A system for releasably securing a platform in a raised position is disclosed. A track is provided. An arm is connected at a first end to the platform. A second end, with a lug, is biased toward a side portion of the track. The lug is configured to ride in the track. As the platform is raised, the lug rides upward and enters the top portion and clears a first vertical wall, whereupon the lug rests in the depression and thus supports the platform in the raised position. As the platform is raised further, the lug clears a second vertical wall, whereupon the lug can ride downward in the side portion and through a bottom portion, past a door and out an open end of the bottom portion.

A system for releasably securing a platform in a raised position is disclosed. A track is provided. An arm is connected at a first end to the platform. A second end, with a lug, is biased toward a side portion of the track. The lug is configured to ride in the track. As the platform is raised, the lug rides upward and enters the top portion and clears a first vertical wall, whereupon the lug rests in the depression and thus supports the platform in the raised position. As the platform is raised further, the lug clears a second vertical wall, whereupon the lug can ride downward in the side portion and through a bottom portion, past a door and out an open end of the bottom portion.

A theater area includes audience seating that faces outwardly in an “inverted-theater-in-the-round” arrangement towards a ring-shaped performance stage. The performance stage is designed to rotate around the audience area so that each section of the audience can see each part of the stage at different times.

A theater area includes audience seating that faces outwardly in an “inverted-theater-in-the-round” arrangement towards a ring-shaped performance stage. The performance stage is designed to rotate around the audience area so that each section of the audience can see each part of the stage at different times.

An aerial navigation system comprises upright members mounted with anchor points at a substantially same height. Each anchor point is provided with an electric motor. A carrier device is coupled to the electric motors at corresponding ones of the anchor points using a set of first wires. The carrier device is operably moved by the electric motors in a horizontal plane co-planar with the anchor points. Further, a robotic device is suspended from the carrier device using a second wire. The robotic device is moveable within a volume defined between a ground surface, the plurality of upright members and the horizontal plane by at least one other electric motor mounted on the carrier device. Furthermore, a navigation control system synchronises operations of electric motors at the anchor points and the carrier device for moving the robotic device from a current location to a target location within the volume.

An aerial navigation system comprises four anchor points mounted on top of four upright members respectively at substantially same height from a ground, a carrier device coupled to a first set of four electric motors mounted at the four anchor points through a set of first wires. The set of first wires, the four upright members and the ground effectively define a volume. The carrier device is moveable in a bounded horizontal plane defined by the four anchor points. A robotic device is suspended from the carrier device using a second wire and moves vertically relative to the carrier device through activation of a fifth electric motor. A control unit is coupled to the first set of four electric motors and the fifth electric motor for controlling the three-dimensional movement of the robotic device to permit navigation from a current location to a target location inside the defined volume.

A navigation control system for an aerial robotic device suspended from a carrier device in an aerial movement volume of an aerial module. The navigation control system is configured to detect one or more stationary obstacles located in corresponding Aerial Movement Volume, create a 3D map representing the Aerial Movement Volume together with one or more bounding boxes enclosing each stationary obstacle in the Aerial Movement Volume, use an optimisation algorithm to compute an optimal route for the aerial robotic device, determine control parameters for a plurality of electric stepper motors driving the carrier device and the aerial robotic device based on the computed optimal route for the aerial robotic device, and navigate the aerial robotic device in accordance with the computed optimal route to enable the aerial robotic device to reach the required destination while avoiding intervening stationary obstacles.

A portable stage includes a folding framework supporting a removable deck. The framework includes opposing folding end framework assemblies and opposed side framework assemblies. The framework folds from an extended position for use and a folded positon wherein the framework is compact for storage. The side framework assemblies each include corner columns connected by angled portions having a V configuration forming an open space below the deck. The decks connect with pin connectors that extend into through holes in the deck. The pin connectors having a threaded connector supporting a pin that provides for relative axial movement when the pin is rotated from above to adjust stage height. Removable guardrails include mounting brackets that attach to the pin connectors.

A portable stage includes a folding framework supporting a removable deck. The framework includes opposing folding end framework assemblies and opposed side framework assemblies. The framework folds from an extended position for use and a folded positon wherein the framework is compact for storage. The side framework assemblies each include corner columns connected by angled portions having a V configuration forming an open space below the deck. The decks connect with pin connectors that extend into through holes in the deck. The pin connectors having a threaded connector supporting a pin that provides for relative axial movement when the pin is rotated from above to adjust stage height. Removable guardrails include mounting brackets that attach to the pin connectors.

A system for releasably securing a platform in a raised position is disclosed. A track is provided. An arm is connected at a first end to the platform. A second end, with a lug, is biased toward a side portion of the track. The lug is configured to ride in the track. As the platform is raised, the lug rides upward and enters the top portion and clears a first vertical wall, whereupon the lug rests in the depression and thus supports the platform in the raised position. As the platform is raised further, the lug clears a second vertical wall, whereupon the lug can ride downward in the side portion and through a bottom portion, past a door and out an open end of the bottom portion.