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July 16, 1946. ‘ J_ |__ BARNES KNIFE SHARPENER ’ 2,404,025. ‘ Filed 061;. 6, 1944 14‘ A‘ llilll l HM INVENTOR. Jase/v71 L. Barnes Patented July 16, 1946 2,404,025 UNITED STAT ES PATENT OFFICE ‘ 2,404,025’ KNIFE SHARPENER Joseph L. Barnes, Indianapolis, Ind. Application October 6, 1944, Serial No. 557,427 5 Claims. (Cl. 76—86) 1 My present invention relates to a knife sharpener of the kind having a pair of rotary ?les between which the knife blade may be drawn for 2 the balls contact each other. With respect to those types of sharpeners having rotary ?les pro vided with three ?les instead of two, my arrange ment eliminates the necessity of the third ?le. The teeth I8 may be considered as cutting in One object of the invention is to provide a knife one direction, that is when the knife is drawn sharpener of simple, durable and inexpensive con downwardly in Figure 3. I provide a wedge-like struction comprising a base and a pair of rotary stop or holding pawl 24 coacting with the ?les ?les or other suitable abrasives, mounted thereon. which is spring-pressed downwardly in Figure 3 Another object is to provide a means to permit rotation of the ?les in one direction and prevent 10 by a spring 26. The stop 24 ?oats on a pin 28 extending upwardly from the base l0 and, accord their rotation in the other direction as a knife ingly, as the knife is drawn toward the user, the blade is reciprocated between them. stop wedges in between the rotary ?les and they Still another object is to provide a knife sharpening it. sharpener which can be easily used by any un are held so that their cutting teeth l8 act upon skilled person and operated merely by a recipro 15 the knife to sharpen it. When the knife is pushed away from the user, the friction between the cating motion of the knife blade while held be knife and the ?les will rotate the ?les (clockwise tween a ‘pair of rotary ?les. for the right hand one and counter-clockwise With these and other objects in view, my inven for the left hand one), this being permitted by tion consists in the construction, arrangement and combination of the various parts of my device 20 the holding pawl 24 backing up due to such rota tion. Thus the teeth 13 act only when the direc whereby the objects contemplated are attained, tion of travel of the knife blade relative to them as hereinafter more fully set forth, pointed out in my claims and illustrated in the accompanying is such that they can cut metal therefrom, and the device is automatically operable with only drawing, wherein: Figure 1 is a plan view of a knife sharpener 25 the requirement that the knife blade 22 be held embodying my invention and showing in dotted down between the ?les and reciprocated. lines the relation of a knife thereto while being Abrasives other than ?les such as carborundum sharpened. or the like may be employed and other changes Figure 2 is a front elevation of the knife may be made in the construction and arrange sharpener showing a knife blade in section, and 30 ment of the parts of my device without departing Figure 3 is an enlarged sectional view on the from the real spirit and purpose of my invention, line 3—3 of Figure 2. and it is my intention to cover by my claims any On the accompanying drawing I have used the modi?ed forms of structure or use of mechanical reference numeral ill to indicate a base which is equivalents which may be reasonably included preferably rigidly mounted on a table or cabinet 35 within their scope without sacri?cing any of the top as by countersunk screws I2. advantages thereof, The‘base it has a pair of shoulder rivets l4 I claim as my invention: extending upwardly therefrom which are peened 1. In a knife sharpener of the character dis as at [B to retain them in position. On each rivet a rotary ?le I6 is journalled. The shouldered 40 closed, a base, a pair of rotary abrasive elements thereon, said abrasive elements being shaped as character of the rivets prevents any binding of the frustums of cones and having intermeshing teeth ?les and permits them to rotate freely. at their lower edges, and wedge means for permit The ?les I6 are provided with teeth It as illus ting rotation of said abrasive elements in one trated in Figure 3 and the teeth of one ?le point clockwise while those on the other point counter 45 direction and preventing their rotation in the opposite direction, said wedge means being con clockwise. The ?les l6 are in the shape of cone strained to wedging position between said abrasive frustums to bevel the sides of a knife blade as elements. indicated at t8, the blade itself being designated 2. A knife sharpener comprising a base, a pair 20.‘ The teeth i8 as will be noted in Figure 3 mesh with each other so that there is an over 50 of frustum shaped rotary abrasive elements thereon. having teeth meshing with each other at lapping of the peripheries of the ?les at their the bases of the frustums, and a holding pawl lower ends as shown in Figure 2, thus presenting spring urged to wedgebetween said elements and ?le faces entirely down to the lower sharp edge stop their rotation as a knife blade is drawn be of the knife blade. This eliminates the “wire” edge caused by ball types of sharpeners wherein 55 tween them and to release and permit their rota 2,404,025 3 4 tion as the knife blade is pushed in the opposite direction. 3. A knife sharpener comprising a pair of ments for permitting of their rotation in one direction and preventing their rotation in the opposite direction. frustum shaped rotary abrasive elements having 5. A knife sharpener comprising a base, a pair teeth meshing with each other at the bases of the of frustum cone shaped rotary abrasive elements thereon, and a holding pawl spring urged to wedge between said elements and stop their rotation as a knife blade is reciprocated between them in one frustums, and a. holding pawl to wedge between said elements and stop their rotation as a knife blade is drawn between them. 4. In a knife sharpener of the character dis closed, a pair of rotary abrasive elements, said elements being frustum cone shaped, and a wedge biased to frictionally engage between said ele direction and to release and permit their rotation as the knife blade is reciprocated between them in the opposite direction. JOSEPH L. BARNES.