# Patent

## Title
Hair straightening brush

## Abstract

A brush is provided herein, the brush having heating elements dispersed on and protruding from its face and spacers arranged to maintain a specified distance between protruding ends of the heating elements and a scalp of a head that is being brushed. The spacers are dispersed on the brush's face at a specified density that assures maintaining the specified distance with respect to a resilience of the spacers.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser. No. 14/975,783, filed Dec. 20, 2015, which was a continuation of U.S. patent application Ser. No. 14/401,540, filed Nov. 17, 2014, which was a U.S. national stage application of PCT International Application No. PCT/IL2013/050420, filed May 16, 2013, which was a continuation of PCT International Application No. PCT/IL2013/050017, filed Jan. 6, 2013, which claimed the benefit of Israel Patent Application No. 219875, filed May 17, 2012, all of which are incorporated herein by reference in their entireties.


BACKGROUND
1. Technical Field
The present invention relates to the field of hair heat treatment, and more particularly, to brush-like hair straighteners.
2. Discussion of Related Art
Hot combs have been used since the late 19th century, however operational considerations and safety requirements have been limiting their applicability.
BRIEF SUMMARY
One aspect of the present invention provides a brush comprising a plurality of heating elements protruding from a face of the brush, the heating elements dispersed on the brush's face at a specified density; and a plurality of spacers arranged to maintain a specified distance between protruding ends of the heating elements and a scalp of a head that is being brushed, the spacers dispersed on the brush's face at a specified density that assures maintaining the specified distance with respect to a resilience of the spacers.
These, additional, and/or other aspects and/or advantages of the present invention are set forth in the detailed description which follows; possibly inferable from the detailed description; and/or learnable by practice of the present invention.



BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding of embodiments of the invention and to show how the same may be carried into effect, reference will now be made, purely by way of example, to the accompanying drawings in which like numerals designate corresponding elements or sections throughout.
In the accompanying drawings:
FIGS. 1A-1C are high level schematic illustrations of a brush according to some embodiments of the invention;
FIGS. 2A-2C and 3A-3D are high level schematic illustrations of various arrangements of the heating elements and spacers of the brush according to some embodiments of the invention; and
FIG. 4 is a high level schematic flowchart illustrating a method according to some embodiments of the invention.



DETAILED DESCRIPTION
Prior to setting forth the detailed description, it may be helpful to set forth definitions of certain terms that will be used hereinafter.
The term “heating element” as used herein in this application refers to any type of heat conductive element, in particular metal (e.g. aluminum) heat conductors. Heating elements may have any shape, e.g. elongated, flat, conical, have a cross section that is round, elliptic or flat etc. Heating elements may have a cross section that varies in shape, and heating elements of varying forms may be combined on a single brush.
The term “spacer” as used herein in this application refers to any structure arranged to keep a clearance or a specified distance between heating elements of the brush and the scalp of the user's head. Spacers may have any form and may be positioned on the brush and/or on the heating elements. Spacers may be made of any material, preferable a heat insulating material. Different types of spacers may be used at different regions of the brush.
With specific reference now to the drawings in detail, it is stressed that the particulars shown are by way of example and for purposes of illustrative discussion of the preferred embodiments of the present invention only, and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the invention. In this regard, no attempt is made to show structural details of the invention in more detail than is necessary for a fundamental understanding of the invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice.
Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in the drawings. The invention is applicable to other embodiments or of being practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting.
FIGS. 1A-1C are high level schematic illustrations of a brush 100 according to some embodiments of the invention. FIG. 1A is a perspective view, FIG. 1B is a cross sectional view and FIG. 1C is a side view. FIGS. 2A-2C and 3A-3D are high level schematic illustrations of various arrangements of heating elements 120 and spacers 130 of brush 100 according to some embodiments of the invention. Brush 100 comprises heating elements 120 dispersed on and protruding from its face and spacers 130 arranged to maintain a specified distance between protruding ends of heating elements 110 and a scalp of a head that is being brushed. Spacers 130 are dispersed on the brush's face at a specified density that assures maintaining the specified distance with respect to a resilience of spacers 130.
FIGS. 1A and 1B illustrate flat, essentially one-sided brush 100, having a back 91, a handle 90, an operation button 95 and optionally an operation indicator and a heating level selector (not shown). In the cross sectional view of FIG. 1B, heat source 110 is visible, as well as the internal structure of elements in handle 90. FIG. 1C illustrates a cylindrical brush 100 having dispersed heating elements 120 and spacers 130. In these embodiments, some of spacers 130 may be connected on top (126) of some of heating elements 120 (130B) or among heating elements 120 (130C).
FIGS. 2A and 2B illustrate two configurations of heating elements 120 and spacer 130 on brush's face 92. FIG. 2A illustrates a dense arrangement of heating elements 120 and spacer 130 in which there is a high probability of each hair 80 contacting at least one heating element 120 and each hair 80 is likely to be extensively heated. FIG. 2B illustrates a less dense arrangement of heating elements 120 and spacers 130 in which heating elements 120 are spread apart in respect to FIG. 2A. As heating elements 120 are more remote from each other, there is a lower probability of each hair 80 contacting at least one heating element 120 and each hair 80 is likely to be heated more mildly than in the embodiment illustrated in FIG. 2A. In general, the configuration of heating elements 120 and spacers 130 is selected according to operative and safety requirements to provide an effective and safe brush.
Brush 100 comprises a plurality of heating elements 120 protruding from a face 92 of brush 100. Heating elements 120 may be elongated with any shape of cross section (e.g. round in FIG. 2A, elliptic in FIG. 1A, variable in FIG. 3A etc.). Heating elements 120 are made of heat conductive material, as a non-limiting example, aluminum. In embodiments, the heat conductive material may have a thermal conductivity which is comparable to high quality aluminum (over 200 W/m° K), lower conductivity of 50-200 W/m° K or even low thermal conductivity between 20-50 W/m° K. The thermal conductivity may be selected with respect to overall efficiency and safety requirements.
Heating elements 120 conduct heat from a heat source 110 such as a heating body, which may receive energy from a battery in brush 100 or from an external source. Good thermal contact may be established between heat source 110 and heating elements 120, e.g. using a thermal paste, or by constructing heat source 110 and heating elements 120 as a single body. In embodiments, heating elements 120 may comprise internal heat sources (not shown) such as small resistors to improve the heating efficiency. The internal heat sources may replace or enhance a central heat source. In embodiments, heating elements 120 may comprise electrical heating wires. Brush 100 may further comprise a control unit 111 arranged to control heating elements 120 and/or heat source 110. Control unit 111 may be positioned in handle 90 of brush 100.
Heating elements 120 may reach temperature between 140-240° C., which are useful for straightening hair. Heating elements 120 may be arranged and constructed to minimize hair damages during the straightening process, e.g. avoid scratching the hair, avoid excessive stretching of the hair, avoid scalp injuries etc.
Heating by heating elements may be carried out in all directions or in specified directions (see e.g. direction 122 in FIGS. 2A and 2B) in cooperation with the arrangement of heating elements 120 on the brush's face. Brush 100 thus provides three dimensional heating of the hair. The spacer configuration ensures a safe and efficient straightening effect.
Brush face 92 may comprise a heat source connected to heating elements 120. Heating elements 120 are dispersed on at least a part of brush's face 92 at a specified density. The specified density may vary between different regions of face 92, as explained below. Heating elements 120 provide a large heating surface area for straightening hairs. For example, while a surface of a heat may be 40 cm2 (generally between 10-80 cm2, depending on the brush size), the overall surface of heating elements 120 may be twenty-fold, or between 5 and 70 times the area of face 92. Such increase in the contacting surface area increases the efficiency of heat delivery to the hair.
Protruding ends 125 of heating elements 120 may be smooth or rounded to prevent accidental injury, protect the hair, allow easy brushing of the hair and ensure uniform heat delivery.
Brush 100 further comprises a plurality of spacers 130 arranged to maintain a specified distance or a clearance between protruding ends 125 of heating elements 120 and a scalp of a head that is being brushed (see below, FIG. 3A). Spacers 130 may have any form and may be positioned on brush 100, on heating elements 120, among heating elements 120 (see e.g. 130C in FIG. 3C) or in a combination thereof (see e.g. FIG. 1A, where different types of spacers 130 are used at different regions of brush 100). Spacers 130 located on the brush's face 92 are marked 130A, spacers 130 located on top of heating elements 120 are marked 130B and spacers 130 located among the heating elements 120 are marked 130C. In embodiments, some or all of heating elements 120 may be surrounded by spacers 130.
Spacers 130 may be made of any material, preferable a heat insulating material, e.g. plastic or silicon. In embodiments, the heat insulating material may have a thermal conductivity which is lower than 10 W/m° K.
For example, spacers 130 may comprise flexible bristles arranged to protect the scalp from a temperature of heating elements reaching 140° C. or more.
Spacers 130 are dispersed on brush 100's face 92 at a specified density that assures maintaining the specified distance with respect to a resilience of spacers 130, as explained below.
In a non-limiting example, heating elements 120 may be 3 mm-50 mm high, and may vary in height across face 92. Spacers 130 may be higher than adjacent heating elements 120 by 1 mm-30 mm depending on their density (and the intervals between adjacent spacers 130), resilience, density and dimensions of heating elements 120 and application scenarios (e.g. type and length of hair, applies heat, user sensitivity etc.). The distribution and forms of spacers 130 may be adapted to the distribution of heating elements 120 (e.g. a region with taller or denser heating elements 120 may have taller or denser spacers 130). The distribution of heating elements 120 may also be adapted to application scenarios, e.g. denser hair may be treated with longer and possibly less dense heating elements 120 (e.g. 25 mm long) while thinner hair may be treated with shorter and possibly denser heating elements 120 (e.g. 10 mm long).
FIG. 3C illustrates the relation between the resilience of spacers 130 and the height difference between spacers 130 and heating elements 120. Spacers 130C are illustrated in their upright position (hatched) and in a bent position during application of brush 100. Additional spacer types (130A, 130B) may also be present in this configuration (not shown). The height difference may be large enough to provide a safety distance to scalp 85 even in the most aggressive application scenario, or the height difference and spacer resilience may be configured to assure safe application in normal or other scenarios.
In embodiments, the specified densities of heating elements 120 and of spacers 130 may be variable across the face of brush 100 and be related to maintain the specified distance between protruding ends 125 of heating elements 120 and scalp 85 under at least one usage scenario.
As illustrated in FIGS. 2C, 3A and 3B, spacers 130A and/or 130C may protect the sides of brush 100 while spacers 130B may be connected on top (126) of some or all of heating elements 120 (see FIGS. 3A, 3D). Some of heating elements 120 may be lower than other heating elements 120 and some of heating elements 120 may hold spacers 130B attached to their tops 126. In embodiments, spacers 130 may be connected to sides of heating elements 120. In embodiments, heating elements 120 may vary in shape and size across face 92 (FIGS. 3A, 3D) and spacers 130 may be designed accordingly to enhance safety. Face 92 may be bended to further increase the effective heat application area (see FIG. 2C).
One non-limiting example for brush 100 is illustrated in FIGS. 3A and 3B. In this example, brush face 92 is 55 mm×85 mm. Connected to face 92 are heating elements 120B which are 12 mm high and heating elements 120A which are 8 mm high and have spacers 130 which are 16 mm high connected on top. The specified distance which is kept between heating elements 120 and scalp 85 in an non-bended state of spacers 130 is hence 4 mm. Spacers 130 may be short and stiff bristles which do not bend mush during application, to maintain the specified safety distance quite constant. In an example, brush 100 uses 500 W and provides a heated area of 520 cm2.
In embodiments, the specified distance between heating elements and scalp 85 may be between 1 and 30 mm.
Another non-limiting example for brush 100 is illustrated in FIG. 3D. In this example, all heating elements 120 are protected with soft silicon spacers 130, which may extend also to sides of heating elements 120 (not shown). In an example illustrated in FIG. 3A, some of heating elements 120 may comprise spacers 130 as caps 130B and others as bristles 130B.
Another non-limiting example for brush 100 is illustrated in FIG. 3C. In this example, resilient spacers 130C both protect scalp 85 and provide a pleasant feel while using brush 100, due to their bending upon contacting scalp 85.
In embodiments, spacers 130 may be positioned on any of brush face (130C), brush face periphery (130A in FIG. 1A) or on top of heating elements 120 (130B). Different spacers 130 may be arranged to provide scalp protection under different usage scenarios. For example, some spacers 130 may be stiffer to protect the scalp during forceful brushing and other spacers 130 may by compliant to provide protection as well as a pleasant feel during smooth brushing.
In embodiments, the specified density of heating elements 120 may be between 0.2 and 15 per cm2. For example, heating elements 120 may be 3 mm wide (at their base) and 1-2 mm apart. In embodiments, heating elements 120 may be 4-5 mm apart (measured between base centers of heating elements 110). In another example heating elements 120 may be 20 mm wide and 10 mm apart. Intermediate examples may be selected according to the required application.
FIG. 4 is a high level schematic flowchart illustrating a method according to some embodiments of the invention.
Method 200 comprises arranging spacers to maintain a specified distance between protruding ends of heating elements and a brushed scalp (stage 210), dispersing the spacers at a specified density selected to assure maintaining the specified distance with respect to a resilience of the spacers (stage 220) and thereby safely and efficiently straightening hair using three dimensional heating and spacer protection (stage 230). In embodiments, method 200 further comprises connecting at least some of the spacers on top of corresponding heating elements (stage 225) and generally arranging the spacers in a way that keeps the heating elements at a safety distance from the scalp under any usages scenario.
In the above description, an embodiment is an example or implementation of the invention. The various appearances of “one embodiment”, “an embodiment” or “some embodiments” do not necessarily all refer to the same embodiments.
Although various features of the invention may be described in the context of a single embodiment, the features may also be provided separately or in any suitable combination. Conversely, although the invention may be described herein in the context of separate embodiments for clarity, the invention may also be implemented in a single embodiment.
Embodiments of the invention may include features from different embodiments disclosed above, and embodiments may incorporate elements from other embodiments disclosed above. The disclosure of elements of the invention in the context of a specific embodiment is not to be taken as limiting their used in the specific embodiment alone.
Furthermore, it is to be understood that the invention can be carried out or practiced in various ways and that the invention can be implemented in embodiments other than the ones outlined in the description above.
The invention is not limited to those diagrams or to the corresponding descriptions. For example, flow need not move through each illustrated box or state, or in exactly the same order as illustrated and described.
Meanings of technical and scientific terms used herein are to be commonly understood as by one of ordinary skill in the art to which the invention belongs, unless otherwise defined.
While the invention has been described with respect to a limited number of embodiments, these should not be construed as limitations on the scope of the invention, but rather as exemplifications of some of the preferred embodiments. Other possible variations, modifications, and applications are also within the scope of the invention. Accordingly, the scope of the invention should not be limited by what has thus far been described, but by the appended claims and their legal equivalents.

## Claims

1. A hairbrush, comprising:
a heating plate;
a plurality of elongate heating elements monolithic with and protruding from the heating plate, said heating plate having a longitudinal axis disposed between two opposite sides thereof, said plurality of elongate heating elements arranged in a plurality of rows parallel to said longitudinal axis so that each of said plurality of rows comprises a number of the plurality of elongate heating elements;
a plurality of heat insulating spacers, each of said plurality of heat insulating spacers projecting from an elongate bore of a respective one of said plurality of elongate heating elements, wherein said elongate bore of said respective one of said plurality of elongate heating elements completely surrounds a peripheral portion of a respective one of said plurality of heating insulating spacers projecting therefrom; and
a plurality of heat insulating elongate peripheral spacers disposed at least along said two opposite sides.

2. The hairbrush of claim 1, wherein a number of said plurality of heat insulating elongate peripheral spacers at one of said two opposite sides is equal to a number of said plurality of heat insulating elongate peripheral spacers at another one of said two opposite sides.

3. The hairbrush of claim 1, wherein said heat insulating elongate peripheral spacers at one of said two opposite sides and said heat insulating elongate peripheral spacers at another one of said two opposite sides are symmetrical with respect to said longitudinal axis.

4. The hairbrush of claim 1, wherein, for each of the plurality of rows, the elongate heating elements thereof are offset relative to the elongate heating elements in an adjacent one of the plurality of rows.

5. The hairbrush of claim 1, wherein the plurality of elongate heating elements are equally spaced along said longitudinal axis.

6. The hairbrush of claim 1, wherein the plurality of elongate heating elements are arranged in a pattern resulting in a plurality of parallel undulating paths at least in a direction transverse to said longitudinal axis.

7. The hairbrush of claim 6, wherein the plurality of undulating paths are substantially parallel to each other.

8. The hairbrush of claim 1, wherein said plurality of heat insulating elongate peripheral spacers are disposed around substantially an entirety of the heating plate including all of said plurality of elongate heating elements.

9. The hairbrush of claim 1, wherein each of the plurality of elongate heating elements is equally spaced from an adjacent one of plurality of elongate heating elements.

10. The hairbrush of claim 1, wherein said hairbrush is configured as a one-sided hairbrush.