DE905341C - Cutting head for dry shavers - Google Patents

Description

(WiGBI. P. 175)

ISSUED MARCH 1, 1954

R4310 XI / 6p

The invention relates to a cutting head for dry shavers, which in itself known way an outer fixed knife comb and an inner reciprocating Has knife comb.

According to the invention, the slots between the knife bars of the outer knife comb run down the side of the cutting head for the access of long hairs, with the side wall of the inner knife comb being at a certain distance from the inner wall of the outer knife comb for the purpose of producing a chamber that receives the hair . The slots located between the knife bar of the inner diameter comb opening for receiving the long hair down, and the edges of the knife bars are chamfered.

By producing the free chambers it is achieved that long hairs enter these chambers without coming into contact with the knife bars of the inner knife comb. The chamfering of the edges of the knife bars of the inner knife comb ensures that the hair entering said chambers when the cutting head is working can freely enter the cutting zone and can therefore be separated cleanly.

In the embodiment which is preferably used, on the underside of the outer knife comb provided a rib that

for guiding and centering the inner knife comb serves.

The outer surface of the inner knife comb is preferably elastic to the back of the Knife bars of the outer knife comb pressed on.

The invention is explained in more detail with reference to the drawing, for example,

Fig. Ι is an enlarged side view of ίο part of an electric dry shaver, partly in section, with some parts broken away, and

Fig. 2 is a vertical cross-section thereto; Fig. Β is a plan view on an enlarged scale stick on one end of the inner and outer knife comb;

Fig. 4 is a section on the line 4-4 of Fig z., And

Figure 5 is a bottom plan view of the inner knife comb.

The shearing or cutting head 1 has a stationary one outer knife comb 2 and an inner knife comb 3, the inside of the outer Knife comb 2 is movable back and forth. The outer knife comb 2 has a longitudinal one Base plate 5 and side walls of a sheet metal shear plate of substantially inverted U-shaped cross-section (Fig. 2). The shear plate is on its outer side, the base plate 5 opposite end with a number of spaced apart straight ones and flat knife bars 6, which are separated in the middle by a recess 7, which is formed by an inwardly protruding guide rib 8.

The shear plate is provided at both ends with upwardly directed, bent end parts 9, whereby the rigidity of the design is increased. The side walls 10 of the outer knife comb 2 are set off at ii below the ends of the knife bars 6 (Fig. 2), whereby in the The design of the outer knife comb interacts with the bent end parts 9 and the rib 8 is additionally stiffened. The outer knife comb 6 is designed so that the Knife bars and slots extend down into the side wall 10, creating openings 12 are formed through which longer hairs between the knife bars 6 can move into the cutting head of the razor; the rib 8 is also below the ends of the knife bars 6 slotted, which can be seen in Fig. 2 at 13, around the entrance to ease the hair between the knife bars. The knife bars 6 are through in their middle Bridges 6 'connected to one another.

The inside of the knife bars 6 of the outer knife comb and the outside of the rib 8 are cleanly sanded and polished at 14 and 15, so that the desired thickness of the knife bars and the desired dimensions between the opposite outer side surfaces of the Rib 8 result. The grinding and polishing result in an essentially flat inner surface on the knife bars and flat guide surfaces on the rib 8.

The inner knife comb 3 consists of a sheet of metal that is substantially rectangular Cross-sectional shape is bent (Fig. 2). The abutting edges of the knife comb are located at the bottom of one side, as shown in FIG. 5 at 16. The knife comb 3 further comprises a pair of adjacent rows of knife bars 17 which are spaced parallel to one another are arranged and form slots between the knife bars. These two rows of Knife bars 17 are separated from one another by an inwardly extending rib 18, the inner side surfaces have a slightly larger distance from each other than the distance between the ground outer surfaces 1.5 of the guide rib 8, so that the rib 18 together with the rib 8 a guide for the inner knife comb as it moves back and forth within of the outer knife comb forms.

The side walls 19 of the inner cutter comb 3 have a distance from one another which is somewhat smaller is than the distance between the upper parts of the side walls 10 of the outer knife comb 2 (Fig. 2), so that open receiving spaces 20 for the hair between these parts are formed. This creates a combing effect of the outer knife comb, which takes long as well as short hair between its knife bars 6, so that the Free hair in the open slots between the knife bars 6 and in the hair-receiving ones Rooms are combed before they reach the cutting zone of the cutting head.

The knife bars 17 of the inner knife comb 3 have a TeHuHg ₁ which is twice as large as the pitch of the knife bars 6, so that they have a distance from one another that is equal to that of two knife bars 6 and therefore interact with every second knife bar 6 when the cutting head is working (Figures 3 and 4). The knife bars 6 on one side of the recess 7 and the corresponding knife bars 17 of the inner knife comb 3 are arranged offset from the knife bars on the opposite side of the recess 7 (FIG. 3). The knife bars 6 on both sides of the recess 7 are arranged alternately and offset so that the cutting edges of the knife bars on one side of the recess are offset by an amount equal to half the pitch of the knife bars on the other side. The knife bars 17 of the inner knife comb 3 are also wider than the knife bars 6 (Figs. 3 and 4) so that part of each knife bar is always in engagement with the lower surfaces of one or more knife bars 6 of the outer knife comb.

In order to increase the cutting action of the cutting head, the outer surfaces of the knife bars are 17 of the inner knife comb sharpened

and polished so that flat outer surfaces for the purpose of precise cooperation with the flat inner surfaces of the knife bars 6 are produced. In order to increase the cutting action of the cutting head on, the ends of the knife bar 17 are bent of the inner diameter comb to the sides 19 adjacent corners at an angle of about 30 ^0, which is indicated at 21, while the inner ends of the knife bar to which the rib 18 adjacent corners are folded at an angle of approximately 45 °, which is shown in FIG. 2 at 22. These beveled ends of the knife bars 17 are formed by grinding, so that sharp cutting corners are produced on the knife bars 17.

The usual spring-loaded balls 23 can be found in the base plate 5 of the shaving head be provided to press the inner knife comb 3 resiliently, so that the knife bars 17 during the cutting process to the Support the knife bars 6 of the outer knife comb. A rocker arm 24, by a electric motor, not shown, can be driven in a generally known manner used to give the inner knife comb 3 a reciprocating motion. the Balls 23 are larger than those commonly used; they are from the top ends of the in the base plate 5 provided pockets 25 received, which of correspondingly larger dimensions are in accordance with an oscillatory movement of the balls 23 back and forth with the inner knife comb 3 to allow wear and tear on the underside of the inner knife comb is reduced.

In a shaving head that is constructed in the vorbeschrieberien way, the middle part of the straight knife bars 6 interrupting the guide rib 8, the ground inner surfaces of the knife bars and the outer surfaces of the rib 8 ensure precise cooperation with the inner knife comb 3, so that this in the outer knife comb is guided precisely. The ground surfaces 15 on the rib 8 enable this precise guidance of the inner knife comb and hold it in such a position that the hair-receiving chambers 20 receive the hair combed through the ends of the knife bars 6, so that both long and short hair are effectively cut as soon as they come into contact with the sharp corners 21 at the outer ends of the knife bars 17 of the inner knife comb 3. The beveled ends 22 of the knife bar 17 see at their inner ends also sharp cutting edges for cooperation with the knife bar 6 prior to cut off both short and long hair, which occur between the knife bars 17 of the central slots 7 at _points} inwardly from the Ends of the knife bars 6 are (Fig. 4). The webs 6 'also cause short hairs to be straightened up and straightened out for their subsequent cutting off. The webs 6 'also help to obtain hair that has been cut short and precisely transversely, while avoiding cutting the hair in an oblique cut.

Claims (3)

Patent claims: 1. Cutting head for dry razors with an outer fixed knife comb and an inner, reciprocating knife comb, characterized in that the slots between the knife bars (6) of the outer knife ^{comb extend down on the side of the cutting 1} head and the side wall of the inner knife comb is at a distance from the inner wall of the outer knife comb, that furthermore the slots located between the knife bars (17) of the inner knife comb open downwards and the edges (21, 22) of the knife bars (17) are beveled. 2. Cutting head according to claim 1, characterized in that one on the underside of the outer knife comb provided rib (8) for guiding and centering the inner Knife comb (3) is used. 3. Cutting head according to claim 1 and 2, characterized in that the outer surface of the inner knife comb (3) resiliently to the back of the knife bars (6) of the outer Knife comb is pressed. Referred publications:
German Patent No. 635827;
Swiss patents No. 237 827,
520 1 sheet of drawings © 5782 2.54