US 5,333,824 AGranted

Extension pole having stabilizer means for securely attaching the extension pole to the main pole

OwnerEmanuel Dubinskyinventor

Life of this patent

Estimating the term…

Loading patent…

Abstract

A pole extension system for rigidly and tightly connecting an extension pole to a main pole. The main pole has a cylindrical end portion into which a T-nut is securely mounted coaxial with the pole axis. The extension pole has a cylindrical end portion forming an alignment shaft having a diameter that is smaller than the diameter of the main portion of the extension pole, such that an abutment shoulder is formed where the pole end portion meets with the extension pole. A bolt is mounted at the end of the alignment shaft and adapted for being screwed into the T-nut as the main pole and the extension pole are rotated relative to each other. A stabilizer means is mounted at the end portion of the main pole and includes a long tubular alignment sleeve having a length which extends past the end portion of the main pole and receives therein the alignment shaft in a close fitting relationship. In the connection step, the main pole is tightly and firmly attached to the extension pole by turning the poles relative to each other, thereby tightening the bolt and nut, with the poles further securely maintained by the alignment sleeve fitting around the alignment shaft and butted against the abutment shoulder on the extension pole.

A pole extension system for tightly connecting a main pole to an extension pole, comprising:

a main pole having a cylindrically shaped connecting end portion having a longitudinal axis, including a first screw means securely mounted at said connecting end portion in axial alignment with the longitudinal axis thereof;
an alignment sleeve made of a hollow rigid tube which covers said connecting end portion of said main pole and is attached thereto, said alignment sleeve having a length which extends axially out from said connecting end portion of said main pole and said first screw means by a length L1;
an extension pole having at one end an alignment shaft comprising a cylindrically shaped connecting end portion having a longitudinal axis, said alignment shaft having a diameter that is slightly smaller than the interior diameter of said alignment sleeve to provide said alignment shaft to be received in said alignment sleeve in a close fitting relationship, including a second screw means securely mounted at said connecting end portion of said extension pole in axial alignment with said longitudinal axis of said extension pole, said second screw means adapted to screw onto and lockingly engage with said first screw means as said alignment shaft is received in said alignment sleeve and said extension pole is rotated relative to said main pole, said alignment shaft having a length L2 equal to said alignment sleeve length L1, and shoulder abutment means at the end of said alignment shaft located said length L2 from said second screw means and adapted to abut with said alignment sleeve at the point where said first screw means is screwed onto said second screw means;
whereby the combination of said first and second screw means, said tight fit of said alignment shaft in said alignment sleeve, and said shoulder abutment means for engaging with said alignment shaft, provides a rigid and stable connection between said main pole and pole extension.

1 more element

Abstract

Claims10