| 摘要 |
<p>PROBLEM TO BE SOLVED: To form a grip part into a small-sized and simple shape, and enable replacement of a key only. SOLUTION: A key 1 and a grip part case 2 are constructed in such a manner as to be freely removed. A slit-like opening part where a key root part 1a is fitted is formed on one side part of the case 2. The opening part is used as a battery replacement opening for attaching and detaching a flat battery 3 to and from the case 2 inside. With the key root part 1a accurately fitted in the slit-like opening part of the grip part case 2, the opening part is nearly completely blocked up. That is, the key root part 1a has such a structure as to also serve as a cover for the battery replacement opening.</p> |
