Patent ID: 8082854

Claim:
A chassis ( 1 ) for a cable or pipeline trolley ( 2 ) for movement along a carrier rail in a direction of movement, the chassis ( 1 ) having a central vertical axis ( 5 ) and comprising: at least one pair of carrier rollers ( 3 ), each carrier roller ( 3 ) having a separate horizontal axis of rotation; and at least one pair of guide rollers ( 4 ) having a vertical axis of rotation perpendicular to each horizontal axis of rotation, the carrier rollers ( 3 ) and the guide rollers ( 4 ) arranged in an arrangement such that one of the pair of carrier rollers ( 3 ) is located in front of with respect to the direction of movement one of the pair of guide rollers ( 4 ) on a first side of the carrier rail and the other carrier roller ( 3 ) is located behind with respect to the direction of movement the other guide roller ( 4 ) on a second side of the carrier rail, the carrier roller ( 3 ) on the second side of the carrier rail opposing the guide roller ( 4 ) on the first side of the carrier rail and the carrier roller ( 3 ) on the first side of the carrier rail opposing the guide roller ( 4 ) on the second side of the carrier rail, wherein the arrangement of the carrier rollers ( 3 ) and the guide rollers ( 4 ) is axially symmetrical to the vertical axis ( 5 ) of the chassis ( 1 ) and wherein no two carrier rollers ( 3 ) have the same horizontal axis of rotation.