| 主权项 |
1. A portable support platform system comprising:
a support member, the support member being disposable above a reference surface and to which is affixed at least a pair of theatrical devices each emitting visible emissions and/or audible emissions, at least a portion of such visible emissions or audible emissions each forming a respective beam of emissions having a terminus at one of the theatrical devices, the support member having one end and an opposite end, a longitudinal axis delimited by the pair of ends, and a lateral axis perpendicular to the longitudinal axis, and one of the pair of theatrical devices being affixed to the support member at a spacing from the other of the pair of theatrical devices as viewed relative to the longitudinal axis of the support member, the first theatrical device emitting a beam of visible emissions and/or a beam of audible emissions along a respective emission axis and the second theatrical device emitting a beam of visible emissions and/or a beam of audible emissions along a respective emission axis, and the emission axis of the first theatrical device and the emission axis of the second theatrical device being at a predetermined orientation to one another and the first theatrical device and the second theatrical device being affixed to the support member such that their respective emission axes intercept the reference surface through a range of angular positions of the support member relative to the lateral axis; an orientation member attached to the support member; and re-orientation reaction member, the re-orientation reaction member being operatively intermediate the support member and a load bearing structure that is at a height above the reference surface greater than the support member such that, as the support member and the thereon affixed theatrical devices is suspended from the load bearing structure, an amount of the load of the support member, ranging from substantially entirely the load up to the entirety of the load, being applied via the re-orientation reaction member on the load bearing structure, and the re-orientation reaction member and the orientation member being in engagement with one another such that a movement of the re-orientation reaction member is transmitted via the orientation member to the support member in a manner that effects a re-orienting shift of the support member about its the lateral axis from a starting angular position to a new angular position of the support member relative to the lateral axis, the shift of the support member about the lateral axis changing the height of the first theatrical device relative to the height of the second theatrical device, as measured relative to the reference surface under a measurement condition in which this change in the relative heights of the first theatrical device and the second theatrical device is to be measured subject to the stipulation that the emission axis of the first theatrical device and the emission axis of the second theatrical device maintain the same predetermined orientation to one another both at their respective dispositions at the starting angular position of the support member before the re-orienting shift of the support member and at their respective dispositions after the re-orienting shift of the support platform, and the respective emission axes of the first theatrical device and the second theatrical device intercepting the reference surface at both the starting angular position of the support member and the new angular position of the support member. |
