Patent ID: 6955207
Filing Date: 2005-10-18
Classification: E06B

Abstract:
1. A friction device for roll-up curtains comprising a tubular roller ( 1 ) on which a curtain ( 2 ) rolls up, a threaded shaft located along a horizontal axis of the tubular roller which is rotatably carried on the horizontal axis, the threaded shaft ( 9 ) situated axially inside said roller ( 1 ) and connected to the roller ( 1 ) by interposition of an angular speed reducer group ( 4 ); a body ( 11 ) mounted slidingly and axially inside said roller ( 1 ) and screw-coupled with said threaded shaft ( 9 ), so as to translate axially due to the rotation of shaft ( 9 ) during unrolling or rolling up of said curtain ( 2 ) on said roller ( 1 ); at least one elastic member ( 12 ) which is tightened on opposite ends thereof, between abutment means ( 13 ) and a surface disposed on said shaft ( 9 ), to determine, due to the pressure or counter-thrust to which the elastic member is subjected, a friction effect, which varies as a function of the rotation direction of said roller ( 1 ), said elastic member ( 12 ) including a plurality of balls ( 21 ) of elastic material, bored along a diametric axis, and set on said shaft ( 9 ) close to each other.