CN110678100A

CN110678100A - Electric nail file

Info

Publication number: CN110678100A
Application number: CN201880034948.5A
Authority: CN
Inventors: 索菲·布儒瓦; 奥利维尔·斯马尔
Original assignee: Babyliss SARL
Current assignee: Babyliss Faco SPRL; Babyliss SARL
Priority date: 2017-06-07
Filing date: 2018-03-30
Publication date: 2020-01-10
Also published as: WO2018224199A1; EP3634172A1

Abstract

The invention relates to an electric nail file (1) comprising a handle (2) and a sanding head (3) removably mounted on said handle (2), said handle (2) housing a power source (4) for powering a motor (5) which, through a gear unit (9), allows the rotary motion of a rotary shaft (8) of the motor (5) to be converted into an oscillating motion of a drive shaft (6) which allows said sanding head (3) to oscillate during use, said sanding head having a substantially triangular cross-section and comprising three abrasive surfaces (7).

Description

Electric nail file

Subject matter of the invention

The present invention relates to an electric friction device for nails, called an electric nail file or an electric nail clipper, and more particularly, to an electric nail file including a detachable head.

Background

Electric nail files with interchangeable removable heads are well known to those skilled in the art. Each head consists of one or several abrasive surfaces, which are placed on the nail during the treatment of the nail. The detachable head has the advantage of providing the user with an abrasive surface with different abrasive particle sizes. Typically, a user initiates nail care using a head with coarser abrasive particles to reshape the nail. The user then finishes the nail with finer abrasive particles to complete the treatment. Each abrasive particle size provides different results. Based on the desired result, the user selects the appropriate abrasive surface.

Document FR 3038210 discloses an electric nail eraser comprising a hollow sleeve containing a power source, and a plurality of removable heads that can be connected to this sleeve using a drive shaft. During use of the device an oscillating movement of the head is generated. To replace the abrasive surface, the user must replace the removable head with another head.

Document JP 01171504 describes an electric nail file comprising a head having at least two different abrasive surfaces.

The main drawback of most prior art electric nail files is that a large number of file heads are required to cover the entire range of abrasion required to file the nail with the file. To file, fine and polish the nails with a file, using at least three heads, experience has shown that they are quickly lost and then if one head is left, the device cannot be practically used.

Another drawback that is often observed is the weakness of the motor (weakness), which is difficult to work with an undersized motor as soon as the abrasive surface is in contact with the nail.

Object of the Invention

The object of the present invention is to overcome the drawbacks of the prior art. The object of the present invention is, inter alia, to provide an electric nail file with a detachable head, which has a specific geometry allowing the use of several abrading surfaces due to the single head.

Brief description of the invention

An electric nail file is disclosed comprising a handle containing a power source for powering a motor which, through a gear, allows the rotary motion of the rotating shaft of the motor to be converted into an oscillating motion of a drive shaft, which allows said sanding head to oscillate during use, and a sanding head detachably mounted on said handle, said sanding head having a substantially triangular cross-section and comprising three abrasive surfaces.

The invention comprises at least one or a suitable combination of the following features:

the sanding head has a triangular cross-section with a circular face;

-the sanding head slides on a sliding guide extending through the handle, said sliding guide having a cross-section substantially of the same type as the sanding head;

-the abrasive surface is substantially parallel to the longitudinal axis of the drive shaft;

-the radius of curvature of the abrasive surface is between 10 and 25mm, preferably between 15 and 20 mm;

the abrasive surface has a curved shape at the distal end;

-the drive shaft comprises a locking slot at its distal end, allowing the sanding head to be snapped and held on the handle;

the rasp comprises a mechanism which allows the sanding head to pivot 120 degrees about the longitudinal axis of the rasp when the oscillating movement stops;

-each abrasive surface has a different roughness grade;

the file comprises means for adjusting the amplitude of the oscillating movement;

the file comprises means for adjusting the frequency of the oscillating movement;

-the braking force of the motor (stopping force) is between 25 and 50N, preferably between 30 and 40N;

the amplitude of the oscillating movement is between 1 and 5mm, preferably between 2 and 4 mm.

The invention also discloses a kit comprising an electrically powered nail file and self-adhesive abrasive sheets shaped to allow them to be placed on a sanding head.

Drawings

Fig. 1 shows an electric nail file according to the present invention.

Fig. 2 illustrates an exploded view of the electric nail file according to the present invention.

Fig. 3 illustrates a sectional view of the electric nail file according to the present invention.

Fig. 4 illustrates an enlarged view of an oscillating mechanism of the nail file according to the present invention.

Fig. 5 illustrates a partial sectional view showing the profile of the nail file according to the present invention.

Fig. 6 illustrates a sectional view of the sanding head of the nail file of the present invention having an abrasive surface with a radius of curvature of about 16 mm.

Fig. 7 shows a longitudinal sectional view of the sanding head of the nail file of the present invention, illustrating the possibility of tilting the abrasive surface between 90 and 98 degrees with respect to the longitudinal axis of the file.

Reference numerals in the figures

1: nail file

2: handle (CN)

3: sand grinding head

4: power supply

5: motor with a stator having a stator core

6: drive shaft

7: grinding surface

8: rotating shaft

9: gear mechanism

11: sliding guide

12: locking groove

Detailed Description

The present invention relates to an electric nail file 1 comprising a handle 2 and a detachable head 3 able to cooperate with the handle 2.

The handle 2 is hollow and houses in its cavity a power source 4, a motor 5, and a drive shaft 6.

A power source 4, such as a battery unit or rechargeable battery, provides power to the motor 5. This motor 5 in turn actuates a rotary shaft 8 connected to a gear mechanism 9. As illustrated in fig. 4, the gear mechanism 9 converts the rotational movement of the rotating shaft 8 into an oscillating movement of the drive shaft 6 by means of an eccentric rod placed in an asymmetric housing.

The sanding head 3 is detachably fastened to the handle 2 so that it can be easily replaced by other sanding heads with customized abrasive grains. In practice, the sanding head slides on a sliding guide 11 extending through the handle 2 and having a cross-section of substantially the same type as that of the sanding head 3. The male-female configuration of the sanding head/sliding guide assembly has several advantages. Which allows a quick exchange of the sanding head directly in the correct locking position and, in addition, the oscillating moving head is maintained strictly in the same plane without lateral vibrations, which considerably improves the comfort of the user. Drive shaft 6 includes locking grooves 12 at its distal end that allow sanding head 3 to be snapped and held onto handle 2. When the electric nail file is actuated, the head 3 performs a linear back and forth motion due to the oscillation of the driving shaft 6.

The sanding head 3 has a slightly rounded triangular cross-section allowing tangential contact with the nail. The sanding head comprises three faces on which three abrasive faces 7 are fixed, which during use are in contact with the fingernails. Because the sanding head 3 is removable, it can be easily replaced with another head. The radius of curvature of the abrasive surface is between 10 and 25mm, preferably between 15 and 20 mm. In fig. 6, the abrasive surface is shown with a radius of curvature of 16 millimeters.

The three abrasive surfaces 7 may have different roughness levels so that the user can select a surface suitable for his needs. In this way, the user does not have to change the sanding head 3 when it is desired to change the roughness. In addition, this allows him to avoid losing different removable heads when they have only a single type of grinding surface as in the prior art.

The abrasive sheet 7 is glued to the sanding head 3 using a repositionable adhesive. In this way, when the surface is damaged or excessively worn, the user can remove the surface in order to replace it with another abrasive sheet 7. To this end, a kit of self-adhesive abrasive sheets with different abrasive particles positionable on a sanding head may be provided with an apparatus that allows for the separate placement of the abrasive surface for each user.

The abrasive surfaces 7 of the sanding heads are substantially parallel to the longitudinal axis of the drive shaft 6. However, as illustrated in fig. 7, in a particular embodiment, the abrasive surface 7 may be slightly inclined at an angle between 90 and 98 degrees relative to the longitudinal axis of the drive shaft 6.

The abrasive sheet 7 has a curved shape at its distal end, that is, the end of the face 7 farthest from the handle 2 is rounded.

The handle 2 has an ergonomic shape.

In one advantageous embodiment of the invention, the rasp 1 includes a mechanism that allows the sanding head 3 to pivot about the longitudinal axis of the drive shaft of the rasp 1 when the oscillating motion is stopped. In this way, when the user wishes to replace the abrasive surface 7, he presses the button of the rotating mechanism of the actuation head 3, which then makes a 120-degree rotation with respect to the longitudinal axis of the device. Thanks to this mechanism, the user does not have to change the position of the handle in his hand when he desires to have another abrasive surface 7. In addition, he can keep the thumb pressed against the start button of the device if he so desires.

As previously explained, the abrasive sheet may have different roughness levels so that the user can select a surface suitable for his needs. Typically, the user starts nail care with low oscillation amplitude and low frequency of the sanding head using an abrasive with coarse abrasive particles, and therefore with a greater roughness. To complete his nail treatment, the user will select fine abrasive particles that will allow him to polish (polish) the nail and a larger oscillation amplitude and frequency than in the first step.

To this end, the electric file comprises means for adjusting the amplitude of the oscillating movement. The amplitude of the oscillating movement of the sanding heads 3 may be between 1 and 5mm, preferably between 2 and 4 mm. The apparatus may further comprise means for adjusting the oscillation frequency.

The braking force of the motor is between 25 and 50N, preferably between 30 and 40N, which ensures an efficient treatment of the nails. In this way, the oscillation of the sanding head 3 is still effective when the abrasive surface 7 is in contact with the user's fingernail.

The sanding head may comprise 3 faces with the same abrasive grain size or with different abrasive grain sizes. Abrasive grain size is typically used in the field of nail files and is between 100 and 3000 according to CAMI terminology (nomenclature). To shape the nail, the user will select between 100 and 400 abrasive particles, while to smooth the nail surface he will select between 400 and 1000 abrasive particles. Polishing of the nail was accomplished using an abrasive surface with approximately 3000 abrasive particles.

The electric rasp is an automatic device having a rechargeable battery or battery unit.

Claims

1. An electric nail file (1) comprising a handle (2) and a sanding head (3) removably mounted on said handle (2), said handle (2) housing a power source (4) for powering a motor (5) which, through a gear (9), allows a rotary motion of a rotary shaft (8) of the motor (5) to be converted into an oscillating motion of a drive shaft (6) which allows said sanding head (3) to oscillate during use, said sanding head having a substantially triangular cross-section and comprising three abrasive surfaces (7), characterized in that said sanding head (3) slides on a sliding guide (11) extending through the handle (2), said sliding guide (11) having a cross-section substantially of the same type as that of the sanding head (3).

2. The nail file according to claim 1, wherein the sanding head (3) has a triangular cross-section with a circular face.

3. The nail file according to any one of the preceding claims, characterized in that the abrasive surfaces (7) are substantially parallel to the longitudinal axis of the drive shaft (6).

4. The nail file according to any one of the preceding claims, characterized in that the radius of curvature of the abrasive surfaces (7) is between 10 and 25mm, preferably between 15 and 20 mm.

5. The nail file according to any one of the preceding claims, characterized in that the abrasive surfaces (7) have a curved shape at the distal end.

6. The nail file according to any one of the preceding claims, wherein the driving shaft (6) includes a locking groove at its distal end, which allows the sanding head (3) to be snapped and held on the handle (2).

7. The nail file according to any one of the preceding claims, characterized in that the file includes a mechanism that allows the sanding head (3) to pivot 120 degrees about the longitudinal axis of the file (1) when the oscillating movement is stopped.

8. Nail file according to any of the preceding claims, characterized in that each abrasive surface (7) has a different roughness grade.

9. A nail file according to any preceding claim including means for adjusting the amplitude of the oscillating movement.

10. A nail file according to any preceding claim including means for adjusting the frequency of the oscillating movement.

11. The nail file according to any one of the preceding claims, wherein the braking force of the motor (5) is between 25 and 50N, preferably between 30 and 40N.

12. The nail file according to any one of the preceding claims, wherein the amplitude of the oscillating movement is between 1 and 5mm, preferably between 2 and 4 mm.

13. A kit comprising the electric nail file according to any one of the preceding claims, and self-adhesive abrasive sheets having a shape that allows the self-adhesive abrasive sheets to be positioned on the sanding head.