US944750A - Rock-drill. - Google Patents

Description

controlling devices as is generally the case.

WILLIAM CHARLES STEPHENS, or oonNwALL, ENGLAND,

nocK-DnILL.

Specification of Letters -Patent.

Patented Dec. 28,1909.

Application ined August 1, 190s. serial 110.446,450.

To all rwhom it may concer/n:

Be it known ,that I, WVILLIAM .CHARLES- STEPHENS, a subject of the King of Great Britain, residing` at Garn Brea, Cornwall, England, have invented new and useful Impro'vements' lin -or Connected with Rock- Drills,vof which the followingis a specification.

This invention relates to rock drills of the kind where.water is used for allaying the dust formed by' drilling andhas for its` object the provision of meanswhereby the supply of motive Huid for operating the drill and the supply of. water can be simultaneously controlled instead of using separate A further object is to provide against leakage where the drill bit enters its holder and to arrange for the easy extraction of the bit from the said holder.

According to the invention I rovide a I tap or valve which is formed with inlets and that when the said part ismoved the motive fluid and water will both be turnedpn or oit'.V In practice I so varrange the recesses that the water' is lturned on before the motive fluid in lorder to linsure the free flow of water before the drilling takes place. To prevent4 water leaking around the drill shank within the holder I provide a conical- To enable my'invention to be Afully under-- stood I will describe the same by reference to the accompanying drawing, in which Figure 1 isa longitudinal sectional elevation of a percussive' rock drill ofthe kind having an automatic air-feed as described in the specification of my application Serial blo-446,449 of even date herewith and provided with-my improvements. Fig. 21s a plan, and Fig 3 a sectional side elevation thereof. Fig. 4 is an elevation ofthe front i end thereof. Fig. 5 is a section on the'line 5-.-5, Fig. 4. Fig. 6 is a section on the 1ine- 6-, Fig. 2 and Figs. AII and 8 are respectively sections on the lines 7-7 and 8 8, Fig. 6. Fig. 9 is a similar View to Fig, 8

- 'showing a different position .of the parts.

a tool for removingthe drill bit from its holder. f

a is the main cylinder or hammer cylinder of the drill, b the piston thereof, and c the valve forcontrolling the supply ofmotive fluid to the said piston from the passage 01. thereof, d2 being the supply port therefor. e is the drill holder or bolster against which 'the hammer 'b operates and which carries and forms the support for thel hollow drill bit f and g is the central hole -in the bolster into which the water to supply the bit flows from the holes la., lz, in communication with the recess z' containing the grooved and perforated ring j. Allof Ithe said .parts were described in the said specification of even date herewith. Y

7c is the tap or cock for controlling the supply of' pressure Huid to the main iston :and feed piston and of water to the dr1ll bitf. This tap has inlets Z and m for the supply of the pressure fluid and water respectively. The plug ln. of the cock is formed with recesses o, p, the recess o being desi ed to connect the inlet Z with the port w ich is formed in one with the ports o1 an d2 for supplying the main and feed cylinders while the recess p is designed to bring the inlet m into communication with the passage 0' to the drill-bit The recess p is so arranged relatively wlth t-he recess o that when the plug a is turned slightly, when-starting the drill, the water supply is -iirst effected, the 'water passing to the cutting edges of the bit before the drill lcommences to work and thus insuring the free flow of water takin place before striking the rock to be drilled so that cut portions of rock are, prevented from choking the hole in the bit. By further rotation of the .plug ln, the .pressure fluid is then admitted to the cylinders aand d and the drill then commences to operate the water being full on. I also-provide a screw valve or regulator s in the inlet m so that the supply can be diminished.

t' is the conical hole whichv I provide in vthe holder or bolster e and u is thecorrespondingly shaped shank-on the bit-'fvhich 'when jammed back into'the hole #maires a iii-the ba f iid w,

d is the feed'cyhnder and d1 the piston,

wedge which Figs. 10 and 11 are views at right angles of the drill shank'. By a simple'tapwitha hammer the Wedgeforces the' collar away from the drill holder and so extracts the drill bit.

Although I have describedv my improvements in connection, with-a drill of the percussive type it will `be obvious that they can .be employed with other types of employing Water tofallay dust While: drilling.

Having now particularly described and ascertained the nature of my said invention4 and in what manner same is to be performed,

I declare that what I claim is In a rockdrill, the combination with the4 drill cylinder and iston, and a drill ybit holder provided Witl means for supplyin Waterfto the drill bit, ofa controlling coc casing provided with a Water inlet, a 'motive let operatively connected with the' cylinder nfor supplying motive fluid thereto, of a single cock in said casing provided With a passage for connecting the motive fluid in-A et and outlet, and a passage for connecting the water inlet and outlet, having a p0rtion ada ted to be brought into operativeposition 1n advance of the' motive iiuid' assage, whereby Water is admitted to the rill bit beforelthe Vvdrill is brought into operation, substantially as describ WILLIAM CHARLES STLBHENS.

. Witnesses: Y HOWARD Fox, W. H. DANIELL.-

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