EP2945508A1

EP2945508A1 - Device for producing permanent waves

Info

Publication number: EP2945508A1
Application number: EP14706264.0A
Authority: EP
Inventors: Mattias RUGGENTHALER
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-01-17
Filing date: 2014-01-17
Publication date: 2015-11-25
Anticipated expiration: 2034-01-17
Also published as: EP2945508B1; WO2014110615A1; AT513880A1; AT513880B1

Abstract

The invention relates to a device for curling hair, said device comprising an elongated lower part, which has multiple waves in the longitudinal direction, for the placement of the hair and an upper part for clamping the hair between the upper and lower part. The invention is characterized in that: i) the lower and upper part are separate from each other; ii) the lower and upper part are each a strip which is waved in the longitudinal direction and has an aspect ratio of at least 3:1; iii) the waves of the strips have radii of curvature which correspond to one another so that the lower and upper part fit into each other; and iv) the lower and upper part are each ladder-shaped.

Description

Device for the production of perms

The invention relates to a device for wavy shaping of hair. STATE OF THE ART

Wavy shaping of hair, i. Laying and fixing the hair in "perms" has long been regarded as aesthetically pleasing to many people, and there are and are a variety of chemical, mechanical, and electrical tools for doing so. Heating of the shaped hair to achieve a more permanent wave has been known for several millennia, and clay ton curlers have also been used in Egypt 5,000 years ago. In ancient Rome, the so-called calamistrum was used for the same purpose: a tube of metal for winding up the hair, which was either heated by itself or into which a hot rod was inserted.

In modern times, then came a little more complex mechanical devices for waves of hair in fashion, such. B. pinch and papillae. Already in 1927 a patent for a corrugated shears was issued in DE 445 850, with which the hair is pressed by means of a two-pronged fork leg of the scissors into two troughs of a corrugated slab ice. Since 1957, hair wave clips have been known from GB 814,008 in which a separate elongated clip is required for each wave in the hair. These clips each consist of two U-shaped, i. curved in the transverse direction to the hair, flat, perforated or grid-like elements which are connected to each other via a spring-biased joint. The disadvantage of these devices was the small number of waves in the hair that could be generated per device.

Subsequent developments have therefore often used corrugated plates with a larger number of waves on which the hair can be placed and pressed with a second part in the waves. For example, DE 2,835,477 A1, published in 1980, describes a two-part device, the two parts of which - similar to the above hair clips - are connected to one another via a joint which is either attached to a forehead or a side surface of the substantially rectangular lower part may be provided. On the opposite side, a snap closure may be provided for fixing. The two parts are a corrugated, flat plate, which serves as a lower part, and a multi-web upper part, the webs are inserted into the Wellentä- ler of the base, which is similar to the arrangement of a wave scissors. The plate of the lower part comprises openings arranged close to each other and may preferably also consist of wire mesh, ie have lattice shape. In the drawings, five shafts and webs are shown, so that with this device a greater number of waves can be generated in the hair than with previous devices. However, the device is difficult to handle, especially when the joint between the lower and upper part is provided at the end facing the hairline, and also has a not inconsiderable weight due to its size, even if the planar element is in lattice form. In the published in 1987 DE 36 06 718 A1, a two-piece device is also described, the two parts are connected via a hinge. In this case, however, both parts are corrugated, flat plates whose radii of curvature of the shafts are matched to one another in such a way that the two fit together when the device is folded. The plates, which may also be designed as lattice again, each have a downwardly tapered triangular shape, with their width decreases in pointing away from the hairline direction. The hinge is provided on the side facing the hairline, ie the folding axis extends horizontally when used, on the other - when using the bottom - end may again be a locking connection between the upper and lower part. While this device may sometimes generate a greater number of waves, it is difficult to handle because of the full width joint near the hairline.

The DE 37 09 273 A1 published in 1988 by the same inventor discloses a device very similar to DE 36 06 718 A1, but here the hinge is provided laterally, ie in use the folding axis runs vertically. In addition, a centrally provided between lower and upper part third part may be provided so that two strands of hair on different levels can be treated simultaneously. By attaching the joint in a lateral position, the device is easier to handle than its predecessor, the weight is still - despite optional lattice construction - quite considerable.

In addition, the size of the devices of the last three documents obstructs the simultaneous use of a sufficient number of them in order to be able to wave substantially all of the hair at the same time. This can be seen inter alia Fig. 6 of DE 28 35 477 A1, where it can be seen that the hair is inserted only about half the length in the device. However, if you were to perform this device twice as long, their weight would increase the tensile stress even further.

Furthermore, the downwardly tapered triangular shape of the devices from DE 37 09 273 A1 and DE 36 06 718 A1 entail that the individual hairs of a hair strand inserted into the respective device can no longer rest in parallel on the device towards the end. With any enlargement of the dimensions of the device to overcome this drawback, its width at the upper end increases proportionately too much that scarcely more than one or two devices at a time, i. next to each other, can be used.

In addition to the disadvantages already mentioned, all the devices described above are unfavorable in terms of the stress on the hair during the corrugation. Hair curlers, in which the hair is wiggled several times around a usually round part and dried and thus waved in this state, have the disadvantage that the hair strands are twisted during the winding process, sometimes even several times. This not only stresses the hair, but also causes less chemical bonds to be created during the drying process, which serves to produce waves corresponding to the shape of the winder, and hence less permanent undulation. In this connection, it should be mentioned that the generation of permanent waves is a two-step process: First, cystine bonds, ie disulfide bonds between two cysteines in the hair keratin amino acid sequence, are broken by treatment with a reducing agent, such as thioglycolic acid, thereby softening the hair and becomes malleable. After forming, the disulfide bonds are restored by reoxidation during drying, be it with atmospheric oxygen or an oxidizing agent applied to the hair, such as hydrogen peroxide, H2O2. With the above-described devices comprising corrugated plates or similar planar elements, while a twisting of the hair is largely avoided, but they are - in addition to the sometimes difficult handling - also problematic insofar as the hair when pressed into the troughs very heavily loaded and especially stretched. Because of this stretching, only relatively few disulfide bridges can form again during the oxidation process during drying, which in turn results in a lower durability of the perm. In addition, the drying process is slowed down by the use of flat elements, since the escape of water is hindered. Furthermore, movements of the hairstyles inserted between two flat elements can roughen the hair, which on the one hand causes the hair to become brittle and, on the other hand, hinders the formation of disulfide bridges again. This effect is particularly pronounced if the flat elements consist of close-meshed lattices, since in these cases numerous points of contact with the hair exist. Particularly disadvantageous are gratings which are formed by grid elements with an angular vertical cross-section, but also in grids of elements with round cross-sections, that is, for example, between wire mesh elements, this roughening effect occurs.

Against this background, the object of the invention was the development of a new device with which the above disadvantages can be at least partially avoided. DISCLOSURE OF THE INVENTION

This object is achieved by the invention by providing a device for wavy shaping of hair, comprising an elongated lower part which has a plurality of waves in the longitudinal direction, for laying on the hair, as well as an upper part for clamping the hair between the upper and lower part, and is characterized that:

i) the lower and upper parts are separated;

ii) the top and bottom are each a longitudinally corrugated strip having an aspect ratio of at least 3: 1;

iii) the waves of the strips have corresponding radii of curvature so that the lower and upper parts fit together; and

iv) have lower and upper part respectively ladder shape.

By means of such a device, a whole series of the disadvantages described above is eliminated.

Ad i): First, the separate presence of the upper and lower part avoids the provision of a joint, which simplifies the insertion of strands of hair into the device. More specifically, the hair only needs to be placed on the lower part, after which the upper part is applied and connected in any way with the lower part, which will be explained later in more detail.

Ad ii): The strip shape of the device with an aspect ratio of at least 3: 1 makes many devices of the invention usable side by side, even when very long hair is to be curled, yet the weight of the device can still be kept low. With a device according to the invention thus substantially the entire hair can be corrugated at the same time. With a smaller aspect ratio than 3: 1, the width of the device would be too large, especially if the device is dimensioned so that even relatively long hair, eg 30 cm in length or more, can be treated in its entirety. However, an aspect ratio of more than 10: 1 is not preferred in the present invention, because then the stability of the device decreases too much, so either more stable materials used or structural reinforcements must be provided. Both would increase both the weight of the device and the manufacturing cost. Ad iii): As is known per se from some prior art documents, the corrugations of the strips according to the present invention also have mutually corresponding radii of curvature, so that the lower and upper parts fit into one another. However, since the two parts of the device according to the invention are separate from each other, the radii of curvature of all shafts should be substantially the same, so it does not matter which part is used as the upper part and which lower part and in what orientation the two parts with interposed hair to be fitted together. Namely, according to a particularly preferred embodiment of the present invention, the lower and upper parts are two identical parts, which reduces the manufacturing cost.

Ad iv): According to the present invention, the strips used as the upper and lower part each have a conductor shape, which causes less stress on the hair when using the device according to the invention. The hair is in a device of the invention not on a flat surface, which could roughen it, but only selectively on the webs of the ladder shape, which are thus responsible for the shaping. In addition, the hair strand is pressed in connecting the upper and lower part of the device in no wave troughs, whereby it comes to any stretching of the hair. With the device according to the invention can be generated with significantly longer durability for all these reasons permanent waves.

By "ladder form" herein is meant primarily two longitudinally-corrugated longitudinal spars having a plurality of transverse rungs or spars distributed throughout the length, hereinafter referred to as "webs", between the spars. These webs can run at a right or at an acute angle to the spars and can each be at different angles. Preferably, the run Webs substantially parallel to each other and at right angles to the spars. The spars preferably also run substantially parallel to one another, but may also deviate from the parallel course, the maximum requirement for the above requirement of an aspect ratio of the strips of at least 3: 1. Particularly preferably, both the corrugated spars and the webs each extend parallel to each other, and the webs are at right angles to the spars, as understood in common usage under a "ladder". This in turn allows to use two identical components as the upper and lower part of the device according to the invention.

In contrast to a conventional ladder shape, however, in preferred embodiments of the invention, in addition, the ends of the longitudinal struts are connected to each other at both ends of the device by a respective end web. In the particularly preferred embodiment with parallel bars and webs, the shape of the device in a plan view thus corresponds to an elongated rectangle, which is subdivided by the webs into sections, so to speak, a one-piece "wall bars". More preferably, at least one of these end lands, preferably both, are inwardly, i. concave, curved or curved to adapt the device to the horizontal curvature of the head. The radius of curvature can vary according to the size of the head, i. special designs can be produced for (smaller) children and for adults.

As known in the art, in addition to their corrugation, the strips may also have a slight longitudinal curvature adapted to the vertical curvature of the head, again providing different radii of curvature in specific embodiments for (small) children and adults can be.

For purposes herein, "ladder shape" is also to be understood as embodiments in which, in addition to the two outer spars, one or more further longitudinal spars are interposed therebetween so as to increase the stability of the strips. Such additional longitudinal spars can be used especially for smaller aspect ratios. sen, such as 3: 1 or 4: 1, but relatively large length of the corrugated strips, for example 30 or 40 cm in length, be useful. In these cases, the length of the webs, for example, about 10 cm, which could lead to fractures of the webs in use. By providing additional longitudinal spars, the free length of the webs is shortened and reduces the risk of breakage. However, in these embodiments with reinforced conductor shape, the strips are not to be regarded as "grid", as defined in the prior art, so are no more or less closely meshed ("wire mesh"), but have, so to speak, the shape of a "multi-part wall bars" on. In order to preserve the hair treated by means of the device according to the invention even more, the webs preferably have a round or rounded cross-section, so that the strand of hair already resting on it at any point does not come into contact with any edges or corners. To prevent scalp injury, the ends of the longitudinal spars are preferably rounded, regardless of whether or not end bars are present.

In further preferred embodiments, the webs - optionally with the exception of the end webs - provided at regular intervals along the longitudinal spars to give the hair a uniform curl and make a certain orientation of the upper and lower part superfluous. However, in certain cases this may also be undesirable, e.g. if near the scalp a stronger corrugation is desired than towards the hair end.

In particularly preferred embodiments, the distances between the respective first webs (with the exception of the optional end webs) and the respective ends of the longitudinal beams are different from each other. This causes a relative displacement of the webs of the upper and lower parts to each other, especially when using two identical parts as the upper and lower parts in opposite directions, so that the hair is not squeezed between two webs. To ensure the uniform curl, the distances are the respective first webs (with the exception of the end webs) to the respective ends of the longitudinal beams 0.5 times or 1 times the regular distance between the webs. This means that if identical upper and lower parts are used in opposite directions, the webs are offset by exactly half the distance to each other.

The manner in which the two parts of the device according to the invention are to be connected in use is not particularly limited, so that any connection can be considered with which the two parts can be held together for the duration of the hair treatment. In principle, any clamps, clips or bands, e.g. around the two parts guided around elastic bands, but also adhesive bonds, either using an adhesive between the upper and lower part or an adhesive tape around both. However, it is preferred according to the invention for the lower part and / or the upper part to comprise or encompass at least one means for connecting the two parts to one another at least on one of the edges. These connecting means are or more preferably comprise a snap-action, folding or latching closure, as these are sometimes known from the prior art, but in particular a magnetic closure. For example, in the vicinity of one end of the strips on the outside of at least one of the (outer) longitudinal struts one projection each and at the same distance from the other end on the outside of at least the other (outer) longitudinal strut one respective recess adapted to the shape of the projection can be provided , When using identical parts as the upper and lower part in opposite orientation can ever such a projection are brought into engagement with a corresponding depression to hold the two parts together during the hair treatment, but then also easily be solved again.

In particular, the means for connecting the two parts comprise one or more magnetic closures, since in this way no pressure or tension has to be exerted on the device when connecting the parts, which could result in a painful pulling on the hair. As magnetic closures NEN each time when joining the two parts of the device for each two permanent magnetic plates or a respective magnetic plate, each with a plate of a ferromagnetic metal (iron, cobalt, nickel), an alloy thereof or ferrite, are made to coincide. In particularly preferred embodiments, a magnetic plate with an iron (alloy) plate will be made to coincide for cost reasons, the two plates preferably in specially provided holders or recesses on the edge or at the ends of the spars or the end webs can be accommodated.

Neither the dimensions nor the material of the device according to the invention are particularly limited as long as the requirement of the aspect ratio of the strips of at least 3: 1 is met. In the selection, attention should be paid to both the material consumption during production and the weight of the strips as well as their stability. Also, strips of different lengths may be produced to match the length of the hair to be corrugated, e.g. Strip with a length between about 15 and about 50 cm. The thickness of the spars and webs may for example be between 2 and 10 mm, wherein the at least three times longer spars preferably have greater thickness.

The connection of the spars and webs is also not limited, so that they are integrally formed, eg welded, or can be glued or screwed together, which of course depends on the choice of material. In general, every material comes into question, such as metals, plastics, ceramics or glass, or combinations of different materials. Preferably, the material is sufficiently inert to the chemicals used to make permanent waving and has sufficient breaking strength and elasticity to withstand even slight bending during use, as well as temperature resistance to withstand the temperatures prevailing during the drying of the hair. ie up to about 70 ° C, not to change, so not to soften or decompose. For these reasons, certain metals or metal alloys, for example aluminum, which has a passivating oxide layer on the surface, as well as plastics, in particular fiber-reinforced plastics, are preferred. With regard to cost, weight, stability and inertness, the lower and upper parts preferably consist entirely of chemically inert, more preferably glass-fiber reinforced, plastic (GRP), for example thermoplastic elastomers such as polypropylene or else crosslinked styrene-butadiene or ethylene-propylene-diene copolymers. The plastic can be molded, for example, by means of an injection molding process into one-piece strips for the device according to the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic representation of one of the two parts of a preferred embodiment of the present invention with curved end webs.

Fig. 2 is a schematic representation of one of the two parts of another preferred embodiment of the present invention with magnetic disk holders. Fig. 3 shows a pair of identical parts which can be made coincident with each other during use of the device.

DETAILED DESCRIPTION OF THE INVENTION

The non-restrictive example shown in FIG. 1 shows a particularly preferred embodiment of a strip in the form of a ladder serving both as upper and lower part of the device according to the invention. The strip consists of two along its length corrugated longitudinal beams 1, although substantially parallel to each other and communicate with each other via a plurality of cross rungs or webs 2. These run substantially at right angles to the bars 1 and are arranged at regular intervals c. How large this regular distance c of the webs depends on the other dimensions of the strips, since a smaller value causes a higher number of webs and thus a higher stability of the strip as a whole. For example, the value of c at an average total length of the strips of about 25 cm between see see 1 and 5 cm vary, depending on which material in which thickness for the spars 1 and the webs 2 is used.

At both ends of the strip, a respective end web 3a or 3b is provided, which connects the respective ends of the longitudinal members 1 with each other. The connection points at the ends of the spars 1 are rounded in order to prevent injuries to the scalp. In addition, the end webs are bent inwardly (concave) to conform their shape to the curvature of the head in a horizontal direction, with the curvatures of the end webs shown here overdrawn for purposes of illustration.

The distances a and b of the respective first webs (with the exception of the end webs 3a and 3b), ie the webs 2a and 2b to the ends of the longitudinal beams 1 are different. This prevents the meshing of two identical strips shown in FIG. 1 when the device is used, from causing their webs to cover one another so as not to squeeze a strand of hair inserted therebetween. For a given regular distance c between the individual webs, the following applies preferably: b = c and a = c / 2. This causes a strand of hair inserted into the device according to the invention to undergo a uniform curl. The embodiment of the invention shown in Fig. 2 has no curved, but linear end webs 3a, 3b, and the distances between the webs 2 are substantially the same over the entire length (the apparent differences between the distances a, b and c result from the perspective). In addition to Fig. 1, however, means 4 are provided for connecting the two parts of the device in the embodiment of Fig. 2, and - according to particularly preferred embodiments of the invention - two identical strips shown here. These means 4 are here as circular brackets with a likewise circular recess for insertion of appropriate Magnetbzw. Iron platelets (or platelets of another ferromagnetic material) are shown. These brackets are preferably integrally connected to the longitudinal beams 1, that is, welded or integrally molded, more preferably by injection molding, in particular fiber-reinforced - plastic, for example, polypropylene molded.

In this case, either one round permanent magnet chip can be inserted into each of the four holders, so that the connection between the two parts of four pairs of magnets is produced. Or it can be used in each case two magnetic and two iron plates, which each form a consisting of a magnetic and an iron plate pair when combining the two parts of the device according to the invention with their counterparts. In the latter case, the two same plates (magnetic or iron plates) can be used, either at the same end of the strip or diagonally offset. It is only decisive that the corresponding counterparts are found at the corresponding positions of the second strip, so that no two iron platelets coincide with each other.

Finally, Fig. 3 shows a pair of similar strips, as shown in Fig. 2, only with a smaller distance c between the webs 2. Here is good to see that it is at the lower and upper part to two identical parts, the Connect while the use of the device according to the invention can be gebacht each other for cover. Thus, for example, when producing the strips by means of injection molding, only a single mold is required, which considerably reduces the production costs.

Accordingly, the present invention provides a novel wavy-shaped hair shaping device which is inexpensive to produce and by means of which it is easier to produce permanent waves than in the prior art, which are of a more durable nature than heretofore.

Claims

1 . A device for wavy shaping of hair, comprising an elongated lower part, which has a plurality of waves in the longitudinal direction, for laying the hair, as well as an upper part for clamping the hair between the upper and lower part,

characterized in that:

i) the lower and upper parts are separated;

iv) have lower and upper part respectively ladder shape.

2. Device according to claim 1, characterized in that the aspect ratio of the corrugated strips is not more than 10: 1.

3. A device according to claim 1 or 2, characterized in that both the lower part and the upper part have a ladder shape consisting of two substantially parallel, corrugated longitudinal beams (1) and a plurality of Querspro- sen or -Stegen (2) ,

4. Device according to one of claims 1 to 3, characterized in that the webs (2) extend the conductor shape substantially at right angles to the longitudinal beams (1).

5. Device according to one of the preceding claims, characterized in that the webs (2) have a round or rounded cross-section.

6. Device according to one of the preceding claims, characterized in that the ends of the longitudinal bars (1) by in each case an end web (3a,

3b) are interconnected, of which at least one is inwardly curved.

7. Device according to one of the preceding claims, characterized in that the ends of the longitudinal bars (1) are rounded.

8. Device according to one of the preceding claims, characterized in that the webs (2) - optionally with the exception of the end webs

(3a, 3b) - are provided at regular intervals (c) along the longitudinal bars (1).

9. Apparatus according to claim 8, characterized in that the distances (a, b) between the respective first webs (2a, 2b) - with the exception of the end webs (3a, 3b) - and the respective ends of the longitudinal beams (1 ) differ from each other.

10. The device according to claim 9, characterized in that the distances (a, b) of the respective first webs (2a, 2b) - with the exception of the end webs (3a, 3b) - to the respective ends of the longitudinal beams (1) the 0, 5 times or the Ifache of the regular distance (c) between the webs (2) amount.

1 1. Device according to one of the preceding claims, characterized in that the lower part and / or the upper part comprise at least one of the edges at least one means (4) for connecting the two parts together.

12. The device according to claim 1 1, characterized in that the at least one connecting means (4) is a snap, folding, latching or magnetic closure.

13. Device according to one of the preceding claims, characterized in that lower and upper part made of plastic and / or light metal.

14. The apparatus according to claim 15, characterized in that the lower and upper parts consist entirely of chemically inert plastic.

15. Device according to one of the preceding claims, characterized in that the lower and upper parts are two identical parts.