US 2008/0302489 A1Published application

Curtain body positioning control structure for the window curtain

OwnerMing-Lu WONGinventor

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Abstract

The present invention relates to a kind of curtain body positioning control structure for the window curtain, there is a shaft extruding from the side fixing base of such window curtain coupling with the bead-chain driving mechanism, locking device and fixing base respectively, wherein the said locking device consisting of top push block and locking block, thereat the combination of locking device with locking block is maintaining an elastic condition, due to such locking block is pushed against a spring, in addition, said fixing base is connected to the said locking device with rolling beads particularly, and in this way while such window curtain is being opened or closed by means of bead-chain driving mechanism, a gap between the said locking device and said shaft will be formed with the spring action thereto and hence reducing lots of detent force accordingly, therefore it has an advantage of easy operation; when the curtain is stopping operation, the locking device would be swiveled reversely as well as drawn downwardly by the gravity force of such window curtain, and hence resulting in a various separation distance of the rolling beads which is caused by the displacement of said rolling beads, and under this circumstance a cone hole inside the said locking device will be pushed forwardly to tightly slip onto the said shaft and hence preventing such window curtain from falling downwardly with a locking effect thereof.

A curtain body positioning control structure for a window curtain comprises:

a washer of a fixing block;
a spring;
a plurality of rolling beads;
a fixing base comprising a shaft, wherein central portion of said shaft has a cylinder structure, and in addition, there is a screw hole formed at front surface of said cylinder structure;
a bead-chain driving mechanism comprising multiple bead-chain retaining grooves formed at its periphery, wherein a through hole is positioned at central area for receiving said shaft, and wherein there are driving blocks formed at corresponding position of said through hole;
a locking device comprising a top push block and a locking block, wherein there are driving grooves formed at both sides of the said top push block of said locking device, which is connected with said driving blocks of said bead-chains driving mechanism and also movable all together at the same time;
wherein said locking block comprising locking block retaining grooves for said rolling beads and an internal cone hole;
a curtain fixing base, comprising concave structures applicable for contacting with said bead-chain driving mechanism via said driving blocks, a space in central portion suitable for retaining said locking device, and curtain fixing base retaining grooves for said rolling beads;
wherein said locking block retaining grooves and said curtain fixing base retaining grooves of said rolling beads has a concave arc gutter structure;
wherein said rolling beads are installed in-between said locking block retaining grooves and said curtain fixing base retaining grooves;
wherein front end of said washer of said fixing block locks said spring onto front end of said locking block, which allowing said locking block being flexibly pushed forward and causing said cylinder structure being coupled tightly onto said internal cone hole;
which then causing said fixing base and said curtain fixing base being fastened tightly.

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Abstract

Claims8