US2213062A - Safety razor blade - Google Patents

Description

Aug. 27, 1940. A. BRANDENTHALER SAFETY RAZ OR BLADE Filed March 25, 1938 Patented Aug. 27, 1940 UNITED STATES PATENT OFFICE 1 Claim.

My invention relates to double edge safety razor blades as now used in the hoe type blade holders such as the Gillette type.

The object of my invention is to provide a blade of such nature that the same will perform in a more efficient manner than the present blades, now used, by producing a more rigid and positive true cutting edge.

My main object is to provide means whereby the cutting edges of my blade will be held in tension and thus become very rigid when said blade is locked in the holder and will thus remain until released in the holder.

The various types of standard double edge safety razor blades in use at the present time are stamped from flat thin metal stock and so designed as to be used in the standard hoe type safety razor holders. Due tothe thinness of this stock and to the fact that the taper on both sides 0 of the sharpened edges is exceedingly slight, the blade, for a substantial distance inward from the edges, provides but very scant support or foundation for holding the cutting edges in true alignment. Any slight obstruction encountered, such as a stub of hair, causes the thin edges to flex, waver, or bend back and thus fail in cutting through said obstruction as desired. These edges will, in a short period of time, attain what may be termed a rolled edge and when this occurs, the cutting edges do not function efficiently and the blades must either be sharpened or discarded more often.

My invention consists of a blade of normal cross-sectional curvature thruout the entire length thereof which when flattened in the holder produced such rigidity that said edges will remain in a true straight line and thereby sever the obstructions more effioiently. My blade will thus remain sharp for a much longer period of time than the present flat blades.

In the accompanying drawing, I have illustrated my blade with normal curvature and how the same is flattened abnormally when clamped in the holder:

Fig. 1 shows the end of a standard hoe type holder to which my blade is readily adapted;

Fig. 2 is an end View of my blade showing the same in its normal state, as positioned in the holder before being clamped by the members of the holder;

Fig. 3 is a section taken on line 3-3 of Fig. 1 to show how my blade is secured in the holder in exactly the same manner as the standard flat blades in present use;

Fig. 4 is a section taken on line 44 of Fig. 3 showing my blade as flattened in the holder;

Fig. 5 is a side View of the blade showing the same as flattened wherein increased rigidity is attained;

Fig. 6 is a similar view to Fig. 4 illustrating my blade as normal;

Fig. '7 is a side view thereof to'show how the edges are inclined in normal curvature;

Fig. 8 is an enlarged view of my blade as normal 5 and by broken lines, the straight lines attained by said edges when the blade is flattened;

Fig. 9 is an end view as normal to clearly show the elevation of the raised corners;

Fig. 10 shows the blade when flattened in the 10 holder;

Fig. 11 is a side elevation of Fig. 8 to show the blade as normal;

Fig. 12 is a side elevation showing the blade as flattened within the holder wherein the sharpened edges have become more rigid, forming true and positive cutting edges.

My blade as b is similar in thickness, size and design to the standard double edge blades now used in the hoe type safety razors, and is punched from thin, elastic, curved steel to attain the normal contour as illustrated. Said blade is to be secured in a standard holder such as c or any other similar type of holder. Such holder consists of a body 01 having guard preferably pro- 25 vided with teeth and a second member as to function as a clamping member. The member has a longitudinally convex inner face as ,f and the face of the holder d is correspondingly formed as at d so as to flatten and slightly curve my blade 30 When.- locked in the holder as seen in Fig. 2.

My blade is similarly provided with a longitudinal central slot g between the cutting edges hh' and is recessed as at i to accommodate for the shoulders 7' for the purpose of holding the 35 blade in place to be clamped by the members of the holder and also to hold the blade in position against any angular displacement. Both ends of the blade are unsharpened.

As seen in Figs. 8-9-11, my blade as normally formed is slightly curvedthrough the longitudinal center as In. Two of the opposite corners as l and Z lie normally on the curved line :r:c. One-half of the blade is increasingly curved in 45 cross section from the end Z toward the other end m, wherein the sharpened edge h rises at an angle from the end I in an arc to the end m.

The other side of the blade is also oppositely and increasingly curved whereby the edge h 50 is correspondingly inclined from the end Z to the end m.

When the blade is flattened in the holder and the cutting edges thereby straightened, a resistance to flexing cutting has been built up throughout the entire length of the edges of blade and held thus until released in the holder. Due to this condition, said cutting edges are sufficiently rigid to properly sever the hair more elficiently and at the same time remain true for a longer period of time than the edges of the present type of standard double edge flat blades.

I have thus provided a blade that is simple in construction and inexpensive in the cost of manufacture, and at the same time readily adapted to be mounted and efficiently operated in the present hoe type safety razor holder but superior to the fiat double edge safety razor blades now in use.

I claim:

A safety razor blade to be used in the present hoe type blade holder, formed from a thin metal strip, normally uniformly curved along its longitudinal axis and provided with a central longitudinal slot and two longitudinal cutting edges, one of these edges curved upwardly from one corner of the blade to a substantial height at the opposite end thereof and the other cutting edge similarly curved from the opposed corner of said blade wherein when the blade is clamped in said holder, said cutting edges will be flattened from said curvature.

ANTHONY BRANDENTHALER.

Images