E FIXED CONSTRUCTIONS
E06 DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
E06B FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
E06B9/00 Screening or protective devices for; wall or similar; openings, with or without operating or securing mechanisms; Closures of similar construction
E06B9/24 Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance;; Slat blinds
E06B9/26 Lamellar or like blinds, e.g. venetian blinds
E06B9/28 with horizontal lamellae, e.g. non-liftable
E06B9/32 Operating, guiding, or securing devices therefor
E06B9/322 Details of operating devices, e.g. pulleys, brakes, spring drums, drives