US1163712A - Drill-rotating mechanism for percussion-hammers. - Google Patents

Description

E.-L. UPSON & H. w. PLEISTER. DR ILL ROTATING MECHANISM FOR PERCUSSION HAM q MERS. APPLICATION FILED APR. 3. 1913. 1,163,712.

Patented Dec. H, 191:3.

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EDWIN L. UPSON, OF BROOKLYN, NEW YORK, AND HENRY W. PLEISTER, OF WEST- FIELD, NEW JERSEY, ASSIGNORS TO HENRY B. NEWHALL, 0F PLAINFIELID, NEW

JERSEY.

iDBILL-ROTATING- MECHANISM FOR PERCUSSION-HAMMERS.

Application filed April 3, 1913.

To all whom it may concern:

Be it known that we, Enwrx L. UPSON, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, and HENRY \V. PLnis'rEn, a citizen of the United States, residing at'Westfield, in the county of Union and State of New J erse have invented certain new and useful Improvements in Drill-Rotating Mechanism for Percussion-Hammers, of which the following is a specification. I

Our present invention relates to an 1mprovement in cutter or drill rotating mechanism as applied to percussion hammers of the type described in our co-pending application, Serial No. 719,735, filed Sept. 11, 1912. One important advantage of the application of this rotating means to percussion drills of the above noted type, is that the cutter or drill is rotated a certain predetermined amount simultaneously with each reyolution of the cam disk, thereby increasing the. elliciency of the cutting or boring capacity of the tool when in use as a. rock drill.

In the accompanying drawing, Figure 1 is a sectional view of a portion of our device taken on the line ll of Fig. 2; Fig. 2' is a sectional view taken on line 22, Fig. 1, looking in the direction of the arrows; and Fig. 3 is a sectional view on line 3-3, Fig. 1.

In Figs. 1 and 2 there is shown enough of the important elements of .our device to indicate the application of the improvement. The cam or actuating disk 8 is rotatably mounted-upon a main bearing shaft 2, which is suitably, supported in a housing 3, and which is shown broken away in Fig. 2. The said housing has a tubular extension 4 in which is arranged a reciprocating cylindrical hammer 5. The said hammer has at its upper end a slot 6 which is arranged in such a manner as to be in the path of the cam extensions 7 that are arranged on the rotating disk 8, and as the said cams 7 pass through the said slot they cause the hammer to be lifted upwardly. When the said cam has left the slot, the hammer is then free to be forced downwardly under the tension of a spring member 9, which is in engagement with the upper end of the said hammer at one end and attached to a portion of the housing Wall, as at 10, at its Specification of Letters Patent.

Patented Dec. id, 1915.

Serial No. 758,656.

other end by such suitable means as a Stud 11, as lndicated in Fig. l.

Arranged at the lower end of the tubular extension -l is a suitable collet or chuck 12' end of this chuck 12 is flanged as at 15 and is in rotatable engagement with the walls of the chamber 16 formed at the lower end of the extension l. A. threaded lock-nut or bushing 17 is arranged. in such a manner in the lower part of the extension 4 as to maintain the said collet 12 in operative alinement with the hammer 5 and at the same time permit a slightly limited motion therein, as indicated by the clearance 18.

An extension of the aperture 13 at the upper end of the collet 12 is arranged in a tapered rectangular manner as indicated at 19, to engage with a square faced tapered shank portion 20 of a driving shaft 21 which extends down through. the center of the ham mer 5, the upper end of the said shaft being suitably mounted for rotation in a bearing block 22, said shafthaving arranged adjacent the said block a driven bevel gear 2;}, and on the opposite side of said bearing a taining collar 2l. It will be noted tha the shaft- 2 is formed in such a manner as to be an extension of the said bearing block 22, as indicated in Fig. 3, and at the end opposite to the said shaft, is arranged a threaded stud portion 25, so that in assembling the hammer the said bearing supports'the rotating disk 8 and the drill rotating shaft 21 in proper working alinem'ent by reason of being attached to the back wall of the housing 3 by means of thesaid threaded stud portion and a lock-nut 26. Arranged on the said driving disk, 8, either cast or otherwise secured thereon, is a driving bevel gear 27 corresponding with and adapted to drive the driven gear 23, and as indicated in Figs. 1, and 3, this bevel gear is in driving engagement with the first mentioned bevel gear 23, so that when the disk 8 is rotated by a hand crank or any other suitable means, not shown, but which may be suitably affixed to the hub portion 28 of the said disk 8, the shaft 21 is caused to rotate and at the same time the hammer is retracted and released by the cams on the said disk 8,

thereby slowly rotating the drill and at the same time causing the hammer to operate to strike the drill through its attached holding bushing or collet 12., p

In use, the tool is pressed against the work and the shaft 21 and chuck 12 are angularly firmly engaged, and rotate as one piece; but whenever a blow is struck they are slightly separated by the advance of the chuck and tool and the recoil of the housing 3 and shaft 21. If the taper of the engaging chuck socket and shaft head be suflicient, such separation gives to the chuck and tool therein a dwell sufficient to cause the said tool to function properly. It will be noted that such tapered engagement has the practical utility of an intermittent gearing between the cam disk and the chuck; and that the shaft 21, owing to its being held in alinement by the bushing 12 and the bearing block 22, acts as a slide bar and guide for the reciproeating hammer member 5.

While not necessary, it is sometimes desirable to have the intermittent stop period coincide with the moment of impact of the hammer with the cutting drill which obviously can be accomplished by changing the timing of the angular head 20, the portion 19 of the collet l2, and the gears 23 and 27 relative to one another. It is also advantageous, in cutting stone, to arrange that the degree of rotation of the drill varies each revolution in such a manner as to preclude, in the well known type of four lipped drill, the striking of the drill points at the same position at each revolution which likewise can, with facility, be accomplished by prop-' erly changing the timing of the angular head 20, the portion 19 of the collet 12, and the gears 23 and 27 relative to one another. This latter arrangement, in other words, would cause the drill to cut at a different angular degree in the second revolution than it did in the first revolution, and this change of cutting contact is progressive or retrogressive accordingly as the drill makes more'than a complete rotation or less than a complete rotation between successive hammer impulses.

The above noted change of cycle of drill may be regulated by having different pitch diameters of the operating gears, as in hunting tooth gears, and as may be ascertained by comparing those (23 and 27) shown in Fig. 2. For instance, as there are six cams on disk 8, there might be twelve teeth on gear-23, and only eleven teeth on gear 27.

i This arrangement would therefore cause the loss of degree of revolution of the drill equal to onetooth each revolution. Conversely, if gear 27'had twelve teeth and gear 23 eleven teeth, the drill would be correspondingly advanced one tooth each revolution, and this differential variation of rotation would prevent the impact of the drill occurringat the same spot in successive revolutions.

Having thus described our invention, we claim 1. A housing; a tubular extension thereof on a percussion axis and terminating in a chuck mounting; revolubly mounted with axial play therein, a tool-chuck formed with an axial, tapered engagement socket; a'hammer operable in said extension to strike said chuck, means for intermittently retracting said hammer, a shaft rotatably mounted in said housing and thereon a tapered, terminal head adapted to engage and rotate said chuck; a gearing operably connecting said shaft and retracting means to rotate said chuck. v

2. A housing, a tubular extension thereof terminating in a chuck mounting, a toolchuck revolubly mounted in said housing with axial play, a hammer operably mounti ed in said .extension to strike said chuck,

means operatively connected to intermittently retract said hammer, means for maintaining a chuck-striking tension on said hammer, a shaft revolubly mounted in said housing, gearing connecting the upper end of said shaft with said retracting means, and an angular head at the lower end of said shaft, there being an angular socket in said chuck to be engaged by said angular head by means of which the chuck will be rotated by said shaft.

3. A housing, a tubular ext nsion thereof and terminating in a chuck mounting, a toolchuck revolubly mounted in said housing, a shaft extending through'said housing, a

tubular hammer operably mounted in said extension to strike said chuck, means loosely mounted on said shaft and operatively connected to intermittently retract said hammer, means for maintaining a chuck-striking tension on said hammer, a second shaft extending through said tubular hammer and which the chuck will be rotated by said second shaft.

. EDWIN LUPSON. HENRY w. PLEISTER.

. Witnesses: FRED. J. Dona,

Jomv Mourns.

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