US1669420A - Sheep-shear blade - Google Patents

Description

May 15, 192s. A 1,669,420

M. W. MCARDLE SHEEP SHEAR BLADE Filed Jan. 51. 1927 APatented May 15, 1928.

MICHAEL w. argentina,

or CHICAGO, ILLINOIS.

" 'SHEEP-sirena BLADE.

`Application filed Januaryl, 1.927.7 Serial 1S1'o.-164,"?06.`

The purpose of thisi'nvention is` to pro-4 vide an improved construction `of a cutting blade for a sheep shear andtheilike. tools, r

adapted :tor rendering the blade :reversible 4for utilizingthe shear; edges ofthe teeth at both surfaces of the blade andl also-inthe preferred form for utilizing' shear teeth formed at both longitudinal edges of the blade. y

In the drawings: i

Figure l is a plan view of a cutter blade embodying this invention in one of its forms.

Figure 2 is a section at the line, 2-2, on Figure 1. f l

Figure 2y isa section at the same line, showing one vpiece formation.

Figure 3 is a plan view of a modilied and in some respects preferred form of the blade embodying the invention.

Figure 4: is an end edge elevation oi, the blade shown in Figure 3.

Figure 5 is a section atthe line, 5-5, on Figure 3.

Inv both the forms shown in the drawings A represents the vibrating cutter of a sheep shear and the like tool, provided with means for its engagement by the actuating lever o't the tool for vibrating "it, said means consisting in the apertures, a, for engagement of the cooperating projections on the vibra tory lever of well known construction (not shown). The characteristic of the invention `consists in the form of the cutting edges of the blade which is produced by recessing said edges over their entire operating length `between the opposite upper and lower sur* faces of the blade for forming acute angled cutting corners ofthe blade. 4The recesses in the edge vof the blade are indicated at 10 at the several edges shown inthe drawings. Preferably the recess is symmetrical with respect to the two opposite surfaces of the blade between which it is formed, as seen in the drawings, and preferabl alsosaid recess is angular as shown in the rawings.

The advantage and purpose of this feature of construction will be recognized as being the adaptation of the blade to be used either side up on the comb or co-operating shear member ot the toolv for performing'ts shearing function byv means of either `corner of theshearing edge, both edges being alike in respect to their capacity for shearing, and the cutting teeth being formed as to the slope of their converging edges for cosope'rating similarly and equally with the teeti of the combler fixed cutter ofthe tool; `so that the blade maybe ground in theusual manner alikefupon the two faces and being originallyA ground' for-sharpening `the ycutting corners upon both ftaces`,-the tool may be continued in use twiceas long without interrupting for f regrinding ras itit could not beused either sideup, as tlie'gconstructiondescribedrenders possible.l v

The blade as lthus far described may be formed as to the recessed edges by milling and grinding the edges with properly formed milling and grinding tools, from a single piece of metal plate of suitable thickness 'for receiving the grooves or recesses in its edges;sbut the preferable mode of construction best adaptedfor economical.y and l accurate production consists in Vmaking the blade of two plates or laminas perfectly matched at their meeting faces and as to outline, each plate being beveled at the side of the meeting face before the plates are secured together, the two bevels co-operating to form the recess when the Aplates are thus' matched and secured tace to face. The desirable method of securing the plates t0- gether is by electric welding, as may be understood from the drawings not showing riveting kor other visible means of secure- 2. vibrating cutter for sheep shear andy the like, consistlng of' a metal plate of uniform thickness'throughout, having .its cut-` ter teeth distributed symmetrically about a fore-andaft middle line, whereby it is adapted to be reversed longitudinally to bring either of said opposite surfaces into (so-operation with the other member of they shear, and having the ycutting edges of the teeth recessed throughoutV their operating length between said two opposite faces.

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3. A vibrating cutter blade for sheep shear and the like, Consistin plate of uniform thickness, w iereby its opposite surfaces are vin parallel `planes,.said blade having teeth projecting oppositely of a metal j CFI 2 l f' l 1,669,420

from its opposite longitudinal'edges and disk tributed symmetrically about a fore-and-aft middle line and also about a longitudinal middle line, whereby the blade is2 adapted to be reversed both end-for-end and surfacefor-surface, the teeth upon both longitudinal;

edges being recessed between the opposite surfaces over their entire operatinglength to form acute angled cutting corners at both seid surfaces.

4. A vibrating cutter blade for e' sheep shear and the like consisting of e metal; plete fof uniform thickness throughout` whereby the opposite faces ere in parallel planes, hasL ing teeth projecting froml a longitudinal edge recessed between said opposite parallel feces throughout the operating length oi the shearing edges of said teeth,-` saidjreeesses being symmetriealfwith respect 'to said opposite faces.

5A vibrating cutter blade for a sheep shear and the like, consisting of a metal plantev odi uniform thickness throughout, whereby t-he opposite faces are in parallel lanes, teethy projecting from a MICHAEL. W. MCARDLE.,

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