| 摘要 |
A hinge mechanism includes a fixed member ( 20 ), two rolling elements ( 40 ), an elastic member ( 60 ), a rotational member ( 50 ) and a shaft ( 30 ). The fixed member has a flange ( 201 ) and a stop portion ( 202 ) thereof. Two first hollows ( 2022 ) are defined in the end part of the flange. Each rolling element has two rolling portions ( 402, 403 ). The rotational member includes a main portion ( 51 ) defined two hemisphere second hollows ( 511 ), and a middle portion ( 53 ) defining two receiving chambers ( 531 ) therein for receiving the rolling bodies. The first and second rolling portions of each rolling element are respectively received in the first hollow and the second hollow. The shaft extends through the fixed member, the elastic member and the rotational member. One end of the elastic member resists the rotational member and the other end of the elastic member is fixed in the longitudinal direction of the shaft.
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