Hair brush
By designing brushes with movable internal and external bristle rows, existing brushes are solved by solving the problem that existing brushes are difficult to adapt to different hair types and styling techniques, achieving adaptability and safety, and reducing damage to hair.
Patent Information
- Application Number
- CN202380079953.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-11-29
- Filing Date
- 2023-11-20
- Publication Date
- 2025-06-20
AI Technical Summary
Existing brushes are difficult to adapt to different hair types and styling techniques in hair styling and are prone to damage to the hair when tension is applied.
A brush is designed that includes longitudinally extending inner and outer bristle rows, which are longitudinally moved by an actuator relative to the outer bristle row, thereby increasing friction and tension, and controlling the magnitude of tension by an adjustable limiter.
The brush is able to adapt to different hair types and styling techniques, increases friction and tension to the hair, reduces damage to the hair, and allows the user to adjust the tension flexibly.
Smart Images
Figure CN120187325A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a brush for hair styling. Background Art
[0002] Brushes are well-known hair styling tools. Generally, a hairbrush includes a handle, a bristle bed mounted to the handle, and a plurality of bristles extending from the bristle bed. In use, the brush is held so that the bristles penetrate a bundle of hair, and then moved along the bundle of hair so that the bristles pass between the hair strands.
[0003] It will be appreciated that when the user moves the brush in this way, tension can be applied to the hair due to the friction between the bristles of the brush and the hair passing between the bristles. In some cases, this tension is desirable and can be used for hair styling. For example, when combined with heat and / or moisture (e.g., via a hair dryer), applying tension facilitates straightening the hair bundle.
[0004] However, different styling techniques benefit from different amounts of tension applied to the hair. In addition, the moisture in the hair being styled affects the optimal amount of tension for achieving effective styling (e.g., generally lower tension is optimal for wet hair, while higher tension is optimal for dry hair). Similarly, the tension applied to the hair by a given brush will vary depending on the characteristics of the hair being styled (e.g., hair type, thickness, etc.). This means that a single brush may not be suitable for a range of users with different hair types, and / or may not be suitable for a range of styling techniques.
[0005] In view of the above considerations, the present disclosure has been designed. Summary of the Invention
[0006] In a first aspect, there is provided a brush for hair styling, the brush comprising:
[0007] A bristle bed;
[0008] A plurality of bristles, each bristle projecting from the bristle bed to a respective free end, the bristles being arranged to form one or more longitudinally extending inner bristle rows disposed between two longitudinally extending outer bristle rows; and
[0009] An actuator that can be actuated to move one or more of the inner bristle rows and / or the outer bristle rows in a longitudinal direction to provide relative longitudinal movement between one or more of the inner bristle rows and the two outer bristle rows;
[0010] Wherein each bristle row has a bristle spacing distance defined as the longitudinal distance between a pair of adjacent bristles of the row, and the actuator is configured such that when actuated, the distance of the relative longitudinal movement of one or more of the inner rows and the two outer rows is greater than the bristle spacing distance of at least one row.
[0011] In use, the brush is positioned such that the bristles penetrate the user's hair and the hair strands extend between the bristles. The user can actuate the actuator to longitudinally move one or more of the inner bristle rows relative to the outer bristles. Doing so causes the hair strands between the bristles to be pulled by the inner bristle rows, thereby forming a lateral (substantially perpendicular to the longitudinal direction) meandering / zigzag path across the bristle bed. In turn, this increases the friction between the hair strands and the bristles, so that when the brush is moved along the hair (e.g., in a direction away from the user's scalp), tension can be applied to the hair.
[0012] Advantageously, increasing the friction and tension in this way is less damaging to the user's hair than, for example, clamping the hair (which can damage the hair due to the application of a large force over a minimal area).
[0013] Furthermore, it should be understood that movement of the bristles in the opposite longitudinal direction (returning them to their original position) reduces the tension and allows the user to vary the tension for styling and to more easily remove the brush from their hair. Also, the ability to release the tension can prevent the hair from getting caught in the bristles, which could potentially damage the user's hair.
[0014] For the avoidance of doubt, the bristle spacing is the minimum distance between two bristles. However, in other embodiments, the spacing distance can be the distance between the centers of two bristles (i.e., the distance between the central axes of the bristles).
[0015] Optional features of the first aspect will now be described. These can be used alone or in combination with any aspect.
[0016] In some embodiments, one or more of the inner rows can be static (and the outer row can be longitudinally movable). In other embodiments, the outer row can be static (and one or more of the inner rows can be longitudinally movable). In another embodiment, neither the inner row nor the outer row is static. Instead, in such an embodiment, both the inner row and the outer row can be longitudinally movable, but at different speeds relative to each other (i.e., so as to provide relative movement).
[0017] As described above, the longitudinal movement distance is greater than the bristle spacing of at least one row. Thus, for example, the longitudinal movement distance can be greater than the bristle spacing of one or two outer rows. Alternatively or additionally, the longitudinal movement distance can be greater than the bristle spacing of at least one row in one or more of the inner rows.
[0018] The brush may include more than three rows of longitudinally extending bristles. For example, the brush may include exactly seven rows of longitudinally extending bristles. The brush may include exactly five rows of longitudinally extending bristles. Using relative movement of the bristles to provide tension may allow the brush to have fewer rows of longitudinally extending bristles (to provide the same tension) than a brush that does not include longitudinally movable bristles.
[0019] The rows of bristles may be substantially parallel to each other.
[0020] The lateral spacing between the rows of bristles may be sufficient to allow hair to pass between them (e.g., when being pulled due to relative movement of the rows of bristles). For example, the lateral spacing between one or more inner rows of bristles and two outer rows of bristles may be greater than 0.5 mm, or greater than, for example, 1 mm, or greater than, for example, 2 mm.
[0021] The bristle bed may include one or more fixed portions. The bristle bed may include a movable portion. In some embodiments, two outer rows of bristles may be fixed to one or more fixed portions, while the inner rows of bristles may be fixed to the movable portion. In other embodiments, the inner rows of bristles may be fixed to the fixed portion and two outer rows of bristles may be fixed to the movable portion.
[0022] The actuator may be operatively connected to the movable portion such that when actuated, the movable portion moves (e.g., slides) in the longitudinal direction from a first position to a second position. For example, the actuator may include a button or a trigger that can be pressed to move the movable portion in the longitudinal direction.
[0023] The brush may include a handle (e.g., a cylindrical handle). The handle may extend longitudinally from the bristle bed (the handle may be longitudinally elongated). The bristle bed may form part of the brush head and the handle may extend from the brush head. The head (brush head) of the brush may be longitudinally elongated.
[0024] The central (longitudinal) axis of the handle (or at least most of the length of the handle) may be offset from the central axis of the brush head. For example, the central axis of the handle may be offset in the direction in which the bristles extend from the bristle bed. Thus, the handle may include a bend at the end adjacent to the bristle bed. The actuator may be provided on or near the bend.
[0025] The actuator (e.g., including a button or a trigger) may be provided at the end of the handle near the bristle bed (and the brush head). This may allow the user to actuate the actuator with their thumb while holding the handle.
[0026] The actuator can be disposed on one side of the brush where the bristles project. In other embodiments, the actuator can be disposed on the side of the brush opposite to the side where the bristles project. The actuator can be configured such that actuation of the actuator includes inward movement of the actuator towards the central axis of the handle.
[0027] The movement of the movable part from the first position to the second position can be a movement in a direction away from the handle (and thus away from the user's hand in use). In other embodiments, the movement of the movable part from the first position to the second position can be a movement in a direction towards the handle (i.e., towards the user's hand when holding the brush in normal use).
[0028] Each bristle of each outer row can be laterally aligned with another outer bristle row (e.g., forming laterally aligned outer bristle pairs). In the first position, one or more bristles of the inner row or each inner row can be laterally aligned with each outer bristle row. In other words, the bristles can be arranged such that in the first position, they define a gap / channel extending laterally through the bristle bed for receiving a hair bundle.
[0029] The movable part can include a slidably mounted rack, and the actuator can include a pivotally mounted gear. The gear can engage with the rack such that actuation of the actuator (e.g., pressing a button or a trigger) causes longitudinal movement of the rack. For example, each rack and gear can include meshing teeth such that actuation of the actuator can longitudinally slide the rack.
[0030] The brush can include a biasing device configured to bias the movable part to the first position. The biasing device can include a compression spring. The compression spring can extend between the movable part and a fixed part (e.g., a stop element forming part of the fixed part).
[0031] The brush can include a limiter configured to limit the extent of relative movement between the inner row and the two outer rows in response to actuation of the actuator. That is, the limiter can limit the total stroke of the inner row (or outer row) in response to a single (full) actuation of the actuator. In effect, this can limit the tension applied by the brush when the user fully actuates the actuator (e.g., fully presses a button or a trigger).
[0032] The limiter can be adjustable to vary the extent of relative movement between the inner row and the two outer rows in response to actuation of the actuator (e.g., full actuation). When the movable part is in the first position, the limiter can abut against the movable part. The longitudinal position of the limiter is adjustable to adjust the first position of the movable part.
[0033] The bristles can be substantially rigid. The bristles can be flexible (e.g., more flexible than the bristle bed, the brush head, and / or the handle). The bristles can be made of plastic or metal.
[0034] Each bristle may include a smooth (without any abrupt discontinuities) outer circumferential surface, which may be free of dividing lines (i.e., protruding lines formed during some manufacturing processes). This can avoid or reduce any damage to the hair caused by tension exerted on the hair due to the movement of the bristle rows.
[0035] In some embodiments, at least some bristles may include dividing lines, but the dividing lines may be positioned such that they do not contact the hair when the actuator is actuated. Thus, for example, the dividing lines may be provided on the area of each bristle that follows the movement during use (i.e., when longitudinally moved by actuation of the actuator).
[0036] In some embodiments, the width (in the transverse direction) of the cross-sectional shape of each bristle of at least one row of bristles (such as the inner row) is greater than the thickness (in the longitudinal direction). The cross-sectional shape may be, for example, oval, rectangular, oblong, etc.
[0037] The respective free ends of the bristles may be arranged such that a reference surface intersecting the free ends is concave. That is, the tips of the bristles may together form a concave shape. The reference surface may be concave along two orthogonal axes. In use, when the brush is moved along the user's hair, the free ends of the bristles may contact the user's head. Configuring the bristles such that their free ends form a concave shape can provide a more comfortable experience for the user, as the free ends can better conform to the shape of the user's head.
[0038] Each bristle may be mounted to the bristle bed by an elastic mounting element (such as formed of rubber). This can allow the bristles to move when contacting the user's head, thus allowing some conformity to the shape of the user's head (i.e., providing a more comfortable use).
[0039] At least some bristles may be heated bristles. For example, the brush may include a heater configured to heat at least some bristles. The heater may be configured to heat at least one of the inner and outer bristle rows. The heater may be configured to heat the static bristle row. The heated bristles may be formed of a thermally conductive material (such as metal). The heater may be in thermal communication with the heated bristles. The brush may include a power source for powering the heater. For example, the power source may be a battery. The battery may be provided in the handle.
[0040] The brush may include heated bristles (as described above) and unheated bristles. Each heated bristle may have a larger cross-sectional area than each unheated bristle. The length of each heated bristle (i.e., the length in the direction extending from the bristle bed) may be shorter than that of each unheated bristle.
[0041] In some embodiments (in addition to, or instead of, heated bristles), the brush may include an outlet configured to direct hot air onto the hair passing between the bristles. The outlet may be in fluid communication with a heater (such as the heater discussed above).
[0042] In a second aspect, there is provided a brush for styling hair, the brush comprising:
[0043] a bristle bed;
[0044] a plurality of bristles, each bristle projecting from the bristle bed to a respective free end, the bristles being arranged to form one or more longitudinally extending inner bristle rows disposed between two longitudinally extending outer bristle rows; and
[0045] an actuator actuable to move one or more of the inner bristle rows and / or the outer bristles in a longitudinal direction between:
[0046] a first position in which each bristle of the inner bristle row is located on a first longitudinal side of one of the respective outer bristle rows;
[0047] a second position in which each bristle of the inner bristle row is located on a second longitudinal side of the respective bristle, opposite the first longitudinal side.
[0048] In other words, the actuator is actuable to move each inner bristle to and past the respective outer bristle. As described above, this forms a C-shape or a W-shape, or a zigzag / snake shape in the hair bundle and allows tension to be applied to the hair.
[0049] The brush of the second aspect may optionally include one or more features of the brush described above with respect to the second aspect (i.e., include one or more of the optional features described above). BRIEF DESCRIPTION OF THE DRAWINGS
[0050] Embodiments will now be discussed with reference to the drawings, in which:
[0051] Figure 1 is a perspective view of a brush for styling hair;
[0052] Figure 2A and 2B is a schematic top view showing the movement of the bristles of the brush of Figure 1 ;
[0053] Figure 3 is Figure 1 a side sectional view of the brush in
[0054] Figure 4 is Figure 1 a top view of the brush in
[0055] Figure 5 Yes Figure 1 Side view of a part of a variant of the brush;
[0056] Figure 6 Shows Figure 1 Side view of a variant of the actuator of the brush;
[0057] Figure 7 Illustrates Figure 1 Cross-sectional view of an example of how the bristles of the brush are mounted to the bristle bed;
[0058] Figure 8 Shows a side view of the bristles arranged in an alternative Figure 1 way; and
[0059] Figure 9 Shows Figure 1 Schematic top view of a variant of the bristles of the brush, some of which are heated. Detailed Description
[0060] Aspects and embodiments will now be discussed with reference to the accompanying drawings. Further aspects and embodiments will be apparent to those skilled in the art.
[0061] Figure 1 , 3 and 4 show a brush 10, which includes an elongated cylindrical handle 11 that is mounted to a bristle bed 12, and the bristle bed 12 forms part of the head 29 of the brush 10. A plurality of bristles 13 project from the bristle bed 12. In particular, each bristle 13 projects from a proximal end 14 adjacent to the bristle bed 12 to a respective free end 15 (away from the bristle bed 12).
[0062] The bristles 13 are arranged to form 11 longitudinally extending rows 16, 17 of bristles 13. In particular, the brush 10 includes five movable rows 16 (the movement of which will be described in further detail below), and the five movable rows 16 are arranged in an alternating manner with six static rows 17. Each movable row 16 of bristles 13 can be considered an inner row 16 of bristles 13 disposed between two outer (static) rows 17 of bristles 13.
[0063] To effect the movement of the movable rows 16, the brush 10 includes an actuator 22, which includes a button 18 that is disposed at one end of the handle 11 near the bristle bed 12. When the button 18 is pressed, the movable rows 16 of bristles 13 move relative to the static rows 17 in a longitudinal direction, moving along longitudinally extending tracks 20 (in the form of slots) formed in the bristle bed 12. This movement is best illustrated with reference to Figure 2A and 2B .
[0064] Figure 2Aand 2B schematically depicts a portion of three rows 16, 17 of bristles 13. Two of these rows 16, 17 are static (outer) rows 17 and the other row is a movable (inner) row 16 located between the static rows 17. In Figure 2A , the button 18 is in its first position, which is its resting position (i.e., not pressed). In this position, the bristles 13 of each row 16, 17 are laterally aligned with the corresponding bristles 13 of the other rows 16, 17 (although this may not be the case in other embodiments). Thus, a laterally extending channel is formed in which a laterally extending hair bundle 19 can be received.
[0065] In Figure 2B , the button 18 is in its second position, in which it has been pressed by the user. Pressing the button causes the movable row 16 of bristles 13 to move longitudinally relative to the static rows 17 by a distance M. This distance M is greater than the bristle spacing S between adjacent bristles 13 of a given bristle row 16, 17. From Figure 2B it can be seen that one result of this movement is that the hair received between the bristles 13 is pulled into a "C" shape around the bristles 13 of the movable row 16. That is, each hair bundle is forced to pass through the bristles 13 along a tortuous path. When the brush 10 is moved along the hair, this increases the tension applied to the hair. It will be appreciated that the greater the distance M, the greater the tension applied to the hair by the bristles 13. In this way, the user can control the magnitude of the tension applied to the hair, which increases the versatility of the brush 10 (e.g., allowing the brush 10 to effectively handle different hair types and / or allowing the use of more styling techniques).
[0066] In particular, Figure 3 shows how the movement of the movable row 16 is achieved. It can be clearly seen from this figure that each movable row 16 of bristles 13 is mounted on a movable part 21 of the brush 10. The movable part 21 is slidably mounted within the brush 10 and includes a rack 23 provided at an end of the movable part 21 opposite the end from which the bristles 13 project. The rack 23 includes teeth 24 which engage corresponding teeth 25 provided on a gear 26 of an actuator 22. The gear 26 is pivotally mounted to the handle 11 such that when the button 18 is pressed by the user, the teeth 25 of the gear 26 engage the teeth 24 of the rack 23 to move the movable part 21 (and the movable row 16) in the longitudinal direction (towards the end of the bristle bed 12 remote from the handle 11).
[0067] The brush 10 further includes a biasing device 27 in the form of a compression spring. A first end of the biasing device 27 abuts the movable part 21, while an opposite second end of the biasing device 27 abuts a stop surface 28 forming part of the head 29 of the brush 10 (defining a fixed part of the static row 17 mounting the bristles 13). When the user presses the button 18 and the movable part 21 moves from the first position to the second position, the biasing device 27 is compressed from its natural state. The biasing of the biasing device 27 causes it to urge the stop surface 28 and the movable part 21 apart, thereby urging the movable part 21 to return to the first position. Thus, when the user releases the button 18 during use, the movable part 21 returns to the first position (under the force of the biasing device), and the button 18 returns to its unpressed position.
[0068] The brush 10 further includes a limiter 30 configured to limit the extent of movement of the movable part 21. The limiter 30 includes an elongate body 31 that is threadedly engaged with a rotatable adjustment wheel 32 provided at one end of the handle 11. The elongate body 31 extends from the adjustment wheel towards the head 29 of the brush 10 into the handle 11. When the movable part 21 is in the first position (when the button 18 is not pressed), the proximal end (the end closest to the head 29 of the brush 10) of the elongate body 31 abuts the movable part 21, preventing the movable part 21 from moving further towards the handle 11. In other words, when the button 18 is not pressed, the limiter 30 sets the position of the movable part 21.
[0069] The threaded engagement between the adjustment wheel 32 and the elongate body 31 causes the elongate body 31 of the limiter 30 to move away from or towards the movable part 21 when the wheel 32 is rotated (about the longitudinal axis). Thus, the limiter 30 is adjustable to adjust the position of the movable part 21 when the button 18 is not pressed. Therefore, the adjustment of the limiter 31 changes the total distance that the movable part 21 moves in response to a single full press of the button 18. This is beneficial for users who wish to customize the amount of tension applied (in the case of a full press of the button 18) for a particular styling and / or a particular hair type.
[0070] Figures 5 to 9 is shown Figures 1 to 4 a variant of the above-described embodiment. In Figure 5 this case, the button 18 is of a different type from that of the foregoing embodiment. In particular, the button 18 is slidably mounted to the handle 11 (rather than pivotally mounted). Additionally, the handle 11 includes a bend (where the button 18 is located) such that the central axis of the portion forming most of the length of the handle 11 is offset from the central axis of the head 29 of the brush 10. The direction of offset of the handle portion is the same as the direction in which the bristles 13 extend from the bristle bed 12.
[0071] Figure 6 Another variant of the actuator is shown, in which case the variant includes a button 18, which is located on the side of the brush 10 opposite to the bristle bed 12. According to the previous embodiment, the button 18 is provided at one end of the handle 11 close to the bristle bed 12 (and the head 29 of the brush 10).
[0072] Figure 7 How the bristles 13 are mounted to the bristle bed 12 is shown. In particular, the resilient mounting elements 33 mount each bristle 13 to the bristle bed 12 such that each bristle 13 can move relative to the bristle bed 12 (in a direction parallel to the bristle length). This helps to allow the bristles 13 to conform to the user's head during use (e.g., this may be difficult to implement in combination with movable bristles without a flexible bristle bed).
[0073] Figure 8 Another way of providing bristles 13 that conform to the user's head is shown. In this variant, the bristles 13 are arranged such that their free ends 15 form a concave shape (i.e., defining a concave reference surface, represented by the dashed line). It will be understood that the concave shape can be provided along a single axis (e.g., longitudinal or transverse), or can be provided along two orthogonal axes (e.g., longitudinal and transverse directions).
[0074] Figure 9 A variant is schematically shown in which two static rows 17 of bristles 13' are heated bristles, which are heated by a heater (not shown) forming part of the brush 10. The heater can be an electric heater powered by a battery provided in the handle 11. The heated bristles 13' can be formed of a heat-conducting material (such as metal) and can be in thermal communication with the heater. As Figure 9 shown, the cross-sectional area of the heated bristles 13' is larger than that of the unheated bristles 13 and they are spaced further apart than the unheated bristles 13. Although not apparent from Figure 9 it, the heated bristles 13' can also be shorter than the unheated bristles 13. This can ensure that the heated bristles 13' do not contact the user's head during use.
[0075] The above exemplary embodiments are considered to be illustrative rather than restrictive. Various changes can be made to the described arrangements without departing from the spirit and scope of the invention.
[0076] For example, in the above embodiment, the brush includes seven longitudinally extending rows of bristles. In other embodiments, the brush can include fewer longitudinally extending rows of bristles (e.g., three rows or five rows).
[0077] To avoid any doubt, any theoretical explanations provided herein are for the purpose of enhancing the reader's understanding. The inventors do not wish to be bound by any of these theoretical explanations.
[0078] Any chapter headings used in this document are for organizational purposes only and should not be construed as limiting the subject matter described.
[0079] Throughout the specification, including the claims which follow, unless the context requires otherwise, the words "comprise" and "include", and variations such as "comprising" and "including", will be understood to imply the inclusion of the stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
[0080] It must be noted that, as used in the specification and the appended claims, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. Ranges may be expressed herein as from "about" one particular value, and / or to "about" another particular value. When such a range is expressed, another embodiment includes from one particular value and / or to another particular value. Similarly, when values are expressed as approximations by use of the antecedent "about", it will be understood that the particular value forms another embodiment. The term "about" associated with a numerical value is optional and means, for example, + / - 10%.
Claims
1. A brush for hair styling, the brush comprising: Brush bed; A plurality of bristles, each bristle protruding from the brush bed to a respective free end, the bristles being arranged to form one or more longitudinally extending inner bristle rows disposed between two longitudinally extending outer bristle rows; and An actuator capable of being actuated to move one or more of the inner bristle rows and / or the outer bristle rows in a longitudinal direction to provide relative longitudinal movement between one or more of the inner bristle rows and the two outer bristle rows; Wherein each bristle row has a bristle spacing distance defined as the longitudinal distance between a pair of adjacent bristles of the row, and the actuator is configured such that when actuated, the distance of relative longitudinal movement of one or more of the inner rows and the two outer rows is greater than the bristle spacing distance of at least one row.
2. The brush according to claim 1, wherein the inner row is static, or the two outer rows are static.
3. The brush according to claim 1 or 2, wherein the bristle bed comprises a longitudinally movable part and one or more fixed parts, and wherein: The two outer bristle rows are fixed to one or more fixed parts, and the inner bristle rows are fixed to a movable part; or One or more of the inner bristle rows are fixed to one or more fixed parts, and the two outer bristle rows are fixed to a movable part.
4. The brush according to claim 3, wherein the actuator is operatively connected to the movable part such that when the actuator is actuated, the movable part moves in a longitudinal direction from a first position to a second position.
5. The brush according to claim 4, comprising a handle longitudinally extending from the bristle bed, wherein the actuator is provided at an end of the handle adjacent to the bristle bed.
6. The brush according to claim 5, wherein the movement of the movable part from the first position to the second position is a movement in a direction away from the handle.
7. The brush according to any one of claims 4 to 6, wherein the movable part comprises a rack slidably mountable, and the button comprises a gear pivotally mountable, and each of the rack and the gear is engageable such that actuating the actuator causes the rack to slide longitudinally.
8. The brush according to any one of claims 4 to 7, comprising a biasing device configured to bias the movable part to the first position.
9. The brush according to any one of the preceding claims, comprising a limiter configured to limit the degree of relative movement of the inner row and the two outer rows in response to actuation of the actuator, the limiter being adjustable to adjust the degree of relative movement of the inner row and the two outer rows.
10. The brush according to claim 9, which depends on claim 4, wherein when in the first position, the limiter abuts the movable part, and wherein the longitudinal position of the limiter is adjustable to adjust the first position of the movable part.
11. The brush according to any one of the preceding claims, wherein the free ends of the bristles are arranged such that a reference surface intersecting the free ends is concave.
12. The brush according to claim 11, wherein the reference surface is concave along two orthogonal axes.
13. The brush according to any one of the preceding claims, wherein each bristle is mounted to the bristle bed by an elastic mounting element.
14. The brush according to any one of the preceding claims, wherein each bristle is flexible.
15. The brush according to any one of claims 1 to 13, wherein each bristle is rigid.
16. The brush according to any one of the preceding claims, comprising a heater configured to heat the bristles of at least one of the inner bristle rows and the outer bristle rows.