Electrical toothbrush

Claim 1

In an electrical toothbrush having, a housing composed of an upper housing portion and a lower housing portion which are interconnected mutually, an interior space defined by the housing, an electric motor mounted in the housing for rotating an eccentric pin, the motor being connected from a battery, and switched on and off by an external switch, a reciprocating vibratory toothbrush holding shaft mounted longitudinally in the upper housing being adapted for attachment of a toothbrush thereon, the holding shaft being drivable for oscillation about its longitudinal axis, the toothbrush having bristles affixed to the upper end thereof and being interchangeably connected to the upper end of the holding shaft, means for transforming the rotary motion of the eccentric pin into a reciprocating vibratory motion of the holding shaft which carries the toothbrush, characterized in that the motion transformer comprises: a cylindrical member and an elastic deformable member connected by an integral lever member, the motion transformer being formed from a plastic material having toughness and flexibility, an intermediate portion having a central bore for receiving the eccentric pin and an extension to which a shorter transverse wall is connected, and a deformable film wall portion having one end connected to the integral lever member and the other end connected so the shorter transverse wall.