| 摘要 |
A friction device for rolling up curtains and the like includes a tubular roller ( 1 ), on which a curtain ( 1 a) is wound. The roller ( 1 ) is rotatably carried by a support ( 10 ) and a threaded stem ( 2 ) is situated axially inside the roller ( 1 ) and carries, mounted thereon by a screw coupling, an operative body ( 3 ), likewise situated inside the roller ( 1 ). The operative body ( 3 ) translates axially with respect to the threaded stem ( 2 ) during motion of the curtain ( 1 a) from a rolled up configuration (A) to a unrolled configuration (B). Elastic blocks ( 41, 51 ) push on the operating body ( 3 ) to produce a friction effect on the operating body and transmitted to roller ( 1 ) during curtain ( 1 a) transition between the unrolled and rolled up configurations, thus allowing operation of the curtain in a substantially balanced way during rolling up and/or unrolling. Stop nuts ( 40, 50 ) are fastened to the threaded stem ( 2 ) for compressing the elastic blocks against surfaces of the operating body ( 3 ).
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