US1465008A - Rotation sleeve for drill bits - Google Patents

Description

W STEPHENS ROTATION SLEE E FOR palm. BITS 2 .n mm m n I s m u .W I 1 l lllrl I'ILII t atented Aug. 14, 11923.

UNHTED STATE 'WILLIAM STEPHENS, 015 IRONWOOD, IdICHIGAN.

RQTATJION SLEEVE FOR DRILL BITS.

Application filed. March 29, 1922. Serial no. 547,811.

To all whom it may concern Be it known that T, WILLIAM STEPHENS, a citizen ofthe United States, residing at Ironwood, in the county of Gogebic and State of Michigan, have invented certain whereby rotary movement is imparted to the drill bit as the drilling progresses. One object of the invention is to provide a construction whereby the external retainer now very generally employed upon drills to maintain the bit in alinement with the chuck may be dispensed with, and another object of the invention is to provide a construction which will guide the bit in its reciprocatory movements and will also prevent the bit being forced too far into the rotation sleeve. Other objects of the invention will appear incidentally in the course of the following description.

In the accompanying drawings, which illustrate my invention,-

Figure 1 is a view, partly in elevation and partly in vertical section, of a sleeve embodying my' improvements;

Fig.2 is a similar view showing the-drill bit in position within the rotatlon sleeve and showing the sleeve partly in section upon the line 22 of Fig. 1; o v Fig. 3 is a detail perspective View of the bit;

Fig. d is a transverse section on the line 44 of Fig. l with the bit in position;

' Fig. 5 is a similar view with thebit removed.

The sleeve 1 is fitted in the lower end oi the drill casing in the usual manner and is rotated intermittently by any of the means now generally employed for that purpose. The upper portion of the bore of the sleeve, indicated at 2, ma be smooth or may be provided with longitudinal grooves or given any other desired confi ration according to the characteristics of t e drill in which it is to be fitted. It will be understood that the hammer head reciprocates in the upper portion of the bore of the sleeve and the sleeve should be correspondingly designed.

At its lower end, the bore of the sleeve is constructed with two rad1al notches or grooves 3 which are arranged in allgn nt 'pass into said grooves.

and open at their inner sides into a central circular portion 4. The central circular portion of the lower end of the bore merges at its upper end into a recess or shallow chamber 5 formed in the wall of the bore and extending part way around the same, the chamber being duplicated at diametrically opposite points and each chamber having one vertical side alined with and communicatin with a notch or oove 3. Each cham or is further provi ed with an extenslon or notch 6 at its lower end midway between the two notches or grooves 3 and open to the central circular portion 4 of the bore. The construction described provides lugs 7 upon the wall of the lower portion of the sleeve at diametrically opposite points, each lug being located at the side of a groove 3 and beingiormed by one wall of said groove.

The bit comprises a shank 8 having a spiral blade 9 formed upon its outer portion and provided at its upper or inner end with diametrically opposite lugs 10, the portion of the shank between the lugs and the blade constituting a neck which, when the drill is in position within the sleeve, will fit within the circular portion 4: of the lower end of the sleeve. The blade is provided with abrupt shoulders 11 at its upper or inner end which form abutments adapted to engage against the lower end of the sleeve, as shown clearly in Fig. 2, whereby to limit the insertion of the drill into the sleeve.

When the drill is to be used, the upper end with the lugs 10 is inserted in the lower end of the sleeve with the lugs 10 engaging the grooves or notches 3. The drill is then pushed upwardly or inwardly within the sleeve until the shoulders 11 abut the lower end of the sleeve, it being understood that the said shoulders are somewhat wider than the grooves or notches 3 so that they cannot The insertion of the drill into the sleeve will bring the lugs 10 into positions in front of the respectively adjacent recesses or chambers 5, and the drill may then be given a quarter turn until the lugs 10 abut the sides of the respectively adjacent lugs 7 above the seats or extensions 6. If the sleeve be then rotated, as indicated by the arrow in Fig. 4%, the drill will also be rotated. When the drill has been given a quarter turn, as described, the lugs 1,0 will, be i alinement with the extension or seats 6 at the lower ends of the respective" chambers 5 and may seat in the same so 'that rotation of the drill relative to the alinement of the drill with the sleeve will be 7 maintained so that the usual retainers now provided upon the outer or lower ends of drills will be unnecessary.

It will be understood that, if considered desirable, the usual bumper spring may be provided around the lower end of the rotation sleeve, but I have deemed illustration of this spring unnecessary inasmuch as it is well-known in 'the art.

The construction of my sleeve is such that wear upon the bore of the same is very materially reduced and, consequently, the life of the sleeve is prolonged and the force required to rotate the drill is lessened.

Having thus described the invention, what is claimed as new is: v

1. In a drill, the combination of a rotation sleeve provided in its lower end with oppositely disposed longitudinally extending radial grooves and a central circular portion connecting said grooves, the sleeve being furtherprovided between the grooves with recesses, each communicating at one side with one of the grooves and having an extension at its lower end at its opposite side communicating With the central circular portion of the bore of the sleeve and closed to the groove, and a drill bit provided at its upper end with diametrically opposite longitudinally extending radial lugs adapted to engage in the grooves in the sleeve and pass longltudinally through the grooves to enter the respective chambers of the sleeve, the portion of the shank of the bit below said lugs being circular whereby to engage the circular central portion of the bore of the sleeve and rotate therein, the lugs moving within the recesses of the sleeve during such rotation whereby to aline with and seat in the extensions vat the lower ends of said recesses and one wall of a recess being flush with and merging into a wall off,"

a seat whereby to limit the rotary movement of thebit and the engagement of the lugs in the seats preventing rotary movement of the bit.

2 The combination of a rotation sleeve provided in its lower end with diametrically opposite radial longitudinally extending grooves and a central circular portion connecting the grooves, the sleeve being further provided with shallow recesses, each communicating with the inner end of one of the grooves and extending part way around the inner wall of the sleeve and having a seat in its lower end at the side remote from the groove, and a bit provided with a circular shank and with diametrically opposite lugs at the upper end of the shank, and a blade extending spirally around the lower portion of the shank, the blade presenting abrupt shoulders at its upper end wherebythe drill may be insertedln the grooves and partly rotated to bring the lugs into enagement with the seats in the sleeve, the width of the shoulders at the upper ends of the blade being greater than the width of the groove whereby the shoulders cannot enter the grooves but may abut the lower end of the sleeve.

In testimony whereof I afix m signature.

WILLIAM STEPHEN [1,. s.]

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