US398910A - Die for making chisels - Google Patents

Description

(No Model) J. SWAN.

DIE FOR MAKING GHISELS.

No. 398,910. Patented Mar. 5, 1889.

UNITED STATES PATENT Urricn,

JAMES SVAN, OF SEYMOUR, CONNECTIL'TUT.

DIE FOR MAKING CHISELS.

SPECIFICATION forming part of Letters Patent No. 398,910, dated March 5, 1889.

Application filed January 8, 1889. $erial No. 295,794, (No model.)

To all whomit may concern.-

Be it known that I, JAMES SWAN, a citizen of the United States, residing at Seymour, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Dies for Making Beveled-Edge Chisels; and I do hereby declare the following to be a full, clear, and exact description of the inventiornsuch as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to produce a set of dies that will perfectly form firmer chisels and other tools having beveled edges.

Heretofore, so far as I am aware, the bevcls upon tools of this class have been made on tirely by grinding upon stones, which is a very expensive operation, wasting as it does considerable steel in each tool, wearing away the stones very rapidly, and requiring a large amount of time and skilled labor. Attempts have heretofore been made to form this class of tools byswaging-in dies. These attempts, however, have never been successful, for the reason that, so far as I am aware, but one die has been used, and that not of proper shape. I have discovered, after a carefally-conducted series of experiments, that perfect tools of this class can be formed by the use of one or more short breakingdown dies and one or more longer drawing and finishing dies. In practice I accomplish perfectly satisfactory results by using a single short breaking-down die flaring at the ends and a single longer drawing and finishing die, in addition to which I of course use the ordinary gage-die, all the dies in the series being formed in two blocks of metal.

It will of course be understood that the upper die is carried by a power-hammer and that the lower die is supported in any suit able manner. These features, having nothing whatever to do with my present invention,

down dies; Fig. 3, a section on the line y y in Fig. 1-that is, through the drawing and finishing dies; Fig. 4, a plan view of the lower dies; and Fig. 5, a view of an ordinary firmerchisel, showing the blade as formed by my novel dies.

1 denotes the lower block of metal in which the lower breaking-down die, 2, and the lower finishing die or dies, 3, are formed, and l denotes the upper block, which constitutes the upper'ineniber of each pair of dies.

It will of course be understood that the special shape of the dies is made to correspond with the chisel that it is desired to produce. As this class of chisels is usually made thickest at the handle end, and the bevels of about the same width from end to end, it of course follows that the front end of each lower die inust be more or less lower than the rear end,

depending. of course; upon the style of chisel it is desired to produce. The breaking-down dieor, more correctly, the lower member of the pair of breaking-down dies, which I have denoted by 2I form in practice from an inch and a quarter to an inch and a half long, making the die to flare considerably at both front and back, the curves reaching nearly to the center of the die. The portion of the upper block which acts in connection with this die, which is, strictly speaking, the upper brealc ing-down die, and which I will designaie by 5, I preferably curve slightly from front to back, as is clearly shown in Figs. 1 and 2. The drawing and finishin dies are made practically the same size and shape in cross section the breaking-down dies. If any difference at all is permitted, the drawing and finishing dies should be slightly smaller, so that the chisels will be turned up perfectly. These dies l lllflliO approximately double ihc length. of the breaking-down dies, bevcling thcin slightly at the ends. it should be understood, however, that my invention not liiniicd to any special length of either The breaking-down or the drawing and finishing dies, this being a matter that may be left with safety to the judgment of the manufacturer after the principle of my invention has been explained, the gist of my invention lying in the discovery that by the use of relatively short breaking-down dies, followed by the use of relatively long drawing and finishing dies,

it is made practicable to form tools of this class in dies, thereby producing very much better tools at a greatly-reduced cost, as the operation of grinding down the bevels is wholly dispensed with. It is of course not essential that the entire grooves of the dies should be in either block. Both blocks may be grooved, if preferred, one of the grooves being of slight depth.

6 denotes the gage-dies, which are formed in the upper and lower blocks, as clearly shown in Fig. 1.. After each operation the chisel is passed through the gage-dies, so as to keep the edges straight and to keep the chisel the exact width required.

Having thus described my invention, 1 claim- Y 1. A set of dies for making beveled-edge tools, consisting of a relatively short break in gdoWn die of the required shape Whose ends member being fiat upon its under side.

In testimony whereof I affix my signature in presence of two Witnesses.

JAMES SWAN. \Vitnesses:

A. M. WoosrER, 07 M. NEWMAN.

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