| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal lamp which can be miniaturized without reducing the size of its screen. SOLUTION: This signal lamp includes filter housing parts 24a and 24b on both sides of an electric lamp projecting a light on a screen positioned in a casing. Arms 8a and 8a having filter fastening parts are supported to be freely rotated around rotation axes thereof. In a filter 15, one end parts of a transparent film having flexibility are fastened to the arms 8a and 8a respectively, and the other end parts thereof are housed in the filter housing parts 24a and 24b respectively so as to be freely drawn therefrom. Gears 40a and 40b are fastened to the arms 8a and 8a. A display color switching knob 9 is used when the other end parts of the transparent film in the filter 15 are drawn from the filter housing parts 24a and 24b. A display color switching rack 11 having gear parts 11ga and 11gb located on both the end parts respectively in an axial direction moves with the display color switching knob 9 operated to be moved. The gear parts 11ga and 11gb can be engaged with each other so as not to be synchronized with the gears 40a and 40b. Springs 25 and 25 are provide in such a manner that the arms 8a and 8a cannot be rotated around the rotation axes thereof towartd the filter housing parts 24a and 24b on the opposite side unless the knob 9 is switched in a condition where the both end parts are fastened between the arms 8a, 8a and the casing respectively. |
