4 in 1 Razor With Four Edged Blade
Filed Saturday, 26th April 1919
Published Tuesday, 2nd December 1919
Owner 4 in 1 Safety Razor Company
Language EnglishCPC Classification:
Parts not referenced in the text: None
Parts not referenced in the images: None
To all whom it may concern:
Be it known that we, Charles H. Hyman and Joseph F. Moeller, both citizens of the United States, and residents of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Razors, of which the following is a specification.
This invention relates to improvements in razors and has reference principally to razors of the safety type, although certain novel features of the blade are applicable to both safety and plain razors.
Among the objects sought by the invention are, to provide a razor well adapted by reason of its structural features to effect a smooth shave of the hollow and otherwise irregular portions of the face, to provide, in a safety razor, an improved guard for the cutting edge or edges of the blade, to provide, in a safety razor, an improved back-plate or clamp presenting a minimum of interference with the surface of the face during shaving, to provide, in a safety razor, a construction which may be assembled, disassembled and cleaned with a minium
With these and other objects in view, which will hereinafter appear, our invention consists in the novel structure of blade and novel structures and combinations of coöperating parts hereinafter fully described, shown in the drawing and pointed out in the appended claims.
In its preferred embodiment our invention includes a razor blade having a plurality of cutting edges, preferably at least three, one of which is concave in the plane of the blade, another convex in the plane of the blade, and the third straight. In the accompanying drawings we have illustrated a safety razor having four cutting edges, but it will be understood that this number may be increased or decreased without involving any departure from the principle of the invention or sacrificing any of the advantages thereof.
Referring to the drawings—
Referring to the drawings,
The mode of use and advantages of the described construction will be readily apparent from the foregoing description and drawing. For shaving the hollow or concave portions of the face the convex cutting edge
The concave formation of the outer side of the back-plate
Furthermore, by bending the tips of the guard fingers over the edge of the blade, an increased factor of safety is secured, since it is absolutely impossible for the user to cut himself with this construction, whereas it is well known that the ordinary safety razor guard does not always prevent the user from cutting himself if the tool is carelessly or hastily used at an improper angle to the face. Our improved construction of guard may make it necessary to go over the same surface two or three times; but this is common practice with any razor.
1. In a safety razor, the combination of a polygonal back-plate having a materially concave outer side, a flat inner side, and a central polygonal boss on said flat side, said boss having a threaded stud on its free end, a flat polygonal razor blade having a central opening fitted to said boss, a flat guard plate having a central opening fitted to said boss, and a handle having at its inner end an enlarged cup-shaped formation with a central tapped hole at its base engaged with said stud, the enlarged inner end of said handle surrounding said polygonal boss and bearing against the outer side of said guard plate to clamp the latter and the blade against said back-plate.
2. In a safety razor, the combination of a back-plate having a materially concave outer side and a flat inner side provided with a central polygonal boss and a threaded stud continuous with said boss, a flat razor blade having oppositely disposed substantially parallel convexly and concavely curved cutting edges, straight cutting edges extending continuously between the corresponding ends of said curved cutting edges, and a central polygonal opening fitted to said boss, a flat guard plate having a central polygonal opening fitted to said boss, and a handle having a tapped hole engaged with said stud and operating to clamp said back-plate, blade and guard plate together.
Charles H. Hyman.
Joseph F. Moeller.