Patent ID: 8240254
Filing Date: 2012-08-14
Classification: A62B,A63G,B61B

Abstract:
1. A method comprising: selecting a system including first and second supports corresponding to start and finish areas, a cable held in suspension between the first and second supports, and a trolley comprising a keeper constraining the trolley to travel along the cable in first and second directions, opposite one another, between the first and second supports; providing a retrieval line suspended in a closed loop extending from proximate the first support to proximate the second support along a path of the cable and spaced therefrom; providing a connector selectively connecting the trolley to the retrieval line; providing a motivator selectively circulating the retrieval line in the first and second directions around the loop to move the connector in the first and second directions; operating a controller controlling operation of the motivator to alternate circulation of the retrieval line between the first direction and the second direction; and disconnecting the trolley from the connector when traveling in the second direction; connecting the trolley to the connector to effect travel of the trolley in the first direction; connecting the trolley to the retrieval line while loading another trolley; and pulling one of the trolleys from the finish area to the start area while returning a disconnected trolley connector on the retrieval line to the finish area to continue a cyclical pattern.