Abstract: An array of non-contact proximity sensors are mounted adjacent the front bumper of the loading bridge to be in opposition to the airplane. The proximity sensors are interconnected to circuitry, and the approach speed of the gangway to the airplane is reduced automatically as it nears the airplane. The sensors and circuitry sense angular misalignment of the gangway with the airplane and selectively and automatically control its position relative to the airplane.

Abstract: An array of non-contact proximity sensors are mounted on the front bumper of the loading bridge to be in opposition to the airplane. The proximity sensors are interconnected to circuitry, and the approach speed of the gangway to the airplane is reduced automatically as it nears the airplane. The sensors and circuitry sense angular misalignment of the gangway with the airplane and selectively and automatically control its position relative to the airplane.

Abstract: To enable a scaffolding structure to serve horizontally curved structures such as storage tanks, a connection is provided to allow horizontally adjacent scaffold transom element to be relatively inclined to one another in a horizonal plane. The joint includes connection means including a wedge to engage a socket afforded by a scaffold upright and such connection means is pivotally mounted on a scaffold cross member, such as a transom element, which itself affords a socket for the connection of a further cross member, such as a ledger element. Alternatively, the connection means may be pivotally mounted on a part provided with two such sockets for the releasable connection of a transom element and a ledger element.