DUAL ROLL BLIND - WINTEC KOREA INC

Title:

DUAL ROLL BLIND

Document Type and Number:

WIPO Patent Application WO/2012/002656

Kind Code:

A3

Abstract:

The present invention relates to a dual roll blind enabling to control its light transmission amount and open and close with one ball-chain and to easily reset the roll screen. The dual roll blind comprises a first screen and a second screen having light transmission portions and light shielding portions, respectively, a first winding bar and a second winding bar for respectively winding the first screen and the second screen, a first gear for rotationally driving the first winding bar, a second gear for rotating the second windingbar with rotating dependently on the first gear, and a clutch hub, interposed between the second gear and the second winding bar, for transmitting rotational force of the second gear to the second winding bar, wherein the second gear comprises a gear protrusion protruding toward the clutch hub and the clutch hub comprises a clutch protrusion protruding toward the second gear to make contact with a portion of the gear protrusion for transmitting rotational force of the second gear to the clutch hub, and thegear protrusion and the clutch protrusion are not in contact with each other at a certain range of rotational angle in response to the rotational direction of the second gear to form a section where rotational force of the second gear is not transmitted to the clutch hub.

Inventors:

JANG SEONG-RYONG (KR)

Application Number:

PCT/KR2011/004350

Publication Date:

April 26, 2012

Filing Date:

June 14, 2011

Export Citation:

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Assignee:

WINTEC KOREA INC (KR)
JANG SEONG-RYONG (KR)

International Classes:

E06B9/42; E06B9/56

Foreign References:

JP2009138326A	2009-06-25
KR200444675Y1	2009-05-27
KR200398864Y1	2005-10-17
US4466475A	1984-08-21

Other References: