US1731010A - Tube drill - Google Patents

Description

Oct 1929. A. R. KRAUSE ET AL 1,731,010

TUBE DRILL Filed July 5, 1927 2 Sheets-Sheet l 4 firm,

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Oct. 8, 1929. A. R. KRAUSE ET AL TUBE DRILL Filed July 5, 1927 2 Sheets-Sheet 2 1\ i I! 5, I? 27.

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Patented Oct. 8, 1929 UNITED STATES PATENT OFFICE ARNOLD R. KRAUSE AND HOWARD O. HUTCHENS, OF EAU CLAIRE, WISCONSIN,

ASSIg-NORS TO GILLETTE RUBBER COMPANY, OF EAU CLAIRE, WISCONSIN, A COR- PORATION OF WISCONSIN TUBE DRILL Application filed July 5, 1927.

This invention relates to'a tube drill or rotary punch for perforating the valve stem hole in automobile inner tubes.

It is an object of this invention to provide an improved machine of the class described wherein positive means are provided for ejecting the cut out rubber discs from the in terior of the punch. In leather and paper punches, the discs are allowed to accumulate in the hollow joint of the punch until a sufficient number are present to force the uppermost discs out through a side opening in the punch. lVith rubber punches, however, the side outlet in a rotary punch is undesirable as well as causing trouble due to the sticky and elastic character of the discs which are compressed at each stroke of the punch, and are as apt to stick in the punch and expand downwardly upon the return stroke as they are to move upwardly and out through the side outlet. In practice, the use of such a punch requires frequent stoppages to clear the punch and it is accordingly an object of this invention to provide a mechanical ejector for the cut discs which operates on the return stroke of the punch.

It is also an object of this invention to provide means for feeding a cutting or lubricating liquid to the point of the punch to assist in the cutting operation and prevent sticking of the tacky cut surfaces.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings.

This invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

011 the drawings:

Figure 1 is a side elevation of a machine embodying the features of this invention.

Figure 2 is a front elevation thereof.

Figure 3 is a top plan view of the machine.

Figure 4 is an enlarged section on the line IV-IV of Figure 3.

Figure 5 is a fragmentary detail section of the lubricant feeding means for the punch.

As shown on the drawings:

The apparatus comprises a pedestal 1O supporting a column 11 near the top of which Serial No. 203,315.

are secured collars 12 and 13, collar 12 Sup porting an outstanding arm 14, the outer end of which carries an inserted crowned head plug 15, preferably hardened, which serves as an anvil for the punch or drill to be described hereinafter.

The collar 13 forms part of a double armed bracket, the rear arm 16 of which forms a shelf for a motor 17 which drives the rotary cutter pulley 18 by means of a round belt 19. The drive is shown as a right angle drive in order to provide for belt alignment during the vertical movement of the cutter pulley 18.

The front arm 20 extends above and parallel to the anvil arm 14 and is forked at 21 on the outer end in alignment with the anvil plug to receive a reciprocable sleeve 22 carrying a hollow punch spindle 23 journalled therein in ball bearings 24. The sleeve 22 is reciprocated by means of a fork ended lever 25, the forks 26 of which engage pins 27 carried by the sleeve. This lever 25 is pivoted at 28 to' the arm 20 and the other end is engaged by a link 29 connected to a foot lever 30, a spring 31 acting to pull the link downwardly to normally hold the sleeve 22 in its upper position.

The punch proper is indicated at 32 in F igure l, and is screwed into the end of the punch spindle in order that it may be replaced or sharpened readily by removal from the spindle, wrench flats being provided on both the punch and the spindle. Stripping fingers are shown in the figures to prevent the punched tube from moving up on the shank of the punch.

A belt guard 34 is mounted on the arm 20 to cover the pulley 18, the mounting for this guard also securing a bracket 35 in place above the hollow punch spindle. A rod 36 is secured in this bracket and extends down through the spindle 22 and punch 32, the lower end of the rod terminating just within the edge of the punch so that on the return stroke of the punch, the cut plug carried therein is ejected by the stationary rod 36. An inclined funnel 37 is mounted in the bracket 35 with the tip 38 of the funnel closely ad acent the rod 36 to deliver fluid thereto. A container 38 for cutting. and lubricating liquid is supported by the column 11 and feeds into the funnel 37 through a valve 39.

The oneration of the machine will be easily understood from the foregoing. The operator slips one end of an unspliced tube over the anvil arm 14 and depresses the foot lever, forcing the rotating punch into the tube. On

the return stroke of the punch the rod 36 pushes the cut plug out of the punch.

1 We are aware that many changes may be 0 made, and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and We therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

WVe claim as our invention:

1. In combination, i-n-a device for forming valve stem holes in inner tubes, a support injcluding an elongated arm arranged to re- \ceive an inner tube thcreover, a crowned element connected to an end of said arm formed to serve as an anvil, a rotary cutting tool above the anvil, and means for depressing the tool so as to bring it. into contact With the portion of the tube disposed on said anvil to cut a valve stem hole in said portion.

2. In combination, in a device for forming valve stem holes in inner tubes, a support including an elongated arm arranged to receive an inner tube thereover, a crowned ele ment connected to an end of said arm formed to serve as an anvil, a rotary cutting tool above the anvil, means for depressing the tool so as to bring it into contact with the portion of the tube disposed on said anvil, and an independent rod extending into said tool and arranged to force and remove rubber blanks from the tool on the return movement of the tool.

In testimony whereof, we have hereunto subscribed our names.

ARNOLD R. KRAUSE. HOIVARD O. I-IUTCHENS.

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