US106073A - Improvement in the manufacture of blades of pocket-cutlery - Google Patents

Description

WILLIAIVI H. MILLER AND GEORGE W. MILLER OF MERIDEN PATENT OEEICE.

, CONNECTICUT.

vIMPEovEn/IENT 1N THE MANUEACTURE or BLADES 0E POCKELCUTLERY.

Specilication forming part of Letters Patent No. 106,073, dated August 2, 1870.

` Cutlery; and wedo hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompany-` ing drawings, making part of this specification, and to uthe letters of reference marked thereon, in which i Figure 1 is a plan View of one-half the die. Fig. 2 isa plan `view of the other portion. Fig. 3 is a side view, showing the break-down die. FigA is a `vertical transverse section of the dies, when `placed together, through line C `D ofFig. 3. Fig. 5 is avertical transverse section of the same through line E Fof Fig. 2. Fig. 6 is a vertical transverse section ofthe same through line Gr` Hfof Fig.`2. Fig. 7-N

is a side View of a blank afterbeing operated upon by the break-down die o, and M is a plan view of the'same piece after being operated upon by the finishing-die L. Fig. 8 is a view of a blade after it has been forged and the .burrlremovedp` `Our invention relates to the manufacture of bladesl for pocket-cutlery; and consists of two dies or pairs of dies, 'used in' connection with each other, one of the said dies or pairs of dies preparing the metal in the bar for its nal shape by pressing or gathering it together at certain places, for the purpose of bringing the stock in a common bar of metal to those points where it is mostneeded in the manufacture of the blade. The otllerdie or pair of dies gives the desired final `shape o r form to the blade, both operations being performed while the metal is properly heated, and pressure applied to the dies while the metal is placed therein.

The object of our invention is to enable the `manufacturer to form the blades of pocketcutlery `with as little manipulation ofthe metal as possible, and yet not be obliged to use bars of metal of such size as to incur too much rwaste in their manufacture, thus saving time,

- scribe the same and its application to use.

In the drawing, A and B' represent two blocks of metal,'which, for convenience, contain the two dies required for the conversion of a portion of a bar of steel into a blank knife-blade; and, although the dies arein two parts-that is, one-half of the die is in one block, A, and the other in the block B--I denoniinatethe halves one die, inasmuch as the halves are necessary to give the required form to the metal. One of these dies I denominate the break-down, as it isV designed to break down or depress the metal or crowd it together in certain places, making the bar thicker in some parts and smaller in others, and this break-down is represented upon the side O ofthe blocks A and B. The form of this die is shown more fully in'Fig.V 3, in'which x" is a recess, terminating at each end iny the elevated points s and s', the'point s being the highest, and from these two points the planes n' and m extend, inclining downward as they approach the ends Vof the block B. In the block Ais another recess, w, opposite the one in the block B, and terminating in the ridges s and s, and in said recess 06 is a protuberance, From these ridges s ands/f the planes a and 'm extend each way, and incline upward as they approach 'the ends' of the block A. The depressions x" and fc/"f, and the protuberance when the blocks A Aand B are placed together, form a recess, which somewhat resembles, and approximates in its form, the heel of the knife-blade or the cavity ain the die.

The line t in Fig. 3 represents the line of division between the blocks A and B. In practice, one of the blocks is set in aflrm and solid position, while the other is fixed in a position to move downward upon the other block, and if a bar of metal be heated and placed lengthwise in the die thus described the ridges or parts s ands", and also s and 8"', approach nearer to each other than at any other part of the dies or blocks, and the metal is pressed harder at those points and is forced back each way, a part being crowded back into the recess at zu" 00', while Vthe-space between the planes a and a and m and m being widest at the outer ends, the metal is forced outward toward the ends and assumes the form of the break-down die, and the metal is forced, in a bar of Vuniform size, by this process into those parts of the bar where it is required to have the largest quantity of stock, and without the longer process of hand-forging, as is now prac ticed. This operation of breaking down the metal brings it into the form shown iu Fig. 7, at N, wherein the metal at a is pressed into the proper form and in the right quantity to till the part a in the die A B, which forms the heel of the blade, this part requiring more metal than the same length of any other part of the blade. The part b of the blank N also contains about the right quantityot' metal to form the blade by pressure in the die A B.

The cavity dis made in the blocks A and B, and is so shallow as to press the bar of metal very thin when placed therein. The size oi' this cavity, when the parts A and B of the die are placed together, is shown more fully in Fig. 6, and when the bar of meta-l has been pressed in this part of the die it is then in better shape to be drawn out into the proper form for the blade by the break-down die, hereinbefore described.

The cavity a is fiat at its base, and is of the proper size and shape to form the entire heel of the blade, and is shown in erosssection iu Fig. 5.

The cavity b is made one half in one block, A, and the other half in the block B, the part b being that part of the die which forms the blade at its thickest or heaviest part along the back. The part along the dotted line c is made more shallow, while the part at c', from the part u to the end of the die, is made a little deeper, to allow room for the w aste stock when the pressure is applied to the metal in the die, and a shallow cavity is also made at c, extending from the point e to the outer end of the die. This cavity c also allows room for the waste stock of the blade when pressure is applied to the metal in the die.

The edges t of the cavity b may be beveled in such portions as are desirable to give the proper bevel to the back and point of the blade. That part of the die which is thus described and forms the blade is shown in crosssection in Fig. 4.

No shallow cavities are required around the part a of the die, as it is designed that as little waste stock should be left projecting from the heel of the blade in the blank as possible, while it is desirable that the blade should be left a little thicker in the blank than in the iinished blade, in order to have suiicient metal to operate upon successfully in the process of tempering the blade and in giving it its final finish.

The small cavity o is made merely to give sufficient metal at that point in the blank to hold the blank blade to the rod in punching oli' the waste stock or burr from the blade.

Fig. 8 represents a blade after the Waste stock or burr has been removed, which may be done by means of' a die and counter-die of the desired shape of the blade.

1t will be perceived that by this operation the whole process of forming the blade of a pocketknife is con fined or limited to threc simple operations or movements of a die, while the small amount of time required to form each and the facility with which any number of blades of any desired style or pattern may be produced without the least variation renders this process a very advantageous one over the old process of forging the blades by hand.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

The process herein described of forging the blades of pocket-cutlery--that is to say, by rst subjecting the metal to pressure in the break -down die O, and then iinishing the forging of the same by submitting it to pressure in the inishing-die L, substantially as herein set forth.

WM. H. MILLER. GEO. W. MILLER. Witnesses:

ORviLLE H. PLArr, JOHN Q. THAYER.

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