| 摘要 |
<p>An automatic tensioning and locking device for fabric and/or netting roller blinds and mosquito-curtains, to be associated with a roller box endpiece provided with a support pin for a winding roller in which a return spring and a drive bush for said roller interact between said roller and said support pin, about said drive bush there being wound a spiral spring the ends of which alternately abut against a cam unit which is rotatable coaxially with the drive bush and carries a pin which interacts with an elastically loaded stop element rockable at least between a position in which said fabric and/or netting can freely unwind, a position in which unwinding/rewinding are prevented with stoppage of said pin, and a position in which said fabric and/or netting can be wound. <IMAGE></p> |
