US133573A - Improvement in hollow augers - Google Patents

Description

M. L. EDWARDS.

Hollow Augers. A

r Patented De'c.3,1872.

1tive position to the center as the others.

PATENT CFFIGE.

MARTIN L. EDWARDS, OF SALEM, OHIO.

IMPROVEMENT IN HOLLOW AUGERS.

Specification forming part of Letters Patent No. 133,573, dated December 3, 1,872.

To all whom 'it may concern:

Be it known that I, MARTIN L. EDwARDs, of Salem, in the county of Columbiana and State 'of Ohio, have invented new and useful Improvements in'Hollow Angers for Cutting Tenons, of which the following is a specification:

My invention has for its object the cuttin of tenons of different diameters on wood by a tool, the knives of which are adjustable concentrically to cut a larger or smaller tenon; and my said invention consists in the construction, arrangement, and combination of the several parts of the said tool, as hereinafter more fully described.

In the accompanying drawing, Figure l represents a front elevation or face view of my improved hollow auger for cutting tenons, Fig. 2 represents a longitudinal section of the same, the line of section passing through the cutters in the headflange; Fig. 3 represents a view of the rear side of the head-flange, the plate for adjusting the knives and guides being removed; Fig. 4 represents an inside face view of the plate which adjusts the knives and guides; and Fig. 5, a side and end view of one of the cutters.

The hollow auger for cutting tenons consists of a hollow shank, a, provided with an internal screw-thread, and at one end with a head consisting of a liange, l), which flange is provided with 'four equidistant slots, c, extending from the central opening of the shank a to the periphery of the iiange b. These slots are not exactly radial-that is to say, each two opposite slots are not in the same diametrical linetheir inner ends not being exactly opposite each other; but each slot has the same rela- In these slots c the longitudinal tongues d, formed on the inner side of sliding blocks e, have a free movement toward and from the center, being prevented from moving out of the slots c by means of short platesf extending from the outer end of the tongues d inwardly to about half their lengths, and which bear against the rear side of the head-flange b. On the outside ofthe pl ates f tongues g are formed, which have concentric grooves or ways h cut across them to receive corresponding concentric ribs i formed on the inner surface of an adjustingplate, j. This plate j is provided with a cenvfirmly in place.

tral opening to admit of its being passed over the shank a, on which it may be moved at pleasure. The ribs t' on its inner surface are eccentrically curved or inclined, and each one bears the same relative position to its corresponding groove It on the tongue g, and to the center of the hollow shank a, so that if the plate j is turned one way or the other its ribs fi, operating the blocks c through the grooves hin their tongues g, will force the sliding blocks e either toward or from the center in their slots c to perfectly equal distances, and the inner ends of the blocks will therefore be always concentric and equidistant in whatever position they may have been placed by the plate j. This adj usting-plate j is held to the flange b, and in any desired position relatively to the distance of the sliding blocks@ from the center by means of set-screws k, which pass through curved concentric slots l, formed at opposite sides in the plate j, and which set-screws pass into screwholes formed in the ange b, shoulders m formed on them near their outer ends bearing against the outer face of the plate j and holding it sliding blocks c are cut out to conform to the periphery of the central opening of the shank a, and two of them on opposite sides have slots n cut in the surface of their outer ends, in which slots the square4 shanks o of the cutting knives p fit snugly, screws r passing through said shanks into the sliding blocks, rigidly securing the knives in their respective blocks e. A portion of the sliding blocks e under the knives p is cut away to leave a space for the free passage of chips, which thereby will be. prevented from clogging the knives. Into the hollow shank a, from its near end, screws the screw-head s of the mandrel t, which mandrel is provided with a square end, a, by means of which it may be attached to a lathe or other machine for revolving the tool. this mandrel the length of the tenon is determined; for when it is'secured into the shank a to such a distance that the distance from the surface of its screw-head s to the edge of the knives p is equal to the desired length of the tenen to be cnt, the mandrel is kept in such position by means of a shouldered sleeve, fv, which has a free movement on the smooth, round shank of the mandrel, and which is then moved on said shank until its shoulder firmly The inner ends of the four By means of bears against the end of the hollow shank a, and secured by e set-screw, w. When the end of the tenon which is being out reaches the surfe-ce of the said screw-head s of the mendrel the tool can out no further, and thus the length of the tenon can be determined and regulated by the mandrel t.

My improved tenen-cutter can be made of` size of tenon by means of the plate j, which is released or held in position merely by the setsorews k, thus rendering the tool simple, and easily handled and adjusted.

Having described my invention, I claim- The hollow auger for cutting tenons, all its parts being arranged and constructed as described.

MARTIN L. EDWARDS. Witnesses:

B. S. AMBLER, PETER AMBLER.

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