Small electrical devices

Abstract

The seal structure is designed to maintain proper sealing performance even when external forces are applied to the main body case or lid that constitute the main body. [Solution] The main body 1 of the small electrical device includes a container-shaped main body case 9 having an assembly opening 8 at the top, a lid 10 that closes the assembly opening 8, an inner case 11 housed inside the main body case 9 and the lid 10 to hold a power supply unit 16, and a seal structure 12 that seals the space between the main body case 9 and the lid 10 in a watertight manner. The seal structure 12 consists of a cylindrical assembly peripheral wall 66 that forms the assembly opening 8 of the main body case 9, a cylindrical lid peripheral wall 63 that forms the lid 10 and is arranged to abut the assembly peripheral wall 66 at the top and bottom, a seal ring 67 that is attached to the inner case 11 and fits inside, straddling both peripheral walls 63 and 66, and ring-shaped packings 68 and 69 that are arranged between the opposing surfaces of the lid peripheral wall 63 and the seal ring 67 and between the opposing surfaces of the assembly peripheral wall 66 and the seal ring 67.

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