The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 1990
Filed:
Dec. 07, 1989
Avraham Y Levi, St. Paul, MN (US);
Craig D Quarberg, Brooklyn Park, MN (US);
A. C. Innovations, Inc., Bloomington, MN (US);
Abstract
A locking mechanism for fixing the first and second telescopingly disposed tubular poles longitudinally relative to one another includes a longitudinally extending channel of rectangular cross-section projecting radially from the outermost tube and running the length thereof and an elongated rack having a plurality of spaced, parallel teeth projecting radially outward from the inner tubular member and fitted into the channel of the outer tubular member. Affixed to one end of the outer tubular member is a sleeve on which is rotatably mounted a locking ring having a notch extending along the width dimension thereof and a plurality of parallel, arcuate spaced-apart teeth circumferentially adjacent the notch. When the rack on the inner tubular member is aligned with the notch in the ring, the outer and inner tubular poles can slide relative to one another. By then rotating the locking ring, its teeth are made to mesh with the teeth on the rack of the inner tubular member, preventing further longitudinal displacement between the telescoping pole segments.