Patent ID: 7455181

Claim:
A lid unit for closing a container body of a portable thin plate supporting container in which a plurality of thin plates are housed, said lid unit comprising: at least one latching mechanism for removably attaching the lid unit to the container body, said latching mechanism comprising: a locking member mounted to a body portion of the lid unit for linear movement between an extended position securing the lid unit to the container body and a retracted position allowing the lid unit to be removed from the container body; an actuator which is connected to the locking member for moving the locking member between the extended and retracted positions; a tip-side cam, in contact with said locking member, for pressing a tip end portion of the locking member in a first direction relative to the body portion of the lid unit and against a receiving portion of the container body when the locking member is moved to the extended position by the actuator, wherein the tip-side cam presents a surface oblique relative to the inner surface of the lid unit and on which a fulcrum, integral with the locking member, slides as the locking member moves between its retracted and extended positions; and a base side cam, in contact with said locking member for pressing a base end portion of the locking member in a second direction, opposite said first direction, when the locking member is moved to the extended position.