Locking device for telescopic rods
OwnerRenato Longoinventor
Life of this patent
Estimating the term…
Abstract
A reversible expansion locking element for selectively securing two tubes or rods in telescoping relationship with respect to one another wherein the element has oppositely oriented outwardly expandable conical threaded portions separated by a central protrusion. The expansion element is receivable within a first hollow tube and is adapted to receive a threaded end of the other tube or rod.
Claims6
A locking device adapted to secure two rods in adjustable telescoping relationship with respect to one another and wherein one of the rods is hollow having an inner diameter of a size for cooperatively and slidingly receiving the locking device therein and wherein the other rod includes a threaded expander portion from which extends a flanged head, the locking device comprising:
- a tubular body having an elongated axis with opposite ends and a central portion,
- a pair of oppositely oriented truncated conically configured threaded portions extending inwardly from each of said opposite ends of said body and which converge inwardly and terminate in spaced relationship with respect to one another adjacent said central portion of said body,
- said tubular body includes an intermediate protrusion which extends inwardly toward said axis of said body intermediate said threaded portions, and
- a slit formed in said body so as to extend along at least a portion of a length of each of said threaded portions so that said body is adapted to be outwardly expandable within said one of the rods to permit the flanged head of the threaded expander portion of the other rod to pass beyond said protrusion when the threaded expander portion is threadingly engaged with one of said threaded portions and to expand said body to frictionally engage said body within said one of said rods.
An extendable handle comprising:
- an outer tubular member and an inner rod having a threaded expander end portion,
- a locking device including a tubular body having an elongated axis with opposite ends and a central portion, said tubular body including truncated conically configured threaded portions extending inwardly from each of said opposite ends thereof which are in spaced relationship with respect to one another at said central portion of said tubular body, said tubular body being positioned within said outer tubular member with one of said threaded portions oriented to receive said threaded expander portion of said inner rod when said inner rod is inserted within said outer tubular member, said tubular body also including a slit therein which extends along at least a portion of a length of each of said threaded portions so that said tubular body is adapted to be outwardly expandable within said outer tubular member when said threaded expander end portion of said inner rod is threadingly engaged with said one of said threaded portions of said tubular body, said tubular body including a central protrusion extending inwardly toward said axis thereof intermediate said threaded portions, said inner rod including a head extending forwardly of said threaded expander end portion and said head having an outwardly extending flange, said head being shaped so as to allow said head to pass beyond said protrusion when said threaded expander end portion is threadingly received within said one of said threaded portions of said locking device and said flange of said head being engageable with said protrusion to prevent the withdrawal of said inner rod from said outer tubular member after said threaded expander end portion has been threadingly received within said one of said threaded portions of said tubular body.
Dependencies are inferred from the claim text.