US2321932A - Hair cutting implement - Google Patents

Description

June 15, 1943- B. R. NYHAGEN HAIR CUTTING IMPLEMENT Filed July 21, 193B f ATTORNEYS Patented June 15, 12943 UNITED STATES PATENT OFFICE HAIR CUTTING IMPLEMENT Barney R. Nyhagen, New York,-N. Y. o Application July 21, 1938; Serial No. 220,419

3 Claims.

vskin so that the hair is causedto enter and protrude through the perforations and is held erect for severance by th'e rotatory blades thereby avoiding the bending over of the hair as occurs in the previous'devices d'ue to the fact that the (Cl. Sii-43) of the protruding portion I'l of the cutter. head shaft is iltted thereover and engaged against the shoulder i8 and said disk or washer is provided with-circumferentially spaced apertures 22'. A cylindrical sleeve 23 having a-central longitudinal bore 24 conforming to the cross sectional shape of the protruding portion I1 of the cutter head shaft is tted thereover and against the disk or washer 20. The cylindrical sleeve 23 is provided with circumferentially spaced longitudinally extending radially disposed grooves 25. An intermediate disk or washer 26 having a central opening 2l, corresponding to the cross secouter cutter element is caused to slide over the face. 1

The invention further resides in the improved features of construction and mode of assembly of the cooperative cutter elements which are'disclosed in the following specification, illustrated in the accompanying'drawing, and pointed out in the appended claims.

In the drawing:

Fig. 1 is a side view oi a hair cutting implement constructed in accordance with the invention, parts being broken away and shown in section to disclose the underlying structure.

Fig. 2 is an enlarged transverse sectional view therethrough taken approximately on the line 2 2 of Fig. l.

Fig. 3 is a collective perspective view ofthe cutter head, with the parts thereof in separated illxtaposition. y

Fig. 4 is 'a fragmentary longitudinal sectional view illustrating a modified form of drive the motor and cutter head shaft. j

Referring to the drawing by characters-of ence, A designates the handle of the device which houses a'motor il provided with a. drive Vshaft Il.

'. The cutter head, which is designatedgenerally 45` which is'journaled in a bearing boss Nin the handle A and which protrudes outwardlyfr'om by the reference character B, includes a shaft Il one end thereof. o

mally urged radially outward by a bowed leaf ,v

between tional lshape of the protruding portion of the shaft I1, is tted thereover against the upper end of the cylindrical sleeve 25 andthe same is formed with radial slits 28 corresponding to and registering with the grooves 25 of the cylindrical sleeve 23. The disk or washer 26 is provided with circumferentially spaced apertures 28d.

A second cylindrical sleeve 29 having a central bore 30 and radially disposed longitudinally extending grooves 3l is iltted over the protruding portion I1 of the cutter head Vshaft with the grooves 3| registering with the slits 28 and grooves 25 of the sleeve 23. An upper washer 3 2 having a central opening 33 and circumferentially spaced apertures 34 is fitted over the protruding portion i1 of the shaft'and against the upper'end of the sleeve 29. The upper terminal ofthe reduced portion I1 of the shaft is threaded at 3i and is adapted to receive thereover a clamping nut 36 to removably retain the cutter head elements in place. A radial blade' 31 is arranged in each aligned groove`2i, slit 28 and groove v3i of -the assembly and between the'lower and uppermost disks 23 and 32. The blades 26 are norspring Il.

The cutter head further includes a hollow cylindrical outer cutter element 40 which is of exf 1 tremely thin gage material formed with closely The protruding portion l1 of the cutter head' J shaft is of a reduced diameter defining at its juncture with the lower portion I5 thereof a shoulder il and said reduced portion of the shaft is formed with' a longitudinallyl extending ilat It. A disk or washer 2 0 having'a central opening 2l conforming to the cross Asectionalslmpe vperfcirations of the The cutter element 40 is of such a length that spaced minute perforations l i 'The inner periphery of outer cutter element lli is of slightly greater-diameter thn the diameter of the outer sks or washers 20, 2i and 32.

its opposite endportio ns protrude slightly beyond the lowermost and uppermost disks orv washers 20 and 32 and said velement has tted within the opposite ends thereof bya driven frlotlonalm, a pair of annular collars n and 43 so that the sleeve is mountedin surrounding relation to' the washers, shaftl and blades for l free rotationandwhereby the outer edges of the yIn lieu of the oscillating, rotatory motion however, the lower portion I5 of the cutter head shaft may be directly coupled by a suitable coupling 4 9 with the motor shaft Il so as to impart continuous rotation to the cutter head assembly as illustrated in Fig. 4 of the drawing.

In use and operation, the outer periphery of the cylindrical outer cutter element 4|)2 is rolled over the skin so that the hair is caused to protrude through the perforationsv4| thereof, while the blades 31 which are rapidly oscillated or rotated within the element 40 effect the severance of the hair which protrudes through the perforations. Obviously, this avoids the bending over bf the hair as occurs in previous dry shavers where the outerk perforated cutter element is caused to slide over the skin. In the present ldevice, the perforated cylindrical cutter element 40 by being rolled over the skin causes the hair which protrudes therethrough to be held erect for severance by the relatively movingv blades, thus obtaining a closer shave while avoiding irritation of the skin due to the elimination of friction which results from the sliding of an outer cutter element over the face which has been heretofore practiced. The apertures formed in the disks or washers 20, 26 and 32 permit the severed particles of hair to be blown out or otherlwise removed Vfrom the interior of the cutter ead.

What is claimed is:

1. In a dry shaver, a cutter head including a driven rotatory cutter element having radial blades, a hollow perforated cylindrical cutter element mounted in surrounding relation to and adapted for free turning movement with reference to the driven cutter element and for rolling engagement with the skin while the driven cutter element is being driven to turn independently of and with reference to said hollow cylindrical cutter element, and resilient means for urging the outer edges of the blades into intimate engagement with the inner periphery of the cylindrical cutter element.

2. In a dry shaver, a cutter head including a driven rotatory cutter element consisting of a. shaft, and a sleeve keyed thereto having radially disposed longitudinal grooves, blades mounted in said grooves for turning movement with said sleeve and shaft, a hollow perforated cylindrical cutter element, mounted in surrounding relation'to and adapted for free turning movement independently of and with reference to thev driven cutter element and for rolling engagement with the skin, and resilient means within said grooves for urging the outer edges of the blades into intimate for severance by the blade.

BARNEY R. NYHGEN.

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