发明授权
US4134599A Runnerless roller sled 失效
无滚轮滚筒雪橇

Runnerless roller sled
摘要:
An improved runnerless roller sled comprises a bed; a longitudinal, laterally flexible support member discontinuously attached to the bed beneath the bed center line; a front pair and a rear pair of roller wheels attached to the front and rear sections, respectively, of the support member; a steering bar attached to the front section of the support member; and a pair of braking means for separately or simultaneously braking the rear pair of roller wheels and comprising pairs of brake levers, brake rods, brake rocker arms and brake shoes.
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