| 摘要 |
The toothbrush head of the present invention is designed to conform to teeth surfaces by equalizing bristle pressure longitudinally. There is an elastomeric field, populated with bristles, that is allowed to flex within a rigid perimeter frame. The frame is bonded to a rigid top member which is an extension of the toothbrush handle. A bristle pressure equalizing device adjusts the longitudinal shape of the bristles by sensing and equalizing the pressures on the elastomeric field and bristles. This equalization of bristle pressures applies to convex and concave teeth surfaces. In four embodiments, the bristle pressure equalizing device is a confined mobile substance located in the elastomeric field or in bladders between the top of the elastomeric field and the underside of the top member of the head. Initial bristle pressure pushes the elastomeric field toward the equalizing device which transfers the mobile substance longitudinally to bristle regions of less pressure, thus equalizing bristle pressures. In another embodiment, the pressure equalizing device is a flat spring bonded to and roughly the size of the elastomeric field. The top member differs from other embodiments in that it has additional transversal ribs the full transversal width of the elastomeric field and are positioned longitudinally such that when initial bristle pressure is applied the spring reacts to equalize bristle pressures.
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