LADDER STRAP STRUCTURE INSTALLABLE ON HIGH/LOW RAIL

A ladder strap structure installable on high/low rail includes two vertical straps, multiple horizontal straps and a polygonal control drum. Multiple perforations are formed on the vertical straps at equal intervals. A securing bolt is passed through the perforations of the vertical straps to secure the ladder strap on the polygonal control drum. By means of selecting the perforations positioned at different heights, the ladder strap can be secured on the polygonal control drum according to the height of the high/low blind rails so that the application range of the ladder strap is widened.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a ladder strap structure installable on high/low rail, and more particularly to a ladder strap structure, in which the vertical straps are formed with multiple perforations positioned at different heights. By means of selecting the perforations positioned at different heights, the ladder strap can be secured on the polygonal control drum according to the requirement of the high/low blind rails.

2. Description of the Related Art

Conventionally, a ladder strap is securely connected with the polygonal control drum in such a manner that the polygonal control drum is formed with two opposite slots and the ladder strap is wound over the polygonal control drum and then passed through the slots. The passing end of the ladder strap is knotted to secure the ladder strap. However, according to such securing manner, the ladder strap bears the total weight of all the blind slats so that the knot of the ladder strap is quite easy to loosen and detach from the polygonal control drum. Moreover, it is hard to control the size and length of the knot so that the length of the ladder strap is hard to control. Especially, when the ladder strap is applied to a high/low blind rail, it is harder for the conventional means to secure the ladder strap to a proper position and it is impossible to control the length of the ladder strap to suit the high or low blind rail.

SUMMARY OF THE INVENTION

It is therefore a primary object of the present invention to provide a ladder strap structure installable on high/low rail, in which the vertical straps are formed with multiple perforations positioned at different heights. According to the requirement of arrangement of the high/low blind rails, the perforations positioned at different heights on the ladder strap can be selected. In cooperation with the securing holes of the polygonal control drum, a securing bolt can be used to secure the ladder strap on the polygonal control drum for operating and rotating the blind slats. The ladder strap structure is applicable to both a high rail and a lower rail.

To achieve the above and other objects, the ladder strap structure installable on high/low rail of the present invention mainly includes two vertical straps, multiple horizontal straps and a polygonal control drum. Multiple perforations are formed on the vertical straps at equal intervals. The horizontal straps are connected with the two vertical straps for securely connecting with the blind slats. The polygonal control drum is a hexagonal drum body or an octagonal drum body. Two opposite outer plane faces of the drum body are formed with two through holes corresponding to the perforations of the vertical straps. A securing bolt can be inserted through the perforations of the vertical straps into the through holes of the polygonal control drum to secure the vertical straps on the polygonal control drum, whereby the ladder strap can be controlled to ascend or descend.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer toFIGS. 1, 2 and 3. The ladder strap structure of the present invention includes two vertical straps1,10, multiple horizontal straps2connected between the two vertical straps1,10and a polygonal control drum3. The two vertical straps1,10are formed with multiple perforations11,12arranged at equal intervals or unequal intervals (as shown inFIG. 2). The body30of the polygonal control drum3is formed with through holes31corresponding to the perforations11,12. A securing bolt32includes a tray body and an engagement shank section extending from the center of the tray body. The engagement shank section of the securing bolt32is passed through the perforations11,12and the through hole31to secure the vertical straps1,10on the polygonal control drum3. The horizontal straps2are connected between the two vertical straps1,10at equal intervals for connecting with the blind slats4. Accordingly, by means of rotating the polygonal control drum3, the vertical straps1,10can be controlled to ascend or descend so as to drivingly turn the blind slats (as shown inFIGS. 3 and 4).

When installed (as shown inFIG. 5), the ladder strap structure is securely disposed on the polygonal control drum3. Then a quadrangular bar5is fitted through and connected with the polygonal control drum3. Then the polygonal control drum3is placed on a fixing seat6. The fixing seat6is connected in a blind rail7. The two vertical straps1,10are passed through the blind rail7and suspended from the blind rail7. The horizontal straps2are connected with the respective blind slats4to form a blind control assembly (as shown inFIG. 6).

Please now refer toFIG. 7, which shows another embodiment of the polygonal control drum3of the present invention. In this embodiment, the polygonal control drum3is a hexagonal roller drum8. The slope sides80of the hexagonal roller drum8are formed with through holes81for securely connecting with the ladder strap structure. The securing bolts82are used to integrally connect the ladder strap structure with the hexagonal roller drum8(as shown inFIG. 8).

Please now refer toFIGS. 9 to 12. By means of rotating the quadrangular bar83, the hexagonal roller drum8is driven and rotated to control the ladder strap for turning the blind slats4so as to achieve sunshade effect.

Please now refer toFIGS. 13 and 14, which show another embodiment of the horizontal straps of the present invention. In this embodiment, loop straps9are secured to lower sides of the perforations11,12of the vertical straps1,10. The loop straps9are passed through the perforations91formed on the blind slat90and the vertical straps1,10are passed through the interior of the loop straps9, whereby the vertical straps1,10are secured with the blind slat90to prevent the blind slat90from shaking (as shown inFIGS. 15 and 16).

Please now refer toFIG. 17, which shows still another embodiment of the horizontal straps of the present invention. In this embodiment, loop straps94are secured between two perforations92,93of the vertical straps1,10. The vertical straps1,10are connected with the polygonal control drum via the perforations92. The loop straps94are passed through the perforations of the blind slat and the vertical straps1,10are passed through the interior of the loop straps94, whereby the vertical straps1,10are securely connected with the blind slat4.