Clamping structure in air-tightly sealable container

摘要

A clamping structure between a container body and a cover mountable thereon in an air-tightly sealable contained such as wafer carriers from semiconductor silicon wafers used for storage and transportation thereof. The clamping structure includes a container body and a cover mountable on the container body each provided with an encircling stepped flange around the open periphery. The stepped flanges on the container body and the cover are engageable each with the other. A pair of engagement tabs, each having an engagement groove, protrude from the open periphery of each of the container body and the cover at oppositely facing positions. Also, an engagement board which is resin plate is provided with a U-shaped openwork notch at the center thereof in a longitudinal direction. The notch is engageable at the upper part thereof with the engagement groove in the engagement tab of the cover and is engageable at the lower part thereof opposite to the upper part with the engagement groove in the engagement tab of the container body.