DE1188473B - Sieve-like fixed knife intended for the shaving head of dry razors - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CI .:

B 26b

German class: 69-12 / 02

Number: 1188 473

File number: A 444781 c / 69

Filing date: November 5, 1963

Opening day: March 4, 1965

The shaving head of dry razors is known to have a sieve-like fixed knife in the form a thin flexible metal foil, which with a large number of regularly distributed small Passage openings is provided. On the brushed by the moving knife of the shaving head and mostly ground underside of the fixed knife, the passage openings are sharp-edged, so that cutting knife edges result in connection with the cutting knife edges of the movable knife shear the stubble protruding through the passage openings. At the on the other hand, when shaving the top of the fixed knife resting against the skin, the passage openings are each depending on the manufacturing process used, either sharp-edged or more or less pronounced rounded. It is also known to widen the passage openings towards the top in a funnel shape, in order to thereby obtain an easier sliding of the upper side of the fixed knife on the skin. The Passage openings themselves have already been given the most varied of shapes. They are round oval, rectangular, T-shaped and rhombic, hexagonal passage openings, the latter predominantly from the shape of regular hexagons of suitable dimensions has been used.

However, experience has shown that the quality of the shave that can be achieved with the known dry razors remains still lagging behind those who lathered themselves up by lathering and using the usual razor or the normal razor blade. When using dry razors, in usually do not avoid having to shave more often than when shaving with a razor or Razor blade appears necessary.

The present invention is concerned with one for the shaving head of dry razors Sieve-like fixed knife, the passage openings of which are hexagonal and the one from the movable one Knife of the shaving head have coated underside cutting edges. A significant improvement the shaving quality is now achieved according to the invention in that with sharp-edged training the passage openings also on the upper side which rests on the skin during shaving, these shape of elongated hexagons, the two shorter parallel sides of which are parallel to the smaller one clear width of the hexagons and at least approximately parallel to the direction of movement of the movable knife of the shaving head are arranged.

An embodiment of the invention for the shaving head of dry razors certain sieve-like fixed knife

Applicant:

APAG, Apparatebau AG Goldach,
Goldach (Switzerland)

Representative:

Dipl.-Ing. A. Wedde, patent attorney,

Munich 27, Schumannstr. 2

Named as inventor:

Ernst Ritter, St. Gallen (Switzerland)

Claimed priority:

Switzerland 6 June 1963 (7074)

Fixed knife is shown schematically in the drawing, namely shows

F i g. Figure 1 is a plan view of part of the top of the fixed knife showing the shape and orientation of the passage openings illustrated, and

F i g. 2 shows a cross-section through the fixed knife in one at the location of the passage openings compared to FIG. 1 greatly enlarged scale. According to FIG. 1 have the passage openings 3 the Shape of elongated hexagons, the shorter parallel sides of which are parallel to the smaller clear width of the Hexagons run. In the illustration of FIG. 1 is assumed that the not reproduced movable knife of the shaving head performs a rapid back and forth movement between left and right. The normal shaving motion with which the fixed knife is moved over the skin then takes place in oscillating between above and below, d. H. as usual, transversely to the direction of movement of the movable one Knife. The shorter parallel sides of the hexagonal passage openings 3 are therefore practically parallel oriented to the direction of movement of the movable knife.

The upper or outer side 2 of the fixed knife which is in contact with the skin during shaving is in the illustration of FIG. 2 at the top, while accordingly the bottom or inside 5, lengthways which slides the movable knife of the shaving head, is shown in FIG. 2 extends below.

509 517/67

Compared to the bottom or inside 5 of the fixed knife, the boundaries of the Durchlaßöff openings 3 form the usual sharp edges 4, which act as cutting edges and shear off the stubble penetrating from the top or outside 2 in connection with the knife edges of the movable knife. Furthermore, however, the boundaries of the passage openings 3 with respect to the upper or outer side 2 are also designed with sharp edges 1. The method for producing the fixed knife is to be selected accordingly, and it is therefore not only, as usual, to provide the lower or inner side 5, but optionally also the upper or outer side 2 of the same with a corresponding cut.

The sharp upper or outer edges 1 do not act, as one might assume, as additional cutting edges, but rather, when brushing over the skin, they cause the beard, which mostly emerges more or less obliquely from the skin, first erect and after opening - Direction at the bottom or inside sharp edge 4 are cut off in a practically vertical direction. As tests have shown improving Rasiergüte thus achieved is predominantly caused by this prior erecting the stubble. This appears to be illuminating insofar as the normal razor or the razor blade, which is guided over the skin , has a similar effect, the stubble on the straightening effect before the stubble itself is cut off. However, this erecting effect is definitely not present when the passage openings 3 are widened conically towards the top or outside 2 or have rounded transitions.

The above-mentioned straightening effect of the sharp upper or outer edges 1 of the passage openings 3 can only be fully effective if the clear width of the passage openings 3 is sufficiently large in the direction of the normal shaving movement of the shaving head on the one hand, but also in the direction of movement of the movable one on the other Knife of the shaving head is sufficiently small. If one takes into account the further requirement, according to which the cutting lower or inner edges 4 of the fixed knife should run at an oblique angle to the direction of movement of the movable knife of the shaving head in order to achieve a good shearing effect, then one will refer to the above-described and in FIG. 1 through openings 3 shown, the shape and orientation of which in conjunction with their sharp upper or outer edges 1 ensures the desired improvement in shaving quality.

Claims (1)

Claim: For the shaving head of dry razors, a sieve-like fixed knife with its passage openings are hexagonal and have cutting edges on the underside swept by the movable knife of the shaving head, thereby characterized in that with sharp-edged training of the passage openings also on the When shaving, the upper side lying against the skin takes the form of elongated hexagons whose two shorter parallel sides are parallel to the smaller clear width of the hexagons and at least approximately parallel to the direction of movement of the movable knife of the Shaving head are arranged. Considered publications:
German Patent Nos. 1,051,162, 1,052,205, 1,119,716;
British Patent No. 152 211. 1 sheet of drawings 509 517/67 2.65 © Bundesdruckerei Berlin