| 摘要 |
The pressure overload indication system for power toothbrushes, comprises: i) A brushhead member having a mounting base for bristles which extend from one surface thereof and a pressure contact element which extends from an opposing surface of the mounting base; ii) A rigid brushhead shield member which is positioned apart from the pressure contact element when there is no pressure applied to the brushhead; iii) Electrical contact elements, mounted on the brushhead shield so that when no pressure is applied to the brushhead there is a first selected distance between the pressure contact element and a first electrical contact element and a second selected distance between the electrical contact elements, wherein the first electrical contact element is movable under pressure toward another electrical contact element, the electrical contact elements being part of a normally open electrical circuit which includes an indicator element; iv) A hinge-like member supporting the brushhead at an inboard end thereof which allows the brushhead to move toward the brushhead shield member when pressure is applied on the brushhead against the teeth, wherein the first and second selected distances are such that a predetermined pressure applied to the brushhead results in electrical contact between the electrical contact elements, closing the electrical circuit and activating the indicator element, indicating a pressure overload condition.
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