| 摘要 |
PURPOSE:To prevent the deformation of a back wall to the direction outside of the case by a simple means and to eliminate hindrance in mounting operation to a deck by providing a spring bearing wall that receives the repulsion force of a spring member separately from a back wall in side of a main body case. CONSTITUTION:A spring bearing wall 15 that receives the repulsion force of a spring member 13 is provided at the inside of a main body case 1 separately from a back wall 8b. That is, the spring bearing wall 15 is projected from the inner face of the main body case between a stopper 7 on the inner face of the main body case 1 and the back wall 8b, and a spring member 13 is interposed between the spring bearing wall 15 and the stopper 7. By this constitution, the direct action of the repulsion force of the spring member 13 to the back wall 8b of the main body case 1 can be avoided, and the deformation of the back wall by the spring member 13 in the direction outside of the case when placed under high temperature environment can be prevented, thus, the hindrance on mounting operation to the deck can be eliminated.
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