US 4,134,703 AGranted

Locking structure for extensible pole

OwnerEarl S. Hinnersinventor

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Abstract

This invention relates to a locking structure for a pair of extensible or telescopic poles in which one of the poles has an upstanding bolt secured therein, carried on the bolt are a pair of frusto conical members having their tapered portions in facing engagement and being moveable along of the bolt, disposed between said frusto conical members is a split ring having angled or beveled inner surfaces corresponding to the adjacent tapered faces of said frusto conical members and an expandible nut threaded onto said bolt having a body portion compressible to have a pressure fit within the other of the poles and a locking washer holding the same onto said bolt whereby the rotation of pole in which the expanding member is disposed will move said expanding member downwardly of said bolt causing the frusto conical members to move toward each other thereby expanding the split ring therebetween causing the split ring to move outwardly into locking engagement with the adjacent wall surface of the first mentioned pole.

Claims1

Dependent claims

A locking structure for a pair of extensible or telescopic tubular members, having in combination

a first and inner tubular member slidable within a second and outer tubular member,
a threaded member having a head portion integral with and upstanding from the end portion of said first tubular member disposed within said second tubular member,
a wedge member freely slidable on said threaded member and being disposed thereon abutting said head portion,
a second wedge member freely slidable on said threaded member in superposed relation to said first wedge member,
said wedge members having facing tapered portions as mirror images of one another,
an operating member disposed on said threaded member in superposed relation to said second wedge member,
a hub portion of said operating member being threaded onto said threaded member,
a slotted skirt portion depending from said hub portion yielding circumferentially for a pressure fit within said second tubular member,
said skirt portion having a tapered bore therein,
said second wedge member having an upward extending portion tapered to mate with and be disposed in said tapered bore of said skirt portion,
a split ring disposed on said threaded member between said wedge members,
said split ring having inner facing portions corresponding with the adjacent tapered portions of said wedge members,
whereby when said operating member is rotated downwardly of said threaded member, said wedge members separate said split ring portions radially and urge the same into locking engagement with the adjacent surface wall portion of said second tubular member, said operating member being rotated by rotation of said second tubular member.

10 more elements

Dependencies are inferred from the claim text.