US1895763A - Safety razor blade - Google Patents

Description

Jan. 31, 1933. A. LUBBERTSMEIER SAFETY RAZOR BLADE Filed Dec. 21, 93

Patented Jan. 31, 1933 UNITED STATES .ADOLF L'BBERTSMEIER, BABMEN, GERMANY SAFETY RAZQR nnnni Application filed December 21, 1931,'Serial n. 82,-,^35, a in Germany J'1y 2, 1930.

Razor blades are clamped for use in a safety razor. By tightening up an abutment to a greater or less extent by means of the handle of the razor, the blade is pressed 5 more or less firmly against the comb or guard of the razor. Under these circumstances the cutting edges of the blade are at a greater or less distance from the comb according to the degree of bending of the bladej If the` abutment is firmly tightened up, the cutting edges bear comparatively closely on the guard. In such a case shaving is particularly safe, since the blade is firmly clamped in the razor, and the user will not -cut himself.

There is however the disadvantage that the blade does not catch particularly well. If on the other hand the abutment is moved away from the guard, the cuttingedges of the blade rise off the guard in consequence of theelastic properties of the blade. In this case the blade catches particularly well.

There is however the disadvantage that the blade is liable to cut into the skin, since it vibrates during the shaving.

The blades are moreover in the course of manufacture stamped out of a long steel strip, or broken after the hardening of this strip at a so-callecl breaking mark. Since .the steel strip is produced by rolling, the fibres of the metal eXtend in the longitudinal direction theren, and therefore in the blades made therefrom, and the stiffness of the blade in the transverse direction small. i

These disadvantages are obviated by the razor blade according to the present invention, a blade being provided which can be rmly clamped between the parts of the razor, and in which the cutting edge is far 0 enough away from the guard comb to enable the individual hairs to be reliably seized. The razor blade according to the invention is moreover particularly well stifiened in the transverse direction, so that even in the event is comparatively of it not bearing completely upon the comb,

it 'is not so liable to vibrate and therefore to cut into the skin. c

i The invention is diagrammatically illustrated by way of example in the accompanying drawing, in which igure 1 'is a view of a razor blade ac-- cording to the invention, i v

Figure 2 is a section on the line I'l II in Fig: 1 ,1on a greatly'enlarged scale :Figure 3 is a view of another for'nri'ofcon structicn ofthe razor bladeaccording to the invention and I e e Figure 4. is a' section on the line n 7 r ll Ac ording to th e invention the *blade b ened' by halnmering or pressing a Way 'that projecting elements a are produced.

At c is 'indicated how the projections are s'e arated from one' another clear boundary' lines. *Such 'a blade is immediatelyready i for use in shaving and hasthe advantage hereinbefore indicated that the blade 'can be' firmly clamped between the parts of the razor; but .nevertheless cuts satisfactorily; and` no vibrations of the blade takeplac'e. 7 i

' Ina furtherpart'ouljarly ;a dvanta ge'ous invention is more resistant, it is possible to manufacture it i from. a cheaper material, which otherwise could not be employed at all ;for the manufacture of razor blades of such a high quality. In this way it is possible to reduce. the price of a razor blade. A further advantageresi-des in the fact that the hardness can be increased, by a lower starting temperature for example, without running any risk of the blade breaking. Owing to the greater hardness however, a 'better cut ting power and a longer cutting'life of the blade are obtained, or in other words an' improvement in the cutting properties ofthe blade. i

The invention is of course not restricted to blades with fastening holes of the kind illustrated but can also be employed with par- 1. A safety razor blade ticular advantage in the case of those socalled long-hole blades, in which either the fastening holes are connected by means of a slot occupying the entire central portion, or in which, instead of the fastening holes, a

'slot extending over the central portion of the blade is provided, or in which this slot eX- tends even'beyond the region ofthe outer fastening holes. In such blades with an elongated hole the space e of' the blade, located between the outer ends of the slot and the end edge d, is also preferably provided with such pressed or hammered elements, for-the' purpose of yielding goo-d transverse stiflness of the blade just in the comparativelynarrow portion of the blade by which the halves of the blade are held together. V r

What I claim is arranged small depression areas coverngthe surface adjacentthe cuttng' edge, said depression areas 'orming separate and. independent'raised boundary-edges extending ini wardly from the cutting edge 2.?A safety razor blade havng uniforinly r arrangedsmall depression areas coverng .the

surface of theblade and `forming a repeated pattern, adj acent depression areas being sepa-` rated byfindependent and 'clear boundary lines extending nwardly of the cuttin edge.

3. A .safety razor blade having uni ormly arranged small depressions on the surface of the- .b1a-de, the depressions being separated from one another by clear boundary lines being flattened to form,

said boundary lines a flattened surface( v In testimony `whereofi `I aflix` my signature;

. ADOLF LUBBERTSMEIER.

having uniforrnly

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