US2365687A - Drilling implement guide - Google Patents

Description

Dec. 26, 1944. J CURUS, 2,365,687

DRILLING IMPLEMENT GUIDE Filed June 15, 1942 2 Sheets-Sheet l Dec. 26, 1944. J. c. CURTIS 2,365,687

DRILLING IMPLEMENT GUIDE Filed June l5, 1942 2 Sheets-Sheet 2 vinili Mk E Patented Dec. 26, 1944 DRIIQLING IMPLEMENT .lohn e.l Curtis,.(3ime1nmnt,r N.- H., assigner to Sullivan Machinery Company, .-alcorporation of Massachusetts Application June 15, 1942;"Seri'al' No. 447,016

1i claims. .tonces-51X "This invt-rltionr relatesto` rook drills and `more particularly to improvements. ina guide for the drill steelof aliammer rock drillof-'the mounted drifter type.

Inrock drills of thefmounted drifter'type, a i

drilrhammer rrxotorfor` percussivelyi actuating a drill Vsteclj'is usually mounted on the guideways of fa guide shell, and the 'latter in turn is suitably supported with respect to the-work. In suoliV rock drills; a guid'eis :often-provided' at the frontend ofthe guide shell to center andrguide the drill steelduringstarting orv "spotting" ofla drill hole. Astiredrill` hammer motor-*is fed forwardly along the guideways 'ofthe'guide shell and the forward endofthe hammer motor approaches the drill steely guide',` it is desirabletoeffect automaticielease'of the e'uidefromtheY drill steeland' to; effect rrimfernentI of the guide into itsnon-'guiding l position out of the-pathV` omovement ofthe hammer motor so that the `latter may be fed along thev shell guideways forwardlyy past'the" guide.` It is also desirable to provide av guide structure which is relatively simpleand rugged' in designylight in weight and estremely 'confinati-it;` while providing for `adem-late centering-and guiding lof theA drill steel. i

Itis'an-object of thepresentinvention to pro'- videa novel drillsteelguide which' embodies the desired features'above'outlined; ini that it is not onlvautomatically* releasible and simple and rugged design-,hut also provides"v for adequate centering and' guiding' of the drill steel. Another object is to provide a noveldrllsteel guidehaving improved mounting means forA the guiding Velerelentsthereof;V lA further object is to provide imlprovedresilient means-for yieldingly holding: the guiding elements Viii-guiding: position and forautomatically moving' the guiding-elements into their non-guiding position when the holding means is released; Yet another Objectis to provide a novel' drill steel guide having a combined torsion and compression spring for controllingmovements of the guiding elements. A still further olhject is tol provide an improved drill steel guide which is automatically releasableby` engagement of the dri-11 hammer motor' therewith as the latter moves forwardly alongJ its supporting guide. Still another ob-jectis'to provide a novel drill steel guide of the pivoted guide arm type and emloodyirigim` provedmounting'means forthe guidearms wherebythe latter may'beeitherseparately or concurrentlyplaced ina guiding relation with the drill steel. Another object is toprovide ai'novel drill guiding `position `and for autornaticall5`fv effecting swinging-'of the-guide arms into their released non-guiding positionwhen the `locking means is released. A furtherobject is to `provide a, novel spring arrangement for hold-ing the -guide arms in guiding position and for moving the guidearrns into theirreleasedposi'tion. With the above and otherA objects in view, this invention "relates to certain novel featuresiof construction, operation' and arrangementof parts,` two examples of which are` given in the specication and' illustrated in the accompanyingdrawings, wherein:

Fiel-i is a side elevationalI viewof the forward portion' oi a rock drill equipped with a preferred illustrative embodiment of the drill steelguide.-

Fig. 2 isa frontl end elevational View of the rock 'drill and drill steel guide Vshown in Fig- 1, the drill steel-beirig in cross section.

Fig'. 3 is across' sectionalview taken substantiall-y-on linel-S of Fig. 1, showing the drill steel euidein its `guiding position.

\ Fig. `4 isf a View similar to Fig. 3,-showingf the drill steel guide in its released non-guiding position'. l y

Fig; 5 is a horizontal sectional View taken sul stantially on line y 5-`-5 of` Fig; l.

Fig. 6-is a fragmentary cross sectional View takensuhstantiallv ony line 6`ll of Fig. 1.

Fig. 'Z' is al' fragmentary View in longitudinal vertical section taken :substantially on line lf-l Olf Fig; 2. l

Fig. 8- is a sicleelevationali View simi-lar tol-Fig. 1, illustrating `a. modified lembodiment of the drill stell guide.A

i Fig. 9` is a front-end elevational View of the rock drill drill steel guide-- shown in Fig. 8, with parts shown in vertical section. Y Fig'. liti isa crosssectional viewtaken substantiallyon `lir1el|J"-Iill ofFi'g. V8, showing the drill steelguidfe in its released non-'guiding position.

Eli-gull! is a `horizontal sectional View taken substantiaifi-yy on4 liney H-#If of Fig. 8.

` Figi f l2l is a fraementaryA view in" longitudinal vertical section'taken substantially on line l2-I2. of"l5"ig"."9`.` f r e 4 Fig. 13Uis a fragmentary' view `in longitudinal vertical section tal'cen'subs, i',aritially` on line |3-v-l'3 steelg'uideofV thefpivoted guide arm typehaving improved rrieans` -for locklngf the" guide armsin ventioir which is an' improvement overthat disclosed in a cop-ending application Ser. No.v 411,283,Y

chuck within a front chuck housing suitably attached to the forward end of the motor cylinder. The motor cylinder has usual lateral guides 6, E slidingly received in longitudinal guideways 1, 'I of the guide shell. The hammer motor may of the spring. lThe spring urges the guide arms rearwardly into their locked position shown in Fig. 1 in abutting relation with the rear plate and with the locking lugs I'I in locking engagement with the plate surfaces I8. The coiled portions 2| of the spring also serve automatically to swing the guide arms about their pivots from their guiding position to their released non-guiding position shown in Fig. 4, when the locking lugs I1 are released from the plate surfaces I 8. The lugs I'I on the guide arms, when the arms are `swung apartas shown in Fig. 4, engage the lower portion of the bearing boss I4 thereby to limit 'outward swinging of the arms. When the be fed in a well known manner along the shell guideways toward and from the work by means of a conventional feed screw 8 journaled on the guide shell and engageable with a feed nut carried by the hammer motor so that when the feed screw is rotated, the hammer motor is fed along the shell guideways. Since, as stated above, the rock drill is of a conventional design and is well known to those skilled in the art, further description and illustration thereof are herein unnecessary.

Now referring to the preferred 4embodiment of the invention shown in Figs. 1 to 7 inclusive, it

will be noted that the drill steel guide generally designated 9 includes front and rear transverse plates I0 and II, attached by bolts I2, herein preferably three in number, to the front end of the guide shell 2 (Fig. 5). These transverse plates are held in spaced parallel relation by spacing sleeves I3 surrounding the bolts between the plates, as shown. In this instance, the rear plate Il has an integral bearing boss I4 in which the front bearing portion of the feed screw 8 is journaled. Pivotally mounted on the spacing sleeves I3 of the upper pair of bolts, is a pair of cooperating guide arms I5, I5 each having an appropriately shaped guiding portion IB. The guiding portions I 6 of the guide arms are engageable with the body of the drill steel 4 to hold the latter centered during starting or spotting of a hole in a manner well known to those skilled in the art. The guide arms are also mounted on the spacing sleeves I3 of the upper pair of bolts for bodily or translatory sliding movement relative thereto between the plates I0 and I I, and the guide arms have near their pivots downwardly projecting locking lugs I'I engageable, when the arms are in their rearmost guiding position, with opposite vertical side surfaces I8 of the rear plate II (see Figs. 1 and 6). As shown, projecting rearwardly from the rear faces of the guide arms are abutment bosses I3 with which the front end of the chuck housing 5 of the drill hammer motor is engageable. A spring common to both guide arms has coiled portions 2|, 2| encircling the spacing sleeves I3 of the upper pair of bolts and these coiled portions are interposed between the front surfaces of the arm hubs 22 and the rear face of the front plate, as clearly shown in Fig. 5. The coiled portions 2| are connected together by a cross portion 23 extending therebetween, and the end portions 24 of the spring engage the inner sides of the guide arms. The arm hubs 22 are recessed at 25 to receive portions of the spring coils and the hubs are laterally cut away at 26 so as to provide clearance for the,

hammer motor guides 6, 6 when the guide arms are swung into their wide open position, as shown in Fig. 4. The inner sides of the arms are recessed at 21 to receive the end portions 24 arms `are wide-apart,the drill hammer motor may move forwardly along the shell guideways past the guide, and as will later be described, the arms are shoved bodily forwardly to effect release of the locking lugs by engagement of the front end of the hammer motor with the abutment bosses I9 on the guide arms. Thus the spring has both compression and torsion functions and the coiled torsion spring portions react on the arms themselves, therebetween.

The modied embodiment of the invention shown in Figs. 8 to 13 inclusive is generally similar to that above described. In this construction, however, the coiled portions of the spring are removed from the vicinity of the arm pivots so that there is no cooperation between the spring and the arm pivot bearings. Also, in this instance, the spring does not act on the arms to move the latter rearwardly into their locked guiding position. As shown, the hubs 29 of the guide arms I5 are formed with longitudinal bores 30 which receive spring-pressed plungers 3| acting against the rear face of the front plate I0, and the plunger springs urge the `guide arms rearwardly, in the locked guiding position of the latter, against the rear plate I I. A torsion spring 32 has coiled torsion portions 33 received in recesses 34 formed in brackets 35 secured to the front surfaces of the guide arms. These spring brackets are arranged forwardly of the front plate I0 inadvance of the attaching bolts, in longitudinally spaced relation with respect to the guide arm pivots (Fig. 11). A cross connecting portion 3 6 of the spring extends between the spring coils, and the spring brackets are slotted at 3'I to clear the cross spring portion as the guide arms swing about their pivotal axes. These. brackets are also cut away at 38 to provide clearance for the hammer motor guides when the guide arms are in their wide open position shown in Fig. 10. The end portions39 of the spring are engaged in notches 40 in the spring brackets (Fig. 12). Otherwise, this embodiment of the invention is generally similar to that above described.

t will be evident that in lieu of the single spring having coiled portions ln coincidence with the arm pivot axes, separate torsion springs, one individual to each guide arm, may be employed. In such aseparate spring arrangement, it would be necessary to connect the springs 'between the arms and parts stationary with the front plate to provide suitable points of reaction for the springs, in an obvious manner.

In the operation of the preferred embodiment of the drill steel guide above described, when it is desired to start or spot a drill hole the guide arms I5 may be swung about their pivots into the guidingy position shown in Figs. 1, 2 and 3 with the' guiding portions I 6 in engagement with the body of the drill steel 4, and at that time, the guide arms are locked in guiding lacking lugs I'I in lockingV engagement with asoma? position:` by `engagement of: the locking lugs I1 with the vertical surfaces I8 on.the rear plate. As Vthe fdrillhammer motor I is fed forwardly alorigmthe Ashell guideways 1,1, the front chuck housing engages the abutmentv bosses I9 on the guide arms: and, upon continued forward movement' shoves `the arms forwardly bodily along ,the spacing sleeves on which they are mounted, `to effect release of' the locking lugs II from'the platesurfaces I 8. When the guide arm locks are released, the torsion spring acts automatically to throw the guide arms into their wide open vnon-guiding,positionshown in Fig. 4, so that theldrill hammer motor may move forwardly `between. the guide arms without interference therewith. Under certain conditions, the guide arms may 4be `separately, placed in guiding relation with the drill steel so that but asingle guide arm may serve as' a guide, for instance duringspotting. of a drill hole` on anv inclined surface when but a single guide arm lwill suflice to `'prevent lateral `deflection of the steel. When itis desired again'to'position the guidearms I5 inguiding Vrelation with the drill steel, the operator may manually swing the 'arms against the` tension of the torsionspring Zillinto engagementi with the drill steel and thenf shove the guide arms bodily 'rearwardly into abutting en- -gagement with the rearsplate Il with the arm the plate surfaces I8.

The operation of the modified embodiment of the invention is generally similarto that above described, in that the guide arms move into and out of guiding relation with respect to the drill steel in a substantially similar manner. In this instance, however, the guide arms are swung apart by the torsion spring 32 and are moved rearwardly into their locked guiding position by the springs associated with the plungers 3|. The

guide arms are released from their locked guiding position byV engagement of the chuck housing of the drill hammer motor therewith as in the preferred `embodiment of the invention, and the guide arms are shoved bodily forwardly into their released position against the action of the springs associated with the plungers Whenthe guide arm locks are released, the torsion spring 32 automatically `swings Vthe guide arms into the wide open non-guiding position shown in Fig. 10,

The guide arms maybe moved manually into their guiding position in Vsubstantially the same manner as in the preferred embodiment of the invention above described.

As a result oi this invention, it will be noted that an improved -drill steel guide is provided whichisnot only relatively simple and compact indesign, but is also rugged in construction. It will further be evident that by mounting the guide arms in the manner disclosed, the locking means is simplied, and further by the particulararrangement of the torsion spring, the guide arms are automatically swung into their released non-guiding position in an extremely eiective `manner Further, by means of the` parti-cular ment with a drill steel ,and translationally longitudinally of the drillsteel, mounting means for said :guiding elements, means for holding said,

guiding elements in steel guiding position, and resilientmeans connected between and engaging said guiding elements for automatically independently moving said guiding elements laterally away from the drill steel into `their released nonguiding position when said holding means is rendered ineffective, said resilient means comprising a co'iltorsion spring having Aoppositely, acting coil portions, one coil' portion acting on each guiding element, and said coil portions urging said guiding elements translationally into the position wherein they are held by said holding means in guiding relation with the steel.

2. In a drill steel guide, a pair of cooperatingy guiding `elements engageable with a drill steel, mounting means for said guiding elements, means for holding said guiding elements in steel guiding position, and resilient means connected between and engaging said guiding elements for automatically moving said guiding elements into their released non-guiding position when said holding means is rendered ineffective, said resilient means also yieldingly urging said guiding elements into a position to render said holding meanseiective.

3. In a drill steel guide, a pair of cooperating guiding elements engageable with a drill steel, mounting means forsaid guiding elements, means for holding said guiding elements in steel guiding position, and resilient means connected betweenl and engaging said guiding elements for automatically moving said guiding elements into their released non-guiding position when said holding means is rendered inelectve, `said' resilient means being supported by said guiding elements in a position spaced in a direction lengthwise of the drill steel from the mounting means for said guiding elements.

4. In a drill steel guide, a pair of cooperating guiding elements movable laterally vtoward and from one another into and out of guiding relation with a drill steel and translationally longitudinally of the steel, mounting means for said guiding elements, means for holding said guiding'elements in their Steel guiding position and releasable upon translatory movement of said guiding elements, and resilient means for moving said guiding elements laterally away from the drill steel into their released non-guiding position when saidholding means is rendered ineffective, said resilient means comprising a torsion springengaging and acting between said guiding elements, said torsion spring having oppositely acting coil portions, one coil portion acting on each guiding element and said coil portions serving to urge said arms translationally toward their held position.

5.*In a drill steel guide, a pair of cooperating guiding elements movable toward and from one another into and outl of guiding relation with a drill steel, mounting means for said guiding elements, means for holding said guiding elements in their steel guiding position, and resilient means for automatically moving said guiding elements into their released non-guiding position when said holding means is rendered ineffective, said resilient means comprising a torsion spring extending and acting between said guiding elei ments, said spring being supported by said guiding elements in a position spaced in a direction lengthwise of the drill steel from the mounting means for said guiding elements.

6. In a drill steel guide, a pair of cooperating guiding elements movable toward and from one another into and out of guiding relation with a drill steel, mounting means for said guiding elements, means for holding said guiding elements in their steel guiding position, and resilient means for automatically moving said guiding elements into their released non-guiding position when said holding means is rendered ineiective, said resilient means comprising a torsion spring extending and acting between and engaging said guiding elements, said'resilient means also holding said guiding elements yieldingly in their guiding position wherein they are held by said holding means.

7. In a drill steel guide, mounting means, a pair of guide arms supported by said mounting means for pivotal and translatory movements with respect thereto, means for locking said guide arms in their guiding position, said lock- .ing means being releasable upon translatory movement of said guide arms with respect to said mounting means, and resilient means common to both guide arms and engaging the latter for yieldingly holding said guide arms in locked position and for automatically swinging said guide arms about their pivots into their nonguiding position when said locking means is released.

8. InI a drill steel guide, mounting means, a pair of guide arms supported by said mounting means for pivotal and translatory movements with respect thereto, means for locking said guide arms in their guiding position, said locking means being releasable upon translatory movement of said guide arms with respect to said mounting means, and resilient means common to both guide arms for yieldingly holding said guide arms in locked position and for automatically swinging said guide arms about their pivots into their non-guiding position when said locking means is released, said resilient means comprising a torsion spring extending and acting between and engaging said guide arms for eiTecting both pivotal and translatory movements of the latter.

9. In a drill steel guide, mounting means, a pair of guide arms supported by said mounting means for pivotal and translatory movementsl with respect thereto, means for locking said guide arms against pivotal movement in their steel guiding position, said locking means being releasable upon translatory movement of said guide arms with respect to said mounting means, and resilient means for yieldingly holding said guide arms in locked position and for automatically swinging said guide arms about their pivots into their non-guiding position when said locking means is released, said resilient means comprising a torsion spring extending and acting between and engaging said guide arms, said torsion spring also urging said arms translationally toward locked guiding position.

10. In a drill steel guide, a support, a pair of cooperating guide arms mounted on said support to swing into and out of guiding relation with a drill steel and for translatory movement longitudinally of the steel, and a coil torsion spring engaging and acting'between said guide arms for swinging said arms in one direction about their pivots, said spring having torsion coils, one coil acting on each guide arm for swinging the latter, and said coils also serving to urge said arms translationally in one direction.

1l. In a drill steel guide, a support, a pair of cooperating guide arms pivotally mounted on said support to swing into and out of guiding relation with a drill steel, means for locking said arms to said support in guiding position, and a spring extending and acting between said guide arms and engaging the latter for swinging said guide arms in one direction about their pivots, said spring having coiled portions arranged in coaxial relation with the arm pivots, and said coil portions serving to urge said locking means toward arm locking position.

12. In a drill steel guide, a support, a pair of cooperating guide arms pivotally mounted on said support to swing into and out of guiding relation with a drill steel and having translatory movement relative to said support longitudinally of the drill steel, and a spring extending and acting between said guide arms and engaging the latter for swinging said guide arms in one direction about their pivots, said spring having coiled portions arranged in coaxial relation with the arm pivots but in longitudinally spaced relation with respect to the arm pivot bearings, and said coil portions opposing translatory movement of said guide arms in one direction.

13. In a drill steel guide, a support, a pair of cooperating guide arms pivotally mounted on said support to swing into andout of guiding relation with a drill steel and having translatory movement relative to said support longitudinally of the drill steel, and a sprin'g extending and acting between said guide arms and engaging the latter for swinging. said guide arms in one direction about their pivots, said spring having coiled portions arranged in coaxial lrelation with the arm pivots, said coiled portions having a crossconnecting portion extending therebetween, and said coil portions serving to oppose translatory movement of said guide arms in one direction.

14. In a drill steel guide, a support, a pair of cooperating guide arms mounted on said support for pivotal and translatory movements with respect thereto, and a spring common to said guide arms and engaging the latter for effecting both the pivotal and translatory movements of said guide arms.

15, In a drill steel guide, a support, a pair of cooperating guide arms mounted on said support for pivotal and translatory movements with respect thereto, means for locking said guide arms to said support in their guiding position in engagement with a drill steel, said locking means being releasable upon translatory movement of said guide arms with respect to said support, and a torsion spring common to and connected between said guide arms and engaging the latter for swinging said arms apart when said locking means is released, said torsion spring having outwardly acting ends, one spring-end engaging each guide arm ,between the arm pivot and steel engaging end of the arm.

16. In a drill steel guide, a support, a pair of cooperating guide arms mounted on said support for pivotal and translatory movements with respect thereto, means for locking said guide arms to said supportiin their guiding position in engagement with a drill steel, saidlocking means being releasable upon translatory movement of said guide arms with respect to said support, and a spring common toand connected between said guide arms and engaging the latter for swinging said arms apart when said locking means is released, said spring having coil portions n coaxial relation with the arm pivots.

17. In a drill steel guide, a support, a pair of cooperating guide arms mounted on said support for pivotal and bodily movements with respect thereto, means for locking said guide arms in their guiding position, said locking means being releasable upon bodily movement of said guide arms with respect to said support, a spring common to and connected between said guide arms for swinging the latter apart when said locking means is released, and spring means separate and distinct from said spring for bodily moving said guide arms toward their locked position, said spring means comprising spring-pressed plungers mounted on said guide' arms respectively.

JOHN C. CURTIS.

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