| 摘要 |
PURPOSE:To obtain a channel selection device using push buttons with a simple constitution, by unidirectionally activating a strip shaped locking cam plate having holes corresponding to the push buttons and locking the plate with projected cams in depressing the buttons. CONSTITUTION:In depressing a push button 11 against the spring force of a coil spring 14, a locking cam plate 16 is moved against the spring force of a coil spring 16b with a cam surface of a cam 11d in response to the depressing stroke. When the button 11 is further depressed, the cam 11d passes through a latch hole 16a of the plate 16 and the plate 16 is restored to the home position with the spring force of the coil spring 16 at the moment, the cam 11d and the latch hole 16a are latched and the button 11 is locked. Similarly, a push button 12 can be locked by depressing it in the same way. |
