Self-propelled roller skate

作者: Hyman Suroff

DOI:

关键词:

摘要: A self-propelled roller skate requiring a minimum of energy the wearer thereof includes an articulated frame having front portion, which propelling mechanism, and rear standing braking apparatus. The propulsion is accomplished by wearing individual merely raising portion his foot shifting body weight to heel same or opposite foot. Upon placing raised upon flat surface back that without any additional physical energy.

参考文章(1)
Corlise M Sweet, Roller skate with heel brake ,(1961)