| 摘要 |
Disclosed is an alternate walker having extensible/contractible front and rear legs which comprises: a pair of reverse U-shaped frame pipes connected to each other in parallel through cross bar means; a pair of front legs slidably partly inserted into front lower ends of the pair of frame pipes respectively; a pair of rear legs slidably partly inserted into rear lower ends of the pair of frame pipes respectively; a train of serially connected substantially spherical bodies slidably inserted within each of the pair of frame pipes, the substantially spherical bodies in train being connected by a wire which is passed through the substantially spherical bodies in series and which is connected at its opposite ends to the front and rear legs respectively in each of the pair of frame pipes; and a pair of control means provided on the pair of frame pipes respectively for controlling sliding movement of the train of serially connected substantially spherical bodies within each of the pair of frame pipes.
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