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 coupled to or within 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 stem defining a longitudinal stem axis and having a first end coupled to the handle and a second end;
a mascara applicator head coupled to the stem second end and supported for movement;
a drive coupled to both the handle and the applicator head;
a torque limiter coupled to or within 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, the torque limiter comprising an outer hollow shaft coupled to the drive and an inner shaft coupled to the applicator head, the inner shaft being at least partially disposed in the hollow outer shaft such that the inner and outer shafts define a pair of opposing surface in frictional connection; and
a container comprising a mascara composition.
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 torque limiter 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 torque limiter comprises a slip coupling.
6. The cosmetic applicator according to claim 5 , wherein the slip coupling comprises a pair of opposing surfaces coupled to each other through a frictional connection.
7. The cosmetic applicator according to claim 6 , wherein at least one of the opposing surfaces comprises a coating having a static coefficient of friction and a kinetic coefficient of friction.
8. The cosmetic applicator according to claim 6 , wherein at least one of the pair of opposing surfaces is deformable.
9. The cosmetic applicator according to claim 6 , comprising a pair of wheels, each wheel having a rim, each rim defining one of the pair of opposing surfaces.
10. The cosmetic applicator according to claim 6 , comprising a resilient member biasing one of the opposing surfaces towards the other surface.
11. The cosmetic applicator according to claim 10 , wherein the resilient member comprises a spring.
12. The cosmetic applicator according to claim 11 , wherein one of the opposing surfaces is defined by a surface of a resilient member that abuts the other of the opposing surfaces.
13. The cosmetic applicator according to claim 6 , wherein at least one of the pair of opposing surfaces comprises a non-planar surface.
14. The cosmetic applicator according to claim 13 , wherein the slip coupling comprises complementary concave and convex surfaces.
15. The cosmetic applicator according to claim 6 , wherein the torque limiter comprises a shaft having a first end coupled to the drive and a second end with a receptacle formed therein, and wherein the applicator head comprises a mounting shaft having a first end coupled to an applicator and a second end disposed within the receptacle formed in the second end of the shaft.
16. The cosmetic applicator according to claim 5 , wherein the slip coupling comprises a pair of complementary-shaped, non-planar opposing surfaces, and wherein a resilient member moveably biases one of the opposing surfaces towards the other of the opposing surfaces.
17. The cosmetic applicator according to claim 5 , wherein the slip coupling comprises a flexible arm having a first end coupled to one of the drive or the applicator head and a second, cantilevered end, and a stiff detent having a first end coupled to the other of the drive and the applicator head and a second end disposed so as to abut the second, cantilevered end of the flexible arm.
18. The cosmetic applicator according to claim 5 , wherein the slip coupling comprises a first shaft having at least one leg pivotally coupled thereto and a second shaft having surface, the leg moveable in response to rotation of the first shaft between a first state wherein the at least one leg is substantially parallel to the first shaft and a second state wherein the at least one leg abuts the surface of the second shaft.
19. The cosmetic applicator according to claim 5 , wherein the slip coupling comprises a belt coupled at spaced points to the drive shaft and the applicator head.
20. The cosmetic applicator according to claim 19 , wherein the slip coupling comprises a first wheel coupled to the drive and having a first rim and a second wheel coupled to the applicator head and having a second rim, the belt being disposed about the first rim and the second rim.
21. The cosmetic applicator according to claim 20 , wherein the slip coupling comprises an idler wheel having a third rim, the belt being disposed with a first surface abutting the first and second rims and a second, opposing surface abutting the third rim.