US367131A - Die for forming axes - Google Patents

Description

DIE FOR FORM 111111111 c.

Patented J 1111111111 N. PrrRs. vmwmha n w, warn mmmm a UNITED ST TES PATENT OFFICEQ JOHN W. 'BOWERS, OF FRANKLIN, ASSIGNOR TO THE DOUGLAS AXE MANU- FAOTUBING COMPANY, OF BOSTON, MASSACHUSETTS.

DIE FOR FORMINGIAXES, 80C.

s ecific-Arron forming part of Letters Patent No. 367,131, dated July 26, 1887. Application filed February 23, 1887. Serial No.228A61. (No model.)

10 and similar wedge-shaped tools, not only upon the sides,but particularly upon the head; and it consists in having the matrix-space in the lower or anvil die contained below a horizontal plane coincident with the striking-surface of that die at the bit end equal to the entire finished tool, and the working-face of the upper die when fixedinthe machine substantially in a plane parallel with said horizontal plane, while the head-forming face of the lower 2 die is in a plane at right angles to a plane which will bisect the matrix-space laterally. Heretofore dies used for this purpose have been constructed in such manner that a horizontal plane passing laterally through the ex- 2 treme end of the bit or cutting-edge of the tool as it laid in proper position in the lower or anvil die would divide the tool into equal parts, and the upper surface of the tool would have an inclination equal to the angle made 0 by the-plane of such upper surface with said horizontal plane, and the working-face of the upper die'niust consequently have the same inclination. This construction tends to throw the upper die in the direction of the bit end 3 5 of the tool every time that that die is forced upon the blank in the anvil-die, which will soon loosen the upper die from its fastenings or cause undue strain upon the machinery.

Myimproved construction of dies obviates 40 these diiiieulties, and at the same time gives a much better finish to the head of the tool by pressing it with greater force against the headforming wall of the matrix. I

The drawing forming a part of this specification represents a vertical section of the dies through the middle of the matrix from the head to the bit end, the particular matrix shown being such as will produce an ax; but it will be readily understood that a modification of the specific form of the working-faces of the dies will produce articles of different external contour, but all within the class of wedge-shaped tools.

As will be seen by reference to the drawing, I make the matrix in the lower or anvil die, A, sufficiently deep and in such form as to bring'the upper surface of the tool when placed therein substantially in a horizontal plane passing through the extreme bit end e of the matrix-space or tool; or, more strictly speaking, substantially in a horizontal plane coincident with the striking-surface fof the lower die beyond the bit-forming end of the matrix; and I also make the working-face g of the upper die, B, in a plane, as nearly as its curved surface will admit, which is subof the striking-surfacef of the lower die. The

' wall h of the lower die, A,which is to form the head of the tool, I form in a plane at right angles to a plane, 1', (shown in dotted line,)

which divides the matrix-space into equal parts laterally.

When the upper die is brought into contact with the blank resting in the lower die, the lower inclined face of the matrix therein will cause the blank to be forced toward the headforining wall h, and thus the head of the tool will be swaged into a smooth and perfect surface, and the edges and corners of the head will be squared up and brought into perfect shapeat the same time that the sides or checks of the tool are given their finished form; and it will also be readily seen that the working-face g of the upper die being substantially. in a horizontal plane when striking the upper side of the blank,which occupies substantially a similar plane,will not be subjected to any undue lateral strain, as in the case of dies of prior construction, where two inclined surfaces are brought violently together.

In the construction of thelower die the projecting portion, which constitutes the head forming wall h, should be made higher than the thickness of the head of any tool which-is to be formed therein, in order that when the upper die descends the head end of its workingface may pass below the upper surface of this projecting portion of the lower die and prevent the possibility of crowding the metal of the blank over upon it.

A slight variation of the plane of the working-face of the upper die from ahorizontal position will not materially affect the beneficial operation of the dies; but by as much as the angle of-inelination between the plane of the \vorkingfiiee of the upper die and a horizontal plane decreases,by so much will the benefits incident to my improved construction be derived.

I elaim The improvement in dies for forming axes and similar \vedgeshaped tools, hereinabove described, in which the working-face of the upper die is formed substantially in a plane which is horizontal when the die is in proper position in the machine where it is to operate, and the matrix-space equal to the entire finished tool is contained in the lower die below a horizontal plane coincident with the striking-surface of the die at the bit end, the headforming wall of the lower die being at right angles to a plane which will bisect the matriX-spacelaterally,substantially as shown and 25

Images