US2365685A - Drill steel guide - Google Patents

Description

Dec. 26, 1944. Q F OSGOQD 2,365,685

DRILL STEEL GUIDE Filed Feb. 1'7, 1942 3 Sheets-Sheet l Dec. 26, 1944. Q F, OSGQQ@ 2,365,685

DRILL STEEL GUIDE vFiled Feb. 17. 1942 5 Sheets-Sheet 2 Dec. 26, 1944.

Filed Feb. 17. 1942 c.- F. osGooD l2,365,685 DRILL STEEL GUID-E 5 sheets-sheet s' Patented Dec. 26, 1944 DRILL STEEL GUIDE Charles F. Osgood, Claremont, N. H., assignor to Sullivan Machinery Company, a corporation of Massachusetts Application February 17, 1942, Serial No.431,250

13 Claims.

This invention relates torock drills, and more particularly to improvements in a drill steel guide especially designed for use With a mounted rock drill of the drifter type.

In mounted rockV drills of the drifterA type, the drill hammer motor is slidably guide-d in the guideways of a guide shell, and there is usually provided some sort of drill steel guide or cen-v tralizer at the forward end of the guide shell for centering the drill steel actuated by the hammer motor during starting or "spottin-g of a drill hole. In-such drill steel guides or centralizers, the guide is ofttimes automatically released from guiding relation with the drill steel as the drill hammer motor is fed forwardly along the shell guideways, and various devices have been devised to eilect such automatic release. Also in such guides or centralizers a pair of pivoted guide arms are frequently employedto embrace the body of the drill steel; and'these guide arms, when they are automatically swung outwardly into non-guiding position as the hammer motor approaches the guide, project laterally a substantial distance beyond the sides of the guide shell in order to clear the hammer motor to enable the latter to move forwardly beyond the guide. Suchlateral .projection of the guide 4arms beyond the sides of the guide shell is foundto be undesirable, particularly in the restricted quarters in an underground mine. In other types of guiding orcentralizing devices Which did not employ pivoted guide arms, While lateral compactness was obtained the desired -guiding of the drill steel was lacking.

An object of the present invention is to provide an improved drill steel guide or centralizer which, to a large extent, overcomes the disadvantages of certain previous devices. provide an improved drill steel guide having novel mounting means for the guiding elements thereof whereby the latter when released from guiding relation with the drill steel, are maintained Within the lateral limits of the guide shell. Still another object is to provide an improved drill steel guide embodying a pair of cooperatingguide -arms which are pivotally mounted to swing about as the latter is fed forwardly along the shell guidevvays. Yet another object ,is to provide a Another object is to novel drill steel guide having improved locking means for holding the guide in'guiding relation with the drill steel, and which is automatically released upon engagement lthereof by the ldrill hammer motor as the latter is fed forwardly along the shell guidevvays. Yet `another object is to provide a novel drill steel guide having improved locking means for holding the guide in guidingr relation with the drill steel and novel means for automatically moving the guide into non-guiding positioniwhen the locking means is released. A still further object is to provide an improved drill steel guide embodying a novel spring arrangement for automatically moving rthe lguide arms into vtheir noneguiding position when released from their guiding relation with the drill steel. Yet another object is to provide an improved drill lsteel guide having a novel arrangement and combination of parts. Other and further objects and their resultant advantages will be apparent after the invention becomes better understood from an examination of the specirock drill and steel guide shown in Figs. 1 and 2,

showing the guide arms in their later-ally released position.

Fig. 4 is a view similar to Fig. l, with parts shown invertical section, with the `guide in its non-guiding position.

Fig. 5 is a cross sectional View taken substantially on lirici-5 of Fig. 1.

Fig. 6 is a horizontal sectional view taken substantially on line 6-6 of Fig. 1. i l, I

Fig. 7 is a View in longitudinal vertical section taken substantially on line l-'l of Fig. 2. l

Fig. Sis a detail horizontal sectional view taken substantially on line 8-8 of Fig. 1.

Fig.` 9 is a fragmentary side elevational view, similar to Fig. 1, illustrating another embodiment of the invention.

Fig. 10 is a front end elevational view of the rock drill and steel guide shown in Fig. 9.

Fig. 11 is a View similar to Fig. 10,y showing the guide arms in their laterally released position.

Fig. 12 is a view similar to Fig. 9, with .parts shown in longitudinal vertical section, illustrating the guide in its non-guiding position.

Fig. 13 is a cross sectional view taken substantially on line I3--I 3 of Fig. 9.

Fig. 14 is a horizontal sectional View taken substantially on line I4--I4 of Fig. 9.

Fig. 15 is a detail view'in longitudinal vertical section taken substantially on line I -I5 of Fig. 10.

Fig. 16 is a fragmentary side e1evationa1 view ofr:

a rock drill with which still another illustrative embodiment of the invention is associated.

Fig. 17 is a front end elevationalview, with:

parts in vertical section, of'--'the-f-rock drilland steel guide shown in Fig. 16.

Fig. 18 is a front end elevational .view'otheY rock drill and steel guide shown in Fig. 16 with the guide arms in their laterally releasedv 'posi` tion.

guide in itsl non-guiding position... Y

Fig. 20 is7 a crosssectional, View. takensubsta'n. tially. on line 20`2Il-o Fig` .16;

Fig.` 21 is a .horizontal.sectionalviewtalmn,subel stantially on.line 2 Ir-Zll of.Fig.;16.`

Innthe severalembodiments of the. invention. the improved. drill steel; guide is shown associated with f atconventional. hammer.. rock .drill l of. .the

the improveddrill; steel guide may..be .associated .1

The. .hammer rock ydrill disclosed hereinin the.. several. embodimentsV of; the. inventioncomp'rises a .conventional drill. hammer.. motor. I. islidalblyn guided 0n.. a conventional.. guidesheII.. 2,` thelatter..

adapted to f bemounted .on a .conventional dr'll` support. Thef drill-.hammer motor .comprises a.. motor cylinder V3 Acontaining a reciprocatory ham.

mer piston (not shown). .-for. .percussiyely'I actuat. ing -.a drill. steel .4, the,` latter being,.,supported in a usualf chuck Vwithin1 airont. .chuck Vhousing .5 l".

suitablyattached .toxthe frontendof .the motor cylinder. The hamme-rmotor cylinder. hasusual lateral guides 6, 6 slidingly receivedwithin-.longitudinal guideways .1, 'IV of.K the yguide .shelll The hammer motor. .may be -fed alongthev shell. guideways in any ,conventiona1...manner. rock drill disclosed is of a conventionaldesign and is well knownto thoseskilledin the art; further description and .illustration thereof. are here.-

in unnecessary. f

In theembodiment ofthe invention shown-in Figs. 1 to 8, inclusive.` theimproveddrillifsteel.

guide or centralizer, 1 generally Vdesignated \.8.,`.com.. prises a bracket 9 attached by bolts I0, ,whichherein may be the-usual shell sidebolts, tothe Fig..l9 is a:view similar .to Fig..1.6.3'sh/owing..thev

Since .the

` motor, so that the latter ,maybe fed forwardly front end. of the guide-shell.. This. bracket. has. a

forwardly located lug Il provided vwith..a..tra ns., verse bore I2 through-whicha.pivnt.bolt' I3 passes.

Pivotally mounted on the projectingfends .of .'the.v

pivot bolt-I3 are arm:sinriports..I4,l AL4 fon .which are pivotally mounted fon..v parallel pivot bo1t`s|5 a pairof guide arms |6,`;I6.... The axesof the vpivot bolts I5',.- I5`are arrangedrat. right angles. to .the axis ofy the pivot. bolt I3,.'s'oI thattheguidearms may swing into and. outof their. guidingrelatio'n.. with the. drill steel. about rectangularly` related pivotal axes.. These guidearms. have guidingportions I'I appropriately shaped to^engage...the body of the drill steel to hold thelaltt'erl centered' dur.- ing starting,or-.Spottirigf.'of 'a holelinthelmanner Awellkr'iowr'i. to .those..ski1led jin'. the art. The

guide arms have projectinglugsl'f.' lnear their. pivots, and these lugs `are engageable at vI9 with" the outer sides of the arm supports I4 for lmiting lateral swinging movement of thel guide arms about the pivot bolts I5. The arm supports I4 have depending lugs 2U engageable at 2| with the bottom of the bracket 9 for limiting downward swinging of the arm supports and guide arms' l'tion." Tlleitorsionl springs 23 serve to swing the guide arms 'a slighty distance apart sufcient to cleary the sides of-thedrill steel body while the torsion springs 22 act to swing the arm supports I41to move-the guide arms forwardly and downwardly out of the path of Amovementof the drill hammer motor.4 Pivotallymounted ona transverse pivot pin 24 onthe upper side of the bracket 9 is a spring-pressed latch 25 havinganappropriately. shaped locking'portion 26 engageable with -25' lugsA 211integral Vwiththe guide. .arms I6, I6 for locking the guide arms. in, guiding relation with the drill steel. This latchih'as an upper cam .suiv face 28 adapted. to be .engaged by the forward endof. the chuck housing. 5'oi the drill Lhammer. motor as the. latter isA .fedforwardly `along `the shellguideways. so that .the .latch is depressed to eifectreleaserof.theguide prior vto engagement of the hammer motor witlithe guide, arms. When thislatch released vfrom .the arm4 lugs. 21," the torsion springs 23 automatically swingthe guide arms Aaboutitheir.parallel pivots into their laterally released. positionas shown inv Fig. 3,' and thereafter the torsion. springs 22 automatically.`v

swingtheguide arms forwardly. and. downwardly about the transverse pivotinto. their. non-guiding positionshownin. Fig. 4.' When the guide arms are in the position. shown. in Fig.; 4,. they are disposed out of the pathof movement of the hammer along the shellguideways .past the. guide.

In the. operation of this embodiment of the irnproved drill steel guide', whensit is desired to. start or. spot a drill hole. the. guide arms I6,` I6 mayl be swung upwardly` about the transverse pivot" bolt. I3-into the position shown inFig,v 1, and thereafter'. swung inwardly about the pivot bolts I5 into guiding relation with, the drill steel as shown in Fig. 2. As the. guidear-ms are swung,v

into guiding relation .with the drill steel,` the latch, 25 snaps over thev lockinglugs 21 on the guide arms to lock the latter in position., As the drill hammer motor is ,fed forwardlyalong the shell guideways, the .guide arms serve to center the drillste'el.. and whenthe front chuck" housing 5 engages the cam surface28 'on the latch the latter. is depressedfto effect .release of' the locking lug 26 from the lugsl21 on the guide arms. When the latch'is in. its, released position. and the. guide. arms are unlocked, the torsionsprings,A 23 act automatically to vswingtl'ie guide. arms apart into their laterally .released position shown in Fig. 3, sufciently to clearthe. sidesof the steel body, and thereafter the torsion springs 22 actvto swing the arm supports I4 about the transverse pivot to move the 'guide' arms into the:

non-guiding positionshownj invFig. 4out of the. path of movement, of the drill hammer motor.'

As the guide arms swing 'apart laterally;v the lugs" I8 thereon move into; engagement with the outer surfaces lof the arm'r supports; therebyto4 limit" outward swinging movement ofthe arms; and as` the arm supports swing downwardly, downward movement of the guide arms is limited by engagement of the support lugs 20 with the bottom of thebracket 9. By the provision of separate and `distinct pivotal mountings for the guide anrns, the latter may be individually placed in' guiding relation withthe drill steel, for instance, during spotting of a drill hole on an inclined face when but a single arm suices to prevent lateral deflection ofthe drill steel." y l lIn the embodiment of the invention shown `in Figs. 9 to 15, inclusive, a bracket 30, attached to the front end of the guide shell 2, hasforwardly projecting,`laterally spaced lugs 3l, 3l'

provided with alined openings through which a. transverse pivot bolt 32 passes A pair of guide arms 33, 33 have their hubs 34 arranged between the bracket lugs in the manner shown in Fig. 13,

and, are pivotally mounted on the pivot bolt l32` the bracket lugs are coiled torsion springs' 39A which constantly urge the guide arms forwardly and downwardly about thepivot bolt axis. The arm hubs have depending boss-es 40 formed with bores 4I in which spring-pressed `plungers 42 are arranged. These plungers engage the. surfaces of arcuate bearing portions 43 integral with the bracket lugs, as shown in Fig. 15; These plungers constantly tend to rock the guide arms toward their laterally released position shown in Fig. 11, and cooperate with the bracket lugs in limiting downward swinging movement of the arms. Pivoted on a transverse pivot pin`44 on the upper part of the bracket is a spring-pressed latch 45 having an appropriately shaped locking lug 46 engageable with lugs 41, 41 integral with the guide arms. This latch holds the guide arms 1 in their guiding positionishown in Fig. 10, and

is formed with a cam surface 48 adapted to be engaged by the forward end of the chuck housing as the hammer motor is fed forwardly along the shell guideways. When the latch is released from the arm lugs 41, the spring-pressedv plungers 42 automatically vswing the guide arms apart into their laterally released position, 'and thereafter the torsion springs 39 act automatically to swing the guide arms forwardly and downwardly about the pivot bolt 32 into their nonguiding position shown in Fig. l2, out ofthe path of movement of the hammer motor.

The mode of operation of this embodiment of the invention is similar to that above described. When the hammer motor is fed forwardly along the shell guideways, the front chuck housing 5 engages the cam surface 48 on the latch depressing the latter and releasing the locking lug 46 from the locking lugs 41 on the rguide arms. When the latch is in released position, the springpressed plungers 42 throw the guide arms apart into their laterally released position shown in Fig. 11, so that guiding portions thereof just l clear the sides of the body of the drill steel. The torsion springs 39 then act automatically to swing the guide arms forwardly and downwardly about the pivot bolt 32 into their non-guiding pivoty bolt 52 passes.

position shown in Fig. 12, out of the path of movement of the hammer motor. Likewise, as in the other form of the invention above described, by the provision of they separate arm mountings, theguide arms may be placed either separately or simultaneously in guiding relation with the drill steel.

In the embodiment of the invention shown in Figs. 16 to 2l, inclusive, a bracket 5B, attached to the front end of the guide shell 2, has laterally spaced, forwardly located lugs 5I, 5I provided with alined openings through which a transverse Pivotally mounted on this pivot bolt between the bracket lugs is an arm support 53 which carries parallel pivot bolts 54,

54 on which a pair of cooperating guide arms 55,`

55 are pivotally mounted. The axes of the pivot bolts 54 are arranged at right angles to the axis of the transverse pivot bolt 52, so that the guide arms swing into and out of guiding relation with the drill steel about rectangularly related pivotal axes. Arranged within suitable recesses 56 in the opposite sides of the arm support 53 and surrounding the pivot bolt 52 are coiled torsion springs 51, 51 which constantly urge the arm support, together with the guide arms, forwardly and downwardly about the axis of the pivot bolt 52. Suitable means is provided for urging the guide arms constantly apart, i. e. towards their laterally released position, and for normally maintaining them with their guiding portions just clearing the sides of the drill steel body. For

` this lateral urging, I have shown a spring arrangement disclosed in acopending application of one J. C. Curtis, Serial No. 447,016, led June 15 1942. said arrangementincluding a torsion spring 58 with coiled portions 59 surrounding the pivot bolts. The guide armshave lugs 6l] near their pivots, and these lugs are engageable with the outer sides of the arm support 53 for limiting lateral swinging movement of the guide arms, and the arm support 53 has a lug 6l engageable with the bottom of the bracket for limiting downward swinging movement of the guide arms. The guide arms have at their inner sides integral lugs 62 and G3, and the former lug has a longitudinal bore 64 in which a locking bolt 65 is slidingly guided. This locking bolt has an appropriately shaped locking lug 66 engageable with a projection 61 on the lug 63 for holding the arms together in guiding relation with the drill steel. A coil spring 68 urges the locking bolt rearwardly into its lockingr position. Also integral with the rear sides ofthe guide arms are lugs 69 engageable with projections 10 integral with the bracket for holding the guide arms, when the latter are in guiding relation with the drill steel, from swinging forwardly and downwardly about the axis of the pivot bolt 52. t

As in the embodiments of the invention above y described, when the drill hammer motor is fed `automatically to swing the guide arms forwardly vcir-:the path` ormovement; of the. drill-hammer motor.

torsion springs precludes this.

In the several embodiments of the invention above described, it is the intention` initially' to effect'swinging of the arms apart about-,the arm pivot axes into their.l laterally released position, so that the guiding portions. thereof just Aclear the sides of the body of the drill steel, and thereafter to swing the. arms forwardly and downwardly about-theright angle axis' into their non-guiding position.A By thusV first swinging the arms a slight distance apartthe guiding portion of the arms will` clear the steel before the arms start to swing downwardly. By moving theV arms apart only a distance suicient to clear the sides ofthe 'drill steel body, undesirable lateral projection of the guide arms beyond the sides of the guide shell is eliminated. In the embodiment of the inventionlast. described, the guide arms are positively locked against downward swinging movement by the arm locking lugs engaging projections on the bracket,V andpin the rst and second embodiments-.similar` positive locking means maybe employed?. For instance, inthe second embodiment, `above described, the arm hubs and bracket. lugsimay have: suitable interengaging locking portions Vwhich are released as the arms rockapart. Also; the torsion springs may beso designed as to assure swinging of the arms apart prior-tothe: forward and downward swinging movement of. .the arms.

As a result of .this invention it will. be noted that an improved drillsteel guide or centralizer is. provided whichisextremely rugged and compact in construction and simple in design. It willfurther be evident that by they provision of theA improved pivotal'. mountingr for the guide arms, enabling the: latter to swing' about rectangularly related` pivotal axes rin' the-manner disclosed, excessive lateral projection ofthe guide.

arms beyond the sides of the guide shell is elim; inated. Furthermore, by the provision of the particular arm locking arrangement and the spring means for automatically' moving the arms intoA their non-guidingposition; jamming of the parts by'inadvertentw engagement of; the drill hammer motorwith the-guide is prevented, and the lguide is quickly thrown into 'non-guiding position just as soonzas the lock is released irre- Inr this embodimentof: the invention, 1t isrnotpossible-to fplace :separately ithe. guide armsi iny guiding relation: with;Y the drill steel, 'since the particular construction of the locking bolt and..

andvdownwardlyi,-iabout-zthe `pivot `bolt 52 into;` their noneguiding, position-shown.- in; Fig. 19 out,

parallel planes,^ extending .-iniparallelism .with` the --i drill.` steel.

2: Ina-drill steel guide, a pair of cooperating,l relatively; movable guide elements adaptedto en.-4V 1 gage a drill steel, and means for pivotally mount-- ing said guide elements both for swinging move-v ment about-rectangularlyvj related axes, certain. ofsaidpivotal axes-.being disposed parallel tothe longitudinal-.axis ofthe drill `steelwhen said guide--y elements are-in `steel guiding position whereby said guide elementsmay initially swing outwardly-v relative to each other away from' the drill steel,

and: the remainder of f said rectangularly related axes'disposed `at; right angles to said parallel axes.- whereby said guideuelements may. swingdown-.- Wardly- -into an -.outof -the-way non-guidingv .po-

, sition..

3..In^a drillsteel: guide,

parallel axes, said-parallel axes, when the guide.

isin-guiding position, lying. in a plane extending-- in parallelism with the drill steel, and a support.` swingable Aabout a transverse axis at rightang-les. to said armlpivot axes, said arms being pivotally mountedon said pivoted support and swingable with thelatter about said transverse axis.

4.- In a drill steel guide,.apairof cooperating,

relatively movable .guide elements ,movable into.- positions in and outl -of guiding relation witha.

drillA steel, and mountingmeans for said guide elements, said mounting-'means-including,means for. supporting said guidetelements for movement` in aplurality of directions whereby said guide,- elements are. initially movable on said mounting meansra slight-distance apartout of. steel. guiding relation in` transverseplanes perpendicular to the ,longitudinal axis of theY drill steelsuflicientlyto clear. the sidesv of the.. drill steel and.

thereafter movableonsaid mountingr means for-4 wardly. and .downwardly in planes in parallelism with the :drill steel intotheirV non-guiding position.`v

5. In a,drill steel guide, a pair of cooperating,

l-relativelymovable guide elements movable into spective of the supported position of the drill.

Other uses and advantages of the invention will bey clearly apparent to those skilled in the art. Whilev there are inthis application specifically described several embodiments which the invention may assume in practice, it will'be understood that these embodiments of the same are shown for purposes of illustration and that the invention may be further modified andv embodied in various other forms without departing from its spirit' or the scope offthe appended claims.

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

l. In a drill steel guide, a pair of cooperating, relatively movable guide elements adapted to engage a drill steel, and means for pivotally mounting said guide elements-bothfor-swinging movement about rectangularly related axes, said axes; when the-guide is` in guiding' position, lying in positions Yin and out of guiding relation with 'a drill steel, and pivotal mounting means for said axis of the drill steel, and,f0r swinging move ment also about a right angle axis whereby said guide elements are initiallyswingable on said -mounting means relative to each other out of steel guiding relation about axes parallel to the longitudinal axis of the drill. steel. a slight distance apart suicient to clearv the .sides of the drill steel and thereafter swingable on said mounting means about an axis disposed at right angles-to said pivotal axes forwardly and downwardly into their non-guiding'position.v

6.A In a rockdrill,` 4a guide along which a drill,

- lsteel actuator isV guided for movement, a bracket `ontheforward end of said guide, a pair of4 cooperating guide arms movable relative to each other into positions in and out of guiding` relatron with a `drill steel, means vfor pivotally mount ing said guide' arms on said bracket to swing rel- !ative' thereto about rectangularly related axes,r and releasable means on said bracket for locking said guide arms in ltheir steel V,guiding position,

said locking-'means being releasable Ato free said arms ror'movement out' of' guiding relation withv the-drillsteel', saidrdrill steel actuator as it'moves` a pair. of cooperatingpivotedwguide .arms adaptedV to engage a drill` steel, ssaidarms.- being relatively swingableabout.

forwardly along said guide being engageable with an element of said locking means for eiecting release thereof, said guide arms being rst swingable about certain of said axes a slight distance apart suflicient to clear the drill steel and thereafter swingable about a right angle axis in a for--` ward and downward direction into vtheir nonguiding position out of the path of said drill steel actuator.

'7. In a drill steel guide, a pair of cooperating, relatively movable guide arms movable into positions in and out of guiding relation with a drill steel, and separate pivotal mountings for said guide arms each providing rectangularly related pivotal axes, said arms being swingab-le independently about said rectangularly. related axes into and out of guiding relation with the drill steel.

8. In a drillsteel guide, guiding means including a guide element movable into positions in and out of guiding relation with a drill steel, and mounting means for said-guiding means including means for pivotally mounting said guide element to swing from its guiding position in one direction about anaxis disposed parallel to the longitudinal axis of the drill steel and in a different direction about a right angle axis.

9. In a drill steel guide, a pair of4 guiding elements movable relative to each other into positions in and out of guiding relation with a drill steel, andmeans for mounting said guiding .elements eachfor swinging movement in diierent directions at right'angles relative to each other one of which is in transverse planes perpendicular to the longitudinal axis of the drill steel, said guiding elements being movable rst in one direction and thereafter in a right angle direction.

10. In a drill steel guide, a guiding element movable into positions in and out of guiding relation with a drill steel, and means for mounting said guiding element for swinging movement into aforesaid positions, said mounting means including means for supporting said guiding element for swinging in one direction from its guiding position .in transverse planes perpendicular to the longitudinal axis ofthe steel and means for supporting said guiding element for swing- 'ing in another direction in longitudinal planes lparallel to the longitudinal axis of the steel.

11. In a drill steel guide, a support, a pair of guide arms adapted to engage a drill steel and mounted on said support for independent swinging movement toward and from the drill steel about parallel axes arranged at the opposite sides of said support, and a lock on said support and movable into and out of locking relation with said arms -for holding said arms in guiding relation with the steel, said lock being engageable with said arms independently whereby said arms may be individually or simultaneously locked in guiding position.

12. In a drill steel guide, a support, a pair of guide arms adapted to engage a drill steel and l mounted on said support for independent swinging movement toward and from the drill steel about parallel axes arranged at the opposite sides of said support, a lock on said support and movable into and out of locking relationwith said arms for holding said arms in guiding relation with the steel, said lock being engageable with said arms independently whereby said arms may Abe individually or simultaneously locked in guiding position, and means for automatically throwing said guide arms apart into their laterally released position when said lock is in released posispect to said parallel axes and makes a right

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