US270977A

US270977A - Auger

Info

Publication number: US270977A
Authority: US
Publication date: 1883-01-23
Anticipated expiration: 1900-01-23

Description

(No Model.) 7 V I. T. PAYNE.

AUGER. No. 270,977. Patented Jan. 23, 188.3.

' UNITED STATES PATENT Orr-ice.

IRA T. PAYNE, OF ESSEX, CONNECTICUT.

AUGER.

SPECIFICATION formingpart of Letters Patent No. 270,977, dated January 23, 1883.

Application filed October 24, 1882. (No model.)

To all whom it may concern:

Be it known that I, IRA T. PAYNE, ofEssex, in the county of Middlesex and State of Connecticut, have invented certain new and useful Improvements in Double-TwistAuger-Bits and I do hereby declare that the following is a full and exact description thereof.

I have devised a construction of'auger-bit which offers all the ordinary advantages due to the best constructions known, and is superior thereto, inasmuch as the manufacture is conducted with less difficulties and may be carried on at less expense than heretofore.

The object of the invention is to provide near the cutting-edgesa peripheral surface or lead of largely increased area, so as to steady the anger in its operation, particularly when deep holes are to be drilled in wood of unequal hardness from knots or other cause, where there is danger of the hole being deflected and the auger being crooked out of shape and broken. I extend the floor-lips at the proper inclination farther backward than has been done heretofore, or, rather, I increase the thickness of the twisted blade near the extremity in such manner that the floorlips reach much farther backward than would be the case if the same floor-lips were formed in a twisted blade of the ordinary thickness.

The accompanying drawings form a part of this specification, and represent my improved auger in what I consider its most perfect form.

Figure 1 is a side elevation, and Fig. 2 an end view. Fig. 3 is a section on the line 8 s, Fig. 1. Fig. 4 is a section on the line t t, Fig. 1. Fig. 5 is a section on the line u a, Fig. 1.

Fig.6 is a section on the line a v, Fig.1. Fig.

7 is a diagram representing one of the circunr ferential edges of the twisted blade at and near the end of the auger developed in a plane, instead of being wound helically around the cylinder.

Similar letters of reference indicate corresponding parts in all the figures.

A is the pod or twist of my anger. The metal near the cutting-edges B B is considerably thickened on the lower surface of each of the two helical grooves, as represented at A. The cutting-edges B B are formed by the junction of the upper surfaces, a, of the helical blade with inclined planes or floor-lips a, said floor-lips forming the bottom surface of the portion A, having increased thickness. This increased thickness A may be quite abrupt at the rear end, dropping perpendicularly or with a very slight inclination or curve from the general .helical surfaces, as shown at M. The rear edge of the floor-lips, or the line of junction of the floor-lip with the offset, also may be sharp; but I prefer to slightly round them off. I

C C are spurs serving the ordinary function to circularly incise the wood previous to the cutting'off or lifting of the chips by the cutting-edges B B. These spurs C 0 drop from the planes of the floor-lips, and are preferably, for convenience of manufacture, formed Straight on their inner surfaces.

I am aware that previous to my invention auger-bits have been constructed in such manner as to offer considerable guiding-surfaces ot' the lead near the cutting-edges; but in doubletwist angers it has always been considered necessary to preserve the general surface of the helical grooves as near as possible up to the cutting-edges, and the removal of the metal in such manner as to simply prolong the spur backward to form the guiding-surface, while the general surface of the helical grooves is attended with great labor and necessitates expensive machinery.

I am also aware that in double-twist angers with a single cutting-lip the result sought for by my invention has been obtained in some measure by simply not continuing the idle or inoperative groove clear up to the extremity; but in that case, aside from the objection that such an augeris aless perfect tool than a doubletwist auger, the increased guiding-surface is obtained only on one side, and that opposite to the cutting-edge. I attain the result by greatly increasing the thickness of the entire twisted blade on the lower side near the extremity. This feature involves no expense, as such increased thickness is formed in the manufacture of the drop-forging from which the anger is made. The only increased labor required in the manufacture of my tool consists in the formation of floor-lips of larger area than those of ordinary angers; but such floor-lips may be'a-nd preferably are perfectlyplane surfaces, and may be very rapidly formed by filing or by suitable machinery. The inner surfaces of the spurs O C may also be finished by the file or other tool at the same time with the floor-lips.

My experiments indicate that the increased area of the floor-lips does not interfere with the efficiency of the tool, while the floor-lips permit the formation of relatively very large circumferential guiding-surfaces near the extremity without increasing the labor or expense of the manufacture.

I claim as my invention- The double-twist auger-bit described, havingthe thickened portions A, terminating with the offsets a each offset being nearly over the opposite cutting-edge, B, so as by the broad cylindrical bearings presented at the periphery to afford great lateral guiding-surface, and. requiring only small spurs 0, all substantially as herein specified.

In testimony whereof I have hereunto set my hand, at New York city N. Y., this 7th day of October, 1832, in the presence of two subscribing witnesses.

IRA T; PAYNE.

\Vitnesses: a

A. H. GENTNER, CHARLES R. SEARLE.