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Publication numberUS2089202 A
Publication typeGrant
Publication dateAug 10, 1937
Filing dateMay 11, 1935
Priority dateMay 11, 1935
Publication numberUS 2089202 A, US 2089202A, US-A-2089202, US2089202 A, US2089202A
InventorsGartin Elmer G
Original AssigneeSullivan Machinery Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rock drill feeding means
US 2089202 A
Abstract  available in
Images(3)
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Claims  available in
Description  (OCR text may contain errors)

Aug. 1o, 1937. E Q GARTIN 2,089,202

i Rovcx DRILL FEEDING MEANS i 3 `Sheets-Shee'l'. l

Filed May l1, 1955 n "HAMM Ik Z f uw m@ m N @w W 4.# $4 f .III WMM w u@ .mw ww NN m QN QQ hw www w mm ww Q No@ w @e ww @6% m 1 my I--- 1 lill-- Huhn.. -.hlhnlhunuunnuhwuhwnF.unuuuuHLHHHJ a Q IJ U lr um VL,

k. w w n JU Aug. 10, 1937. E. G. GARTIN ROCK DRILL FEED-ING MEANS 5 sheets-sheet 2 Filed May ll, 1955 SS n@ l A TTORNE Y .A/ i, n W N.

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Aug. -10, 1937. E. GARTlN 2,089,202

ROCK DRILL FEEDING MEANS Filed May 11, 1955 s sheets-sheet s Patented Aug. 10, 19.37

' STA-r es noci( DRILL FEDING MEANS Elmer G. Gartin, Claremonhfl; assigner to Sullivan Machinery Company', a corporation of f Massachusetts y ivApplijcationMay 11-, 1935, Serialy 21,026,

'2c claims. (el, 1:21.44),

'I'his-invention r'elatest'o :rock drill feeding means, land f more particularly" hasv reference Ito improvements inv a pressure; fluid actuated `lfeed.- ing I means for aV hammer vrock drill 'of fthe Ymountfed drifterftype;l

v An-object' of -thisinventionhis to provide an improved-rock, drillyfeeding means. Another object i'sto'provide anl improved pressure fluid actuated feeding means for a. rockdrill of the Amounteddrifter type hav-ing embodied .therein 'animproved' direct acting: feeding device having a minimum; A"overa-l1 length lconsistent with the total Iengtlr'o feed.; Stillanother-object'of this 'invention' is to provide an improved pressurey iluid actuated feedingfmeans'forfa rock drill wherein the overall dimens-ion "of the feeding device remains constant throughout the-'travelffo'r `feed of therockdrill.' yYet another object of'vth'is in- 'vention `is to provide' a'n improved Apressure-fluid actuatedl'feedin'g'means having embodied therein improved means 'for maintaining the vactive feed- "ing parts locked-,against movement Wheneverzthe feed is renderedxinactive. These andother I'ob'- jectsIv will, however," subsequently'more full appear.. l.

In the accompanying'drawingsthere-are shown forfpurlposes ofillustrati'on onefor'm'and `a modlfica-tion which fthe inventionimayiassume in practicei In theseid'rawings, t i

Figi-1 isa view 'in longitudinal section.- of an illustrative v'embodirnent ofthe improved feeding meansandiUs associated rock drill. f

Fig.2is a ll'iorizon--tal sectionaliview taken su stantially'on'l line21-`2Fof Figsfl' and A5;

Fig.'3 is' ai piani view vof thev improved feeding means with 'the rock drill removedftherefrom.

Fig; 4' is a cross'sectional View taken substantially on line 4"-4 of Fig. l; with' internal'motor parts'omitted*A l I Fig-l' 5-is a cross sectional view taken v'substantiallyon yline 5 5 of Fig'."1, with interna-1 motor parts omitted. f Fig. 6 is a viewsirnilar to'Fig. 4 showing a modied form of cylinder and piston'structure.

Fig; 7 is across sectional viewftaken substantially on line 1-7-1 of Figi 1'.

Fig. 8 is' a detail 4sectional view taken on line .s -s of'rig. 7.

Fig. 9 is a detail sectional view taken on line Q- S-cfFig?.

VFig; v10 is a detail sectional view .takenv on line I-Il--III of Fig; 7with-the feed control' valve in ardiiferentfpositionff 4 .Fig,. 11visa detail sectional view villustrating the automatic control valve.

In this illustrative'embodimentof the inventionthere 'is shown ardrifter type hammer rock drillgenerally designated I; conventionalin form, and' comprising a cylinder 2 having a piston chamberv 3 containing a reciprocable Vhammer pistonv for delivering impact blows to the shank of adrillsteel 4; The -motor cylinder 2V has a vrear head 5 anda front chuck housing yIi, the f1.0

latter suitably supporting the chuck-for the 'drill steel 4'and-,the-elements 2, 5, and 6 maintained iii-assembled relation by ksuitable side rods 1. -As is `usual in rock drills'of the mountedv drifter type,y themotor cylinder 2-has formed on its bottom-surface parallel'guides 8;,8-slidably mounted 'in longitudinal guideways 9, 9 formed onthe upper vsurface --of thefeed cylinder I0 of the improved AfeedingdeVice generally ydesignated I'I. The guidewaysy 9 are formed by upper plates I2 4'and a-nl intermediate plate- I3 havingf a longitudinal vguiding groove I4 forming the guideways, the plates-I2 and I3 being secured in assembled relation with respect to side flanges integral with .the feedcylinder I0 by means of bolts I5. The 5platef-I3 lhas la plane bottom surfacev I6 and has -symmetricallywith its axis a=closedslot I'I extending' substantially its full length. Through this slotA al depending driving Aprojection herein :inV the-form of a stanchion I8. formedk integral (30 With, lthe 'lower portion of the chuck housing 6 4;extends.into'engagement Withva feed piston I9,

jthe latter herein of rectangular cross section, re-

ciprocable in a 'correspondingly shaped bore 20 nal slot `Il is maintained sealed irrespective `of the, positionof the -feedpiston with respect to the: feed cylinder by meansof an inner endlesssealing-strip 2| herein in the form of a flat metallic -ribbon preferably composed `of spring steel, guided-between thel bottom surface I6 of the plate rI3 andledge-like shoulders 22 formed lon the-feed'cylinderflll. vThe stanchion I8 extends through an opening 23 formedin this sealing strip for securing-the strip to thel feed -piston and this strip lat the loppositeendsof the feed cylinder is guided within* arcuate recesses 24 formed in end heads 25 of the feed cylinder II). This flexible strip passesaround the curved inner` surfaces ofthe recesses 24 and the bottom longitudinalportion thereof extends longitudinally of the feed cylinder in parallel relation with its intermediate upper portion through a ylongitudinal slot 1liV formed in the bottom surface Aof the feed cylinder I0. The stanchion.- I8 also passes through an opening 2'I formed in an outer endless dust strip 28 similar to the strip 2| but of substantially less width, as shown in Fig. 4. 'Ihis dust strip is guided on the outer plane surface I4 of the plate I3 and the cylinder heads 25 are formed with arcuate recesses 29 in which this strip at the ends of the feed cylinder is guided, the bottom longitudinal portion of the-dust strip underlying the bottom portion of the sealing strip 2| and likewise guided at the bottom of the feed cylinder. The bottom plane surface of the plate I3 has formed therein series of packing, lubricating and balancing grooves 3l) running parallel with the closed slot Il, these grooves beingindividually made discontinuous vfor a purpose `to be l.

later explained. Secured between the heads 25 and the ends of the feed cylinder are plates 3| having secured thereto as by screws suitable cup packings 32, while secured to the opposite faces.

of the feed piston by screws 33 are similarrcup packings 34. 'Ihe'packingfs32 sealingly engage the inner walls of the -feedv cylinder bore and the inner surface of theinner sealingstrip 2| to prevent leakage of pressure fluid from the ends of the feed cylinder bore past the end plates, while the packings 34 sealingly engage the walls of the cylinder bore and the inner surface of the sealing strip to prevent leakage of pressure fluid from the ends of the cylinder bore past the feed piston.-v Secured to the bottom surface of the feed cylinder I0 inY any suitable manner, as by welding, and enclosing the outer side of the slot 26, is a bottom plate 35 having formed integral with the bottoml portion `thereof l a :supporting trunnion36. The inner' sealing strip is slightly widerthan'the width'of cylinder bore, while the sides of vtheouter dust strip overlie the edges of thevslot -I'I so that these strips always maintain the "upper side ofthe feed piston and the upper side of the slot VI 'I continuously sealed irrespective ofthe position of-the feed piston within the feed cylinder bore, and the guiding means for the strips provide freedom for travel of the strips at either edge thereof, although guiding the same rmly. The curved recesses of the heads 25 are so formed as to constrain the strips to bend back upon themselves in an easy curve so that their ends lie between the base wall of the cylinder in the groove 26 and a cooperating bottom groove 3'I in'which the outer dust strip is guided. To provide for directness of drive between the stanchion I8 of the rock drill and the feedrpiston I9 both as totrue axiality vof piston thrust and in order to make allowances for slackness between the drill guide elements 8, |2 and I3, a piston pin 38 is'used as one element of the con- Vnecting mechanism between the rock drill and the feedpiston, this -pin being free to rotate transversely of the piston inthe bore 39 and in turn pierced transverselyat '40 to receive slidably Ithe stanchion I8. The combination of stanchion androtatable piston pin provides a desirable universality lo'ffactionA between the stanchion and the piston' guides. .In action'the reactance of the feeding pressure is Vdirectly againstthe feed piston and so to therockdrill, so the only stress in the sealing strip is that' imposed by its own friction when'subjected to pressure in the cylinder bore, crowding it against the plane surface I6 of the intermediate plate I3, plus a negligible load due to bridging of the slot II. Obviously, its

i friction load willvarydirectly with the length of kthe strip'exposed to' pressure wall. Such being thecase, it isg'necessary to entertain-a diminishing feeding effort or else avoid the loss'by bal-V ancing the pressure on the strip by the grooves 30. Were these grooves to be freely communicative from end to end of the guide plate I3, pressure reaching them due to leakage from the feed cylinder around the strip edges, would travel beyond the pressure area on one side of the piston to the zone of less pressure on the opposite, nonfeeding side of the piston andsovescape without lessening the friction creating pressure-between the plate I3 and the sliding sealing strip; hence the series of grooves 30 are formed discontinuous with a series of partitions or obstructions left betweenthe grooves which become effective to stop this longitudinal flow v.from one side of the feed .piston to the other, provided their length is less than the distancev between the opposite faces of the feed piston. The staunchness of such a construction against pressure fluid leakage is primarilyone of workmanship, since the interstice necessarily leftY between the edge of the strip and its'guideway can 'not be definitelyv packed. 5 'Ihe -usu'aldifficulty of packing a right-angled corner,

necessarily in this case without fillet, ofcourse is present, but'the moulding of packing has progressed to a point where these difficulties under modern conditions are vastly 'less than heretofore. The'operating necessity for some leakage from such a feed cylinder,v if even, forward urge is to be achieved, isa favorablecircumstance. The probability of slight leakage is therefore entertainable with equanimity. For the sealing of the strip against the guide base I3, excellent conditionsobtaimand the necessityfor a flexible strip in order to vmake the end turns, materially enhances the probability of securing staunchness to the slot through which ythe connection to the rock drill passes. f Y l f Suitable pressure rfluid passages "controlled by valve mechanism to be later described, are drilled in the rear head 5 and the motor cylinder'f'2,fand 40 these passages communicate with `parallel passages 43 and formed in thevstanchion I8,l and the latter passages'communicate tothe diverse faces 'of .the feed piston I9 through the medium of spring-pressed thimbles 45'sealed against op.-

posed faces of the stanchion and conduits 46 and 41, eventually issuing to the cylinder bore Ythrough drilled holes in the packing attachment screws 33.

Provision has also been made for retaining the rock drill in any position `with respect `to the guideways of the feeding device when pressure fluid is unavailable inthe feedcylinder. This mechanism comprises a shoe 50 bearing upon the returned sections of` the sealing and dust strips which it traps against the base wall ofthe feed 55 cylinder by influence of a stout spring 5I. The effort of thespring transmitted through a toggle 52 tothe shoe 5|1 aggregates a thrust normal -to the cylinder base Wall and so to the strips sufficient to provide friction capable of support .ing the weight ofthe rock drill in vertical position. The pressure of the spring 5I is neutralized when pressure fluid is available in the feed cylinder by the opposingpressure-within the lcylinder and piston .combination 53, sufficient inarea to live pressure between the feed cylinder'ends but f CII- the brake shoe when the piston 53' is moved toward the right in Fig. 1 by the coiled spring 5I, that is, when both ends 'of the feed cylinder are connected to exhaust. v"-Ihe'brake shoe and toggle are preferably slotted at vtheir pivotal connection with the cross pin 51` to permit'free bodily -movement of the brake shoe and pivotal movement of the toggle. The automatic valve meansV 54', as

l shown most clearly in Fig.11, comprises a doubleended valve 55 guided for reciprocation in a bore formedl in the cylinder base and normally vheld in its centered position by'oppositely acting coiled springs 56 and 55. The opposite yends of the valve bore are connected lthrough passages 51 and 51 With the opposite ends of the 'feed cylinder bore at the opposite sides of thefeed piston, so that when pressure uid is supplied through one passage to one end of the feed cylinder bore, pressure fluid is simultaneously supplied to one end of the .valve 55 to move the valve against the pressure of the opposing spring to cut off communication of the other end of the feed cylinder bore With said other passage. Also )communicating With the valve-bore are passages .58 and 58 connected by a passage 59 with the passage 54 leading to the bore Aof the cylinder containing the piston 53'; and these passages 58 and 58' are maintained in communication with the passages -51 and 51y When' the valve 55 is in its centered position .shownin Fig. l1. When the valve 55 ismoved toone vend or the other of -its bore by thepressurefluid in one of the passages 51, 51', pressure fluid is supplied through one of the passages 58, 58 to the passage 59, and thence to the'passage 54'to effect'release of the brake, While communication of 'the passages 58, 58 With the other of the passages 51, 51 iscut off by the valve. 'It will thus be yseen that Whenever pressure fluid is supplied to the feed cylinder, the brake is maintained released bythe pressure in the passage 54 acting on the brake piston; and when the yfeed `cylinder is connected to exhaust, the brake isautomatically applied by the coiled spring 5I.

In Fig. 6 is shown an alternate form of the cylinder and piston'structure.l Herein the guide- Ways Sfor receiving the guides 8 on 'the `rock drill are formed by upper plates 50, and an intermediate plate 6| ybolted to one side of a'feed cylinder 62 herein of cylindrical form, and a support of normal characterA is attached `midway of the cylinder length at 53. Reciprocable inthe circular bore 64 of kthis feed cylinder is a cylindrical feed piston 55 carrying annular packings instead of the packings of vrectangular 'shape shown in Fig. v 2. The stanchion for directly connecting the rock drill to the feed pistonis indicated at 56, the stanchion entering a similar piston-pin-arrangement with pressure fluid distribution in general as above described.` The piston, however, instead of being rectangular is circular, and circular packings maybe used both at the piston and at :the end heads. The cylinder vWall adjacent to and symmetrical with theY closed slot 6i, through which thestanchion 56 'reaches the piston, is breached to take .a vcurved sealing strip Z68, 'the concavity of Whichfis aniarc of the cylinder-size selected. End return `means isv made asin Fig. l except that the origin of the -return bend is further removed from lthe cylinder head plates in order to permit the change g5 'in form kfrom arcuate to fiat section on the part 'of the strip inseparable from return bending of 'such a form. Protection means for the inactive *portion of the strip lying beneath the cylinder is achieved' by built-up construction, and manu- 5:50

facture of the strip in this specic form Vis now Vavvell-knovvn and closely controlled art. A familiar example of such a strip and the Anature Vof a return bend made in it Vis furnished by the type of steel measure coiled interiorly of a cir-'15 cular container to be found in almost .every mechanically interested establishment. A marked detailed difference between the two designs, apart -from the circularity oi' the latter, is Worthy Aof note. In the case of the flat strip, it is neces- 520 `sary vto snare its edges between the guide base I3 and the cylinder body to avoid sagging on the non-feeding side. The strip in this case is positively guided and sagging can only result from bending transversely of the strip. In-the225 Case of the circular piston, however, the inherently stiff, arched form of the strip removes this fear, and it is consequently unnecessary to .provide snaring for the strip edges. 'Ihe arched strip is also practical in a narrower width "thaniiO the flat strip; on accountof this lack of necessity for support, edge friction' is consequently less. The packings, sealing and duststrips and the strip-receiving passages are the 'same as those above described, with the exception that they 35 are curved to accommodate a circular feed cylinder; Wherefore further illustration of details is? unnecessary. p f

Now referring to the valve mechanism and fluid distributing passagesV for supplying pressure 1:40

fluid to the passages i3V and 44 heretofore de scribed, as clearly shown in Figs. '7 to 10 inclusive, it'will be noted thereis illustrated as one possible .feed control means a device more Vfully illustrated anddisclosed in Patent No. 2,015,678f1i15 granted Oct. l, 1935. It lvvill be observed vthat pressure fluid flows from ay suitable source of supply through an inlet connection 10 into a 'bore 1I formed centrally in the main throttle valve 12 of the drilling motor, the valve rotatably (50 mounted in the rear head 5 of the rock drill. This valve is formed with an axial bore 13 communicating with the bore 1I, and is traversed by a radial passage 14 (see Fig. 8) connecting the bore 1I with a circumferentially-extending.x55 groove 15 on the exterior valve periphery. Also formed on the exterior valvel periphery lin the same transverse plane as the groove 15 is a circumferentially extending groove 15. Formed on the exterior periphery of the* valve, as shoWno-o in Fig. 9, are circumferentially-extending grooves 11 and 18, the former communicating with the axial boreV 13 in the valve through a radial pas-- sage 19. Arranged transversely of the rear head 5 of the rock drill is a bore 85 having mounted35 therein a rotary feed control valve 8|: Connecting the throttle valve bore With the bore of the feed control valve and lying inthe planes of the grooves 15, 16 and 11, 18 are parallel passages 83 and S2, while lying in the same planes170 as these passages and grooves, as shown in Figs. '8 and 9, are exhaust ports and 84 respectively. The passages 82 and 8'3 are communicable through the feed control valveY Si with parallel passages 8S and 81, respectively, formed'fi'nthe-' motor cylinder and communicating with `the feed vsupply passages 43 and 44 respectively formed rin the stanchion I8 and communicating with the opposite ends of the cylinder bore at the opposite sides of the feed piston. As shown, the feed control valve 8| is traversed by a passage 88 and a communicating right angle passage 89, the latter opening at one end into a longitudinally extending groove in the periphery of the valve. When the valve is in the position shown in Figs. 7 and 9, passages 89 and 88 and groove |00 connect the passage 82 with the forward feed passage 86. The valve 8| is also traversed by a passage 90 which is communicable with an axial passage 9|, in turn communicable through a radial passage 92 with the passage 83, and a diametric passage 93 with the reverse feed passage 81. As shown in Fig. 10, arranged parallel with the valve bore 80 is a passage 94 communicable, when the valve 8| is in the position shown in Fig. 9, through a passage 95, with the passage 88 in the feed control valve. When the valve is in the position shown in Fig. 10 the passage 94 is connected through a passage 96 and the transverse passage 90 in the valve 8| With a vent port 91. The valve 8| is also traversed by a radial passage 98 communicating with the axial passage 9|, and when the valve is in the position shown in Fig. 10, connects the passage 81 to exhaust through the vent port 91. The valve 8| is also provided with a longitudinal groove 99 on its exterior periphery, and this groove is communicable with the passage 82 and connects with the passage 90, one end of which opens into the end of said groove. Also formed on the valve 8| is. the longitudinal groove |00, above mentioned,` into which the passage 88 opens and which is communicable in one position of the valve with exhaust port 91.

From the foregoing description it will be evi.- dent that when the throttle valve 12 and feed control valve 8| are in the position shown in Fig. 7, pressure fluid may flow through the inlet connection 10 to the valve bores 1|, 13, through radial passage 19, passage 82, passages 89 and 88 in the valve 8|, passages 95, 94 and the forward vfeed passage 86 which communicates with the feed cylinder bore at the rear side of the feed piston. At the same time the forward end of the feed cylinder bore is connected to exhaust through the reverse feed passage 81, and passages 93, 9| and 92 in the valve 8| passage 83, groove 16 and vent 85, and as a result the rock drill is fed forwardly along the feed cylinder. When the throttle valve is rotated into its reverse feeding position, pressure fluid may flow through radial passage 14, groove 15, passage 83, through the passages in the valve 8| and reverse feed passage 81, which communicates with the feed cylinder bore at the forward side of the feed piston, while the feed cylinder bore at the rear side of the feed piston is simultaneously connected to exhaust through passage 88, through the passages in the valves 8| and 12, and the vent passage 84, and as a result the rock drill is fed rearwardlyalong the feed cylinder. The forward feed passage 88 may be connected to exhaust at will during the forward feeding operation simply by rotating the feed control valve 8| to the position shown in Fig. l0, thereby connecting the passage 86 to exhaust through passages 94, 95, groove 99, and passages 90 and 91. When the valve 8| is in this position the flow of pressure fluid to the passage 8B is cut off by thefvalve 8|. If it is desired to connect the reversefeed passage l81 to atmosphere during the reverse feeding operation, the valve 8| may be turned to connect the passage 81 with the passage 98, lbore 9|, passage 90 and vent port 91.` At this time the communication between the supply passage 83 and the passage 81 is cut off by the valve'8l. A quick reverse during feed in either direction may be obtained by other adjustments of the valve 8| but as this is fully described in the patent mentioned, and as this feed control valve mechanism does not specifically lenter into this invention, being merely illustrative of any suitable control, further description of its structure and mode of use is herein considered unnecessary.

As a result of this invention it will be noted that an improved rock drill feeding mechanism is provided whereby a direct feeding action is transmitted `to the rock drill, while the overall dimensions thereof are maintained at a minimum. It will further be noted that an improved pneumatic feeding mechanism is provided of the cylinder and piston type, wherein the feed piston is rconnected directly to the rock drill, thereby to attain a direct feeding action, and having embodied therein improved sealing means whereby the connection between the rock drill and feed piston is always maintained sealed. It will further be evident that the improved feeding mechanism is not only extremely compact in overall dimensions but is also of an extremely simple and rugged construction, all complicated connections between the power feeding element and the rock drill having been eliminated. These and other uses and advantages of the improved feeding mechanisml will be clearly apparent to those skilled in the art.

While I have in this application specifically described one form which my invention may assume -i`n` practice, and a certain modification thereof, it will be understood that this form of the same is shown for purposes of illustration, and that the invention may be further 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 rock drill feeding mechanism, a feed cylinder having a bore and a longitudinal slot extending substantially coextensively with said bore, a feed piston reciprocable in said feed cylinder bore, means extending through said slot into engagement with said feed piston and adapted for connection to a rock drill, means movable with said feed piston for always maintaining said slot sealed irrespective of the position of said feed piston in said cylinder bore, and means associated with said sealing means and movable withv said feed piston for providng a dust seal for said slot.

2. In a rockdrill feeding mechanism, a feed cylvinder having a bore and' a longitudinal slot extending substantially coextensively with said bore, a feed piston reciprocable in said bore, means extending through said slot into engagement with said feed piston and adapted for connection to a rock drill, means movable with said feed piston for always maintaining said slot sealed regardless of the position of the feed piston in said cylinder bore, means for supplying pressure fluid to said cylinder to effect actuation of said feed piston, and means for locking said feed piston against movement in said cylinder bore including a feed piston locking device and means operative when said Jsup'ltllyV of pressure vfluidto tsaid -c'ylindenr is discontinuedf'for automatically operating said locking Vdevice 'to lockV vsaid. feed `piston lagainst movementin said cylinder bore. l 1

3; In a rock .drill feeding mechanism, a feed cylinder havingfa bore and alongitudin'al IIslot extending --substantially 'coextensively with "said bore,l a feed piston reciprocable insaid boregmeans 'extending throughl saidslot into engagement'with said feed piston and adapted forconnection to a rock drill, means movable'v'vith 'said feedpiston -forI always maintaining said slotsealed regardL less of the position of 'thefeed piston in saidlcylinder. bore; meansfor lsupplying pressurefuid to saidcylinder toieifect actuation of said feed-pis- -ton, and meansfor lockingsaid feed pistonragainst .movement in saidy cylinder. bore including lock'- .in'g means engageable with said sealing "means,

yfor connecting the rock` drill directly to said-feed piston, means movable-by said feed piston for always maintaining said slot Fsealed regardless of the position of saidffeed piston in said cylinder bore, and means associated with said lsealing Vmeans for :providing a dust seal for fsaid' sealing means toprotect the same for 'its full area.-

In Ya .rock drilling SmeChaniSm, .ai feed 'cylinder having-1a bore, a'lgudeway. on which a'rock drill is slidablyfg'uided-and ya'flongitudinal'slot extending subs'tantially..coextensivelyA with 'said cylinder bore, a'feedpiston lrecipocalolein said cylinder bore, meansftextendi'ngthrough said slot `for connecting the rockdrilldirectly t'o/fs'aid,I feed piston, and. means for y'automatically 'locking's'aid feed lpiston against 4movement in said'cylinder bore when the feeding 'operation"isfinterrupted.`

l(i, In a: rock drilling mechanism, a feedcylird'er having-a bore, a .guideway on Whichfa ro'ck drill is slidably guided vand a longitudinal slot extending substantially coextensively'with 'saidcyli'nderbora `a feed piston reciprocable in. said cylinder bore, means 'extending through Vsaid slot for`connectin'g thefr'ock drill directlyto said feed piston, means for locking said feed piston against movement in said cylinder bore, means for automatically operating said locking means for locking said feed piston against movement in said cylinder bore when the feeding operation is interrupted, and means for automatically releasing said locking means when the feeding operation is effected.

7. In a rock drilling mechanism, a feed cylinder having a bore, a longitudinal guideway along which a rock drill is slidably guided and a longitudinal slot extending substantially coextensively with said cylinder bore, a feed piston reciprocable in said cylinder bore, means extending through said slot for connecting the rock drill directly to said feed piston and embodying a pivotal stanchion connection, and sealing means for said slot for maintaining said slot sealed irrespective of the position of said feed piston in said cylinder bore.

8. In a rock drill feeding mechanism, a feed cylinder having a bore and a longitudinal slot extending substantially coextensively with said hor.e,y.axfeed piston reciprocable 'in-*said feed "cylinder;'bore;.m'eans extending through said slot into engagement' with saidfeed piston andadapt- 4ed for connection to arock drill, a flexible seallingstrip 4'movable vbysaid pistonfor alwaysmaintaining said slot sealed-irrespective of the position ofsaidl feed pistonin said cylinderbore,;and a flexible dust strip, lfor always-maintaining 'said sealing strip sealed-against access of dust thereto.

9.1Infayrock drillfeeding mechanism,` in combination, afeeding motor -comprising relatively `'reciprocable ffeed cylinder and pisto 11 elements, 'mean'sfor supplying pressure fluid tof said feeding motor lto veffect relative reciprocation between said ffeedingelements, and locking means for locking 'said feeding elements againstrelative reciprocation, said locking means including a locking devicefor-said feeding elements :and mechanically operated', pressure fluid released means automatically operative When'the supply of pressure fluid :to `said feeding motor is; discontinued, for causing said locking deviceY toilock'said feeding elements against relative reciprocation, and said flocking.: means being released lby pressure fluid againstV the action of the mechanical operating means. i Y i. 10.'In arockdrillfeeding mechanism, a feeding 'motor `comprising'relatively reciprocable feed cylinder and piston elements, means for supplying: pressure fluidrto said feeding motor to effect relative 'reciprocation' betweenk said feeding elements, and -means for locking A.said feeding' elements againstrelative reciprocation, saidlocking means including a locking device..for.- said feeding elements andmeans controlledf'by the pressure in saidfeeding'motor and automatically operative when the supply of pressure fluid to said feeding motor is'discontinue'd, for causing -said locking device to :lock `.said feeding elements against relative reciprocation.

11. In'a rock drilllfeeding mechanism, in combination, av feed'cylinder Ahaving a bore and "a rlongitudinal slot Iextending :substantially 'coextensively with said bore, a feed piston reciprocable in said bore; means vextending through said'slot into engagement .with said feed piston and'adapted for connection to a rock drill, means movable withA said 'feedpiston for always maintaining said slot sealed regardless ofthe position 'of the feed piston insaid cylinder bore, 'means for :supplying pressure fluid to said feed Vcylinder to effectfactuation of said feed piston, and locking means'A for locking said feed piston against movement in the cylinder bore, said locking means including a feed piston locking device and means controlled by the pressure in said feed cylinder and automatically operative When said supply of pressure fluid to said cylinder is discontinued, for causing said locking device to lock said feed piston against movement in said cylinder bore.

12. In a rock drill feeding mechanism, in combination, a feed cylinder having a bore and a longitudinal slot extending substantially coextensively with said bore, a feed piston reciprocable means-engaging, locking device and meanscontrolled by the pressure in said feed cylinder and automatically operative when said supply of pressure fluid-to said cylinder is discontinued, for causing said locking device to lock said` feed piston against movement in said cylinder bore.

13. In a rock drill feeding mechanism, in combination, a feed cylinder having a bore and a longitudinal slot extending substantially coextensively with said bore, a feed piston reciprocable in said feed cylinder bore, means movable with said feed piston for always maintaining said slot sealed irrespective of the position of said feed piston in said cylinderbore, and means associated with said sealing means and movable with said feed piston for providing a continuous dust seal for said sealing means.

14. In a rock drilling mechanism, in combination, a support having a longitudinal guideway, a rock drill slidably guided on said guideway, said support providing a feed cylinder having a bore extending longitudinally of the support guideways, said feed cylinder having a wall thereof open substantially along the length of the cylinder bore, means extending through said longitudinal opening for connecting the rockdrill directly to said feed piston, means movable with said feed piston for continuously maintaining said longi-v tudinal opening closed irrespective of the position of said feed piston with respect to the feed cylinder, and means associated with said closure means for continuously providing a dust seal for said sealing means to protect the same for. its full area. Y

15. In a rock drill feeding mechanism, a feed cylinder having a longitudinal slot substantially coextensive with its bore, a feed piston reciprocable in said cylinder bore and to which a rock drill to be fed is adapted to be directly connected, a flexible sealing strip movable with said'feed piston for always maintaining said slot sealed, and a flexible dust strip movable with said feed piston for always providing a dust closure for said sealing strip.

16. In a rock drilling mechanism, a feed cylinder having a longitudinal seal extending substantially coextensively with its bore, a feed piston reciprocable in said bore and adapted for connection with a rock drill, means movable upon 50 movement of said feed piston for always maintaining said slot sealed, and means movable upon movement of said feed piston for always.- providing a dust closure for said sealing means.

viding a longitudinal guideway,

` 1'7. In va' rockdrilling mechanism, a feed cylinder having a longitudinal slot extending substantially coextensively with its bore,V a feed piston reciprocable in said bore and adapted for connection lwith a rock drill, an endless flexible sealing strip secured to said feed piston for always maintainingl said slot tightly sealed, and an endless flexible dust strip secured to said feed piston for always providing a dust closure for said sealing strip.

18. In a rock drilling mechanism, means proa rock drill guided on said guideway; feeding means including relatively reciprocable vcylinder and piston elements arranged parallel with said guideway, and a connection between the reciprocable feeding element and the rock drill comprising a stanchion secured to a part of the drill, and a block pivotally connected with the reciprocable feeding element and having a socket for receiving said stanchion. Y

19. In a rock drilling mechanism, means providing a longitudinal guideway, a rock drill guided onsaid guideway, feedingmeans including relatively reciprocable cylinder and piston elements arranged parallel with Vsaid guideway, and a connection between the reciprocable feeding element and the rock drill comprising a stanchion secured to a part of the drill and a. block pivotally connected with the reciprocable feeding element on an axis arranged transversely to the direction of feed, said block having a bore arranged at right angles to said transverse axis for receiving said stanchion.Y

20. In a rock .drilling mechanism, means providing a longitudinal guideway, a rock drill guided on said guideway, feeding means including relatively reciprocable cylinder and piston elements arranged parallel with said guideway and a connection between thefreciprocable feeding element and the rock drill comprising a stanchion secured to a part of the drill and a block pivotally connected with the reciprocable feeding element and having a socket Yfor pivotally receiving said stanchiomand means for supplying pressure fluid to said cylinder element to effect relative reciprocation of said feeding element including fluid supply passages in said stanchion and said block, andmeans -for maintaining communication between said` passages regardless of the .relative pivoted position of said block relative to said stanchion and the reciprocable feeding element.

, ELMER G. GARTIN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2535588 *Aug 20, 1945Dec 26, 1950Mead Theodore EFluid-driven impact mechanism
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US5222428 *Feb 14, 1992Jun 29, 1993Mannesmann AktiengesellschaftPiston cylinder unit for pressure fluids
US5469940 *Jan 22, 1993Nov 28, 1995Smc CorporationRodless cylinder unit with brake
US5941350 *Mar 22, 1995Aug 24, 1999Smc CorporationRodless cylinder unit with brake
US7404353Mar 10, 2005Jul 29, 2008Sunstream Scientific, Inc.Pneumatic cylinder for precision servo type applications
US7587971 *Mar 21, 2005Sep 15, 2009Sunstream ScientificPneumatic actuator for precision servo type applications
US8015913Jul 28, 2008Sep 13, 2011Sunstream Scientific, Inc.Pneumatic cylinder for precision servo type applications
US20050223888 *Mar 21, 2005Oct 13, 2005Kriegsmann Michael KPneumatic actuator for precision servo type applications
US20090007770 *Jul 28, 2008Jan 8, 2009Sunstream ScientificPneumatic cylinder for precision servo type applications
Classifications
U.S. Classification92/20, 92/137, 92/28, 92/88
International ClassificationE21B19/00, E21B19/086
Cooperative ClassificationE21B19/086
European ClassificationE21B19/086