US400659A

US400659A - Auger

Info

Publication number: US400659A
Authority: US
Publication date: 1889-04-02
Anticipated expiration: 1906-04-02

Description

PatehtedApr. 2, 1889.

..D- Mm BE Gm 0 P 0% i Q 5 V 0 a M. 0 M O 0 W N WW NITED STATES PATENT Prion.

FRANK C. GERARD, OF SEYMOUR, CONNECTICUT.

AUGER.

SPECIFICATION forming part of Letters Patent No. 400,659,

dated April 2, 1889.

Application filed \T 11116 18, 1888. Serial No. 277,414. (No model.)

, ble, easily sharpened, and of minimum first cost, and which, moreover, shall be so designed as to bore very rapidly, to bore a hole at any angle without splitting the wood at starting, and to cut a perfectly-round hole upon the back of a board whether passed through straight or at any angle, the bit itself making a clean cut through, so that splintering and punching out at the back of a board are wholly avoided. No bit, so far as I am aware, has heretofore been produced which combines these several desirable qualities in such a simple and practical manner as my present construction, which was designed for the eX- press purpose of avoiding the various objections to different bits now in the market, and to produce in a satisfactory manner the sev: eral results required from a tool of this class.

In the accompanying drawings, forming part of this specificatiomFigures 1, 2,-and 3 are elevations of my novel bit, Fig. 1 showing the cutting-edge at the front and the cuttingspur at the back, Fig. 2 showing the cuttingedge and the spur at the right and left, respectively, and Fig. 3' showing the spur at the front, the cutting-edge being at the back; and Fig. 4 is a bottom plan view.

In making my improved bit I preferably so form and twist the pod as to produce two grooves of different widths, this for the reason that as I employ but one cutting-edge the chips must necessarily be carried out by one groove only. I therefore increase the size of this groove so as to avoid friction and insure free delivery of the chips.

1 denotes the shank; 2, the pod as a whole; 3, the delivery-groove, and 4 the leading-screw.

This leading-screw is made single, of rapid pitch, and with the taper upon the lower side of the thread, the upper side being straight,

as shown in the drawings. This is in order to give a firmer and stronger hold in the wood.

5 denotes the cutting-edge, which in practice is a continuation of the thread of the leadingscrew. The upper surface back of the cutting-edge leads directly into the delivery-groove. The under surface just back of the cutting-edge is made concave, as at 6, so as to make a thin cutting-edge, which may be readily sharpened at any time by a few passes of a file, and which will permit the wearing away of considerable of the metal without impairing the efficiency of the bit in the slightest. 7 denotes the cutting-spur, which is placed opposite to the cuttingedge. This cutting-spur is supported and strengthened by a floor, 8, formed by the solid metal of the pod at the beginning of the upper side of the delivery-groove, as viewed in Figs. 2 and 4.

It will be noticed (see Fig. 2) that the cutting-edge lies at a considerably lower horizontal plane than the .floor 8, which supports the spur, and, furthermore, (see Fig. 4,) that the front of floor 8 is cut away, as at 9, so that the entire front of the spur may be sharpened, making it cut clear to its base, as indicated in Figs. 3 and t. This spur is made to flare outward slightly in the usual manner, and extends downward below the cutting-edge, as shown in Fig. 2, so that in boring a perfectly-round chip is cut out by the spur in advance of the cutting edge. By cutting away the front of floor 8, as at 9, and sharpening the front of the spur clear to its base, I insure that in boring through a board a perfectly-round hole shall be made at the back and avoid all danger of the bit punching through and splintering the wood, no matter at what angle the hole may be bored, and by removing metal at the lower end of the pod opposite to the cuttingedgei.'e., raising the plane of floor 8, I avoid all friction, as the cutting-edge removes chips in forcing its way into the wood.

In use the laying out of the hole is all performed by the single spur upon one side of the bit, the cutting away of the wood is all performed by the single cutting-edge at the opposite side of the bit, and the entire removal of the chips takes place through a single delivery-groove leading back from the cutting-edge. The exact height of the plane of floor 8 at the base of the spur relatively to the cutting-edge is not essential, so long as sufficient metal is cut away to avoid any friction upon the wood, leaving the cutting-edge free to cut away the wood as fast as it is drawn in by the leading-screw.

Having thus described my invention, 1 elaim- 1. An anger or bit having upon one side of the leading-screw a cutting edge concaved upon its lower side, and upon the other side a cutting-spur sharpened to its base and supported by a floor, 8, cut away at the front, said spur projecting below the plane of the cuttingedge, and the plane of the latter being below the plane of floor 8, substantially as and for the purpose set forth.

2. An anger or bit having upon one side of the leading-screw a cutting-edge, and upon the other side thereof a cutting-spur supported by a floor, 8, cut away at the front, the entire front of said spur bein sharpened so that it will out to the base, as and for the purpose set forth.

An anger or bit having a leading-screw the threads of which are straight upon the upper side and inclined upon the lower side, a cutting-edge forming a continuation of the thread of the screw, and a euttin g spur upon the opposite side, the horizontal plane at the base of the spur being higher than the cutting-edge, as and for the purpose set forth.

4. A double-groove anger or bit having a pod twisted to form a deliverygroove wider than the other groove, a single cutting-edge at the base of the delivery-groove, and a single cutting-spin opposite to the cutting-edge, the plane at the base of the spur being higher than the plane of the cutting-edge, as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

FRANK C. GERARD.

Vitnesses:

E, J. KIMPTON, EDWARD E. HoLnnooK.