US2508967A - Blade sharpener - Google Patents

Description

May 23, 1950 J. J. ORIELLY BLADE SHARPENER Filed March 26, 1948 INVENTOR. J01 J O'Rzqzllg A. a Q

BY W A TTORNEY Patented May 23, 1950 UNITED STATES PATENT OFFICE BLADE SHARPENER John J. OItielly, Los Angeles, Calif. Application March 26, 1948, Serial No. 17,165

2 Claims. (Cl. 51-210) This invention relates to a blade sharpener and has relation more particularly to a device of this kind especially adapted for use in connection with a blade having a beveled cutting edge.

Primarily it is an object of this invention to provide a device of thishkind embodying means whereby the abrasive action of the same on the work is such to assure the maintenance of the original degree of the bevel of the cutting edge and thus assure the blade retaining its desired efiioiency. H

It is also an object of the invention to provide a device ortool of this kind which substantially eliminates burring or roughenlng of its work which would otherwise interfere with the cutting action of the blade, more especially when such blade is comprised in shears or the like.

Another objectof the invention is to provide an article or tool of this kind wherein the abrasive or working element is mounted for free rotation as the tool or device is drawn along the blade, thus avoiding grooving of the working edge of the abrasive element and which grooving would materially impair the efiiciency of the device or tool. r I p .A still further object of th invention is to provide a device or tqol of this kind which is manually operated and wherein the abrasive element constitutes the only movable part.

With the above and other objects in view, the invention consists in the details of construction and the arrangement of the several parts to be hereinafter described .and. more particularly claimed.

In order that the invention may be the better understood, reference will be had to the accompanying drawing wherein like characters of reference refer to similar parts, and wherein Figure 1 is a view in perspective of an abrasive tool constructed in accordance with an embodiment of the invention and in working position with respect to a blade.

Figure 2 is a view in top plan of the tool as illustrated in Figure 1.

Figure 3 is a sectional view taken substantially on the line 3-3 of Figure 2, and

Figure 4 is a sectional view substantially on the line 4-4 of Figure 2.

Figure 5 is a detailed sectional view taken substantially on the line 5-5 of Figure 2.

In the embodiment of the invention as illustrated in the accompanying drawing, H denotes a. handle member of desired dimensions and preferably of a size to be easily and effectively grasped by a'hand of a persona-The handle member H, as herein comprised, is substantially U-shaped in cross section from end to end and includes the parallel side walls or plates I, and an intermediate or central connecting portion 2, shown in the accompanying drawings from end to end on an outbow curvature of desired radius to facilitate the grasping of the handle member.

; The forward endof the portion 2, is continued by an extension plate 3, disposed outwardly and downwardly on an angle of substantially the same degree as the degree of angle of the bevel a of the blade 13 in connection with which the device or tool is intended to be used. In the drawings the blade B is shown as being com prised in a pair of shears, but it is. to be understood that a device or tool embodying the present invention can be employed with advantage in connection with other types of blades wh rein such blades have'a beveled'cutting edge;

Asshown in the accompanying drawings, the extension plate 3 is substantially circular in plan and is integral with the'portion 2 of the handle member H and the arrangement is such that the handle member H with the extension 3 can be readily produced in a single operation from one piece of sheet or blank of material possessing the required strength so that such structure is substantially non-flexible. a

- The plate 3 is formed to provide a central flared depression in its top side and an opening 4 in the bottom thereof and an annular channel or groove 5 in its lower side, which is substantially concen tric to the axis of the opening 4. The outer wall b of the groove 5 extends a material distance below the inner wall 0.

In the assembly of the article or tool, the outer or extended portion of the wall D closely surrounds the inner portion of an abrasive element A, or more particularly the backing plate 6. This plate 6 is of such material possessing required strength and rigidity. Rigid with the outer face of the plate 6 is the working disc or stone 1, of any abrasive material of proper quality and which has the peripheral portion d of its under face flat and substantially concentric to the axial center of the element A.

The securement of the disc or stone 1 to the plate 6 is shown in the accompanying drawings as by an interposed adhesive lamination 8 so that the peripheral portion of the outer face of the plate 6 will be smooth and unbroken to provide proper contact therewith of the anti-friction elements 9, herein disclosed as ball bearings,

3 These elements 9, have desired engagement with the race-way afforded by the annular groove 5 so that the applied abrasive element A may have desired rotation with a minimum of frictional resistance.

Freely directed from above through the opening 4 of the plate 3, is a headed shank l0, herein disclosed as a conventional type of bolt. This member or bolt [0 threads downwardly through a flared nut 14, seated within the depression, through the opening 4 and into an apertured boss l l formed centrally on the upper side of the plate 5. The shank or bolt It) serves to hold the plate 6 of the element A in effective contact with the elements 9 and the axial length of the open ing 1 l', which is open at both ends, and the length of the shank or bolt in is such whereby contact of the inserted end of the shank or bolt l0 direct with the back face of the disc or stone 1 will prevent such contact of the head I: with the marginal portion of the opehiieg 4 which would interfere with the desired free rotation-or the abrasive element A. H

in practice the handle member H is grasped in the hand of the user and the end edges e or the walls'oi' plates 1 are placed against the face of the blade 13 at the low side of the bevel it with the portion a of the member A in contact with the bevel a. As the edges e are substantially at right angles to the longitudinal-aiiis oi the handle member A,- it will be assured that the face a will be entire required when determined by the angl s-r the bevel a. This'is further assured as th face d i nap and in "pl'ahe substantially at right angles t the fixi'sbffih member A. t is also to be understood that the face at isof a width in excess of the width of the bevel a to assure best results. 7 r V After the article ortool has been initially applied to the blade, it is moved can; and forth along the blade and such strokes result in the disc or stone 1 having both a sliding and rotating cohtact with the bevela under suchpressure as app i dtbr. so aisrssqe 'Qr cried the face of the bevel a to efiectively sharpen the same without purring or roughening the bevel a or w i s fa ade v i i.

. h s a k e bolt 0. is passe h qusha aring washer H of a cross sectional configuration to fit snugly and freely within the outer enla ed end portion of the opening ll and with which the head 12 of the applied bolt or shank ,lfl contacts from above. This bearing washer l4 facilidepression; a

top side of the forward end of said handle, said element being formed with a central flared and a'iitr-iid depression in its top side and an annular-channel in its lower side concentrically of said depression, a flared nut seated within said serew through said nut and projecting freely through said aperture, a circular plate supported by said screw below said element, ball hearings in said and rlliiig coarser with said plate; and an abrasive disk secured on the lower side of said plate; the angular relation between the lower side or said disk and the adjacent end of said handle coinciding with the angle of have of the cuttiiig'edge' of the blade to be sharpened.

'2. The invention "as defiiied in claim 1; with the said handle and said circular element of unitary construction, the same being termed of a strip or sheet metal with the handle portion con stitiited in a-inaior leh'gth of the strip bent loh gitudinally to inverted U-shape in cross-section, and said circular element reconnected to the adjaeen't end of the handle pdition bya transversely folded portion which is' curved to form a conurination or the out-er side sent; the said (shahnel.

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CITED ,r iiowii g references are of retard in the file of this patent:

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