US3306374A

US3306374A - Polar positioning device for rock drills

Info

Publication number: US3306374A
Application number: US416783A
Authority: US
Inventors: Stromnes Axel
Original assignee: Atlas Copco AB
Current assignee: Atlas Copco AB
Priority date: 1964-04-23
Filing date: 1964-12-08
Publication date: 1967-02-28
Anticipated expiration: 1984-02-28
Also published as: CH453260A; AT264422B; FI43575B; DE1458633B2; DE1458633A1; DE1458633C3

Description

A. sTROMNEs POLAR POSITIONING DEVICE FOR ROCK DRILLS Feb. 28, 1967 4 Sheets-Sheet 1 Filed Dec. 8, 1964 INVENTOR. A'XEL STR'nms;

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m q v Feb. 28, 1967 A. STROMNES 3,306,374

POLAR POSITIONING DEVICE FOR ROCK DRILLS Filed Dec. 8, 1964 4 Sheets-Sheet 2 INVENTQR. Xi L 'SKRSM we 5 MMW'X A. STROMNES 3,306,374

POLAR POSITIONING DEVICE FOR ROCK DRILLS 4 Sheets-Sheet 5 R @w i A- w wvmiwv W? L 63 T 1 Feb. 28, 1967 Filed Dec. 8, 1964 m & .m\ w M? M w w k 1 9 5% E $10. RM. M4 mi A) m\ Db \Hv H mm G W NM m v NW Av d em Q WW w$ T E Q Q 1 it sh C a n //C A 1 w mm in QV QQ Feb. 28, 1967 A. STRGMNES 3,306,374

POLAR POSITIONING DEVICE FOR ROCK DRILLS Filed Dec. 8, 1964 4 Sheets-Sheet 4 INVENTOR. AJ 'QL 11 n6 5 4-4 42 BY P79- 6 a United States Patent Ofifice 3,306,374 POLAR POSITIONING DEVICE FOR ROCK DRILLS Axel Sn'timnes, Tunabro, Sweden, assignor to Atlas Copco Aktiebolag, Nacka, Sweden, a corporation of Sweden Filed Dec. 8, 1964, Ser. No. 416,783

Claims priority, application Sweden, Apr. 23, 1964,

5,031/ 64 11 Claims. (Cl. 173-43) The present invention relates generally to mechanized positioning devices for rock drills and more specifically to a positioning device in which a feed shell carrying reciprocaibly a rock drill thereon can be positioned in a fully mechanized way to alternative substantially parallel positions according to a polar coordinate system. This is accomplished by the aid of a link system linking the shell to a base frame which link system upon actuation by suitable power means translates the feed shell to any desired position between a position adjacent said base frame and a position remote therefrom whereby the radius vector in the coordinate system is defined. By also journalling the base frame pivotally and angularly adjustably by power about an axis disposed in a common .plane with the feed shell and the link system, the polar angle in the coordinate system can within certain limits be selected .as desired.

It is the main object of the present invention to provide a highly effective and lightweight polar positioning device of the abovementioned type by applying a link system of a pair of link frames disposed crosswise and pivoted in scissors manner about a central pivot. A further object of the invention is to provide a polar positioning device with crosswise disposed link frames which can be lowered or contracted to bring the feed shell closely adjacent to 'the base frame carrying the link system thereby to minimize the obstructed non-drilling area centrally within the working space of the device.

For the above and other purposes there is according to the invention provided a polar positioning device for rock drills for positioning a rock drill to a plurality of alternative drilling positions according to a polar coordinate system, said positioning device comprising a substructure having coaxial journals thereon spaced in the longitudinal direction thereof, a base frame pivotally mounted on said journals about an axis extending longitudinally of said substructure and defining the polar axis of said coordinate system, an elongated feed shell for longitudinally movably carrying a rock drill thereon having feeding means thereon for feeding and retracting said rock drill along said feed shell, a link system linked between said feed shell and said base frame for translatory motion of said feed shell transversely thereto and to said base frame in a plane including said axis, said link system including a pair of elongated link frames in said plane disposed crosswise and pivoted to one an other in scissors manner about a central pivot, first power means on said substructure and operatively connected to said base frame for defining the angular position of said link frames and feed shell about said axis, and second power means operatively connected to said link frames for moving said link frames and translating said feed shell thereon to the desired position in said plane relative to said base frame thereby to define the radius vector in said polar coordinate system.

The above and other objects of the invention will become obvious from the following description and from the accompanying drawings in which one 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 inside of the channels 21.

of the embodiment described thereinafter may be made within the scope of the claims.

In the drawings, FIG. 1 shows in a perspective view a duplex arrangement of a pair of positioning devices according to the present invention. FIG. 2 shows a side elevational view of the elevated positioning device in FIG. 1. In this view one side wall of the base frame has been removed in order to show underlying parts. FIG. 3 is a side elevational view corresponding to FIG. 2 but showing the positioning device in fully lowered position. FIG. 4 is an enlarged transverse sectional view through the duplex arrangement on the line 4-4 in FIG. 3 and with the two rock drills and their feeding devices removed from the feed shells. FIG. 5 is a fragmental top plan view on the line 55 in FIG. 3. FIG. 6 is a sectional view substantially on the line 6-6 in FIG. 2.

In the drawings 15 designates a substructure such as a welded frame which can be movably supported on wheel axles and wheels, not shown, or can be supported in other ways and on which there is supported a duality of positioning devices according to the present invention. To this end the frame 15 carries on each side thereof upstanding brackets on which two longitudinally spaced coaxial

front journals

16, 16 and a rear journal 17 coaxial therewith are supported. In the journals 16', 16", 17 are pivotally supported two base frames 18 on which a forwardly projecting rod 19 is journalled in the

journals

16, 16" and a rear pivot 20 projects into the rear journal 17. Between the journals 16" and 17 each base frame 18 is elongated and rectangular and has the parallel long sides thereof formed by channel bars 21 facing each other. Angle brackets 22 each carrying a pair of slide blocks 23 on their one limb are reciprocable by means of the slide blocks 23 along and The other downwardly pointing limbs 14 of the angle brackets 22 are interconnected by means of a cross plate 24, FIG. 5, while the outer ends of the horizontal limbs are connected to a transverse pivot 25. A pressure fluid actuated double acting power cylinder 26 is pivoted centrally on the pivot 25 and extends to the rear and is connected at the piston rod end thereof to a pivot 27 fixed to the rear end d the base frame 18. By extension or contraction of the power cylinder 26 the angle brackets 22 together with the pivot 25 obviously can be reciprocated along the base frame 18.

In each of the two positioning devices carried by the substructure 15 two

elongated link frames

28 and 29 each formed by a pair of spaced suitably interconnected elongated frame members, are pivoted to another in scissors manner about a central pivot 30, the intermediate portion of the forwardly pointing link frame 29 pivoting about the central pivot 30 within the intermediate portion of the link frame 28. The lower forward end of each link frame 28 is pivotally journalled in a boss on the outer end of the rod 19 of the base frames 18 by means of a pivot 31 which is carried in the boss pivotally abut immovably in the longitudinal direction of each base frame 18. The lower rear end of each link frame 29 is connected to the above described movable pivot 25.

On the outer ends of thel

ink frames

28, 29 are carried

pivots

32, 33 slidably cooperating respectively with forward and rearward guideways 34', 34" at the opposite ends of a feed shell 35. The guideways 34', 34" preferably consist of parallel angle irons welded to the opposite ends of the feed shell 35 to form longitudinal rails for the

pivots

32, 33. A pressure fluid actuated double acting power cylinder 37 is connected to a pivot 36 fixed to the underside of the feed shell 35, the piston rod end Patented Feb. 28, 1967' of the power cylinder 37 being connected to a pivot 38 affixed to the outer end portion of the link frame 29. The power cylinder 37 keeps the feed shell longitudinally fixed relative to the pivot 33 depending on its state of extension and by extending or contracting of the power cylinder 37 the feed shell 35 obviously can be displaced longitudinally along the

pivots

32, 33 and can be moved towards or against the rock face to be drilled. A rock drill 39 and a drill steel 40 are carried reciprocably by the feed shell 35 which in wellknown manner also carries drill steel centralizers 60, 61 and a feeding device which can be a double-acting feed cylinder 41 movable along the feed bar, for example as disclosed in the US. Patent 3,149,540 or may be made in other Ways. The elements of the feed shell and rock drill are only shown diagrammatically since they and their arrangement are per se well known to those skilled in the art and do not require detailed description.

When the movable pivot 25 on each base frame 18 is reciprocated by means of the power cylinder 26, the

link frames

28, 29, since they are pivoted to one another about the central pivot 30, perform a scissors like movement which elevates or lowers the

pivots

32, 33 and thereby the feed shell 35 with the rock drill 39 thereon so that a suitable elevation for drilling can be adjusted.

In the fully lowered position of FIG. 3 of the

link frames

28, 29 the power cylinder 26 is near its dead center position with respect to the central pivot 30 and when the pivot 25 starts moving the link frame 29 is subjected to large forces. For purposes of decreasing these forces special power means are arranged to impart an initial turning impetus to the

link frames

28, 29 to overcome the dead center position. To this end a power cylinder 42 is connected at the one actuating end thereof to a transverse pivot 43, which is fixed to the downwardly pointing limbs 14 of the angle brackets 22. The other actuating end or piston rod end of the power cylinder 42 is connected to a pivot 44 on a bell crank lever 45 which is pivoted about the movable pivot 25 and carries cross plates 46 which in the inactive position of the power cylinder 42, FIG. 3, are resting on the link frame 29 immediately below the link frame 28. When the

link frames

28, 29 are to be lifted from their fully lowered position in FIG. 3, the

power cylinders

26 and 42 are actuated simultaneously, at which instant the power cylinder 42 turns the bell crank lever 45 upwardly so that the cross plates 46 cause separation of the

link frames

28, 29 and initial turning thereof, whereupon the elevation of the

link frames

28, 29 is completed solely by means of the power cylinder 26.

The base frames 18 are turnable and angularly adjustable about their longitudinal axis by means of pressure fluid actuated power cylinder arrangement which makes possible turning of the base frames 18 through a wide angle while overcoming dead center positions of the actuating cylinders. The arrangement consists of a pair of

power cylinders

47, 48 cooperating with each base frame 18. One end of the

cylinders

47, 48 is pivoted on a longitudinal pivot 49 affixed to the substructure or frame 15. The piston rod ends of the

power cylinders

47, 48 are connected respectively to

pivots

50, 58 on

cranks

51, 59, respectively, which are keyed to the forward rod 19 on suitable angular distances from one another. When one of the power cylinders, for example 47, in the right hand positioning device in FIG. 4 is near its dead center position, the other, 48, obviously can continue the angular adjustment of the base frame 18 through a wide angle.

The forwardly pointing link frame 29 preferably is to such an extent longer than the rearwardly directed link frame 28 that an elevation of the forward end of the feed bar 35 suitable for drilling the roof holes is received when the

link frames

28, 29 are elevated from their fully lowered position in FIG. 3 to the elevated position in FIG. 2.

For purposes of adjusting the roof hole angle the pivot 33 is adjustable as to its height with respect to the link frame 29. To this end the pivot 33 is carried on a bracket 52, FIGS. 1 and 6, which by means of a pivot 53 is pivotally connected to the link frame 29. By means of a bolt 54 which is inserted in a hole in the bracket 52 as well as through one of a number of suitable alternative holes 55 in the link frame 29, the angle between the bracket 52 and the link frame 29 can be set whereby the height of the pivot 33 can be changed relative to the base frame 18.

The pressure fluid for operation of the different power cylinders as well as of the drill is supplied from suitable sources, not illustrated, and the various hoses for conveying pressure fluid have been omitted since they would make the drawings rather congested and since the pro vision of such hoses or conduits is obvious to those skilled in the art.

In operation and assuming the positioning devices to occupy the position depicted in FIG. 3, the two

power cylinders

26, 42 are pressurized to elevate the link frames 28, 29 and the feed shell 35 thereon to the desired height.- During elevation the feed shell 35 is kept fast to link frame 29 by the power cylinder 37 and the pivot 33 remains substantially immovable longitudinally in the guideways 34' relative to the feed shell 35 while the rear pivot 32 slides in the guideways 34". Due hereto and to the selected proportions of the link frames 28, 29 the longitudinal position of the feed shell 35 during elevation or lowering remains substantially unchanged relative to the base frame 18 and the feed shell 35 also remains generally parallel thereto except for the slight angular elevation used for drilling of the roof holes. With the desired elevation set, the

power cylinders

47 and 48 are pressurized to turn the feed shell 35 to the desired angle relative to the longitudinal axis of the base frame 18.- As shown in FIG. 4 the two positioning devices are set to cover adjacent working areas and they enable the holes to be placed according to two polar coordinate systems having their polar axes in the turning axes of the base frames 18. In the systems the radius vector obviously will be defined by the extent of elevation of the feed shells 35 relative to the base frames.

With the shells 35 in the desired position the power cylinders 37 are actuated to move the feed shells 35 to the correct hole starting position adjacent the rock face, whereupon drilling may commence in conventional way.

What I claim is:

1. A polar positioning device for rock drills for positioning a rock drill to a plurality of alternative drilling positions according to a polar coordinate system, said positioning device comprising a substructure having coaxial journals thereon spaced in the longitudinal direction thereof, a base frame pivotally mounted on said journals about an axis extending longitudinally of said substructure and defining the polar axis of said coordinate system, an elongated feed shell for longitudinally movably carrying a rock drill thereon having feeding means thereon for feeding and retracting said rock drill along said feed shell, a link system linked between said feed shell and said base frame for translatory motion of said feed shell transversely thereto and to said base frame in a plane including said axis, said link system including a pair of elongated link frames in said plane disposed crosswise and pivoted to one another in scissors manner about a central pivot, first power means on said substructure and operatively connected to said base frame for defining the angular position of said link frames and feed shell about said axis, and second power means operatively connected to said link frames for moving said link frames and translating said feed shell thereon to the desired position in said plane relative to said base frame thereby to define the radius vector in said polar coordinate system.

2. A positioning device according to claim 1 in which there are provided pivots on the ends of the link frames opposite to the base frame, and guideways on said feed shell cooperating with said pivots for slidably carrying said feed shell in the longitudinal direction thereof on said link frames.

3. A positioning device according to claim 2 in which there are provided separate power means between one of said link frames and said feed shell for moving said feed shell longitudinally on said link frames.

4. A positioning device according to claim 1 in which the portion of one of said link frames adjacent said central pivot is disposed pivotally within the corresponding portion of said other link frame.

5. A polar positioning device for rock drills for positioning a rock drill to a plurality of alternative drilling positions according to a polar coordinate system, said positioning device comprising a substructure having coaxial journals thereon spaced in the longitudinal direction thereof, a base frame pivotally mounted on said journals about an axis extending longitudinally of said substructure and defining the polar axis of said coordinate system, an elongated feed shell for longitudinally movably carrying a rock drill thereon having feeding means thereon for feeding and retracting said rock drill along said feed shell, a link system linked between said feed shell and said base frame for translatory motion of said feed shell transversely thereto and to said base frame in a plane including said axis, said link system including a pair of elongated link frames in said plane disposed crosswise and pivoted to one another in scissors manner about a central pivot, power means on said substructure and operatively connected to said base frame for defining the angular position of said link frames and feed shell about said axis, first pivot means on said base frame for pivotally but longitudinally immovably connecting one of the ends of said link frames remote from said feed shell to said base frame, second pivot means on said base frame for pivotally connecting the other end of said link frames remote from said feed shell to said base frame, means on said base frame providing longitudinal movability of said second pivot means along said base frame, and power means connected between said base frame and said second pivot means for moving said second pivot means longitudinally of said base frame thereby to elevate and to lower said link frames and said feed shell thereon to the desired position relating to said base frame.

6. A polar positioning device for rock drills for positioning a rock drill to a plurality of alternative drilling positions according to a polar coordinate system, said positioning device comprising a substructure having coaxial journals thereon spaced in the longitudinal direction thereof, a base frame pivotally mounted on said journals about an axis extending longitudinally of said substructure and defining the polar axis of said coordinate system, an elongated feed shell for longitudinally movably carrying a rock drill thereon having feeding means thereon for feeding and retracting said rock drill along said feed shell, a link system linked between said feed shell and said base frame for translatory motion of said feed shell transversely thereto and to said base frame in a plane including said axis and substantially without change in the relative longitudinal position between said shell and frame, said link system including a pair of elongated link frames disposed crosswise and pivoted to one another in scissors manner about a central pivot, said link frames carrying pivots at the opposed erid portions thereof, longitudinal guideways on said shell and said base frame for slidably receiving one of said pivots on different link frames respectively, means for keeping the other pivots pivotally but longitudinally fixedly journalled on respectively said shell and said base frame, power means on said substructure and operatively connected to said base frame for defining the angular position of said feed shell about said axis, and a pressure fluid actuated power cylinder connected between said base frame and the movable pivot on said base frame for moving said movable pivot longitudinally of said base frame thereby to elevate or to lower the link frames and the feed shell thereon to the desired position relative to said base frame.

7. A positioning device according to claim 6 in which a separate pressure fluid actuated power cylinder is provided on said base frame, bracket means connecting one actuating end of said separate power cylinder to said movable pivot for movement in unison therewith, and means connected to the other actuating end of said power cylinder for imparting an initial elevating impetus to said link frames in the lowered position thereof.

8. A positioning device according to claim 7 in which said imparting means is a bell crank lever pivotally mounted on said movable pivot of said base frame and having its arm opposite to said separate power cylinder engageable with the link frame carrying said longitudinally fixed pivot of said base frame.

9. A positioning device as set forth in claim 6 in which there are provided separate longitudinal guideways on said feed shell cooperating with the longitudinally fixed pivot thereof for permitting sliding motion of said feed shell relative thereto, and an additional pressure fluid actuated power cylinder connected between said feed shell and the link frame carrying said longitudinally fixed pivot for adjusting the fixed position thereof relative to said feed shell.

10. A positioning device according to claim 6 in which said link frame carrying the longitudinally fixed pivot of said feed shell is provided wit-h means for adjusting the distance of said fixed pivot to said base frame independently of the adjustability of said link frames.

11. A positioning device according to claim 6 in which the link frame carrying said longitudinally fixed pivot of said shell projects forwardly with respect to the drilling direction and is to such an extent longer than the rearwardly pointing link frame that an elevation of the front end of the feed shell is received suitable for drilling of the roof holes when said feed shell is near its greatest distance from said base frame.

References Cited. by the Examiner UNITED STATES PATENTS 1,138,715 5/1915 Young 74-521 2,168,905 8/1939 Lear 17342 2,624,535 1/ 1953 Bollhoefer 24823 2,703,222 3/ 1955 Feucht 17343 2,731,235 1/1956 Dellner 173-43 3,055,648 9/1962 Lawrence et al 299-20 FRED C. MATTERN, JR., Primary Examiner. L. P. KESSLER, Assistant Examiner.

Claims

1. A POLAR POSITIONING DEVICE FOR ROCK DRILLS FOR POSITIONING A ROCK DRILL TO A PLURALITY OF ALTERNATIVE DRILLING POSITIONS ACCORDING TO A POLAR COORDINATE SYSTEM, SAID POSITIONING DEVICE COMPRISING A SUBSTRUCTURE HAVING COAXIAL JOURNALS THEREON SPACED IN THE LONGITUDINAL DIRECTION THEREOF, A BASE FRAME PIVOTALLY MOUNTED ON SAID JOURNALS ABOUT AN AXIS EXTENDING LONGITUDINALLY OF SAID SUBSTRUCTURE AND DEFINING THE POLAR AXIS OF SAID COORDINATE SYSTEM, AN ELONGATED FEED SHELL FOR LONGITUDINALLY MOVABLY CARRYING A ROCK DRILL THEREON HAVING FEEDING MEANS THEREON FOR FEEDING AND RETRACTING SAID ROCK DRILL ALONG SAID FEED SHELL, A LINK SYSTEM LINKED BETWEEN SAID FEED SHELL AND SAID BASE FRAME FOR TRANSLATORY MOTION OF SAID FEED SHELL TRANSVERSELY THERETO AND TO SAID BASE FRAME IN A PLANE INCLUDING SAID AXIS SAID LINK SYSTEM INCLUDING A PAIR OF ELONGATED LINK FRAMES IN SAID PLANE DISPOSED CROSSWISE AND PIVOTED TO ONE ANOTHER IN SCISSORS MANNER ABOUT A CENTRAL PIVOT, FIRST POWER MEANS ON SAID SUBSTRUCTURE AND OPERATIVELY CONNECTED TO SAID BASE FRAME FOR DEFINING THE ANGULAR POSITION OF SAID LINK FRAMES AND FEED SHELL ABOUT SAID AXIS, AND SECOND POWER MEANS OPERATIVELY CONNECTED TO SAID LINK FRAMES FOR MOVING SAID LINK FRAMES AND TRANSLATING SAID FEED SHELL THEREON TO THE DESIRED POSITION IN SAID PLANE RELATIVE TO SAID BASE FRAME THEREBY TO DEFINE THE RADIUS VECTOR IN SAID POLAR COORDINATE SYSTEM.