US499998A - Die for making axes - Google Patents

Description

231i 1; --S11 t 1. 0. W. HUBB D 66 5 e6 DIE FOE MAKIN XES. No. 499,998. Patented June 20, 1893.

UNITED STATES PATENT. OFFICE.

CHARLES W. HUBBARD, OF PITTSBURG, PENNSYLVANIA.

DlE FOR MAKING AXES.

SPECIFICATION forming part of Letters Patent No. 499,998, dated June 20, 1893..

Application filed September 8, 1892. Serial No. 445,305. (No model.)

To all whom it may concern.-

Be it known that 1, CHARLES W. HUBBARD, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in the Manufacture of Axes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, in which Figure 1 is a front elevation of an ax-diepress, showing the dies in section. Fig. 2 shows the lower die in plan view, with the axpoll lying thereon. Fig. 3 is a view on larger scale, showing the dies in section, and closed on the ax-poll. Fig. lis a similar view, showing the dies open.

My invention relates to the manufacture of axes and similar tools, and is designed to'produce a better finished article with dies than has been possible heretofore.

To this end it consists in mechanism of improved form comprising dies having a working face with a convex portion extending across the die, also in such dies in combination with an end plunger adapted to be held with yielding pressure against the metal under treatment, as hereinafter pointed out in the claims.

In the drawings, 2, 2, represent the frame or housings of a die-press, having a moving cross head which carries the upper die 3.

5 is the lower die, set on the bed of the machine, and adapted, when in vconj unction with the moving die, to afford a cavity of the size and shape of the finished ax. At their ends the dies are recessed to form ahole into which fits a plunger 7, attached to a sliding-barS, which passes through the frame 2, and is adapted to be forced inwardly by yielding pressure of a weight 9,which maybe replaced by a spring or other-equivalent device. The dies have the usual side recesses to receive a mandrel 12 around which the eye of the ax-poll. is formed. Instead of the usual concave contour given to the faces of the dies, my improved dies have convex portions extending across the middle of their faces, as shown at a, a, so that when they act upon the ax, they shall tend to cause the metal to flow endwise in both directions throughout the width of the ax. This insures the formation of a perfect ax, and avoids the imperfections caused by the tendency which the concave die faces have to draw the metal toward the middle of the axpoll. As the metal is endwise forced by my improved dies its flow is resisted by the inward yielding pressure of the plunger, which thus compresses the metal, causes the ax-poll to be perfectly shaped, and by adjusting itself to conform to the amount of stock in the ax-poll, efiects the results above mentioned, even though a little too much or too little stock be present in the blank.

Another material advantage of my invention is that the blade and poll of the ax may be welded together by the action of the dies. I-Ieretofore the line of joinder between these parts has, with concave dies,been necessarily the last part acted on by the dies and, consequently, the flux gathering at this point has prevented the welding of the parts, which therefore have to be welded by the hammer, a separate operation. By the use, however, of convex dies, having the convexity extending across the ax at the place of welding, as employed in my improved method, the line of joinder between the poll and blade of the ax is the first instead of the last part acted on, and a complete weld may be formed, the surplus flux being driven away from this point instead of toward it. I therefore, when it is so desired, am able to insert the blade of the ax in the cavity of the poll and weld the parts together by the same action of the dies that forms the poll of the ax.

The operation is as followsz-The ax-poll with the mandrel therein is laid between the dies, and is compressed laterally thereby, the plunger simultaneously pressing against the metal therein and acting as above described, causing the shaping of the poll Without the formation of fins.

The claims of this specification relating to the construction of the dies with convexities on their faces are not necessarily limited to use in conjunction with the yielding plunger, except when such limitation is expressed in terms.

I do not claim herein broadlya pair of dies having a hole, a plunger movable within the hole, and means for continuously forcing in said plunger with a yielding pressure, as this is not my invention, but

What I claim is 1. Ax dies having faces with convex portions extending across the die cavities at the pointof juncture of the polland bit; substantially as described. I 2. Astationary die and a reciprocatory die 5 each having convex portions extending across the die-cavity, a plunger within ahole extending into the die-cavity, and means for exerting a constant yielding pressure thereon; substantially as described.

3. Ax-dies having faces withconvex portions to cause outward flow of the metal, in combination with an end die, and means for applying a constant yielding pressure to the latter; substantially as and for the purposes x 5 described.

4.. Ax-dies having faces adapted to cause the endwise flow of themetal from the middle outwardly, in combination with an end-die, and means for causing the compresssion of the blank by the dies first named, and for ap- 2o plying a constantyielding pressure to the end-die; substantially as described.

In testimony whereof I have hereunto set my hand this 29th day of August, A. D. 1892.

. CHARLES W. HUBBARD.

Witnesses: I R. H. WHITTLESEY, H. M. CoRv'vIN.

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