US1541835A - Shears sharpener - Google Patents

Description

- June 16, 1925. 1,541,835

J. E. M KINLEY SHEARS SHARPENER Filed Feb; 24, 1925 INVENTOR ATTORNEYS Patented June 16, 1925.

UNITED STATES PATENT OFFICE.

JOHN EDGAR MOKINLEY, O]? OAKLAND, NEBRASKA, ASSIGNOR OF ONE-FOURTH TO ROY BOWEN, OF OAKLAND, NEBRASKA.

SHEARS SHARPENER.

Application filed February 24, 1925. Serial No. 11,282.

To all whom it may concern:

Be it known that I, JOHN E. MOKINLEY,

a citizen of the United States, anda resident of Oakland, county of Burt, and State of Nebraska, have invented a new and useful Improvement in a Shears Sharpener, of

which the following is a full, clear, and exact description.

My invention relates to improvements 1n shears sharpeners, and it consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide a shears sharpener in which means is pro vided for producing a uniform and accurate cutting edge to a pair of shears or the like.

A further object of my invention is to provide a device of the character described which is adjustable for sharpening shears having blades of various sizes and cutting edges at various pitches.

A further object of my invention is to provide a device of the character described 1n which means is provided for permitting the guiding and movement of the abrasive and sharpening means at all times transverse to the cutting edge throughout the entire length of the cutting edge.

A further object of my invention 18 to 0' rovide a device of the character described in which means is provided for supporting and holding a hone and a file each when used in the same relative position to the cutting edge of the blade of the shears secured in the device.

Other objects and advantages will appear in the followin specification, and the novel features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings, forming a part of this application, in which Figure 1 is a side elevation of an embody ment of my invention,

Fig. 2 is a top plan view of the device shown in Fig. 1, and

Fig. 3 is a fragmentary view of the inner face of one of the clamping members for the shears blade. r

extending downwardly therefrom and a clamp screw 3 with-a thumb grip 4 for securely clampin the bod member 1 to a support-mg surface 5 suc as a table edge or the like. a

The body member 1 has an upright post 6 formed integral therewith which terminates at 1ts upper end in one of a pair of vise members 7, see Fig. 2, a complementary vise member 8 having its inner wall curved as shown at 9 is provided and is held in operatlve engagement with the members 7 by adjustable means comprising a bolt 10 and, wing nut 11, the bolt being projected through each of the members so that when the wingnut 1s tightened one blade 12 of a pair of shearsmay be securely held between the vise members 7 and 8.

Means for alining the cutting edge 13 of the blade 12 so that it may lie above and parallel with the vise members is provided 1n a cam member 14 mounted upon a threaded shaft 15 which is projected through the vise member 7 and rotatably mounted therein. A thumb-screw 16 is provided for the shaft 15 by means of which the cam member 14 may be held in any one of a plurality of positions, see Fig. 3. Tiny cavities arranged in arcuate alignment with the outer end of the cam member 14 as shown at 17 are provided in the inner face of the vise member 7 and a projection is formed on the inner face of the cam member 14 which is received in the cavities 17 respectively dedisposed on the stem 19 so as to secure the stem against movement relative to, the arm upon the tightening of the nut 20.

A horizontal guide bar 21 is supported at the upper end 22 of the stem 19 The normal operative position of the guide bar 21- is parallel with the cutting edge 13 of the blade 12. Upright stop members 22 are formed at each end of the guide bar 21 for the purpose hereinafter described.

A combined file and hone supporting member 23 is provided and has a handle port on 24 at one end thereof by means of which the member may be manually gras d and actuated. The outermost end of e body member 23 is provided with a relatively fiat portion 25 which is adapted to rest upon the oids .member' 21. Thls portion 25 has a ongitudinal slot 26 therethrough so as to reduce friction u on the guide member 21 to a minimum w n the device is in operation.

The member 23 has a cavity extending longitudinally thereof, as shown at 26, into which a hone 27 is placed. The cavity is so constructed as to permit the work engaging surface 28 of the hone to lie substantially contiguous with the adjacent outer surface of the member 23. Clamping means 29 associated with the member 23 is provided for removabl securing the hone 27 in the cavity 26. l lolding members 30 and 31 fixed to the member 23 at the-opposite ends of the cavity 26 effectually prevent lateral dis lacement of the hone while in use.

second cavity 32 is provided in the opposite face of the member 23 and is shallower than the cavity 26, and is for the purpose of receiving the ordinary t pe of bastard file 33. [This type of file is well known in the art and has serrations which cross, certain of the serrations being disposed longitudinally of the file. A clamping member 34 including a thumb screw 35 is carried at the inner end of the member 23 by means of which the file 33 is removably secured and held in place in the cavit 32.

From the foregoing description 0 the device the various parts thereof may be readily understood. The first step in sharpening a shears blade with my improved sharpening device is that of placing the blade 12 between the vise members 7 and 8 and securing the blade with its cutting edge 13 parallel with and above the upper edge of the vise members. This is done by adjustment of the cam member 14 and by fixmg the position of the cam member against movement by tightening the thumb-nut 16. Next the wing-nut 11 is tightened upon the bolt 10 to draw the vise members together, thus securely holding the blade in the proper position for sharpening.

It is then necessary to determine the angle, of the cutting edge 13 which may be done by placin the body member 23 with its file and one thereupon in the osition shown in Figure 1, and in elevating the guide member 21 or lowering the guide member by rotation of the stem 19. When the file or hone, as the case ma be, is parallel with the cutting edge 13 t e guide member 21 is disposed in the position shown in Fig. 2 with relation to the blade 12 and the nut 20 tightened.

Let us assume that it is desired to sharpen the blade12 so that its cuttin edge will have a corrugated surface. T is is done with the file 33. Actuation of the member 23 supporting the file will be in straight strokes across the edge 13 and perpendicular thereto. The file should touch the blade only upon the downward stroke and be lifted therefromon the upward stroke. During the downward stroke it is necessary that t e portion 25 of the member 23 contact with and move upon the ide member 21 so as to maintain the inchnation of the cutting edge'13 at its proper angle.

The finishing touches to the edge are accomplished by reversing the member 23 and applying the hone 28 thereto.

If a perfectly smooth keen cutting edge is desired, the file 33 is operated with a slight side movement as it is drawn downwardly and cutting may be down or both the down and up strokes. The finishing or honing of the blade is done in the same manner as applies to the use of the file 33 by reversing the member 23. d

It will be noted that the work engaging surfaces of the portion 25 with relation to the outer faces of the member 23 is identical so that there is no likelihood of cutting the blade of the shears with the file at one angle and with the hone at another an le, even though the'hone is thicker than the lo.

I claim:

1. A device of the character described comprising a vise adapted to grip and support the blade of a pair of shears, an ad- ]ustable guide member disposed at a predetermined distance from said vise and being adjustable as to height, said member having a horizontal supporting surface greater in length than the length of the shears blade and having upturned stop members at each end thereof, and an abradant supporting member having a handle portion for manual actuation, whereby the abradant may be moved across said cutting blade and the member may bear at one end upon and be guided by said guide member.

2. A device of the character described comprising a vise adapted to grip and support the blade of a pair of shears, an adjustable guide member disposed at a predetermined distance from said vise and being ad'ustable as to height, said member having a orizontal supporting surface. greater in length than the len h of the shears blade abradant supporting member having that.

and having upturne stop members at each part adapted to bear upon said guide 10 end thereof, and an abradant supporting member provided with a, cutaway portion member having a handle portion for manual at the mid point thereof thereby reducing actuation, whereby the abradant may be friction between said abradant supporting moved across said cutting blade and the member and said guide member to a member may bear at one end upon and mimmum.

be guided by said guide member, said JOHN EDGAR MQKINLEY.

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