Self-righting toothbrush
Abstract:
A self-righting toothbrush includes a medial section disposed between head and tail sections. The head section mounts a set of frontwardly extending bristles. The tail section has a rearwardly extending asymmetry. The medial section has a pivot surface whose center of rotation defines a pivot point on a longitudinal neutral pivot axis. The pivot surface allows the toothbrush to pivot about the neutral pivot axis when the toothbrush is placed on a support surface. The head and tail sections have respective centers of mass. In a non-bristles up position, the head and tail section centers of mass are spaced from the neutral pivot axis on opposite sides thereof. Due to a moment imbalance dominated by the tail section center of mass, there is a net rotational moment about the neutral pivot axis that induces the toothbrush to pivot about the neutral pivot axis to a bristles up position.
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