US75990A - Improvement in sickle-sections, and in method of seriating- them - Google Patents

Description

@einen Agratas Alatrnt @ffice SAMUEL'D. SHELDON, CFlil'lCl-IBURG, MASSACHUSETTS, ASSIGNOR TC THE WlpllTi-IIAN AND MILESl MANUFACTURING COMPANY.7

Letters Patent lVo. 75,990, aatcddll'arct 24, 1868.

IMPROVEMENT IN SICKLE-SEGTIONS, AND IN METHOD OF SERRATING THEM.

KNOW ALL MEN BY THESE PRESENTS:

That I, SAMUEL D. SHELDON, of Fitchburg, in the county of Worcester, and Commonwealth of Massachusetts, have invented certain new and useful Improvements in the Mode of Cutting or Serrating Sickle-Sections; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, in which Figure 1 represents a perspective view of a blank section placed in position upon the anvil or block preparatory to being serrated or cut.

Figure 2 represents a section on line A B, fig. 1. y

Figure 3 represents a top or plan .view Yof a blank sickle-section after one bevelehas been cut or serrated.

Figure 4 represents a section' on line C D, fig. 3.

Figure 5 represents a bottom view of; a nished sickle-section made according to my invention, and

Figure 6 represents a section on line EF, Iig. 5.

To enable those skilled in the art to which my invention belongs to"make and use the same, I will proceed to descr-ibe it more in detail. I v

- In the drawing, the part lettered A is the anvil or block, on which tbe blank sickle-section B is placed to.

beV serrated or cut.- The anvil or block A is recessed or cut out to receive the blank-section, whereby the latter, after the clamp-lever C'has been forced down upon it, is retained ina secure position during the operation of cutting or serrating. A part of the face or edge D of the anvil A iszbevelled oft', as shown ata, figs. 1 and 2. The bevel part a extends back as far, or nearly so, as the bevel c on blank B, so' that, when the cutting-tool is forced down upon the bevel part c of the blank-Section, said b'evelpart cisr bent or forced down until it rests upon the bevel-edge aof theblock, so that, after the serrations orcuts 1` have all'been made upon the bevelled part c of the section, it has substantially the form and appearance shown in fig. 4. After both of the bevels a have been serrated or cnt ,asshownat 1, iig; 3, the section is tempered and then ground off` on the bottom, so as to have the form shown in figs. 5 and G. When the seri-ations or cuts are made upon the bevel part a, supa ported above the bevel c on the anvil, whereby the serrated part ofthe section is lient or forceddown, as shown in iig. 4, it requiresbut little grindingof the bottom of the section to vproduce a very perfect cutting-edge, e, and in practice it is found that no part of the bottom of' the section, except the bent partf, requires grinding more than what is necessary to give it a smooth finish, and even that is not actually necessaryin order to obtain a. good cutting-edge, since the bent partf being depressed below the bottom part E, bythe operation of cutting, a good cutting-edge is produced by simply grinding off the lowest edge of the bevelpartf.

By making the sections in the manner above described, much time and expense are saved in the process of grinding and finishing the bottoms and edges of the sections, while a larger per cent. is saved in the breaking and checking of sections during the operation of tempering, when the serrations are made in the manner above described, instead of by the old mode, in which the anvil vor block has no bevelface a, but supports the bevel part c firmly and in a horizontal position.

When the bottom of the section is supported upon an nnbcvelled anvil or block, the cutting-tool is very liable to be so held or struck asvto make deep,.Jwide, and irregular cuts through the edge of the bevelled part, which occasions checks and Cracks in the operation of tempering. Then, again, when the sections are not dam# aged by checking or breaking in the operation of tempering, so as to be noticed before they are put to practical use, the imperfect serrations are liable te and do often break out in a very few hours or days use, and thus greatly impair the efficiency of the cutting-apparatusof' the mower or rcaper.

It will be observed that I obtain a cuttingedge back ofthe edge of the bevel on the blank which is ground oti, a resultwhich could not be obtained by the old mode of making scrrations, and still have the body of the section of its full thickness, and the back ofthe section ground withouta bevel orrounded edge, which is neces.

sary in order to produce a good cutting-apparatus.

The sei-rations may be out by hand, or by my power-machine, for which I am about to apply for separate Letters Patent.

9' g are the holes through which rivets are passed to fasten the sections to the sickle or cutter-bar of the reaper or mower.

The anvil or block A is made of steel, and Well hardened or tempered.

Having described my improved mode of serruting sickle-seetions, what'I claim therein ns new, und of my invention, und desire to secure by Letters Patent, s

1. 'lhe hovellerlfuced anvil or block, forsupporting the blank-sections while the serrutons or cuts ure being made, substantially as und for the purposes set forth.

2. The mode of forming the serrated cutting-edge e of the section, as and for the purposes set forth.

3. The serrated-edged sickle-section, as un improved article of manufacture, made as shown and described,

and for the purposes set forth.

SAMUEL D. SHELD'ON.

Witnesses:

THos. H. DODGE, D. L. MILLEl.

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