USRE2146E - Improvement in augers - Google Patents

Description

R. JENNINGS.

. Wood-Auger. I

No. 2,146 Reissued Jan. 16. 1866.

UNITED STATES PATENT OFFICE.

IMPROVEMENT IN AUGERS.

Specification forming part of Letters Patent No. 12,318, dated January 30, 1855 Reissue No. 2,081, dated October 3, 1865; Reissue No, 2. 146,, dated January 16, 1866.

To all whom it may concern:

Be it known that I, RUssELL JENNINGS, of Deep River, in the county of Middlesex and State of Connecticut, have invented a new and useful Improvement in the Double-Twist Auger, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a p.1rt 01' this specification, and in Which- Figure 1 represents a side elevation of my double-twist auger. Fig. 2 is an end View of the same.

Angers, as usually constructed, are composed of two members, the cutting-bit, andthe pod, the latter acting to discharge the chips separated by the former. Thecuttingbit in double-twist angers has two radial cuttingedges or floor-lips extending from the pintle or screw to the periphery of the twisted pod. Each floor-lip is furnished at its outer corner with aspur or cutter, which, projecting in the direction of the axis of the auger beyond its cuttingedge, cuts round the periphery of the cylinder of wood removed by the floor-lips. The spur thus described, being at the outer corner of thefloor-lips, acts in conjunction with it, and angers thus constructed are very defective; first, because the spur is projected at the thinner partof the floor-lip, and to be useful as a cutter must be made too thin for durability and strength; hence it, together with the portion of the cutting-edge of the floor-lip, from which it is projected, is continually liable to break oft in using, and this liability to break is so great that angers thus constructed are considered unfit for boring hard wood. This contiguity of the cuttingedge of the floor-lip and the spur is also objectionable, because when the former is broken by boring against a nail or other hard sub stance there is no material in reserve to allow a new cutting-edge to befiled farther back on the lip, and the instrument becomes useless. Another difficulty arising from this contiguity of the cutting-edge of the floor-lip and the spur is that when the former is cutting a chip the latter acts to cut round the edge of the next succeeding chip in exact conjunction of the former; hence each interferes with the action of the other, the fibers of the wood are torn as the bit enters, and the hol is not bored smoothly.

My improved double-twist anger is designed to overcome these objections; and my improvement consists in constructing the cutting-bit in such a manner that the floor-lip and the spur, instead of acting in conjunction, act separately and independently of each other.

The instrument, as represented in the drawin gs, is constructed with a double-twisted pod, A, and the two floor-lips B B. The latter project beyond the positions inwhich they have heretofore been placed, and the spur a, instead of being situated at the outer front cor ner of the cutting-edge of the floor-lip, where the latter, from itsnecessary thinness, is weakest, is projected from its hinder part or heel, where it is thickest and strongest. By this change in the relative position of the cuttingedge of the floor-lip and the spur I effect a new relationship between them, so that the one in acting does not interfere with the operation of the other, and an instrument is obtained which is strong and durable, while at the same time it requires less power to operate it than the common auger, produces a smoother hole, and will bore faster without danger of breakage. These advantages insure, first, because the spur, being situated some distance behind the cutting-edge of the floorlip, does not necessarily act to cut through out its entire length, and hence its root can be made larger than is possible in the ordinary method of constructing double-twist angers, where its increase in size at the out-er corner of the floor-lip would impede the action of the instrument; secondly, as the spur is projected from the strongest part of the lip it is not liable to break with the strain and carry with it a portion of the floor-lip thirdly,

the instrument is much more durable be cause, as the floor-lip is filed away a snificient quantity of material is in reserve to form a new cutting-edge, and as the spur can be made heavier and stronger it also is of sufiicient size to admit of a considerable amount of filing before its strength is materially impaired.

The efi iciency of this instrument and the smoothness of the hole bored are the necessary results of this improved construction, first, because the wood upon which the spur, is acting is not disturbed by the'floor-lip, and remains firm both before and behind the spur,

which thus acts smoothly round the edge of the chip to be removed by the succeeding floor-lip secondly, because the chips removed by the floor-lip, being undisturbed by the action of the spur, pass freely out of the hole as fast as they are cut, thus preventing the choking of the pod.

' The double-twist auger thus constructed becomes an efficient instrument for boring hard woods eitheracross or endwise with the grain, for which purpose the ordinary doubletwist angers are almost useless.

It may be constructed with or without the side lip projecting upward from the periphery of the floor lip but I prefer to constructit as represented in the accompanying drawings, without this addition, which is useless when the spur performs its work efficiently, as it must in my anger.

Having thus described my invention, what I claim therein as new, and desire to secure by Letters Patent, is

The projecting of the floor-lips in advance of the cutting-spur substantially as herein described and for the purpose herein set forth.

RUSSELL JENNINGS. Witnesses EDWARD H. KNIGHT, ALEX. A. O. KLAUOKE.

Images