US1393257A - Rock-drill - Google Patents

Description

I. C. WRIGHT.

ROCK DRILL.

APPLICATION FILED Aus.26, I9I9.

rammed om.. III, IIIIZI.,

4 SHEETS-SHEET I.

IIIIIIIIIIIII/ III 1. c. WRIGHT.

ROCK DRILL. APPLICATION FILED AUG-25, |919.

Patented Oct. M, WZL.

4 SHEETS--SHEET 2.

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:Pllll l WVM/woo J. c. WRIGHT.

RocK umu. l APPLICATION FILED AUG-26, 199. l Lgm Patentd 00h M, MEL

4 SHEETS-SHEETS.

J. C. WRIGHT.

ROCK DRILL. APPLICATION ,FILED Aume. 1,919.

Patented 001s. H, 1921i.,

4 SHEETS-SHEET 4.

.ans c. wnren'r, or Ycome i eramos, corone.

non It: -DRIILL naaaaaa To all whom itmay concern:

Be it known that l, JAMES C. WRIGHT, a citizen of the United States, residing at Colorado Springs, in the county of El aso and State of Colorado, have invented certain new and useful llmprovements in Rock- Drills; and'l do hereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in-the art to which it appertains to make and use the same.

This invention relates to rock drills in general, but has reference more particularly to a portable hand-actuated machine for drilling purposes including` in cooperative relation, a suitable drill-steel, @means for automatically rotating said steel, a. reciproeating hammer, and selective means for advancing the drill steel in exact proportion to requirements ofthe work imposed upon it, either manually or under control of said hammer automatically.

Various. devices either Ifor rotating or feeding drill steels are objectionable by reason of the fact that they are constant in their operation, making no provision or allowances for abnormally hard spots or areas under* treatment, and the consequent .jamming or sticking .of drills, with relsulting' injuries to the machines tliemse ves.

An important object of the present invention is therefore, to provide most eicient drill-rotating and feeding mechanisms which will remain at rest when the drill. steel sticks orvbecomes jammed, and which r when the same isreleased, will again go into operation automatically.

A further object of-this invention is the production of means for4 automatically graduating the strength of the hammer blow, from a full, heavy stroke under normal conditions, to-a lighter, shorter stroke at such times as .the-drill steel may stick or befjammed.

A further object is the prnduction cfa compact, durable and efcient portable dlrlll which is entirelyautomatic in its operation,

the operator supplying the motive power only, and one in lwhich the hammer directly governs the feed of the drill carriage, so'

that when the stroke of the hammer is not full or complete the feed mechanism re-- mains at rest, and when the drill s teel sticks the feed -of the carriage and rotation of the heretofore employed' Specification of Letters Patent. Patented @mtu ll-ll, llggll@ 'Application tiled; august 26, 1919.' Serial Nalael.

eral features of construction, general arrangement and combination of parts herein after described and claimed.

Reference being had to the accompanying drawings which form part of this application for Letters Patent, and wherein like characters indicate corresponding parts in the several views:

Figure 1 is a side elevation of my im proved rock drill;

Fig. 2 is a longitudinal, vertical, section of the invention taken centrally through the structure;

Fig. 3r 1s an eleva-tion of the chuck end of the drill;

Fig. l is a transverse, sectional view taken on the line 4-4 of Fig. 2, showing the hammer actuating cams; Y

Fig. 5 is a vertical, transverse section through the hammer shank and its oppo sitely disposed trunnions;

Fi 6 is a detail side elevation of the step-y-step feed drill ratchet and operative connections;

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Fig. 7 is a cross-sectional view of a por tion of the drill structure disclosing in side elevation the parts shown by Fig. 6;

Fig. 8 is a longitudinal, central section of the rotatable chuck;

Fig. 9 is a transverse, sectional view of drill chuck on lines 9 9 of Fig. 8;

Fig. 10 is a detail view showing a supply pipe connection foi-watercooling the drill steel;

Fig. 11 is a central, vertical section through the front end of drill, showing drill chuck, the hammer head and shank, and re tracting cams in position for striking a blow; v

Fig. 12 is an elevation of drill mounting support showing in rear elevation a drill mounted thereon;

Fig. 13 is a plan viewof a coupling socket for securing the drill structure to the drill support;

Fig. ll. is a sectional view through drill support taken on the line 14-14 of 12; and

Fig. 15 is also a transverse, sectional View through the drill support taken on the line iania of rig. ia.

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'1n the accompanying drawings the .numeral 1 indicates the drill body or casing,

preferably of cast iron, provided with a longitudinal chamber 2 in whlch rec1procatesa .hammer 3. The shank or reduced stem 4 of this hammer extends rearwardly through the casing and its removable'head 5. At-an intermediate point within the `casing' 1 shank 4 is formed with a shoulder 6 its stem is perforated throughout its longi-Q" between which and the inner surface of the` .head 5 is coiled a relatively strong compression 'spring 7 for the purpose of actuating the hammer. This hammer together with tudinal axis from end to end thus constituting a waterway 8 for purposes which will' laterv appear, and communicates at its rear p tially a medianv position. The said trun- 13, held injplace. by-screws 14, eachv having `lnions 10, are each provided with renewable and relatively hardened annular bushings the customary driving slot in its head, and

. each perforated by a. small pinway 15 adapted' receive a spring pressed pin 16 for locklng them in position against the possib1l1ty of accidental rotation, as clearly indicated by Fig. 5.

The cams 11,.,11, are spaced apart, upon their shaft 12 to permit passage of the forward portion of the hammer shank' 4 as shown by Fig. 4, and are positively driven in clockwise direction, with their supportmg shaft 12, by agency of a pinion 17 affixed to one endof said shaft intermeshing with a driving-gear wheel 18 keyed near one end a main driving shaft 19 also journaled in osite sides of theI casin 1.

s a means of rotating t e main shaft 19 there is provided at each projecting end a removable and adjustable crank handle 20, either of which may be readily removed if desired when operating adjacent a side wall or other obstruction, the drill being operablel by agency of both or either of said cranks.

This main driving shaft 19 has formed upon its surface a worm 21 constantly in mesh with a worm wheel or gear 22 upon one end of a .power transmitting shaft 23 rotatably mounted in` bearings 24, 25, 26, equlpped at its opposite forward end with a sultably housed-in spur gear 27 as the Vmeans of rotating the drill chuck now to be described.

Inclosed within the1 forward portion of casing 1, a drill chuck 2 8 is rotatably disposed, the same being provided near its outer end with a surroundlng ratchet 29 enga ing.

the spur gear 27 aforesaid, by which 1t is rotated as best shown b Flg. 11. This chuck, detached, is also ilustrated by longitudinal and transverse sectional views, 8 and 9, respectively, from which it will be apparent' that provision is made .for automatically withdrawing .a drill steel after each stroke of the hammer, and for permitting ready removal of the steel itself when occasion requires. To these ends the outer cylindrical chuck-casing is shouldered interiorly as at 30, and at diametrically opposite points is splined longitudinally as at 31, 31, through its rear open end to receive sliding feathers 32, 32, projecting in like relation from the rear portion of an innermost telescoping chuck member 33, also shouldered as at 34. The inner end of the outer chuck casing 28 is closed by a centrally perforated screw plug 35 after said innermost member has been inserted in splined and reciprocating relation, while interposed between the shoulders 30 and 34 of the relatively slidable chuck members is positioned a coiled spring 36 which normally butyieldingly retains said member in a retracted position.

. This latter or inner longitudinally slidable chuck member 33 is. rooved upon opposite sides throughout its ength as at 37 37, so as to permit passage of lugs 38, projecting from opposite sides of a suitable drill steel 39, which in assembling is introduced into the chuck as indicated by Fig. 11, and then rotated to the interlocked position shown, with its rear end projecting through' the central opening of closure plate 35 into the path of hammer 3.

Upon cam shaft 12 opposite its pinion 17, is keyed a driving gear 40 whichmeshes con# stantly with a pinionv 41 carried by a transversely arranged fly-wheel shaft 42 having secured to its opposite ends fly- wheels 43, 43, for imparting uniformity of movement to all v rotary parts heretofore described.

The aforesaid casing l surmounts an inverted, substantially T-shaped web 44, slidably arranged in the track grooves 45 of a channeled base 46 as best shown by Figs. 3 and 4. A'feeding screw 47 is j ournaled in the base 46, and engages with a nut 48 depending from web 44whereby the entire drill casing or carriage may be caused to slide freely in the track grooves 45 by rotation of said feed screw 47 in either direction. And although feed of the drill carriage` and attending parts may be accomplished manually'by rotation -of the said screw 47 by agency of the crank handle 49, I prefer to ymake this feed automatic by substantially the following means.

Upon the feed screw 47 is xed a gear 50 'meshing with a corresponding gear 51 aixed to one sectlon 52 of a telescopng, sec- 13o` meent? tional or extension shaft. rlhis tubular shaft section 52 is suitably journaled in the base 4 4 and -telescopically receives the coperatingshaft section 53^sp1ined or otherwise secured thereto for relative sliding or longitudinalmovement only, the latter Section being suitably journaled at its outermost end. The shaft section 52 is -i'further supported at its rear end by a bracket 54 rising from a frame 55 projectingrearwardly from base 44, and is surrounded by a relatively fixed collar 56, normally held against bracket 54 by agency of a spring 57 interposed between the opposite side of said bracket and gear 51. rlhe gear 51 is thus normallymheld in mesh with the gear 50, for automatic control of the latter as will later 'appear but when/it is desired to disconnect these gears in order that feed screw 47 may be manually actuated by agency of crank 49, this is accomplished by a forward throw of shift lever 58 pivoted upon the lower end of bracket 54 and provided with a small lug 59 for engagement with a fixed pin 60 to prevent said lever falling backward.

To the advance end of slidable shaft section 53 is keyed a ratchet wheel 61, adjacent to which' there is loosely mounted upon the same shaft section an adjusting lever 62 carrying a spring pressed drag pawl 63 capable of engaging the teeth of said ratchet, and above this pawl a pin 64 for retaining the lever at times in adjusted positions. Ad-

jacent the upper portion of lever 62 a` bracket 65 projects from the lside of casing 1 having formed therein an arcuate slot 66 in which travels a headed guide-pin 67 also 4 rigidly secured to and projecting from the rear of lever 62. Between the slotted portion of'bracket 65 and the head of guidepin 67 a compression spring 68 is placed for the purpose of normally retaining lever 62 in contact with the face of its slotted bracket I65, and of retaining the aforesaid adjustingpin 64 ina selected one of the series of re-v taining holes;Y 69 through the bottom of bracket 65. When it is desired to transfer the pin 64 from one to another of the holes 69, this is accomplished by sliding the entire. lever 62 laterally upon shaft 53., against the tension of spring 68, until said pin 64 is withdrawn, whereupon by a reversal of operation .the pin may be replaced in another of the holes 69 for purposes of regulating the intermittent advance of the drill steel between each stroke -as will appear in a statement of operation to follow.

' As a part of the step-by-step advance feed mechanism of the drill carriage and drill steel, there is also rotatably mounted at the forward end of shaft section 53 a second or feed lever 70 spring pressed as at 71 to hold its free end normally elevated, and carrying a drag pawl 72 also spring pressed to engage the teeth of ratchet 61, while the.

free end of the feed lever 70 is equippedy ga'gement by the beveled surface of cam 74, f

which also regulates the rotary movement imparted to shaft 53 and through it to feed Mscrew 47 to advance the drill carriage and steel for a fresh cut.

Although advancement of the drill car# riage and drill steel may be accomplished manually, it will be particularly noted that provision is hereinmade for automatic feeding, as a matter of preference, as also increased efficiencz and that the hammer 3 lcontrols Jthe fee of the drill carriage.

@bviously the carriage may be operatively i located and the drillsteel positioned with reference to the rock or other vmaterial to be drilled by any approved means, but by way of exemplification l have illustrated a special form of support in detail by Figs. 12 to 15 inclusive, wherein 75 indicates body having at one end a shoe 76, and at its opposite endl a cross head 77 carrying lpivotal nuts 78, 78, through which are threaded set screws 79, 79. Adjustably circular undercut socket 80 one side of which is bolted in position as indicated at 81 in Fig. 2, to receive a diverging circular stud 82 depend-ing from base 46, the same being adapted to 1securely clamp said stud in adjusted positions.

The foregoing being a description of my present invention in one operative form of a tubularv clamped upon this body member 75 is a construction, its `operation may now bey as follows briefly yset forth -llaving been set up, as indicated by Figs. 4

1. 2 and 12, upon a universally adjustable drill support adjacent the work to be im posed upon the invention, with its steel 39 in contact with the surface to be drilled, the main shaft 19 is rotated by agency of either or both cranks 20, carrying with it driving gear 18 in a counterclockwise direction.

Power is thence transmitted Vthrough intermeshing pinion 17 to the cam shaft 12, and cams 11. 11, thereon; as also through a gear wheel'40 to a pinion 41, shaft 42. and fly wheels 43, 43, for-well understood balancing purposes.

Rotation of cams'11, 11, ythus in clockwise direction bearing upon lateral trunnione 10, 10, causes hammer 3 Ito slide backward against the tension of spring- 7, until the trunnions aforesaid ride olf said cams at the points thereof. Spring 7 thus compressed,

instantly shoots stem 4 and hammer 3 foriac l isc `ing `this time water This operation is repeated rapidly so long 4h as the main drive shaft 21 is rotated and durfor coolin and lubricating purposes may be permitted to flow in conduit 8 through the hammer stem, the hammer and the centrally perforated drill steel to its point of cuttino'. During this operation two others of equaI importance areV automatically performed, to wit: First, by agency of worm 21 u on drive shaft 19, power transmitting sha t 23, and

gears 27, 29, the chuck 28, and drill steel 39 are constantly rotated; and, second, byw

agency of the pilot arm or cam-finger 74, moving in unison with hammer 3 to which it is attached, the feed lever 70y is engaged and depressed with each advance stroke of the hammer, and therefore with each cut of the drill steel, causing a partial rotation of ratchet wheel 61, the feed shaft sections 53 and 52, gears 51 and 50, 4and feed screw 47, thereby advancing n ut 48 and consequently the entire drill carriage in exact accordance wit-h requirements. And it will be particularly noted that such automatic advancementfof the drill carriage and drill steel is governed by the depth of cut resulting from each blow of the hammer, but where working conditions make necessary ,or advisable, an abnormally deep cut with each blow of the hammer, as for instance in relatively soft materlal; or on the contrary, when a more limited advance of the drill steel is desirable, as incase of unusually hardrock.

formation, vided for tion of the parts.

While the construction and arrangement of parts hereinbefore described and illustrated bythe drawings forming part of this application represents the preferred embodiment of the present invention, it will these extreme conditions are pro-v by the novel and eiiicient operaadjusted lever 62 and correlative be quite obvious to persons skilled in the j art to which it relates that various changes in form, size, proportion and details of construction may be made and substituted. for those herein set forth Without in the least departing from the spirit of this invention, or sacrificing the advantages thereof.

, Having thus described my present invention what I now claim and desire to "secure by Letters Patent is:

1. In a `rock drill the combination with a drill-steel, of a chuck for holding said steel, -a hammer for driving the steel, a' main driving shaft, means for actuating saidhammer operatively connected with the mam shaft,

' a power transmitting shaft, worm gearing connecting said shafts, a driving ar upon said transmitting shaft, and a driven gear, surrounding the drill chuck for rotating the same by engagement with said driving ear.

2. In a rock drill the combination with a drill-steel, a chuck for holding said steel, a ammer, a main drivingI shaft, means for actuating said hammer operatively connected with 'the main shaft, a power transmitting shaft Worm gearing connecting said shafts, a driving gear upon said transmitting shaft, a driven gear surrounding the drill chuck for rotating the same by engagement with said driving gear, and a drill Vcasing having compartments for inclosing all of the gears aforesaid.

3. In a rock drill the combination with a drill-steel, a chuck for holding said steel, a hammer, a main driving shaft, means for actuating said hammer operatively connected with the main shaft including a cam shaft upon the opposite side of said hammer from the driving shaft, a power transmitting shaft,- worm, gearing connecting said shafts, a driving gear upon said transmittin shaft, 'and a driven gear surrounding the drill chuck by enlgagement with said driving gear.

' 4. n a rock drill the combination with a drill-steel, of a chuck for holding said steel, a hammer, a main driving shaft, means for actuating said hammer operatively connected with the main shaft, a power trans- .mitting shaft, a Worm coaxial with the main driving shaft, a worm-gear meshing with said worm and mounted upon said trans mitting shaft, a driving gear also upon the latter shaft, and a driven gear carried by the drillchuck for rotating the same by engagement with said driving gear.

5. In a rock drill a; reciprocating drillactuating .element in combination with a cam movable with said element, a feed mechanism, a shaft for actuating said feed mechanism, a ratchet wheel on said shaft, pawl mechanism actuated by said cam for rotating said ratchet wheel, an adjusting lever pivotally mounted on said shaft, an element carried by said lever and connected with said ratchet wheel for preventing retrograde movement thereof, and means for holding the adjusting lever in predetermined positions.

6. In a rock drill a reciprocating drillactuating element in combination with a cam movable with said element, a feed mechanism, a shaft for actuating said feed mechanism, a ratchet wheel on said shaft, pawl` mechanism actuated by said cam for rotating said ratchet wheel, an adjusting lever pivotally mounted on said shaft, a pawl carried bythe adjusting lever engaging said ratchet wheel for preventing retrograde movement of the latter, and means p mechanism, a telescoping actuating -neeaatv mined positlons., p

7. lln 'a "rock drill a reciprocating. drill- Iactuating' element in comblnation with a cam movable .with said element,l a iced mechanism, a shaft for actuating `said feed mechanism, a ratchet heel-on said shaft, pavvll mechanism actuated' by said cam for rotating said ratchet wheel, an adjusting lever plvotally-mounted on said shaft, an element carried by said With said ratchet Wheel for preventing' retroade movement thereof, and a bracket pro`- jecting from the drill casing for holding the adjusting lever in predetermined positions.

8. lin a rock drill a reciprocating drillelement in combination With a cam movable with said element, a feed shaft tor actuating 'said feed mechanism, aratchet. Wheel on said shaft, pavvl mechanism actuated by said cam for rotating said ratchet Wheel, an adjusting lever pivotally mounted upon the advance end of said shaft, an element carried by saidlever and engaging said ratchet vvheel tor preventing retrograde movement lever and connected thereof, and means for retaining the adjusting lever in predetermined positions.

9. A rotatable chuck for drill casings comprising in combination an outer cylindrical chuck member, ,ber reciprocally mounted Within said outer member and adapted to rotate therewith,

430 an inner chuck mema compression spring interposed between l shouldered surfaces upon both chuck members, and a perforated closure for the rear end ont said outer chuck member. f

10. A rotatable chuck for -drill casings comprising in combination an outer cylindrical chuck member, an inner chuck member splined Within said -outer member and adapted to reciprocate therein, a compression spring interposed betvveen said relativelymovable chuck members, and a centrally erforated'screvv closure for the inner en of said outer chuck memberlin testimon whereof l affix my signature, in presence o tvvo subscribing Witnesses.

.f JAMES C. WRlGH'l. Witnesses:

Grnoncn W. lDtawns, n @tren L. S'rannmu.

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