US139417A - Improvement in reversible rotary cutters - Google Patents

Description

Patented May 27, `1873;`

l r r y E. v.,nNE|LL.

Reversible Rotary Cutters;

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Mmmm am UNITED STATES PATENT OFFICE.

EDWARD ONEILL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 HIMSELF, JAMES KELLY, AND ROBERT PILKINGTON, OF SAME PLACE.

IMPROVEMENT IN REVERSIBLE ROTARY CUTTERS.

S pecilication forming part of Letters PatentNo. 139,4l7, dated May 27, 1873; application iiled February 27, 1873.

To all whom it may concern:

Be it known that I, EDWARD V. ONEILL, of Philadelphia, Pennsylvania, have invented an Improvement in Reversible Rotary Cutters, of which the following is a speciiication:

My invention relates to that class of rotary cutting-tools which are provided with two sets of radiating blades; one set to cut when the tool is rotated in one direction, and the other when it is lrotated in the opposite direction and the object of my invention is to prevent the grinding away and dulling of the cuttingedges of the reversed set of cutters by contact with the marble or other material, or the chipping of the latter by the same, while the cutters of the other set are in operation.

I accomplish this object in the manne-r plainly shown in the plan view, Figure l of the accompanying drawing, by rendering the blades A and A of the two sets adjustable toward and from the center of the tool, so that the reversed set may be drawn in, and the operatin g set projected outward, the simultaneous adjustment ofthe Whole number of blades of both sets being eii'ected by a partial rotation in one direction or the other, of a hub, B, provided with alternate recesses and projections a and b adapted to the inner ends of the blades. The blades are'in the presentinstance arranged in pairs, back to back, as plainly shown in Fig. l, with their cutting edges beveled in opposite directions, the blades A being arranged to cut when the tool is rotated in the direction of the arrow, and the bladeslA when it is reversed or rotated in the opposite direction. Each pair of blades is adapted to and arranged to slide in a single radial recess, d, formed in the stock F of the tool, the said blades being retained in these recesses by the anges e and e of the two plates G and H, which overlap the projections f and f at the opposite ends ofthe blades, as plainly shown in the sectional view, Fig. 2. The rotating hub B is conical in the present instance, and is adapted to a correspondinglyshaped recess inthe stock F, in which it can be turned to la limited extent by means of a thumb-screw, h, extending through a slot, i,

in the plate Gr, the said thumbscrew also serving as a means of seeming the hub after adjustment. When the parts are in the position shown in Fig. 1 the extended blades A, which have a solid end bearing against the projections b of the hub, operate upon the marble stone or other material to be cut, when the tool is rotated in the direction of the ar row, while the inner ends of the reversed blades A are received within the recesses a of the hub, and are thus retracted suiiciently to prevent their y cutting. edges from being brought in contact with the marble, the dulling of the said blades, or the chipping of the marble by the same beingJ thus prevented. When the cutter is to be operated in a reverse direction, the hub B is turned to the limited extent necessary to force the blades A outwardly, and to bring the recesses a of the said hub opposite the inner ends of the blades A so that the latter maybe retracted sufficiently to protect their cutting-edges.

I prefer to arrange the blades in pairs, as`

shown in the drawing; but eachblade may, if desired, be adapted to a separate recess in the stock F. In such case, however, unless the blades were very close together there would have to be a separate recess and projection a and b, in the adjustable hub for each blade.

I claim as my invention:

1. A reversible rotary cutter in which two sets of blades are larranged radially, and are combined with operating devices as described, so that one set of blades is retracted when the other is extended, as set forth.

2. In a rotary cutter, the combination, substantially as described, of two sets of adjustable blades, A and A', with an adjustable hub, B, formed with recesses and projections a andr b adapted to the inner ends of the said blades.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

EDWARD V. ONEILL. Witnesses:

EDWARD R. WOREELL, DANIEL W. GILBERT.

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