Importance

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Abstract

Rigidity of an arm is improved in a linear extension and retraction mechanism. The linear extension and retraction mechanism includes a first connection piece string consisted of a plurality of first connection pieces; a second connection piece string consisted of a plurality of second connection pieces; and an ejection section adapted to form a columnar body by joining the first connection piece string to the second connection piece string and support the columnar body, in which a foremost one of the plurality of second connection pieces is connected with a foremost one of the plurality of first connection pieces, the first and second connection piece strings are joined with each other to constrain bending, thereby a columnar body with a tubular shape being formed, and the columnar body is relaxed when the first and second connection piece strings are separated from each other. In the linear extension and retraction mechanism, the first connection pieces have a width substantially equivalent to spacing between side plates of the second connection pieces and are fitted into the second connection pieces.

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First Claim