Importance

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Abstract

Each one of telescopic units (12) that are used for a tripod includes a first tubular member (15). A second tubular member (16) is inserted in the first tubular member (15) so as to be capable of rotating circumferentially and enabling the adjustment of the distance by which the second tubular member (16) projects from the first tubular member (15). Press receiving surface portions (25) having a cross section which has an arc-shaped surface such that the center axis of the arc extends in parallel with the center axis of the first tubular member (15) are formed on the inner cylindrical surface of the first tubular member (15). Press applying surface portions (37) having a cross section which has an arc-shaped surface such that the center axis of the arc extends in parallel with the center axis of the second tubular member (16) are formed on the outer cylindrical surface of the second tubular member (16). Rotation of the second tubular member (16) in one direction circumferentially relative to the first tubular member (15) causes given locations of the press applying surface portions (37) to be pressed against the press receiving surface portions (25). Rotation of the second tubular member (16) in the other direction circumferentially relative to the first tubular member (15) releases the press applying surface portions (37) and the press receiving surface portions (25) from the press-contact with each other.

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First Claim