US2637905A - Bias safety razor blade - Google Patents

Description

May 12, 1953 R. o. WILLIAMS ET AL BIAS SAFETY RAZOR BLADE Filed April 24, 1952 Patented May 12, 1953 BIAS SAFETY RAZOR BLADE Robert Owen Williams and Owen Eugene Williams, Jackson Heights, N. l.; said Owen Eugene Williams assignor Vto Elizabeth Gertrude Williams,Jackson Heights, N. Y.

Application April 24, 1952, Serial No. 284,096

a special safety razor blade that has its cutting edge disposed at an eflicient cutting angle so that it has a slicing action in use.

An ancillary object is to have such a razor blade that has its intermediate slot by which it is held in a handle disposed at a small angle with respect to the cutting edge or edges of the blade.

An important object of the invention is to Dl'O- duce the novel razor blade by conventional methods with conventional machinery in as simple and cheap manner as ordinary razor blades without any additional cost.

A particular object of our invention is to have a safety razor blade made with its intermediate retaining slot disposed at a critical small angle with respect to the cutting edge thereof so that advantage is taken of the fact that at such a small angle the slicing effect of the blade is obtained at an especially high efficiency and with a minimum of mere plowing or planing effect.

It is, of course, a practical object to have a razor blade of the character indicated that will t on conventional razors of the safety type without the necessity for any change in construction.

Other objects and advantages of our invention will appear in further detail as the speciiication proceeds.

In order to facilitate ready comprehension of this invention for a proper appreciation of the salient features thereof, the invention is illustrated on the accompanying drawing forming part hereof, and in which:

Figure 1 is a plan view of a safety razor blade made according to our invention and embodying the same in a practical form;

Figure 2 is an end view of the same razor blade as seen from the right in Figure 1;

Figure 3 is an exploded view of a typical safety razor with the razor blade of the invention ncluded, the parts being shown in individual Der spective; and

Figure 4 is a view illustrating use of the razor equipped with the blade embodying the present invention of Figures l to 3, the razor being shown in a position about to leave the face after having finished the shaving stroke.

Throughout the views, the same reference numerals indicate the same or like parts.

Safety razors of the type having replaceable 1 Claim. (Cl. Sli-351) blades are, of course in common use, and the hoe type razor appears to be rather more popular than other types. Such a razor uses a blade having two cutting edges, with an intermediate elongated slot which fits upon a corresponding projection upon the razor handle beneath the cap. However, such a razor in use actually planes or plows the hairs of the `beard olf, while it is desirable to slice the hairs, instead, as lthis will be most effective to cut the beard smoothly.

Upon considering lthis problem, it has occurred to us that a razor blade should be disposed at a denite bias with respect to the path of travel thereof when cutting a beard while using a more or less conventional razor of the type referred to, and without special thought or adjustment. As a result, we have succeeded in producing a special bias razor blade as already outlined, which we shall now proceed to describe in detail in the following.

Hence, in practice of our invention, and referring also again to the drawing, a razor of the popular type indicated at 5, includes the guard member 6 having series of guard teeth 1, 'I along both sides and an intermediate groove 8, as well as a central hole d for a threaded stud Ill of cap member il. This cap is also provided with two elongated locating lugs I2, I2 disposed in line and adapted to enter the intermediate slot I3 of the razor blade Ill, the latter having the two mutually parallel shaving edges I5, I5. The razor is normally retained in assembled condition when the handle I6 is engaged with the threaded stud It) on cap Il, with blade I4 and guard G therebetween.

However, in order to include the features of the invention, the intermediate slot I3 of the blade Ill is not actually aligned with the longitudinal axis of the blade in conventional manner. but is slightly rotated about the central stud opening I'I to be substantially iive thousandths of an inch out of parallel with the axis I8 at the end of the blade or slot as indicated at IB. This low inclined angle is quite eective to irnpart to the edges I5 of the blade the correct slicing character to alter the effect of the blade from a planing and plowing action to actual effective slicing action during shaving. The inclination of the longitudinal axis of the Slot I3 is rather critical, as less than .005 inch is ineffective, and more than this angle defeats the purpose by being too great an inclination for the best effect.

It is obvious that it is no great problem to slightly alter the stamping mechanism when producing the blades from that used for ordinary razor blades, because the actual difference in manfacture is one of change in the position of the intermediate slot, and not the dimensions of the blade or of the slot. The blade Will therefore be as reasonable in cost as conventional blades with the advantage of the invention incorporated.

In order to cooperate with the inclined slot the notches 2li-Eil on theblade are out deeper into the ends thereof than the other notches itl-2|, so that the rst mentioned notches will allow projections 22-22 of guard il to definitely dispose the blade in the slightly rotated or inclined position already described in connection with slot i3 and lugs i2-12. The position 'of blade it is thus very definitely ensured 'so that the inclination of edges l5-l5 will be certain in use.

Contributing to the proper t o the blade the razor, and especially with respect to the four lugs 22, 22, etc. on the cap member Il, the entire profile 29, 2i, 23 and 24 at each vcorner of the blade is out ont to a greater extent than upon a conventional razor blade of similar type. In `fact, twenty-five thousandths of an inch Will serve as the excess which I prefer to cut from the conventional cut-out portion at each corner.

Manifestly, variations may be resorted to, and parts and features may be modied or used without others within the Yscope of the appended claim.

Having now fully described our invention, we claim:

A razor blade for use with a razor having a cap provided with a stud centrally thereof, elongated blade aligning lugs adjacent said stud and extending along the longitudinal axis of said cap and blade aligning lugs adjacent the corners thereof, said razor blade having at least one shaving edge and having an elongated slot receiving the stud and elongated lug means on the cap, said slot being positioned slightly from the longitudinal axis of the blade so as to be disposed at an angle at each end of the blade spaced substantially five thousandths of an inch from the longitudinal axis of said blade, said blade having end [notches 'therein for receiving the corner lug means of the cap with two diagonally opposite notches being cut into the ends thereof a greater distance inward than the correspondingly op-v posite notches on said blade.

ROBERT OWEN WILLIAMS. OWEN EUGENE WILLIAMS.

References Cited .in the le of this patent UNITED STATES PATENTS Number Name Date 1,858,316 y Thompson et al. May 17, 1932 2,251,008 Thompson July 29, 1941 FOREIGN PATENTS Number Country Date 299,697 Great Britain May 21, 1928

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