| 摘要 |
A rocking apparatus has a supported member and a supporting member. The supported member rotatably supported on the supporting member at two distant points on a rotary shaft. The rotary shaft is provided with a reaction force imparting member, which is constantly pushed toward its initial position by a reaction force imparting mechanism, so as to be capable of oscillation. A strut is provided between the reaction force imparting member and the supported member, and the supported member is supported on the reaction force imparting member and the rotary shaft by the three-point support using the connecting members and the strut. Further, a lock mechanism consisting of the locked member having engagement grooves, the lock member fitted in or removed from the engagement groove and a impetus giving member to transmit movement of the operating means to the lock member and elastically give an impetus at least in the direction for removing the lock member from the engagement groove is provided between the supported member and the supporting member, friction between the lock member and the locked member is used to prevent the lock member from coming off when the lock member is tried to be removed from the engagement groove and no load is being applied on the supported member, and the locked state is cancelled by using accumulated spring force to remove the lock member from the engagement groove at the same time when a load is applied on the supported member.
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