US1081606A - Knife and scissors sharpener. - Google Patents

Description

W. P. GRAY & J. H. DUNCAN.

KNIFE AND SGISSORS SHARPENBR.

APPLICATION FILED APR. 30, 1912.

1,981,606, Patented Dec. 16, 1913.

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WILLIAM I. GRAY AND JAMES H. DUNCAN, 0F CAMPBELLTON, NEW BRUNSWICK, CANADA.

KNIFE AND SCISSORS SHARPENER.

Specification of Letters Patent.

Patented Dec. 16, 1913.

To all whom it may concern:

Be it known that we, WILLIAM P. GRAY and JAMES H. DUNCAN, residing at Campbellton, Province of New Brunswick, Canada, have invented certain new and useful Improvements in Knife and Scissors Sharpeners, of which the following is a specification.

This invention relates to sharpening devices for edged tools and more particularly to a device designed for use in sharpenlng knives and scissors.

It is an aim of the invention to provide a sharpening device of the type mentioned so constructed that the blade to be sharpened will have its cutting edge positioned at the proper angle upon the file which con stitutes a part of the device and across which the blade is drawn.

It is a further aim of the invention to provide guides against which the blades of a pair of scissors are to be disposed when sharpening the blades, the guides being so positioned as to hold the scissor blades at such an angle as to properly bevel the1r cutting edges.

F or a full understanding of the invention reference is to be had to the following description and accompanying drawing, in which Figure 1 is a perspective view of the sharpening device embodying the present invention. Fig. 2 is a vertical transverse sectional view therethrough on the line 22 of Fig. 1 looking in the direction indicated by the arrow. Fig. 3 is a similar View on the line 33 of Fig. 1.

Corresponding and like parts are referred to in the following description and indicated in all the views of the accompanying drawing by the same reference characters.

In the drawing, the device is illustrated as including a supporting body which is indicated by the numeral 1 and is substantially I-shaped in cross-section, it being provided at its upper side with laterally projecting flanges 2. At one end the body is formed with an arm which projects downwardly as at 3 and beneath the body in spaced relation thereto, as at 4. A c1amping screw 5 is threaded through the portion A of the arm and is adapted to bear against the under side of a table, or like support upon which the base of the body 1 is disposed. The upper side of the body 1 is flat as clearly shown in Figs. 2 and 3 of the drawing, and upon the said surface of the body is disposed a flat file 6. The file is held in place upon the body 1 by means of a clamp, the body of which is indicated by the numeral 7 and is formed at opposite ends with depending arms 8 having inwardly projecting fingers 9 engaging beneath the flanges 2.

A plate 10 is disposed upon the surface of the file 6 beneath the body portion 7 of the clamping member and at its inner edge is formed with a flange 11 which projects upwardly at an angle, as illustrated in Fig. 1. By referring to the said figure it will be observed that not only is the flange inclined vertically, but that it extends diagonally across the face of the file 6 out of parallelism with the teeth of the file. A set-screw 12 is threaded through the body portion of the clamping member just described and bears at its end against the upper side of the plate 10, thereby not only holding this plate firmly clamped in position, but also serving to securely clamp the file in place upon the upper side of the body 1.

In addition to the guide plate 10 there is provided a guide which consists of a plate 13 formed at one edge with an upstanding flange or rest 14 and this plate is formed at its opposite edge with an upstanding flange 15 which is inclined as shown in Fig. 1. This guide plate is held in place by means of a clamp which consists of a body 16 formed with upstanding arms 17 located at its ends and having each of its arms provided at its upper end with an inwardly projecting finger 18. This clamp is applied by disposing the upper side of its body against the under side of the file 6 with the fingers 18 projecting over the plate 13. A clamp screw 19 is threaded through the body 16 of the clamp and may be tightened to bear against the under side of the file and cause the fingers 18 to bear firmly against the upper side of the plate 13.

It will be understood that the guide plate 13 is reversible so that either of its flanges 14: or 15 may be presented toward the middle of the file. The flange 14:, it will be readily noted, is higher than the flange 15 or the flange 11 and, consequently, provides a support especially adapted for the blade of a pair of scissors or shears. When it is desired to sharpen a knife by the use of our device, the guide plate 13 is arranged with the flange 15 between the two clamping members and the knife blade is placed fiat upon the file with its back resting againstas will be readily understood. If the blade be then reversed so that the face which was previously uppermost is brought into contact with the file and the back of the knife is then placed against the other guiding flange, the operation may be repeated so that the face which was previously uppermost will be minutely shaved in the same manner that the face first acted upon was shaved. The desired cutting edge will thus be quickly produced. It will be noted that the flanges form a rest for the back of the knife, and, as they are disposed at an angle to the set of the file teeth, movement of the knife blade while its edge is in contact with the guide flange will cause the blade to move across the teeth of the file and its face will be, consequently, very slightly cut away. Inasmuch as the back of the knife blade is always thicker than its cutting edge, the opposite faces of the blade will be acted upon in intersecting planes and the cutting edge will occupy the angle of intersection. A few strokes across the file will permit the cutting edge to enter fully into and fill the said angle and the desired degree of sharpness will thus be attained. By disposing the guide flanges at-an angle to a vertical plane, the desired bevel upon the edge of a scissors blade will be produced, inasmuch as one face of theblade will be held against the face of the flange with the beveled edge of the blade in contact with the teeth of the file, and, as the blade is drawn across the file, sufficient pressure will be placed thereon to hold it in contact with both the file and the guide flange.

It will be noted that the clamping members are identical in construction but that the clamping member 17 has its inwardly extending fingers or lips disposed above the file, while the other clamping member has its lips or fingers below the file and the supporting body. By reason of this identity of construction, either clamping member may be used at either end of the supporting body and the clamping member at the outer end of the supporting body may be so disposed that the set-screw carried thereby will be below the file and the support and, therefore, out of the way of the-person using the device. The construction permits the file to be readily adjusted so that a convenient portion of the working face thereof may be exposed or the inner clamping members may be adjusted longitudinally of the supporting body.

It will be readily understood that if a narrow blade is being sharpened, less space will be required between the guide flanges to accommodate the same than if a relatively larger blade was being sharpened, and, if the same space was maintained between the two guide flanges for-both blades, it would be necessary to move the narrower blade through an unnecessarily long path in shifting it from one flange to the other, but by moving the flanges before the sharpening operation is commenced the shifting movement of the blade may be properly reduced and the liability of theblade being nicked by contact with some part of the device or cutting the fingers ofthe operator through excessive movement will be reduced. It will also be noted that the guide plates are independent of'each other and should one plate become broken or bent through long continued use so as to lose its utility a new guide plate may be substituted for the samewithout requiringa new set of guide plates. The plates may be independently adjusted relative to the file according to the desires or convenience of any individual user.

Having thus described the invention what is claimed as new is A device for the-purposes set forth comprising a supporting body having a flat top, a file resting upon-the-said flat top, a guide plate rest-ing upon the file and having an upstanding flange disposed at an angle to the teeth of-the file, a clamping member fitted around the supporting body, the file and the guide plate, and means mounted in said member to secure the file to the sup port and the guide plate to the file.

In testimony whereof we affix our signatures in presence of two witnesses.

WILLIAM P. GRAY. JAMES H. DUNCAN.

[L. s.] [n s.]

copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents, Washington, 11.0.

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