The present disclosure relates to beard trimmers.
Electric shaving apparatuses utilize various mechanisms to provide hair cutting functionality. Some electric shaving apparatuses have at least one perforated shaving foil and at least one undercutter which is constructed to be movable relative to the shaving foil. The shaving foil has a plurality of holes into which hairs thread themselves during the shaving operation. The undercutter is arranged in direct proximity to the shaving foil and is continually moved past the holes of the shaving foil during the shaving operation. As a result, the hairs which thread themselves into the holes of the shaving foil are severed by the undercutter. Such electric shaving apparatuses are intended to provide a clean shave. Some electric shaving apparatuses have rows of projected teeth that oscillate relative to one another, cutting hairs that are fed between the projected teeth. To adjust the cutting length, the user can attach a guard to increase the distance between the skin's surface and the projected teeth, thereby increasing the cut length of the hair.
Such electric shaving apparatuses may not be suitable for all users, such as users wishing to maintain hair at a length in between a close shave and a full beard, sometimes referred to as a stubble length. An electric shaving apparatus having perforated shaving foils, for instance, is configured to trim the hair at the skin's surface. Further, perforated shaving foils are generally not effective at cutting hairs exceeding a certain length, as feeding such hairs into the perforations of the shaving foil is difficult. While an electric shaving apparatus having projected teeth may be configured to receive a guard to set the trim length, the user of the electric shaving apparatus typically must orient the apparatus in many different positions relative to the skin during the shaving process in order to achieve the desired results. Such multiple orientations of the electric shaving apparatus are needed due to the arrangement of the projected teeth. More specifically, certain movement of the electric shaving apparatus relative to skin surface (i.e., across the grain) is required to properly thread the hairs into the gaps between the projected teeth so that the hairs can be cut.
Thus, it would be advantageous to provide for an electric shaving apparatus with features that address one or more of these issues. Indeed, it would be advantageous to provide for an electric shaving apparatus that enables a user to achieve a desired look, such as a certain amount of stubble, while maintaining a desired ease of use and comfort level.
It is an object of the present invention to improve the ability of the user to use a dry shaving apparatus to trim hair to a selectable stubble length or a close shave, while maintaining a desired ease of use and comfort. The present disclosure fulfills the needs described above by a beard trimmer having a handle, a motor and a head portion. The head portion comprises at least a first long hair cutter unit for trimming hair that is provided with a first outer cutter and a first inner cutter. The first outer cutter is provided with a cutter skin contact surface and a cutting side which is opposite to the skin contact surface. The motor drives one or both of the first inner cutter and the first outer cutter in order to move relative to the other and suitable to cut hair between the first inner cutter and the first outer cutter. For example this means that either the first inner cutter or the first outer cutter is actively motor driven or both together relative to each other. A first comb unit is releasably attached to the first long hair cutter unit. The first comb unit comprises comb teeth wherein each of the comb teeth has a tooth skin contact surface. The tooth skin contact surface is at an elevated level relative to the cutter skin contact surface so that the tooth skin contact surface is suitable to be brought in a skin contact and prevents the cutter skin contact surface to be brought in skin contact. A height difference of the tooth skin contact surface relative to the cutting side of the outer cutter defines a comb hair trimming length. The comb teeth are more flexible when the first comb unit is detached form the first long hair cutter unit relative to the comb teeth being less flexible when the first comb unit is attached to the first long hair cutter unit. The rigidity of the comb teeth when the first comb unit is attached to the first long hair cutter unit beneficially provides limited or no variance in cutting length when the beard trimmer is used, such that the cutting length uniformity is substantially or completely independent of pressure applied by the user towards the skin and or by the pressure applied by the beard trimmer towards the skin Several portions of the comb unit are supported and are resting on the long hair cutter unit and or the adjacent lateral long hair cutter housing sides so that a form fit of the inner side of the comb unit onto the attached portions which makes the per se flexible/bendable comb unit rigid and substantially non-flexible.
In order to increase comfort while limiting variance in cutting length, the first comb unit is adapted to allow an amount of flexing of the comb teeth in a comb teeth zone which is located closest to the first outer cutter of less than 0.6 mm, less than 0.4 mm, or less than 0.3 mm.
In order to further increase comfort, the first comb unit is adapted to allow an amount of flexing of the comb teeth in a comb teeth zone which is located closest to the first outer cutter.
Preferably, the first comb element is provided with an inner surface which faces the cutter skin contact surface and which is opposite to the tooth skin contact surface and wherein a distance between the cutter skin contact surface and the inner surface is below 0.6 mm, or below 0.4 mm or below 0.3 mm. Thus the uniformity of the cut length may vary by that minimal amount, even assuming that the user applies a highly varying pressure of the device onto the skin.
In order to increase the structural rigidity of the first comb unit the first comb unit comprises a side wall, wherein the comb teeth are integrally connected with each other by the side wall and wherein the side wall is surrounding the sides of the first long hair cutter unit.
In order to allow for the user to quickly and conveniently change trim length the first comb unit is releasably attached to the first long hair cutter unit and/or the head portion is releasably attached to the handle.
In order to provide a rotary-style beard trimmer the first inner cutter and/or the first outer cutter are driven by the motor to rotate or oscillate in a rotary direction relative to each other and wherein the comb teeth of first comb unit are circularly arranged.
In order to provide a linear-style beard trimmer, the first inner cutter and/or the first outer cutter are driven by the motor to move linearly relative to each other.
Preferably, the first comb element is made of a thermoplastic material and more preferably the first comb unit is made from Polyoxymethylene.
More preferably, the first comb element is made of a material having an Elastic Modulus ranging between 1850 MPa and 3850 MPa or the Elastic Modulus ranges between 2350 MPa and 3350 MPa. Thus the comb unit with such an Elastic Modulus is sufficiently flexible to be connected e.g. via a snap fit connection and can be easily attached or removed.
The present disclosure further fulfills the needs described above by a hair trimmer having a handle, a motor and a head portion. The head portion comprises at least a first long hair cutter unit and a first comb unit suitable for trimming hair with a specific comb hair trimming length, wherein the first comb element is made of a material having an Elastic Modulus ranging between 1850 MPa and 3850 MPa or the Elastic Modulus ranges between 2350 MPa and 3350 MPa.
The present disclosure further fulfills the needs described above by a method of using a beard trimmer, the method comprising the following use steps: moving the beard trimmer over a beard in direction a and cut and trim hair during that movement with a comb hair trimming length c, moving the beard trimmer over the beard in direction b, which is opposite to direction a, and cut and trim hair during that movement with a comb hair trimming length d, substantially maintaining the angel of inclination of the tooth skin contact surface relative to the skin during movement in direction a and b, and wherein the comb hair trimming length c is substantially the same as comb hair trimming length d. Thus the beard trimmer may be as ease used as an eraser and the user may not have to take care much about how the beard trimmer is inclined relative to the skin level.
The comb hair trimming length c is the same as the comb hair trimming length d with a tolerance of +/−0.4 mm and/or the angle of inclination of the tooth skin contact surface relative to the skin during movement in direction a and b is maintained with a tolerance of +/−10 degrees to provide the user with limited variance in trimming length irrespective of how the beard trimmer is moved and/or handled relative to the skin surface.
Conveniently, the handle is oriented and held in a user's hand the same way relative to the user's skin during movement in direction a and b so that the user does not need to regrip the beard trimmer during use.
The above-mentioned and other features and advantages of the present disclosure, and the manner of attaining them, will become more apparent and the disclosure itself will be better understood by reference to the following description of nonlimiting embodiments of the disclosure taken in conjunction with the accompanying drawings, wherein:
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described below. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. In case of conflict, the present specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and not intended to be limiting.
Other features and advantages of the invention will be apparent from the following detailed description, and from the claims.
The present disclosure provides beard trimmers for maintaining a desired styling aesthetic, such as a 1-day beard, a 3-day beard, or a 5-day beard, for example. Various nonlimiting embodiments of the present disclosure will now be described to provide an overall understanding of the principles of the function, design and operation of the disclosed beard trimmers. One or more examples of these nonlimiting embodiments are illustrated in the accompanying drawings. Those of ordinary skill in the art will understand that the methods described herein and illustrated in the accompanying drawings are nonlimiting example embodiments and that the scope of the various nonlimiting embodiments of the present disclosure are defined solely by the claims. The features illustrated or described in connection with one nonlimiting embodiment may be combined with the features of other nonlimiting embodiments. Such modifications and variations are intended to be included within the scope of the present disclosure.
The first comb unit 171A is selectably attachable to the first long hair cutter unit 130 to change the hair cutting length of the beard trimmer 102. The first comb unit 171A comprises comb elements 178 which, when the first comb unit 171A is attached to the first long hair cutter unit 130, are located adjacent to the multiple cutting slots 160 of the first outer cutter 140. As illustrated, the first comb unit 171A has multiple comb elements 178. Accordingly, when the first comb unit 171A is attached to the first long hair cutter unit 130, the comb elements 178 are positioned on each of the opposite sides of the first outer cutter 140. Each comb element 178 has a row 180 of comb teeth 172, with adjacent comb teeth 172 being separated by comb slots 177, the comb slots extending to ends of adjacent comb teeth 172 to define open ended slots, e.g., at open ends 177A. The width of one of the comb slots 177 is in the x axis for the first comb unit 171A and is in the range of 0.3 mm to 2.2. mm, for example. The comb teeth 172 may have any suitable cross-sectional shape, such as a T-shaped cross-sectional shape (as shown in
Further, as shown in
The opposing comb elements 178 of the first comb unit 171A may have certain teeth that are connected to one another, with such connection traversing the hair cutting gap 184. In some embodiments, one to five comb teeth of a row of comb teeth 172 on one side of the first comb unit 171A are connected with one to five comb teeth of the other row of comb teeth 172 on the opposite side of the first comb unit 171A. Such connection may aid in structural rigidity of the first comb unit 171A. All of the comb teeth 172 are coupled to an elongate circular wall 186.
The first comb unit 171A may have about the same number of comb teeth 172 on both lateral sides. Further, the cross sectional shape of the comb teeth 172 may be the same on both lateral sides of the first comb unit 171A. In some configurations, the first comb unit 171A has more than 15 comb teeth 172 on each lateral side thereof. Thus, the first long hair cutter unit 130 may have around the same number of cutting slots on both lateral sides. Accordingly, the first long hair cutter unit 130 may be substantially symmetrical with respect to both lateral sides so that said beard trimmer 102 is designed to be equally efficient in both opposite movement directions of the beard trimmer 102, with or without first comb unit 171A. Thus the first comb unit 171A may comprise comb teeth 172 on both lateral sides which are symmetrical and/or the same with respect to the tooth shape and its thickness along z axis and x axis, so that the first comb unit 171A is usable in both opposite movement directions along the y axis with the same hair catching result and/or hair combing result and/or hair trimming result. It is noted that the z axis is shown to extend from the motor shaft 108 (see
The comb teeth 172 of the first comb unit 171A may be more flexible, e.g., in a direction depicted by fz in
The first long hair cutter unit 130 may be provided with a lateral housing 196 which is also made of a thermoplastic material. The first comb unit 171A may be selectably coupled to the first long hair cutter unit 130 through any suitable type of connection, such as a snap fit connection. A snap fit connection serves to connect the lateral housing 196 with the first comb unit 171A. Further, the inner side of first comb unit 171A, which faces towards said first long hair cutter unit 130, may be tub shaped to define a cavity that is configured to receive at least a portion of the first long hair cutter unit 130. An opening is provided within the first comb unit 171A by means of a slot shaped center area 164. The lateral housing 196 may have features, such as a shoulder, groove, or other feature that is configured to engage with a protrusion or other projection of the first comb unit 171A to maintain the relative position of the first comb unit 171A to the first long hair cutter unit 130 once the first comb unit 171A is connected to the lateral housing 196. The first comb unit 171A may be snap fit connectable with the lateral housing 196 in a first position and in a second position, where the first comb unit 171A is rotated by 180 degree around the z axis in the second position relative to the first position.
The beard trimmer 102 may have a second comb unit 124 (
As shown in
In some configurations, the beard trimmer 102 comprises a functional non-shaving and non-trimming element 112 (
Referring to
The shaver head portion 114 may also be provided with a second shaver unit 118 which is of the same type as the first shaver unit 116 having a second foil-type outer shaver cutter 122. Further, the shaver head portion 114 may be provided with a third long hair cutter unit 132. The third long hair cutter unit 132 may be substantially similar to each of the first and second long hair cutter units 130, 158 having a non-foil type outer cutter 142 and an inner cutter. In the illustrated configuration, the third long hair cutter unit 132 is positioned between the first shaver unit 116 and the second shaver unit 118. The third long hair cutter unit 132 operates simultaneously as the first and second shaver units 116, 118. The motor shaft 108 may also be connected with a second drive pin 111 for driving either the second shaver unit 118 or the second long hair cutter unit 158 and/or the motor shaft 108 is connected with a third drive pin 113 for driving the third long hair cutter unit 132. The shaver head portion 114 and/or the removable head portion 110 may further be provided with a functional non-shaving and non-trimming element 112 (as shown in
Also included in the electric hair cutting kit 100 are a plurality of comb sets 170, 171, 173, and 175, with each comb set including comb units to the first and second long hair cutter units 130, 158. While four sets 170, 171, 173, 175 are depicted in
Referring to
As shown in
While
Similar to the first comb unit 171A described above, comb units 370A-C are releasably attachable to each of the rotary cutter units 348A-C, respectively. The comb teeth 372A-C on the comb units are circularly arranged and coupled to a circular wall 386A-C. Each tooth of the comb units 370A-C has a tooth skin contact surface, which is shown as tooth skin contact surface 382 for comb units 370A. The tooth skin contact surface 382 is at an elevated level relative to the cutter skin contact surface 354 so that the tooth skin contact surface 382 is suitable to be brought into skin contact. The teeth can be configured to direct hair into the rotary cutter units 348A-C, with outward tip portions 376 extending radially outward (
The rotary cutter units 348A-C may be provided with a housing 396 which is made of a thermoplastic material. The comb units 370A-C may be selectably coupled to the rotary cutter units 348A-C, respectively, through any suitable type of connection, such as a snap fit connection.
The comb teeth 372A-C of the comb units 370A-C may be more flexible when the comb units 370A-C are detached from the rotary cutter units 340A-C relative to the flexibility of the comb teeth 372A-C when the comb units 370A-C are attached to the rotary cutter units 340A-C. The comb units 370A-C may be adapted to allow for an amount of flexing of the comb teeth 372A-C in a comb teeth zone (shown as zone z in
Referring now to
Referring to
The dimensions and/or values disclosed herein are not to be understood as being strictly limited to the exact numerical dimensions and/or values recited. Instead, unless otherwise specified, each such dimension and/or value is intended to mean both the recited dimension and/or value and a functionally equivalent range surrounding that dimension and/or value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm”.
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Number | Date | Country | |
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20180085946 A1 | Mar 2018 | US |