| 摘要 |
A mobile telephone includes a main body ( 20 ) and a keypad ( 30 ). The keypad is mounted on the main body. The keypad is rotatable relative to an axis that is substantially perpendicular to the main body. The main body and the keypad are interconnected by means of a shaft ( 322 ) that is arranged along the axis. The keypad includes a spring-loaded ball ( 326 ) that is spaced apart from the shaft a distance. The main body defines a segmentary rounded guiding shallow groove ( 25 ) receiving a portion of the ball. The keypad is movable between a first position where the ball is located in a first end of the guiding groove and a second position where the ball is located in a second opposite end of the guiding groove.
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