| 摘要 |
The system comprises a rail (3) and a multiplicity of tensioning strap runners (6). The rail has a gutter-shaped first track (24) and second and third tracks (25, 26) which are arranged above said first track and which are facing one another. Each of the runners (6) comprises a frame (7); at least two track rollers (15) which are arranged to roll in said gutter-shaped first track (24); and at least one auxiliary roller (11) which is arranged to co-operate with said second (25) and said third track (26) to keep the track rollers (15) in an upright position. The track rollers (15) and the auxiliary rollers (11) are all received in one single longitudinal chamber (18) of the rail (3), the walls of which provide the different tracks for these rollers. Due to this compact arrangement, the height of the rail can be reduced whilst still allowing to attach the tensioning straps (2) above the chamber (30) for the upright runners to the tensioning strap runners (6). A sufficiently large distance can thus still be maintained between the top of the frame (7) of the tensioning strap runners (6) and the lower edge of the rail (3) which is for example required by the present T.I.R. convention. |
