作者: Richard M. Hyman
DOI:
关键词: Spring (mathematics) 、 Composite material 、 Head (vessel) 、 Torsion spring 、 Bristle 、 Brush 、 Yoke 、 Base (geometry) 、 Integrally closed 、 Materials science 、 Mechanical engineering
摘要: A toothbrush has an elongated handle and a brush head supported at one end of the for limited pivotal movement between opposed arms yoke structure, i.e., by torsion bar support elements joining to edges head. further resilient element may be employed proximal provide additional resistance movement. Preferably is designed have increased spring constant as pivoted progressively farther from its normal position in substantially coplanar relation with thus acts effective stop limiting maximum The base which supports bristles, handle, integrally molded single mass synthetic resin material least are preferably formed polypropylene, or polymeric having same physical characteristics.