US847137A - Method of making drawing-knives. - Google Patents

Description

170,847,137. PATENTED MAR, 12, 1907.

W. s. WARD. 4 METHOD OF MAKING DRAWING KNIVES.

APPLICATION FILED MAB..24,1906

UNITED STATES PATENT OFFTGE.

WILLIAM S. WARD, OF PLANTSVILLE, CONNECTICUT, ASSIGNOR TO H. D.

SMITH AND COMPANY, OF PLANTSVILLE, CONNECTICUT, A CORPORA- TION.

Specification of Letters Patent.

Patented March 12, 1907'.

App cation filed March 24, 1906. Serial No. 307,834.

Io all whom it may concern:

Be it known that I, WILLIAM S. WARD, a citizen of the United States, residing at Plantsville, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Methods of Making Drawing-Knives, of which the following is a specification.

My invention has relation to drawingknives formed by drop-forging, and in such connection relates to the method of forming the blade, shanks, and portions of the handles at a single forging.

The objects of my improvement are economy, uniformity, and neatness in production, and particularly the economical production of the article with a particular style of handle.

In the accompanying drawing, Figure 1 is a view of the broad side of a blank which is the result of the first step in my method of making drawing-knives. Fig. 2 is an edge view of the samethe lower edge-as shown in Fig. 1. Fig. 3 is a transverse section of the same on the line 00 as of Fig. 1. Fig. 4 is a broad-side view of the same when partially trimmed, and Fig. 5 is a broad-side view of the completed forging.

The drawing-knife blade A and the shanks 6 6, extending longitudinally from the said blade, are or may be of the ordinary form. The shank and handle connections 7 7 are of a rounded form in cross-section and in side view are on a curve, so as to project substantially at a right angle to the length of the blade. Each handle connection merges into a tapering handle-tip 8, from which tip there extends a flattened handleweb 10,with a handle-butt 11 at its extreme outer end, all as shown in Fig. 5. The handles are to be finished by the application of a suitable handle-scale to each broad side of the handle-web, all substantially as disclosed in my Patent No. 737,179.

' In order to produce this drawing-knife, as shown in Fig. 5, I form dies with recesses for the respective parts hereinbefore described; but instead of locating the said parts, as shown in Fig. 5, they are located with the recesses for the handle portions lying closely to and substantially parallel with the bladerecess and with the connecting shank-recess curved at each end, whereby a rectangular or round bar of steel B when properly heated and subjected to the dies will produce the blank shown in Figs. 1, 2, and 3, with the usual web or fin of metal 9 projecting from the several parts and connecting them with the bar of metal B, from which they were formed. This web or fin is then removed by means of trimming-dies and the forging straightened out into the form shown in Fig. 5. It is best to do the trimming at two diii'erent operations, in which case the outer edges will be trimmed off first, changing the blank, Figs. 1, 2, and. 3, into the form shown in Fig. 4-. The remaining or inner web may then be removed by the second trimming operation. The forging thus produced is substantially doubled upon itself at each end, and after trimming and while still hot it is straightened at the shank portions to bring the handle portions into the proper position, as shown in Fig. 5. In this connection it' 'should be noted that the proper curve for the handle connections 7 is best given them in the die-recesses, so that this curve is not changed in the straightening-out process, all of the change being produced by bending and straightening out the shanks 6. This is easily accomplished by the aid of a former shaped to conform to the back edge of the shanks, (shown in Fig. 4,) against which former the back edge of the shanks will gradually come in contact as the forging is straightened out. By my method this particular style of handle is cheaply and neatly forged. in one piece with the blade and shanks.

I claim as my invention The herein-described method of producing drawing-knives which consists in striking up a blank from a bar of metal by dr0p-forging in dies, with the blade, shanks and handle portions substantially doubled upon each other at each shank, then trimming off the fin or web, and finally straightening the shank portions to bring the handle portions into their proper position relatively to the blade.

WILLIAM S. WARD. Witnesses:

JAMns SHEPARD. SHEFFIELD H. CLARKE.

Images