US1868294A - Feeding device for rock drills - Google Patents

Description

July 1 9, 1 932. w. A. sMlTH, SR., ET AL 1868,294

FEDING DEVICE FOR ocx DRILLs Filed Jan. 24, 19:50

THE/l A TORNEY Patented July A19, 1932 UNirEn"sA'rATi-:fsv 'PATENroI-i-"1ci-:1-

WILLrAM A. sMrfrfii, sn., or nAs'roN, PENNSYLVANIA, ANii WILLIAM A. SMITH, Jn., oir riirinirsnunag NEW JERSEY, AssrGNcns To INGERsoLL-BAND. COMPANY, or' I JEiasiiYciTY, NEW JnnsnY, A conPonATioN on NEW JERSEY, c

` FEEDINGVDEVICE FOR ROCK DRIiIiLS v Appncauon nieu January 24, 1930. serial-No. 423,066.

This invention relates to feeding devices, but more particularly ,to a device of this character adapted for actuating a rock drill rela-` tively .to its support, such-as a shell whereon rock drills of the drifter type are usually mounted to enable vthem to be readily advanced towards the work inaccordance with the penetration-of the. drill steel into the material being drilled.

One object of the invention is to enable the rock drill tobe moved longitudinally of its supporting shell by the force of the hammer piston uponreversal of said hammer piston at the end of one of its strokes and at the same time to prevent recoil of the rock drill at the insta-nt of such reversal.

Another object is to enable the rock drill to be readily actuated longitudinally of the sh-ell either in the direction of the work or in a reverse direction, and still another lobject is to enable the feeding device to be automatically reversed.

Other objects will be in part in part pointed out hereinafter. n

In the accompanying drawing illustrating the invention and in which similar reference characters refer tosimilar parts,

Figure 1 isa longitudinalplan view, partly brolren away, of a .rock drill and its supporting shellV having the invention. applied obvious and thereto,

- Figure 2'is a side elevation, partly in section, showing an enlarged view of the feeding device, the said feeding device being adjusted to the position for feeding the rock drill towards the work, and

Figure 3 is an end elevation `ofFigure 2 and partly in section illustrating the man' ner in which the movable elements ofthe feeding/device may be locked in vplaced position. 1 Referring more particularly to the 'drawing, A designates a rock drill which may be of the Vdrifter type, and B a supporting shell for the rock drill A; Y' The shell B has ltheV usual guideways C to slidably receive ribs carri-ed by the cylinder E Vof the rock drill ,The rock drin Aim, the ugual from and back heads F and G which may be suitably Vingto move it bodilyrin the direction Vwhich the piston is traveling.

Y that its .rear

securedto the cylinder-E by meansof side rods H. yThe front head F acts as a guide for a .working implement, such as a drill steel J, and within the cylinder is a reciprocatory hammer piston-K -to deliver'blows of impact against the working implementJ 'for vdriving it into the work. f

The pressure Huid utilized' for actuating the piston K may be distributed to the ends of the cylinder E by any suitable form of disf tributing valve (not shown) and communication `between .the distributing 'valve and the source of pressure fluid supply may be controlled by a suitable throttlevalve, only the manipulating lever L of which is shown.

In accordance with the present invention means are providedA for enabling the rock drill A to be moved longitudinally of the shell B by the jar resulting Aupon reversal of the hammer piston K at the ends ofitsstroke.

As'will be readily understood hammer pistons of this type travel at a high rate of speedl so that upon the impact of the hammer piston against the Working implement as Well as'when the piston reverses itsdirection of movement, at the end of its return stroke a heavy jar is imparted to the vrock drill tend- 1n It is an *object of this invention to utilize such shocks or jars for actuating theentire rockv drill longitudinallyof the shell. The rock drill is accordingly provided with read-` ilyy adjustable meanswhich are adapted to intermittently seizeand release the shell B or elements iixedly secured thereto to pre# vent recoil of-.therockdrill when the piston reverses in one end of theV cylindenand toV enable the rock drill to -be` moved along" the shell by the jar resulting upon reversal of the piston in theother end of the cylinder.V The stationary means associated with the shell B mentioned hereinbeforemay consist Y Y y of a rod O which is preferably disposed Within the coniines of the shell Bgand isseated with -itsfforward end in a bearing plate `P secured to thefront end of the shell B by means of bolts Q. The rod() is preferably of cylindrical form and maybe of such length end extends beyond the correspondinglend'of the shell B. yIn structures wherein the length'of the rod O exceeds that of the shell B the rear end of the rod() may be suitably supported by a cross head R which Y itself .is supported by bolts S, secured in any suitable manner to the rearendof the shellv B. y Preferably the rod O is providedwith a flange T rto seat against the inner surface of thecross head R'Aandthe end Uroftherod O which projects rearwardly ofthe cross head VR is threaded to receive a nut V wherebyy therod may be secured iXedly againstendwise movement. `This arrangement' also enables the position of the rod Oto-bevreadily lchanged whenever it is Adesired to ypresent a new bearing. vsurface for the*l element where- 1with. the rod O is adapted to. cooperatei for advancing the rockdrill` A. relatively: to the stancehas a lateral ange Z whichis seated` against the back end'of the back head G. In the flange Z are apertures?) tofaccommodate the side rods 'H ofthe rock drill andv whereby the bracket Y maybe securely clamped? to the' back head Gr; f Y

Y Thelink W is ladapted-to assume-alateral position' with respect torthe 'rod and hasin its free end an aperture c throughfwhichfthe rod, O'extendsand the aperture c is` of some-V what larger diameter than thevrod Orso-that the link ,WV willrbe7 capable of some degree of oscillatory movement with-respecty to the g The front and rearends or edges' of the aperture c constitutes-grippingedgesl andev respectively which,`whenthe linkW occupies aninclinedposition, are adapted.. to grip fthe sur-face off'the rod'Ofor preventingrecoil of the yrock drill, dependingupon the direction in which itis intendedY to-actuatevthe rock drill and Yupon the direction-in which the link V'inclines'., Y

f Means are providedftoholdthe link in thedesired operative position and-'to'urge the saidlink constantly in position to assure an immediate gripping actionv thereof on the rodU-and thus avoid anyrtendency of the rock drill A to recoil rupon the occurrence of a; shock due to'the'reversal of the Ypiston-CK inthe cylinder EL The means provided for this' purpose comprises aiguide rod ,f which extends slidably through` an apertureg in the f link W and `in this instance located intermei diate the aperture "c and the bolt'Xv.

. The guide'rodf` may be of suitable length disposed' forwardly and rearwardly respectively. of the link W and againstprwhich they end of theguide rod f is a head k ragainst f which the rear end of the` spring' j is adapted .to-bean' and on the front end ofthe guide rod 'f is threaded a-nut oto forni a seat for the front end of the spring L and also to vary the tension-ofthe springs h1 and j. Y'

In order to enable the link Wto be manually adj usted'to thevarious'positions which it may assume as well as to selectively setup a tension in either of the springs h and j',

the head1@ of thefguiderod f is pivotally connected toa lever p which has a shaft g seat with their adjacent ends. 0n the rear `r 'rsi journalled in the bracketY so that when the lever p is oscillated in one directionV or the other, one of the springs L or j will be comsity of constantly applying pressure kto thek pressed to.v exert a yieldable pressure against f lever.Y 7 f'or the purpose of insuring ythe correct position of the link W,'thegrip portion s of the lever 1 is provided with a bore t to accommodate a spring pressed plunger@ having a head c) which is adapted toV engage sei-rations fw forlocking the levers p and 1 in the desired operative position. The` serrations w may be suitably formed in arcuate formation on the side of the bracket Y so that an ample contact between the vhead v of the plunger 'a and the said serrations will be assured. Y Y v Y Y v The locking contact between theheadv 'v of the plunger u and the'serrationsis preferably such that the levers Y' and p will remain in position to hold one orthe other ofthe springs 7L or j'under compression unaffected by the vibrationsincidentto the operation of the'd'rilly A. Y

To theend that the linkv W' may be au-A tomatically reversed from the position' which A plunger 3 has' a'hollow headwhichlies within the bore 2 an-d a spring 4 seating with one end against one end. of" the bore 2 actswith it-s otherendv against the Y'plungerA 3' to hold said plunger in thekrear end of the bore 2.

A convenientl support is provided fortli'e bearing a and said support connprises a main clampingmember 5 whichembraces the'shell `to receive a pair'of springs and'jwh-ich are Band carries on one 'endhooksV 6 which may comprises a bearing a the shell B designated generallyl by a', is provided to 'act Y engage the edge of the shell B: In .the oppo-- site side of the clamping member is disposedt a shoe .7 which may be moved laterallyl of thel shell B by means of a set screw 8 in the4 clamping member 5. The shoe 7 may also be' provided with a hooked portion 9-to overlie the edge of the shell adjacent to the shoe. This arrangement enables the 'clamping member 5, as well as the plunger, to be readily adjusted along the length of the 4shellby merely manipulating the screw Sto-freleasel the clamping hold on the shell after, which the clamp together with the abutment may be readily shifted along the length of the shell. The operation of the device is asfollows:` Let it be assumed that the .rock drillA is'in` is of course essential that the said rock drill be actuated longitudinally of the shell B in the direction of the work so Vthat the full force of the hammer piston against the working implement J may be effective for driving the'said worki ng implement into the work.

In order to constantly assure this position` of the percussive element of the drill with respect to the working implement J the levers 1 and p may be` rocked forwardly t'o cause f the link W to assume a similar position. The

i au" spring 7' will thus be compressed so that it constantly tends to force the linklW in the direction in which it `is desired to move the rockdrill A. In this position of the link W the gripping edge e, which is the rear edge of the aperture c, will frictionally engage the surface of the rod O, and the link W will be maintained in this position as will also the levers r and p by the plunger u which engages one of thel serrations w.

With the rock drill in operation the jar caused by the hammer piston as it strikes the working implement J and by its act of reversal will be transmitted tothe rock drill so that as the rock is being gradually reduced by the working implement the rock drill A will be carried forwardly bodily in the direc-Y tion of the work. By `its gripping action upon the rod O the link W will prevent the rock drill from recoiling so thatl the rock drill will be held ixedly in position and the maximum effect of the blow of the hammerpiston K against the working implement J will therefore be obtained. In the subsequent operation of the rock drill this cycle will-be repeated until the working implement J has penetrated the work to the desired depth. The linkW will alternately grip and release the rod O in such wise that any movement of the rock drill resulting from the jars of the piston K will only be in a forwardly direction since, when the piston K changes its direction of movement in the rear end of the cylinder E, the rock drill will plunger 3; 'The spring 4 will thenbe compressed by the continued forward movement of the rock drill yuntil the plunger strikes .the

front endl of thelbore 2 in the abutment e.;

Thereafter Vas thedrill proceeds forwardly the levers#a and p will be gradually oscillated4 rearwardly, as will also bethe' guide rod `f, thus releasing thecompression in the springj and .placing 'the spring bunder compression".`

This movement ofthe 'levers will, of course,

also be expedited somewhat by -the'force pre-fv viously stored inthe spring. i 1

As willl readily be seen, by changing p position'of the levers 7' and .Ap `and by placing the spring under compression the position' j, of the links W will also bereversedtthus bringing thel gripping edge al into a position to frictionally engage the rod O. Meanwhile Y the rock drill A- will continue its operation, 1

and with the link W inthe new position the gripping edge cl will intermittently grip and release the rodO. Therefore, when thepis'- ton reverses its direction of movement in the frontend of the cylinder E the gripping edge el will prevent the rock drill from `being carried forwardly, and at the end ofthe rearward stroke of the piston K the jar caused by the reversal of the piston `will cause thev rock drill A to be movedvbodil'y infa rearwardly direction to return it to itsinitial position preparatory to the drilling of a newhole. j

In practice, the present invention has been found to be extremely 'eflicient This is` largely due to the fact that the percussive element o f the drill will always be in the proper positionl relatively to the drill steel so that the maximum effect of the blow thereto may be obtained, and lalsoinf-part due to the fact that the 'drill is' not Vsubjected to a heavy pressure-tending to drive-it 'in the direction of the work. The link merely holds the rock drill immovable. to prevent recoil thereof during the reversal of the piston at the end of one strokeV and allows'thelrock drill to be actuated alo-ng the shell during the reversal of the piston at the end of the return stroke. l Ve claim: A

ico

lll)

l. Ina feedingdevice, the combination of? agsupportand a motor slidably supportedby the support, a working implement, a hammer piston reciprocable in the'motor to actuate the working implement'and to move,A

the motor longitudinally ofthe support, a rod supportedV by the support, a linkcarried Yby the motorto frictionally engage the rod' for preventing recoil of theymotor during the motor., aspringiassociated With, thegsaid?v meansV and I:acting Vagainst the link toi;y main*-1 tain the link in frictional Contact Witlii' the rodf and separate pivots for the link` and; the adjusting means. y -f .l

2. Inaffe'edin device, the combination of" a` support andV ar motor slidably supported. by thesupport, a Workingimple'ment,.a hamT mer pistonreci'procable in the motorwto,v actuate thezworking -implement'and to, actuate f themotor longitudinally.ofthesupportp a.

vrrod supported. by the support, :al link: carried bythe motor toV frictionally engage the rod Y for. preventing recoil` ofthe motor, manually.

operable spring.4 Vpressed means;` acting against the, link to` maintain saldi-link` 1n,k

Vfrictional engagement Withrcthe .rod and means on. vthe support forming an abutment for the spring; pressed meansito shiftthe link. and thus,y cause the motor to movel in al reverse'direction'. 'y c v 'In` ay feeding device,zthe combination of avvsupport and aimotor slidably-supported by 'thesuppora a Working implement, a. hammer Apiston reciprocable in thev motor to Aacltuatethe Working-implementand to actuate rod supported by the-support, a, link carthe linkinto frictional engagement With the the motor longitudinally. ofV the support, al

rod. l

14;. In a feeding device, the. lcombination of ar support and a. motor` slidablyysupported by thesupport,a Working implement, a hammer piston reciprocable inthe motor to ac tuate the Working implement and to actuate the'r motor longitudinally of the support, a

Y rod supported by thel support, av bracket carried by the motor, a link `p ivoted Vto the thea-i` working implement. and to movel the; l.

motor, longitudinally' of kthe:sup]g ort=,a rod:A

supportedf .by the support, i a link carried: by

themotorto frictionally engage the rodi for preventing recoil; ofa the motor upon` revers al ofthev piston at Vthe end 0i' one vstroke and torelease the. rod;r upon; reversal Vof the /piston', at t-lieendV of; the opposite stroke, a; guide rodi-extending .slidablyr through the link,l

'springs on. the; guide rod: acting,- .against the opposite; sides of?. the'. flink, a 'lever on, the

motorv pivotally connected; to; thei guidev4 rod 4foradjustingthe positionA of the link and to place oneA orfthe other of the springs under compression for urgingA the link into fric-y tional.. engagement With the rod, a bearing adapted tol be' secured to, the support, and

a spring pressed plungerin the bearing to reverse the` 'said means and the flink, thereby` enabling'the motor to be actuated in 'ai reverse direction by 'the piston.

'6; In ai-frfeerdingk device, the combina-tion.y

with aV support and: av percussive motor on thel supportI andbeing subjectedito jars incident te its operation tending to movey they motoralong the support', ofrecoilarresting;

meansforA themotor; ,and means on,y theV sup-Y port;V to I shift the recoil arresting means-for` reversing; thefdirection ofi movementl of the'i motor relativelyftotlesupport.

In Vtestimony whereof; We have signed; this specification Y ,WILLIAMA., SMI-TH, SR;

bracket and adapted to frictionally engage u the rod, spring pressed means for urging c y the linkjinto frictional contactwith the rod,

a lever -pivotally connected to they bracket and to the said` means for adjustinglthe posi- VtionV of the link to enable the motorto travelin either directionrelatively to the support,-

4 serrations on the bracket, and a` spring,

i pressed plunger in the lever-to engage the, Y serrations for locking the' link in( they adi justed position.

l5. In va feeding device, thek combination Y of a supp'ortand amotor` slidably supported thereby, a Working implement, a hammer, piston reciprocable .in ,1 the: motor to actuatee

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