US1469684A - Knife sharpener - Google Patents

Description

Oct. 2, 1923. 1,469,684

7 AQOLSON ET AL KNIFE sHA'RPENER Filed April 11. 1922 [mm/22 013", 7 AM] 01am A l 1'! Had]? Z e A7350; 6y

post may thus be firmly secured in the seat, it eing' obvious that a vertical sliding niovement' thereof will change its relative posi tion with respect to the post 5. As the angle lof inclinationof the wall 16 is very slight, a minute adjustment of the relations between the two uprights is had. 7

The top of the post 16, is an exact duplicate of the top of the standard so that the disks may be interchanged from one post to the other. I V 'Thedisks'are exact counter-parts of' each other, one disk'running with'its periphery immediately adjacent the flat face of the other, the standard being disposed on the base plate accordingly to permitfthis arif ture described in the foregoing. Bymaking the disks"interchangeable as described, both flat faces of the disks are available for use as well as the peripheries thereof, thereby materially eXtending the usefulness of the device and the intervals forrenewal of disks. Itwill be noted'that by mounting one disk to} have its outer side flush with the periphery of the other thepoints of contact between the cutting edge of the knife and the two inner peripheral edges of the disks are appreciably separated, as distinguished from rollers where the two-peripheral c0rnei'sjaife contiguous andthe knifeis drawn diagonally between them. In other words,

the point at which the shaving is being cutj from one side of the cutting edge of. the knife is spaced longitudinally a dis- 'tance equal to the .full thickness of either,

disk thereof, from point atl'whic-h the shaving is'heing cut onthe opposite side of'the knife edge. The advantage of thus having these points spaced an appreciable distance from one another, enables the operator to slightly move the knife laterally in a sharpening operation to thus secure a leverage tending to separate the wheels and thereby secure a relatively heavy pressure against the cutting edges-of the wheels concurrently with a drawing movement of the knifeovei the same. We havefound that this enables the corners of thedisks to take abetter hold on thest eel for removing an unbroken sliav ing therefrom. 1 n 'In Figure 3, a; designates a knife blade, the cutting edge thereof being here shown wedged-between the periphery of one and {the face of the other .disk,and being drawn 7 p 7 l toward the user as indicated by the arrows; 3. In a device for sharpening knives, a:

, a sharp edge.

in Figure 1, wherein the knife is indicated in dottedl lines. Thus, the disks abrade the knife edgesimultaneously on opposite sides.

lVhenthe knife is pushed away from the user in a return stroke, the outer cornerref that disk which rolls on the side of the other, and the inner corner of the disk upon whose-side the first named disk rolls, will shave the cutting edge of the knife on opposite sides simultaneously and thus effect When the user drawsthe knifein a direction intersectingtl'ie ninety degree angle between the inner faces of both disks, then the inner circular corner-of that disk rolling on the side of the other, will shave one side of the cutting edge, andthe inner corner of the disk whose side is rolled upon, will shave theothe r side of thecutting edge of the knife with itsiinneriperipheral' corner. It will be noted itha'twhen the knife is drawn ma diagonal direct on, as ustJdescribed, the points-on the ed-g e' ofthe knife actedupon simultaneonsly by the two disks are appreciably separated, which separation.

isdue to the mounting'fof the disks so that one will roll 'on the side of the other. Further, when the knife is drawn over the disks ina sharpening operation, especially in'a diagonal direction, the disks are engaged at a point located on a level a trifle above their centers of rotation, thus causing the, down pressure on the knife exerted by the-user to rotate the disks slightly concurrently with a sharpening movement, and thus place a new cutting portion of the peripheral'corners of the respective disks in play. VVe'claim:

1. In a deviceforsharpening knives,iin

combination, a base, a pair of steel disks'eac'h of uniform diameter and havingflatfsides to form peripheral knife; sharpening c0r 11ers at the juncture of the periphery with said sides, said fdisks being mounted and arranged on said 'baseto be normally rotatable, respectively, in vertical planes at right; angles to each. other, andhave the inner per pheral knife sharpening corner of one disk 2. In a device for sharpening knives, a

base, a pair of metallic disks-'rrotatably.

mounted on said base torotate respectively m vertical plane'swat right angles to each other, so that the periphery of one diskwill roll on the face ofJthe other disk at; a point close tofthe outer edge ofthe' latter,flthe mounting of said disks including an adjust-- ablesupport for that disk which rolls bn the; other, said 'support'being adjustably movable in a vertical plane in a diagonal diiection relative to. the other disk.

base,- a pair of sharpening disks, rotatably mounted on said base to rotate respectively in vertical planes atright angles to each other, so that the periphery "of one disk will roll on the face of the'other disk at point close to the outer edgesof the latter,the mounting of said disks comprising awsupporting postfor each disk, each post having a readily removable outwardly extendingbearing member for rotatably supporting its. 1 respective disk, said, bearing member having a disk-shaped head, at its :outer free i end, and a countersunk cavity 'tofwholly receive said diskshapedhead in either side of each of said disksfto thereby render the disks reversible.

, 4. In a device for sharpening knives, a base,,a" pair of 1 metallic disks ro-tatably mounted on said base to rotate respectively 1 recess of their respective disks.

in vertical planesiat right V'angles to each mounting of said disk comprising afisup porting post for each disk, each"postv having bearing In testimony whereof-We affi x oursi -f b natures. I

- A LOLSQK-p.

ALFRED I other, so that the periphery of on'e disk'will 1 l roll. on the faceof the other disk at 'a point 1 r close to the outer edge of the latter, the

Images