Shaving apparatus with controllable motor speed
US5671535A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1995 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | May 31, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB26B19/28
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A shaving apparatus (1, 101, 201) is provided which includes at least one cutting unit (11) which is provided with an external cutting member (13) with at least one hair trap opening (17) and with an internal cutting member (19) which is rotatable in the external cutting member (13) by means of an electric motor (23). The speed of the motor (23) can be controlled during operation by a feedforward control unit (43, 103, 203) as a function of at least one physical quantity which can be measured during operation by means of a transducer (59, 69, 111). A first embodiment of the shaving apparatus (1) comprises a timer (59) which measures a time which has elapsed during a shaving operation, and a detector (69) with a microphone (71) which measures a cutting frequency of the cutting unit (11), the speed of the motor (23) being controllable by the control unit (43) as a function of the time which has elapsed during the shaving operation and of the cutting frequency. A second embodiment of the shaving apparatus (101) comprises a force detector (111) which measures a skin contact force exerted on the cutting unit (11), and again a detector (69) with a microphone (71) measuring a cutting freq…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.