US1015148A - Knife-sharpener. - Google Patents

Description

APPL

R. J. DEARBORN. KNIFE SHARPENER.

IGATION FILED TEB.23, 1911.

Patented Jan. 16, 1912.

` which RICHARD J'. DEARBORN, OF BEVERLY,

FFlE.

MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO CHARLES B. DEAN, OF BOSTON, MASSACHUSETTS.

KNIFE-SHARPENER.

Specification of Letters Patent.

Patented J an. 16, 1912.

Application led February 23, 1911. Serial N 0.610,318.

To all whom t may concern:

Be it known that I, RICHARD J. DEARBORN, of Beverly1 in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Knife-Sharpeners, of which the following is a specification.

This invention relates to a knife sharpener "having two circular sharpening members located side by side and provided with peripheral ridges or projections formed as metal planing cutters, the members being in contact with each other so that portions of said vcutters constitute the sides of a tapering recess between' the members through a knife blade is yadapted to be moved longitudinally,.such movemeiit of the blade causing the cutters to exert a planing action 0n the opposite sides `of the blade at and above the cutting edge formed by their intersection.

The object of the invention is to provide a simple, durable and effective sharpener of this character, the sharpening members of which arel so confined that they may be rotatively vadjusted to bring their differ-` ent ortions into operative position.

T e invention consists inthe improve` ments which I will now proceed to describe andclaim.

Of the accompanying drawings which form a part of this speciication:;Figure 1 represents a plan view of a Sharpener embodying my invention; Fig. 2 representsa side view of the same Fig..3 represents a section on line 3 3 of Fig. 1; Fig. 4 represents a side view showing the cutting members on a larger scale. Fig. 5 represents a view similar to Fig. 4 showing the central portions of the sharpening members of greater-diameter than their end .port-ions; Fig. 6 represents a section on lineG-G of Fig. 4:; Fig. 7 represents al view similar to Fig.' 6 showing a modification.

Similar reference characters indicate the same or similar parts in all the figures.

In the drawings, 12, 12 represent a pair of cutting members of hardened steel, each being of circular form in cross'section and preferably made of a single piece which may be hollow or tubular, as shown by Fig. 3. The periphery of each member is grooved to form a plurality of peripheral cutting edges 13 adapted to actas metal planing cutters in removing minute shavings of ma- ',The formation of the ened. The abutment 21 may terial from opposite sides of a knife blade 14, the edge of which is inserted in the recess formed by the adjacent portions of the members, as indicated edge 13 is preferably formed by the intersection of a face 15 which is in a plane substantiallyI at right angles with the axis of the member 12 and a face 16 which is frustoconical and inclined relatively to said axis. intersecting sides which form the cutting edges 13 may, howe ever, be different from that shown and each of said faces may be inclined relatively to the axis of the member on which it is formed if desired.

The members 12 are coniined loosely side by side in a holder having means for preventing removal of the members in any direction and formed to permit the insertion of a knife edge between them and a movement of said edge in a direction parallel with the axes of the members. The holder here shown comprises a base 1T, a fixed abutment 19 having an inclined inner face 19 on which 011e side of one of the members 12 bears, and a fixed abutment 21 having an inclined inner face 21a, said faces 19a and 2 1a forming two sides of a chamber in which t-he sharpening members are located. The inclination of the faces 19a and 21a and the distance between them, are such that the sharpening member'sare held in contact with each by the said faces when dropped into the chamber, the members being loosely confined so that each is free to turn and to adjust itself to the blade which is being sharpbe provided with a screw 22 adapted to bear against the outer side of 011e of the members 12. vSaid screw is not intended to clamp the members rigidly, its object beingto compensate for any imperfections or variations in the diameter of the members, and insure a light but not a binding contact with each other and at the same time allow each a certain freedom of movement. so that the members may adjust themselves to the blade, and are free to be partially rotated to bring fresh parts of their cutters into operative position. The screw 22 may be omitted if desired. The holder is provided with a hood 23 which is detachably secured by a screw 24 to the base 17 and is bent to extend across t-he ends and the upper portions of the members 12, thus preventing endwise and outby Fig. 3. Each cutting 'Ward removal of said members, the hood forming the top and ends of the chamber whereof the abutments 19-21 form the ends. The hood is provided with a recess or opening 25 Which is formed to expose the acting portions of the cutters and permit the longitudinal movement of a knife blade between the same. The base and hood constitute a chambered holder, the parts'whereof are separable. The base 17 may be adapted for attachment to a table or other support, or it may be provided With a handle 26 adapted to be grasped by one hand of the operator.

The members 12 are arranged so their cutters 13 slightly overlap and alternate, as indicated by Figs. 1, 4, and 5. Fig. 5 shows the members of slightly greater diameter at their central portions than at their ends. While I prefer to make .each member 12 in one piece, as indicated by Fig. 6, it may be made of a number of separate pieces located side by side, as indicated by Fig. 7, each piece being separable from the others. The cutters constitute parallel ridges on the surfaces of the sharpening members, and as shown by Fig. 5, each ridge is endless and is independent of the others. It is obvious, however, that the cutters of each member may be the convolutions of a helical ridge, instead of being formed by independent endless ridges.

I claim 1. A .knife Sharpener comprising a holder composed of separable parts forming a chamber, one of said parts having a knifereceiving opening communicating With the chamber, and a pair of circular sharpening members loosely depositedin said chamber and confined against displacement by the 40 Walls thereof, the members being held in contact With each other by opposite sides of the chamber, and each having a plurality'of peripheral planing cutters.

2. A knife Sharpener comprising a base having fixed abutments Whichform opposite sides of a chamber, a pair of circular sharpening members loosely deposited side by side in said chamber, said members bearing at their outer sides on said abutments and beingV held by the abutments in contact With each other, each member having a plurality of peripheral planing cutters, and a detachable hood completing said chamber and adapted to prevent removal of the cut-"

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