Abstract: The invention relates to a shaving apparatus comprising a housing (1) and at least one hair-cutting member (6). In order to prevent a user from irritating and injuring the skin during shaving, as far as possible, the shaving apparatus comprises means for warning the user when a given preset force is exceeded. The means can be, for example, one or more sensors which measure the force between the hair-cutting member and the housing during shaving. The sensor can be, for example, a Hall sensor (21), which is secured to the housing and which cooperates with an annular magnet (19), which is secured to a coupling pin (11) for driving the rotary hair-cutting member (6). The invention can also be used in wet-shavers.

Abstract: A power on/off circuit with a lock function includes a momentary type main switch connected to ground, a two-circuit two-contact lock switch coupled to, a switching state holding circuit, a load and a power supply. One of the switching circuits in the lock switch is connected between the main switch and the input terminal (CK) of the switching state holding circuit. The other switching circuit in the lock switch is connected between the main switch and the reset terminal (CLR) of the switching state holding circuit. The switching state of the main switch is held by the switching state holding circuit, and the state is maintained unless a reset signal is applied to the switching state holding circuit. The lock switch only functions to generate the reset signal so that the lock switch does not cut off the supply of current to the load as in a conventional shaver.