US932586A - Device for sharpening shears. - Google Patents

Description

G. P. SHEFFIELD. DEVICE FOR SHARPENING SHBARS. VAPPIIIOAPTION FILED HA3. 1, 1907.

932,586, PatentedAug.31,1909.

and by dotted lines..-

upper abrader, detaclied,with a rem'ovabley q mnvreesonsmim nnme SHEARS'.

Specification of Letters Patent.

Patented Aug. 3 1', 1969;

Application fil ed March 1, 1307; Serial ire-360,098.

To all whom it may concern:

Be it known that 12, GEORGE'P. SHErFiELD, of Rochester, in the county, of Monroe and State of New York, have'invented a-new and useful Improvement irrDevices-for Sharpening? Shears, which improvement is" fullyset forth in the followingspeoificationand shown in the accompanying drawings. f

My invention is an improved device for quickly and conveniently sharpenirig v shears by passing the: blades of the shears across the surfacesof abraders, both blades being. sharpened simultaneously. I f One object of the invention; among others, is to provide a pair of coacting pivot-alabrade'rsthat willadjust themselves to the changing angle or position of theconvergent edges of the shears as-the latter is moved across their roughened surfaces;

Other objects and advantages of" the in-: vention will be brought out and made to ap pear in the following description, and the novel features pointed out in theappended claims, reference being: bad to the accompanying drawings: which, with the reference characters marked thereon, forln a part of this: specification. V r

Figure 1 is a a front elevation of the device ready foruse; Fig.- 2 is a: cross section? of parts taken on the d'otte'd linea in Fig; 1, the abraders beingfshownin twoipositions by full Fig.3 is a plan of the part shown-in dotted-lines Figeiisan end view of the abra'ders, and thespindle in: cross section, showing the devicesas in use, arts being shown invarious positionsby ful and by dottedlines. Fig.5 isa planoft=hec'i-rc'u l'ar metal head, showingithe cavity, thespin dle beingfin tr "nsverse section. Fig; G'is an elevation of the'shiftable gage, the associ- Fig. 7* is aplanof an orti'on of the "rear'faceof the upper abrader, roken away to'show; the under side of the gage. vatioirof' parts at oneend of the device seen: in a direction opposite to that inwhi'ch Fig. 1 is seen, partsbeing in central longitudinal section:

Referringxto the parts shown; [1- 1 are ap'air' of similar abraders, commonly thin rectangular'pla-tes-of hardened steel having their op erating'facesmaderough as by being grooved ve'ni'ent use of thed'evi'ce to be seizedby the left hand, a reduced part of which enters'the hollow of the headBycommonly oval'in form, and made" rigid therewith. An ornamental knobx6, Figs. 1 and 8*, is also usually pro vided entering the hollow of the circular head 4 and adapted to turn therein.

Fig; 8" is arear ele- Theh'ea'dsB, 4*, the handle5 andtlieknob' 6 are coaX-ial' and joined by an axial shaft or spindle- 7, Figs: 1', 2, 4', 5 andt8, a transverse pin:8,Fig. 1-,servingto hold theliandleand f the head 3 rigid withflthespindle. f die is commonly made fl tat itsoverh'anging The spinend,the head 4; being formed with acentral opening correspondingly shaped, so the head mayno't turnon' the spindle to the end that 3 the rests for the-trunn1ons'2 of the abrader's may be kept directly opposite the respective The extreme end and theknob '6 is rests'i'n the oval head 3.

of the spindle is: threaded 9 provided with'ascreW-Hrit 9, Fig. 8 rigidly in place, to engagewith said threaded part of- 3 the spindle, by meansof which the knob and the head l may be removed fromt'l're spindle forthe purpose ofrenewing the abraders or for other purposes; When replacing the abradersthe trunnionsZ at'theprop'er ends are insertedin the rests inthe head 3 and the head 4: is slip-ped upon'the s indle to receive the opposite trunnions. he knob 6 with j the nut 9 being turnedto place onthe spin i one serves to press the" head 4 against the abraders-,-shoulders 10,-Fig. 8, at the ends-of ated abrader being. in: transverse sectiona the" flattenedsurfaces of the spindle, serving as stops for the head, the abradersbeing leftfreeto turnonflreir trunnions 2.

An inspection of Fig; 4 will clearly reveal f the manner 'of usingthedevice; The shears, l ltiare opened and their edges passed upon and across the" roughened surfaces ofi thea-braders, which cut away thematerial, like a file,'leavingtheedgesof the shearssh ar ,fie rv As the i shearsareimoved enemy or the other, as the blades oftlle shears being pressed against the .abrading surfaces;

case may be, across the abraders and the angle between the blades varies in consequence,

the abraderswill correspondingly rock on their trunnions, as indicated in the figure, and so keep their roughened surfaces flat against the edges of the blades. This I regard asan important feature of the invention as by this construction and by these means both blades of the shears are sharpened simultaneously and alike. 7

7 When the abraders turn in either direction to have their edges meet at either side of the spindle 7 they touch, at their rear sides, the surface of the spindle, as appears in Figs. 2 and 4, which constitutes a stop for limiting their rocking motions either way. The spindle thus stopping the motions of the abraders also serves to cause them to meet truly and evenly at their edges, as appears in Fig. 2, and prevent them from taking positions in whic the edge of one will lap over or pass the other.

In this device for sharpening shears I employ, also, blocks 12 12 of some fine abrading material or granulated substance as corundum, fine emery, or the like, to give to the blades of the shears finer and smoother cutting edges after rubbing them across the metallic abraders 1, as stated. These blocks are, as a matter of convenience, formed with slanting edges and inserted in corresponding transverse dovetail openings or recesses formed in the abraders, the latter constituting tilting elements or holders for the granulated blocks.

With this device I also employ a gage 13, I

Figs. 6 and 7, by'means of which to give the desired slant or bevel to the edge-surfaces of the shear blades. This gage comprlses a body 14, as of hard wood, with eccentric, inclined periphery, held by a threaded stud or screw 15 r1g1d in a sprin holder or elastic e edges of the upclamp 16 formed to clasp t per abrading plate 1, as shown. The gage may be slipped laterally along the holding abrader to any position desired, the body 14 bein made temporarily rigid in position on the c asp 16 at any time by a thumb-nut 17 on the stud 15. The curved face of the body 14 being of spiral form causes the body to present variousslants or degrees of inclination as it is'turned on the stud 15. In use,

when sharpening shears, the fiat face 18 of the blade u permost is placed squarely against the s ant side of the. body 14 when being passed across the abrader, which serves to give to the narrow cutting edges of the blades the desired transverse incline or slant.

It is'clear that the manner of roughing the abrading surfaces of the elements 1 1 is not essential to this invention, this being a matter of judgment, or of convenience in given cases. In Figs. 1 and 3 the abrading surfaces are represented as being out something like the cutting of a float file; and this cutting may be done in a manner to have the sharp ridges or teeth incline laterally one way or the other so as to sharpen shears by pushing them onto the abraders or when pulling them off, as the case may be, the teeth being ada ted to act in only one direction. Also, a p ain head, as indicated by the reference figure 4, may be substituted for the head 3 if found convenient and desirable in constructing these sharpening devices. Other simple details of construction may also be varied or changed without departing from the s irit of the invention.

W lat I claim as my invention and desire to secure by Letters Patent is 1. A device for sharpening shears, having head portions connected by an axial spindle,

and a pair of pivoted gravitating abraders held by the head portions.

2. A device for sharpening shears, having a pair of coaxial heads, a spindle connecting the heads, a pair of gravitating abrading plates formed to have bearings in said respective heads, said plates being held to gravitate in opposite directionsto have their adjacent edges meet on either side of the spindle. I

3. A device for sharpening shears, having a pair of heads and a central spindle joining the heads, a pair of gravitating abraders held to tilt laterally between the heads, said abraders having parallel axes, and being adapted to turn in positions to meet at their edges and to rest against said spindle in their tilted positions.

4. A device such as described, having a handle with a head, a spindle rojecting axially from the head and rigid therewith, a head pierced by the s indle at its op osite end and adapted to slid e upon the s ind le the latter being screw-threaded, and a mob with threaded nut to turn on the spindle in engagement with its threaded end to press said slidable head toward the opposing head, sto s on the spindle for the movable head, an gravitating abraders pivoted between said opposing heads to assume opposite positions y gravity.

5. In a device for sharpening shears, a spindle having a handle at one end; a head on the opposite end of the spindle; and a opposite end of the spindle; and a pair of gravitating abraders pivoted between said my hand this 27th day of February, 1907, in gandle danddheaml b the saidh spindle 1being the. presence of two subscribing Witnesses.

ispose mi Way etween t e pivota axes of the abraders and beingof a, size to form v GEORGE SHEFFIELD 5 a stop for limiting their rocking motions in Witnesses:

both directions. E. B. WHITMORE, In witness whereof, I have hereunto set A. M. WHITMORE.

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