| 摘要 |
A telescoping device (12) used for a tripod, comprising a first tube-shaped body (15) and a second tube-shaped body (16) inserted into the first tube-shaped body (15) so that it can adjust its projecting length and rotate it along the circumferential direction, wherein the first tube-shaped body (15) forms, on its inner surface side, a pressed surface part (25) in arc surface-shaped cross-section having an arc center axis in parallel with the center axis of the first tube-shaped body (15) and the second tube-shaped body (16) forms, on its outer surface side, an acting and pressing surface part (37) in arc surface-shaped cross-section having an arc center axis in parallel with the center axis of the second tube-shaped body (16), whereby a specified portion of the acting and pressing surface part (37) is pressed against the pressed surface part (25) by a rotating operation of the second tube-shaped body (16) relative to the first tube-shaped body (15) in one direction along the circumferential direction, and the pressed state of the acting and pressing surface part (37) against the pressed surface part (25) is released by the rotating operation of the second tube-shaped body (16) in the other direction along the circumferential direction. |
