UNITED STATES PATENT GranenL HARBERT K. FORBIS, OF DANVILLE, KENTUCKY, ASSIGNOR TO HIMSELF AND JOHN XV. PROCTOR, OF SAME PLAGE.
IMPROVEMENT IN MORTISING-TOOLS.
Specification forming part of Letters Patent No. 146,058, dated December 30, 1873; application filed November 15, 1873.
To all whom it may concern:
Beit known that I, HARBERT K. FonBIs, ot Danville, in the county of Boyle and State of Kentucky, have invented a new and Improved Mortising-Tool, of which the following' is a specification:
The object ot' my invention is to provide an efficient tool for making mortises by boring into the Wood, and at the same time cutting it out laterally by moving forward and backward along the wood the length of the mortise and it consists of a cylindrical piece ot steel having cutting-edges along the sides formed by, say, two grooves extending from the cutting end along cach side to the shank and vanishing in the surface thereat, and also having cutting-bits formed on the end by a deep notch made between said bits, which project on each side of the notch, `the latter to bore into the wood while the former work out the mortise laterally.
Figure l is a side elevation of a mortisin gtool constructed according to my invention. Fig. 2 is an elevation of the cutting-end, and Fig. 3 is a sectional elevation of the tool taken Afon the line .c m of Fig. 1. Fig. 4 is a crosssection on the line w x of Fig. 3.
Similar letters of reference indicate corresponding parts. 1
A represents a cylindrical piece of steel as large in diameter as the Width of the mortise to be made, having a tapered shank, B, to tit` in the chuck or stock for holding it also, l1aving, say, two grooves on opposite sides eX l ing along the wood to work out the mortise.
This oval or eccentric shape extends from the round shank B to the boring-point, gradually increasing thereto. The grooves produce air-` currents for carrying o' the chips, besides ai'ording the space therefor.
Having thus described my invention, I claim as nenr and desire to secure by Letters Pat` ent- As an article of manufacture, the tool A,
having opposite rabbets, notch F, borngrbitsw G G', and side cutters E H, the whole constructed substantially as and for the purpose described.
HARBERT K. FORBIS. fitnesses J. M. WALLACE, N. SANDIFER.