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Collapsible cane

  • US 4,896,687 A
  • Filed: 10/31/1988
  • Issued: 01/30/1990
  • Est. Priority Date: 10/31/1988
  • Status: Expired due to Fees
First Claim
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1. A collapsible cane having a series of innerfitting smaller and larger telescoping sections which are interlocked against collapse when extended, each said smaller innerfitting telescoping section carrying internal expansion means activated by relative rotary movement between adjacent larger and smaller innerfitting telescoping sections for engagement with an inner wall of said larger innerfitting telescoping section, said internal expansion means including wedge elements threadably engaged by a common threaded member on opposite sides of a longitudinally slit locking cylinder to provide radial expansion and engagement with the inner wall of said larger innerfitting telescoping section, each said larger innerfitting telescoping section including circumferential depression means against which said internal expansion means operates to expand against an internal wall of said larger innerfitting telescoping section during the relative rotary movement between said sections, at least one of said larger telescoping sections also including a second circumferential depression means longitudinally spaced from said first circumferential depression means and positioned immediately adjacent an outer free end of each said larger telescoping sections, and each said second circumferential depression means in at least one of said larger telescoping sections being slidably engaged by an outer wall of an adjacent smaller telescoping innerfitting section to provide guiding and centering for said adjacent innerfitting smaller and larger telescoping sections during extension and collapse thereof.

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