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parts B' B D' D C A2 A' E' A E Fig1 Fig1 D3 D3 D' D D4 D3 D3 Fig2 Fig2 C' C C2 C' C2 C' C3 C2 C' C2 4-4 4-4 4-4 Fig3 Fig3 C2 C3 C C2 Fig4 Fig4 B' B2 B3 B' B2 B' B B2 B2 6-6 6-6 6-6 Fig5 Fig5 B C2 D3 D B' C Fig6 Fig6

Razor with Square Blade



FiledTuesday, 3rd October 1905

PublishedTuesday, 19th May 1908

InventorAdolph Kastor


CPC Classification:   
  • B26B21/18
    Safety razors with one or more blades arranged transversely to the handle involving blades with two cutting edges
  • B
    Performing Operations; Transporting
  • B26
    Hand Cutting Tools; Cutting; Severing
  • B26B
    Hand-Held Cutting Tools Not Otherwise Provided For
  • B26B21/00
    Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
  • B26B21/08
    Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor involving changeable blades
  • B26B21/14
    Safety razors with one or more blades arranged transversely to the handle

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A PDF version of the original patent can be found here.

United States Patent Office.

Adolph Kastor, of New York, N. Y. Razor.
No. 888,019. Specification of Letters Patent. Patented May 19, 1908.
Application filed October 3, 1905. Serial No. 281,132

To all whom it may concern:

Be it known that I, Adolph Kastor, a citizen of the United States, and a resident of the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Razors, of which the following is a specification.

My invention relates most particularly to safety razors and has for its object to provide such a razor with a blade having a plurality of cutting edges, that is more than two cutting edges, thus doing away with the necessity of frequent stropping, honing or sharpening, or the using of new blades.

My invention will be fully described hereinafter and the features of novelty will be pointed out in the appended claims.

Reference is to be had to the accompanying drawing in which

Figure 1 is a sectional view of my improved razor; Fig. 2 is an end view of the top plate; Fig. 3 is a face view of the blade; Fig. 4 is a sectional view thereof on line 4—4 of Fig. 3, Fig. 5 is a face view of the bottom plate and Fig. 6 is a vertical section through the top plate, the blade, and the bottom plate, on the plane indicated by the line 6—6 in Fig. 5.

A represents the handle which is provided with a central bore A′ having a reduced portion A2; a bottom plate B is secured to or forms part of this handle A, and as shown is provided at its four sides with teeth B′ which are so arranged as to serve as a guard to prevent the blade C, when in position, from cutting the person using the razor. This bottom plate B is further provided with four notches B2, the purpose of which will be more clearly brought out hereinafter. The blade C is provided with notches C′ corresponding to the notches B2 of the bottom plate B and is adapted to be secured in position by a top plate D in the manner to be more fully described hereinafter. The blade C as shown is square and has four cutting edges C2, although this is not absolutely necessary as the blade might be triangular in shape with three cutting edges or of a different shape with more than three cutting edges. The top plate D is secured to or forms part of a screw-threaded shank D′ which is adapted to extend through an opening C3 in the blade and through the reduced portion A2 and into the central bore A′ of the handle A. A nut E has a hollow screw-threaded shank E′ extending therefrom which shank E′ is adapted to engage the shank D′ of the top plate D and thus secure the parts in position, it being understood that the top plate is provided with projections D3 which extend through the notches C′ of the blade C and into the notches B2 of the lower plate B. The blade is thus prevented from rotating on its axis and is securely held in proper position.

While I have shown a razor blade with four cutting edges, I wish it distinctly understood that I do not limit myself to this construction as the said blade may be made for instance triangular in shape with three cutting edges or said blade may be provided with more than four cutting edges, and it is to be further understood that my claims are intended to cover such structures.

With my improved blade after one cutting-edge has become dull, another edge can be used, so that frequent honing or sharpening or even stropping is done away with.

It is to be understood that my blade may be used in connection with any suitable handle other than the one shown. It is to be further understood that although four notches have been shown in the blade and in the lower plate and four projections on the upper plate, this construction is not absolutely necessary as one or more notches in the blade and lower plate and one or more projections on the upper plate will answer the same purpose.

In order that all the edges of the blade C may be straight and in the same plane when clamped in the holder formed by the plates, B, D, the edges of these plates are straight, and in order notwithstanding, to give said blade the proper bending surfaces, the top plate D is provided with radial grooves D4, and the bottom plate B with radial ridges or raised portions B3, all running toward the corners. Thus the blade when clamped for use, will have four straight cutting edges and ridges running radially inward from the four corners.

Various modifications may be made without departing from the nature of my invention.

I claim and desire to secure by Letters Patent:

1. In a safety razor the combination of a polygonal blade the entire perimeter of which is sharpened, with a holder having two polygonal clamping members with portions arranged to engage the blade on opposite surfaces adjacent to the sharpened perimeter to hold each of the edges or sides thereof straight and to keep the entire perimeter in the same plane, said clamping members also having diagonal ridges and grooves respectively to flex the blade.

2. In a safety razor, a polygonal blade every edge of which is a cutting edge, and a holder comprising opposing members adapted to receive the blade between them, one of said members having grooves or depressions converging toward its center, and the other corresponding ridges or raised portions, extending inward from points corresponding to the portions of the blade's corners.

In testimony whereof, I hereunto subscribe my name in the presence of two sub scribing witnesses.

Adolph Kastor.


L. G. Osborne,

E. M. Netter.