| 摘要 |
The extension guide has a U-shaped rail (2) with a U-section differential rail (7) mounted on running and support rollers (11,15). The horizontal flange (19) of the extension rail (16) is at about the half height of the rail , pref. below the cheek of the extension rail. The extension rail has a U-shaped cross section with an open upper face. The extension rail can be formed of bent or pressed strip profile. The body rail and the differential rail can be made of preformed steel sheet. The upper edges of the U-section extension rail have an outwardly extending flange (18). |
