| 摘要 |
An improved height-adjustable crutch is provided in which the central carrier member, in which is telescopingly received an extensible leg member, is provided with laterally extending ribbed members, defining exterior concave surface, which matingly received therein the cylindrical portions of the diametrically-opposed tubes defining the lower extremity of the crutch proper. Each tube is coupled to a respective one of the ribbed members via a rivet, each rivet being independent of the other, so as to not to obstruct the interior, hollow passageway formed by the central carrier member, to allow for the sliding movement of the leg member in the central carrier member. Each ribbed member defines an arcuate interior opening having a diametric expanse less than that of a detent sphere used for retaining the extensible leg member within the hollow interior at a desired height level thereof, so as to allow for the rotation of the extensible leg member in the hollow interior during readjustment of the extensible leg member to a desired height. Each ribbed member substantially extends along the entire length of the lateral surface of the central carrier member.
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