JPH0416593B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a method for horizontally supporting a plurality of slats by means of ladder-like support cords near both ends of the slats and, if necessary, at an intermediate position therebetween. This invention relates to a slat used in a so-called horizontal blind, which is equipped with a lifting cord for lifting and lowering.

[Background of the Invention] Horizontal blinds generally include a plurality of slats spaced apart vertically by ladder-like support cords near each end of the slats and, if necessary, at one or more locations in between. The slats are supported horizontally by the ladder-like support cord, and by moving the vertical cord portions at the front and rear of the ladder-like support cord relatively up and down, the slats can be tilted to adjust the light shielding. A lifting cord is passed vertically through the insertion hole, its lower end is fixed to a lower plate placed at the lower end of the row of slats, and the lifting cord is wound upward or lowered to raise or lower the slats. It is configured to open and close the blinds.

As mentioned above, the above-mentioned elevating cord has the function of controlling the elevating and lowering of the slats, and because it extends vertically through the elevating cord insertion hole provided at the same position on each slat, it also controls the horizontal movement of each slat. It also plays the role of regulating the slats and aligning a large number of slats in the vertical direction.

However, in the structure of the conventional horizontal blind as described above, when the slats are tilted to a vertical position, outside light leaks into the room through the elevating cord insertion hole, impairing the light-shielding function of the blind.
Furthermore, it is not desirable in terms of the appearance of the blind that a large number of elevating cord insertion holes are visible over the entire surface of the blind when the blind is closed.
In addition, in the conventional structure where the lifting cord passes through the lifting cord insertion hole provided in each slat, when the slat is tilted, the edge of the lifting cord insertion hole of each slat hits the lifting cord. There is also the problem that the tilting action of the slat is limited and therefore the slat cannot be tilted to a completely vertical position. In the horizontal blind of the above type, the lifting cord insertion hole that was conventionally provided in the center of the slats has been eliminated to prevent outside light from leaking when the slats are tilted, and to prevent external light from leaking into the slats. In order to form a horizontal blind that is excellent in terms of performance, and in which the slats can be tilted to a completely vertical position, the applicant of the present invention has proposed that the slats should be supported by ladder-like support cords near both side edges. A small hole is formed through which the middle cord of the ladder-like support cord can be inserted freely, and a width approximately equal to or slightly narrower than the diameter of the middle cord extends from each small hole to the corresponding side edge. We have proposed a blind in which a guide slot is formed that opens at the edge, and a guide ring is provided on the ladder-shaped support cord to guide the lifting cord.
(Utility Application No. 61-18938) [Problem to be solved by the invention] As mentioned above, small holes are provided on both sides of the slat through which the middle cord of the ladder-like support cord can be inserted, and the slat is inserted through these small holes. A blind with a structure in which a guide slot leading to the side edge is formed and the lifting cord is placed outside the side edge of the slat allows the slat to be easily attached to and detached from the ladder-shaped support cord, and is particularly useful for blinds. In the assembled state, it is easy to attach and detach only the desired slats, and since there is no large elevating cord insertion hole in the center of the slats unlike conventional slats, there is no light leakage when the blind is closed. Excellent in appearance,
Although it has many advantages, such as the ability to tilt the slats to a fully vertical position, it has been found that there are significant drawbacks. If a small hole through which a ladder-shaped support cord is inserted and a cord guide slot leading to the hole are provided near both side edges of the slat, the effective width of the slat will be larger than that of the slat at the position where the small hole and slot are provided. This is because the width of the slat is narrower than the width of the slat, and therefore the bending strength and rigidity of the slat in the longitudinal direction are lower in this part than in other parts.

Generally, in horizontal blinds, if the slats are suddenly stopped midway through their descent, the portions of the slats that are not supported by the middle cords of the ladder-like support cords, that is, the longitudinal ends of the slats and the support cords, will be damaged. The slats generally tend to bend in a wavy manner as the sections between the support cords move downward due to inertia. In particular, since there is no support cord at the end of the slat in its longitudinal direction, there is a tendency for the slat to bend at the middle cord of the support cord that supports the weight of the slat. However, as mentioned above, in the above-mentioned blinds in which the slats are provided with small insertion holes and guide slots through which the middle cord of the support cord is inserted, the bending strength and rigidity of these parts are reduced, so the slats are When the slat suddenly stops descending, both ends of the slat bend sharply, and if this operation is repeated, the part of the slat where the small holes and slots are formed will become locally fatigued, causing the small holes to bend. Cracks develop inward from the slat, and the slat eventually breaks at this point.

[Purpose of the invention]

The present invention solves the above-mentioned drawbacks in a slat for blinds in which the slat main body has no holes by providing small holes on both side edges of the slat through which the middle cord of the ladder-like support cord is inserted and slots for guiding the middle cord. It is an object of the present invention to provide a slat for a blind which prevents the slat from cracking and breaking at the portion where the small holes and guide slots are provided.

[Means for solving problems]

The present invention, as a means to solve the above-mentioned problems, supports a plurality of slats horizontally by means of ladder-like support cords near both ends of the slats and, if necessary, at an intermediate position, and In a slat used for a blind, in which a lifting cord for raising and lowering the slat is attached to the vertical cord part of the ladder-shaped support cord outside one side edge of the slat, the position to be supported by the ladder-shaped support cord is At least one small hole is formed near both side edges of the slat through which the middle stage of the ladder-like support cord can be freely inserted, and a guide groove hole extends from each small hole to the corresponding side edge and opens at the side edge. To provide a slat for a blind, characterized in that a step portion for reinforcing the slat having a length larger than the diameter of the small hole is formed at a position close to the center of the slat of the small hole. It is something.

〔Example〕

The following description will be made based on the embodiments shown in the drawings.

FIG. 13 is a front view showing an example of a blind using the slats of the present invention. In the figure, 1 is a head box, 2 is a lower plate, 3 is a slat, 4 is a ladder-like support cord, 5 is a lifting cord, and 6 is a rotation. The control stick is shown.

In the blind using the slat of the present invention, a plurality of blinds 3 are horizontally supported near both ends by ladder-like support cords 4, 4, and the upper ends of the ladder-like support cords are attached to a rotating drum (see Fig. (not shown), and this rotating drum is connected via a rotating shaft, a transmission gear, etc. (not shown),
It is rotated by a rotary operation mechanism (a rotary operation rod in the illustrated case) 6 hanging from the head box 1, and the vertical cord portions of the ladder-like support cords 4, 4 are moved up and down relative to each other, thereby tilting the slat. It's getting old.

On the other hand, the lower end of the lift cord of the blind is fixed to the lower plate 2 placed at the lowest part of the slat group, and the ladder-like support cord 4 is attached to the outside of one side edge of the slats.
The cord is guided upward through the lifting cord insertion ring 7 formed on one side of the vertical cord portion of the cord, is introduced into the head box 1, and is led out of the head box 1 again from near one end of the head box 1 via a suitable stopper device. The lift operation section 9 is designed to be

A first embodiment of the slat according to the invention is shown in FIGS. 1-4. FIG. 1 is a perspective view showing the state in which the slat of the present invention is used. In the figure, 4a and 4b indicate the vertical cord portions before and after the ladder-like support cord, 4c indicates the middle cord, and the lifting cord insertion ring 7 is vertical. It is provided in the cord portion 4a.

The ladder-like support cords 4, 4 are attached to the slat 3.
There are small holes 10 near both side edges of the position supported by the
10 are provided. The small holes 10, 10 are large enough to allow the middle cord portion 4c of the ladder-like support cord 4 to pass through freely, and a guide groove hole 11 is provided that extends from the small hole 10 to the side edge of the slat and opens at the side edge. ing.

As mentioned above, as the blind opens and closes, the small hole 1
In order to prevent cracks from running inward from 0 and causing the slat to break at 0, the slat according to the present invention has a small hole located near the center of the slat from the above-mentioned small hole. A slat stiffening step 12 having a length greater than the diameter is provided.

In the embodiment shown in FIGS. 1-4, the step 12 is formed as a U-shaped step surrounding the small hole 10, which extends toward the upper surface of the slat as shown in FIG. It is formed in a convex shape.

If such a stepped portion 12 is formed, even if the slat is repeatedly raised and lowered as described above and suddenly stopped in the middle of descent, the force will be concentrated at the line connecting the small holes 10. Since the slat does not bend significantly in this part, and the slat bends in a curved manner, local fatigue in this part is prevented. Also,
In the conventional type, as mentioned above, as the slat is repeatedly moved up and down, cracks 13 are generated from the small holes 10 toward the inside of the slat, as shown in FIG. 5, and this causes the slat to break. In the slat of the present invention shown in Figs. 1-4, as shown in Fig. 6,
It has been experimentally confirmed that even if a crack 13 occurs, it will propagate along the stepped portion 12 as shown by 13a, and breakage of the slat can be avoided.

The above embodiment shows a configuration in which the slat 3 is convex toward the upper surface, that is, the stepped portion 12 protrudes from the curved side of the slat, which is slightly curved upward in an arc shape when viewed in cross section. It has been confirmed that this can achieve the great effect described above, but it has also been experimentally confirmed that almost the same effect can be achieved even if the stepped portion is made to protrude to the opposite side. Ta. Such an embodiment is shown in FIGS. 7 and 8.

In FIGS. 7 and 8, reference numeral 12 indicates a stepped portion that is convex toward the lower surface as described above.

Further, such a stiffening step portion can also be formed in a circular shape surrounding the small hole 10. Such an embodiment is shown in FIGS. 9 and 10. In the figure, 1
2 is a circular stepped portion.

Furthermore, the above-mentioned stiffening step does not necessarily have to be arcuate, and may be linear to achieve the purpose of stiffening and reinforcing the slat. Such an embodiment is shown in Figures 11-12. In the figure, reference numeral 12 indicates a straight reinforcing step portion which is convex on the lower side of the slat 3.

〔Effect of the invention〕

Since the slat of the present invention has the above-described structure, a stepped portion is provided inward from the position where the small hole and the guide groove hole are provided, and this portion is stiffened and reinforced, so that when the slat is lowered, the slat Even if you suddenly stop the slats, the slats do not bend at an acute angle using the middle cord as a fulcrum, but bend in a gentle curve over the length of the step, thus preventing fatigue from concentrating on the narrow part of the slats. can. Also,
Even if a crack occurs inward from the small hole for inserting the middle cord, the crack will stop at the step, and instead of moving straight ahead, it will change direction and grow along the step. As a result, the slats can be prevented from being cut and the slats can be made durable.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the state of use of the first embodiment of the slat for blinds according to the present invention, FIG. 2 is a plan view of the slat shown in FIG. 1, and FIG.
FIG. 4 is an enlarged plan view of the small hole portion of the slat shown in the figure, FIG. 5 is a plan view showing the state of crack occurrence in a conventional slat, and FIG.
The figure is a plan view showing the occurrence of cracks in the slat of the present invention, Figures 7 and 8 are front views and sectional views of the small hole portion showing the second embodiment of the present invention, and Figures 9 and 10 are 11 and 12 are a plan view and a sectional view showing a fourth embodiment of the present invention, and FIG. 13 is a plan view and a sectional view showing a slat according to the present invention. It is a front view of the blind to which it is applied. 1...Head box, 2...Lower plate, 3...Slat, 4...Ladder-like support cord, 5...Elevating cord, 6
...Rotation operation mechanism, 7...Elevating cord insertion ring, 9...
Lifting operation section, 10... Small hole for middle stage insertion, 11... Guide groove hole, 12... Step portion.

Claims (1)

[Claims] 1. A plurality of slats are horizontally supported by ladder-like support cords near both ends of the slats and, if necessary, at an intermediate position, and a lifting cord for raising and lowering the slats is connected to one side edge of the slats. In a slat used for a blind attached to the vertical cord portion of the ladder-shaped support cord on the outside, a ladder-shaped support cord is attached near both side edges of the slat at at least one of the positions to be supported by the ladder-shaped support cord. A small hole through which the middle cord can be freely inserted is formed, and a guide groove extending from each small hole to the corresponding side edge and opening at the side edge is formed, and a guide groove hole is formed near the center of the slat of the small hole. A slat for a blind, characterized in that a slat-stiffening stepped portion having a length larger than the diameter of the small hole is formed at a position.