JP2000274165A - Ladder cord and slat angle adjusting apparatus for horizontal blind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely rotate all slats up to the vertical position when the slats are totally closed, by making the elongation strength of one wrap stronger then the elongation strength of the other warp. SOLUTION: A ladder cord 11 is formed by knitting filament thread formed, for instance, of artificial fibers like a ladder, and stretching two wefts 13 across a pair of warps 12a, 12b in multiple stages at regular intervals. The warp 12a is formed by knitting two pieces of twine 14a, 14b which each are formed by twining three pieces of filament yarn, and the other warp 12b is formed by knitting two pieces of twine 15a, 15b which each are formed by twining two pieces of filament yarn, whereby the elongation strength of the warp 12a is made higher than that of the warp 12b. Therefore, multi-stage slats are supported on the wefts 13 of the ladder cord 11, and when the warp 12a is pulled up by a slat angle adjusting apparatus to rotate the respective slats until they are totally closed, all the slats can be surely rotated up to a vertical position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ladder cord for supporting a slat of a horizontal blind.

[0002]

2. Description of the Related Art As shown in FIG.
A plurality of slats 3 are supported on a ladder cord 2 suspended from a head box 1, and a bottom rail 4 is suspended from the lower end of the ladder cord 3.

[0003] The upper end of the ladder cord 2 is supported by a slat angle adjusting shaft (not shown) in the head box 1, and the slat angle adjusting shaft operates, for example, an operating rod suspended from one side of the head box. Is driven to rotate.

When the operating rod is operated to rotate the slat angle adjusting shaft, the slats 3 are adjusted in phase with the ladder cord 2 in the same phase. The ladder code 2
In order to suspend and support the slats 3 and the bottom rail 4, it is necessary to keep the required strength and to make the warp thin so as not to degrade the aesthetic appearance of the horizontal blind. Therefore, the warp yarns 5a and 5b of the ladder cord 2 are configured by knitting a plurality of yarns in a cord shape.

[0005]

In the above-mentioned horizontal blind, in order to tilt the slats 3 in the vertical direction to the fully closed state, the slat angle adjusting shaft is rotated and one of the warps of the ladder cord 2 is rotated. 5a is pulled up.

Then, in the upper part of the ladder code 2,
While one warp yarn 5a is pulled upward, the other warp yarn 5b is slackened, and the slat 3 is rotated substantially vertically.

However, since the warp yarns 5a and 5b formed by knitting in the form of a cord tend to be elongated, as shown in FIG. Since the pulling force acting on 5a is weakened and cannot be sufficiently pulled upward, and the weight of each slat 3 acts on the other warp yarn 5b, the slat 3 is not rotated to the vertical direction.

Therefore, even if the slat 3 is rotated to the fully closed state, the lower slat 3 cannot be surely rotated to the vertical direction, so that unnecessary external light leaks into the room or privacy is secured. There is a problem that cannot be done.

An object of the present invention is to provide a slat when fully closed.
It is an object of the present invention to provide a rudder code of a horizontal blind which can surely rotate all slats to a vertical direction.

[0010]

According to the present invention, the elongation strength of one warp is higher than the elongation strength of the other warp.

According to a second aspect of the present invention, the warp yarn is formed by knitting a twisted yarn, and the elongation strength of the twist yarn constituting the one warp yarn is higher than the elongation strength of the twist yarn constituting the other warp yarn. According to the third aspect, the twisted yarn changes its elongation strength by changing the number of yarns constituting the twisted yarn.

[0012] In claim 4, the warp is formed by knitting a twisted yarn, and the number of twisted yarns constituting the one warp is determined by:
The number of twisted yarns constituting the other warp was larger than the number of twisted yarns. According to a fifth aspect, the ladder cord according to any one of the first to fourth aspects supports a plurality of slats by the weft thread, and the ladder cord is suspended from a slat angle adjusting device in a head box.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A ladder cord 11 shown in FIG. 1 is formed, for example, by knitting a filament yarn of a chemical fiber in a ladder shape and forming a pair of warp yarns 12a and 12b.
Between them, many stages of weft yarns 13 are stretched two by two at equal intervals.

One of the warp yarns 12a and 12b is formed of two twisted yarns 14a and 14b formed by twisting three filament yarns of 250d × 3 × 2, that is, 250d (d = denier). Is formed by knitting.

The other warp yarn 12b is formed by knitting two twisted yarns 15a and 15b formed by twisting two filament yarns of 250d × 2 × 2, that is, 250d. The weft yarn 13 is woven into the warp yarns 12a and 12b.

In the ladder cord 11 configured as described above, since the number of filament yarns constituting each of the twisted yarns constituting the warp yarns 12a and 12b is different, the strength against elongation is higher in the warp yarn 12a than in the warp yarn 12b. I have.

With the horizontal blind using the ladder code 11 as described above, the following operational effects can be obtained. (1) As shown in FIG. 2, the weft 13 of the ladder cord 11
When the slats 3 are supported on multiple stages and the warp yarns 12a are pulled up by the slat angle adjusting device, the slats 3 are rotated. Since the warp yarn 12a has high elongation strength, the warp yarn 12a is reliably pulled up over its entire length, and
2b has a low elongation strength, and therefore extends downward based on the weight of each slat 3. As a result, when each slat 3 is rotated to the fully closed state, it is surely rotated until all the slats 3 are substantially vertical.

(2) In the state shown in FIG.
If a is set to the indoor side and this horizontal blind is installed such that the convex surface of the slat 3 is located on the outdoor side, it is possible to reliably block external light and to ensure privacy.

(3) When the warp 12b is pulled up by the slat angle adjusting device, each slat 3 can be rotated in the direction opposite to the direction shown in FIG. (Second Embodiment) The ladder code 16 shown in FIG.
Similarly to the first embodiment, a pair of warp yarns 17a and 17b is formed by knitting a filament yarn of a chemical fiber in a ladder shape.
Between them, the multi-stage weft yarns 18 are stretched two by two at equal intervals.

Of the warp yarns 17a and 17b, one of the warp yarns 17a is formed by twisting two filament yarns of 250d × 2 × 2, that is, 250d (d = denier). Is formed by knitting.

The other warp yarn 17b is formed by knitting a single twisted yarn 20 formed by twisting two filament yarns of 250d × 2 × 1, that is, 250d. The weft yarn 18 is woven into the warp yarns 17a and 17b.

In the ladder cord 16 configured as described above, since the number of each of the twisted yarns constituting the warp yarns 17a and 17b is different, the warp 19a has a strength against elongation that is equal to the warp yarn 19b.
It is higher than.

The horizontal blind using such a ladder code 16 can provide the same operation and effect as the first embodiment. The above embodiment can be modified as follows. -By knitting a core material having a low expansion rate into the warp yarn 12a, the elongation strength of the warp yarn 12a may be increased. When performing a heat treatment for suppressing the expansion and contraction rate on the warp yarns 12a and 12b, the elongation strength of the warp yarn 12a may be made higher than that of the warp yarn 12b by adjusting the temperature and the number of times of the heat treatment. -By knitting the warp yarns 12a and 12b with twisted yarns of different materials, the elongation strength of the warp yarn 12a may be made higher than that of the warp yarn 12b. -The warp yarn may be composed of tape-shaped narrow woven fabrics having different elongation strengths. Means for providing a difference in the elongation strength of each warp include changing the width of the warp, coating the warp on one side with a synthetic resin, impregnating the warp on one side with a synthetic resin, and the like. -The ladder code may be composed of a synthetic resin film. As a means to differentiate the elongation strength of each warp,
The width of the film constituting the warp is changed, and the warp on one side is formed by laminating a plurality of films.

[0024]

As described in detail above, the present invention can provide a ladder cord of a horizontal blind which can surely rotate all the slats to the vertical direction when the slats are fully closed.

[Brief description of the drawings]

FIG. 1 is an enlarged view showing a ladder code according to a first embodiment.

FIG. 2 is a side view showing a horizontal blind.

FIG. 3 is an enlarged view showing a ladder code according to the second embodiment.

FIG. 4 is a side view showing the operation of a conventional horizontal blind.

[Explanation of symbols]

 11 Ladder code 12a, 12b, 17a, 17b Warp

Claims (5)

[Claims] 1. A ladder cord for a horizontal blind, wherein the elongation strength of one warp is higher than the elongation strength of the other warp. 2. The warp yarn is formed by knitting a twisted yarn, and the elongation strength of the twisted yarn constituting the one warp yarn is higher than the elongation strength of the twisted yarn constituting the other warp yarn. The ladder code of the described horizontal blind. 3. The ladder cord of a horizontal blind according to claim 2, wherein the twisted yarn changes the elongation strength by changing the number of yarns constituting the twisted yarn. 4. The warp yarn according to claim 1, wherein the warp yarn is formed by knitting a twist yarn, and the number of twist yarns constituting the one warp yarn is larger than the number of twist yarns constituting the other warp yarn. Ladder code for horizontal blinds. 5. A ladder cord according to claim 1, wherein a plurality of slats are supported by the weft thread, and said ladder cord is suspended from a slat angle adjusting device in a head box. Slat angle adjustment device for horizontal blinds.