US2282639A - Shaving implement - Google Patents

Description

May-12, 1942.. i BRUECKE 2,282,639

SHAVING IMPLEMENT Filed Nov. 1, 1939 MM w mm Maw 'azsasss I snavme John Bruce/her, Chicago, an. Application November 1, 1939, Serial No. 302,313 a Ciaims. (oi. tit-43) This invention relates to shaving implements of the type known as dry shavers. It has more particular reference to the cutting action between the skin-engaging member or comb and the cutter blade which is rapidly moved across the inner side of the comb.- It has further reference to that type of dry shaver employing an' extremely thin, curved comb and a cutter blade which oscillates at a high speed and is responsive to centrifugal force for urging it against the directly along the underside of the comb. Ac-

cording to my invention the cutter is so shaped as to avoid'or reduce initial bending of hair. This bending or distortion of the hair projecting through the comb would otherwise occur by reason of the body of the cutter striking and bending the individual hairs before the cutting edge en-= gages them in the cutting action. My improved construction tends to. avoid or reduce rhombic shape of the cut 011 pieces of hair and to produce sharp cutting and smoother shaving results.

Another object is to provide in a shaver of the character described a cutter having opposed cutting edges so shaped and positioned that a cutting action takes place in each direction of movement and the construction avoids entrapment of hair during the reverse stroke actions.

Referring to the drawing: Fig. l is a cross section through the cutting head of a dry shaver of the kind shown in my application for patent, Serial No. 178,221;

Fig. 2 is a longitudinal section through the cutting head taken substantially on the section line 2-2 of Fig. l, with some of the parts in elevation and omitting the drive element;

Fig. 3 is an enlarged fragmentary section through the comb and cutter; and

Fig, 4 is a similar section showing a modified form of cutter.

My improvements relate to the shape of the movable cutter member and its coaction with the stationary cutting member.

ing an extremely thin curved, S n-engaging member which is perforated or otherwise'formed to receive hairs to becut and is commonly known in this art as the comb," and a cutter blade which is moved at a high speed across the inner 2 side of the comb" and is so mounted as to be urged outwardly into cutting or shearing en'- gagement withthe inner. surface of the comb by centrifugal force.

In the example here shown for purpose of illustration,the comb designated generally by t is of extremely thin metal flexed 'or formed to acurved shape. In this instance the comb is flexed and is retained in such form by means of a skeleton frame designated generally by I having semi-circular members 8, 8, i0, ll, 12 g and i3 joined by longitudinal members it and it. The comb is provided with suitable per-' forations it to allow for passage ofthe beard hair .or other hair to the inner side and to provide cutting edges H at said inner side which j function in the cutting of such hairs. The perforations may be. of any suitable or preferred A comb of this type associated witha. skeleton frame so as to constitute aunitis claimed shape.

as subject matter of invention in my copending application above mentioned. my said applicationthe comb unit is supported on end walls is and It of a head structure designated generally by 20, and suitable means such as retaining elements 2| engage the comb unit and hold it seated on the head structure.

In' this example the cutter designated generally by 22 is carried by a holder 23 which in turn is provided with trunnion ends 24 journalled in the. end walls of the head structure. Suitable means are provided for rapidly oscillating the cutter holder consisting in'this instance of aneccentric pin 25v carried on a driving member 26 which rotates about an axis perpendicular to the axis about which the cutter holder oscillates and is driven by an electric motor or other suit-.

able source of power, the eccentric pin 25 being engaged between opposed parallel members 21 fixedly carried by the cutter holder at the side I of its axis opposite from the cutter proper. In

this instance, the cutter 22 is in the form of a flat blade having'a sliding fit in a slot 28 in a These improve- 'ments are applied in a shaver ofthe type hav 5 plane radial with respect to and intersecting the axis of the cutter holder. Also, a guide pin 29 on the blade is confined between opposed locating and guiding surfaces 80 so that the bladeis retained against lengthwise displacement with respect to the inner surface of the comb. This is desirable in the particularstructure' here disyclosed in order to maintain the cutting edges 0! As disclosed in.

the cutter blade in proper cooperative relation with the cutting edges on the comb, insofar as location lengthwise or. the comb is concerned.

a The blade is cut away at 3! to provide clearance cutter holder and-the cutter to urge the latter outwardly so that in this particular instance the cutter is influenced in this movement by both the spring force and the centrifugal force. According to my invention, however, either or both of these forces may be utilized. 4 My invention contemplates improved cuttin action between theskin-engamember t and I the cutter blade 22 characterized by the provision of acute angle cutting edges at opposite aasae'ac" avoids entrapmentof hair during the reverse stroke actions.

sides of the blade from end to end sov that the undercut wall intersects the outermost wall at w an acute angle. In the form shown in Fig. 3

the sides of the blade are hollow groundat 83 so. as to provide walls 34. in acute angle relation to the end wall'35 and'forming a sharp bladelike cutting edge 36 at the juncture of each wall 34 with the end wall 35., In the form shown in 4, the cutter blada is swaged, milled, or

' otherwise machined or formed at 31 to provide edge ll at the time the moving cutter first engages the hair. With my improvement the stress concentration at the cutting edge is materially In the dorm shown in Fig. 3, which is masnified approximately thirty diameters, the comb member is .002" in thickness; the openings l5 are .018" in diameter; the hole centers are spaced .045" apart; and the main body of the cutter is .022" in thickness and is reduced at the narrow portion by grinding to approximately .008". These dimensions are approximate as applied to this particular example. *It should be understood, however, that the invention is not to be circumscribed by limitation to such dimensions. It will be evident from the foregoing that changes may be made in the size, shape and proportion of the within the scope of the appending claims, in which- I claim:

1.. In a shaving implement, an extremely thin. curved, skineengaging member having hair receiving openings oi such area as to permit ready passage oi hair therethrough but'to confine the skin from passing beyond its inner surface, a cutter blade substantially normal to the inner surface of said member undercut at opposite sides to provide sharp acute angle cutting edges, and means for rapidly oscillating the blade across the inner side of said member with the blade urged against said inner side, whereby a relatively high unit shearing force is obtained in the cutting action of each cutting edge on an interposed hair and the moving cutter severe the hair close to the skin without tending to initially band that portion otthe hair which projects within the comb member, the opposed cutting edges being in such close proximity, one with respect to the other, as to avoid entrapment of hair between the terminalehd of the cutter blade and the skin-engaging member during the reverse stroke actions of the blade.

2. Shaving mechanism comprising a guard of thin sheet material adapted to have one of its increased and this high unit shearing force, to-

gether with the tendency to avoid bending of the inwardly projecting hair makes for closer and smoother shaving. It reduces the tendency to bend the inwardly projecting hair prior to or during the cutting action, thus reducing and,

to a degree, eliminating rhombic shape of the r cut of! pieces of hair. By severing the hair in sur faces pressed against the skin to be shaved, said guard being arcuately curved in atleast one dimension and being formed with numerous small circular perforations for admitting hairs, and a cuttermember for "engaging the opposite surface of said guard, means for supporting and angularly moving said cutter member over said latter surface, said cutter member comprising a.

sheet metal strip having an edge of substantial thickness bearing against said latter surface and said strip extending in a plane substantially normal to the various portions of said latter surface as same come into contact therewith, the sides of said strip being both formed with a groove of substantially arcuate cross section along said edge, one side of each of said grooves terminating at said edge and forming a relatively sharp acute angle with the surface comprising said edge.

- JOHN 'BRUECKER.

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