| 摘要 |
A spring tensioning device (100) comprises a housing defining a body (102), a drum (104) rotatably mounted on the body (102) for rotation about a rotation axis (106), a cord (108) and a constant tension spring (110). The cord 108 has a leading part (112) (shown schematically in phantom lines) for attachment to blind fabric deployed from the roller blind, and a trailing part (114) which in an initial configuration is wound around the drum (104). The trailing part (114) is configured to unwind from the drum (104) when in use as the drum (104) rotates in a first direction (120) about the rotation axis (106). The constant tension spring (110) is mounted on the body (102) and is configured to apply a near-constant resilient bias to the drum (104) when the drum rotates in the first direction (120), urging the drum (104) to rotate in a second direction, opposite to the first direction (120), about the rotation axis (106). The constant tension spring (110) is mounted alongside the drum (104), spaced in a radial direction "R" from the rotation axis (106) of the drum (104). |
