To all whom it may concern:

Be it known that I, Carl Schoenert, a citizen of the United States, and resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Safety-Razor Blades, of which the following is a specification.

The principal object of this invention is to provide a new and improved construction in a razor blade.

A further object is to provide a construction of a razor blade by means of which a sliding movement of the blade over the skin will cause a relative transverse movement of the skin and consequently of the hairs with respect to the blade.

For the accomplishment of these and such further objects as will hereinafter be apparent to those skilled in the art to which this appertains, the invention consists in the construction, combination and arrangement of parts herein specifically described and illustrated in the accompanying drawings, wherein is shown a preferred embodiment of the invention, but it is to be understood that changes, variations and modifications may be resorted to which fall within the scope of the claims hereunto appended.

In the drawings forming a portion of this specification:

Fig. 1 is a plan view of my invention as applied to a safety razor blade,

Fig. 2 is a section on the line 2—2 of Fig. 1.

Fig. 3 is a view looking towards the edge of the blade.

Fig. 4 is a perspective view of a blade partly broken away.

Fig. 5 is an enlarged diagrammatic showing of the effect produced by the improved blade upon the skin.

Figs. 6 and 7 are diagrammatic views illustrating the transverse movement, of the skin.

As shown in the drawings, 10 is a razor blade having adjacent the cutting edge 11, thereof, a series of depressions 12 extending a short distance inward from the cutting edge and perpendicular thereto, into the blade and forming a series of projecting ribs 13.

These ribs and projections may be provided on either one or both sides of the blade as will be readily understood.

It is well known that a proper cutting action can only be obtained when the cutting edge of the razor, knife or other instrument is moved transversely or slid across the object to be cut. When a razor blade provided with my invention is pressed against and drawn over the skin, the skin will move up wardly into the depressions between the ribs. This is illustrated in Fig. 5 in which the letter A indicates the skin showing it raised into a series of ridges indicated by the numeral 15. The line B C indicates the cutting edge of the blade and it will be obvious that as the blade is drawn along the skin it will be forced up into the depressions at a point a short distance behind the cutting edge. This will cause the skin to move transversely at these points which movement will necessarily cause a somewhat similar transverse movement at the cutting edge which is indicated by the arrows D, thus causing a relative sliding movement between the razor edge and the hair.

Fig. 6 illustrates graphically the transverse movement of the hair due to the projecting ribs and depressions.

The line B C indicates the cutting edge of the razor and F a hair. The arrow G indicates the direction of movement of the blade and the dotted line circle the relative movement of the hair as the razor is moved in the direction G.

In the triangle shown in Fig. 7, the line O P represents the movement of the blade, the line P R the movement of the hair and the line O R, the component of these movements; thus illustrating clearly the actual result obtained.

While I have illustrated my invention as embodied in a safety razor blade, it will be obvious that the same is not limited thereto but is applicable to any type of a razor blade.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States, is:—

1. A razor blade having a series of permanently fixed corrugations in such close proximity to the cutting edge as to cause a relative transverse movement between the skin and the cutting edge as the blade is drawn over the skin.

2. A razor blade having a series of projecting ribs with a series of depressions between said ribs, in such close proximity to the cutting edge as to cause the skin to move transversely into said depressions when the blade is drawn over the skin.

3. A razor blade having a series of projecting ribs with a series of depressions between said ribs, said ribs and depressions extending substantially transversely to and intersecting the bevels which define the cutting edge of the blade.

Signed at New York, in the county of New York and State of New York, this 8th day of March A. D. 1922.

Carl Schoenert.