| 摘要 |
A roller screen unit including an outer sleeve, an intermediate sleeve loosely received in the outer sleeve, a core member loaded with an elongated spiral spring and received in the intermediate sleeve, a clutch mechanism connected to one end of the core member in association with the outer sleeve and a screen member wound around the outer roller sleeve is disclosed. The clutch mechanism includes a stator member and a rotator member turnably mounted on the stator member through one or more ball members to perform a function of the clutch on operation of the unit.
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