US2119405A - Safety razor - Google Patents

Description

y 1938. w. o. RUNCIE 2,119,405

SAFETY RAZOR Filed Oct. 21, 1956 INVENTOR BY I 1mm 1 M ATTORNEY Patented May 31, 1938 UNlTEDs A PATENT QFFECE' SAFE-TY RAZOR Walter Osborne Runcie, Lima, Peru tioned pilot pin type.

Application October 21, ,2 claims.

This invention relates to safety razors, and more especially, to the double-edged type of blade used in conjunction with that class of safety razor provided with'two oppositely disposed pilot pins in addition to the central binding screw which engages with the handle of the razor.

The object of my present invention, is to provide a simple, convenient and time-saving improvement in safety razors of the above men- This improvement is effected simply andinexpensively, by changing the angle of the usual parallel-sided pilot pin apertures of the blade, or, by otherwise providing angularly disposed slots in order to comply with the requirements of my invention. Compare Figures 1 and 2 of the drawing. The sizes of the triple apertures may remain substantially the same as those provided in the conventional double-edged blade. Furthermore, no changes whatsoever are necessary in the construction of the razor itself.

, From the manufacturers standpoint, the prob lem is extremely simple, he has merely to substitute in his punching machines, dies adapted to punch angularly slotted apertures conforming to the requirements of my invention.

When two blades of this improved type are correctly combined in a conventional razor of the class previously described, four cutting edges instead of two, will be at the disposal of the user. Changing from one pair to the other, may be instantly and automatically effected by unscrewing the handle of the razor a fraction of a turn, then by pushing endwise on the combined blades to their limit of movement, and again screwing up the handle tightly, the remaining pair of cutting edges will be in operative position.

The advantages of my invention will readily be appreciated, when it is considered that four cutting edges are instantly available to the user during the shaving operation; the disagreeable task of changing blades when necessary while shaving is also entirely avoided. It is hardly reasonable to expect uniformly highquality in every batch of fine steel employed in large quantities in the manufacture of safety razor blades, therefore, by having instantly available at will, four cutting edges instead of two, the shaving operation may be made more agreeable. A substantial saving in the cost of steel may readily be effected by using very thin stock. There are decided advantages in the use of very thin blades combined inpairs as called for in myinvention. Thin blades undoubtedly promote smooth shaving, and the combination in pairs imparts the necessary stiffness.

My invention consists in an improvement on the usual triple aperture type of double-edged safety razor blade, which is provided with a circular central aperture, and two modified cir- 1936, Serial No. 106,857 (CI. 30-50) stantially of the same size and shape as exist in the usual blade of this type, but their parallel sides are cut at an angle, or obliquely disposed.

The method of using blades of my invention consists in superimposing two such blades with their obliquely slotted apertures oppositely disposed to each other, and by clamping the combination firmly together. Before tightening up the handle of the razor however, both blades must be pushed to either extreme position, movement is limited by the pilot pins in both directions. 'New or used blades of this type may be combined, or they may be used singly if desirable, however, the combination adds considerably to the convenience and comfort of shaving.

For the purpose of. illustrating my invention, I have shown in the accompanying drawing, embodiments thereof which are at present preferred by me, since the same will be found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized, and that my present invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

Figure 1 represents a double-edged safety razor blade of the usual triple aperture type.

Figure 2 represents a blade similar to Figure 1, but with the parallel sides of the pilot pin apertures angularly or obliquely disposed, in accordance with the requirements of my invention.

Figure 3 represents two similar blades correctly superimposed and placed into position on the pilot pins of. the razor, with their angularly slotted apertures oppositely disposed to each other. This is accomplished simply, by reversing one of the blades. It is to be understood, that in manui'acture, allblades are slotted in the same angular direction. In this figure, both blades are seen in the extreme up position. The term up is merely relative, as the blades are represented in the drawing in a vertical position.

Figure 4 represents a similar condition as in Figure 3, but both blades are represented in the extreme down position.

Figure 5 represents in plan the curved clamp plate of a safety razor, with the usual pilot pins and central screw.

Figure 6 represents an end elevation of Figure 5.

Figure 7 represents in plan, the guard plate of a safety razor, showing the usual triple circular apertures.

Figure 8 represents an end elevation of Figure 7.

Figure 9 represents the complete assembly of a 7 safety razor incorporating the features of my ing cutting edges AI invention, and also represents a cross section through a portion of the handle.

Similar letters of. reference indicate corresponding parts.

Referring to the drawing:

In Figure 1 of the drawing, I have shown a representation of the usual triple aperture type of double-edged safety razor blade of conventional design; this figure is intended for comparison with the modification shown in Figure 2 which latter is my invention.

In Figure 2 I have shown a representation of a double-edged safety razor blade A provided with the usual circular central aperture F, which is necessarily somewhat larger in diameter than the base of central screw E of clamp plate Figures 5 and 6, topermit free movement of the blades while adjustments are being made. Two modified circular apertures C C of. substantially the same diameter as central aperture F, are provided with parallel edges cut to any pre-determined angle, say, from 25 to 45 degrees to the vertical plane of the blade. As will be seen in Figures 3 and 4, the object of the angularly, or obliquely slotted apertures Cl C2 co-acting with the pilot pins D D, are intended to provide the means for laterally moving the blades A and B, a distance of a fraction of a millimeter in either direction. Just suflicient relative movement is necessary in the adjustment of the blades A and B to avoid interference of the cutting edges with each other. It is desirable that very little clearance should exist between the parallel edges of the angularly slotted apertures Cl C2 and the pilot pins D D. This precaution is necessary in .order to insure parallel movement and proper alignment of blades -A and B.

The drawing has been purposely exaggerated in order to clearly illustrate the invention,

InFigureS is shown two blades A and BM my invention superimposed, and with slotted apertures arranged in correct relationship to each other, placed into-position on pins of clamp plate I of razor, Figures 5 and 6. Take note that the slotted apertures Cl C2 of blades A and B are .in opposite directions, and also, that blades A and B are in the extreme up position as indicated by arrow G in Figure 3. Pilot pins D D limit the movement of blades A and B in either direction. In Figure 3 it will be seen that cutting edges A2 of blade A, andBI of blade B are now in operative position, thanks to the cam action between the slotted apertures Cl C2 and pilot pins D D. In this position, cutting edges AI of blade A, and B2 of blade B, will now have receded from operative position. Guard plate J of razor with circular apertures LKL Figures '7 and 8 may now be placed into position, engaging pilot pins D D and central screw E of clamp plate I, Figures 5 and 6. Finally handle M of Figure 9 is engaged with central screw E of clamp plate I, and screwed up tightly to complete the assembly; see Figure 9. From the above description, it will be seen that opposite cutting edges A2'and Bl of their respective blades come into operative position at the same time. The same holds true for the remainand B2, when a blade change is effected.

To bring the other pair of cutting edges AI and B2 of blades A and B respectively into operative position, all that is necessary is to unscrew handle M of razor, a fraction of a turn in order to release the binding pressure of clamp plate I on blades A and B, then by pushing endwise on the blades in the direction shown by the arrow H in Figure 4, the blades will automatically assume their new position; the handle M of razor is now tightened to complete the change. Cutting edges vAl of blade A, and B2 of blade B will now be in operative position, while cutting edges A2 and BI will have receded into inoperative position.

It will now be obvious that my invention provides a quadruplex edged safety razor in place of the usual duplex. It is to be understood, however, that the blades of my invention may be used interchangeably with those of the usual kind, i. e. singly, without any inconvenience whatsoever.

It is also to be understood, that while I have described the simplest and least expensive means of putting my invention into practice, other forms of safety razor blades, including the single-edged variety, may be modified to function substantially in the same manner, in accordance with my invention. These modifications however, may necessitate changes in the design of the razors themselves, as well as in the blades, hence, I consider it unnecessary to describe them.

It is to be understood, however, that the principle involved, would naturally fall within the scope of my invention. I therefore claim any improvement involving said principle, in all makes and models of safety razor blades, to be used in conjunction with their respective razors.

It will now be apparent that I have devised a novel and useful construction of a safety razor which embodies the features of advantage enumerated as desirable in the statement of the invention, and the above description, and while I have, in the present instance, shown and described preferred embodiments thereof which will be found in practice to give satisfactory and reliable results, it is to be understood that the same are susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:-

1. In a quadruplex edged safety razor a body portion, a clamping plate, a clamping screw, a pair of blades between its body portion and clamping plate, each blade having a central opening, having a clearance with its clamping screw, and having pilot slots at opposite sides of said central opening extending obliquely from the median line of the blade, whereby relative longitudinal movement of the blades and body portion will selectively provide four cutting edges.

2. In a quadruplex edged safety razor, a body portion, a. clamping plate, a clamping screw, two superimposed blades of the same construction, each having obliquely disposed pilot pin slots, said blades when assembled between the body portion and clamping plate having their slots oppositely disposed to each other whereby relative longitudinal movement of a blade and body portion will selectively position in shaving position the edge of one blade and the opposite edge of the other blade.

WALTER OSBORNE RUNCIE.

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