US1941056A - Method and device for polishing two edged razor blades - Google Patents

Description

Dec. 26, 1933. F. ROHRBECK 1,941,056

METHOD AND DEVICE FOR POLISHING TWO-EDGED RAZOR BLADES Filed Dec. 11, 1930 Patented Dec. 26, 1933 I AND DEVICE Eon POLISHING TWO EDGED aazon BLADES METHOD Fritz Rohrbeck, St. Veit-on-the-Triesting,

Austria Application December 11, 1930, Serial No. 501,704, and in Austria January 14, 1930 2 Claims. (Cl. 51-212) This invention relates to a device for sharpening two-edged razor blades or the likeby means of some tool or body along which said razor blade is reciprocated in order to obtain keen 5 edges. The known means for sharpening razor blades generally consist in using some grinding body or means which may be flat, cylindrical or trough shaped, and along which the blade to be sharpened is moved.

The sharpening of the blade in such a case is obtained by an operation which may be termed grinding and which may be best described by stating that the irregularities of the cutting edges are removed by severing and splitting off fine particles of the material during such operae.

tion. I

Now it has been found that a particularly favorable sharpeningeffect can be obtained if the blade is moved over a brilliantly polished or highly burnished steel body which is troughshaped, as. a polishing agent; the blade is put on said polishing body in such a manner that both edges are resting upon. the side walls of the trough. L

direction all these slight The present invention is thus distinguished from the earlier art by thefact that a brilliantly polished steel surface isused, over which the blade is moved in a direction parallel to its cutting edges. Thus during this operation no splitting of. or severing of fine particles will occur and the operation, therefore, may no longer be termed a grinding operation@ The polishing effect is obviously due to other circumstances.

The cutting edge of each plate,-evenif made of the best material and if very perfectly ground, has still certain irregularities which, though small, impair the keenness of the edge; moreover, the grinding action itself will cause certain irregularities of the structure of the edge, especially receding-parts or indentations due to the breaking and: removing of crystalline particles. 'By moving the blade over the highly burnished or brilliantly polished steel trough in longitudinal irregularities are smoothed by pressing the protruding parts into the plane or surface of the cutting edge and no I indentations can be detected after the polishing operation according to this invention.

The new means of polishing allows to obtain the necessary degreeof' cutting properties in a very simple manner and with a remarkable rapidity; it is quite sufiici'ent to move ablad'e along the steel trough fora few times. The new device may be utilized not onlyfor sharpening worn blades, but may also be used with advantage the whole cutting edge the working surface may.

and that it is brilliantly polished or highly burnished. A suitable material for the working surface is formed by sufficiently tempered steel, such as the usual steel with carbon or chromium or even of softer, steels which have a chromium or chromium alloyed surface- The polishing surface-to be used according to my invention has preferably the form of a cylindrical surface with its axis arranged in parallel to the direction in which the working movement of the blade should take place. By these means simultaneous sharpening of both edges is obtained by merely moving the blade over the working a surface under slight pressure, the clearance angle between the working surface and the blade is thus automaticaly maintained during the whole opera- 'tion.

' In order to obtain a uniform treatment along be provided with rounded ribs running at an angle 7 to the direction of movement of the blade, whereby a reiterated contact of all points of the edges of the blade even if deformed with the polishing surface is secured. v

The invention is illustrated by way of example in the accompanying drawings in which Figs. 1, 2 and 3 are a longitudinal section, across-section and a plan of the device respectively while Fig.

4 is a longitudinal section through another modi Q fication of the invention.

As shown in Figs. 1, 2

and the working surface of the polishing body is formed by a trough;

shaped body 1 of brilliantly polished steel, preferably provided with a cylindrical surface. This body 1 is fastened to a block 2 of wood or other; suitable material by means of two bent ends 3 bent under a right angle which are entering into corresponding slots of said block.

,For sharpening'purposes the blade 4 which may 1 V j be secured to a suitable holder, is moved to and fro in the direction of the arrow :0. Y

According to Fig. 4 the polishing body 1 is provided with a plurality'of flat and rounded'ribs 1 running transversely to "the direction'of working ,9

movement of the blade and carefuly rounded over I which the blade may easily slide.

What I claim is:

. l. A device for sharpening two edged razor blades comprising troughshaped brilliantly polas g segment of a cylinder, said sheet being bent at its ends, a block carrying said sheet of steel, the said sheet being secured to said block by its bent ends entering in corresponding slots of said block.

FRITZ ROHRBECK.

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