US2648523A - Drill steel guide - Google Patents

Description

Aug. l1, 1953 c. FfoscsooD DRILL STEEL GUIDE Aug. l1, 1953 c. F. osGooD DRILL STEEL GUIDE 2 sheets-sheet 2 Original Filed June l2, 1944 Patented Aug. Il, 1953 DRILL STEEL GUIDE Charles F. Osgood, Claremont, N. H., assignor to .loy Manufacturing Company, a corporation of Pennsylvania Continuation oi' application Serial No. 539,832, June 12, 1944. This application June 18, 1947,

Serial No. 755,427

20 Claims. l

This invention relates to roclr drills and more particularly vto improvements in a guide for the drill steel of a mounted rock. drill.

In mounted rock drills, the drilling .motor which actuates the drill steel is usually mounted on the guideways of a guide shell, and the latter is, in turn, suitably supported with respect to the work. In such rock drills, a guide or centraliser is usually provided at the front end of the guide shell for centering the drill steel during `starting of a drill hole, and means is usually 'provided for automatically releasing the guide from the drill steel when the drilling motor appreaches the guide so that the forward portion of the drilling motor may be fed along the shell Aguideways forwardly past the guide. Frequently, release of the guide is eiiected by direct contact by the forward end of the drilling motor therewith. ln known devices, the steel guide is positively locked in guiding position, and, when the locking means is released by engagement of the drilling motor therewith, the guide is moved out of guiding relation with the drill steel into a position out of the path of movement of the drilling motor by torsion springs or the like.

In a preferred embodiment of the present invention, the steel guiding elements of the guide may be mounted on a support for lateral swinging movement into and out of guiding relation with a drill steel to be guided and for bodily movement in a direction lengthwise oi the drill steel. The guiding elements of the guide may be moved bodily in a longitudinal direction by direct engagement of the forward end of the drilling motor therewith, and, the drilling motor is fed forwardly along the guide shell, the guiding Velements are shoved forwardly. 'li/leans may be provided so that concurrently with and as a result oi such bodily movement of the guiding elements, the latter are positively swung outwardly about their pivots out of guiding relation with the drill steel and into a wide open position wherein the forward portion of the drilling motor may move between the guiding elements forwardly past the guide. in a preferred embodiment, outward swing of the arms, as the latter are moved bodily, may be effected by cams or spirally arranged grooves or slots. The chuck housing of 'the drilling motor may engage the steel engaging portions of the arms to shove the latter forwardly, and, as these steel engaging portions more laterally into contact with the sides oi' the chuck housing, there may be provided supplemental ;orojections on. the arms which move into engagement with the chuck (Cl. Z55-51) housing so that the drilling motor may continue to shove the arms forwardly to effect outward swinging of the arms into a position out of the path of the drilling motor. In another embodiment, the nal outward swinging movement of the arms may be effected by supplemental cam means under the action of compression springs so that, as the steel engaging portions of the arms move laterally out of contact with the sides of the chuck housing, the springs may move automatically the arms into their wide open position wholly independently of any engagement of the arms with the drilling motor. The cam means may assume various forms, and in different embodiments may consist of cam grooves or slots or separate projecting cam portions with Which the arms cooperate, and the cams may be arranged at the arm pivots or intermediate the arm pivots. Also, outward swing oi the arms, as the latter are moved bodily, may be positively effected by means other than cams, and it is intended to include, within the scope of the present invention, any means for effecting concurrent bodily 'and pivotal movements of the arm wherein the pivotal movement is effected vas a result of the bodily movement. In such constructions, it is unnecessary to provide torsion springs, or the like, for Swinging the arms apart.

It is an object of the present invention to provide an improved drill steel guide wherein the guiding elements thereof may be moved bodily by direct engagement of the drilling motor with the guiding elements as the motor is fed forwardly along its guide shell, together with means for positively swinging the guiding elements laterally out of guiding relation with the drill steel concurrently with and as a result of such bodily movement of the guiding elements. Another object is to provide an improved drill steel guide having improved means for swinging the guiding elements laterally away from the drill steel as the guiding elements are moved bodily Vin a longitudinal direction. A further object is to provide an improved drill steel guide wherein the lateral movement of the guiding elements away from the drill steel occurs as a result of bodily movement of the guiding elements in a direction lengthwise of the drill steel. A still further object is to provide an improved drill steel guide including guide arms mounted for bodily and pivotal movements on a support and having associated therewith improved cam means whereby, as the arms are moved bodily, they are concurrently swung laterally. A still further object is to provide an improved drill steel guide having improved means for effecting initial or partial releasing movement of the guiding elements laterally away from the drill steel and having improved supplemental means for thereafter effecting final or complete movement of the guide arms into their wide open, non-guiding position. A further object is to provide an improved drill steel guide of a novel design and construction. These and other objects and advantages of the invention will, however, more fully appear.

This application is a continuation of my application, Serial No. 539,832, filed June 12, 1944, now abandoned.

In the accompanying drawings there are shown for purposes of illustration two forms which the invention may assume in practice.

In these drawings:

Fig. 1 is a fragmentary side elevational view of a rock drill with which an illustrative embodiment of the drill steel guide is associated.

Fig. 2 is a front end elevational view of the rock drill and steel guide shown in Fig. 1, the drill steel being shown in cross section.

Fig. 3 is a cross-sectional view taken substantially on line 3--3 of Fig. l, showing the drill steel guide in its guiding position.

Fig. 4 is a sectional view, similar to Fig. 3, showing the drill steel guide in its released, nonguiding position.

Fig. 5 is a horizontal sectional view taken substantially on line 5 5 of Fig. 1.

Fig. 6 illustrates one of the cam slots shown in Fig. 5, on an enlarged scale.

Fig. 7 is a fragmentary side elevational view, similar to Fig. 1, illustrating a rock drill equipped with a drill steel guide of modified construction.

Fig. 8 is a front end elevational view of the rock drill and drill steel guide shown in Fig. 7, the drill steel being shown in cross section.

Fig. 9 is a cross-sectional view taken substantially on line 9 9 of Fig. 7, showing the drill steel guide in its guiding position.

Fig. 10 is a sectional view, similar to Fig. 9, showing a drill steel guide in its released nonguiding position.

Fig. 11 is a horizontal sectional view taken substantially on line II-I I of Fig. 7.

Fig. 12 is a detail view, illustrating one of the cam slots shown in Fig. l1 on an enlarged scale.

In both illustrative embodiments of the invention, the improved drill steel guide is shown associated with a conventional rock drill of the mounted drifter type. It will be evident, however, that the invention may be embodied in tools of other types.

The rock drill disclosed herein comprises a conventional drilling motor or drill steel actuator I slidably guided on a conventional guide shell 2. The drilling motor has a motor cylinder 3 containing a reciprocable hammer piston for percussively actuating a drill steel 4, the latter carrying a usual drill bit 5 and being suitably supported in a usual chuck within a front kchuck housing 6, suitably attached to the forward end of the motor cylinder. The motor cylinder has usual lateral guides 'I, 'I slidingly received in longitudinal guideways 8, 8 of the guide shell. The drilling motor may be fed in any well known manner along the shell guideways toward and from the work by any suitable means. Since, as above stated, 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.

In the embodiment shown in Figs. 1 to 6 inelusive, the drill steel guide is generally designated Ill and comprises front and rear transverse plates II and I2 attached, as by parallel, longitudinal bolts I3, to the front end of the guide shell 2. These plates II, I2 are held in spaced relation by spacing sleeves I4 surrounding the bolts intermediate the plates, and these sleeves are suitably secured against rotation relative to the plates. Pivotally mounted on the spacing sleeves are the hubs I5 of a pair of guide arms I6, and each of the latter has an appropriately shaped steel engaging portion I'I. The steel engaging portions II, when the guide arms are swung together as shown in Fig. 3, embrace the body of the drill steel 4 to hold the drill bit 5 centered during starting or spotting of a drill hole in a well known manner. The hubs I5 of the guide arms are also mounted on the spacingl sleeves I4 for bodily sliding movement in a longitudinal direction relative to the drill steel. A ny suitable means may be provided for effecting lateral swinging movement of the arms about their pivots concurrently with and as a result of such bodily movement, and preferably may comprise cam-follower pins or other projections Ill formed on screws I9 secured to the arm hubs, and these follower pins are engaged in cam slots or grooves 2D in the spacing sleeves. Encircling the spacing sleeves intermediate the arm hubs and the front plates are relatively light compression springs 2I which constantly urge the arms in a rearward direction. The arm hubs enclose the cam grooves in all positions of bodily movement of the guide arms so that access of dirt to the grooves is substantially prevented. Each cam groove, as shown in Fig. 6, has a straight rearward longitudinal portion 22, a forwardly and outwardly inclined portion 23 and a lateral recess portion 24. The arms are yieldingly held in a rearward guiding position in engagement with the rear plate in guiding relation with the drill steel, as shown in Fig. 3, by the springs 2I, and the pins or projections I3 are, at that time, received in the straight rearward portions 22 of the cam grooves so that the arms are positively locked against outward swinging movement with respect to the drill steel. Vlhen the front chuck housing 6 of the drilling motor engages the rear surfaces of the steel engaging portions Il of the guide arms, the latter are shoved bodily along the spacing sleeves I4 to a forward direction, and the pins I8, as the arms move forwardly, move along the inclined portions 23 of the cam grooves, thereby effecting positive lateral swinging of the arms outwardly away from the drill steel. When the guide arms assume the. partially released position indicated in dotted lines in Fig. 4, at the outer sides of the chuck housing, projections 25, extending inwardly from the arm hubs I5, have moved upwardly into the path of the chuck housing so that, upon continued forward movement of the drilling motor along the shell guideways, the pins I8 are moved to the outer ends of the inclined portions 23 of the cam grooves to effect further swinging of the guide arms into their completely released non-guiding position out of the path of the drilling motor. When the projections 25 have moved outwardly to the sides of the drilling motor as shown in full lines in Fig. 4, the pins I8 are in the right-hand dotted line position shown in Fig. 6 at the outer ends of the cam grooves and in aiinement with the recesses 24, and the compression springs 2l may then move the arms slightly rearwardly along the spacing sleeves with respect to the drilling motor to bring the pins I3 into the locking recesses 2li so that the guide arms are locked in their wide open released position. The recessed ends of the cam grooves also limit outward swing of the arms. When the guide arms are wide apart, as shown in full lines in Fig. 4, the forward portion of the drilling motor may move between the guide arms, forwardly past the guide.

The modified embodiment, shown in Figs. 7 to 12 inclusive, is generally similar to that above described. In this form, however, the arm projections 25 are omitted and the final outward swinging movement of the guide arms to wide open position is eilected automatically by the cams and springs as hereinafter described. In this construction, the transverse plates, attaching bolts and spacing sleeves are similar to those above described. Pivotally mounted on the spacing sleeves are the hubs Sil of a pair of guide arms Si, the latter each having an appropriate- Yly shaped steel engaging` portion 32 adapted to embrace the body of the drill steel to maintain the latter centered during starting of a drill hole. Secured to the arm hubs are screws 33 on which are formed cam-follower pins or projections 34 which project into cam slots or grooves 35. As in the other embodiment, the arm hubs enclose the cam grooves in all position of bodily movement of the arm so that dirt cannot enter the grooves. Encircling the spacing sleeves intermediate the arm hubs and the front plate are relatively light coil compression springs 35. As shown in Fig. l2, each of the cam grooves has a straight rearward longitudinal portion 3l, a forwardly and outwardly inclined portion 3S, and a rearwardly inclined portion 39. The arms are held in a rearward position, shown in Fig. 9, against the rear plate in guiding relation with the drill steel, by the springs 3@ with the iollower pins or projections .it received in the straight rearward portions 3l of the cam grooves so that the arms are at that time positively locked against outward swinging movement with respect to the drill steel. When the front chuck housing or the drilling motor engages the rear surfaces of the steel engaging portions 32 of the guide arms and the latter are shoved bodily in a forward direction along the spacing sleeves, the

follower pins move along the forwardly inclined portions 3S of the cam grooves, thereby eirecting lateral swinging of the arms away from the drill steel. When the arms assume the partially released dotted line position shown in Fig. lil at the outer sides of the chucl: housing, the pins 315i are in the right-hand dotted line position shown in Fig. l2 at the outer ends of the inclined groove portions 3S, and the arms are then free to :nove rearwardly relative to the chuck housing under the influence of the coil springs 3d and the pins Si, as the arms move rearwardly, engage the rearwardly inclined portions oi the earn grooves to effect further lateral swinging of the arms into their completely released non-guiding position out or the path oi the drilling motor, shown full lines in l0. Accordingly, the iinal outward swinging movement of the guide arms from the position indicated in dotted lines in Fig. l0 to the full line position in that figure is effected independently of the drilling motor by the coil springs Bil and rearwardly inclined cam portions to. The ends oi the portions oi the cam slots lock the arms in their released position and serve to limit outward swing of the arms.

The general mode of operation of the embodiment of the drill steel guide, shown in Figs. 1 to 6 inclusive, Ais as follows: When it is desired to start or spot a drill hole, the guide arms i6 may be moved manually slightly forwardly and then inwardly about their pivots to release the pins lil from the locking recesses 24 and thereafter the guide arms maybe shoved inwardly and rearwardly into steel guiding position, as shown in Figs. 1 and 3, with the pins i8 received in the vstraight ,rearward portions 22 of the cam grooves so that at that time the arms are positively .locked against outward swinging movement. As the drilling motor is fed forwardly along the shell guideways 8, 8, the front chuck housing 6 engages the rear surfaces oi the steel engaging portions i1 of the guide arms and, upon continued forward movement of the drilling motor, the guide arms are shoved forwardly bodily along the spacing sleeves to effect release of the pins I8 from the straight rearward portions v22 of the cam grooves and to move the pins forwardly along the inclined portions 23 oi the cam grooves to swing the guide arms laterally from the position shown in Fig. 3 to the partial- Yly released dotted line position shown in Fig. 4.

As the steel engaging portions il of the guide arms move laterally to the sides oi the chuck housing, the projections 25 on the guide arms Ymove into the path of the chuck housing so that the drilling motor, as it continues to move forwardly, moves the pins i8 further outwardly along the inclined portions 23 of the cam grooves, to swing the arms further into their completely eleased non-guiding position, as shown in full lines in 4. When the projections 25 are positioned laterally at the sides oi the drilling motor, the springs El move the arm hubs a slight distance rearwardly along the spacing sleeves to bring the pins vi8 into the locking recesses 2li so that the guide arms are locked in their wide open position. When the guide arms are in their wide open position, the drilling motor may move between the guide arms forwardly in advance of the guide. Under certain conditions, the guide arms may be separately placed in guiding relation with the drill steel so that but a single guide arm may serve as a guide, as for instance, during spotting of a drill hole on an inclined working race when but a single guide arm will suffice to prevent lateral deliection of the drill bit.

The mode or operation of the modied invention, shown in Figs. 7 to 12 inclusive, is generally similar to that above described in that, as the arms are moved forwardly bodily, they are concurrently swung outwardly out of guiding relation with the drill steel. In this instance, however, when the iront chuck housing of the drilling motor engages the steel engaging portions 32 of the guide arms and shoves the guide arms forwardly bodily along the spacing sleeves, the pins 363 move forwardly out of the straight rearward portions 3l of the cam grooves and thereafter move along the inclined groove portions 38 to effect swinging of the guide arms laterally away from the drill steel to the partially released position indicated in dotted lines in Fig. 10. When the steel engaging portions 32 of the arms move laterally to the sides of the chuck housing, the coil springs 36 act to move the guide arms bodily rearwardly to bring the pins 3d into contact with the rearwardly inclined portions 39 of the cam grooves to complete the outward swing-ing of the arms from the dotted line position shown in Fig. 1f) to the wide open, non-guiding position shown in full lines in that figure. It is accordingly evident that the final swinging movement of the arms toward wide open position is effected by the cam grooves and coil springs wholly independently of the movement of the drilling motor along the shell guideways. When the pins 34 are positioned at the outer ends of the rearwardly inclined portions 39 of the cam grooves, the guide arms are locked in their wide open, released position so that the forward portion of the drilling motor may move between the guide arms forwardly in advance of the guide. When it is desired to move the guide arms inwardly into guiding relation with the drill steel, the operator may manually move the arms forwardly and inwardly to move the pins 34 out of the groove portions 39 into the groove portions 38, and thereafter the arms' may be moved rearwardly and inwardly into guiding relation with the drill Steel. When the pins 34 are received in the straight rearward portions 31 of the cam grooves, the arms are locked against outward swinging movement from their steel guiding position.

As a result of this invention, it will be noted that an improved drill steel guide is provided wherein, when the arms are moved bodily in a direction lengthwise of the drill steel, they are concurrently positively swung outwardly out of guiding relation with the drill steel. It will further be evident that by the provision of the improved cam means associated with the guide arms, the latter, as they are moved bodily in a forward direction, are positively swung outwardly about their pivots out of guiding relation with the drill steel. In one embodiment, the guide arms are moved out of guiding relation with the drill steel into their wide open, released position completely by direct engagement of the forward end of the drilling motor with the guide arms, while, in the other embodiment, initial lateral swinging movement of the guide arms is effected by the drilling motor and the final outward swinging movement of the guide arms is effected wholly independently of the drilling motor. In both embodiments, the improved drill steel guide is relatively simple and compact, and may be readily attached to a conventional guide shell with little or no mbdification. Other uses and advantages of the invention will be clearly apparent to those skilled in the art.

While there are in this application specifically described two forms which the invention may assume in practice, it will -be understood that these forms of the same are 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:

l. In a rock drill of the kind which includes a support along which a drill steel actuator is guided for movement toward the work, a drill steel guide carried by said support at the front end thereof and including a guide arm engageable with a drill steel to be guided, pivot providing and guiding means on said support for mounting said arm for pivotal movement about an axis parallel to the longitudinal axis of the drill steel into and out of guiding relation with the steel and for guided bodily movement in the direction of the axial line of the pivot lengthwise of the drill steel, said actuator as it moves forwardly along said support acting on said arm to effect forward bodily movement thereof along said guiding means, and arm swinging means for swinging said arm laterally about its pivotal axis away from the drill steel as said arm moves forwardly bodily along said guiding means, said swinging means comprising cooperating swingeffecting elements respectively on said guiding means and said arm and having relative movement for imparting a lateral swinging force to said arm to swing the latter outwardly as the result of such forward guided bodily movement of said arm, and said arm having spaced lateral portions successively engageable by said actuator as the latter moves forwardly, said actuator first engaging one arm portion to move said arm bodily to effect swinging of said arm outwardly about its pivot to effect partial lateral release of said arm from the steel and said other arm portion moving, upon partial release of said arm as aforesaid, into the path of said actuator as said first portion moves out of the path of said actuator, to effect by engagement with said latter portion further outward swinging of said arm about its pivot thereby completely to release said arm from the steel.

2. In a rock drill of the kind having a support along which a drill steel actuator is guided for movement toward the work, a drill steel guide carried by said support at the front end thereof and including a guide arm having a portion engageable with a drill steel to be guided, pivot providing and guiding means on said support for mounting said arm for pivotal movement about a longitudinal axis parallel to the longitudinal axis of the drill steel and for guiding said arm for bodily movement along a straight path in the direction of the axial line of the pivot lengthwise of the drill steel, said actuator as it moves forwardly along said support rst engaging said arm-portion to effect bodily movement of said arm as aforesaid along said guiding means, and arm swinging means associated with said guiding means and coacting with said arm whereby the latter as it is moved bodily along said guiding means is swung outwardly about its pivot away from the drill steel to move said arm-portion laterally out of the path of said actuator, said arm having a lateral projection spaced from said steel engaging portion and swingable with said arm whereby when said arm has swung into its partially released position and said steel engaging portion thereof has moved out of the path of said actuator said projection has moved into the path of said actuator then, and said actuator engaging said projection to swing said arm about its pivot completely into its fully released position wherein said projection is located out of the actuator path at the side of the actuator.

3. In a rock drill of the kind having a support along which a drill steel actuator is guided for movement toward the work, a drill steel guide carried at the front end of said support and including a guiding element engageable with the drill steel to be guided, movement permitting and guiding means on said support for mounting said guiding element for lateral movement in transverse planes into and out of guiding relation with the drill steel and for guiding said element for bodily movement along a straight path in a direction lengthwise of the drill steel, said actuator as it moves forwardly along said support engaging said guiding element to move the latter bodily along said guiding means, arm swinging means associated with said guiding means and coacting with said guiding element and including coatrasos operating swing-eiecting elements, one on. said guiding means and the other on said guidingk element, for moving said guiding elementlaterally on its mounting` means away from the drill steel, as said guiding element moves bodily along said guiding means in one direction, laterally into a partially released position, and means operative when said guiding element has moved into its partially released positionv and operating independently of movement of said actuator for completing the movement of said guiding element laterally along its mounting means into its. completely released non-guiding. position out ofA the path of said actuator, saidlast mentioned means moving said guiding element bodily along its guiding means to complete such lateral releasa of said guiding element.

4. In a drill steel guide, a guiding element engageable with a drill steel toA be guided, mov-ement permitting and guiding meansformounting said guiding element for lateral movement inf transverse planes into and out of guiding relation' with the drill steel and for guiding said element for bodily movement successively in opposite directions along a straight path extending lengthwise of the drill steel, means associated with-said guiding means andl c'oacting with said guiding element and including cooperating elements having relative movement, one on said guiding means and the other on said guiding element, for moving said guiding element laterally away from the drillsteel as said element movesV bodily in one direction along said guide means thereby to move saidelement into its partially released position, andi guiding element moving means also associated-l with said guiding means and coacting with one of" said moving-elements for moving said guidingl element laterally on said mounting means intoV its completely released non-guiding position asv said guiding element moves bodily along said guiding means in the oppositeY direction.

5. In a drill steel guide, a guiding element en-v gageable with a drill steel to'be guided, movement permitting andv guiding means for mounting said guiding element for lateral movement in transverse planes into and out of guiding relation with" the drill steel and for guiding said element for bodily movement along a straight path successively in opposite directions lengthwise of the drill steel, moving means for said guiding element associated with said guiding means and coacting with said guiding element and including cooperating elements having relative movement, one` 6. In a drill steel guide, a support, a pair ofY cooperating guide arms engageable with a drill steel to be guided, pivot providing and guiding means on said support for mounting said guide arms for relative pivotal movement about longitudinal axes parallel to the longitudinal axis of the drill steel into and out of guiding relation with the drill steel, said' guiding means guiding said arms for bodily moveemnt along straight` paths lengthwise of the drill steel, said arms having cam-engaging projections near the pivots thereof, and cams associated with said guiding means and having cam surfaces withwhich said projections respectively engage for swinging said arms outwardly about their pivots away from the drill steel as said arms concurrently move bodily along said guiding means, said cam-engaging projections moving along said cam surfaces as saidv arms move bodily as aforesaid.

7. In a drill steel guide, a guiding element engageable with a drill steel to be guided, movement permitting and guiding means for mounting said guiding element for relative lateral movement in transverse planes in opposite directiohs into and out of guiding relation with the drill steel and for guiding said element for bodily movement along astraight path successively in oppositeI directions lengthwise of the drill steel, movement-effecting means associated with said guiding means and coacting with said guiding element andv including cooperating elements having relative movement, one onsaid guiding means and the other on said guiding element, for moving said guiding element laterally on said mounting means out of guiding relation with the drill steel as said guiding element moves bodily in aA forward direction along said guiding means, and locking means thereafter effective as said guiding element moves bodily in the rearward direction along said guiding means and cooperating with one of said cooperating elementsr for moving said guiding element for locking the latter in-i'ts outermost released'non-guiding position.

3. In a drill steel guide, a guide arm engageable with a drill steel to be guided, a pivot providing and guiding means for pivotally mounting said guide arm to swing in transverse planes about an axis parallel to the longitudinal axis of the drill steel into and out of guiding relation with the drill steel and for guiding said arm for bodily movement in thel direction lengthwise of the drill steel, and armswinging means cooperating with said guidingmeans and with said arm andv including cooperating arm swinging elements having relative movement, one on said' guiding means and the other on said arm, for swinging said arm outwardly about its pivot away from the drill steel as said arm moves bodily along said guiding means, and saidV mounting and guiding means maintaining the arm pivot parallel to the longitudinal axis of the drill steel during such swingingand bodily movementsof said arm.

9. In a drill steel guide, the combination comprising afsupport, a guiding element engageable witha drill steel to be guided, movement permitting and guiding means on said support for mountingA said' guiding element for lateral movementinY transverse planes intov and out of guiding relationl with the' drill steel and for guiding said? guiding element for bodily movement along a straight path in a direction lengthwise of the drill steel, and movement-effecting means cooperating with said guiding means and with said guiding element for moving the latter laterally on said mounting means out of guiding relation with the drill steel as said guiding element concurrently moves bodily along said guiding means, said last mentioned means including cooperatingV cam andv follower elements respectively on said guiding means andk on said guiding element and having relativev sliding movement as said guiding element movesbodily to'impart a lateral movement. to said guiding element.

l0. In a drill steel guide, the4 combination Comprising a support, a guide arm engageable with a drill steel to be guided, pivot providing and guiding means for mounting said guide arm on said support for pivotal movement in transverse planes about an axis extending longitudinally of said support into and out of guiding relation with the drill steel and for guided bodily movement along a straight path in a longitudinal direction lengthwise of the drill steel, and means cooperating with said mounting means and said guide arm and including cooperating swing-effecting elements having relative movement, one on said guiding means and the other on said arm, for swinging said arm outwardly about its pivot relative to the drill steel as said arm moves bodily on said mounting means.

l1. In a drill steel guide, the combination comprising a support, a guide arm engageable with a drill steel to be guided, pivot providing and guiding means for mounting said guide arm on said support for pivotal movement about an axis extending longitudinally of said support into and out of guiding relation with the drill steel and for guided bodily movement along a straight path in a longitudinal direction lengthwise of the drill steel, and arm swinging means cooperating with said mounting means and said guide arm and including cooperating swing-effecting elements for swinging said arm outwardly about its pivot relative to the drill steel as said arm moves bodily on said guiding means, one of said cooperating swing-effecting elements being movable bodily with said arm and said other element being stationary with respect to said guiding means whereby upon bodily movement of said arm said elements have relative movement to impart a swinging force to said arm.

12. In a drill steel guide, the combination comprising a support, a guide arm engageable with a drill steel to be guided, pivot providing and guiding means for mounting said guide arm on said support for pivotal movement about an axis extending longitudinally of said support into and out of guiding relation with the drill steel and for bodily movement along a straight path lengthwise of the drill steel, and arm swinging means connected to said mounting means and to said arm and including cooperating swingeffecting elements for swinging said arm outwardly about its pivot relative to the drill steel as said arm moves bodily along its guiding means, one of said swinging elements comprising a cam stationary with respect to said guiding means and the other element constituting a cam engaging element movable bodily with said arm, said cam having a cam surface along which said cam engaging element moves during bodily movement of said arm to effect swinging of the latter.

13. In a drill steel guide, the combination comprising a support, a pair of coaoting guide arms engageable with a drill steel to be guided, pivot providing and guiding means for mounting said arms on said support for relative swinging movement relative to said support about parallel axes extending longitudinally of said support toward and from the drill steel and for bodily movement longitudinally of said support in the direction in which said pivotal axes extend, and swing-eiiecting means connected to said guiding means and to said arms respectively and including cooperating arm swing-effecting elements, having relative movement, one on said guiding means and the other on said arm, for swinging said arms outwardly about their pivots relative to the drill steel as said arms move bodily along said guiding means.

14. In a drill steel guide, the combination comprising a support, a guiding element engageable with a drill steel to be guided, movement permitting and guiding means for mounting said guiding element on said support for movement in transverse planes laterally into and out of guiding relation with the drill steel and for rectilinear bodily movement in a direction lengthwise of the drill steel, moving means for said guiding element cooperating with said guiding means and said guiding element for moving the latter laterally outwardly into a partially released position with respect to the drill steel as said guiding element moves bodily along its mounting means, and movement-effecting means separate from aforesaid lateral moving means and operative only when said guiding element has moved into its partially released position for automatically moving said guiding element laterally outwardly to its fully released non-guiding position as said guiding element continues to move bodily along its guiding means.

15. In a rock drill of the kind having a support along which a drill steel actuator is guided for` movement toward a work, a drill steel guide carried by said support at the front end thereof and including a guide arm engageable with a drill steel to be guided, pivot providing and guiding means for mounting said guide arm on said support for pivotal movement in transverse planes into and out of guiding relation with the drill steel and for rectilinear bodily movement in a direction lengthwise of the drill steel, said actuator as it moves forwardly along said support engaging said arm to move the latter bodily in a forward direction on said guiding means, and arm swinging means connected to said guiding means and to said arm for swinging said arm outwardly about its pivot away from the drill steel as said arm moves in a forward direction bodily on its mounting means, said arm swinging means including cooperating arm swing-effecting elements, one on said guiding means and the other on said arm, having relative movement as said arm moves forwardly bodily as aforesaid.

16. In a drill steel guide, the combination comprising a support, a guide arm engageable with a drill steel to be guided, pivot providing and guiding means for mounting said arm on said support for swinging movement relative thereto about a longitudinal axis parallel with the longitudinal axis of the drill steel toward and from the drill steel and for guiding said arm for rectilinear bodily movement longitudinally relative to said support in the direction in which said pivotal axis extends, and arm swinging means connected to said mounting means and to said arm and including cooperating arm swing-effecting elements having relative movement, one on said guiding means and the other on said arm, for swinging said arm outwardly about its pivot relative to the drill steel as said arm moves bodily along said guiding means.

17. In a drill steel guide, the combination comprising a support, a pair of cooperating guide arms engageable with a drill steel to be guided, pivot providing and guiding means for mounting said arms on said support for relative pivotal movement about axes extending longitudinally of said support in parallelism with the longitudinal axis of the drill steel and for bodily movement along straight paths in the direction of said pivotal axes, and means on said guiding means providing cam surfaces and cam-follower projections on said arms each engageable with and movable relative to the cam surfaces on one of said guiding means whereby when said arms are moved bodily in a forward direction along said guiding means said arms are concurrently swung outwardly about their pivots away from the drill steel.

18. In a drill steel guide, the combination comprising a support, a pair of cooperating guide arms engageable with a drill steel to be guided, pivot providing and guiding means for mounting said arms on said support for relative pivotal movement about axes extending longitudinally of said support in parallelism with the longitudinal axis of the drill steel and for guided bodily movement along straight paths in the direction of said pivotal axes, means on said guiding means providing relatively inclined, oppositely extending, connected cam surfaces and cam-follower projections on said arms respectively having sliding engagement with said cam surfaces whereby when said arms are moved bodily in a forward direction along said guiding means said follower projections move along certain of said cam surfaces to swing said arms outwardly relative to the drill steel into a partially released position, and springs on said pivot providing and guiding means and acting on said arms and effective when said arms are in their partially released position as aforesaid to move said arms bodily in the rearward direction on said guiding means thereby to move said camfollower projections along the others of said cam surfaces to further swing said arms outwardly A relative to the drill steel into their completely released, non-guiding position.

19. In a drill steel guide, a support member, a pair of cooperating guide arms engageable with a drill steel to be guided, pivotal mounting means on said support member including parallel support elements secured to said support member for mounting said guide arms for swinging movement about longitudinal axes parallel to the longitudinal axis of the drill steel into and out of guiding relation with the drill steel, said pivotal mounting means including said parallel support elements for guiding said arms for bodily movement along straight paths lengthwise of the drill steel, said arms having cam follower members near the pivots thereof, and cam tracks on said parallel support elements and having cam surfaces with which said cam follower elements respectively engage for eiecting swinging of said arms outwardly about their pivots away from the drill steel as said arms move bodily along said support elements, said cam follower elements moving along said cam surfaces of said cam tracks as said arms move bodily as aforesaid.

20. In a drill steel guide, a support member, a pair of cooperating guide arms engageable with a drill steel to be guided, mounting means on said support member for said guide arms including parallel support elements on which said guide arms are pivotally mounted for swinging movement about longitudinal axes parallel to the axis of the drill steel and slidably mounted for bodily movement lengthwise of the drill steel, and means for effecting swinging of said arms outwardly about said longitudinal axes away from said drill steel as said arms move bodily along said support elements in a direction forwardly longitudinally of the drill steel including cam follower members and cam tracks engaged by said follower members connecting said arms and said parallel support elements and imposing on said arms swinging movement about said axes during their forward longitudinal movement aforesaid.

CHARLES F. OSGOOD.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,141,716 Hulshizer Dec. 27, 1938 2,350,658 Curtis June 6, 1944 2,365,686 Osgood Dec. 26, 1944 2,365,687 Curtis 1 Dec. 26, 1944

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