| 摘要 |
A circular-plate holder is disposed at an end of a cylindrical portion arranged in a tripod head. A pair of arc lever tumblers, which is capable of contacting the inner surface of the cylindrical portion, is rotatably supported on the holder around a rotation axis. The ends of the arc lever tumblers are close to each other. A rotator, which has a gear portion at a tip end, is rotatably supported on the holder around a rotation axis disposed between the other ends of the lever tumblers. Each of the tumblers is connected to the rotator by a pair of linkage means. The gear portion of the rotator engages a gear portion of a torque-adjusting shaft, which extends through a central portion of the holder and rotates according to rotational operation of an adjusting knob.
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