| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the number of components and to facilitate the assembling work by forming left and right buttons by making a cut in the front part of an upper case itself to divide the front part into lift and right parts and allowing the respective left and right buttons to freely and flexibly return in the direction of pressing or separation. SOLUTION: An upper case 11 is provided with an elliptical window 11a exposing the elliptically swelling part of a middle case, and a notch 11b reaching the window 11a is formed at a central part its front part in a longitudinal direction while dividing it to the left and right parts to form a left button 13a and a right button 13b shown by half-tone dot meshing. Then, the case 11 united integrally with both the buttons 13a and 13b in this way is fixed to the middle case at its rear part with screws 16. Then, the buttons 13a and 13b can freely and flexibly return in the direction of pressing or separation with a screw stopping part as a support. Furthermore, armatures 15 brought into contact with switches are respectively provided on the rear faces of the both buttons 13a and 13b.</p> |
