| 摘要 |
A control knob device has a main body defining a top surface having a ring-shaped stopping wall with two inserting openings formed thereon, and a lateral surface having a guiding recess extending upwards and downwards and a sliding slot running circumferentially and communicating with the guiding recess, with the depth thereof greater than that of the guiding recess. A shell coupled to the main body has a covering plate with two blocking portions located outside the stopping wall and adjacent to the inserting openings, and a lateral plate extending inwards to form an inserting slice corresponding to the sliding slot. The shell is coupled to the main body by the inserting slice passing through the guiding recess and inserted into the sliding slot. Two elastic ends of a spring element are inserted into the inserting openings and abut against the blocking portions for making the rotated shell return automatically.
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