US2454035A - Knife and scissors sharpening device - Google Patents

Description

16, 19'." E. w. LARK 5 KNIFE AND SCISSORS SHARPENING DEVICE Filed April 4, 1946 3 a Fig. 1 2

INVENTOR.

Patented Nov. 1 6 1 948 UN iTED STATE- S PAT ENT OFF liCE 2,454,035 KNIFE AND s'oIss'oRs snaae eume iiizv'i'ce Earl W.' (3lark,'-S*tt1ar t, l la. Application April- 4, ieisjserialnattadis oi.=s'-1- 2 14) 6 Claims. i

My invention relates "to improvements in a knife and scissors sharpening device and is intended primarilyto re-sharp'enblades which have been dulled in ordinary usage. In my invention I preferably use trapezoidally shaped abrasive members and the main objects of my invention are: to guide the abrasive members by rollers or other suitable means which bear directly on integral or prepared surfaces thereon thus eliminating special holding means; another object is to provide individual springs for each abrasive member so they may follow the contour of the knife blade; a further object is to'provide means by which scissors blades may be sharpened on these abrasive members.

I attain these and, other objects by mechanism illustrated in the accompanying drawings, in

which: 7

Fig. 1 is a sectional elevation of the sharpening device taken on line i-l ofFig. 3.

Fig. 2 is an end elevation of the device.

Fig. 3 is a plan view of the knife sharpener.

Fig. 4 is a side elevation ofone of the abrasive members.

Fig. 5 is an end elevation of Fig. 4.

Fig. 6 is a side View of a guide roller showing the turned down necks or journals.

The abrasive member in Figs. 4 and 5 is identical with that shown in Fig. 1 excepting that friction reducing material la is applie'dto a portion of the members.

Similar numerals refer 'to throughout the several views.

The abrasive members i are made up ofabrasive particles held together by a suitable binder, they are made preferably trapezoidal in shape and guide rollers 55 which are journaled in frame sides '2 contact the parallel sides of the abrasive similar parts members i to form roller guides which in conjunction with frame sides 2 which also act as guides permit the abrasive members to be moved freely back and forth in a direction :parallel with their parallel sides. Abrasive members I may be used as shown in Fig. 1, however, I have found that, if a portion of the parallel sides and parallel faces of the abrasive members are given a coating of a paste made of Portland cement and water as indicated by la, Figs. 4 and 5, where the guiding means contacts the abrasive members, the coefficient of friction at these portions is greatly reduced and the wear on the guide rollers 5 and frame sides 2 are greatly lessened. Parts 3 form a base for the frame and rivets 4, which may be replaced by bolts, hold the members of the frame for the sharpening device together.

force for t'ension spring I.

jl-Ielicaltension s'piings l are attached 'atone'end "to frame b'ase by means of holes 32; and the omerenu contacts the abrasive members toyieldingly force same against stops 6. 'StbpslVare carried byframe members zandmaybe-dupli- "cat'es of guide rollers 5. Thesefstop's .6 contact the inclined rin-ding faces of thetrape'zoidally shaped abrasive members and to position the abrasive members that th'ek nife blade lL'as it is brougli'tf'downinknifie g ui'dingslots 211 into contact with' tne abrasive'nfembers, mayror cethe opposing abrasive 'me'nib'ers apart "against the "Afiber "knife Striking piece r: is provided "at thebo'ttom orkriifefguidirig slots Za 'so that knife blade "ll may *not strike any "metal part 'as it is drawn over theinclined grinding "faces of the fabrasive member's.

Knife igui'ding's'l'otsffiz' in fr'am'e "sides "Zare provided "on each side of each abrasive member "to give 'ma xii'rliim guiding for the 'linife"b1ade. "The closely spaced knife slots are particularl useful when sharpeningthe curved'lportion of theblade 'near the point as the curved :pornon iniay'be sharpened t0 'theeiitr'emepoirit while positioned in at least two kn'i'fe guiding slots. "In the drawings I have for simplicity in the drawin'gs'shown any two abrasive members. However, athird abrasive member may easily be added'b'y'le'ng'thening rivets '6 and providing'an additional side land-Tan additional spacer 3 and glJide'rOHers E, stop and spring. With three abrasive members better sharpening of thelblade may be obtained at'the-handle andatthe. point end.

V For sharpening SCISSOIS jbIadGS-I iprovideslots 2b in the outside framesides 2 and notchaway the middle frame side 2 as shown so thatone leaf spring 9 may bevused to hold the scissors blade ill in slot "2b. Pins '-8 which may be duplicates of rollers' 5 hold spring-9 =in.place.

The maximum outward movement ofthe abrasive members as knife blade H is drawn over the entire inclined grinding faces of the abrasive members is indicated by dot and dash lines at both outer and inner ends of the members I.

In my improved sharpening device the abrasive members are easily removed to reverse same to expose a new grinding surface to the knife blade or to replace some by new abrasive members by releasing spring I from in contact with I.

The scissors blade guiding slot 21) is slightly inclined to give a slight rake to the cutting face and the scissors blade is sharpened by drawing the blade through the slot 21) while exerting a slight downward pressure on the abrasive member, substantially the same motion that is used when sharpening a knife blade.

What I claim is:

1. In a knife sharpener: a frame comprising a base havin a plurality of upwardly extending portions, said upwardly extendin portions having transversely aligned vertical knife guiding slots; a plurality of abrasive members disposed between adjacent pairs of said portions, said members having guiding surfaces and inclined abrasive ends, and adjacent members disposed respectively with their abrasive ends in opposite oblique relation to the guide slots and in planes which intersect at the plane of said slots; a plurality of rollers pivotally journaled in and between adjacent pairs of said portions and said rollers disposed to contact the guiding surfaces of said abrasive members to form roller supports and guides for said abrasive members for reciprocating movement thereon.

2. In a knife sharpener: a frame comprising a base having a plurality of upwardly extending portions; a plurality of abrasive members disposed between said portions, said members having outwardly and upwardly inclined abrasive faces and adjacent members disposed respectively with their abrasive faces in opposite oblique relation; a plurality of rollers pivotally journaled in and between said portions and said rollers disposed to form roller supports and guides for said abrasive members for reciprocatin movement of said members on said rollers.

3. In a knife sharpener: a frame comprising a base having a plurality of upwardly extending portions; a plurality of abrasive members disposed between said portions, said members having outwardly and upwardly inclined abrasive faces and adjacent members disposed respectively with their abrasive faces in opposite oblique relation; a plurality of rollers pivotally journaled in and between said portions and said rollers disposed to contact the said abrasive members and to form roller supports and guides for the same for reciprocating movement of said members on said rollers; said abrasive members having friction reducing material applied thereon at points where the said supporting and guiding means contacts same.

4. In a knife sharpener which includes a plurality of pivotally mounted guide and supporting rollers: abrasive members carried on and guided by said guide rollers for reciprocating movement thereon, said abrasive members having their abrading surfaces respectively in planes which intersect at an acute angle and with adjacent members oppositely disposed; spring means urging the oppositely disposed members toward each other to maintain contact of said abrasive members with opposite sides of a knife blade inserted between them; means providing a guide slot for the knife blade, said slot extending in a plane substantially bisecting the angle made by the abrading surfaces of the oppositely disposed abrasive members; stop means fixed relative to said guide slot to contact the abrasive members on their abrading surfaces to position the abrading surfaces at a predetermined relationship as said surfaces ar worn by successive blade sharpening when said blade is not in said knife slot.

5. In a knife sharpener: a frame comprising a base having a plurality of upwardly extending portions, said upwardly extending portions having transversely aligned vertical knife guiding slots; a plurality of abrasive members disposed between said portions, said members having outwardly and upwardly inclined abrasive faces and adjacent members disposed respectively with their abrasive faces in opposite oblique relation to the guide slots and in planes which intersect at the plane of the knife guide slots; a plurality of rollers pivotally journaled in and between said portions, and said rollers disposed to contact and form roller guides and supports for said abrasive members for reciprocating movement of said members thereon; spring members contacting said abrasive members and urging oppositely disposed abrasive members toward each other; fixed stops contacting the inclined faces of said abrasive members to position the abrasive faces, when knife blade is not in knife slot, at a predetermined relationship as said surfaces are worn by successive blade sharpening,

6. In a knife sharpener: a frame comprising a base having a plurality of upwardly extending portions, said upwardly extending portions having transversely aligned vertical knife guiding slots in said portions; an abrasive member disposed between said portions said member having an outwardly and upwardly inclined abrasive face, the plane of which intersects the plane of the guide slots; a plurality of rollers pivotally journaled in and between said portions and said rollers disposed to form roller supports and guides for said abrasive members for reciprocating movement thereon.

EARL W. CLARK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,365,161 Eisenhauer Jan. 11, 1921 1,570,083 Runzi Jan. 19, 1926 1,952,106 Vierling Mar. 2'7, 1934 2,092,443 Crossley Sept. 7, 1937 2,241,412 Meade et al May 13, 1941 2,249,218 Meade et al July 15, 1941 2,262,401 Meade et al. Nov. 11, 1941 2,398,711 Lambert Apr. 16, 1946

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