发明名称 ROLLER SHADE WITH A COUNTERBALANCING DEVICE
摘要 A roller shade including a flexible sheet member having opposite parallel first and second edges, and a roller shaft rotatable in each of two opposite directions of rotation. The flexible sheet member being attached along its first edge to the roller shaft, while the second edge of the flexible sheet member is freely depending from the roller shaft. The roller shade further comprises a counterbalancing device for balancing a portion of the flexible sheet member that is unwound from the roller shaft. This counterbalancing device has means for storing a variable torque that is complementary to a variable weight of the portion of flexible sheet member that is depending from the roller shaft. The means for storing variable torque includes a helically wound tension spring operatively interposed between a stationary central rod and the roller shaft.
申请公布号 US2015047795(A1) 申请公布日期 2015.02.19
申请号 US201314380890 申请日期 2013.02.27
申请人 Hunter Douglas Industries B.V. 发明人 Bohlen Jorg;Koop Lars
分类号 E06B9/56;E06B9/42 主分类号 E06B9/56
代理机构 代理人
主权项 1. Roller shade including a flexible sheet member having opposite parallel first and second edges, a roller shaft rotatable in each of two opposite directions of rotation, the flexible sheet member being attached along its first edge to the roller shaft in a longitudinal direction thereof, the second edge of the flexible sheet member being freely depending from the roller shaft, so as to define a raised position of the roller shade in which the flexible sheet member is fully wound about the roller shaft and a lowered position in which the flexible sheet member is fully unwound from the roller shaft, the roller shade further comprising a counterbalancing device for balancing a portion of the flexible sheet member that is unwound from the roller shaft, the counterbalancing device having means for storing a variable torque complementary to a variable weight of the portion of flexible sheet member that is depending from the roller shaft, wherein the variable torque stored in the means for storing variable torque prevents rotation of the roller shaft due to the variable weight of the portion of flexible sheet member depending from the roller shaft in any position between the fully wound and the fully unwound position and increasing as the second edge of the flexible sheet member is lowered, and wherein the means for storing variable torque includes a helically wound tension spring.
地址 Rotterdam NL
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