| 摘要 |
Contact holders accommodated in defined regions are elastically returned to initial positions on the side of a wall. At the initial positions, stoppers are formed integral with a wall which defines the regions, in such a manner that the stoppers are in parallel with the wall and spaced a distance from the wall. Those stoppers are each in the form of a thin plate, and have protrusions which are extended towards the contact holders, respectively. Hence, when returning to the initial positions, the contact holders and strike against the protrusions of the stoppers, so that the latter are bent towards the wall while reducing the distance, thus decreasing the impact thereon when the contact holders strike against the stoppers.
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