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Publication numberUS2949280 A
Publication typeGrant
Publication dateAug 16, 1960
Filing dateMay 14, 1957
Priority dateMay 14, 1957
Publication numberUS 2949280 A, US 2949280A, US-A-2949280, US2949280 A, US2949280A
InventorsCurtis John C
Original AssigneeJoy Mfg Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Mobile rock drill rig
US 2949280 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Aug. 16, 1960 J. c. c uRTls MOBILE ROCK DRILLl RIGV Filed May 14, 1957 Moena noon einer. nio

John C. Curtis, Newport, NH., assigner to Joy Manufacturing Company, Pittsburgh, Pa., a corporationof Pennsylvania Filed May`1'4, 1957, Ser. No. 659,158A

12 Claims. {CL Z55- 51) 1956, in which l am a coinventor, now Patent No. l

2,845,251, dated luly 29, 1958, and which is assigned to the same assignee as the present invention. In this copending application spaced crawler tread devices have independently pivoted tread frames and separate drill adjusting means operatively connected to each tread frame and the separate adjusting means are operable in unison for elevating the drilling tool. In the structure of the present invention but a single adjusting device has cooperation through improved connections with both tread frames for adjusting the elevation of the drilling tool. Therefore, the present invention contemplates improvements over the structure of the copending application in that the supporting and elevating sructure for the drilling tool is simplified and is made relatively rugged, durable and less costly in design.

An object of the present invention is to provide an improved mobile rock drill. Another object is to provide an improved rock drill having improved supporting and propelling means and improved elevating means for the drilling tool operatively associated with the supporting and propelling means. A further object is to provide an improved mobile roch drill rig having crawler tread propelling `and steering devices and an improved adjustable supporting structure for a drilling tool operatively connected with the crawler tread frames. A still further object is to provide an improved elevating device for the drilling tool embodying a cross connecting member extending between and universally pivotally connected to the tread frames and having a single elevating device operatively connected to the cross member for elevating the drilling tool. These and other objects and advantages of the invention will, however, hereiuafter more fully appear.

4In the accompanying drawings there is shown for purposes of illustration one embodiment which the invention may assume -in practice.

ln these drawings:

Fig. l is a side elevational view of a mobile rock drill in which an illustrative embodiment of the invention is incorporated.

Fig. 2 is a rear end view of the drill shown in Fig. l, with the upper portion oi the drill guide frame broken away and showing a portion of the improved supporting and elevating means.

Fig. 3 is a fragmentary rear end view showing the vcrawler treads moving over uneven ground, with one tread raised higher than -t-heother.

Patented Aug. 16, 1960 Fig. 4 is a detail vertical section taken on lline 4 4 of Fig. 2.

Fig. 5 is an enlarged detail sec-tion showing one of the universal pivotal connections. v

The mobile rock 4drill rig in which the invention is incorporated generally comprises ya mobile base l on which is -adjus-tably mounted a supporting structure 2 for an elongated drill guide trarne 3 along which a conventional hammer drilling tool 4 is guided for movement longitudinally therealong, all as is fully disclosed in the above mentioned copending application.

The mobile base l is desirably a crawler base adapted to travel over an uneven ground surface and comprising independently tiltable side trames 6 about which endless crawler treads 7 are guided for orbital circulation. Convention-al iluid motors, not shown, carried by the Y tread frames as fully disclosed in the above mentioned v boom frame ll of inverted 'tl-shape Vhaving side arms or legs 12 and an out-er cross connecting portion or bar' A1.3, and pivotaliy mounted on an axis E4 parallel to` the longitudinal axis of the cross bor, on the outer portion of the irmer hoorn frame, is an outer boom frame l5, the latter forming a continuation of the inner boom frame to provide an elongated boom structure, the outer end of which may be adjusted through a relatively wide range in vertical planes with resp-ect to the base. As disclosed in `the copending application above referred to, pivotatlly mounted near the outer portion of the outer boom frame l5, on an axis perpendicular to a line parallel with the boom frame axes ii and 14, is the elongated guide frame 3 along which the drilling tool i is guided. The drilling tool has a conventional pressure tluid type `hammer motor i7 for percussively actuating a drill steel itl carrying a drill bit i9. Conventional huid jacks 2lb and 2l respectively serve to Vswing the outer boom frame l5 about its pivot relative to the inner Vboon". frame and to tilt the guide frame i` laterally about its Vpivot relative to the outer boom frame.

Now referring to the improved supporting and adjusting structure, generally designated 22, between the tread frames and the inner boom frame, it will be noted that extending transversely between the tread frames near one end thereof is a cross connecting frame 23 herein desirably of tubular construction and bent or otherwise formed upwardly to provide side arm portions 24 supporting a raised cross portion 25 thereby to provide 4a frame of inverted 4U-shape. These side arm portions have universal pivotal connections at 26 with brackets 27 suitably secured to or formed at the inner sides of the tread frames, and these universal pivotal connections are desirably in the form of conventional ball and socket pivots each cornprising a ball portion 28 fitted in a spherical socket 29 in the associated bracket. As is Well known in the art there is suicient inherent looseness in the pivotal joints between the several frame parts of a rock drill of the character disclosed to allow for limited relative tilting movement of the tread frames up and down and relative tilt of the transverse frame as the drill rig traverses rough or uneven terrain withou-t undue binding. When one tread frame swings about its pivot in a vertical plane the point of pivotal connection of the cross member with the tread frame will swing in an arc about the point of'pivotalgondesirablyin the form of a conventional double telescopic fluid jack. The pivot 30` allows the fluid -jack to swing laterally. This fluid jack is pivotally connected at 32 at its upper .end to brackets 33 secured to the cross portion 13 of the inner boom frame 11.

The cross connection not only provide a universal pivotal mounting for the centrally located elevating jack but also serves to tie the. tread frames together at points remote from the boom frame pivots 8` so that allV of the Vtorsion load is not carried by the inner U-shaped boom frame. Further, by employing the cross connecting frame and the single centrally located jack any need for a bypass connection for equalizing fluid pressuresV in the cylinders, such as is disclosed in the copending application above referred to, is avoided. Y

As a result of this invention an improved supporting and adjusting structure is provided for a rock drilling tool whereby the latter may -be readily adjusted through a wide range of drilling positions. By the provision of the cross connection between the tread frames the base may travel over an uneven surface without undue distortion. By universally pivotally connecting the cross connecting frame` with the tread frames and extending the single centrally located jack between this cross connection and the adjustable boom mounting for the drilling tool the elevating structure for the tool is not only substantially simplified but is also made more rugged and durable in design.

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 vfor purposes of illustration and that the invention may be modiiied 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: Y

1. In a drilling apparatus, a mobile base having spaced apart side .frames carrying ground engaging means yand mounted for independent ltilting movement in upright planes to permit said ground engaging means to travel over an uneven ground surface and adjustable drill supporting structure, meansy for mounting said side frames for independent tilting movements and said drill supporting structure for adjusting movement in Vertical planes, a cross connecting frame extending between said side frames at a point spaced longitudinally of said base from said mounting means, means for universally pivotally connecting said cross connecting frame at its ends to said side frames whereby the latter may tilt while connectedtransversely by'said crossconnecting frame, and an elevating device connected to said cross. connecting frame and to -said adjustable supporting structure for adjusting theV latter. on its mounting means on said base thereby to Vary the elevation of a drill supported thereby.

2. In a drilling apparatus, a mobile base having spaced apart side frames carrying ground engaging means and i frames, means for universally pivotally connecting'said cross Yconnecting frame'at its ends to said-side frames for 4=--pernt1itting tilt-ingL of the latter vwhile transversely con- ---necting said side frames together, a single elevating device, andmeans for connecting said elevating device to said crossl connecting framerand to vsaid swingable lsupporting structure for swinging the latter on its pivotal mounting on said base thereby to vary the elevation of a drill supported thereby.

3. A drilling apparatus as set forth in claim 2 wherein said cross connecting frame provides a transverse tie connection between said side frames irrespective of the relative tilted positions thereof, and said means for pivotally connecting said elevating device tosaid cross connecting frame engagesthe latter midway between the ends of said connecting frame.

4. A drilling apparatus comprising a mobile base having propelling and steering means including spaced apart side frames having independent relative movement in vertical planes to permit said propelling and steering means to travel over an uneven ground surface, a swingable boom struc-ture for supporting a drilling tool and having spaced side portions, means for pivotally mounting said side frames for independent tilting movements vand said side portions of said drill supportingboom structure for .pivotal ymovement on said side frames whereby .said

boom structure may swing in vertical planesavithrespect to said side frames, a crossconnecting frameextending between said side frames at a point spaced longitudinally of the base from said mounting vmeans for transversely connecting said side frames, means for` universally pivotally connecting said cross connecting frame at its ends with said side frames to permit tilting of the latter while connected transversely by said cross connecting frame, an extensible power device extending between said cross connecting frame and said boom structure, and

means for connecting said power device to said cross connecting frame of said boom s-tructure for swinging the latter in vertical planes on its pivotal mounting on said base .thereby to vary the elevation of a drill supported thereby.

5. A drilling apparatus as set forth in claim 4 wherein said means for connecting said power device to said cross connecting frame is pivotally connected -to the latter at a point located midway between the universal pivotal connections with said side frames.

6. A drilling apparatus comprising a pair-of spaced apart crawler tread devices each having a frame tiltable in upright planes relative to the other to permit said crawler tread devices to travel over an uneven ground surface, an elongated boom structure for supporting a drilling tool comprising an inverted U -shaped boom frame, means for pivotally mounting said boom. frame at its lower portion at the inner sides of said tread frames of said crawler ltread devices, a cross connecting frame structure for transversely connecting said tread frames, means providing universal pivotal connections between said cross Iconnecting frame structure and said .frames of said crawler tread devices at points spacedv longi-tudinally of said devices with respect to the pivotal mountings of said boom frame on said frames of said crawler treaddevices, and adjustable power means connected to Vsaid cross connecting frame structure and to said boom -frame for swinging the latter in vertical planes about its pivot to vary the elevation of the drilling tool supported thereby. j

7. In a drilling apparatus, a mobile base having spaced apart side frames carrying ground engaging means and mounted for independent tilting movement in upright planes to permit said ground engaging means to travel over an uneven ground surface, a swingable drill supporting structure, means for pivotally mounting said drill supporting structure on said side frames with the pivotal axis thereof coincident with the pivotal axes of t-i-lt of said iside frames, said pivotal mounting means also providing the pivotal mounting for said side frames, a cross connecting frame extending between said sideframes at points spaced longitudinally of said -side lframes from-the pivotal mounting for said supporting structure for tying 'said side frames together, means for universally pivotally connecting said cross connecting frame to said side frames to permit tilting of either side frame with respect to the other while said side frames lare tied together transversely by said cross connecting frame, and elevating means Ifor said drill supporting structure connected to said cross connecting frame and to said supporting structure for swinging the latter on its pivotal mounting to vary the elevation of a drill supported thereby.

8. A drilling apparatus as set forth in claim 7 wherein said cross connecting frame is of inverted U-shape to provide` increased clearance between the upper cross portion thereof Vand the ground surface.

9. A drilling Iapparatus comprising a pair of spaced apart crawler tread devices each having a frame tiltable in upright planes relative yto the other to permit said crawler tread devices to travel over an uneven ground surface, an elongated boom structure, means for pivotally mounting said boom structure on said tread frames to swing in vertical planes relative thereto, said pivotal mounting also providing the pivots for said tread frames, a cross connecting frame structure extending between said tread frames for transversely tying the latter together, means for universally pivotally connecting said cross connecting frame structure at its ends with said tread frames at points spaced longitudinally of said tread devices with respect to the pivotal mounting of said boom frame on said tread frames, said cross connecting frame structure tying said tread frames together while permitting independent tilting movement thereof, an extensible power operated means, and means for connecting said power operated means to said cross connecting frame structure and to said boom structure for swinging the latter in vertical planes about its pivot to vary the elevation of a drill supported by said boom structure.

10. A drilling apparatus as set forth in claim 9 wherein said cross connecting frame structure has an elevated transverse upper portion to which said extensible power operated means is connected to provide increased ground clearance, said elevated transverse portion being disposed a substantial distance above the pivotal connections of said cross connecting frame structure with said tread frames.

1l. In a drilling apparatus, a mobile base having spaced apart side frames and ground engaging means carried thereby, said frames fhaving independent relative tilting movement in upright planes, an elongated boom pivotally mounted on said base and carrying a drill at its outer portion, said boom comprising a boom frame of inverted U-shape having its legs spaced apart and extending down along the inner sides of said side frames, means for pivotally mounting said legs to the inner sides of said side frames whereby said boom iframe may swing in upright planes about a horizontal transverse axis to locate the drill in drilling positions at dierent elevations, said side frames being tiltable as aforesaid about said pivotal connection of said U-shaped boom frame therewith, a rigid cross bar pivotally connected to said side frames and providing a transverse connection therebetween at a point spaced longitudinally of said base from said boom frame pivot while permitting such relative tilting of said side frames, and an extensible power device connected between said cross bar and the outer portion of said U-shaped boom frame for swinging the` latter about its pivot.

12. In -a drilling apparatus, a mobile base having a pair of ground engaging traction devices, a drill support pivotally mounted on said traction devices to swing in vertical planes relative thereto about a transverse axis, said traction devices swingable up and down in spaced vertical planes about said transverse axis, a rigid cross bar pivotally connected to said traction devices for connecting the same together while permitting up and down swinging movement thereof, said cross bar spaced 1ongitudinally of said base from said transverse axis, and an extensible power device connected to said cross bar and to said drill support for swinging the latter about its pivot.

References Cited in the tile of this patent UNITED STATES PATENTS 298,625 Saunders May 13, 1884 2,135,619 Johnston Nov. 8, 1938 2,217,674 Curtis Oct. 15, 1940 2,316,672 Curtis et al. Apr. 13, 1943 2,491,273 Lehner Dec. 13, 1949 2,842,340 Burress July 8, 1958 2,845,251 Barton et al. July 29, 1958

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US298625 *May 13, 1884 Carriage for rock-drills
US2135619 *Nov 23, 1936Nov 8, 1938Int Harvester CoStabilizer for track type tractors
US2217674 *May 5, 1938Oct 15, 1940Sullivan Machinery CoPortable drill rig
US2316672 *Jun 19, 1941Apr 13, 1943Sullivan Machinery CoRock drill
US2491273 *Mar 24, 1945Dec 13, 1949Joy Mfg CoDrilling apparatus
US2842340 *Aug 16, 1954Jul 8, 1958Drill Carrier CorpDrill carriage
US2845251 *Apr 3, 1956Jul 29, 1958Joy Mfg CoMobile rock drill rig
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3205627 *Jul 9, 1962Sep 14, 1965Ingersoll Rand CoRock drill mounting
US4084359 *Oct 7, 1975Apr 18, 1978Thomas Bartlett SnellSurvey apparatus
Classifications
U.S. Classification52/115, 173/185, 52/143, 180/9.52, 52/119
International ClassificationE21B7/02, E21B15/00, E21B15/04
Cooperative ClassificationE21B15/04, E21B7/027
European ClassificationE21B7/02S, E21B15/04