No. 803,911. PATENTED NOW, 7, 1905, J. G. LEYNER. ROCK CUTTING BIT,

APPLICATION FILED SEP, 2, 1903,

S

s

UNITED STATES PATENT OFFICE. JOHN GEORGE LEYNER, OF DENVER, COLORADO. ROCKCUTTNG DRILLBT No. 803,911. Specification of Letters Patent. Patented Nov. 7, 1905, Application filed September 2, 1903, Serial No. 171,623, To cult livhon, it nually conce77: more may be used, but I preferably use eight, Beitknown that I, JoHN GEORGELEYNER, a as illustrated. This drill-bit is adapted to be citizen of the United States of America, resid attached to a suitable bar or rod 2 of steel, ing in the city and county of Denver and State which I term the 'drill-bar.’ This drill-bar of Colorado, have invented certain new and use corresponds to the shank portion of the com ful Improvements in Rock-Cutting Drill-Bits: mon form of a rock- that has its cut and I do declare the following to be a full, ting-point forged on one end of it, while its clear, and exact description of the invention, opposite end is adapted to be struck by a ham Such as will enable others skilled in the art mer. This drill-bar part of my rock-cutting to which it appertains to make and use the drill-bit is adapted to be used in any of the same, reference being had to the accompany rock-cutting engines in use or may be used as ing drawings, and to the figures of reference a hand-drill. The cutting-points are adapt marked thereon, which form a part of this ed to be practically instantaneously attached specification. and detached to and from the drill-bit and are My invention relates to improvements in designed to be used until their cutting-lips are rock-cutting drill-bits; and the objects of my worn dull and then be instantly removed and invention are, first, to provide a drill-bit pro replaced by sharp ones. vided with a larger number of rock-cutting The cutting end of the hub is provided with edges than the rock-cutting drill-bits in com a plurality of rock-cutting lips 3, which ra 75 mon use; second, to provide a drill-bit point diate from the center of the end of the hub that is made independent of its hammer-strik and extend beyond its peripheral edge. These ing drill-bit shank or bar and that is adapted lips are arranged at preferably equal distances to be detachably secured to and removed from apart, and they are arranged longitudinally a hammer-striking drill-bar especially made of the axis of the hub to form radial ribs that 25 to receive it; third, to provide an independ extend rearward on the hub from its cutting ent hammer-striking drill-bar and an inde end to close to the opposite or drill-bar-re pendent rock-cutting drill-bit that can be in ceiving end of the hub, where they blend or stantly secured to the independent hammer die out into the circumference of the hub. striking drill - bar, and, fourth, to provide Their cutting ends are beveled equally on each means for attaching and detaching said inde side to form a central edge which ex pendent rock-cutting drill-bit to said hammer tends from the center of the hub through the striking drill-bar. I attain these objects by radial length of each rib, and between the the mechanism illustrated in the accompany cutting edge of the ribs fillets 4 are formed. ing drawings, in which The ends 5 of these fillets slope outward and 9 O 35 Figure 1 is a front elevation of the drill-bit. downward to the center of the bit, as shown Fig. 2 is a rear end elevation of the drill-bit. in Fig. 6, and their ends are provided with Fig. 3 is a side elevation of the drill-bit. Fig. concaved recesses 6, as shown in Figs. 3 and 4 is also a side elevation of the drill-bit look 4, which form channels through which the ing at it from a different position than the rock-cuttings work away from the center of 95 view in Fig. 3. Fig. 5 is a sectional elevation the bit. These center fillets form the body of the drill-bit on line 55 of Fig. 1. Fig. 6 portion of the bit, from which the ribs radiate, is a sectional elevation of the drill-bit on line and these fillets are of sufficient diameter to 66 of Fig. 1. Fig. 7 is a side elevation of my allow a tapering axial hole 7 to be formed in improved rock-cutting drill-bit and hammer the hub from its rear end the greater portion OO 45 Striking drill-bar, showing the swage used of the length of the hub, thus leaving a suf to detach the drill-bit from the drill-bar. Fig. ficient thickness of metal between the bottom 8 is a perspective view of the drill-bit's driv of the hole and the cutting end of the bit. ing - off swage, and Fig. 9 is a longitudinal The bottom of this taper hole is preferably section of a hollow drill-bit bar. flat, and extending from it axially through the SO Referring to the drawings, the numeral 1 end of the bit I preferably form a small hole designates a short circular hub of metal 8, through which water or air or steam or a formed into a rock-cutting bit and embody watery fluid may be fed to the rock-cutting ing in itself an independent renewable attach edges of the cutter to wash or blow out the able and detachable rock-cutting point or drill rock-cuttings as fast as they are made by the I ICs 55 cutter while holes in rock. pluralitybit. One of end cutting-lips of this hub 3. is Fiveformed to teninto or a The taper hole in the rear end of the drill

2 803,911 bit is adapted to receive one end 9 of a drill Consequently the lugs 11 are not shown, as bar, which is tapered to fit tight round its they are not required, while the drill- bar circumference in the hole in the drill - bit. shown in Fig. 9 is a machine drill-bar-that This drill-bar is a straight bar of steel. Its is, it is adapted for use with a rock-drilling opposite end is adapted to be inserted in any engine, and the lugs are used to secure it to of the rock-drilling engines in use, or it may the rock-drilling engine. be used as a hand drill-bar and be struck by My improved drill-bit is made of superior a hand-hammer. I preferably provide this tool-steel and may be formed very quickly, drill-bar with an axial hole 10, which extends cheaply, and in very large numbers in hot O through it from end to end, as shown in Fig. metal drop-forging die-presses or by any other 9, although, if preferred, it may be made suitable duplicate forging method. They are solid, as shown in Fig. 7. When made solid, then properly tempered for rock drilling 75 it is especially adapted for use in the plunger work and are adapted to be shipped in kegs type of air-and-motor-operated drilling-en or barrels to mines, quarries, or railroad gines, as well as in the piston type of rock graders, with a set of drill-bars of different drilling engines in common use, and the ham lengths adapted to fit any type of rock-drill mer-striking end of the drill-bar, though illus ing engine the purchasers of the drill - bits trated straight and plain in Fig. 7, may be may use. - formed to fit the drill-holding mechanism of The large number of evenly-arranged rock any type of drilling-engine; but when made cutting lips I employ insures very rapid rock hollow it is especially adapted for use in the cutting, and they will wear very much longer air-and-water type of rock-drilling engines, without becoming dull than the forms of drill in which combined jets of air and water are bits in common use, while when dull they can forced through the drill-bit to its cutting be quickly replaced by sharp bits and can be 25 point to eject the rock-cuttings from the holes resharpened again many times by suitable in rock while drilling them, patented to me dies and tools. - September 16, 1902, No. 709,022. These Having described my invention, what I 90 drill-bars when used in my drilling-engines claim as new, and desire to secure by Letters are provided with oppositely-projecting lugs Patent, is 11 and 12 in order to adapt them to its drill 1. A drill-bit, comprising a cylindrical hub, holding mechanism, this form of drill-bit a series of radial cutters projecting from the being particularly adapted for use in water end of said hub, leaving intermediate, triangu 95 , as the channels in the face, end of the lar fillets, said cutters having their edges sub - fillets and between the ribs of the bit permit stantially in one plane, and a series of spaced, the water to flow freely between the cutting longitudinal ribs on the periphery of said hub, lips of the bit and wash away the rock-cut said ribs having parallel sides and being in tings as fast as they are made. alinement with and constituting integral, rear ICO Where it is preferred to use drill-rods and ward extensions of said cutters, and the rec drill-bits in drilling-engines or for hand-drill tangular hub-spaces between said ribs being ing without the use of water or air or a watery in alinement with said fillets. fluid to wash or blow out the rock-cuttings, 2. A drill, comprising an apertured bit and both the drill-bars and the drill-bits may be a tubular striking-bar, said bit having a taper made without the axial holes 8 and 10. The Socket and said bar having a taper end fitting drill-bits are quickly placed on the taper end said socket but not extending to its bottom, 45 of the drill-bar by a slight of the hand whereby said bit is frictionally held on said and will stick tight until the drill-bar receives bar but a continuous passage for fluid is pro a blow, which very rigidly secures the two vided, said bit comprising a cylindrical hub, IO together. A block of any suitable material a series of radial cutters projecting from the or a hammer or mallet is all that is necessary end of said hub, leaving intermediate, triangu to knock the drill-bit off from the end of the lar fillets, said cutters having their edges sub drill-bar. I preferably employ for this pur stantially in one plane, and a series of spaced, pose, however, a yoke-ended swage 13, as longitudinal ribs on the periphery of said hub, II5 shown in Figs. 7 and 8, which consists of a said ribs having parallel sides and being in hammer-striking handle-bar provided with a alinement with and constituting integral, rear 55 bifurcated yoke-shaped end that is adapted to ward extensions of said cutters, and the rec straddle the drill-bar and rest evenly against tangular hub-spaces between said ribs being opposite sides of the rear end of the drill-bit, in alinement with said fillets. as shown in Fig. 7. With this tool only a In testimony whereof affix my signature in slight tap of anything handy is sufficient to presence of two witnesses. knock the drill-bit from the drill-bar. JOHN GEORGE LEYNER. The drill-bar shown in Fig. 7 is a hand drill Witnesses: bar and is adapted to be held in one hand and CLARENCE A. LAWSON, be struck by a hammer held in the other hand. LUTHER. H. WYGANT, Jr.