US2103753A - Shaving implement - Google Patents

Description

Dec. 28, 1937. J. MUROS SHAVING IMPLEMENT 'Filed April 29, 195e 2 Sheets-Sheet 1 big Dec.,28, 1937. MUROS 2,103,753

SHAVING IMPLEMENT Filed April 29, 1956 2 Sheets-Sheet 2 grat amarte snai/mc marmara .lloseph Muros',

Gillette Safety cor (Company,

cambridge.' .twas-s., assigner a Easton, Mass.,

a corporation of elaware Application April 29, 1936 Serial No. 76,999

d Clas.

This invention relates to dry shaving implements and comprises a device organized to eect the cutting operation by nipping action as distinguished from the shearing action heretofore found in implements of this general type.

In implements operating upon a shearing principle it is* necessary to interpose one of the shearing members between the face of the user and the point at which the hair is cut. However thin this member may be its presence renders close shaving difficult. On the other hand, the interposed shearing member acts to some extent as a gauge determining the minimum .length of stubble. In the implement of my invention teeth are provided which are shaped to cut with a nipping action in a coincidental line which may thus be located at or substantially at the plane of contact with the face of theuser. Forexample, the cutting teeth may be so shaped that the cutting edges lie substantially in the plane of their contact faces. In an implement with teeth of this character there is nothing whatever to gauge the length of stubble remaining uncut, but the teeth are guided so that they meet at the surface of the skin and so pass lightly and without interruption over the face of the user without scraping or pulling. The resulting dry shave is, therefore, quicker and cleaner thanc that derived from the shaving implement operating on the shearing principle.

As herein shown each of two complementary members is provided with a series of spaced transversely extending teeth sharpened along their opposite top edges. The two members are assembled with their respective teeth alternately arrangedpand relatively movable from spaced relation in which hairs may enter freely between them, to nipping position in which the inter-- posed hairs-are either completely severed or so nearly as to break oil". It is a fact that a hair notchedon opposite sides to substantial depth will break off cleanly and that itis unnecessary that the nipper edges should actually meety in the hair.

Important features of the invention reside in the shape of the teeth which, as herein shown, are elongatedtransversely so that they each carry two cutting edges of substantial length, and are rounded at their ends so that they serve todirect the hairs into cutting position as the implement is moved transversely vover the face. Preferably the teeth are also shaped so that 'they tendto lift the hairs into upright position as the latter pass between them.

The invention also includes as an important feature a novel two-way connection by which the movable member may be moved yleldingly in both directions of movement.

'Ihese and other features of the invention will be best understood and appreciated from the following description of a preferred embodiment thereof, selected for purposes of illustration and shown in the accompanying drawings, in whichz n Fig. 1 is a plan View of the implement on an enlarged scale; ,A

Fig. 2 is a view in side elevation, the casing being shown as broken away; A Fig. 3 is a cross-sectional view the implement as is shown in Fig. 2i

Fig. 4 is a fragmentary view in perspective on a still larger scale;.

Fig. 5 is a view in perspective of the three principal parts of the implement shown in exploded relation Fig. 6 is a fragmentary view in cross-section showing a modified form of cutting tooth;

Fig. 'Z is a corresponding view in elevation of the modified implement;

Fig. 8 is a fragmentary View in elevation of the implement, illustrating another modified form of cutting tooth; and

Fig. 9 is a view in cross-section on an enlarged scale of the construction shown in Fig. 8.

The implement comprises an elongated casing iii which seryes also as a handle and from the upper end of which project the operating instrumentalities. is shown in Figs. 2 and thereof is housed a small' electric motor, not shown, which is connected through an operating lever Ii to the movable tooth-carrying member 'I1 which will be presently described. By these means the movable member is maintained in a state of rapid vibrationl while the implement is in use.

The stationary tooth-carrying member i3 com` prises an elongated block provided in its upper face with a series of spaced transversely disposed cutting teeth Il. Each of these teeth, as shown in Fig. 4, has a fiat upper face with rounded ends and is under-cut in such a manner as to form sharp lateral cutting edges at each transverse marginal edge. The flat faces of the teeth Il are designed to lie smoothly against the face of the user, while the rounded or tapered ends serve to deflect the hairs into the spaces between the teeth when the implement as a whole is moved transversely.v The member i3 is provided upon its inner face with an intermediate rectangular guide rib l5 and with a lower rectangular guide rib I6, the latter being interrupted by a centrallyl disposed opening.

The movable tooth-carrying member of the elongated block or slide implement comprises an I1 provided in its upper surface with a series of` of so much of, y

The upper end only of the casing 3 and within the body 4spaced transversely disposed teeth. i8 formedy similarly to the teeth i4 already described except that they are somewhat narrower.

teeth I8 are similarly fiat'faced and under-cut TheA to form lateral cutting edges at their opposite transverseedges and these edges are arrangedV in the same plane and coincidentally with the cutting edges of the teeth I4. When the two members `I3 and I1 are assembled the rib I5 is received Within a rectangular groove I9 provided for that purpose in the inner face of the slide member I1 and the lower face of this member engages the upper face of the rib I6, as shown in Fig. l3. In other words the two members arecomplemental in shape and the result of the interlocking engagement of the ribs and grooves is that the slide member I1 is guided for longitudinal movement with extreme accuracy in respect-to the stationary member I3. The outer face of the rib I5 bottoms in the groove I9 and the transverse relation of the two parts is determined in this manner. The upper faces of the two series of teeth may be brought accurately into a common plane by grinding the two tooth-carrying members in their assembled relation. edge with an opening 20 and through the opposite walls of this opening project the ends of a pair of spring plungers 2I. The upper end of'the operating lever II passes up through the central opening in the rib I6 and through the opening 20 in the lower edge of the slide member I1 and is provided with a rounded head which is engaged betweenfthe two opposed plungers 2|, as best shown in Fig. 2. This construction affords one convenient two-way'fconnection for imparting Vibration to the slide member I1 in a yielding manner in both directions of movement.

The two tooth-carrying members I3 and I1 are maintained permanently in an assembled relation by an elongated clamping member 23 having an upwardly tapering side wall shaped to bear against the outer side of the slide member I1, as shown in Fig. 3 and having elongated relieved areas to reducel friction between the two. The clamping member has at each end a transverse arm 24 between which the slide member I1 may move endwise with ample clearance and which are secured to the ends of the stationary member I3 by pins 25. The three parts abovedescribed are maintained in their assembled relation and are clamped in a socket formed in the upper end of the casing by a thumb screw I2 which is threaded through one wall of the casing and bears against the outer side of the clamp- .force one set of cutting edges into cutting relation and then acting through the other spring plunger 2i moves the slide to force the other set of cutting edges into operative relation. As shown in Fig. 2, for example, the operating lever II is acting upon the left-hand spring plunger 2i and has accordingly moved the slide member Il of its extreme left-hand position in which the left-hand cutting edge of each tooth l@ coincides with the right-hand cutting edge of` each Atooth M of the stationary member. As shown in Fig.

4 on the other hand, the slide I1 has been moved to the limit or its stroke in the opposite direc- The slide 'I1 yis provided in its lower tion. Whenthe slide member I1 occupies either extreme position the open spaces between adjacent cutting edges is approximately .008 inch. This has been found a satisfactory opening freely to receive the hairs to be cut and as already noted, the rounded ends of the teeth tend to direct the hairs into the space between the. teeth and their configuration is also such as to lift the hairs into uprightposition. It will be apparent that the implement may be moved in either direction across the face of the user and is equally ei'cient in either movement.

In Figs. 6 and 7 is illustrated modication of the invention in which the stationary teeth 54 are formed in an inverted U-shaped member 53 and the co-operating movable teeth- 58 are formed in a second inverted U-shaped member 59 arranged co-axially within the member 53 and secured to the slide 55. The principal difference between the modifications of Fig. 6 and those already described is that the teeth in the former modication are supported at both ends, whereas the teeth of the implement as originally described are supported at one end and resemble in cross-sectionan inverted L. In all cases', however, the co-operating cutting edges or faces are arranged coincidentally to act upon the hairs to cut them yol by a nipping action as distinguished from shearing. I

In Figs. 8 and 9 is suggested a modication in which the teeth 38 of .the movable member-31 are straight sided instead of being under-cut. In this case the hairs are nipped between the sharp transverse edges of the teethl I4 of the stationary member and vthe co-operating flat vertical face ofthe teeth 38 of the movable member.

In Fig. 8 the general contour of the cutting teeth is shown as being slightly convex instead of iiat as in Fig. 4 but in this case the curvature of both series of co-operating teeth is identical so that the teeth make a curved line-to-line contact throughout their width.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:-

1. A shaving implement havingv relatively movable tooth-carrying members each equipped with a series vof spaced teeth having their upper faces ground in a common plane, having rounded hair-directing ends and being shaped also to lift lhairs into upright position as they enter the space between adjacent teeth.

2. A shaving implement having a stationary tooth-carrying member, a movable tooth-carrying member having oppositely directed spring plungers therein, and an operating lever engaged upon opposite sides by said plungers.

3. A shaving implement having relatively movable tooth-carrying members each equipped with teeth having their outer faces ground to lie in a common curve, the teeth of said members being alternately arranged andshaped to make curved line contact at their cutting edges'.

4. A dry shaving implement comprising cooperating members, each having an elongated body portion with teeth projecting transversely from one side thereof and presenting oppositely directed nipping edges, said members being assembled side by side with the teeth of each member overhanging the body of the other, and means for relatively moving said members.

JOSEPH MUROS.

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