US2556208A - Shaver - Google Patents

Description

F. P. MUSSO June 12, 195] SHAVER Filed April 16, 1949 -'atentecl June 12, 195 1 UNITED star;

gm OFFICE" 2 Claims.

This invention relates to a motorized shaver and has for its principal object the provision of a simple and inexpensive mechanical shaver which is cap-able of producing a fast, clean shave.

Further and other objects of this invention will become apparent as the disclosure proceeds and the description is read in conjunction with the accompanying drawings, in which Fig. 1 is a perspective view showing a preferred form of my invention;

Fig. 2 is a vertical cross-sectional View through the shaver head with a fragmentary portion shown in elevation; and

Fig. 3 is a plan view of the shaver blade.

It is well-known that when using a conventional safety razor of the type in which a thin razor blade is held within a guard holder and moved over the face, a smoother and easier shave is obtained when the blade is moved at a slight angle across the face rather than directly down across the face. This is because the edge of a razor blade, even though keenly sharpened, nevertheless has microscopic serrations along the cutting edge so that when the blade is moved with a sidewise Component, the blade actually acts as a saw in cutting the individual beard hairs.

The same principle is applied, but to a much greater extent, in the motorized shaver of my invention which comprises a suitably housed motor m having a rotatable shaft I l which supports a rotating blade holder, generally designated l2. The blade holder comprises an inverted coneshaped head !3, preferably of light gauge metal, which telescopes over the shaft i l and is piimed or otherwise Secured thereto as shown at I 4. The head l 3 is preferably formed with a threaded portion l5 which joins with an inwardly tapering platform 16.

Resting upon the platform IE is a guard, enerally designated IT, preferably molded of plastic material and having a rim portion l8 which conforms to the inwardly tapering platform IB, and from which rises a smoothly curved facial guard !9. The guard member is preferably cut out as shown at to conserve on weight. i

The cutting blade 2! is made of high-grade, tempered steel, and is of frusto-conical form with its lower margin resting upon the rim s of the guard member l'l. The blade 2! has a fine cutting edge 22 which is spaced apart a suitable distance from the rounded guard IS for reasons hereinafter explained. The blade is held in place on the holder 12 by a plastic cap 23 having a threaded portion 24 which mates with the threaded portion !5 of the head l3. The upper 2 margin of the cap is formed to match the angle of the blade 2 I, so that as 'the cap is screwed home, the blade 2l and guard 19 are firmly secured on the head !3.

In use, the shaver is held more or less perpendicular to the face and is moved in a circulatory path over the face. The angle of the blade 2l and the shape and the spacing of the guard !9 are such that the action of the shaver in moving across the face is the same as in a conventional safety razor, with the exception that the rotating blade 21 continually serves to move across each heard hair in saw-like fashion to aid in severing the hair, and in addition, the shaver is in a position to perform its intended function no matter in which direction the shaver is moved across the face( This results in a clean, fast shave and is particularly useful with boards characterized by the hair lying with various orientation across the face.

The razor of this invention may be used either as a dry shaver or with the usual face preparation for wet shaving. The shaver may be easily cleaned by removing the cap 23, the blade 2 l, and the guard Il.

The speed of the motor may be selected according to design, but an ordinary motor speed of 1800 R. P. M. is satisfactory.

The blade 2 I, which is characterized by its internal cutting edge 22, may be replaced when dulled, or may be readily sharpened by rotating it against a suitable honing stone properly shaped to 'provide the desired cutting edge.

The invention may be variously embodied and modified, as for example, the blade holder l2 may be rotated about an axis slightly eccentric to the axis of the shaft ll so that the head will have, in addition to a rotary movement, a slight translatory movement. Also the internal cutting edge 22 need not be circular; it may be scalloped, or otherwise shaped, although in such forms sharpening of the cutting edge becomes a problem. Also it is possible to provide a stationary cylindrical guard, such as shown at 25, frictionally held on the casing ill and telescoped over the revolving head !2 to aiiord better protection to the user.

It should be noted that the action of my cutting blade differentiates from the many types of mechanized shavers which employ a shearing principle (i. e. grasping each hair between relatively moving shearing blades).

I claim:

1. A mot'orized shaver comprising a motor, a shaft rotated by said motor, a blade holder mounted on the shaft for rotary movement with 3 the shaft, a frusto-conical blade mounted on the holder and having a, circular internal cutting edge, and a guard projecting upwardly through the opening in the cutting blade which defines the internal cutting edge.

2. In a motorized shaver, the combination of a motor housing, a motor in the housing, a shaft rotated by the motor, a threaded head Secured to the shaft and having an external threaded portion, and an inwardly tapered platform along its upper margin, a guard member adapted to rest upon said blade, a cutting platform of frustoconical shape also supported on said platform, said cutting blade having its upper margin sharpened to provide a circular internal cutting edge, 15 2,369,821

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,973,631 Johnson Sept. 11, 1934 2,081,366 Muros May 25, 1937 Eclov Feb. 20, 1945

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