Cosmetic applicator with torque limiter
View Patent ↗A cosmetic applicator includes a handle, a drive coupled to the handle, an applicator head coupled to the drive, and a torque limiter. The torque limiter includes a magnetic coupling, the magnetic coupling being coupled to at least one of the drive and the applicator head such that the torque applied via the applicator head does not exceed a predetermined allowable torque.
1. A mascara applicator comprising:
a handle;
a drive coupled to the handle;
an applicator head coupled to the drive by a first shaft and a second shaft that are aligned along a common axis, the applicator head comprising an applicator surface and a plurality of applicator elements that extend radially away from the applicator surface, the applicator elements being configured to separate keratinous fibers and apply a mascara composition thereto; and
a torque limiter comprising a magnetic coupling, the magnetic coupling including a first magnet and a second magnet, the first magnet being coupled to one of the first and second shafts, the second magnet being coupled to the other of the first and second shafts, and the first and second magnets being magnetically coupled to each other such that the torque limiter prevents the torque applied via the applicator head from exceeding a predetermined allowable torque that is from 0.05 to 5 ounce inches;
wherein the applicator head is configured to be driven by the drive and to rotate at a speed of 1-200 rpm.
2. The cosmetic applicator according to claim 1 , wherein the drive comprises an electric motor.
3. The cosmetic applicator according to claim 1 , wherein the drive comprises a mechanical motor.
4. The cosmetic applicator according to claim 1 , wherein the magnetic coupling is coupled between the applicator head and the drive to transmit motion between the drive and the applicator head.
5. The cosmetic applicator according to claim 1 , wherein the magnetic coupling comprises at least one electromagnet.
6. The cosmetic applicator according to claim 1 , wherein the magnetic coupling comprises at least one permanent magnet.
7. The cosmetic applicator according to claim 1 , wherein the first and second magnets are aligned along a common axis in a first, coupled state, and aligned along parallel axes in a second, decoupled state.
8. The cosmetic applicator according to claim 1 , wherein the first and second magnets are disposed with opposing surfaces of the first and second magnets abutting.
9. The cosmetic applicator according to claim 8 , at least one of the opposing surfaces of the first and second magnets comprising a coating having a static coefficient of friction and a kinetic coefficient of friction.
10. The cosmetic applicator according to claim 1 , wherein the first and second magnets are disposed with a gap therebetween, and wherein the magnetic coupling comprises a spacer disposed in the gap.
11. The cosmetic applicator according to claim 10 , wherein the spacer comprises a first layer and a second layer, the first and second layers having opposing surfaces frictionally coupled to each other.
12. A mascara applicator comprising:
a handle;
a drive coupled to the handle;
an applicator head coupled to the drive by a first shaft and a second shaft that share a common axis, the applicator head comprising an applicator surface and a plurality of applicator elements that extend radially away from the applicator surface, the applicator elements being configured to separate keratinous fibers and apply a mascara composition thereto; and
a torque limiter comprising a magnetic coupling, the magnetic coupling including a first magnet and a material having a medium to high magnetic permeability, the first magnet being coupled to one of the first and second shafts, the material being coupled to the other of the first and second shafts, and the first magnet and the material being magnetically coupled to each other such that the torque limiter prevents the torque applied via the applicator head from exceeding a predetermined allowable torque that is from 0.05 to 5 ounce inches;
wherein the applicator head is configured to be driven by the drive and to rotate at a speed of 1-200 rpm.
13. The cosmetic applicator according to claim 12 , wherein the material comprises iron.
14. The applicator of claim 12 , wherein the predetermined allowable torque is from 0.1 to 2 ounce inches.
15. The applicator of claim 12 , wherein the predetermined allowable torque is from 0.5 to 1.5 ounce inches.
16. The applicator of claim 12 , wherein the applicator head is configured to rotate at a speed of 10-60 rpm.
17. The applicator of claim 1 , wherein the predetermined allowable torque is from 0.1 to 2 ounce inches.
18. The applicator of claim 1 , wherein the predetermined allowable torque is from 0.5 to 1.5 ounce inches.
19. The applicator of claim 1 , wherein the applicator head is configured to rotate at a speed of 5-100 rpm.
20. The applicator of claim 1 , wherein the applicator head is configured to rotate at a speed of 10-60 rpm.