1. SAFETY DEVICE FOR PLUMBING tensioning mechanism CURTAINS ISOTHERMIC REFRIGERATED TRAILERS preferably applied in those tensioning mechanisms which consist of a shaft (3) ON WHICH ONES CURL GIRTHS (2) OCCURS SITUATED AT THE END OF THE CURTAIN ISOTERMICA (1) empowered tensioning / slackening THESE homogeneously, for the shaft (3) features a crown (4) LOCATED IN A BOX OF MECHANISMS (5) meshing with AN EXTERIOR HEAD (6) EMPOWERS whose performance rotation of the shaft (3); Essentially characterized in that: - has means for sealing the outer head (6) which are determined by a fixed profile IN WHICH RETAINS A FOLDING PROFILE, one of whose POSITIONS Obtura OR BLOCKS, WITH THE FIXED PROFILE, ACCESS A FOREIGN head (6), and another portion EMPOWERS ACCESS TO THIS; - HAS SEALED FIXING MEANS OF FOLDING PROFILE POSITIONED IN POSITION sealing the outer head (6).
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