AT521184A1 - cutting head - Google Patents

Abstract

In a cutting head (1) for a hair trimmer with one of a plurality of webs (6, 7) and slots (13) between the webs (6, 7) formed upper blade (5), which webs (6, 7) a contact surface ( 8) for contact with the skin and a contact surface (8) opposite shear surface form, as well as with a plurality of cutting blades (20), to be oscillated movement relative to the upper blade (5) drivable and on the shear surface of the upper blade (5) fitting guided lower blade ( 21), wherein at least one of the webs (6, 7) of the upper blade (5) with a in the plane of the contact surface (8) freestanding end (9) is formed, closes at the at least one web (6) with freestanding end (9 ) a prong (11) different from the upper blade (5).

Description

The invention relates to a cutting head for a hair clipper with an upper knife formed by a plurality of webs and slots between the webs, which webs form an abutment surface for skin contact and a shear surface opposite the abutment surface, and with a relatively large number of cutting blades to be oscillated lower knife that can be driven to the upper knife and is guided against the shear surface of the upper knife, at least one of the webs of the upper knife having an end that is free in the plane of the contact surface.

Such a cutting head has become known, for example, from EP 693 988 B1 and represents a modification of the known flat cutting units, which are widely used in particular as beard trimmers. In these cutting heads, a lower knife with a plurality of cutting blades is moved in an oscillating manner against an upper knife with a plurality of webs and slots formed between the webs. The upper knife and lower knife can be designed as stamped or etched sheets. The top of the upper knife, with the multitude of webs, forms a functional contact surface, which is brought into contact with the skin of the user during shaving, so that whiskers protrude through the slots between the webs and through the oscillating movement of the lower knife due to the shear effect between the shear surface of the Upper knife and the cutting blades of the lower knife are cut. The oscillating movement of the lower knife relative to the upper knife takes place with an electric drive which, by means of a suitable mechanism, converts the rotary movement of an electric motor into an oscillating movement or a Hin2 / 20

No .: R453 L1

27/04/2018 12:15

P.004 / 023

Apr 27, 2018 12:09 PM Haffner & Keschmann No. 2161 S.

and causing the lower knife to move relative to the upper knife at a relatively high frequency. In this way, hair can be cut without risk of injury to the user, even if the user does not take particular care during the shaving process with daily use.

In order, in particular, to be able to grasp short whiskers and whiskers lying flat against the skin and guide them into a slit in the upper knife, EP 693 988 B1 proposes forming individual webs of the upper knife with free ends which form in the Extending the plane of the contact surface, in contrast to the webs, which are deflected into a plane different from the plane of the contact surface, i.e. into a region of a side wall of the upper knife, these free-standing ends can act as set-up or threading elements for flat or short hair , so that the corresponding hair can also be reliably cut from the cutting blades of the lower knife on the shear surface of the upper knife. This represents an improvement in the thoroughness of the shave with a hair clipper or dry shaving apparatus with a flat cutting unit compared to the previously known upper knives which have no free ends of the webs.

With the increasing demands of users in the field of hair trimmers, razors and beard trimmers there is still a constant effort to further improve the thoroughness of the shave. The present invention is therefore based on the object of hair clippers or

Beard trimmer with flat cutting unit regarding the thoroughness of the shave with regard to the detection of / 20

No .: R453 L1

27/04/2018 12:15

P.005 / 023

Apr. 27, 2018 12:10 p.m. Haffner & Keschmann No. 2161 p. 6

problematic short or _flat hair with ...............

continue to improve simple constructive measures.

To achieve this object, a cutting head of the type mentioned at the outset is therefore further developed according to the invention in such a way that a prong different from the upper knife is connected to the at least one web with a free-standing end.

As already mentioned, top knives for dry shavers or hair clippers with flat cutting units are stamped or etched from sheet metal, which is an easy to automate and therefore inexpensive way of producing top knives and bottom knives for mass production. For setting up particularly short or flat-fitting hair, it can be useful not only to provide flat threading elements, such as those that can be formed from a stamped or etched sheet, but also the set-up or threading elements that are provided by the in the Free-standing ends of the webs are formed on the plane of the contact surface, to be supplemented by threading or erecting elements with different geometries. To produce the entire upper knife in a different way in order to realize more complex geometries than free-standing ends of webs would, however, increase the manufacturing costs in an unacceptable manner. According to the invention, however, it is now possible to arrange tines different from the upper knife on a web with a free end, then on the cutting head, so that for the manufacture of the upper knife. known methods can continue to be used and improved threading or stand-up elements are manufactured as separate tines according to any other suitable method and /

No .: R453 L1

27/04/2018 12:16

P.006 / 023

Apr. 27, 2018 12:10 p.m. Haffner & Keschmann No. 2161 p. 7. w, ···:.:::

• φ ~ 5 a ----- s _s —- · -

Cutting head can be added. Overall this results ..........

a cutting head with a flat cutting unit, in which bars with free ends are supplemented by a specially shaped threading or standing element in the form of a prong, so that a closer shave can be achieved with essentially constant production costs.

To optimize the threading and setting up of the problematic hair mentioned, it can be provided according to a preferred embodiment of the present invention that the at least one prong has a tapering tip at its end facing away from the free-standing end of a web of the upper knife. A tine with such a tapering tip is likely to slide under flat-lying hair when shaving and set it up, so that it is subsequently gripped by a bar with a free end and thus projects through the upper knife to the lower knife, where they can be cut off.

In addition to the advantages that can be achieved with different tine geometries, as just described, the invention also offers the possibility that the at least one tine is made of a material different from the material of the upper knife, different material, in particular from a material selected from the Group consisting of thermoplastics, elastomers, ceramics, in particular injection-molded ceramics (CIM) and metals, in particular injection-molded metal (MIM), is formed, as this corresponds to a preferred embodiment of the present invention. Due to the suitable choice of material for the tines, hair can also be brushed over, for example, by laying flat hair / 20

No .: R453 L1

27/04/2018 12:16

P.007 / 023

Apr. 27, 2018 12:10 p.m. Haffner & Keschmann No. 2161 p. 8

can be gripped and set up better with the tine than is possible with the free-standing metallic ends of the webs of the upper knife.

In order to further improve the effect of the tine as a threading or erecting element, it can be provided according to a preferred embodiment of the present invention that the at least one tine rises above the level of the contact surface. This means that the tine protrudes over the upper knife and, when the contact surface of the upper knife comes into contact with the skin, a particularly strong contact of the tine with the skin and the whiskers is achieved, so that the tip of the tine can penetrate more easily under flat hair and possibly from Material of the upper knife different material, in particular plastic material of the prong is pressed firmly to short or flat hair, adheres to it more strongly and can better position the problematic hairs mentioned when the cutting head is guided over a point to be shaved.

According to a preferred embodiment of the present invention, the cutting head is designed in such a way that the at least one web with an end that is free in the plane of the contact surface is shortened, in particular in comparison to a web with an end that is not free in the plane of the contact surface in the direction of the plane of the contact surface by the length of the extension of the tine, which offers the possibility of accommodating the tine adjoining the web with a free-standing end essentially within the imaginary width of the upper knife without the tines, in order to possibly add additional shear elements, such as Shaving foils, / 20

No .: R453 L1

P.008 / 023

27/04/2018 12:17

Apr 27, 2018 12:11 PM Haffner & Keschmann No. 2161 p. 9

........... ··. . ··. & ··. ···:.:::

···· · · · · · '· · · · ·

Tailors to be able to combine without having to deviate from existing construction dimensions. This allows the present invention to be implemented inexpensively and directly in a plurality of products within a product range, without having to significantly change the production of these hair clippers or dry shavers.

With the cutting head according to the invention, the at least one tine is advantageously guided so as to be movable in the longitudinal direction of the upper knife, which increases the effect of the tine as a threading or. Stand can further improve. This applies in particular when the at least one prong is coupled to the lower knife for movement in the same or opposite direction, in particular a curved movement, in particular movement at least in the form of a segment of a circle, transverse to the plane of the contact surface, as corresponds to a preferred embodiment of the present invention. The coupling of the at least one prong to the movement of the lower knife is carried out in essentially the same way as the coupling of the lower knife to the drive, which is a common measure for the person skilled in the field of the production of hair clippers, dry shavers and the like.

According to a preferred embodiment of the present invention, the at least one prong is coupled to the lower knife for reduction via a rocker arm to the lower knife. This measure means that the at least one tine oscillates over a shorter path than the lower knife, and it can be ensured, with suitable dimensioning of the rocker arm and the articulation points, that the tine only oscillates within the distance that is between without / 20

No .: R453 L1

27/04/2018 12:17

P.009 / 023

Apr 27, 2018 12:11 Haffner & Keschmann No. 2161 p. 10 ·· ·· ·· ···· · · ·

...... --- S · - · -. · - · --- · ···· free-standing ends formed webs is defined so that the at least one prong does not collide with the upper knife. This would lead to premature material fatigue of both the at least one prong and the upper knife and would also result in increased effort on the part of the drive and, as a result, a higher power consumption of the hair clipper with a cutting head according to the invention.

If a plurality of webs with free ends are provided on a cutting head according to the present invention and accordingly a plurality of tines which connect to the webs with free ends, it is preferred that a plurality of tines are arranged on a common tine carrier is. In this preferred embodiment, the tines originate from a common component which extends along the longitudinal extent of the upper knife, such a tine carrier being able to be arranged on both sides of the upper knife if the upper knife is constructed symmetrically along its longitudinal axis and therefore has webs in the plane of the Contact surface has free ends on both sides. The tine carrier can essentially be coupled to the drive or the lower knife like the lower knife for coupling the movement of the tines, which is easier and less expensive to do with a plurality of tines than to assemble and drive the individual tines separately.

In order to be able to stably provide an upper knife with free ends of the webs, it is desirable to connect the webs with non-free ends to one another, as this automatically results if, for example, / 20

No .: R453 L1

27/04/2018 12:17

P.010 / 023

Apr 27, 2018 12:12 PM Haffner & Keschmann No. 2161 p. 11

Slits are punched out of a flat sheet metal so that ridges and slots remain in the sheet metal to form the upper knife. However, the connection of the webs to the ends that are not free in the plane of the contact surface would negate the effect of the webs with free end, so that according to a preferred embodiment of the present invention it is provided that webs not in the plane of the contact surface free-standing end are connected to one another in a level different from the level of the contact surface by a longitudinal connector formed in one piece with the upper knife. The webs with an end that is not free-standing in the plane of the contact surface are accordingly bent into a plane different from the plane of the contact surface and are connected to one another in this plane with a longitudinal connector or a longitudinal connector element, which is formed from the upper knife, in order to achieve the necessary To ensure the stability of the upper knife for safe and permanent operation.

The invention is explained in more detail below on the basis of an exemplary embodiment schematically illustrated in the drawing. In this show

1 is a perspective view of a cutting head according to the invention, which is supplemented by shaving foil elements,

Fig. 2 is a detailed view in perspective of the upper knife with prongs and

3 shows a perspective view of a functional unit of the cutting head according to the invention in the assembled state, / 20

No .: R453 L1

27/04/2018 12:18

P.011 / 023

Apr. 27, 2018 12:12 p.m. Haffner & Keschmann No. 2161 p. 12

4 is a partially exploded view of the cutting head according to FIG. 2,

Fig. 5 is a perspective view of the cutting head of FIG. 3 with prongs.

In Fig. 1, the reference numeral 1 shows a cutting head of a hair trimmer, such as a beard trimmer or dry shaver. The cutting head 1 is optionally pivotally mounted in the sense of the double arrows 2 and 2 'on a handle 3, which handle 3 has components, not shown, such as power supply, drive and operating elements. 4 denotes shaving foil cutting elements, as are well known in the prior art and are not a mandatory part of the present invention. The cutting head 1 according to the invention now has an upper knife 5, which according to the invention is supplemented by prongs 11.

In FIG. 2 it can be seen that the upper knife 5 has a plurality of webs 6, 7, some of which are designed as webs 6 with ends 9 that are free in the plane of the contact surface 8. The webs 6 with free ends 9 are bound by a longitudinal member 10 to webs 7 with a non-free end. The free ends 9 of the webs 6 are joined by tines 11 which differ from the upper knife 5 and which run on a common tine carrier 12 to the side of the upper knife 5 along the longitudinal extent of the upper knife 5. The tines 11 have a more complex geometry than the simply formed free ends 9 of the webs 6 and can therefore be used for the purposes of setting up short or flat beard hairs and feeding them into / 20

No .: R453 L1

27/04/2018 12:18

P.012 / 023

Apr. 27, 2018 12:12 Haffner & Keschmann Nr, 2161 S the slots 13 between the webs 6, 7 have been optimized, which, as already explained above, concerns not only the geometry but also the material of the tines. The webs 7 with an end which is not free-standing in the plane of the contact surface 8 are connected to one another in a plane different from the plane of the contact surface 8 by a longitudinal connector 25 formed in one piece with the upper knife 5.

In FIG. 3 it can be seen that the upper knife 5 is connected via connecting elements 14 to a lower frame 15, in which springs 16 act on a carrier 17 for a lower knife 21 not visible in FIG. 3 (see FIG. 4) in order to do this To press the lower knife 21 against the upper knife 5, so that the lower knife 21 is guided against the upper knife 5, more precisely against the shear surface thereof, which shear surface of the contact surface 8 is formed on the upper knife 5. The drive, not shown, can engage with a suitable means in a groove 18 on the carrier 17 of the lower knife, so that this movement to be oscillated is driven in the direction of the double arrow 19.

In Fig. 4, the lower knife 21 can now also be seen, which has a plurality of cutting blades 20 which cooperate with the webs 6, 7 of the upper knife 5 for cutting hair.

In FIG. 5 it can again be seen that tine carriers 12 can be arranged on both sides of the upper knife 5 in order to carry the tines 11, which connect to webs 6 with a free end 9. The tines or the tine carriers are connected to the movement of the lower knife 21/20 with a driver 22

No .: R453 L1

27/04/2018 12:19

P.013 / 023

Apr 27, 2018 12:13 PM Haffner & Keschmann No. 2161

P. 14

coupled so that the tine carrier 12 or the tines 11 and the lower knife 21 can oscillate in the sense of the double arrow 23, it being also possible, with a suitable configuration of the driver 22 and the tine carrier 12, for a circular segment-shaped oscillating movement of the tine carrier 12 or the tines 11 to realize in the sense of the double arrow 24.

Claims (10)

1. Cutting head (1) for _a hair clipper with an upper knife (5) formed by a plurality of webs (6, 7) and slots (13) between the webs (6, 7), which webs (6, 7) have a contact surface ( 8) for skin contact and eme the shear surface opposite the contact surface (8), and with a lower knife (a) which has a plurality of cutting blades (0) and can be driven to oscillate relative to the upper knife (5) and is guided against the shear surface of the upper knife (5) 21), at least one of the webs (6, 7) of the upper knife (5) being formed with an end (9) which is free-standing in the plane of the contact surface (8), characterized in that on the at least one web (6) with free-standing End (9) is connected to a prong (11) different from the upper knife (5). 2. Cutting head according to claim 1, characterized in that the at least one prong (11) has a tapering tip _at its' freestanding end (9) of a web (6) of the upper knife (5). 3. Cutting head according to claim 1 or 2, characterized in that the at least one prong (11) _aU s a material different from Materi _a l of the upper knife (5) material, in particular a Material'ausgewählt from the group consisting of thermoplastics, elastomers, Ceramic, in particular injection-molded ceramic and metals, in particular injection-molded metal, is formed. 4. Cutting head according to claim 1, 2 or 3, characterized in that the at least one prong (11) rises above the plane of the contact surface (8). 13/20 No .: R453 L1 27/04/2018 12:19 P.015 / 023 Apr 27, 2018 12:14 PM Haffner & Keschmann No. 2161 p 5. Cutting head according to one of claims 1 to 4, characterized in that the at least one web (6) _{with in the} plane of the contact surface (8) free end (9) compared to a web (7) with in the plane of the contact surface (8) non-free end in the direction of the plane of the contact surface (3) is shortened, in particular by the length of the extension of the tine (11). 6. Cutting head according to one of claims 1 to 5, characterized in that which is guided at least one prong (11) movable i _n the longitudinal direction of the upper knife (5). 7. Cutting head according to one of claims 1 to 6, characterized in that the at least one prong (11) is coupled to the lower knife (21) for the same or opposite movement, in particular a curved movement, in particular at least circular segment-shaped movement transversely to the plane of the contact surface (8th). 8. Cutting head according to one of claims 1 to 7, characterized in that the at least one prong (11) with the lower knife (21) for reduction via a rocker arm with the lower knife (21) is coupled. 9. Cutting head according to one of claims 1 to 8, characterized in that a plurality of tines (11) on a common tine carrier (12) is arranged. 10. Cutting head according to one of claims 1 to 9, characterized in that webs (7) with in the plane of the contact surface not free end in a different from the plane of the contact surface (8) by a different level