US2111667A - Razor hone - Google Patents

Description

March 22, 1938. J, KOLL ER 2,111,667

RAZOR HONE Filed Feb. 23, 1937 -41 m i4 4 27 i4 is 2; 31

Patented Mar. 22, 1938 RAZOR HON E William J. Keller, Olean, N. Y., assignor to Union Cutlery 00., Inc., Olean, N. Y., a corporation of New York Application February 23, 1937, Serial No. 127,245

2 Claims. (Cl. 51-4211) My invention relates to improvements in hones or whetstones for use particularly in sharpening so-called straight razors although it is adapted for sharpening safety razorand other blades as will presently appear. 1

As is well-known, it is practically impossible to draw the cutting edge of a razor blade flat across the usual fiat stone or hone because, on the one hand, of variations in the cutting edge of the blade, for instance high and low spots, and, on the other hand, because of variations in the edge contours of the back of such blades due either to the style of the blade or to wear of the back edges of the blade from honing or sharpening operations.

With the foregoing in mind, it is the primary purpose of my invention to provide a sharpening stone, or hone, having a sharpening surface over which a razor, or other blade may be easily moved with a sweeping stroke flat against said surface and with perfect uniform contact between the cutting edge of the blade and said surface throughout the entire length of the blade and regardless of the irregularities in either the edge of the blade or in the edge contour of the back of the blade.

To the accomplishment of the above, my invention comprises a block of abrasive material having a concavo-convex upper face forming a segmental sharpening zone extended inwardly from one edge of the block from end to end thereof and merging at its rear into a concave-convex ridge curving inwardly from said edge in a long sweeping arc, the sharpening zone being formed transversely in different convex curvatures such that the cutting edge of a blade moved along said zone in a, sweeping curve and with a draw stroke substantially radial to said ridge may be always moved flat against a sharpening surface.

The accompanying drawing illustrates a preferred embodiment of my invention as set forth in greater detail in the following description and defined in the claims appended hereto.

In said drawing:

Figure 1 is a view in top plan of a stone or hone constructed according to my invention.

Figure 2 is an end View of one end of the stone.

Figure 3 is a similar view of the other end of the stone.

Figure 4 is a view in transverse section taken on the line 4-4 of Figure 1 looking in the direction indicated by the arrows.

Figure 5 is a similar view taken on the line 5--5 of Figure 1,

Figure 6 is another similar view taken on the line 6-45, and

Figure '7 is a view in front elevation.

Referring to the drawing by numerals, the hone of my invention comprises a block l of stone or. other abrasive material, such as carborundum, of substantially rectangular form and having 5 straight front and rear sides 2 and 3, respectively, straight ends 4, a flat lower face 5, and an upper face 6. The upper face 6 of the block is longitudinally concave from end to end of said block, as indicated at 'l and convex transversely as indi- 10 cated at 8. The transverse contour of the upper face 6 is formed in different curvatures throughout different zones of said face, as indicated in Figures 2' to 6, said curvatures varying uniformly from opposite ends of the stone inwardly thereof 15 to form a segmental sharpening zone 9 extending from end to end of the stone inwardly of the front side 2 and merging at its rear into a transversely convex ridge Ill curving from said side 2 in a long sweeping arc The transverse curvatures 2 of the face 1 may be in the form of irregular curves, as shown in Figures 2 to 6, properly graduated to provide the longitudinal concavity and the described ridge l3 and said curvatures may be the same or different as desired the important 25 desideratum being that they form the longitudinally concave and transversely convex segmental sharpening zone 9, and the similarly shaped ridge l0 described.

In the use of my improved stone or hone a razor 30 blade, indicated at l l in dotted lines, is positioned flat upon one end of the zone substantially radially of the ridge it and moved along said zone 9 in a sweeping curve and with a draw stroke substantially radial to the ridge H3. At the other end 35 of the zone 9 the razor blade is reversed on its back edge in the usual manner and the foregoing operation repeated. In any position of the'blade II on the zone 9 the cutting edge of the blade may engage flat against a sharpening portion of the 40 zone 9 and likewise in any position of the blade the same may be rolled or rocked transversely of the zone 9 if such action is deemed necessary to obtaining a proper edge on the blade.

Astone or hone constructed as above described 45 is economical to manufacture, adapted to withstand long use, provides a surface over which a razor blade may be easily manipulated particularly by a novice, and is otherwise thoroughly efficient for the purposes for which it was de- 50 signed.

Manifestly, the details described in the foregoing may be varied without departing from the inventive concept disclosed and right is herein reserved to modifications in such details falling 55 within the scope of the claims appended hereto.

What I claim is:

1. A razor hone comprising a substantially rectangular block of abrasive material having front and rear sides, two ends and an upper face, said upper face being concave from end to end of said block and transversely convex, the transverse contour being of different curvatures throughout different zones of said face, said curvatures varying uniformly from opposite ends of the block inwardly thereof to provide a segmental sharpening zone extending from end to end of the block inwardly of the front side and merging at its rear into a transversely convex ridge curving from the front side in a long sweeping arc.

2. A razor hone comprising a substantially rectangular block of abrasive material having front and rear sides, two ends and an upper face, said upper face being concave from end to end of said block and transversely convex, the transverse contour being of different curvatures throughout difierent zones of said face, said curvatures varying uniformly from opposite ends of the block inwardly thereof to provide a segmental sharpening zone extending from end to end of the block inwardly of the front side and merging at its rear into a transversely convex ridge curving from the front side in a long sweeping are, said ridge constituting means upon which the blade may be rocked transversely of the sharpening zone.

WILLIAM J. KOLLER.

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