| 摘要 |
An elevated support beam has a boom arm and two cam arms that pivot between a lower loading position and an elevated operating position. A passenger carriage is suspended from the cam arms and is releasably attached to the boom arm. In operation, the passenger carriage swings back and forth but is elevated safely from the ground because of the elevated cam arms. Alternative embodiments include separately pivotal boom and cam arms, a support beam sufficiently thick that the cam are not required, movable solid or fluid counterweights, and automatic pivoting assemblies that pivot the cam arms in anopposite direction from the boom arm, A method of swinging a passenger include pivoting the boom arm and the cam arms to the operating position, locking the cam arms in the operating position, and permitting the carriage to swing from the cam arms safely above the ground.
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