| 摘要 |
<p>Insertion piece portions 25, each having a retaining portion 25a formed at a distal end thereof, is formed on that portion of a cover opening/closing portion 17 disposed near to a hinge portion 17. A cover body portion 11 has insertion hole portions 26 into which the insertion piece portions 25 can be fittingly inserted, respectively. The cover opening/closing portion 17 and the cover body portion 11 include slanting walls 22 and 16, respectively, which are opposed to each other, with the hinge portion 27 disposed therebetween, and the insertion piece portions 25 are formed on the slanting wall 22 of the cover opening/closing portion 17, and the insertion hole portions 26 are formed in the slanting wall 16 of the cover body portion 11. The pair of insertion piece portions 25 are provided, and the retaining portions 25a of the pair of insertion piece portions 25 project inwardly toward each other or outwardly away from each other. With this construction, the insertion piece portions 25 of the cover opening/closing portion 17 are inserted respectively into the insertion hole portions in the cover body portion 11, and the retaining portions 25a of the cover opening/closing portion 17 are retained by the insertion hole portions 26, respectively, so that the cover opening/closing portion 17 is held in the open condition.</p> |
