Opening and closing mechanism for battery compartment and water-proof/drip proof cover for the same

摘要

An opening and closing mechanism for a battery compartment including: a circular opening formed in a battery compartment; a plurality of disengagement prevention flanges that are formed at the peripheral edge of the circular opening; a circular cover for the circular opening; and a plurality of lock pawls provided at the peripheral edge of the circular cover. The lock pawls can enter the spaces between the flanges in an unlocking position of the circular cover and are located on the back surfaces of the flanges when the circular cover rotates from the unlocking position to a lock position. The lengths of the disengagement prevention flanges and the lock pawls in the circumferential direction are set so that when the circular cover is rotated by a predetermined angle from the unlocking position in a direction opposite to the direction toward the lock position, the lock pawls are still held in the spaces between the disengagement prevention flanges.