Apparatus having body, cover, and locking mechanism

An apparatus having a body and a cover fittable to the body, the body and the cover each having front and rear portions respectively adjacent each other when the cover is fitted to the body, the body and the cover each also having first and second opposing side portions respectively adjacent each other when the cover is fitted to the body, the apparatus further having a locking mechanism for releasably locking the cover to the body when the cover is fitted to the body, the locking mechanism comprising:

• a first projection formed on the cover adjacent the first side portion thereof, the first projection projecting outwardly from the cover;
• a first engagement portion formed on one of the body and the cover at the first side portion thereof adjacent the first projection when the cover is fitted to the body, the first engagement portion engaging the other of the body and the cover to releasably lock the cover to the body at the first side portion thereof when the cover is fitted to the body;
• a second, opposing engagement portion formed on one of the body and the cover at the second side portion thereof, the second engagement portion engaging the other of the body and the cover to releasably lock the cover to the body at the second side portion thereof when the cover is fitted to the body;
• the cover being marginally displaceable relative to the body in opposing first and second directions toward the second and first side portions of the body, respectively;
• the cover being moved in a closing direction to fit the cover to the body and engage the first and second engagement portions;
• the first projection being urged in an opening direction to disengage the first engagement portion and unlock the cover from the body at the first side portion;
• the first projection thereafter being moved further in the opening direction to cause a gap between the cover and the body at the second side portion to increase in a direction substantially perpendicular to the opening direction, and subsequently to disengage the second engagement portion and unlock the cover from the body at the second side portion.