Sectional roller shutter door especially for garage has length adjustment in the operating cable to compensate for the sections tilting into the upper horizontal storage position

摘要

An improved drive system for a sectional roller shutter door has a cable (10) looped over a roller at the bottom of the door and threaded over a crank system (14) for adjusting the cable length every time a section tilts into the upper storage position. The drive system also includes a spring system to compensate for cable tension. The drive system enable the sectional door to be fitted into low headroom sites, e.g. prefabricated garage modules.