| 摘要 |
A lock for an extendable leg assembly including a sleeve coaxially receiving an end of an outer leg member and an inner leg member as it telescopes into the outer leg. The sleeve is hand-turnable between first and second rotational positions. In the first rotational position, the central axis of a ring turnable with and within the sleeve is coaxial with the leg members and a side face of the ring is flush with an inclined end face of the outer leg. In that position, the inner leg member is free to move into or out of the outer leg. In the second rotational position, the ring is turned such that its central axis forms an acute angle with the axis of the legs, the side face is inclined to the end face and the ring is canted by a spring to clamp against the inner leg and prevent further axial movement thereof into the outer leg, while at the same time permitting extension of the inner leg out of the outer leg member.
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