Invention Grant
US09404303B2 Chain winder for a window or door 有权
用于窗户或门的链条卷绕机

Chain winder for a window or door
Abstract:
The present invention relates to a chain winder which has a casing, a chain housed at least partially within the casing and extension means operable to cause the chain to extend out from the casing and also to retract back into the casing. The chain winder also includes a clutch mechanism which is operable to allow the chain to be extended out from the casing, or retracted back into the casing, without operating the extension means.
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