided with spring pressed plungers 51 for yieldingly urging the pawls into their ratchet tooth engaging position. The ratchet member 41 as shown in Fig. 4 is provided with ratchet teeth 58 with which sets of oppositely disposed spring pressed reversing pawls 59 and 6I) are selectively engageable, the pawls being carried by a pawl carrier ring 6l fixed within a chamber 48 by a key E2. It will thus be seen that a reversible ratchet and pawl mechanism is provided for each of the sleeves 46, 41 so that the direction of rotation of these sleeves may be controlled as desired. The means for throwing the different sets of pawls into engagement with the ratchet teeth comprises an operating ring 63 rotatably mounted in the chamber 48 between the pawl carrier rings 55 and 6I as shown in Fig. 2. The means for oscillating this ring 63 about the axes of the members 4I and 42 comprises, as shown in' Figs. 2, 5 and '7, a cam member 64 formedon an operating shaft 65 mounted in the casing I1 and having an operating handle 56. When the cam is swung from its central position into the position shown in Fig. 7, the ring 63 is turned in one direction, but when the cam is swung into its opposite position, as indicated in dotted lines in Fig, '7, the ring 63 is turned in the opposite direction. Formed in the ring 63 are recesses 68, 68 within which project sets of lugs 69, 10 vformed on the sets of pawls 53, 54 and 59, 60. When the ring 63 is in the position shown in Fig. 5,

The members 4I and 42 are the ends of the recesses 68, 68 engage the lugs on certain of the pawls, while the lugs on the others of the pawls are released so that one set of pawls engages the ratchet teeth while the other set is held out of engagement therewith. It will thus be evident that the operating ring 63 constitutes means for selectively rendering the different sets of pawls active, thereby to permit rotation of the members 46 and 41 in either of opposite directions depending on which of the pawls of the sets are active.

- The mode of operation of the improved automatic feeding means is as follows: Let it be assumed that the hammer motor is running tc actuate percussively the drill steel and it is desired to effect forward feed of the hammer motor with respect to the guide shell. Reciprocation `of lthe hammer piston within its cylinder causes,

due t0 its sudden reversal of direction of movement, a longitudinal vibratory or recoil action to be transmitted by the hammer motor through the cylinder and feed nut to the feed screw I8, this vibratory action causing a slight longitudinal or endwise movement of the feed screw due to its spring mounting 32, 36, 31 on the guide shell. Since the spirallyv grooved members 4I and 42 are rigidly fixed to the feed screw they move longitudinally therewith, and as a result the spiral grooves thereon` engage the spiral vanes on the ratchet wheels 46 and 41 to effect, due to an opposite vinclination of the grooves, simultaneous rotation of the ratchet wheels 46, 41 in opposite directions. To effect forward feed, the operator grasps the lever 66 and swings the cam 64 to rotate'the operating ring 63 into the position shown in Figs. 5 and 6,` thereby moving the sets of pawls 54 and 60 out of engagement with the teeth of their respective ratchet wheels, while permitting movement of the sets of pawls 53 and 59 into engagement with the teeth of their respective ratchet wheels. Longitudinal movement of the feed screwv in the rearward direction causes the ratchet wheel 41 to rotate while the set of pawls 53 hold the ratchet Wheel 46 against rotation, and as a result rotative movement in a forward feeding direction is imparted, through the spiral vane and groove connection between the elements 46and 4l, to the feed screw I8. Uponlongitudinal movement of the feed screw in the forward direction the ratchet wheel 46 freely rotates,while the set of pawls 59 hold the ratchet Wheel 41 against rotation, and as a result rotative movement in a forward feeding direction is imparted, through the spiral vane and groove connection between the elements 41 and 42, to the feed screw I8. When it is desired to effect reverse feed of the hammer motor along the shell guideways, the operator turns the lever 66 to move the operating ring 63 into its opposite position, thereby moving the sets of pawls 53 and 59 out of engagementl with the teeth of their respective ratchet wheels while the sets of pawls 54 and 60 are permitted to move into engagement with the teeth of their respective ratchet wheels. As the feed screw moves longitudinally in opposite directions by the vibratory recoil action of the drilling motor, rotation of the feed screw I3 is effected in a reverse feed direction through the spiral vane and groove connections between the ratchet wheels and the members 4I and 42. The amount of longitudinal movement of the feed screw in its spring mounting relative to the casing I1 may be varied at will by adjusting the screw 40 to Vary the tension of` the mounting 'springs 3B, .31 jaridasa resultythe rateof Afeedin either direction may be varied at"will*`regardless of the intensity ofthe vibratory action set up within `the hammer motor. I

As a result of this invention it will be noted that an improved automatic feeding means is provided for the hammer rock drill wherebythe vibratory recoil action set up within thevhammer motor by the sudden reversal of the Adirection of movement of the hammer piston operatesto effect feeding of the hammer motorgtheopposite forward and backward recoil movements of the hammer motor operating to effect feed of the hammer motor in one direction. It will further be noted that by the provision of the spring mounting for the feed screw it is possible to vary the intensity of the vibratory action transmitted to the feeding means by the drill hammer motor, thereby to vary the rate of feed. Other uses and advantages of the improved Vautomatic feeding means will be clearly apparent to those skilled in the art. y

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 bemodified and embodied in'various other forms without departing from its spirit or the'sco-pe ofthe appended claims.

What I claim `as new and desire to secure by Letters Patent is:

1. In a rock drill, the combination with a hammer motor within which longitudinal vibrations occur during operation thereof and a guide along which said .hammer motor is guided, of automatic feeding means for feeding :said hammer motor along said guide including relatively rotatable co-acting feed screw and nut feeding elements, said feed nut element fixed against rotation relative to said feed screw element and the rotatable feed screw element mounted Vfor axial reciprocation, and means operated by the reciprocatory movement of said rotatable feed screw element caused by the vibratory action of the hammer motor for effecting rotation thereof relative to said non-rotatable nut element and including elements fixed tosaid feed screw element and having spiral grooves of opposite inclina-- tion, a ratchet and pawl device cooperating with each of said grooved elements and eachincludinga member having spiral lugs engaging the spiral grooves, axial reciprccation of the feed screw 'element in opposite directions effecting rotationof an element of each ratchet and' pawl 'device due to the engagement of the spiral lugs withthe spiral grooves.

2. In ay rock drill, the combination with a hammer motor within which longitudinal vibrations occur during operation thereof and a guide along which said hammer motor is guided, of automatic feeding means for feeding vsaid hammer motor selectively in opposite directions along said'guide including relatively rotatable co-acting feed screw and nut feeding elements, said feed'nutr element fixed against rotation relative to said feed screw element and the rotatable feed screw element mounted for axial reciprocation, andmeans operated by the reciprocatory `movement of said rotatable feed screw element caused by the vibratory action of the hammer motor for effecting rotation thereof relative to saidlnon-rotatable nut element and including elements fixed to said feed screw element and having spiral grooves of opposite inclination, a ratchet and `pawl device cooperating with each of said lgrooved elements-"farrdfxeach `including a member having spiral lugs Iengaging the: spiral vg'1.fooves axial reciprocation of the feed screw element-indpposite directions effecting rotation of an element of each ratchet and pawl device due to the engagement of the spiral lugs with the spiral grooves, said ratchet and pawl devices being reversible and embodying reversible pawls whereby rotation of said elements of said ratchetdevices may be controlled to effect 'rotation o'f said feed screw element in either of opposite directions.

3. Ina rock drill, the .combination with a ham- `mer motor within which opposite longitudinal vibrations occur during operation thereof and a guide along which said hammer motor is'guided, of automatic feeding means actuated by the opposite longitudinal vibrations of the hammer motor for feeding said hammer motor along said guide including relatively rotatable co-acting feed screw and nut 'feedingelementa said nut feeding element fixed against rotation relative to said feed screw element and the rotatable feed screw element mounted for axial reciprocation, and a yieldable spring mounting for said feed Iscrew' element including a member fixed for movement longitudinally therewith and opposed springs actingv on said member.

4. In a rock drill, the combination with a hammer motor within which longitudinal vibrations occur during operation thereof and a guide along which said hammer motor is guided, of automatic feeding means for'feeding said hammer motor along'said guide including relatively rotatable co-acting feed screw and nut feeding elements, said nut feeding element fixed against rotation relative to said feed screw element and the rotatable feed screw element mounted for axial reciprocation, a yieldable spring mounting for said feed screw element including a collar fixed for movement longitudinally therewith and opposed springs acting on said collar, and means for varying the tension of said springs to vary the range of longitudinal reciprocation of said feed screw element.

Y5.*In a rock drill, the combination withv a hammer `motor within which longitudinal vibrations occur during operation thereof and a guide along which said hammer motoris guided, of automatic feeding means for feeding saidfhammer mot-or selectively in opposite directions along saidy guide including relatively rotatable co-acting feed screw and nut feeding elements, said nut element fixed against rotation relative to said screw element and the rotatable screw element mounted for axial reciprocation, a pair of ratchet and pawl devices, means fixed to said feed screw element for axial reciprocation therewith for exerting forces'tending to effect rotation of corresponding elements of said ratchet and pawl devices respectively in opposite directions, one ratchet and pawl device acting to hold said feed screw element against rotation in one direction during axial movement of the screw element in one direction and the other ratchet and-pawl device actingto hold said screw element aga-inst rotation in the same one direction during axial movement of the screw element in the opposite direction.

6. In a rock drill, the combination with a ham mer motor within which'longitudinal vibrations in yopposite directions occur during operation thereof, of automatic feeding means for the hammer motor including relatively rotatable threaded feeding elements, one carried by the hammer motor and the other element rotatable relative thereto, the lead of the threads of said elements being such that substantially no effective rotative tendency is imparted to the rotatable element directly by the longitudinal thrusts f the element carried by the hammer motor, and means operatively connected to said rotatable feeding element and operated directly by both of the opposite longitudinal Vibrations of the hammer motor for automatically positively effecting relative rotation between said threaded elements ina direction to effect feed of the hammer motor in a forward direction toward the work.

7. In a feeding device for a rock drill, a power actuated reciprocable toothed member, a feeding element capable of feeding motion in either direction, a movement transforming mechanism associated with said member and element including means responsive to each stroke of said member for imparting feeding motion to said element, and means forselectively controlling the direction of feeding motion of said element.

8. In a drilling apparatus, the combination with a support, of a drilling motor slidable on the support having reciprocatory motion imparted thereto, of a feeding mechanism for the motor including a reciprocable and rotatable element, a self locking screw connection between said motor and element whereby the reciprocation of the motor is transmitted to the element and the rotation of the element in either direction causes the forward or backward feeding motion of said motor, and means associated with said element operable by virtue of the reciprocatory motion thereof for effecting its rotary motion in either direction.

9. In a drilling apparatus, the combination with a support, of a drilling motor slidable on the support having longitudinal forward and backward movement imparted thereto, of a feeding mechanism for the motor including a screw carried by the support in self locking threaded engagement with the motor for longitudinal movement therewith and capable of rotation for imparting feeding motion to the motor, means depending upon the longitudinal movement of said screw for effecting its rotary motion, and means associated with said screw having energy stored therein during the rearward movement of the screw, said energy being automatically released during the forward movement of the screw for imparting rotation thereto additional to that normally resulting from its forward movement.

10. In a drilling apparatus, the combination with a support, of a drilling motor slidable on the support having reciprocatory motion imparted thereto relative to the support, of a feeding mechanism for said motor including a rotatable element carried by the support and reciprocable longitudinally thereof, reciprocation transmitting means between said motor and said element including a self locking screw connection whereby the rotation of said element in either direction causes the forward or backward feeding motion of the motor, and means deriving motion from the reciprocation of said element for effecting Vits rotation in either direction.

able in either directionv relatively to the other for effecting the forward or backward feeding movement of the motor, and means. associated with said rotatable element and responsive to the reciprocatory motion thereof for effecting its rotation in either direction.

12. In a drilling apparatus, the combination with a support, of a drilling motor slidable relatively to the support and having reciprocatory motion imparted thereto, of a feeding mechanism for the motor including a screw carried by the support in self locking threaded engagement with the motor for reciprocation therewith and capable of rotation for imparting feeding motion to the motor, means actuated by virtue of the reciprocatory motion of said screw for effecting its rotary motion in either direction, and means for selectively controlling the direction of feeding motion of themotor.

13. In a drilling apparatus, the combination with a support, of a drilling motor'on the support having forward and backward motions alternatively imparted thereto, of a feeding mechanism for Lthe motor including a screw carried by the support in self locking threaded engagement with the `motor for forward and backward movements therewith and capable of rotation for imparting feeding motion to the motor, means depending upon the forward or backward motion of said screw for automatically effecting its rotation, and means associated with said screw for selectively controlling the rate of speed of said feeding motion.

14. In a drilling apparatus, the combination with a support, of a drilling motor slidable on the support and having a reciprocatory motion imparted thereto, of a feeding mechanism for the motor including a reciprocable element carried by the support, reciprocatory movement transmitting means between said motor and said element including a self locking screw connection, said element being capable of feeding movement in one or the other direction for effecting a forward or backward longitudinal movement of the motor additional to that of its reciprocatory motion, a helical spline and ratchet mechanism actuated by virtue of the reciprocatory motion of said element for automatically effecting its feeding movement in one or the other direction, and means for controlling the direction'of feeding movement of said element.

15. In a drilling apparatus, the combination with a support, of a drilling motor on the support having jars imparted thereto to move the motor back and forth longitudinally of the support, of a feeding mechanism for the motor including a nut carried by the motor, a screw carried by the support in self locking threaded engagement with said nut for longitudinal movement therewith and capable of rotation in one or the other direction for effecting a forward or backward longitudinal movement of the motor additional to that resulting from said jars, means associated with said screw responsive 1 to the longitudinal movement thereof for effecting its rotation in either direction, and means for controlling the direction of rotation of said screw.

16. In a drilling apparatus the combination with a support, of a drilling motor slidable on the support having reciprocatory motion imparted thereto, of a feeding mechanism for the motor including a nut carried by the motor, a screw carried by the support formed with a relatively small pitch thread engaging said nut for transmitting kthe reciprocatory motion of the i 212 InA a`r rock drill, the combination with a motor to said screw and ,preventingftlre .rotation of the screw upon axial pressure exertedthereon by said nut, said screw being capable of rotation for effecting the `feeding movement of 'the 'milton and a helical spline and ratchet Vme'clrarzti'sm associated with said screwfoperable by virtue of its reciprocation .for effecting its rotation.

17. In a drilling apparatus the,v combination with a support, of a drilling motor slidabl'e on the support having reciproc'atory motion imparted thereto, of a feeding mechanism'A for the motor including a feed element carried by said support capable of feeding motion, a connection between said motor and element including self. locking screw threads for transmitting 'the -reciprocation of the motor to the element, the feeding motion of said element causing-through said connection the feeding motion of said motor, and a helical spline and ratchetmechanism associated with said element operable by Virtue of its reciprocation for effecting-its feeding yrho-v tion.

18. In a drilling apparatus, the combination with a support, of a drilling motor vslidable. on the support havingv a reciprocatoryr motion imparted thereto, of a feeding mechanism for the motor including a feed member carried by the support, a connection between saidw motor and member including self locking screw threads `for constantly transmitting the reciprocatory motion of the former to the latter, said member being capable of feeding movement for `'transmitting feeding motion to said motor through said connection, helical spline and ratchet means actuated by virtue of the reciprocatory 'motion of said member for effecting its feeding 'move-v, ment, andy spring means associated with said member having energy stored therein -dufringfthe strokes of the member in one direction, saidV energy being automatically released during rthe strokes of the feed member in the otherdirection for imparting a feeding power thereto addi--` tional to that normally resulting from itsja'rs,

19. In a drilling apparatus, the combination with a support anda drilling motor 'slidable relatively to the support and having' recip'ro`` catory motion imparted thereto, of a feed-ing mechanism for the motor including a 'screw carried by the support in self lockingthreaded engagement with the motor for reciprocation therewith and capableV of rotation for imparting feeding motion to the motor, and means for'v effecting rotation of said screw selectively` Vin opposite directions including a llelically"tootlfl'edY member connected tor said screw for reciprocation with the latter, 4a cooperating helicallyvtoothed member, and means for precluding rotation of said second mentioned'membe'r iii-one direction or the other at will While permitting rotation thereof in the direction opposite that in which rotation is precluded. n 'y y 20. In a rock drill, the combination 'with av hammer motor having a piston andv subjected toA longitudinal jars in opposite directie.ns-by,l said' piston, of automatic feeding means for the hain-4 nier motor includingy a feed screw mountedfor' sur hammer motor in-which longitudinal Vibrations in' opposite directions occur during operation thereof, of automatic feeding means for the hammer motor including means actuated by the longitudinal vibrations of the hammer motor for automatically effecting feed of the hammer motor-in a forward direction', said automatic feeding means including a feed screw mounted for axial reciprocation, and means movable with the hammer motor for causing longitudinal movements of-the feed screw in opposite directions to attend the lopposite longitudinal vibrations of the hammer motor, and means whereby the lon- 'gitud-inal movement of the feed screw Ain one 'direction directly effects positive feed of the hammer motor in a forward direction while such longitudinal movement is taking place and whereby the longitudinal movement of the feed screw in the opposite direction also directly effects positive feed of the hammer motor in the forward direction while the last mentioned movement of said feed screw is taking place.

22. In a rock drill, the combination with a guide shell including a feed screw reciprocablyy mounted on said shell and a feed nut supported by said rock drill and means actuated by the thrust ofthe nut on the screw in a rearward direction for rotating said feed screw, while the same is moving rearwardly relative to said shell, in a direction to cause relative advance of the feed nut therealong.

*24. Inl a' rock drill, the combination with a hammer-fnotor within which longitudinal vibrations in opposite directions occur upon operation thereof, of automatic feeding means for the ham-` mer motor including a feed nut and a feed screw andrne'ans actuated directly by the opposite 1ongit'udinal vibrations of the hammer motor for automatically effecting positive rotation of the axial movement, a feed nut 'carried'by said-*11am` mer motor and transmitting to said 'screw' oppon-y site longitudinal thrusts as said'pisto'n imparts opposite jars to said hammer motor, andfmeafns0 actuated by the rearward thrusts of the feed v screw to rotate the same, during such rearward thrusts, relative to the feed 'nut ina :direction to advance the Vnut relative to 'theScrew-lnav feeding direction.

kvor

feedA screw relative to the feed nut in a forward-feed-effecting direction during each of the opposite longitudinal vvibrations of the hammer motor. l l

25;` In va rock drill, the combination with -a hammer'motor within whichv opposite longitudinal'vibrations occur during operation thereof and a guide along which said hammer motor is guided, ofi; automatic feeding means actuated by .the opposite longitudinal vibrations of the hammer motor for feeding said hammer motor along said guide including relatively rotatable co-acting feed said feed screw element and the rotatable feed screw elementmounted for axial reciprocation,

a yieldable spring mounting for said feed screw element includingv means for yieldingly holding the same, when said motor is idle, in a position from which it is movable in either direction and' to'which said yielding holding means tends to return it irrespective of the direction in which it is longitudinally displaced, and means operatedl by the longitudinal movements of said feed screw element for rotating the same.

26. In a rock drill, the combination with a hammer motor within which longitudinal vibrations in opposite directions occur during operation thereof, of automatic feeding means for the hammer motor including relatively rotatable threaded feeding elements of which one is held against rotation, one of said feeding elements being connected to the hammer motor so that it and said hammer motor undergo longitudinal movements together, the lead of the threads of said elements being such that substantially no effective rotative tendency is imparted to the rotatable element directly by the longitudinal thrusts of the element carried by the hammer motor, and means operatively connected to said rotatable feeding element and operated directly by both of the opposite longitudinal vibrations of the hammer motor for automatically positively effecting relative rotation between said threaded elements in a direction to effect feed of the hammer motor in a forward direction toward the work.

27. In a rock drill, the combination with a hammer motor within which longitudinal vibrations in opposite directions occur during operation thereof, of automatic feeding means for the hammer motor including relatively rotatable threaded feeding elements of which one is held against rotation, one of said feeding elements being connected to the hammer motor so that it and said hammer motor undergo longitudinal movements together, and means operatively connected to said rotatable feeding element and operated directly by both of the opposite longitudinal vibrations of the hammer motor for automatically positively effecting relative rotation between said threaded elements independently of any wedging action directly exerted by the non-rotatable element on the other element, in a direction to effect feed of the hammer motor in a forward direction toward the work.

28. A rock drilling device comprising a fixed support having longitudinally extendingguideways, a drill mounted thereon and adapted to reciprocate in said guideways, said drill having a reciprocating hammer piston therein adapted to impart to the drill longitudinal vibrations in opposite directions, a longitudinally extending feed member for said drill, means for coupling the feed member to the drill to adapt the feed member to vibrate in unison with the drill, said feed member being supported on said support by means permitting limited longitudinal movement of the feed member relative to the support, and means carried by the support and responsive to longitudinal vibrations of the feed member in both directions for moving said feed member in a direction to advance the drill. f

29. In feeding means for percussive tools, in combination, a shell, a drill casing slidably mounted in said shell, a rotatable feed screw mounted on said shell and passing through a feed nut carried by the drill casing, said drill casing being subject to vibrations lengthwise of said screw, the means mounting the screw on the shell being yieldable to permit limited lengthwise movement of the screw in response to said vibrations, and means responsive to axial movement of the screw with respect to the shell for rotating said screw in the same direction upon each of a pair of consecutive opposite longitudinal movements thereof.

30."In combination, a drilling machine subject to longitudinal vibrations in". both directions, a support havingvfmeans including guideways for Asupporting said 'machine land permitting longie tudinal movement of the latter, a longitudinally extending feed screw having connections with both .the machine and the support, said connections comprising a nut carried by the drilling machine and receiving the screw, the lead angle of the screw and nut being such that axial movement of the nut relative to the screw through wedging action of thenut on the screw is substantially precluded, ratchet mechanism `carried bythe support for preventing rotation of the feed screw in the rearward feeding direction, the connection between the screw and support being yieldable to permit longitudinal movement of the feed screw together with the nut in a rearward direction, and means responsive to such longitudinal rearwardv movement for rotating the screw in the forwardfeeding direction.

31. In combination, a drilling machine subject to longitudinal Vvibrations inboth directions, a. support having means including guideways for supporting fsaidmachine and permitting longitudinal movement of the latter, a longitudinally extending feed screw having connections with both the machine and the support, said connections comprising a nut carried by the drilling machine and receiving'the screw, the lead angle of the screw and nut being such that axial movement of the nut relative to the screw through wedging action of the nut on the screw is substantially precluded, ratchet mechanism carried by the support for preventing rotation of the feed screw in the rearward feeding direction, the connection between vthe screw and support being yieldable to permit longitudinal movement of the feed screw together with the nut in a rearward direction, and means` responsive to such longitudinal rearward movement and also to a succeeding forward movement for rotating the screw in the forward feeding direction.

i 32. A drilling mechanism comprising a support having longitudinal -guideways, a percussive drill movably supported in saidguideways, an elongated member connected .to said drill, means mounting saidmember kfor limited longitudinal movement on the support, an element having threaded connectionA with the member and held against longitudinal movement on the support, ratchet .mechanism preventing rotation of the element in one direction only, another element having "an oppositely threaded connection with said member and held against longitudinal movement on the support, and ratchet mechanism preventing rotation of the said last mentioned element in vone direction only, whereby reciprocation of thewmember with respect to said elements imparts step-by-step rotary movement to the member during each unidirectional pass of its reciprocatory movement.

Vv33.A, rock ldrilling device comprising a support, a percussive drill slidably mounted thereon,

a vfeed screw extendingvparallel to the direction of movement of the drill, said screw having three sets of'threads thereon, one set being received within a nut carried bythe drill and the other two sets within nuts carried by the support, said last mentioned sets of threads of opposite hand and both ofsaid last mentioned sets of threads having alarge leajd angle whereby longitudinal movement of the screw with respect'to the supporti'ineither vdirection causes -rotation of the screw, and yieldable means forresisting Vlongitudnal movement of the screw with respect to the support.

34. A rock drilling device comprising a support, a percussive drill slidably mounted thereon, a feed screw extending parallel to the direction of movement of the drill, said screw having longitudinally spaced sets of threads, one set being received within a nut carried by the drill and the other within a nut carried by the support, said threads being of the same hand but of different leads, yieldable means for resisting longitudinal movement of the screw with respect to the support, and means associated with the second set of threads for controlling the direction of rotation of said screw.

35. A rock drilling device comprising a guide shell having longitudinal guideways, a rock drill movably mounted in said guideways and subject to longitudinal jars imparted by a piston, and a plurality of feed mechanisms supported by said guide shell, one of said feed mechanisms being actuated by forward jars transmitted to it from the rock drill for feeding the drill forwardly and the other feed mechanism being actuated by rearward jars transmitted to it from the drill for @feeding the drill forwardly, and said two feed mechanisms being adapted to feed the drill like distances responsive to jars of like intensity.

36. A rock drilling device comprising a shell having guideways, a rock drill movably mounted in said guideways and having a piston reciprocable in a cylinder and adapted to impart a jar to the rear end of the cylinder on one stroke and on its other stroke to strike either the front end of the cylinder or a drill steel, depending upon the position of the steel and the drill, a feed mechanism carried bythe shell and adapted to.

receive forwardly directed jars from the drill to feed the drill forward, and another feed mechanism for feeding the drill forward, said last mentioned feed mechanism operating independently of said forwardly directed jars and both of said feed mechanisms operating during the feeding of the drill up to the work.

37. A rock drill device comprising a fixed support, a drill mounted thereon for relative movement in a forward and in a rearward direction, said drill having a cylinder with a piston therein, said cylinder being subjected to successive jars in a rearward direction upon reversal of the direction of the piston, a feed nut carried by the drill and receiving a longitudinally extending feed screw carried by the support, and mechanism for operating the feed screw to move the drill step by step forwardly, said mechanism comprising means responsive to jarring movement of the cylinder rearwardly relative to the support for causing the feed screw to rotate to move the drill a step forwardly relative to the screw while the rearward, jar-eected movement of the cylinder relative to the support is taking place.

38. In a rock drill, the combination with a hammer motor within which longitudinal vibrations occur during operation thereof and a guide along which the hammer motor is guided, of automatic feeding means for feeding said hammer motor along said guide including relatively rotatable coacting threaded feeding elements, one feeding element fixed against rotation and the other, rotatable, feeding element mounted for longitudinal movement, and means operated by each longitudinal movement of said rotatable feeding element caused by the vibratory action of the hammer motor for effecting rotation thereof relative to said non-rotatable feeding element in a feed-effecting direction.

FRANK E. SINCLAIR.

CERTIFICATE OF CORRECTION.

Patent No. 2,271,026. January 27, 19LL2.

FRANK E. SINCLAIR.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, first column, line 25, for the word "on" read -or.; and that the said Letters Patent should be read. With this correction therein that the same may conform to the record of the case in vthe Patent Office.

signed and sealed this 21st day of April, A. D. 19u2.

Henry Van Arsc'lale,

(Seal) Acting Commissioner of Patents.

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