| 摘要 |
PROBLEM TO BE SOLVED: To easily mount and demount a bulb by forming a plurality of projections as engagement parts on an outer side of a bulb body for a screw thread, forming the grooves as guideline to be engaged with the projections of a bulb base, engaging the grooves with the projections of the bulb body, and turning them along the guide line. SOLUTION: The grooves as guideline to be engaged with the projections 3 of a bulb base of a bulb, are formed on a socket 9. The comparatively wide longitudinal grooves are formed near an inlet so that the projections 3 can be easily fitted, the resistance feeling is increased by the repulsion of a spring 5 supporting an electrode 7 mounted on a bottom of the socket 9 when the projections 3 are pressed to the end along the longitudinal guideline formed on the socket 9, but the bulb is rotated left or right along the guideline while keeping the pressing when the projections reach the lateral grooves 6 contacted with a deepest part 15 of the longitudinal grooves, whereby the projections 3 are entered into the lateral grooves 6 and stopped in such manner that the projections 3 are held by the electrodes 7 with springs mounted on the recessed longitudinal groove 10 at a central part of the lateral grooves.
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