US2395296A

US2395296A - Dry-shaving apparatus

Info

Publication number: US2395296A
Application number: US573708A
Authority: US
Inventors: Schwab Jean
Original assignee: Individual
Current assignee: Individual
Priority date: 1944-06-19
Filing date: 1945-01-20
Publication date: 1946-02-19
Anticipated expiration: 1963-02-19

Description

Feb. 19, 1946.

J. SCHWAB DRY SHAVING APPARATUS Filed Jan. 20, 1945 I Sghwab Patented Feb. 19, 1946 Application January 20. 1945. Serial No. 573,708 In Switzerland June 19, 1944 8 Claims.

This invention relates to a dry shaving apparatus of the type comprising a rotating drum and therein a stationary cutting member supporting the drum, both being provided with apertures, wherethrough must enter the hair which is to be cut, whereby the apertures of the cutting member cooperate with the moving apertures of the drum.

According to one feature of the invention, the apertures of the rotating drum are arranged in rows along helical lines and those of the cutting member are constituted by transversal slits which form acute angles with the axes of the drum and of the cutting member and extend through the upper portion of the cutting member.

Preferably the apertures of the rotating drum have rectangular shape, whereof the long side is placed on a helical line, and the slits of the cutting member are arranged approximately at right angles with regard to said helical lines.

In a modification of said features, the acute angles between the slits of the cutting member and the axis diminishes from one side of the supporting portion of cutting member to the other.

Another feature of the invention is to provide the inner surface of the rotating drum. along the apertures, with cutting edges.

With the foregoing and other features in view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto.

In the drawing, which illustrates a preferred embodiment, of the invention,

Fig. 1 is a frontal view of the dry shaving apparatus and I Fig. 2 is a lateral view to Fig. '1.

Fig. 3 shows a longitudinal section through the apparatus along the axis of the drum.

Fig. 4 shows a cross section at a right angle to said axis of the drum.

The dry shaving apparatus comprises a twopart handle I, the two halves of which are of essentially equal shape and are fixed together by a screw connection 2. The top portion of the handle I presents a cylindrical recess 3, wherein the drum 4 is so located that about one third of the circumference of the drum is not enclosed and extends beyond the upper end of the handle I. The diameter of the cylindrical recess 3 is a little bigger than the diameter of the drum 4, so that the latter can easily rotate within said recess 3. The drum 4 has a very thin cylindrical wall wherein are provided rectangular apertures 4a, which are arranged in rows along helical lines. The drum wall is reinforced at each end by a stiifening ring 5. The cutting member 6 is va tubular body mounted upon lateral supports III of the 'handle I and extending coaxially through the drum 4 for supporting the latter from inside. The supporting surface I of the tubular body I5 is therefore machined to correspond with the curvature of the inner drum surface, while the inner surface 8 of the tubular the recess 3 which partly encloses the drum 4.

A flap cover II at each end of the tubular body 6 is mounted by thepivots I2 in the handle I and has a nose I3 which projects beyond pivots I2 into an annular groove I4 of a button I5. The two buttons I5 are slidable in a bore I6 of the handle 'I and held apart by a spiral spring I1 10- cated therein, whereby the two covers I I are kept closed. In order to protect the rotating drum 4, when the apparatus is not used, a cap I8 having lateral slits I9 is pushed over the top portion of the handle I and secured by means of these slits I9 at the buttons I5.

The manipulation of the dry shaving apparatus is the following: The cap I8 is taken off. The apparatus is then seized with one hand at the handle I and the drum 4 is brought into contact with the surface to be shaved. By moving the apparatus to and fro and simultaneously exerting a slight pressure upon said surface, the drum 4 is rotated due to the friction between the drum 4 and the surface to be shaved. The hair enters through the apertures 4a into the slits 9 and is out off by the outer cutting edges along the slits 9 of the cutting member 6 inside the rotating drum 4, as the apertures 4a of the drum 4 move across the ribs between the .slits 9 of the cutting member 6.

The apertures of the drum may have the shape of squares or rectangles or general parallelograms or trapezoids and the edges inside along these apertures are preferably bevelled. The helical lines, wherealong the rows of apertures are arranged, should preferably cross the slits of the cutting organ approximately at a right angle. The slits in the cutting organ may follow curved lines, which form at one end a less acute angle provided with a cylindrical recess in the top portion, a rotating drum partly enclosed in said recess, a stationary cutting member extending Y through said drum and supporting the same, said drum and cutting member being each provided with apertures, wherethrough must enter the hair which is to be cut, said apertures in the Jacket of said drum being arranged in rows along helical lines, and said apertures in the cutting organ being constituted by transverse slits which extend through the upper portion of said cutting member and form acute angles with the axes of said drum and of said cutting member.

2. Dry shaving apparatus comprising a twopart handle provided with a cylindrical recess in the top portion, a rotating drum partly enclosed in said recess, a stationary cutting member extending through said drum and supporting the same, in the cylindrical Jacket of said drum a multitude of apertures having the shape of parallelograms and being arranged in parallel helical rows, and transverse slits extending obliquely across the upper portion of said cutting member, so as to form approximately right angles with said helical rows of apertures in said drum.

3. Dry shaving apparatus comprising a twopart handle having a cylindrical recess in the top portion, a rotating drum partly enclosed in said recess, a stationary cutting member extending through said drum and supporting the same, in the cylindrical jacket of said drum a multitude of apertures having the shape of parallelograms which are arranged in parallel helical rows, whereby adjacent rows of apertures are staggered to each other, and transverse slits extending obliquely across the upper portion of said cutting member, so as to form approximately right angles with said helical rows of apertures in said drum and acute angles with the axes of'said drum and said cutting-member.

4. Dry shaving apparatus comprising a twopart handle having a cylindrical recess in the top portion, a rotating drum partly enclosed in said recess, a stationary tubular body extending coaxially through said drum and supporting the same, in the cylindrical jacket of said drum a multitude of rectangular apertures arranged in rows, with their long sides along helical lines, and transverse cutting slits extending obliquely approximately across the contacting portion of said tubular body with said drum, thereby forming approximately right angles with said helical rows of apertures in said drum and acute angles with the axes of said drum and said tubular body.

5. Dry shaving apparatus comprising two-part handle having a cylindrical recess in the top portion, a rotating drum partly enclosed in said recess, a stationary tubular bod extending coaxially through said drum and supporting the same, in the cylindrical Jacket of said drum a top portion, a'rotating drum partly enclosed and axially guided in said recess, a stationary tubu lar body extending coaxially through said drum and supporting the same by means of a contact surface, the curvature of which is equal to that of the interior surface of said supported drum, in the cylindrical jacket of said drum a multitude of rectangular apertures arranged in helical rows, said apertures getting smaller inwards, as the lateral surfaces around each aperture form acute angles and edges with the above-mentioned interior surface of the jacket, and transverse cutting slits extending obliquely at least across the contacting portion of said tubular body with said drum, thereby forming approximately right angles with said helical rows of apertures in said drum and acute angles with the axes of said drum and said tubular body.

7. Dry shaving apparatus comprising a twopart handle having a cylindrical recess in the top portion, a rotating drum partly enclosed and axially guided in said recess, a stationary tubular body extending coaxially through said, drum and supporting .the same, a tumable flap cover at each end of said cylindrical recess, in engagement with said two flap covers a spring actuated closing member, which is operable against the action of the spring for opening said covers, in the cylindrical jacket of said drum a multitude of apertures having the shape of parallelograms and being arranged in parallel helical rows, and transverse. cutting slits extending obliquely at least across the supporting portion of said tubular'body, thereby forming approximately right angles with said helical rows of apertures in said part handle having a'cylindrical recess in the top portion, a rotating drum partly enclosed and axially guided in said recess, a stationary tubular body extending coaxially through said drum and supporting the same, a swingable flap cover at each end of said cylindrical recess, in engagement with said two flap covers a spring actuated closing member, which is operable against the action of the spring for opening said covers, in the cylindrical iacket of said drum a multitude of apertures having the shape of parallelograms and being arranged in parallel helical rows, and curved transverse cutting slits extending from one side of the supporting portion of the tubular body to the other, thereby forming at one end a less acute angle than at the other end with respect to the axes of said drum and of said tubular .body.