US683404A - Rock-drilling machine. - Google Patents

Description

NITED STATES PATENT OFFICE.

MANETI-IO CORTES JACKSON, OF DENVER, COLORADO, ASSIGNOR, BAY i ,DIRECT AND MESNE ASSIGNMENTS, TO THE GARDNER ELECTRIC DRILL AND MACHINERY COMPANY, OF SAME PLACE.

ROCK-DRILLING MAoHlrN-E.

ySIEEtJIlEI(.)AGLVI'ON' part of Letters Patent No. 683,404, datedseptemher 24, 1901. Application led December 20, 1899i. Serial No. 741,031. (No model.)

'To @ZZ whom it may concern.-

Be it known that I, MANETHO Coarse .TACK- SON, a citizenof the United States of America, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Rock-Drilling Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and tothe figures of reference marked thereon, which form a part of this specication.

My invention relates to improvements in rock-drilling machines adapted to be operated through the instrumentality of a dexible shaft and electric motor or other suitable power, my object being to provide a machine of great efficiency, but which shall be operated at a minimum cost. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of my improved machine. Fig. 2 is a fragmentary horizontal section taken through the same. Fig. 3 is a vertical section taken through the drill mech anisln. Figs. 4 and 5 are cross-sections taken on the lines X X and Y Y, respectively, Fig. 3, lookin gin the direction of the arrows. Fig. 6 is a top view of the clamp and the slotted plate mounted thereon and forming a support for the guide-shell. Fig. 7 is a fragmentary view of the crank-shaft, shown partly in section. Fig. 8 is a cross-section taken on the line W W, Fig. 3. Fig. 9 is a cross-section taken on the line Z Z, Fig. 8. Fig. 10 illustrates the supporting-bar, the clamp, and the guide-shell viewed at right angles to Fig. 1. Figs. 11 and 12 illustrate an electric motor and the manner of connectingit with the iiexible shaft.

Similar reference characters indicating corresponding parts in the views, let the numeral 5 designate the casing of the machine, inclosing the reciprocating shaft 7, carrying the drill-bit 8, which is secured to the lshaft by a bolt 9, passing through the shaft and having an opening through which the shank of the bit passes. The shaft extremity is provided with a socket 5, in which the bit is inserted, and an opening 5c, through which the bolt passes. (See Fig. 9.) The bolt 9 isemployed to lock the bit in place.` This' is done by tightening the nut 10. The head of the bolt 9 is made of sufficient weight to perfectly balance the shaft, whereby there is no tendency of the latter to turn when in any position except as it is actuated by the automatic devices hereinafter explained. -The rear portion of the reciprocating shaft is connected with the crank-shaft 12 by a yoke 13, whose front and rear extremities 13a and 13c engage the top and bottom of the casing,which is fashioned to accurately guide the same. The front part of the yoke is provided with an opening through which the reduced portion 'i'a of the drill-shaft passes. The yoke is open, as shown, to receive the shaft extremity. A space is left between the rear extremity of the drill-shaft and the rear extremity of the yoke to allow the said parts a limited independent movement. The portion ofthe drill-shaft located within the yoke is surrounded by a )coilspring 14, one extremity of which engages a collar 15 on the shaft, While the other extremity bears against the front part 13 of the yoke. The part of the drill-shaft immediately forward of the yoke is also surrounded by a coil-spring 16, which is located between the shoulder 7c of the shaft and the forward extremity of the yoke. These springs 14 and 16 serve asbuers, forming a yielding connection between the yoke and the drill-shaft and permitting the yoke to move in either direction independently of the shaft. is an important feature. In case the drill-bit gets stuck or fast in the hole the yoke can move `backward in response to the crankshaft without breaking or injuring the mechanism. Again, if the drill-shaft is moved too close to the rock the yoke actuated by the crank-shaft may move forward after the drillbit ceases to move. The rear extremity 13c of the yoke is provided with a cam-slot 13d,

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which is engaged by the crank 17 of the shaft.

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made fast to the arms in any suitable man- 1 ner. The sleeve parts 17d of the crank are surrounded by a loose bushing 13, which directly engages the walls of the cam-slot 13d and forms an antifrictional bearing between the crank and the yoke. By the peculiar shape of the slot 13d, being an epicycloidal curve, superior thrust or striking power is obtained. It is so formed that when the crank f first engages the upper or front portion of the slot the entire forward thrust is made while the crank is making one-fourth of a revolution, thus imparting about double the striking force ordinarily obtained by cam or eccentric mechanism. By reason of this #fean ture great striking force may be obtained t even when the crank is rotated at a moderate speed. Moreover, the curve 'of this slot is 1 such as to permita rebound of the drill-shaft after striking the rock without subjecting` the parts of the mechanism to the severe jar or concussion incident to the use of a straight z slot. The peculiar curve of the slot also gives the advantage of requiring a full one-half revolution to the crank in withdrawing the drill-shaft, giving additional power to withdraw the bit and lessening the momentum' during the backward stroke.I It must be unl derstood, however, that while I prefer the peculiarshape of slot shown in the'drawings and heretofore described the invention is not limited to any special construction of slot.

The crank-'shaft 12 is suitably journaled in the casing. (See Fig. 2.) To one of the projecting extremities of this shaft is made fast` a bevel-gear 19, which meshes with a similar gear 20,7to which one extremity of the exible shaft 2l is secured. The two gears Vare inclosed by a 'dust-proof gear-case 22. To the 'opposite protruding extremity of the lcrank-shafti12 is made fast a gear 23,' which meshes with a small gear or pinion 24, fast on a short shaft V25, journaled on the casing 5 and having a fly-wheel 26 made fast to its outer extremity. By this construction and arrangement the speed of the fly-wheel becomes greater than that of thecrank-shaft, enabling me toiobtain the desired vsteadying results and uniformity of mot-ion by the use of a much smaller ily-wheel than could otherj wise be employed. This is an important feature in` a Vmachine of vthis class, `since the space in which themachine must be oper- `ated Vis nearly always limited, and a large Iiywheel, if not prohibitive, becomes a source of great annoyance. As shown in the drawings, the iiy-Wheel is provided with an interior flange which conceals its operating-gearand pinion. The extremity of the iie'xible shaft 21 remote from the gear 2O is connected with an electric motor 27 lby a belt 28, e-ngaging pulleys 30 and 3l, respectively, mounted on the motor-shaft 27'a and a short shaft 29, withwhich theextremity of theiexible shaft is directly'connected. The pulley3O is readily detachable, whereby the uniformity of the drill-shaft stroke may be preserved re formed integral with the casing.

gardles's of the revolution or speed of the motor or the voltage of the current with which the motor is connected. This is an important feature, since when working in different localities currents of different voltage must necessarily be utilized, but by using pulleys 'of various sizes the uniform rapidity "of stroke may be maintained. This belt connection is sufficiently positive for all practical purposes and at the same time prevents breaking or injury to the mechanism in case the movement of the crank-shaft should be suddenly arrested. It must be understood, however, that any other suitable connection 'between the motor and flexible shaft may be employed, also that vany desired power other than an electric motor may be utilized for operating thema-chine.

The mechanism for imparting the rotary movement to the drill-shaft Awill now be described. `This shaft is provided with a spiral or inclined groove A anda straight groove B, the one beingindicated by full lines and the other by dottedlines in Fig. 3. The 'drillshaft is surrounded by two ratchet- wheels 32 and 33, inclosed by keepers 34. and 35,10- cated within the casing 5 'and locked against rotation th'erein. These two keepers are located between rings 36 and 37, surrounding the drill-shaft 'and formed integral with the casing. These rings lock the keepers and their ratchet-wheels against longitudinal movement in the casing. The keepers and their respective ratchets are separated by a washer 38. The ratchet 32 is locked against rotation in the direction indicated bythe arrow in Fig. 4L by spring-held dogs 39, pivotally mounted'on the keeper 3-l. The ratchet 33 is lockedagainst rotation in the same direction by similar dogs 40. The ratchet 32 isprovided with a lug 4l, which engages the spiral-groove A of the drillshaft. The ratchet 33 is provided with a similar lug 42, engaging the straight groove B of the drill-shaft. Hence as the said shaft is moved forward in the performance of its function it moves in a direct line, since the dogs 40 and the ratchet 33 lock it against rotation in the direction indicated by the arrouT in Fig. 5 by virtue of the engagement of the lugv 42 with the straight groove of 'the shaft. Again,during the backward stroke the drill-shaft turns in the direction opposite that indicated by the arrows in Figs. 4 and 5, since the dogsk 39 lock the ratchet 32 against movement in the direction o f the arrows and the shaft turns by virtue of the engagement ofthe lug 4l with its spiral gQCWe',

The drill-casing 5 is slidingly mounted -on a guide-shell 43, in which is journaled the feed-screw 44, engaging a depending nut 45, The turn ing of the feed-screw bymeans 'of a handcrank 45 causes the casing 5 and its attachmentstomove back and forth on the shell, a'sgdesired'.

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The bottom rof the guide-shell sfprovide'd" Y with a depending projection 46, grooved to receive and retain a plate 47, which rests on a clamp member 48, cooperating with a clamp member 49. The two clamp members are hinged at 50 and embrace the supporting-bar 51. They are locked on the shaft by a bolt 52, fastened by a nut 53. This bolt also passes through a projection 47c of the plate 47. This plate is provided with a slot 47a, through lwhich passes a bolt 54, whose head engages a groove in the bottom of the plate and is larger than the width of the slot. The depending part 46 of the guide-shell is connected with this plate by a bolt 54, passing through an opening in the part 46 and the slot of the plate 47 By loosening the nut 56 on this bolt the guide-shell and the drill mechanism may be shifted laterally, the bolt traveling in the slot 47 a for the purpose of inserting a drill-bit, after which the machine may be returned to its normal position in proper alinement with the drill-hole. All this may be accomplished without loosening the clamp embracing the bar 51 and without getting the machine out of alinement. If it is desired to adjust themachine to drill in a dilferent direction, the nut 53 is loosened.

In the operation of the machine the crankshaft is rotated from the motor 27 through the instrumentality of the iexible shaft and the connections heretofore described. The operation of the crank-shaft imparts a reciprocating movement to the drill-shaft by virtue of the engagement of the crank 17 with the slot 13d of the yoke, the drill-shaft being automatically rotated in the mannerset forth. The drill-casing is moved back and forth on the guide-shell by the operation of the feedscrew. The shoulder 45 of the crank 45a engages the end of the guide-shell and prevents the screw from traveling longitudinally when turned to carry the casing forward, and the collar 44a of the screw prevents the backward movement of the latter when the casing is traveling rearwardly. The yoke 13 is locked against rotation by tongues C and D, formed on the casing and engaging counterpart grooves formed, respectively, in the top and bottom of the yoke. 4

Having thus described my invention, what venting the rotation of said yoke, stops on said shaft to the front and the rear of said sliding connection and a spring interposed between each stop and said connection, substantially as described.

2. In a rock-drilling machine, the combi-I nation with a guide-shell and suitable drilling mechanism mounted thereon, of a supportingbar, a clamp embracing the bar, a plate bolted to the clamp and provided with a slot extending parallel with the bar, the guide-shell being provided with a depending part having an opening registering with the slot in the plate, and a bolt passing through the said opening and the said slot, the bolt being secured by a nut so that by loosening the nut the guide-shell and the machine supported thereon, may be shifted in a direction parallel with and independently of the supportingbar without loosening the clamp on said bar.

3. In a rock-drilling machine, the combination with a guide-shell and a suitable drilling mechanism mounted thereon, of a supporting-bar, a clamp embracing the bar, a plate bolted to the clamp and provided with a slot extending parallel with the bar, and a groove extending parallel with but larger than the slot, a part mounted on the guideshell and cooperating with the plate, the said part having an opening registering with the slot of the plate, and a bolt passing through the slot and the opening in the cooperating t ioned to interlock with said plate and slide` thereon, the aperture in the shell part registering with the slot in the plate.

5. In a percussive drill, the combination of an inclosing shell, a drill-shaft guided therein, a sliding yoke having a resilient connection with the drill-shaft, and a crank-shaft mounted in the shell and connected to said yoke by means of a slot therein, said slot being curved as described to permit the crank to impart a quick forward movement and a relatively slow retractile movement to the yoke and drillshaft as the crank rotates through the forward and backward strokes, respectively.

In testimony whereof I ax mysignature in presence of two witnesses.

MANETI-IO CORTES JACKSON.

XVitnesses: Y

A. J. OBRIEN, GRACE MYTINGER.

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