| 摘要 |
PURPOSE:To prevent falling down of a tonguelike member by pressing a bush which supports a turning shaft into a housing except both end parts of the bush and supporting the turning shaft by both end parts. CONSTITUTION:A bush 20, supporting a turning shaft 21 of a tonguelike member 11, is pressed into a housing 3 except its both end parts 20A, 20B. Further, the diameter of a turning shaft part 21A corresponding to the pressed part 20C of the bush 20 is made smaller, and the turning shaft 21 is supported by both end parts 20A, 20B of the bush 20. Thus, a gap between both end parts of the bush 20 and the turning shaft 21 is set at the minimum so that falling down of the tonguelike member 11 can be prevented. |
