US2837819A - Dry shaver with reciprocating circular bevelled blades - Google Patents

Description

June 10, 1958 K. BAUERLE DRY SHAVER WITH RECIPROCATING CIRCULAR BEVELLED BLADES Fig. 2

Filed Nov. 28, 1955 IIII I II Mam United States PatentC DRY SHAVER WITH RECIPROCATING CIRCULAR BEVELLED BLADES Kurt Bauerle, Wurttemberg, Germany Application November 28, 1955, Serial No. 549,475 Claims priority, application Germany November 27, 1954 3 Claims. (Cl. 30-42) The invention relates to a dry shaver wherein one or more cutting blades are made to execute rapid reciprocating movements relative to each other by electrical or mechanical means.

It relates principally to such shavers of the type having a shaver head wherein one cutting blade or set of blades is stationary while the associated blade or set of blades is movable.

The purpose of the invention is to provide a rapid cropping of the bristles at full length, and at the same time prevent injury to the skin.

The invention abandons the conventional method of causingthe cutting blades to execute a shearing motion in which the cutting blades slide along just below the opposing blades. This method is disadvantageous in that the bristles are at best cut off at a distance from the skin equal to the thickness of the top knife in contact with the skin.

According to the invention, the cutting blades are instead so arranged that their cutting edges, situated substantially outermost, lie in the same plane at least in the act of cutting, and are movable relative to each other after the fashion of a pair of nippers. In consequence of this movement, the cutting edges meet on the outside and clip ofi the bristles immediately above the skin. As a matter of fact, if the skin is stretched, it is possible to crop the bristles beneath the surface of the skin, such as in Wet shaving.

In the accompanying drawings, there is illustrated the device according to the invention, but it should be understood that this illustration is given by way of example and not of limitation, and that numerous modifications may be made without departing from the idea of the invention.

In these drawings:

Fig. 1 is a front elevational view, partly in crosssection of the shaver head according to the invention.

Fig. 2 is an enlarged detail, in cross section of a portion of the shaver head.

Fig. 3 is a partial plan view of the shaver head.

Referring now to the drawings in detail there is shown in Fig. l a shaver head 20 by the use of which a pincerlike cropping of the bristles is obtained by means of a rolling motion between stationary and movable cutting blades. Secured in the head 20 is an outer stationary shaver plate 22 provided with annular, preferably circular openings 23, in the interior of which there are adapted for rotation round eccentrically mounted blades 24. As may be seen in Fig; 2, the edges of the openings 23 are conically beveled and ground so as to form stationary knives. The circular blades 24 are fashioned in the form of bolt heads 25 conically beveled and ground, with their cutting edges in the same plane as those of the openings'23. The knife bolts 24, 25 move together, eccentrically. with respect to the openings 23, as shown in Fig. 3. For this purpose they are fixed in an inner movable plate element 26 (Fig. 1) to which the requisite rapid reciprocating movement is imparted by cushioned eccentrics in manner not shown, for example by electric motor means. Consequently, as is apparent from the drawings, at the cutting points of contact of the circular blades 24 with the sharp edges of the openings 23 these circular blades move along the latter, thus continually cutting ofl the bristles 27 between the edges. The maximum intervals 0 between the edges are such that the skin will not be pressed in and injured even if the shaver is firmly presented.

To make sure of entry and cutting of longer hairs, the outermost openings 23 are provided with cut-out portions 29. In this embodiment, the bristle receptacle comprises the space 30 between the bolt heads 25.

Within the scope of the invention, the elements de scribed may be structurally modified in numerous ways. Thus for example, instead of an electrical drive, there may be a mechanical drive, for example using a spring wound by hand. Alternatively again, a plurality of shaving heads as described may be arranged side by sideor one behind another, with or without staggered arrangement. The shaving heads may readily be made in curved shapes. The blades themselves may have arcuate or undulate edges. In the embodiment according to Figs. 1-3, the plurality of openings and knives may be replaced by a single opening with only one knife. Further, the openings and knives,-instead of being circular in shape, may be of some other rounded form, for example elliptical. In that case, the major axes of the ellipses may lie at any angle to the shaving motion. The rolling, or simple nipping motion between the stationary and movable blades may if desired be accompanied by a lateral translatory motion.

' What I claim is:

1. In a dry shaver of the type having cutting means movable relative to each other and provided with motive means for actuating said cutting means; a shaver head comprising a stationary cutting element and a movable cutter element; said stationary cutting element consisting of an outer stationary plate having a plurality of spaced circular openings therein, said circular openings formed with conically shaped cutting edges; said movable cutter element consisting of a plurality of eccentric circular blades rotatably mounted in said shaver head and movable ec'centrically with respect to said circular openings, said circular blades having cutting edges of the shape of bevelled pins, said cutting edges of said circular blades disposed in the plane of said conically-shaped cutting edges of the openings in said outer stationary plate; an inner movable plate element in said shaver head mounted for reciprocating movement, to which said circular blades are operatively connected, and eccentric drive means insaid shaver head for imparting reciprocating movement to said inner movable plate element.

2. In a dry shaver of the type having cutting means movable relative to each other and provided with motive means for actuating said cutting means; a shaver head comprising a stationary cutting element and a movable cutter element; said stationary cutting element consisting of an outer stationary plate having a plurality of spaced circular openings therein, said circular openings formed with conically shaped cutting edges, said outer stationary plate having. a plurality of cut out portions communicating with said circular openings, for allowing the entry of longer hair; said movable cutter element consisting of a plurality of eccentric circular blades rotatably mounted in said shaver head and movable eccentrically with respect to said circular openings, said circular blades having cut ting edges of the shape of bevelled pins, said cutting edges of said circular blades disposed in the plane of said conically-shaped cutting edges of the openings in said outer stationary plate; an inner movahle plate element in said shaver head mounted for reciprocating movement, to which said circular blades are operatively connected, and eccentric drive means in said shaver head forti mparting reciprocating movement to said inner movable plate element.

3. Dry shaver according to claim 1, comprising a plurality of rows of said eccentric cutting blades in staggered relationship. 9

References Cited in the file of this patent UNITED STATES PATENTS Wills July 18, 1933 Muros Dec. 28, 1937 Harding Mar. 5, 1940 Nordhem Mar. 13, 1951 FOREIGN PATENTS Austria Mar. 25, 1929

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