US1003409A - Method of making knives. - Google Patents

Description

A. M. ALEXANDER.

METHOD OF MAKING KNIVES.

APPLICATION FILED JAN. 7, 1910.

1,003,409. Patented Sept. 19,1911.

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ALEXANDER :nz erszramnns, or BEVERLY;MASSACHUSETTS, ASSIGNOR TO UNITED soon rsscnrnnnr Q'QMPANY, or rerun-son, JERSEY, A CORPORATION or NEW JERSEY.

Speoiflca tion of Letters Patent.

METHDD Uh MAKING KNIVES.

fti atcnt ed Sept. 19, 1911..

Ilqmlieatien filed January F, 1310. Serial No. 536,835.

To cZZ whom may concern.

Be it known that l, ALEXANDER M. ALEX- lanolin, a citizen of the United States-1 siding, at Beverly., in the county of Essex and State of ill ussachusetts, have invented. certain isuprovements lllethods ot' Making; Knives, of which the following description. in nncc.'ion with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the figures.

This invention relates to a method of making cylindrical knives. 'lhesc knives which have the cutting edge formed upon one end of a cylinder are used in various arts. the illustrated knife, which the method herein described is especially intended to produce, being employed in a machine for skiving the parts of boot and shoe uppers such as shown in my co-pcndintr application. Sci. No. 522,905, filed October 16,

Cylindrical knives have long been employed in skiving niachii'ies, but owing to the great cost of the knives these machines have not come into very extensive use. There are, however, some advantages in skiving with a cylindrical knife which make skiving machines employing such knives desirable in the n'lanutacture of boots and shoes, and in order therefore that these advantages may be generally availed of without the accompanyii'u excessive cost of the ski'viug knives an object oi? this invention is a method 0t making cylindrical knives, especially adopt-- ed for use in skiving' machines, by Which. these knives may be produced at a low cost.

To this end the method contemplates the novel procedure hereinafter set forth by which a knife having a true cylindrical form, which is ot a to tit accurately the holder for which it is made which is properly l'uu'dcncd and tempered may be easily and quickly produced.

Where accuracy of form and fit has been especially desirable, as in skiving machines cylit'idrical,knives have usually been made l'un'etoforc by forging a blank and then mil in; the blade out of the blank. Knives thus produced are obvii'iusly comparatively expensive. lly the method of this invention a band oi st el oi. the proper composition and length is first rolled into the desired cylindrical form is then confined in a holder constructed to maintain this'form and .While confined in tl'lis holdcr is hardened throughout that portion. which, upon successive grindings, will furnish. the successive cutting edges.

In Figure l of the accompanying drawings sl'iown a knife of the type intended to be produced by this method; in Fig. 2 is shown the holder in which the knife is confined for the hardening operation after it has'becn rolled into its shape, the holder in this figure. being shown with the parts in the relative positions into which they are put when the part of the knife to be hardened. is to be immersed in the heating hath; 3 is :1 section through the knii'c holder showing the parts in the relati *0 position into which they are put when the knife is to be immersed in the inn-cloning bath.

The knife shown in .lfiigi l is fi'n'med of a ribbon or band ofstccl of suitable coniposition, the band being preferably of uniform composition throughout. This band having been cut to the proper length is first rolled by any suitable rolling machine into the desired cylindrical form provision being made in measuring the original length for a slight contraction inv hardening and temperin The band of steel is preferably rolled into its cylindrical form While in its unteinpered condition. Having been rolled into cylindrical form, the knife is placed in he holder shown in Figs. 2 and. 3, this holder being adapted to engage the knife both on its outside and on its inside surfaces, as shown especially in Fig. 3. The holder comprises a rin 4 having an annular sockbt (i which. receives the knife 2 and in which the knife is confined by a second ring 8 milled to fit within the knife 2 when it is in the socket l and to rest upon the bottom of said socket. The ring 8 is of such Vertical dimension that its upper surface lies flush with the upper surface of the rin 4- Whcn it in the socket 6. A bail 10 having cars which receive trunnions 12 upon the ring 4 is used by the operator to support and lift the ring during the heating and hardening operations. The ring; 4 is also provided With an eye piece 14 so located that the operator may engage it with a hook and turn the ring over after the heating operation to cause the ring" to assume the position shown in Fig. 3 for the hurdcnin operation.

The method of procedure inthe heating and hardening operations is as follows:.

The parts being in the position shown in its exposed portion is heated to the desired, hardening temperature, the portions of the knife immediately adjacent to the exposed portion being heated by conduction through the rings 4E and 8. After the knife is heated to the desired hardening temperature, the holder is taken from the heating bath and the operator engages the eye 14 With a hook or other tool and turns the holder into the position shown in Fig.3. The holder and knife-are then immersed in the hardening bath which is preferably an oil bath. It Will be seen that the holder strikes the hardeningbath first and that thus the confined portion of the knife is first cooled and that the unconfined portion is cooled gradually, the part of.the exposed portion of the knife nearest the confined portion being first cooled and then the succeeding parts until the outer edge of the unconfined portion is reached. This procedure keeps the knife from assuming a cannon mouth form. After the knife has been heated and hardened in the" manner described it is removed from the holder and put into a tempering bath and the hardness drawn to the required degree.

Having described my invention, What I claim as new and desire to secure by Letters Patent of the United States is 1. That improvement in the art of making cylindrical knives which consists-in rolling into the desired cylindrical form a band of steel of the proper composition and length, confining a marginal portion of the blank thus formed in a holder constructed to main tain the cylindrical form of the blank, immersing the unconfined portion only of the blank in a heating bath, and then reversing the holder to bring the unconfined portion of the blank above the holder and immersing the holder and blank in a hardening bath.

2. That improvement in the art of making cylindrical knives which consists in rollin into the desired cylindrical form a band or steel of the proper composition and length, confining a marginal portion of the cylindrical blank thus formed in a holder constructed to maintain the cylindrical form, immersing the unconfined portion of the blank in a lead heating bath and then immersing the holder and blank in a hardening bath in such manner that the confined portion of the blank is first cooled and that the unconfined portions which are heated to higher temperatures are cooled successively toward the edge which is to form the cutting edge.

In testimony whereof I have signed. my name to this specification in the presence of two subscribin witnesses.

ALEXAfiDER M. ALEXANDER.

Witnesses:

LEONARD M. J OHNSON, H. DORSEY SPENCER.

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