US2365684A

US2365684A - Rock drill

Info

Publication number: US2365684A
Application number: US411284A
Authority: US
Inventors: Elmer G Gartin
Original assignee: Sullivan Machinery Co
Current assignee: Sullivan Machinery Co
Priority date: 1941-09-18
Filing date: 1941-09-18
Publication date: 1944-12-26
Anticipated expiration: 1961-12-26

Description

Dec. 26, 1944. E. G. ARTIN 2,365,684

ROCK DRILL FiledSept. 18, 1941 Patented Dec. 26, 1944 ROCK DRILL Elmer G. Gartin, Claremont, N. H., assignor to Sullivan Machinery Company, a corporation of Massachusetts Application September 18, 1941, Serial No. 411,284

16 Claims. ("Cl. Z55-51) This invention relates to rock drills, and more particularly to improvements in a guide for the drill steel of a hammer rock drill.

An object oi this invention is to provide an improved drill steel guide. Another object is to provide an improved drill steel guide having improved mounting means for the guiding clef ments thereof. A further object is to provide an improved drill steel guide of the pivoted arm type having improved pivotal mounting means for the guide arms. A still further obje-ct is to provide an improved pivotal mounting means for the guide arms of a drill steel guide whereby the guide arms may be swung through a relatively wide range. Yet another object is to provide an improved pivotal mounting means for the guide arms of a drill steel guide whereby the guide arms may be swung into their released non-guiding position in such manner that the lateral projection of the guide arms is maintained at a minimum. `With the above and other objects in view, this invention relates to certain novel features of construction, operation and arrangement of parts, an example of which is Fig. 4 is across sectional View taken substantially on line 4 4 of Fig. 1.

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

Fig. 6 is a detail View in longitudinal vertical section taken substantially on line 6-6 of Fig. 2.

In this illustrative construction the improved drill steel guide, generally designated l, is shown associated with a conventional hammer 4rock drill of the mounted drifter type. It will be evident, however, that the improved drill steel guide may beassociated with drills of various other types.

The hammer rock drill comprises a conventional drill hammer motor 2 slidably guided on a conventional guide support 3 commonly known as a guide shell, adapted to be mounted on a con- .Ventional drill support. The hammer'motor has a motor cylinder 4 Icontaining a usual reciprocatory hammer piston (not shown) for percussively actuating a drill steel 5, the latter being supported in a usual chuck within a front chuck housing 6 suitably attached to the front end oi the motor cylinder.` The hammer motor cylinder has lateral guides 1, l slidingly received within

longitudinal guideways

8, 8 of the guide shell. The hammer motor may be fed along the shell guideways, in a well known manner, by means of a conventional feed screw engaged with a feed nut carried by the motor cylinder, so that when the screw is rotated the motor is fed longitudinally relative -to the shell. Since, as above stated, the rock drill is of a conventional design and is well known to those skilled in the art, further vdescription and illustrationV thereof are unnecessary.

The improved drill steel guide l `comprises transversely arranged rear and front plates il and l0 secured, as by bolts Il, preferably three in number, totheforward end of the guide shell 3, and theseplates are held in proper spaced relation by spacing sleeves I2 interposed between the plates on the bolts. Pivotally mounted on the spacing sleeves on the upper bolts is a pair of cooperating guide arms |3l3 each having an appropriately shaped guiding portion I4. IIhese guide arms are identical in shape and design and are readily interchangeable so that a single forging design serves for both arms, thereby to reduce the cost of manufacture. The guiding portions of these guide arms are adapted to embrace the body of the drill steel 5 to hold the same centered during starting or spotting of a hole, in the manner well known to those lskilled in the art. The hub I5 of the guide arms are slotted at I6. intermediate their ends to receive portions of rotatable elements Il which are likewise pivotally mounted on the spacing sleeves of the upper bolts, and these elements I1 have surfaces I8 engageable with abutment surfaces I9 on the guide arms. Integral with the elements l1 are depending lugs 20, and a torsion spring 2l encircling the spacing sleeve on the lower bolt has its ends respectively connectedfat 22vto these lugs. The guide arms and thevelements l1 are also mounted on the spacing sleeves of the upper bolts for `bodily sliding movement, and the guide arms have rearwardly projecting locking lugs 23 'engageable with locking abutments 24I formed on the rear plate 9. Coil springs 25 vencircling the spacing sleeves on the upper bolts act on the forward surfaces of the guide armsv to urge the latter bodily rearwardly into abutting engagement with the front surface of the rear plate to hold the locking lugs 23 in locking engagement with the locking projections 24, thereby to lock the guide arms in their guiding position. The depending lugs 20- on the members l1 have surfaces 26 engageable with abutment surfaces 21 on the rear plate 9 to limit pivotal movement of the members l1 in one direction. The upper surfaces of the plates 9, I are disposed below the Iplane projections of the bottom surfaces of the shell guideways 8, so that the lateral guides 1 of the drill hammer motor may move forwardly past the plates when the guide arms are in their wide open non-guiding position. The coil springs 25 which hold the guide arms in engagement with the front surface of the rear plate 9, also serve to hold frictionally the guide arms in the dotted line position shown in Fig. 3. In this construction, the rear plate 9 has an integral bearing boss 28 (Fig. 5) providing a journal for the forward bearing portion 29 of the feed screw.

In the operation of the impro-ved drill steel guide, when it is desired to start or spot a drill hole, the guide arms I3 may be lswung .manually about their pivots into theguiding position shown in Fig. 2 with their guiding portions I4 Vin engagement with the drill steel 5, and at that time the guide arms are locked. position by the locking lugs 23 thereon engaging the locking projections 24 on the `rear plate 9. The coil springs 25 yieldingly hold the locking lugs in locking engagement with the locking projections. As the drill hammer motor is fed forwardly along the shell guideways, the front chuck housing B lengages the rear surfaces of the guide arms and 'shoves the guide arms forwardly bodily `along the upper spacing sleeves to effect release of the locking lugs 23 from the locking projections. When the arm lugs are released, the torsion spring 2| acting on the members l-'l which in turn abut the guide arms, automatically swings the guide arms into their released non-guiding position shown in Fig. 3, so that the drill hammer motor can move forwardly between the guide arms without interference therewith. The guide arms may then swing about theirA pivots relative to the then stationary members H from the full line position shown in Fig. 3 to the dotted line position shown in vthat figure, to locate the latter beneath the guide shell, so that the lateral projection of the guide arms is maintained at a minimum. The coil springs 25 hold the guide arms in frictional contact with the rear plate, when the guide arms are in their released non-guidingposition. Under certain conditions the guide Aarms may be individually moved into steel guiding position so that but a single guide arm may serve to vguide the drill steel, for instance during thespotting of a hole 'on langinclined face; and by the provision oT lthe sepa.- rate locking means for/each guide arm, the arms may be individually locked in yguiding position. When the hammer motor is'in its retracted position on the guide shell and it is again desired to place the guide arms in guiding relation with respect to the drill steel, the `arrns'may be manually swung against the tension of the torsion spring 2l into engagement 'with the drill r'steel and then shoved rearwardly to bring thelocking lugs thereon into engagement with vthe locking projections.

As a result oi this invention *it will be noted that an improved `drill steel gui-de 4is provided which is rugged in construction and relatively simple in design. It willalso be Vevident thatby mounting the guide arms lin the manner shown,

feo

the guide arms may be swung not only into their released non-guiding position but may be swung downwardly toward one another beneath the supporting guide, so that the lateral projection of the guide arms is maintained at a minimum. Other uses and advantages of the invention will be clearly apparent to those skilled in the art.

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

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

1. In a drill steel guide, a support, a guiding element pivotally mounted on said support, a member rotatably mounted on said support on an aXis coincident with the pivotal axis of said guide element, said member ybeing engageable with said guide element to effect swinging yof said guide element about its pivot and said guide element being swingable about its pivot relative to said member, and means associated with said member for effecting rotation thereof.

2. In a drill steel guide, a support, a guiding element pivotally mounted on said support to swing into and out of steel guiding position, and a member rotatable relative to said guiding element and engageable with said guiding element to eiiect swinging thereof out of 'its guiding position, said guiding element being swingable relative to said rotatable member out of engagement with the latter. l

3. In a drill steel guide, a support, a guiding element pivotally mounted on said support to swing into and out `o1 steel guiding position, a member rotatable relative to said guiding element and engageable with said guiding element to eiect swinging thereof out of its guiding-posi tion, and a torsion spring for eecting rotation of said member.

4. In a drill steel guide, a support, a guiding element pivotally mounted on said support to swing into and out of steel guiding position, a member rotatable relative to said guiding element and relative to which said guiding element is swingable, said member being engageable with said guiding element to effect swinging thereof out of its guiding position, and means for limiting rotary movement of said member.

5. In a drill steel guide, a support, a. guiding element pivotally mounted on said support to swing into and out of steel guiding position, a member rotatable relative to said guiding element and relative to which said guiding element is swingable, said member being engageable with said guiding element to effect swinging thereof out of its guiding position, means for limiting rotary movement of said member, and constantly acting means for rotating said member and for holding the latter in yielding engagement with said limiting means. V

6. In a drill steel guide, a support, a guiding element mounted on said lsupport for movement into and out of steel guiding position, a member mounted on said support and engageable with said guiding element to effect movement of the latter from one of said positions to the other, and means with which said member is rengageable for limiting movement of said member when said guiding 'element is out of its steel guiding position, said guiding element having additional tion, said guiding velement having additional movement With respect to said member while the latter is held against movement by said limiting means, and resilient means for moving said member and for yieldingly holding the latter in engagement with said limiting means.

8. In a drill steel guide, a support, a guiding element mounted on said support for movement into and out of steel guiding position, a member mounted on said support and engageable with said guiding element to effect movementof the latter from one of said positions to the other, means with which said member is engageable for limiting movement of said member when said guiding element is out of its steel guiding position, said guiding element having additional movement with respect to said member while the latter is held against movement by said limiting means, and means for yieldingly holding said guiding element in its inoperative position.

9. In a drill steel guide, a support, a pair of guide arms pivotally mounted on said support to swing into and out of steel guiding position, rotatable members mounted on said support to turn on axes coincident with the arm pivot axes, said members having engagement with said arms to effect swinging of the latter from. one position to the other, and torsion spring means for rotatin said members.

10. In a drill steel guide, a, support, a, pair of guide arms pivotally mounted on said support to swing into and out of steel guiding position, rotatable members mounted on said support to turn on axes coincident with the arm pivot axes, said members having engagement with said arms 12. In a drill steel guide, a support, a pair' of guide arms pivotally mounted on said support to swing into and out of steel guiding position, rotatable members mounted on said support to turn on axes coincident with the arm pivot axes, said members having abutment surfaces engageable with corresponding surfaces on said arms to swing the latter from one position to the other, Iand means for limiting rotary movement of said members, said armsbeing swingable relative to said members when movement of the latter is lim ited by said limiting means to move said abutto effect swinging ofthe latter from one position to the other, means for limiting rotary movement of said members, and torsion spring means for rotating said members and for yieldingly holding the latter in engagement with said limiting means.

11. In a drill steel guide, a support, a pair of guide arms pivotally mounted on said support `to swing into and out of steel guiding position, rotatable members mounted on said support to turn on axes coincident with the arm pivot axes, said members having engagement with said arms to swing the latter from one position to the other, and means for limiting rotary movement of said members, said arms being swingable relative to said members when movement of the latter is limited by said limiting means.

ting surfaces out of engagement.

13. In a drill steel guide, a support, a pair of guide arms pivotally mounted on said support to swing into and out of steel guiding position, rotatable members mounted on said support to turn on axes coincident with the arm pivot axes, said members having abutmentl surfaces engageable with corresponding surfaces on said arms to swing the latter from one position to the other, means for limiting rotary movement of said members, said arms being swingable relative to said members when movement of the latter is limited by said limiting means to move said abutting surfaces out of engagement, and torsion spring means for rotating said members.

14. In a drill steel guide, a support, a pair of guide arms pivotally mounted on said support to swing into and out of steel guiding position, rotatable members mounted on said support to turn on axes coincident with the arm pivot axes, said members having abutment surfaces engageable with corresponding surfaces on said arms to swing the latter from one position to the other,`

means for limiting rotary movement of said members, said arms being swingable relative to said members when movement of the latter is limited by said limiting means to move said abutting surfaces out of engagement, and means for yieldingly holding said guide arms in their inoperative position.

15. 1n a drill steel guide, a support, a guiding element pivotally mounted on said support to swing relative thereto into and out of steel guiding position, a member rotatable relative to said guiding element and engageable with said guiding element `to elect swinging thereof out of its guiding position, and means for effecting rotative movement of said rotatable member.

16. In a drill steel guide, a support, a guiding element pivotally mounted on said support to swing relative thereto into and out of steel guiding position, a member rotatable relative to saidV guiding element about an raxis coincident with the Vpivotal axis thereof and engageable with said ELMER G. GARTIN.