Importance

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Abstract

An adjustable frame includes an outer tubular member and an inner cylindrical member disposed in longitudinally adjustable relation, the inner member being of substantially smaller diameter than the interior surface of the outer member so as to provide an annular space between the two members. Inner and outer adapter rings are disposed about the inner cylindrical member within the annular space. The adapter rings have longitudinally tapered mating surfaces for providing a cam action. A sleeve is threadedly supported from the outer tubular member and engages one of the adapter rings for moving it axially relative to the other ring to thereby create a radial expansion force within the annular space, thus locking the inner cylindrical member in a fixed longitudinal position relative to the outer tubular member.

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First Claim