US1186806A - Drill sharpener, die, gager, and former. - Google Patents

Description

C. L. LAWTON. DRILL SHARPENER, DIE, GAGER, AND FORMER.

APPLICATION FILED ocr.21, 191s.

Patented June 13, 1916.

2 SHEETSSHEET l- C. L. LAWTON. omu. SHABPENER, DIE, GAGER, AND FORMER.

APPucAnbnmw our. 21. I215.

I Patanted June 13, 1916 2 SHEETSSHEET 2.

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CHARLES L. LAWTON, OE HA NCOCK, MlIGHIGAIt.

DRILL SHARPENEB, DIE, GAG-ER, AND FORMER.

Specification of Letters Eatent.

Patented June 113, 1916.

Application flied October 21, 1915. Serial No. 57,157.

To all whom it may concern:

Be it known that 1, Cinema L. LAw'roN, a citizen of the United States, residing at Hancock, in the county of Houghton and State of Michigan, have invented a new and useful Drill Sharpener, Die, Gager, and Former, of which'the following is a specification.

This invention relates to means for sharpening rock drills and its objects is to provide a device whereby the proper Width of the bits of drilfs for any desired depth can be quickly and easily secured.

This invention consists, in combination with a pair of dies for shaping the bits of drills, of a novel adjustable gage whereby a proper width of the Wings of the bits of drills may be positively assured.

in the accompanying drawings, Figure 1 is a side elevation of a drill sharpening machine. Fig. 2 is a front elevation of the die blocks and my improved drill gage. Fig. 3 is a plan and Fig. 4 is a rear elevation of a die block. Fig. 5 is a plan of my improved drill gage connected to a die block. Fig. 6 is a view of the same device, partly in elevation and partly in section. Fig. 7 is a rear elevation of another type of die blcch'.

Similar reference characters refer to like parts throughout the several views.

The drills used on any particular piece of rock work or at any particular mine are usually all made of one size of drill bar. Where holes are to, be drilled more than about two feet deep, a series of drills are employed, the bits of each being slightly smaller in diameter than the preceding drill so that there may be no danger of any drill lodging in the hole. If these variations in diameter are too great, the hole will finally become unnecessarily small. It is therefore of. the greatest importance that the drill bits should be perfectly gaged, especially for hard rock work where drill bits wear very fast and are often changed. It is further very desirable that this gaging shall be absolutely mechanical so that no mistake can be made by the mechanic.

In the drawings, Figure 1 shows a common form of drill sharpener, consistin of a horizontal power hammer for upsetting the worn bits of the drill rod, and a vertical hammer for widening and then reducing the 5 wings of the bit to the exact width required.

The horizontal cylinder. 1 of the hammer is mounted on the bed 2, and the piston rod 3 carries a die block 4:. As the dr ll rods usually have a longitudinal bore for water, a pin 5 is mounted in the die block 4 to prevent the bore being closed when the rod is being upset. A notch 6 is formed in the front end of the die block to produce the cuttlng edges of the drills. The rod is firmly held between jaws 7 while being upset.

After the drill rod has been upset, it is removed from the jaws 7 and its bit placed in the groove 8 of the die block 10 the piston rod 12 end of the drill rod is is held by hand against the cross bar 15. This cross bar has an air passage 16 from which air is conveyed under pressure into the grooves 8 and 18 by means of small ducts 19 in order to blow out any scale or dust lying in the grooves before the drill is placed therein. When the wings of the bit have been fiattened suiliciently between the upper and lower dies, the bit may be placed in the shallow notch 20, where its corners alone receive the full force of the hammer.

After. being flattened, the drill bit is placed in the groove 18 of the lower die with its wings vertical and the upper die is brought down against the lower die, the bit entering the groove 23 in the upper die. will be clear from Fig. 6 that the width of the bit will be determined by its distance from the cross bar 15, and the device embodying the present invention perfectly regulates this distance and therefore the width of the bit.

Slidably mounted in the cross bar is a plunger or gager 25 having crossed notches 26 in its front end. This gager can he slid into the groove 18, as indicated in Fig. 6. Its rear end is slotted to receive a link 27 to which it is connected by means of a pin 28. A. lever 29 is pivoted on the pin 30 carried by a plate 32 and bracket 33 mounted on the anvil 34, and this lever carries a pin 35 that connects to the other end of the'link 27. A quadrant 36 is mounted on the plate 32 and its upper face is graduated. The lower face of the quadrant is formed with notches 37, as indicated in Figs. 1 and 6, to receive the tongue 38 on the resiliently mounted portion 39 of the lever 29. A pointer may be mounted on this lever. .When this lever is swung toward the lower die, the gager 25 carried by the head 11 on of the cylinder 13. The bit the die block 9, and beneath drill bits may be quickly obtained. Several rapidly delivered blows each are necessary to upset the drill bit, to flatten it, or to gage it, yet the entire process is, completed at one heating of the metal.

That portion of the die having the shallow notch 20 shown in Figs. 5 and 7 is often called a fuller or swaging die, and is of great importance in the forming of drill bits, especially the sloping sides that gradually round off in the central semi-circular notch 2-1. This notch positivelyprevents the closing of the hole in given the proper cutting'angle. The upper and lower dies are similarly formed'in this respect.

Where cross bits are to be sharpened, the die block shown in Figs. 3 and l may be employed. After being upset, one of the wings bit is placed in the groove 40' of a die of the 41, two wings.lying flat on the parts 42, whereupon the upper die acts upon them to flatten them. The drill rod is then given one quarter turn which presents the other two wings to the action of the dies. After the wings have been flattened, the drill rod is placed in the groove 43, whereupon the width of the bit is determined as above stated, the side grooves 44 receiving the wings not being gaged. The gaging plunger 25 will be adjusted as before stated.

The details and proportions of this gaging device may all be modified or changed by those skilled in the art without departingi'rom the spirit of my invention.

I claim: 1. The combination of relatively stationary and movable rock-drill dies having directly opposed working faces provided with grooves having inclined bottoms,

able gaging device mounted in one of said grooves against which the drills may be' pressed, means for moving said gaging deopposed faces, the drill steel while] the corners of the bit are being flattened and and a slidand a graduated bar whereby the position of the gaging device may beproperly determined.

2. The combination of relatively movable dies having opposed working faces provi with grooves having inclined bottoms, and a slidable gaging device movable independently of the dies in said grooves.

3. The combination of relatively movable dies having grooves in their opposed faces, and a slidable gaging device movable in one of the grooves. I

4. The combination of relatively movable dies having grooves in their opposed faces, 'a gaging device slidable longitudinally of one of the grooves, a lever to slide such device, and a quadrant to position the lever.

5. The combination of a stationary die and a movable die having grooves in their a plate and a graduated quadrant rigidly mounted adjacent the stationary die, a lever pivoted to said platc and adjustably held in position by said quadrant, a gaging device slidably mounted for movement in the groove in the stationary die, and means connecting the gaging device to said lever.

6. The combination of a stationary die and a movable die having grooves in their vice to proper position,

' opposed faces, the bottoms of said grooves inclining in opposite directions, a plate and a notched quadrant mounted adjacent the stationary die, a lever pivoted to said plate, means mounted on the lever to engage notches inthe quadrant to hold the lever in.

predetermined position and a gage bar connected to said lever and extending into the larger end of said groove to determine the operative length of said dies.

7. Swa ing dies for drill rods consisting of oppose members having registering depressions, each provided with sloping sides that gradually round oif in a central semicircular notch.

8. A swaging die for drill rods provided with a depression having a fiat bottom and inclined sides, one of the sides being formed with a central semi-circular notch.

In testimony whereof I sign this specification.

CHARLES L. LAWTON.

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