US 440682 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
W. M. WOOD;
No. 440,682. Patented Nov. 18, 1890.
ATTEST'" l/vvE/v'roaf Q 4 aw. 7'M I UNITED STATES PATENT OFFICE.
WILLIAM MAXWELL WOOD, OF BOSTON, MASSAOHUSETT S, ASSIGNOR TO THE THOMSON ELECTRIC WELDING COMPANY, OF MAINE.
SPECIFICATION forming part of Letters Patent No. 440,682, dated November 18, 1890.
Application filed April 19, 1890. Serial No. 348,676. (No model.)
To aZZ whom it may concern.-
Be it known that I, WILLIAM MAXWELL WOOD, a citizen of the United States, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented a certain new and useful Burr-Remover, of which the following is a specification.
My invention relates to the construction of emery-wheels or wheels made of other similar abrasive or polishing material and designed for use in removing protuberances or projections from metal or other objects, so as to produce a uniformly smooth or plane surface.
My invention is especially designed for wheels used in removing the burr formed at the weld made by the well-known electric- Welding process.
My invention consists, essentially, in providing the wheel with two guards of nonabrasive material consisting of disks or plates applied to opposite sides of the wheel and coming out flush at their edges with the grinding-surface of such wheel. These guards being thus constructed are adapted to engage with the material in its plain or fiat portions at the sides of the projections to be reduced, and to thereby prevent the reduction or lowering of the general plane by the grinding or cutting, while at the same time permitting the wheel itself to operate freely and abrade or grind the parts arising above such plane.
I have herein illustrated my invention as embodied in a tool particularly adapted to removing the burr from pieces of metal joined by the electric-welding process,'wherein end pressure is employechso as to cause the metal to upset at the joint.
In the accompanying drawings, Figure 1 is a side elevation of a wheel embodying my invention. Fig. 2 illustrates a modification wherein two wheels of different degrees of fineness are combined in one structure. Figs. 3 and 4 illustrate the two positions of the tool shown in Fig. 2.
Referring to Fig. 1, A indicates the body of the wheel, which is made of emery or similar abrasive or grinding substance, and is mounted upon a suitable shaft, which passes through a suitable housing or tubing 0, by which the wheel may be held in the hand, motion being communicated to such shaft through a flexible connection or shaft. The portion of the wheel A may be wholly of emery, or may simply be faced with the emery to a suitable depth.
B 13 indicate the metal guards, which are designed to prevent the part A of the wheel from cutting or grinding below the general plane of the object operated upon. These guards B B are of some non-abrasive material, and are selected, preferably, with reference to the wear of the wheel A in practical operation. In practice I find that for removing the burrs or projections from iron a metal like cast brass will do very well for the guards B B, as it will wear at about the same rate as the emery. Of course the material for the guards would vary in any case with the natural rate of wear of the grinding-wheel A When used in any particular kind of work.
In case the soft-metal guards and the wheel A wear at all unevenly a file, steel-point, or edge maybe used for truing up. As the edge is of soft metal, it may be readily and quickly trued by holding a file against it while it is rapidly revolved.
In Fig. 2 I have shown a wheel as made of two parts A A each of an abrasive or grinding substance, but of different degrees of fineness. The guards B B B are applied, as shown, and the two parts of the compound wheel are beveled away from the center, as indicated, so as to permit it to be used in the manner indicated in Figs. 3 and 4, the coarse wheel being used for taking off the greater partof the burr or projection and the burr being afterward finished with the finer wheel, as indicated in Fig. 3. The guards may be secured to the wheel in any desired way, as by bolts passing through or by clamping the wheels and the guards together on the shaft.
What I claim as my invention is 1. The combination, with a grinding-wheel of emery or other abrasive material, of two guard-plates or disks arranged at opposite sides of the said wheel and having their edges flush with the grinding-surface of the wheel, as and for the purpose described.
2. The combination, with an emery-wheel, of two metal guards composed of material adapted to wear at about the same rate as the grinding portion of the wheel and consisting applied to opposite sides of the wheel flush 1 with the edge thereof; and an intermediate guard-plate between the two parts of the wheel and flush with the greater circumference of the same, as and for the purpose described.
Signed at Boston, in the county of Suffolk and State of Massachusetts, this 16th day of April, A. D. 1890.
WVILLIAM MAXWELL WOOD.
H. PERCY MAXIM, HENRY N. SWEET.