Importance

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Abstract

Two contraction-expansion pieces each have one end thereof connected to a base plate secured to a main body containing therein an opening and the other end thereof connected to a base plate secured to a lid serving to open and close the opening of the main body. The two contraction-expansion pieces which are each provided with a constricted, flexible elbow portion are pivotally fastened independently of each other and arranged in a mutually crossing state. Consequently, the two contraction-expansion pieces and the two base plates jointly form a pantographic mechanism. When the lid which is locked to the main body to keep the opening in its closed state while holding the pantographic mechanism in its folded state is released from the main body, the pantographic mechanism automatically expands and the lid is consequently brought to a completely opened state.

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First Claim