US2212117A - Razor - Google Patents

Description

Aug. 20, 1940. M. GRIVETTO ,11

RAZOR Filed March 12, 1936 Z Sheets-Sheet 1 UMMWM-W ATTURACZ'XS g- 20, 1940- I M. GRIVETTO 2,212,117

RZ-OR Filed Mairch 12, 1936 2 Sheets-Sheet 2 Fig. 7

By jab/ WM? 62W!) Patented Aug. 20, 1940 RAZOR Michele Grivetto, Turin, Italy, assignor to Societa.

Scientifica Radio Brevetti Ducati, Bologna,

Italy Application March 12; 1936, Serial No. 68,397

In Germany March 19, 192' 1 2 Claims. (01. 30-43)" Shearing devices for effecting a shaving cutso-called ,dry shavers-comprise generally a skin-contacting slotted shear. plate or stationary comb and a similarly slotted cutter or movable comb lying against the reverse face of the shear plate and reciprocated transversely, so that hair 15 It is the main object of this invention to-improve devices of this kind in such manner as to eliminate completely the danger of injury to the skin without prejudicing the cutting of the hair directly at its. root.

20 the movable comb forms an obtuse angle at the above mentioned edge of the stationary comb and the face of the movable comb extends directly over the skin surface as far as the protecting member, the protecting member serving the pur- 25 pose of stretching and holding the skin to prevent its being caught and consequently injured. The movable comb may also form an obtuse angle at the edge of the protecting member and graze the back of the protecting member with the 80 oblique surface thus formed. In this case, a form of the device is obtained in which the bottom, skin-contacting surfaces of the stationary comb, the movable comb and the protecting memher are substantially in'the same-plane so that 35 the cutting surface attains a zero value and the operates with that part of the front surface of the movable comb which extends upwardly at an obtuse angle to the skin-contacting plane, the 5 stationary comb extending as far as the apex of said obtuse angle.

The annexed'drawings show diagrammatically three forms of the razor according to this invention. 50 Figures 1 and 2 show the first form. Figure 1 is a longitudinal section of the complete razor.

Figure 2 shows on a larger scale a cross section of the cutting combs and a perspective view of the parts arranged behind the section plane. 55 Figures 3 to 8 show a second form. Fig. 3

According to this invention is a cross section of the razor head; Fig. 4 is a plan View of the stationary cutting comb; Fig. 5 is a bottom view of the movable cutting comb and Fig. 6 is a side view thereof. Figures '7 and 8 show two modified details. 5

Figures 9 and 10 show a third form. Fig. 9 is a cross section of the razor head; Fig. 10 is a partial plan thereof.

In an oval casing I (Fig. 1) is housed an electric motor 2, which imparts to a slide 4 through an 10 eccentric 3, a reciprocating movement in the di rection of the double arrow seen in Fig. 2, that is to sayperpendicularly to the plane of the drawing. The lower part of the slide 4 is slotted and constitutes the-movable cutting comb; the lower ends of its teeth 5 are of trapezoidal form. Said ends slide along their side surfaces So on the cor-. respondingly slanted surfaces 511 and la of two branches 8 of a lyre-shaped piece secured to the casing l. The lower endsof the branches 8 are slotted and form the teeth 6 and I constituting two stationary cutting combs.

The lower surfaces 5b and lb are preferably plane, at any rate smooth, so that they slide easily on the skin. Be-

tween the edges 60 and 10 formed by the intersection of the surfaces 6a and 5b and 1a, lb respectively, is provided a slot 9, in which slide the smaller base surfaces 5b of the trapezoidal teeth of the movable comb.

When the razor is passed over the skin with the movable comb 4, 5 oscillating continuously, the

hair which enters the slits between the teeth 5 and I, respectively, is out between the surfaces 5a. and 5a, la, respectively, and it is shortened several times, because the nearer the edge Go or 1c is brought to the hair, the nearer is the cutting point of the hair to the skin. Theoretically speaking, the cutting surface and the skin surface meet at the edges 5c and 10, so that practically the hair is shaved directly at its root;

The skin is in contact with-the movable comb 4 4, 5 only inside the slot 9. .On the two margins of said slot, surfaces 6b and 1b are provided which stretch the skin preventing wounds or scratches. It will be seen that only one branch of the piece 8 need be in the form of a cutting comb while the other'branch may be in the form of a solid piece serving to press down the skin; the razor would in such case be moved .only in one direction, all other advantages being maintained.

According to the form shown in Figures 3 to 8 the teeth 5 of themovable comb are hammershaped. Otherwise this form is similar to that shown in Figures 1 and 2. l

The teeth 5 of the movable comb shown in Figure 8 are provided with lower shallow grooves 575, this having-the advantage of substantially preventing any contact between the skin and movable cutting comb.

In order to prevent the teeth 5 from entering the spaces between the teeth 6 and I, the pitch of the teeth 5, in the example shown in Fig. 5, is not uniform over the whole length of the comb but varies from right to leftfrom a minimum to a maximum. Obviously the pitch might be increased from left to right and vary several times between a minimum and a maximum.

In view of the fact that the distance between the teeth 6 and 1 is a constant one, there is a sufficient support for the piece 4, 5 on the back So, Ia of the teeth 6 and 1.

In a modification the pitch of the teeth of the stationary comb may vary over the length of the comb.

According to the form shown in Figure 7, the teeth 5 of the movable comb are, as seen in plan view, inclined relatively to the teeth 6, 1 of the stationary comb. As shown in the drawings, the stationary teeth 8, I are arranged in a normal direction and the movable teeth 5 are deviated therefrom. This arrangement may be reversed or the teeth of both combs maybe deviated from the normal direction.

The angle of deviation may of course be narrower or wider than that illustrated in the drawings. It is also possible to combine the arrangements shown in Figures 5 and 7 that is to say to provide inclined teeth of variable pitch or make the teeth of a comb inclined and the teeth of the other comb with a variable pitch.

According to the form shown in Figures 9 and 10, the razor head is approximately of T-shaped section like ordinary safety razors. The plate I2 is secured to a support 10 by means of screws I I. Each of its longitudinal edges is in the form of a stationary cutting comb 6. The same support carries a plate l3 kept against rotation and longitudinal displacement; its longitudinal edges are indented and form a second stationary piece sliding on the skin. A plate 4 each of the longitudinal edges of which forms a. movable cutting comb 5 is arranged between the stationary plates l2 and I3 and performs a reciprocating movement in the direction of the double arrow, seen in Fig. 10.

The leaf springs I5 press the plate l3 against the plate 4 and consequently this latter against the plate 12. The skin is designated by dotted lines l6.

In this construction the back of the teeth of the stationarycomb 6 is also slanted transversally to the direction of oscillation of the movable comb to form an edge 60 which is grazed by the movable comb 5. The edge 6c lies also on the nearly plane surface 612 of the stationary comb 6 and the movable comb 5 extends beyond said edge 60 to the other piece 1, l3 sliding on the skin and is supported thereby.

What I claim is:

1. A razor, comprising in combination a motor, a lyre-shaped member, the branches of which form two spaced stationary cutting combs having surfaces slidable on the skin and extending at least nearly perpendicular to the axis of said lyre-shaped member, the back surfaces of said stationary cutting combs being inclined in opposite directions to form with the surfaces slidable on the skin, sharp edges lying in a longitudinal direction of the stationary cutting combs, a movable cutting comb within said lyre-shaped member, operated by said motor, performing a reciprocating movement in a longitudinal direction and provided with trapezoidal shaped teeth the sides of which graze said slanted back surfaces of the stationary cutting combs and the 5 smaller base surfaces of which slip along in the space between said edges of the stationary cutting combs.

2. A razor, comprising in combination a motor, a stationary cutting comb slidable on the skin 10 and a movable cutting comb operated by the motor and performing a reciprocatory movement on the back surface of the stationary comb, said back surface being inclinedto the skin-contacting surface of the stationary comb to form an 15 edge lying in the direction of oscillation and in 'proximity to the movable comb, and a second stationary member slidable on the skin and situated within a short distance from said edge, the pitch of the teeth of one of the cutting combs 20 being constant while that of the teeth of the other cutting comb varies over the length ofthe comb from a minimum to a maximum.

3. A razor, comprising in combination. a motr, a stationary cutting comb slidable on the skin 5 and a movable cutting comb operated by a motor and performing a reciprocatory movement on the back surface of the stationary comb, said back surface being inclined to the skin-contacting surface of the stationary comb to form an edge lying 30 in the direction of oscillation and in proximity to the movable comb, and a second stationary member slidable on the skin and situated within a short distance from said edge, the pitch of the teeth of the stationary'comb being constant and 35 the pitch of the teeth of the movable comb varying over the length of the comb.

4. A razor, comprising in combination a motor, a T-shaped member at least one flange of which forms a stationary cutting comb slidable on the skin, a second plate operated by said motor performing an oscillatory movement and positioned adjacent to the flange of said T-shaped member, at least oneportion of which second .plate forms. a movable cutting comb, the surface of which 45 adjacent to said stationary comb forms an obtuse-angled edge with its surface slidable on the skin, a third plate fixed on said T-shaped member adjacent to the movable comb plate and forming a second stationary member slidable on 50- the skin, the back of the flange of said T-shaped member grazed by the oscillating plate being inclined to its surface slidable on the skin to form a sharp edge lying in the direction of oscillation and in proximity to said obtuse-angled edge of 55 the movable cutting comb.

5. A razor, comprising in combination a motor, a stationary cutting comb having a back surface and a surface slidable on the skin and a movable cutting comb operated by said motor and performing a reciprocatory movement, said movable comb having a bottom surface and a shearing surface which form an obtuse-angled edge lying in the direction of oscillation of the movable comb, the shearing surface slidable on said back surface of the stationary comb, said back surface being inclined to the skin-contacting surface of the stationary comb to form an edge lying in the direction of oscillation and in 70 proximity to said obtuse-angled edge of the movable comb, and a second stationary member sit-' uated within a short distance from said edge of the stationary comb and having a surface slidable on the skin and being approximately flush with the surface of the stationary comb sliding on the skin.

6. A razor, comprising in combination a motor, a movable cutting comb operated by said motor, performing a reciprocatory movement and hav-, ing a bottom surfaceand two side surfaces which form obtuse angled edges with said bottom surface, a stationary cutting comb having a sur-- -flush with one another.

'7. A shaving implement comprising a tapered vibratory shear plate, a stationary shear plate overlying the vibratory plate, defining therewith the shearing plane of the implement and extending beyond the edge of the vibratory plate, the two plates presenting a skin-engaging surface of substantial area which lies in a single plane inclined at an acute angle to the shearing plane and which includes their common line of contact, said surface being effective for tensioning the skin being shaved.

8. A shaving implement comprising a movable plate presenting a skin-engaging face, and a stationary plate, both plates having edge recesses forming shear teeth, the plates being superposed and tapering to a common vertex offset with respect to their plane of contact and located in the stationary plate and presenting jointly a skinengaging face of substantial area lying in a single plane.

' 9. A razor, comprising in combination a mo tor, "a stationary cutting comb having a facecontacting surface and a back surface, and a movable cutting comb operated by said motor and performing a reciprocatory movement, said movable comb having a face-contacting surface and a shearing surface forming an obtuse-angled edge extending in the longitudinal direction of the head of the razor, the shearing surface being slidable on the back surface of the stationary comb, said back surface being inclined to said skin-contacting surface of the stationary comb and forming an acute-angled edge extending in the longitudinal direction of the head of the razor, the face-contacting surfaces of the stationary and movable combs being in substantially the same plane.

10. A razor, comprising in combination a mo- 3 tor, two stationary cutting combs arranged side by side and slidable on the skin and a movable cutting comb operated by-said motor and'pe rforming a reciprocatory movement, said movable comb having a bottom surface and two inclined side surfaces which form obtuse angles with said bottom surface, the two side surfaces sliding on the back surfaces of the stationary combs, said back surfaces being inclined in opposite directions to the skin-contacting surface of the stationary comb to form edges lying in the direction of oscillation,, said edges being grazed by the obtuse-anglededges of the movable comb.

11. A razor; comprising in combination amotor, a stationary cutting comb slidable on the skin 'and a movable cutting comb operated by said motor and performing a reciprocatory movement,

said movable comb having a bottom surface and a shearing surface which form an obtuse-angled edge lying in the direction of oscillation of the movable comb, theshea-ring surface being slidable on the back surface of the stationary comb, said back surface being inclined to the skin-contacting surface of the stationary comb to form an edge lying in the direction of oscillation and in proximity to said obtuse-angled edge of the movable comb, and a second stationary member slidable on the skin and situated within a short distance from said edge of the stationary comb, the pitch of the teeth of the stationary comb being other than the pitch of the teeth of the movable comb, so that the movable teeth cannot enter the spaces between the teeth of the stationary comb.

12. A razor, comprising in combination a motor, a stationary cutting comb slidable on the skin and a movable cutting comb operated by I said motor and performing a reciprocatory'movement, said movable comb having a bottom surface and a shearing surface which form an obtuse-angled edge lying in the direction of oscillation of the movable comb, the shearing surface being slidable on the back surface of the stationary comb, said back surface being inclined to the skin-contacting surfaces of the stationary comb to form an edge lying in the direction of oscillation and in proximity to said obtuse-angled edge of the movable comb, and a second stationary member slidable on the skin and situated within a short distance from said edge of the stationary comb, the teeth. of one of the cutting combs being, as seen in plan view, inclined with respect to the teeth of the other comb, so that the teeth of the movable comb cannot enter the spaces between the teeth of the'stationary comb.

MICHELE GRIVETTQ-

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