US3481410A

US3481410A - Adjusting head for drill booms

Info

Publication number: US3481410A
Application number: US709290A
Authority: US
Inventors: Josef Lewkowicz
Original assignee: Atlas Copco AB
Current assignee: Atlas Copco AB
Priority date: 1967-03-10
Filing date: 1968-02-29
Publication date: 1969-12-02
Anticipated expiration: 1986-12-02
Also published as: FR1559281A; GB1215094A; SE315255B; DE1985611U

Description

I Dec. 2, 1969 LEWKOWICZ' 3,481,410

ADJUSTING HEAD FOR DRILL BOOMS Filed Feb. 29, 1968 ,8 INVENTOR.

Fig.1 7 BY B United States Patent /67 Int. Cl. E21c 11/00,- F16m 11/04 US. Cl. 17343 7 Claims ABSTRACT OF THE DISCLOSURE In adjusting heads for drill booms for postioning rock drilling apparatus there is provided alternative right-hand or left-hand mountability of the drilling apparatus on a forked bracket at the outer end of the drill boom. The drilling apparatus is mounted on a feed holder pivotally supported on interconnected primary and secondary pivot axles perpendicular to one another. The primary axle is selectively mountable in the bracket with the secondary axle outwardly on one side or the other of the bracket. A hydraulic power ram for pivoting the feed holder about the secondary axle extends between a pivot point on said primary axle between the fork shanks of the bracket and a pivot point on the feeder holder. Preferably, a hydraulic -,power ram for pivoting the feed holder about the primary axle is mounted within the fork shanks of the bracket pivotally between the drill boom and an arm on the primary axle.

. This invention relates to an adjusting head for drill booms adapted for positioning a rock drilling apparatus to different alternative drilling positions with respect to a work surface. More particularly the invention relates to an adjusting head of the above type wherein said rock drilling apparatus is carried by a feed holder adjustable j-on the one hand by means of a first hydraulic power ram feed holder.

In adjusting heads of the abovementioned character it is often desirable to mount the rock drilling apparatus :in offset relation to the outer end of the drill boom alternatively to the right or to the left thereof in order to gain suflicient versatility in applying the boom system on drill wagons and drill rigs. It is a primary object of the invention to create an adjusting head with such a disposition of the hydraulic power rams and the horizontal and transverse axles thereof that there will be gained convenient alternative right hand or left hand mountability of the feed shell with a set of given parts without the use of extra details whereby construction of individual righthand and left-hand boom heads becomes unnecessary.

in adjusting heads of the type in question the hydraulic power rams are subjected to the risk of collision with surrounding rock or with adjacent drill booms mounted on a common drill wagon or drill rig. A further object of the invention is to :provide an improved journalling and disposition of the hydraulic power rams whereby the hazard of damage by collision will be substantially reduced.

For the above and other purposes there is provided an adjusting head for drill booms adapted for positioning a rock drilling apparatus to different alternative drilling positions with respect to a work surface and comprising 3,481,410 Patented Dec. 2, 1969 a feed holder for carrying said rock drilling apparatus, a dr ll boom, a forked bracket at the outer end of said dr1ll boom and having a pair of shanks thereon, a horizontal axle carried by said shanks and alternatively mountable thereon with the one end portion of the horizontal axle outwardly of one or the other of said shanks for pivotally supporting said feed holder on said horizontal axle selectively to the right or to the left of said bracket, a first hydraulic power ram pivotally connected to said drill boom and to said horizontal axle for adjusting the elevation angle of said feed holder about said horizontal axle, a transverse axle perpendicular to said horizontal axle and connected to said one end portion thereof, a member on said feed holder for supporting the latter pivotally on said transverse axle, and a second hydraulic power ram pivotally connected to said horizontal axle at a point between said shanks and to said feed holder for adjusting the side swing angle of the latter about said transverse axle.

The above and other objects of the invention will become obvious from the following description and from the accompanying drawings in which a preferred embodiment of the invention is illustrated by way of example. It should be understood that this embodiment is only illustrative of the invention and that various modifications thereof may be made within the scope of the claims.

In the drawings FIG. 1 shows an adjusting head according to the invention mounted at the outer end of a drill boom. The adjusting head is shown in top plan view with the feed shell removed from the feed holder. FIG. 2 is a side view of the adjusting head in FIG. 1 with the feed holder removed as well. FIG. 3 is a section on line 3--3 in FIG. 1 and shows in addition thereto and partly in cross section the feed shell and the rock drill in the mounted position thereof on the feed holder. FIG. 4 is a fragmentary view of the feed holder seen on the line 4-4 in FIG. 1.

In FIG. 1 there is shown a forked bracket 10 which with the bottom portion 11 thereof screwed on to a drill boom 12. The drill boom 12 may be adjustable in respect ;of the elevation angle as well as the side swing angle thereof and may be made in any suitable conventional way. The shanks of the forked bracket 10 are provided at the outer ends thereof with coaxial journal bearings 13. In the latter there is pivotally journalled a primary or horizontal axle 14 which in a one-sided manner carries a fork head 15 thereon. The horizontal axle 14 may be journalled alternatively and selectively with the fork head 15 to the right, as shown by full lines in FIG. 1, or to the left as indicated at 15 with broken lines in FIG. 1. The horizontal axle 14 is kept in place between the journal bearings 13 on one hand by the fork head 15 abutting against the outer end of the journal bearing 13 of bracket 10 and disposed adjacent to a bearing surface on the axle 14, and on the other by a flanged journal sleeve 16 mounted on and aflixed by screws to the 0pposite end of the horizontal axle 14 and providing a hearing surface therefor in the adjacent journal bearing 13. A radial arm or segment 17 has a hub portion thereon engaging by a splined connection splines the central part of the horizontal axle 14.

A hydraulic power ram 18 is by means of a pivot 19 pivotally journalled to the base portion 11 of the forked bracket 10 at one side of the shanks thereof whilst the piston rod 20 of the hydraulic ram by means of a connecting pivot 21 may 'be locked pivotally selectively to one of a number of holes 22 in the segment 17 at the other side of said shanks. The shanks of the forked bracket 10 are interconnected by an outwardly bent sheet metal shield 23 which in a protecting manner extends over the hydraulic ram 18 while giving the latter freedom to per- 3 form its maneuvering movements in its position between the shanks of the forked bracket when turning the Segment 17.

The forkhead protruding laterally from the forked bracket 10 is provided with coaxial journals in which a secondary or transverse axle 24 is pivotally supported perpendicular to the horizontal axle 14. To the transverse axle 24 is affixed a fork member 25 which engages into the fork head 15 straddling the upper journal thereof about the transverse axle 24. The forked member 25 forms the rear end portion of a feed holder 26 which is provided with guiding rails 27 bolted thereto in which rock drilling apparatus including a feed shell 28 is slidably guided longitudinally of the feed holder 26. The feed shell 28 carries in conventional manner slidably a rock drill 29 thereon as well as feeding means therefor, not shown, all as usually included in the rock drilling apparatus. To the feed shell 28 is aflixable a clamping bracket 30, FIG. 1, which is carried by the cylinder end of a hydraulic power ram 31 inserted into the interior of the feed holder 26. The piston rod end of the hydraulic ram 31 is fixed to a pivot 32 at the rear end of the fork member 25, FIG. 4. By extension or contraction of the hydraulic ram 31 the feed shell 28 may be adjusted in conventional manner longitudinally with respect to the feed holder 26.

A side flange on the feed holder 26 carries a pivot 33 on which is journalled the piston rod end of a hydraulic power ram 34. The cylinder end of the hydraulic ram 34 is journalled on a pivot 35 carried by the hub of the arm 17 between the journal bearings 13 of the forked bracket 10. The power ram 34 and its

pivots

33, 35 are coplanar with and disposed in the central plane of the feed holder 26. By extension or contraction of the hydraulic ram 34 the feed holder 26 and, together therewith, the feed shell 28 may be pivoted about the transverse axle 24 so that the side swing angle of the feed shell may be adjusted. The elevation angle of the feed shell 28 is adjusted by extension or contraction of the hydraulic ram 18 protected within the forked bracket 10.

The guide rails 27 of the feed shell on the feed holder 26 may be taken off in order to be bolted at holes 36 to the opposite side of the feed holder 26. With such a mounting the feed holder 26, upon disconnection from the fork head 15, FIG. 3, may be turned 180 and again journalled by way of the vertical axle 24 on the fork head 15 upon the latter and the horizontal axle 14 having been turned in the journal bearings 13 of the forked bracket 10 to the position designated by the numeral 15 in FIG. 1. In this alternative position the forked member 25 of the feed holder 26 will again be mounted to straddle the upper one of the journals forming the fork head 15 of the horizontal axle 14 so that the new positions of the feed holder 26, feed shell 28 and rock drill 29 will be level with the previous ones. Without the addition of any extra details there is thus gained selective right hand or left hand mountability of the feed shell 28 with respect to the forked bracket 10 and the drill boom 12.

By disposition of the power ram 34 in a common plane with the feed holder 26 the underside of the feed holder 26 will be free from parts sensitive to deformation. Thus the power ram 34, as well, will be protected to a great extent when the drill boom 12 and the feed holder 26 are laid down to rest on suitable support such as on trestles or on underlying drill booms.

What I claim is:

1. An adjusting head for drill booms adapted to position a rock drilling apparatus to different alternative drilling positions with respect to a work surface and comprising a feed holder for carrying said rock drilling apparatus, a drill boom, a forked bracket at the outer end of the drill boom and having a pair of shanks thereon, a horizontal axle carried by said shanks, said axle having a forked end portion extending laterally of the forked bracket, said axle being alternatively mountable in the bracket to cause said forked end portion to be located outwardly and laterally of one or the other of said shanks for pivotally supporting said feed holder on said horizontal axle selectively to the right or to the left of the bracket, a first hydraulic power ram pivotally connected to the drill boom and to said horizontal axle for adjusting the elevation angle of said feed holder about said horizontal axle, a transverse axle perpendicular to said horizontal axle and connected to said forked end portion thereof, a member on said feed holder for supporting the latter pivotally on said transverse axle, and a second hydraulic power ram pivotally connected to said horizontal axle at a point between said shanks and to said feed holder for adjusting the side swing angle of the latter about said transverse axle.

2. An adjusting head according to claim 1 in which said first power ram is disposed between said shanks and pivotally connected on one hand to the base portion of said bracket and on the other to an arm on said horizontal axle between said shanks.

3. An adjusting head for drill booms adapted for positioning a rock drilling apparatus to different alternative drilling positions with respect to a work surface and comprising a feed holder for carrying said rock drilling apparatus, a drill boom, a forked bracket at the outer end of said drill boom and having a pair of shanks thereon, coaxial journal bearings at the outer ends of said shanks, a primary axle, a secondary axle connected to one end portion of said primary axle and perpendicular thereto, a flanged journal sleeve detachably connected to the other end of said primary axle, bearing surfaces on said primary axle respectively adjacent said one end thereof and on said journal sleeve cooperating with said journal bearings for pivotally supporting said primary axle therein with the flange of said sleeve outwardly of one of said bearing sleeves and said secondary axle outwardly of the other, said primary axle being alternatively mountable in said bearings upon disconnection of said sleeve therefrom with said secondary axle outwardly of one or the other of said shanks, a first hydraulic power ram pivotally connected to said drill boom and to said primary axle for the angular adjustment thereof, a member on said feed holder for supporting the latter pivotally on said secondary axle, and a second hydraulic power ram pivotally connected to said primary axle at a point between said shanks and to said feed holder for the angular adjustment thereof about said secondary axle.

4. An adjusting head according to claim 3 in which said member and said one end portion of said primary axle carrying said secondary axle are forked straddling one another about said secondary axle.

5. An adjusting head for drill booms adapted for positioning a rock drilling apparatus to different alternative positions with respect to a work surface and comprising a feed holder for carrying said rock drilling apparatus, a

drill boom, a forked bracket at the outer end of the drill boom and having a pair of shanks thereon, a primary axle carried by said shanks, Said axle having a forked end for lateral projection from the forked bracket, said primary axle being alternatively mountable in the bracket with its forked end portion projecting outwardly and laterally of one or the other of said shanks for pivotally supporting the feed holder on the primary axle selectively to one side or the other of said bracket, an arm on the primary axle between said shanks and pivotally connected to said drill boom and to said arm for angular adjustment of the feed holder about the primary axle, a secondary axle perpendicular to the primary axle and connected to the forked end portion thereof, a member on the feed holder for supporting the latter pivotally on said secondary axle, and a second hydraulic power rarn pivotally connected to said primary axle at a point between the shanks and to 5 6 said feed holder for adjustment of the latter about the References Cited secmdary axle- UNITED STATES PATENTS 6. An adjusting head according to claim 5 in which the pivotal connection of said first power ram on said drill g l boom is disposed on a base portion of said bracket in 5 313041033 2/1967 gg spz g i opposite relation to said arm With respect to said shanks.

7. An adjusting head according to claim 5 in which ERNEST R PURSER Primar Examiner said shanks at an intermediate portion thereof are intery Connected by a sheet metal shield bent across said first CL hydraulic ram for the protection of the latter. 10 24 1