Abstract: Embodiments of the present disclosure are directed to an attraction system that includes a walkway, a carrier disposed at a first side of the walkway, and a barrier disposed at a second side of the walkway opposite the first side. The carrier is configured to translate relative to the walkway, and the barrier is removably coupled to the carrier. Translation of the carrier relative to the walkway transitions the barrier between a stowed configuration and a deployed configuration.

Abstract: Embodiments of the present disclosure are directed to an attraction system that includes a walkway, a carrier disposed at a first side of the walkway, and a barrier disposed at a second side of the walkway opposite the first side. The carrier is configured to translate relative to the walkway, and the barrier is removably coupled to the carrier. Translation of the carrier relative to the walkway transitions the barrier between a stowed configuration and a deployed configuration.

Abstract: A chassis clings to a ship hull or other ferrous surface by a magnet that moves toward or away from the surface to adjust the magnet air gap and thus the attractive force. The magnet(s) can be the only clinging force or used with other sources such as a suction chamber or fluid jet drive. An internal magnet on a crank mechanism can pivot around a wheel rotation axis inside a wheel body having a non-ferrous traction surface or tire. The magnet gap is least at an angle perpendicular to the surface on which the wheel rests, and larger at an angle oblique to that, for varying the attractive force to two or more levels. The vehicle can be an autonomous hull maintenance device with sensors, controllers and actuators to sense, measure and clean away fouling.

Abstract: A cassette pulley is assembled from a flange part having three assembly pins which are received in corresponding holes of a hub part. The hub part has a number of reinforcing ribs which divide the bottom of the hub part into a number of recesses which are conveniently employed to hold the hub part on a group of hub holding stub shafts during assembly. Because there are more recesses than holding stub shafts, the hub may assume more than one orientation relative to the stub shafts. In order to achieve proper relative orientation of hub and flange, the hub holder is formed with a hole that is aligned with one of the hub holes when the hub is in one of a selected group of orientations. Optical sensing of such alignment enables the flange to be positioned in an orientation appropriate for assembly of the flange pins into the hub holes.