JP2004169473A - Blind - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blind having a function for preventing loosening of a light adjusting cord and also capable of making its prevention function impossible at need. <P>SOLUTION: This blind is constituted in such a way that an upper end of a first shading member is attached to a head box, and an upper end of a second shading member is attached to an intermediate bar attached to a lower end of the first shading member. One end of an elevating cord suspended from the head box so as to elevate is attached to a lower end of the second shading member, and one end of the modulated light cord suspended from the head box so as to elevate is attached to the intermediate bar. The lower end of the second shading member rises and lowers by raising and lowering one end of the elevating cord, and the intermediate bar rises and lowers by raising and lowering the modulated light cord to change ratio of exposure of the first shading member and the second shading member. This blind is provided with a loosening regulation means 40 for detecting loosening of the modulated light cord 32 and regulating rising operation of one end of the elevating cord when detecting loosening and a change-over switch 50 switched to regulate operation of the loosening regulation means 40 or release the regulation. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a blind having a first shielding material and a second shielding material, and more particularly, to a blind in which light control cords are loosened.
[0002]
[Prior art]
As a conventional blind, an upper end of a first shielding member is attached to a head box, and an upper end of a second shielding member is attached to an intermediate bar attached to a lower end of the first shielding member. It is known that a shielding material is arranged in two stages above and below. As the first shielding material and the second shielding material, for example, a pleated screen is used. One end of a lifting / lowering cord hanging down from the head box is attached to the lower end of the second shielding member, and one end of the dimming cord hanging up / down from the head box is attached to the intermediate bar. The lower end of the second shielding member is raised and lowered by raising and lowering the lifting code, and the intermediate bar is raised and lowered by raising and lowering the dimming code. The material exposure ratio is changed.
[0003]
With the first shielding material in the upper stage being exposed to some extent, the lifting cord is raised and raised sequentially from the lower end of the second shielding material. As the intermediate bar rises, the dimming cord is loosened and folded. There is a problem that the first shielding material hangs down (also referred to as "dandruff") between the inserted first shielding members, which is not preferable in design.
[0004]
In view of this, the present applicant has proposed, in Patent Literature 1, an invention capable of preventing a light control code from hanging down. The invention described in Patent Document 1 is provided with slack detecting means for detecting slack in the dimming code. When the slack detecting means detects slack in the dimming code, the lifting operation of one end of the elevating cord is restricted. ing.
[0005]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-115474
[Problems to be solved by the invention]
Patent Literature 1 is very effective because it can prevent the slack of the dimming code. However, if the slack of the dimming code is detected, the lifting operation of the raising / lowering cord is always restricted. Its function may be an obstacle. For example, it is difficult to make the dimming code slack-free at the time of maintenance such as replacing the code, but in such a case, it is inconvenient if the raising / lowering cord cannot be raised. In addition, when a user unfamiliar with the operation uses the light control cord and restricts the operation of raising and lowering the lifting cord, forcibly continuing the operation may cause a failure.
[0007]
The present invention has been made in view of such problems, and an object of the present invention is to provide a blind that has a function of preventing slack of a dimming code and, if necessary, can disable the prevention function. is there.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a head box in which an upper end of a first shielding member is attached to a head box, and an upper end of a second shielding member is attached to an intermediate bar attached to a lower end of the first shielding member. One end of a lifting cord suspended from the box is attached to the lower end of the second shielding member, one end of the light control cord suspended from the head box is attached to the intermediate bar, and one end of the lifting cord is moved up and down. The lower end of the second shielding member is raised and lowered by moving the light control cord, and the intermediate bar is raised and lowered by raising and lowering the dimming code so that the exposure ratio between the first shielding material and the second shielding material changes. A slack restricting means for detecting a slack of the light control cord and restricting the raising operation of one end of the elevating cord when the slack is detected, and restricting the operation of the slack restricting means. Others characterized in that it is provided with disabling the switching means is switched in order to control release.
[0009]
When the slack of the light control cord is detected, the lifting operation of the lifting cord is restricted by the slack restricting means, so that the blind rises while the light control cord is loose and the first shielding member is folded. It is possible to prevent a situation in which the light control code is dandruff. Then, the blind rises without slack in the light control cord, so that the light control code does not drip from between the first shielding members. Thus, a function of preventing the light control cord from being loosened can be provided. Further, by restricting the operation of the slack restricting means by the disabling switching means, it is possible to easily disable the function of preventing the light control cord from being loosened as required. Further, by switching the disabling switching means and releasing the restriction on the operation of the slack restricting means, the function of preventing the slack of the light control cord can be restored again.
[0010]
According to a second aspect of the present invention, the other end of the lifting cord according to the first aspect is connected to a winding device provided in the head box so as to be able to be wound and unwound. When the slack is detected, the slack restricting means is approached to prevent the winding of the winding apparatus by approaching the winding apparatus. Is regulated. The slack restricting means restricts the winding of the winding device, thereby restricting the raising operation of one end of the elevating cord to prevent the dimming code from loosening, and the disabling switching means causes the winding of the slack restricting means to wind. By blocking access to the device, the ability to prevent loosening can be disabled.
[0011]
As means for regulating the winding of the winding device, for example, a ratchet that is attached so as to be able to rotate integrally with the winding device and has ratchet teeth, and a ratchet tooth that can be engaged with the ratchet teeth when the light control cord is loosened. The disabling switching means can be constituted by a switching member movable in parallel with the moving direction of the stopper member. When the switching member disables the function of preventing loosening, the switching member moves to a position where the movement of the stopper member is prevented. When the function of preventing the loosening is restored, the switching member moves to a position where the movement of the stopper member is not prevented. Good to do.
[0012]
According to a third aspect of the present invention, in the first or second aspect, the disabling switching means can be switched from outside the head box. Thereby, in a state where the blind is attached to the window frame, the wall surface, or the like, the function of easily preventing loosening can be disabled or restored as needed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
1 to 4 are views showing a blind according to the embodiment of the present invention. In the figure, reference numeral 10 denotes a head box, which is fixed to a window frame, a wall surface, or the like by a bracket 11. The upper end of an upper screen 14 as a first shielding member is attached to the head box 10. An intermediate bar 18 is attached to a lower end of the upper screen 14, and an upper end of the lower screen 16, which is a second shielding member, is attached to the intermediate bar 18. The lower end of the lower screen 16 is a weight bar 20. Each of the upper screen 14 and the lower screen 16 is formed of, for example, a pleated screen that can be folded in a zigzag shape.
[0015]
An elevating cord 22 is suspended from the head box 10 so as to be able to ascend and descend. One end of the elevating cord 22 is inserted into each fold of the upper screen 14, the intermediate bar 18 and each fold of the lower screen 16, and is connected to the weight bar 20. Is done. The other end of the lifting / lowering cord 22 is connected to a rotatable rotatably supported take-up pipe 24 in the head box 10 so as to be wound and unwound. A winding shaft 26 is connected to one end (the right end in FIG. 1) of the winding pipe 24 so as to rotate integrally therewith. The winding shaft 26 is connected to a pulley (not shown) via a control unit 28. Have been. An operation code 30 is wound around the pulley, and the operation code 30 is hung from one end of the head box 10 (the right end in FIG. 1). These winding pipe 24, winding shaft 26 and control unit 28 constitute a winding device.
[0016]
Similarly, a light control cord 32 is suspended from the head box 10 so as to be able to move up and down. One end of the light control cord 32 is inserted into each fold of the upper screen 14 and connected to the intermediate bar 18. The other end of the light control cord 32 is turned in the head box 10 and extends along the longitudinal direction of the head box 10, and the other end of the head box 10 (FIG. 1) The head box 10 is led out from the left end of the head box, and is hung down and connected to the operation knob 36.
[0017]
In the head box 10, a slack restricting means 40 for detecting the slack of the light control cord 32 and restricting the rotation of the winding pipe 24 is provided. As shown in FIGS. 5 to 7, the slack restricting means 40 is wound around the case 42 fixed in the head box 10 and outside the winding pipe 24 so as to be integrally rotatable with the winding pipe 24. A ratchet 44 fitted on the outer peripheral surface of the pipe 24, a stopper 46 slidable in a direction substantially parallel to the rotation direction of the ratchet 44 in the case 42, and a spring 48 as an elastic body for urging the stopper 46 And An insertion passage 46a is formed in the stopper 46, and the light control cord 32 passes through the insertion passage 46a. A large number of ratchet teeth 44 a are formed on the outer peripheral surface of the ratchet 44, and teeth 46 b that can mesh with the ratchet teeth 44 a of the ratchet 44 are formed on the stopper 46.
[0018]
The stopper 46 is urged by a spring 48 in a direction in which the stopper 46 comes into contact with the side surface of the case 42. As shown in FIG. 9, when the teeth 46 b of the stopper 46 mesh with the ratchet teeth 44 a of the ratchet 44, It prevents rotation in one direction. The rotation of the ratchet 44 in one direction corresponds to the rotation of the elevating cord 22 of the winding pipe 24 in the winding direction.
[0019]
In the normal state where the light control cord 32 shown in FIGS. 5 to 7 is not loosened, the teeth 46 b of the stopper 46 separate from the ratchet 44 against the urging force of the spring 48 due to the tension of the light control cord 32. It is positioned in such a position.
[0020]
Below the looseness restricting means 40, a changeover switch 50 as disabling switching means capable of restricting or releasing the operation of the loosening restricting means 40 is provided. The changeover switch 50 is fitted in a concave groove 42 a formed on the lower side of the case 42 and is slidably disposed in parallel with the stopper 46. At the center of the changeover switch 50, a regulating protrusion 50a projecting into the case 42 is formed. The restricting projection 50a is inserted into a concave groove 46c formed on the lower surface of the stopper 46, and serves to restrict the movement of the stopper 46. As shown in FIG. 8, the changeover switch 50 is movable between the restriction position and the restriction release position in the concave groove 42a. A small concave portion 50b is formed on a side portion of the changeover switch 50, and a small convex portion 42b that fits with the corresponding concave portion 50b is formed in each concave groove 42a corresponding to the restriction position and the restriction release position. Have been.
[0021]
As shown in FIG. 8, when the changeover switch 50 is at the regulation release position, the regulation protrusion 50a of the changeover switch 50 is separated from the wall surface of the stopper 46 in the concave groove 46c of the stopper 46 as shown in FIG. Thus, the stopper 46 is at a position where the stopper 46 does not prevent the ratchet 44 from approaching. On the other hand, as shown in FIG. 12, when the changeover switch 50 is at the restricting position, the restricting projection 50a of the changeover switch 50 is inserted into the concave groove 46c of the stopper 46 as shown in FIG. The stopper 46 is in a position where it comes into contact with the wall surface 46d of the stopper 46c to prevent the stopper 46 from approaching the ratchet 44.
[0022]
The upper end of the upper screen 14 is attached to the bottom surface of the portion of the head box 10 where the changeover switch 50 is disposed via a screen stopper plate (not shown), but a part of the screen stopper plate is opened. The changeover switch 50 can be moved from the outside to the above-mentioned regulation position and the regulation release position by operating the changeover switch 50 using a tool as needed.
[0023]
The operation of the blind configured as described above will be described. First, in the state shown in FIG. 1, the lifting cord 22 is almost completely unwound from the winding pipe 24, and the weight bar 20 is at the lowermost end. The other end of the light control cord 32 is led out of the head box 10 to some extent, and the intermediate bar 18 is at an intermediate height in the vertical direction. Therefore, the upper screen 14 and the lower screen 16 have substantially the same exposure ratio.
[0024]
From this state, when the operation knob 36 at the other end (the left end in FIG. 1) of the head box 10 is grasped to release the stopper 34 and move downward or upward, one end of the light control cord 32 is moved upward or downward. To raise or lower the intermediate bar 18. In accordance with the movement of the intermediate bar 18, the exposure ratio between the upper screen 14 and the lower screen 16 changes, and the screen with the smaller exposure ratio is folded down from below by that much.
[0025]
Now, it is assumed that the changeover switch 50 is at the regulation release position as shown in FIG. In a state where the upper screen 14 is not completely folded and is exposed at a certain exposure ratio as shown in FIG. When rotated in the direction, the weight bar 20 rises. As the weight bar 20 rises, the lower screen 16 is first folded from below, and when the lower screen 16 is completely folded, the intermediate bar 18 then rises. As the intermediate bar 18 rises, the upper screen 14 is folded from below. At this time, the light control cord 32 supporting the intermediate bar 18 is slackened. Accordingly, the stopper 46, which has been regulated by the slack regulating means 40 to be separated from the ratchet 44 by the dimming cord 32, does not receive tension from the dimming cord 32, so that the stopper 46 is slid by the spring 48, As shown in FIG. 9, the teeth 46b of the stopper 46 mesh with the ratchet 44. As a result, the winding pipe 24 can no longer rotate in the winding direction of the elevating cord 22, and the raising operation of the blind is forcibly stopped.
[0026]
In order to release the stop, the operation knob 36 is operated to release the stopper 34 and lower it. When the one end of the light control cord 32 moves upward, the intermediate bar 18 is raised. Then, the upper screen 14 is completely folded. As a result, the slack of the light control cord 32 is eliminated, and the tension acts again, so that the teeth 46b of the stopper 46 of the slack restricting means 40 are separated from the ratchet 44, and the winding pipe 24 becomes rotatable again. Therefore, when the operating pipe 30 is rotated in the winding direction of the elevating cord 22 by operating the operation cord 30, the weight bar 20 is raised and the upper screen 14 and the lower screen 16 are folded. Since the light control cord 32 is not loosened in the folded state, the light control cord 32 does not drip from the folded upper screen 14 and does not deteriorate the appearance.
[0027]
As another procedure, as shown in FIG. 3, the operation cord 30 is operated from a state where the intermediate bar 18 is completely raised, and the winding pipe 24 is rotated in the winding direction of the lifting cord 22. Then, when the weight bar 20 reaches the intermediate bar 18, the raising operation of the blind ends, so that the blind can be raised without operating the slack restricting means 40.
[0028]
The engagement between the ratchet teeth 44a of the ratchet 44 and the teeth 46b of the stopper 46 restricts only the rotation of the winding pipe 24 in the winding direction of the elevating cord 22, and does not affect the rotation of the elevating cord 22 in the unwinding direction. Since no restriction is imposed, even if the light control cord 32 becomes loose when the blind descends, the rotation of the winding pipe 24 is not restricted.
[0029]
On the other hand, the restriction of the lifting operation of one end of the lifting cord 22 by the loosening control means 40 is rather troublesome at the time of maintenance such as code replacement, and therefore, as shown in FIGS. Operate from outside to move to the restricted position. Accordingly, for example, even when the light control cord 32 is loosened or the light control cord 32 is disassembled and removed, the stopper 46 is prevented from moving by the restricting projection 50a of the changeover switch 50, so that the stopper 46 moves. Because it is not possible, the stopper 46 does not mesh with the ratchet 44, and thus the winding pipe 24 can rotate in the winding direction. After the maintenance is completed, the function of preventing loosening can be restored by moving the changeover switch 50 to the restriction release position again. Alternatively, if the user does not want to operate the slack prevention function, the changeover switch 50 can be kept at the regulation release position.
[0030]
As described above, by operating the changeover switch 50 from the outside of the headbox 10 between the restriction position and the restriction release position, the loosening prevention function can be easily disabled as necessary.
[0031]
【The invention's effect】
As described above, according to the present invention, the function of preventing the slack of the light control cord can be simply disabled as necessary by restricting the operation of the slack restricting means by the disabling switching means. it can. Further, by switching the disabling switching means and releasing the restriction on the operation of the slack restricting means, the function of preventing the slack of the light control cord can be restored again.
[Brief description of the drawings]
FIG. 1 is a front view of a blind according to an embodiment of the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a front view showing a state in which an intermediate bar has risen from the state of FIG. 1;
FIG. 4 is a side view of FIG. 3;
FIG. 5 is a cross-sectional view showing the slack restricting means and the disabling switching means, taken along line 5-5 in FIG. 1;
FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;
FIG. 7 is a plan view of a main part of the slack restricting means of FIG.
FIG. 8 is a view showing the slack restricting means and the disabling switching means as viewed from the direction of arrow 8 in FIG. 5;
FIG. 9 is a diagram corresponding to FIG. 5, showing a state in which the slack restricting means is operated.
FIG. 10 is a plan view of a main part of the slack restricting means of FIG. 9;
11 is a diagram corresponding to FIG. 5, showing a state in which the slack restricting means is disabled.
FIG. 12 is a view showing the slack restricting means and the disabling switching means as viewed from the direction of arrow 12 in FIG. 11;
[Explanation of symbols]
10 Head box 14 Upper screen (first shielding material)
16 Lower screen (second shielding material)
18 Intermediate bar 22 Lifting cord 24 Winding pipe 32 Dimming cord 40 Looseness control means 50 Changeover switch (disabling changeover means)

Claims (3)

The upper end of the first shielding member (14) is attached to the head box (10), and the upper end of the second shielding member (16) is attached to an intermediate bar (18) attached to the lower end of the first shielding member (14). One end of a lifting / lowering cord (22) vertically suspended from the head box (10) is attached to the lower end of the second shielding member (16), and a light control cord (32) vertically suspended from the head box (10). Is attached to the intermediate bar (18), and the lower end of the second shielding member (16) is raised and lowered by raising and lowering one end of the lifting cord (22), and the light control cord (32) is raised and lowered. As a result, in the blind where the exposure ratio of the first shielding member (14) and the second shielding member (16) is changed such that the intermediate bar (18) moves up and down,
A slack restricting means (40) is provided for detecting the slack of the light control cord (32) and for restricting the raising operation of one end of the elevating cord (22) when the slack is detected. A blind provided with a disabling switching means (50) that is switched to regulate or release the operation. The other end of the lifting cord (22) is connected to a winding device (24) provided in the head box (10) so as to be able to be wound and unwound, and the slack restricting means (40) detects slack. When this occurs, it approaches the winding device (24) to prevent winding of the winding device (24), and the disabling switching means (50) controls the approaching movement of the slack restricting means (40). The blind according to claim 1, wherein the operation of the slack restricting means (40) is restricted by blocking. The blind according to claim 1 or 2, wherein the disabling switching means (50) can be switched from outside the head box (10).

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