US513541A - Cutting-bit for drilling-machines - Google Patents

Description

(No Model.)

J.T;SNYDER. CUTTING BI'I FDR DRILLING MACHINES. No. 513,541.

Patented Jan. 30, 1894,

1 7 &

229161 (la/Ln 81156252" JOHN T. S -NYDER, OF LUZERNE, PENNSYLVANIA.

CUTTING-BIT FOR DRILLING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 513, 541, dated January 30, 1894..

' Application filed February 18, 1893, $erial No. 462.863. (No model.)

To aZZ whom it may concern.-

Be it known that I, JOHN T. SNYDER, a citizen of the United States, residing at Luzerne, in the county of Luzerne and State of Pennsylvania, have invented a new and useful Cutting-Bit for Drilling-Machines, of which the following is a specification.

The invention relates to improvements in cutting bits for drilling machines.

The object of the present invention is to improve the construction of the cutting bits shown and described in Patent No. 444,026, granted me January 6, 1891, and Patent No. 492,118, granted me February 21, 1893, to facilitate drilling by decreasing the friction at the bit, and to enable the side cutter to be readily sharpened without removing it or changing its position.

The invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings and pointed out in the claims hereto appended.

In the drawings-Figure 1 is a perspective View of a cutting bit constructed in accordance with this invention. Fig. 2 is a longitudinal sectional view, the center cutter being shown in elevation. Fig. 3 is a transverse sectional view. Fig. 4 is a detail perspective View of the side cutter.

Like numerals of reference indicate corresponding parts in all the figures of the drawlugs.

1 designates an auger having a tip 2, to which are secured, by a transverse bolt 3, a central cutter 4 and a reversible side cutter 5. The central cutter 4 is arranged in a slot 6 of the tip 2 and is provided at its inner end with a V-shaped notch 7, adapted to fit against a beveled portion 8 at the inner end of the slot, the portion 8 being oppositely beveled and preventing the central cutter turning on the transverse bolt 3. At a point intermediate of its ends and in advance of the opening 9 for the bolt 3, the center cutter is provided at its edges with lugs 10, Which fit against the opposite faces of the tip to relieve the bolt of strain. The front end of the central cutter is slightly twisted and beveled to provide a cutting edge 11; and it is cut away and beveled at 12 at the center or longitudinal axis of the central cutter in order to relieve that sidefrom friction and to obtain the same diameter of cut at one-half the friction, as only one side of thecentral cutter is employed.

The side cutter, which is secured to the tip by the transverse bolt 3, is provided with perforations 13 to permit an adjustment, and it is provided with inwardly curved end portions 14 having a pitch coinciding with the twist of the auger. This arrangement of end portions enables the side cutter to be continually sharpened without detachment by filing until the entire curved portions are Worn away, as each curved portion or any remaining part of the same will always lie in the proper position relative to the auger for cutting. I The side cutter, by following the twist of the auger or drill, may not only be advantageously sharpened Without removing it, but

its durability is also greatly increased as any portion of it will always present a beveled edge to the surface of a hole. The straight connecting portion 16 of the side cutter is pro vided with pairs of opposite lugs 17 to engage the tip of the auger or drill and take the strain from the bolt 3.

It will be seen that the operation of drilling is facilitated, and that the side cutter may be readily sharpened by filing from time to time until the entire curved portions are Worn away, without detaching it.

Changes in the form, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

What I claim is- 1. The combination of an anger having a straight longitudinally disposed edge at its outer end, a reversible and adjustable side cutter provided with a series of adjusting perforations and havinginwardly extending lugs arranged in pairs and receiving the straight edge of the auger between them, a bolt arranged in one of the perforations and securing the side cutter to the auger, and a center cutter, substantially asdescribed.

2. The combinationwith an auger provided at its front end with a slot and having an oppositely beveled portion at the inner end of the slot, of a center cutter arranged in the slot and provided at its inner end with a V- shaped notch engaging the oppositely beveled positely'beveled portion at .the inner end of the slot, of a center cutter arranged in the slot and provided at its inner end with a V- shaped notch engaging the oppositely beveled portionof the auger, said center cutter being provided with opposite lugs engaging the auger, aside cutter provided-with opposite lugs and having at each end an inwardly curved portion conforming to the twist of the auger and following the same, substantially as'described;

5. The combination with an auger provided at its front end with a slot and having an oppositely beveled portion at the inner end of the slot, of acentral. cutter arranged in the slot and provided at its inner end with a V- shaped notch engaging the oppositely beveled portion of the auger, a bolt securing the cutter to the auger, and the side auger, substantially as described.

In'testimony. that I'claim the foregoing as my ownl have hereto affixed my signaturein the presence of two witnesses.

JOHN T3" SNYDER;

Witnesses:

W. G. WEAVER, W. S. PARSONS.

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