US965474A - Rock-drill. - Google Patents

Description

E. M. MAGKIE a. P. P. DOYLB.

Patented. July 26, '1910.

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ROOK DRILL.l APPLICATION FILED JAN. 19,

E. M. MACKIE & P. F. DOYLE.

* :110011 DRILL. PPLIoA'rIbN' FILED 11111 1 '1m Patented Ju1y 26, 1910.

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` for efective work, to increase the drilling or with the air which the operators have to 4a pump in pumping ROCK-DRILL 965,474. Specification of Letters' Patent.

Application :filed January 19, 1909. Serial No.

To all whom 'it may concern: f'

Be it known that we, EDWIN M. MACKIE and PERcivAL F. Dorm, both residing at Franklin, Venango count Pennsylvania,

our invention; Fig.' 2 a front elevation thereof; Fig. 3 a section on the irregular line 3`3 of Fig. 1; Fig. 4 an elevation of the rear portion of the drill piston and a part the forme-r being a citizen of the United of the rifle bar, the same being on a larger States and the latter 2 Clt'lZGIl 0f the D O- scale than the preceding figures; Fig. 5 a minion of Canada, have invented certain @goss-Section 0n the line 5 5 of Fig 4; Fig,-

new and useful Improvements in Rock- Drills, of which the following isa specication.

Our invention relates to rock drills and the object thereof is ,to provide novel and efficient means incorporated therein for supplying water or air and water to the drill steel, the fluid being discharged through such drill steel for several purposes as for instance to thoroughly clean the hole of cuttings, to keep the cutting end of the steel coolthereby enabling Iit to ret-ain its temper and so keep its cutting edges in condition 6 a slde elevation of one of the' packing rings Fig. 7 an edge elevation of suchpackmg ring with a portion thereof. broken away; and Fig. 8 a detail of a modification.

Referring to the present embodiment of our invention as illustrated in the drawings, the rock drill elements are for the most part of the usual andwell-known construction so that it will be necessary to refer only to those parts-thereof which are directly con` cerned or affected by the'incorporatin'g of our invention therein.'

Referring to Fig. 1 the cylinder lis provided with the usual piston chamber within 'which reciprocates the piston 2 having at its front end carrying at its outer end a chuck 4 containing-a suitable bushing 5. As'usual the rear end of the piston is provided with a central bore 6 to receive the rifle or rotating bar A7 adapted to coperate with the riiie bar nut 8 screwing into a counterblore in said central bore 'o r chamber 6 of the piston. The eX- treme rear end of the iston is provided with suitable packing-1n the present instance a cupleather packing 9 beingemployed together with a packing retainer 10 screwing upon the reduced diameter of the rifle bar 4nut as clearly indicated in Fig. 4. The riiie bar coperates in the usual manner cutting powerof the machine by enabling the cutting end of the steel to strike on a clean fresh surface at leach blow7 to keep the hole free. from mud 7. thereby making the rotative eort easier and-so increasing the speed ofthe machine, and also to prevent dust or grit from the drilling mixing breathe, thereby saving them from the danger of contracting what is known as minl ers7 phthisis. In practice we provide for both an intermittent iiuid service or a oo ntinuous uid service and also provide for the mixture of the fluids referred to or the use ofeither one of such fluids although it is preferred to' employ Water either alone or mixed/With airvexcept where the supply is scarce in which event air alone may-- be em,-I` ployed.

In the preferred embodiment of our inratchet slip ring 12, said latter parts being held in place by means of the upper or backliead 13. This back-head is provided Wit-h a 4cent-ral bore within which iserranged ilexible packing 14 for packing an extension of the rifle bar as hereinafter explained, such packing being provided with an adjusting ring 15 screwing into said bore. At the extreme rear end of the backhead and in communication with said bore-is formed a chamber 16 by mea-ns of a cap 17. vThe back-head 13 is provided with a supply passage 18 communicatin with the chamber 16 for supplying the uid through a sultable inlet pipe 19 to the drill steel in the manner hereinafter described and the cylinand arrangement is such that the rock drilling mechanism forms a cooperative part of the Huid service and serves substantially as the fluid through the drilling'mechanismend through the drill steel to the hole in which such steel is performing its Work. The various featuresof novelty and utility in our Construction will be apparent from the" description hereinafter given..

In the drawings Figure 1 is a central longitudinal section of a .rock drill embodying the piston rod or chuck rod 3` with a thrust ring 11- and also the usual.

Patented Jury 26,1910'.

vided towardits front with the usual .operating for admitting and refluid to and from oprler is provided ports' and passages`20 leasing the operating posite ends of reciprocating the same, such passages being controlled by the main valve 21 which is.op-. erated'by the rocker 22 in the lusual and well-known manner. y

The 'piston'rod or chuck rod 3 is' provided with a cent1-al fluid passage 23 adapted to communicate at. its spending central passage 24 in the drill' steel 25. As shown in Fig. 1 suitable packing 26 is arranged at therear end of the drill steel and interposed between the bushing -5 and the bottom of the socket formed in the front end 'of the chuck rod.` The piston 2 is prowith apacking 27 which in practice is a piston ring of leather. Between therifle bar and the inner walls of the chamber 6 is interposed a suitable pack-l ing 28 which by reason of the peculiar formitted froni'the supply pipe of the drill steel. .55

. taining ring 29.

- provided mation of th'erifle bar is correspondingly fluted -or riflcd. This packing-is of the cu leather type and as indicated' in the enlarge view, Fig. 4, the same is provided with a re- T his packing 28 is adapted to permit the fluid admitted back of the pistontopass by itbetween the rifle bar and the' walls of the chamber 6 and to enter the front end of such chamber when the pressure therein is less than the pressure behind the piston,'but to prevent the flow of fluid in the opposite dii'ection.

-In the present instance' the rifle bar has'a rearward extension 30' which extends into the cential bore yin the baclchead 18 which extension as well as the entire lfriiie bar is with a fluid passage 31. This extension. of the rifle bar is packed by means of the packing 1 4 hereinbefore lreferred to.

#Likewise the .ratchet ring 11` may be pro- For an intermittent service of water and air, water under suitable pressure is adany suitable valve mechanism not shown) to the chamber 16 from whence the water will flow through the passage 31 in the rifle bar to the rifle bar' chamber 6, thence through the passage 23 in the chuck rod and through the passage 24 to the front end Thus a communication is established for the passage of the fluid under pressure from the fluid passage 18 in the back-head to the front end of the drill steel, the -working parts of the drill through which the fluid passes being adequately and efliciently packed for the prevention of leakage of the fluid. Y

When the drill is in operation and with the water under pressure admitted to the back-head in the manner already explained,

the piston for the-purpose of and inasmuch as front end withI a corre-v `the -force to clean the hole.

19 (through steel becoming plugged up tlie sizeof the chamber 6 in frontof the rifle bar willbe increased. upon the outward stroke of the piston and the size of the fluid ports is such 'that such space will be increase-d faster than the fluid can fill it. "As a result the pressure in the chamber 6 will be reduced theinner or rear end of the piston chamber is filled with the operating fluid under a greaterl pressure than the reduced pressure in the chamber 6,-.aportion of the former pressure will pass bythe packing 28 which acts as a sort of acheckf'valve permitting a such pressure to pass forwardly along the wallsof the chamber G, but preventing tlie return thereof, Thereupon on the `inward s-troke of the piston, the chamber space in front of theyrifle bar'will be decreased and the pressure of the fluid therein will'be increasedby the continued rearward movement of the piston in the regular operation of the drill. is aV mixture of water and air inasmuch as the operating fluid of the drill is usually air, will be expelled forcibly through the passages 23 and 24 to the front end of the drill steel 25 and into the hole in whichthe steel is drilling, thereby cleaning out'- such hole with the attendant advantages hereinbefore recited.

For continuous water and air service, the' action will be the same, only instead of water alone being allowed to enter the supply pas 'sage 18, the greater portion of the fluid will be air, onlyenough water being mixed with it to prevent dust while the air will supply This method is to be used where the supply of water is scarce` By preference the packing ring 27 is made in two pieces as detailed in Figs. 6 and 7, such packing comprising the leather packing proper 27 which is kept in contact ,with the inner Walls of the piston chamber by a circular steel spring 27a, which construction of ring efficiently seals against 4leakage while on account of its absorbent qualities the leather becomes saturated with oil and so acts as a distributer of lubrication along its path in the cylinder 1.

The construction and arrangement described as well as thel freedom ofthe passages yto the drill steel are such thatno appreciable or detrimental back pressure is'created in practice but if desired a check valve As a result the fluid whichmightl be interposed at" any suitable point as 4rie bar chamber, a rifle bar therein, the

therein having at one `enter the rifle bar chamber but lliovvv in' the opposite pressure in the rie bar chamber which would eventually s to'p the machine andv posg sibiy burst the packings.4

" e claim:

l. In a rock drill, the combination of a cylinder having a piston chamber, a piston therein havin A. at one end a bore forming a rie bar cham er, a riile bar o erating therein, the piston being provide with a lonnitudinal passage `for lnid, and means ihr permitting' the working fluid to enter said passage from the piston chamber but preventing the flow in the opposite direction.

2. In a rock drill, the combination ofa cylinder having a piston chamber, a piston therein having at one end a bore forming a pistonV being provided with a passage for ind,.packing Abetween such bar and piston permitting passage of pressure fluid from-the piston chamber to the rifle bar chamber and to the passage in the piston but preventing How in the opposite direction, whereby the movement of the piston will cause forcible ejec-4 tion of Huid at the front end of the drill.

3. In a rockdrill, the combination of al cylinder having a piston chamber, a piston end a bore forming a rifle bar chamber', al rile bar therein, said bar and piston'having communicating Huid passages adapted to communicate with .a source of fluid, and means 'for permitting the pressure duid from the piston .chamber to preventing direction.

4. In a rock'drill, the combination of a cylinder having a piston chamber, a piston therein having at one end a bore forming a rile bar chamber, a rilebar therein, said bar and piston having c^mmnnicating Huid passages adapted to communicate with a source of fluid, and a uted cup packing interposed between the rifle bar and the piston.

5. In ya rock drill, the combination of a cylinder having a piston chamber, a piston therein having at one end a bore forming a rifle bar chamber, a rifle bar therein, said bar and piston having communicating fluid passages adapted to communicate With a source of fluid, a luted cup packing inter'-4 posed between the rifle bar and the piston, and a retaining rin 29 for such packing.

6. In a rock dri the combination of a cylinder having a piston chamber, a piston therein having at one end a: bore forming a rifle bar chamber, a rifle bar therein, said bar and piston having communicating fluid passages adapted to communicate with a source of fluid, a fluted cup packing interposed between the rifle bar and the piston, a thrust ring 1l ,for the rear end of said rifle bar and packing 32' to prevent leakage.

7. In a rock drill, the combination of a cylinder having a pistonchamber, a piston therein having at one end a bore forming a rifie bar chamber,

passages adapted to communicate with a source of Huid, said riile bar having a rearward extension, a head in whichthe'latter is mounted, packing for the extension, and packing between therilie bar and piston.

EDVIN M. MACKIE;v PERCIVAL F. DOYLE Witnesses: GRACE T. HOPKINS J, B. WILLIAMS.

a rifle bar therein, said l' bar and piston having communicating fluid

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