DE1893000U - SHEAR HEAD FOR DRY SHAVERS. - Google Patents

Description

File number B 15-6 9W-A 9 GrM My reference Pf r / m _T ag 17 Mar Z 64

Applicant Braun Aktiengesellschaft, Frankfurt / H ,, Msselsh «. St.

Decision of 5 · Mar 2 64

Shaving head for dry razors

The price increase relates to shaving heads for dry razors with an outer cutting part in the form of a sieve plate or comb that slides or rolls on the skin and an inner cutting member, one of which is moved relative to the other and is preferably electrically driven. The inner shear part can again consist of a sieve plate or a set of knives Knives are inserted rigidly or individually movable in a knife block j it can be used as a driven part opposite the outer rotate or oscillate.

The two parts of the cutting system, also called the shaving head, are usually made of steel. There are sieve plates manufactured by galvanic processes are also known. In the case of steel, for reasons of corrosion protection and for protection against infections of the facial skin, coatings made of precious or non-ferrous metals are used.

The quality of the cut and thus the shear effect of a Such a dry shaver depends largely on the formation of the cutting edges on the knife or knives

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Letter from March 17, Z 64 sheet 2 Dipl.-Ing. Q. Sctiliebs

an -> j_ η -n j. j. j. tut ·· ι patent attorney

German Patent Office, Munich

the perforated edges of the sieve plates. The smaller the cutting edge radius, the softer and smoother the cut will be with a certain contact of the cutting system parts moving relative to each other, otherwise the whiskers will be more or less jammed and squeezed off, - ^ it is therefore common to grind at least the knives of the inner cutting part . On the other hand, a smaller cutting edge radius will also show faster wear due to the necessary contact pressure, so the cutting part will have a shorter service life, so that the initially good shearing effect will quickly deteriorate during use of the device. Contact pressure and friction essentially determine the ^XL drive it is the power of the device, which is particularly important for battery-operated dry shavers. These mutually incompatible requirements with regard to the quality of the cut and service life can only be solved by a compromise which only partially benefits the advantages of dry shavers over laßrasiergeräte

2ο makes valid.

According to the innovation, significantly better cutting quality and performance and tool life are achieved, if at least a cutting part of the shear system, preferably the inner cutting part, on the visual cutting edges with a known one 'Coating made of titanium arbide, boride or nitride and then it has been ground down to the base metal to such an extent that the edge rounding resulting from the pre-processing of the base metal has been removed.

To produce the coatings already used in cutting tools, one preferably uses one in Recently known process with which the titanium compounds by deposition from the gas phase

Letter from - | η . Mar Z 64 ^sheet 3 Dipl.-Ing. G. Schjiebs

an,, - ,, - .. τ patent attorney ·

German Patent Office Munich \ _

Temperatures around 1000 G are deposited on the base metal will. The coatings are firmly anchored in the base metal and are extremely hard. With punching and drawing tools, the service life is increased by an average of Sunf to six times established. It has been found that such coatings which can be made up to 1,000 mm thin, also on the thin shaving system parts used in '! rock shavers, like sieve plates and knives, can be applied without the high treatment temperatures change the structure of the basic detail or educate it to lead. If such warping occurs, you can fix it by suitable arrangement and mounting of the ! 'hurry to encounter during treatment. Steel sheets can be used at the end of the treatment time when leaving the treatment room hardened immediately by quenching in the furnace or subsequently subjected to hardening annealing. That • The appearance of the coatings depends on the structure of the Surface of the base material and can be matt to glossy.

However, the tests not only resulted in better stability and resistance, as expected against corrosion, but surprisingly there was also a significantly better quality of cut after grinding, which only decreased slightly even in long-term tests. The cutting edge radius on a sheet metal screen or knife without a coating is determined by the type and grain size of the abrasive and the grinding process, and there are many Do not fall below a thousandth of a millimeter. If, as proposed according to the innovation, the coating on the cutting edge is ground, the cutting edge radius is reduced to the thickness of the coating, which, as mentioned, / 1ooo mm thick can be set, and this radius remains because of the extraordinary hardness and good Connection of the coating with the base metal and because of the

Letter of March 17, 64 sheet 4 Dipl.-Ing. G. Schlfebs

^{at the} German Patent Office Munich patent attorney, · /.

low coefficient of friction that the coatings have compared to that of the base metal, practical obtain.

It is advantageous if the grinding process and means be adjusted so that the softer base metal is removed more than the coating, because then the The cutting edge receives a well-known, light hollow grind, which further improves the quality of the cut.

In order to take advantage of the low coefficient of friction of the coatings, it can be useful to use only one of the cutting parts, preferably the inner cutting part to grind because of its greater strength.

In the following some embodiments of the fire described on the basis of a drawing.

Pig. 1 to 4 show in cross-section in high magnification two cutter shapes, namely after you have applied the Coating (Pig. 1 or 3) and after grinding (Pig. 2 or 4) f

Pig. 5 shows a smooth shear screen, which together with a innovation according to the inner cutting part is to be used; in

Pig. 6 and 7 shows a shear screen with raised perforated edges before and after cutting *

In the pig. 1 to 4 with 1 the knife body is made of hardenable steel and with 2 the coating of titanium carbide or boride or nitride. The knife is usually semicircular or sickle-shaped. Bach to the application of the Coating is the Cutting edge ground down to dot-dash line 3,

Letter from March 17, Z 64 ^sheet 5 Dipl.-Ing. G. Schliebs

to _, _ _{,,,, T} .. patent attorney .ύ> ^: ~ "

German Patent Office Munich _

which is so deep that the knife shape when punching out resulting edge rounding is removed. The grinding process is in itself required to produce the Knife shape and, in the case of knife packages, necessary to ensure a uniform knife height.

Each of the grinding, the ground surface has 4 one received a slight hollow grinding, and their cutting edges 5 have an Eadius about the thickness of the coating 2, like in Pig. 2 at the top right again in a larger enlargement is shown. The arrow 6 indicates the direction of movement of the knife in the shaving head when it is oscillating Movement on.

Mg. 3 and 4 show another form, known per se, with a reinforced head. The coating also has an effect here With a very hard coating, it has a favorable effect on the cutting quality, because that which can only be achieved in the base metal is essential makes a coarser cutting edge radius without this coating the conicity of the lateral surfaces partially compensates for it (Fig. 3).

Fig. 5 shows a strong enlargement of a one-sided coated screen plate 7 made of steel or nickel with one of the numerous holes 8 for the passage of the whiskers. This sieve plate is for joint use with a refurbished, ground inner cutting part certainly. If this sieve plate is not re-ground in accordance with the new, what in the above-mentioned cooperation with a ground inner cutting part is not required, it is not subject to the protection claim. The knife or knives move below the Sieves past the holes (Fig. 2 or 4 in conjunction with Fig. 5). Through the one reaching into the holes This shear screen has a coating that has a favorable hole edge radius, which in terms of the quality of the cut

6 8 98 * 2.0.3J

Letter of March 17th, 64 sheets

^{at the} German Patent Office Munich patent attorney

is relevant. The screen plate has such flexibility that it adapts to the shape of the cutter head.

In Fig. 6 and 7, a sieve plate is shown with a solid line Hole edges 9 shown. The stability of the The wafer-thin perforated edges raised on the cut side are significantly improved by the innovative cover. To get a sharp shave, the coating on the contact side of the sheet is back down to the base metal abraded (lig. 7) · The coating can with Diamond paste can be polished.

The beveled coating in accordance with the innovation can also be used for dry razors with the same advantage for others Knife and sieve plate shapes, especially also for shear combs, can be used.

Claims (2)

RA.206 898 * 20,3.64 Letter from March 17, Z 64 sheet 7 Dipl.-Ing. Q. Schliebs ^ German Patent Office Munich Patent Attorney Ij_ Protection claims 1 «shaving head for a dry shaver with an outer cutting part in the form of a sieve plate or -comb and an inner cutting part, one of which moves relative to the other and preferably is electrically driven, characterized in that at least one Cutting part of the shearing system, preferably the inner cutting part, at its cutting edges with a well-known coating of titanium carbide, boride or nitride and then so far down to the base metal What is ground down is that the rounded edge of the base metal resulting from the machining is worn away. 2. Shaving head according to claim 1, characterized characterized in that the bevel is designed as a known light hollow grind. (Ed. 4)