US783032A - Rock-drill. - Google Patents

Description

. Px BEST AVNLABLE CO No. 783,032. PATBNTBD PEB. 21. 1905.

' C. G. FOUTE.

ROCK DRILL.

APyLIoATIoN rum 1320.14, 190s.

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Tg H I l Wilma/NW V n Rl @wom/1ro@ @n @www m www BEST AVAILABLE COF" PATBNTED PEB. 2l, 1905.

G. G. FOOTE. ROCK DMLL. APPLICATION FILED DEO. 14, 1903.

4 SHEETS-SHEET 2.

` WHT/noms @2; @JW/W BEST AVAILABLE COP` No. 783,032. PATBNTED FEB. 21, 1905. s. G. Poom.

ROCK DRILL.

APPLICATION FILED 1330.14, 1903 4 SHEETS-SHEET 3.

, .B 5 Z A i all. a J. d@ c @l f 0,/ xllll'f BEST AVAILABLE COF" PATENTED FEB. 21, 1905.

C. G. FOOTB.

ROCK DRILL.

APPLICATION FILED 1320.14, loos.

4 SHEETS-SHEET 4.

4'view of the machine. .on the line 2 2, Fig. 5.

UNITED STATES Patented February 21, 1905.

APATENT .)FFICE.

CHARLES G. FOOTE, OF DENVEILCIOLORADO.

Roeien-BILL.

SPECIFICATION forming part `of Letters Patent No. 'rssgosafdated February e1, 1905.

,Application filed December 14, 1903. Serial No. 185,140. l

T0 all whom t may concern:

Be it known that LCHARLES Gr. FooTE, a citizen of the United States of America, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Rock-Drills; and -Ido declare the following to bea full, clear, and exact description of the invention', such as will enableothers skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a partfof' this specifica- Y springjactuated dog 18, whereby the key is lockedinthe adjusted position.

tion.

My invention relates to improvements in rock-drills; and it consists of the features, arrangements, and com blnations here1nafterdescribed and claimed, all of which will be fully understood by reference to theaccom panying drawings, in which is illustrated an embodiment thereof.

I 1n the drawings, Figure 1 is a top o'r plan Fig. 3 .is a sectional view in detail and on a larger scale, taken longitudinally throughl the chuck extremity ot' the drill-holder. Fig. 4 is an end viewof the same looking in the direction of the arrow in Fig. 3. Fig. 5 is a vertical longitudinal section ofthe complete machine. Figs. 6 and 7 are detail views illustrating the construction and operation ot' the device for imparting the rotary movement to the drill-holder. Fig. 8 is a sectional view in detail and on a larger scale, illustrating the construction whereby the drill-holder is drawn rearwardly against the power-spring by the spiral cam ot' the rotary cylinder and released to allow the spring to move the drill-holder forwardly. Fig. 9 is a section taken on the line 9 9, Fig. 8. Fig. 10 is adetail View illustrating the manner of mounting the machine. Fig. 11 is a section taken on the line 11 11, Fig. 10.

The same reference characters indicate the same parts in all the views.-

Let the numeral 5 designate the guide-shell, provided with a foot 6. beveled or fiared to engage a counterpart socket formed in a holder 7, provided with a hinged clamp 8. This part 8 is hinged to the body of the holder at 9 and Fig. 2 is asection taken' 4secured at. its opposite extremity by a studbolt 10. This holderis clamped to the column or supporting bauer-,shaft (not shown) when the drill is in actual use. The foot is locked inn place on the holder by an adjustable part formed'on the holder.' The key 15 is provided with ratchet-teeth 17, engaged by a A feed-screw 19 of ordinary construction is vjournaled in the guide-shell and threaded in a nut 20, made fast to the casing 21, which is slidablyconnected with the guide-shell by gage the outer surface of the parts and c.

The space between the inner surface of the part a and the outer surface of the parts and c is preferably filled with Babbitt metal g. The part a is composed of two twin sections a' and a2, having ears as, provided with registering openings through which are passed bolts a, secured by nuts, whereby the parta is securely clamped to the parts band c. 1n order to absolutely insure the movement of all of the parts of the cylinder 24 in unison, stud-bolts a5 are employed to lock the parts together. Upon the rear extremity of the part c of the cylinder is formed a spiral cam 26, which is engaged .by a projection 27, made fast on the drill-holder 28. The parts b and care hollow to receive the drill-holder, and within the part b is located a power-spring 30, which surrounds the drill 31. This drill passes axially through the entire machine and may be removed at its rear extremity while the machine is in position adjacent to and pointing toward the breast of the rock. spring engages the rear end ot' the part b in- One extremity of the power- ,part 12 and a-relatively stationary shoulder Vmotor and is held in operative relation with f allowing the collar 34 to move rearwardly suiiciently to disengage itself from the cylinoperatiOn, while the operating parts of the teriorly, while its forward extremity engages I a shoulder 32, with which the drill-holder is provided.

The drill-holder and drill are reciprocated by the rotation of the cylinder containing' the cam-groove. This rotary action of the cylinder may be imparted in any suitable manner. As shown in the drawings, an electric motor 33 is used forsupplying the power. This motor is so located that its axis coincides withV the axis of the drill 31, which passes therethrough. Itis evident that the motor may be connected with the rotary cylinder in any other suitable'rnanner. The armature of the motor is suitably connected to rotate a collar 34, which is int-erlocked with the cylinder by conical projections 35, engaging counterpart recesses formed in the rear end of the part b of the cylinder. The collar 34 has a limited longitudinal movementon the armature of the the cylinder by a coil-spring 36, which surrounds a rearward extension of the collar and Vis located between a shoulder of the collar and -a stop 37, applied to the motor-armature. In case of accident or ifffor anyv reason the rotation of the cylinder is suddenly stopped or resisted with sufficient force to result in breakage of some of the parts of the machine if its; movementis continued the spring 26 will yield,

der, thus allowing' the motor to continue its drill remain stationary.

The shape of the cam 26 formed on the cylder is clearly illustrated in Fig. 8. When the drill-holder is at its forward limit of movement, the projection 27 thereof engages the point A of the cam, which will be termed the "initial point. Then as the cylinder is rotated the cam is tu rned andthe projection 27 of the drill-holder being-in engagement therewith causes the latter to be moved rearwardly against the spring 29 until the terminal point B of the cam is reached. Here the projection 27 of the'drill-holder is released and travels forward in a straight line with the drill-holder from the point B to the point A, the forward movement of the drill-holder being imparted by the recoil of the spring 29, which has been placed under tension by the rearward movement-of the drill-holder.

To the forward extremity of the drill-holder is secured a toothed wheel 38 by a set-screw 39, passing through an opening in the forward extension of the collar ofthe wheel and threaded in the drill-holder. At this point the body of the drill-holder 28 is connected with a reduced forward part 40 by the setscrewor stud-bolt 39. So far as the operation of the drill-holder is concerned the parts 28 and 40 are virtually integral and operate in unison. Hence when the term drillholder is hereinafter referred to without using a reference character it must be understood that the entire drill-holding device is intended.

Between the collar of the toothed wheel and the bearing 41 of the casing is located a buffer-spring 4Q. The toothed wheel 38 is prevented from rotating with the cylinder by a pawl 43, hinged at 44 to a stationary part 45, secured to the casing by a screw 46. This pawl is engaged by a leaf-spring 47, also held in position by the screw 46.

Below the pawl 43 the wheel 38 is engaged by a tooth 48 of a plate 49, pivotally connected with the casing at its rear extremity, as

shown as 49, and normally held at its limit of downward movement by a spring 49e. This tooth 48 is provided with a projection C,

'extending upwardly from the body of the tooth. As the drill-holderis moved rearwardly against the power-spring the tooth 48 first passesbetween two teeth .or cogs of thewheel 38. Then .as the rearward movement of the drill-holder is continued the wheel engages the upward -projection C, which forms a stop and causes the plate 49 to turn upwardly on its pivot 49, and this upward movement (the tooth 48 engaging the side of the wheel, see Fig. 2) turns the wheel and drill-holder one tooth in a direction opposite the rotation of the cylinder. Then as the drill-holder moves forwardly the wheel becomes disengaged from the tooth 48, while vthe plate 49 returns to its normal position and is ready to perform the Vsame function every time the drill-holder moves rearwardly.-

The forward extremity of the drill-holder is provided with lateral openings in which are -placed locking-pieces 50, whose inner edges areV adapted to engage the drill 31, While their outer edges project from the openings inthe drill-holder to engagement with a surrounding collar 51. The outer edges of the pieces 50 are inclined, being widest at their forward extremities. The inner surface of the collar 51 is shaped to force the pieces 50 inwardly against the drill-holder, whereby they are caused to lock or clamp the latter securely in place as the collar 51 is'rnoved forwardly. In the rear ofthe collar 51 is a washer 52, and in the rear of this washer is a screw-sleeve 53,

which is threaded on the drill-holder and is y,

adapted to be screwed against the washer 4by the useof a Spanner-wrench engaging pins 54, mounted on the said screw-sleeve. lt is evident that by turning the sleeve in the one direction or the other the drill may be tightened in the drill-holder or made loose therein, as desired. If it is desired toremove the drill from the drill-holder, it is only necessary to turn the sleeve 53 in a direction to cause it to move rearwardly a sulicient distance to allow the collar 51 to be moved in the same direction a sufcient distance to allow the drill 31 to bedrawn rearwardly BEST AVAlLABLECOF" venient way of removing dulled drills and substituting sharp ones, and by reason of my improved construction much time is gained inl this part of the work. It is well known that drills while in use become quickly dull the machine it is'not necessary to turn the casing on its support in order to make room to remove the drill from the front, as is usually required in taking out one drill and substituting another. Any length of drill-bit may be employed.

From the foregoing description the use and operation of my improved rock-drill will be readily understood. The wires or electric conductors 56, connected with the motor, may lead to any suitable source of electricity. When it is desired to operate the drill, the current is turned into the motor, and the rotation of the latters armature imparts a corresponding movement to the cylinder 24. From what has been heretofore explained it will be understood that this cylinder includes a number of parts which are connected together and rotate in unison. Everytime the cylinder completes a revolution the drillholder is moved rearwardly against the spring 30 and released, whereby the drill-holder isl thrown forwardly by the recoil of the spring. This forward movement may be given any desired force, depending on the strength of the power-spring employed. It is evident that the number of strokes of the drillwill depend on the speed ofthe motor. and this may be regulated as desired. Every time the drillholder moves rearwardly through the instrumentality of the cam 26, as heretofore explained, the toothed wheel 38 is made to engage the tooth 48 of the plate a9, whereby the wheel, together with the drill-holder and drill, is given a rotary movement of a degree equal to what may be termed one tooth of the wheel, or the distance from the center of one tooth to the center of the other tooth, practically. In this way the necessary rotary movement is imparted to the drill and drill-holder during the operation. As the cylinder24 is rotated the pawl 43, engaging the toothed wheel 38, prevents the wheel from rotatingin the same direction with the cylinder 7, and when the toothed wheel and drill-holder are rotated it is in a direction opposite the rotary movement of the cylinder, as will be clearly understood from the drawings and description.

It will be observed by an inspection of the drawings that there is a space /z between the forward extremity of the cylinder part b and the rear or cam extremity of the cylinder part e. rlhe space t (see Fig. 8) is of sufficient width to allow the projection 27 of the drillholder to pass. Hence if the drill is forced against the rock with sufficient pressure to drive the drill-holder against the power-spring 29 and compress the latter su lliciently to cause the pin 27 to occupy a position forward of the cam or in the space z betweenthe two cylinder parts it is-evident that the motor and the entire cylinder 24 may rotate freely without any movement whatever of the drill-holder and drill-bit, since under the conditions stated the entire cam will be located forward of the projection 27. y

This is an important feature,"

since it will prevent breakage of the mechan- Y ism under certain circumstances. Again, if the drill is pressed against the rock with sufcient force to move the drill-holder longitudinally in the cylinder a portion of the distance between the parts A and B of the cam it is evident that the length ot' the drills stroke will be correspondingly diminished.

Having thus described my invention, what I claim is- 1. In a rock-drill, the combination with a guide-shell and acasingslidable thereon, of a hollow cylinder mounted to rotate in the casing, a power-spring located in the cylinder, the latter being provided with a cam, and a hollow drill-holder entering the cylinder and having a`projection engaging the cam of the rotary cylinder, whereby as the latter -is rotated, the drill-holder is moved rearwardly against the power-spring and released.

2. The combination with acasing,of acylinder mounted to rotate therein, the cylinder being hollow,a power-spring located in the cylinder the latter being provided with acam,a -holloo inder and having its axis in line with the axis ofthe cylinder,the drill-holder being engaged i by the c am of the cylinder as the latter is rotated, whereby the drill-holder is forced rearwardly against the power-spring and released, the recoil of the spring acting to throw the drill holder forwardly causing the drill to strike the r'ock with the necessary force.

3. In adrill,the combination with a suitable support, of a hollow rotary part, a hollowdrillholder adapted to enter said part and having its axis in line with the rotary part, the rotary part being provided with a cam, and the drillholder being provided with a projection engaging the cam, whereby as the cylinder -is rotated, the drill-holder is forced rearwardly' i BEST AvAiLABLE coP its rearward movement, and a drill suitably connected with the drill-holder and passing entirely through the machine whereby it is removable at the rear.

5. In a rock-drill, the combination with a suitable support, of ahollow drill-holder, and a drill passing through the drill-holder and projecting from the rear of the machine, the drill being suitably connected with the drillholder, and suitable means for imparting a reciprocating movement to the drill-holder, comprising a hollow rotary part which the drill enters, a spring in the rotary part, the latter being provided witha cam adapted to engage the drill-holder and force the latter rearwardly against the spring in the hollow rotary part.

6. In a rock-drill, thecombination of adrill and mechanism for reciprocating the same, the drill being of suhicient length to extend entirely through the machine from front to rear, the reciprocating mechanism of the drill being formed hollow to permit the removal and insertion of drills at the rear of the machine, the drill being formed of suicient length for the purpose, the hollow drill-holder through which the drill passes, a hollow rol tary part surrounding the drill-holder and provided with a cam engaging the drill-holder, and a spring located in the rotary part, the cam of thelatter acting to force the drillholder against the spring andrelease it as described.

7 In a rock-drill, the combination with a suitable casing, ot' a hollow drill-holder, a hol- 35 glow rotary cylinder having its axis in line with :the axis of the drill-holder, the drill-holder ybeing adapted to enter the cylinder, a drill passing through the drill-holder and cylinder and adapted to be removed from the rear oli' the machine, a power-spring located in the hollow of the cylinder and having its forward extremity engaging a stop with which the drill-holder is provided, the cylinder being provided with a cam acting on a projection of the drill-holder, whereby as the cylinder is rotated the drill-holder is forced rearwardly against the spring and released, the latter acting to drive the drill-holder and drill forwardly.

8. In a rock-drill, the combination of a hollow drill-holder, a hollow rotary cylinder havingits axis in line with that of thedrill-holder, the drill-holder entering the cylinder, a connection between the cylinder and drill-holder whereby the rotary action of the cylinder imparts movement to the drill-holder in one direction, a spring for moving the drill-holder in Vthe opposite direction, a motor for operating the rotary cylinder, and a suitable operative connection between the motor and the cylinder.

9. 'Ihe combination c" a. hollow drill-holder, lich the drill-holder -ction between the erebv as the cylinder is rotated the drill-holderis moved in one direction, a power-spring connected in operative relation with the drill-holder for imparting the forward movement thereto, a motor whose armatu're is in line with the axis of the drill-holder and cylinder; a collar interposed between the motor and the rotary cylinder, the collar being, provided with pins adapted to enter recesses formed in the rear extremity of the cylinder, and a coil-spring located in the. rear of the collar, whereby the latter is yieldingly retained making it possible for the collar to continue its rotation independently of the rotary`cylinder.

10. In a drill, the combination with a suitable casing, of a drill-holder,atoothed wheel made fast to the drill-holder, a plate pivotally connected to the casing and having a tooth adapted to pass between two teeth of the toothed wheel as the drill-holder is moved rear w ardly,'the tooth of the pivoted plate having an upward projection whereby as the rearward movement of the drill-holder. is continued, the plate is raised sufliciently to impart a partial rotary movement to the wheel and drill-holder, and suitable means engaging the toothed wheel to prevent the latter from moving in a direction the reverse ofthat irnparted by the pivoted plate.

11. In a rock-drill, the combination with a95 suitable casing, of ahollow cylinder mounted to rotate therein, a power-spring located in the rear portion of the cylinder,a hollow drillholder entering the cylinder and engaging one extremity of the power-spring, a cam formed on the inner part of the cylinder adjacent the drill-holder and adapted to engage a projection on the drill-holder to impart a reciprocating movement to the latter, and the cylinder being further provided with a space forward of the cam, of suicient width to per- IOO mit the rotation of the cylinder while the drillp holder remains stationary, when the drillholder is forced against the power-spring sufficiently to cause the projection of the drillholder to occupy the said space forward of the cam.

inner parts having a cam provided with a .spiral face for the lift and a perpendicular tace for the drop, and a drill-holder entering the said cylinder and having a radial projection entering the space between the inner partsof the cylinder and acted on by the cam, and a power-spring locatedin the cylinder and engaged by the drill-holder, whereby the radial projection of the drill-holder is normally held against the cam-face.

13. lhe combination with a suitable casing, of a hollow cylinder mounted to rotate therein and composed o't' two parts transversely scp- 12. The combination with a suitable casing,

IIO

1 1 5 outer cooperating part surarated and an outercoperating part su rrounding the two separated parts, one of the inner parts havin ,q a cam provided with a spiral face for the lift and a perpendicular face for the drop, and a drill-holder entering the said cylinder and having a radial projection entering the space between the inner parts of the cylinder and acted on by the cam, a transverse spacebeingleftbetween the separated parts IO of the cylinder forward of the cam to allow the radial projection of the drill-holder toen ter when'the drill is forced against the rock to compress the power-spring suiiciently for the purpose.

In testimony whereof I aflix my signature in presence of two witnesses.

v CHARLES G. FOOTE. Witnesses:

DENA NELSON', A. J. OBRIEN.

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