| 摘要 |
A collapsible cane having a series of interfitting smaller and larger telescoping sections which are interlocked against collapse, when extended, is disclosed. The smaller interfitting telescoping section includes an internal expansion device activated by relative rotary movement between adjacent larger and smaller interfitting telescoping sections for engagement with an inner wall of the larger interfitting telescoping section. The internal expansion device operates against a circumferential depression provided in the larger interfitting telescoping sections enabling the internal expansion device to expand against the internal wall of the larger interfitting telescoping section. At least one of the larger telescoping interfitting sections also includes a second circumferential depression immediately adjacent an outer free end thereof for slidable engagement with an outer wall of an adjacent smaller telescoping interfitting section to provide guiding and centering action between said adjacent interfitting smaller and larger telescoping sections during extension and collapse thereof. In conjunction therewith, the internal expansion device includes an improved positive locking action to positively secure the extended interfitting telescoping sections. To prevent unintended collapse of the telescoping sections, as a result of wear or the like, the second circumferential depression is positioned for engaging the internal expansion device to maintain operative engagement with the internal wall of the larger interfitting telescoping section, in the event of failure of the first circumferential depression worn down by continued used thereof.
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