JP2000130052A - Lifting device for sunshade material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting device for a sunshade material which can easily restrain a change of the material caused by the lifting motion depending on the load difference of the weight of the sunshade material acting on the lifting cord moving up and down the sunshade material and a lifting load acting on the lifting cord. SOLUTION: In a lifting device for a sunshade material lifting up the sunshade material in accordance with a rotary torque in the winding-up direction of a lifting cord, imparted to a lifting cord-winding shaft by a spring, a constant load spring 17 is wound on the lifting cord-winding shaft 11 to impart a constant rotary torque regardless of rise or fall of the sunshade material, and a conical pulley 12 changing in steps is attached to the lifting cord-winding shaft 11 so that the slanting angle of the outer peripheral face becomes acute in sequence from a small diameter side to a large diameter side, and a lifting cord 16 is wound on the conical pulley 12, and the lifting cord 16 is wound off from the small diameter side of the conical pulley 12 to the large diameter side when the material is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device for elevating and lowering a solar shading material such as a horizontal blind slat, a tuck-up curtain or a pleated curtain.

[0002]

2. Description of the Related Art In a horizontal blind, a ladder cord suspended from a head box has a plurality of slats suspended and supported, and the slats are raised and lowered by raising and lowering a bottom rail via a lifting cord. In such a horizontal blind, as the slats are lowered, that is, as the bottom rail is lowered, each slat is sequentially supported by the ladder cord from the upper slat, so that the weight of the slat acting on the lifting cord is gradually reduced. I do.

[0003] In the lift-up curtain, a curtain cloth is suspended from a head box, and a lower end of a lifting cord is connected to a lower end of the curtain cloth. Then, the curtain fabric is raised and lowered by raising and lowering the lower end portion of the curtain fabric via the lifting cord. In such a lift-up curtain, as the curtain fabric is lowered, the curtain fabric is suspended from the upper portion and is sequentially supported by the head box, so that the weight of the curtain fabric acting on the elevating cord decreases gradually.

In the pleated curtain, the curtain fabric is suspended and supported from a head box, and the curtain fabric is raised and lowered by raising and lowering a bottom rail via a lifting cord. In such a pleated curtain, as the curtain fabric is lowered, the curtain fabric is suspended from the upper portion and supported by the head box, so that the weight of the curtain fabric acting on the elevating cord decreases gradually.

[0005] Some of the above-mentioned horizontal blinds, lift-up curtains or pleated curtains are provided with a lifting auxiliary device or an automatic winding device of a lifting code. The lifting / lowering assist device is configured so that a lifting / lowering load proportional to the weight of the solar shading material such as slats or curtain cloth acting on the lifting / lowering cord always acts on the lifting / lowering cord, and operates the bottom rail or the lower edge of the curtain cloth. Accordingly, the solar shading material can be moved up and down with an extremely small operation force, and the solar shading material can be held at a desired position after the elevating operation.

[0006] The automatic hoist of the lifting cord is configured such that the lifting load of the lifting aid is always larger than the weight of the solar shading material acting on the lifting cord by a predetermined value or more. The cord windup shaft is rotated in the hoisting cord hoisting direction to wind up the hoisting cord, and the solar shading material is automatically pulled up.

FIG. 7 shows a first conventional example of a vertical blind lifting / lowering assisting device. A conical pulley 2 having a constant inclination angle is fitted on a lifting cord winding shaft 1 rotatably supported in a head box (not shown).
The elevating cord 3 is wound around the outer peripheral surface. When the elevating cord winding shaft 1 is rotated in the elevating cord winding direction, the elevating cord 3 is wound from the large diameter side of the conical pulley 2 to the small diameter side.

A constant load spring 4 made of spirally wound spring steel is rotatably supported in the vicinity of the elevating cord winding shaft 1, and the tip of the constant load spring 4 is connected to the elevating cord winding shaft 1. Is wound around a pulley 5 fitted to the pulley.

The constant load spring 4 includes a lifting cord winding shaft 1.
Is rotated from the pulley 5 by the rotation of the lifting cord in the winding direction, and is wound on the pulley 5 by the rotation of the lifting cord winding shaft 1 in the lifting and lowering direction. The constant load spring 4 applies a constant rotational torque to the lifting cord winding shaft 1 in the lifting cord winding direction regardless of the winding amount on the pulley 5.

[0010] In the lifting assist device constructed as described above, as shown in FIG. 8, as the lifting cord 3 is rewound and the slat is lowered, the slat weight W1 acting on the lifting cord 3 decreases linearly. The lifting load W2a for pulling up the lifting cord 3 by the constant load spring 4 also decreases. The lifting load W2a is set so as to always exceed the slat weight W1.

FIG. 9 shows a second conventional example of a lifting assist device. A normal pulley 6 is fitted to the lifting cord winding shaft 1 rotatably supported in the head box, and the lifting cord 3 is wound around the outer peripheral surface of the pulley 6. When the elevating cord winding shaft 1 is rotated in the elevating cord winding direction, the elevating cord 3 is wound around the pulley 6.

A variable load spring 7 formed by spirally winding spring steel is rotatably supported in the vicinity of the elevating cord winding shaft 1. The tip of the variable loading spring 7 is connected to the elevating cord winding shaft 1. Is wound around a pulley 5 fitted to the pulley.

The variable load spring 7 includes a lifting cord winding shaft 1.
Is rotated from the pulley 5 by the rotation of the lifting cord in the winding direction, and is wound on the pulley 5 by the rotation of the lifting cord winding shaft 1 in the lifting and lowering direction. And FIG.
0 (a), the constant load spring 4 has the same width at the distal end and the proximal end of the spring steel.
Is formed so as to become narrower toward the base end portion, and as it is wound on the pulley 5, the elevating cord winding shaft 1
It is configured such that the rotational torque applied to is reduced.

Therefore, in such a lifting assist device, as shown in FIG. 11, as the lifting cord 3 is rewound and the slat is lowered, the slat weight W1 acting on the lifting cord 3 decreases linearly and changes. The lifting load W2b for pulling up the lifting cord 3 by the load spring 7 also decreases linearly.

A third conventional example using a variable load spring 8 shown in FIG. 12 (b) in place of the variable load spring 7 of the second conventional example has also been proposed. That is, as shown in FIG. 12A, the constant load spring 4 has the same free curvature at the distal end and the proximal end of the spring steel, whereas the variable load spring 8 is free toward the proximal end. It is formed so as to have a small curvature, and is configured such that the rotational torque applied to the elevating cord winding shaft 1 decreases as the winding is wound on the pulley 5.

With this configuration, as shown in FIG. 11, as the slat is lowered, the slat weight W1
At the same time, the lifting load W2b also decreases linearly.

[0017]

In the first conventional example, since the inclination angle of the conical pulley 2 is constant, at the initial stage of the slat lowering operation, the lifting and lowering of the conical pulley 2 with respect to the descending distance of the slat is performed. The change in the winding diameter of the cord 3 is large, and as the slat is lowered, the change in the winding diameter of the lifting cord 3 with respect to the descending distance of the slat becomes small.

Then, the damping rate of the lifting load W2a decreases as the slat is lowered, and the lifting load W2a acting on the lifting cord 3 decreases in a quadratic curve with respect to the slat descent distance. Therefore, as the slat is lowered, the load difference D between the slat weight W1 and the lifting load W2a increases.

Therefore, when used as a lifting assistance device,
As the slat is lowered, the balance between the slat weight W1 and the lifting load W2a is lost. As a result, when the slat is lowered to near the lower limit, a braking device is required to prevent the slat from rising due to the lifting load W2a, or when the slat is raised from the middle portion, the braking device smoothly moves up. Are hindered.

Further, when used as an automatic hoisting device for the lifting cord, there is a problem that the winding speed of the lifting cord changes depending on the lowering position of the slat. In the second conventional example, by forming the spring steel so as to become narrower toward the base end, the variable load spring 7 having such a characteristic that a lifting load W2b as shown in FIG. Since it is extremely difficult to form, the slat weight W
There is a problem that the load difference D between the load 1 and the lifting load W2b cannot be made sufficiently small.

In the third prior art variable load spring 8,
Although the rotation torque is damped by changing the free curvature of the spring steel, the weight of the slat acting on the lifting cord decreases from 1/3 to 1/5 before the slat descends from the upper limit to the lower limit. On the other hand, the rotational torque of the variable load spring 8 can be reduced only to about 1/2.

Therefore, similarly to the first conventional example, as the slat is lowered, the slat weight W1 and the lifting load W
There is a problem that the load difference D with respect to 2b becomes large.

An object of the present invention is to easily change the weight difference between the weight of the solar shading material acting on the elevating cord for elevating and lowering the solar shading material and the elevating load applied to the elevating cord with the elevating operation of the solar shading material. It is an object of the present invention to provide an elevating and lowering device for a solar shading material which can be suppressed.

[0024]

According to the first aspect of the present invention, a solar shading material is suspended from a head box, and a lifting cord is suspended from a lifting cord winding shaft rotatably supported in the head box. The lower end of the elevating cord is connected to the lower end of the solar shading material, and the solar shading material can be pulled up based on the rotational torque in the elevating cord winding direction applied to the elevating cord winding shaft by a spring. In the material elevating device, a constant load spring is wound around the elevating cord winding shaft to apply a constant rotation torque regardless of the elevating and lowering of the solar shading material. Attach a conical pulley that changes in a plurality of steps so that the inclination angle becomes steep sequentially from the smaller diameter side to the larger diameter side, wind the elevating cord around the conical pulley, and the elevating cord is Wherein the small-diameter side of the cone pulley to be rewound toward the large diameter side at the time of falling.

According to a second aspect of the present invention, a variable load spring is wound around the elevating cord winding shaft to apply a rotating torque that decreases as the solar shading material descends. Attaching a conical pulley with a constant inclination angle of the surface, winding the lifting cord around the conical pulley,
The lifting cord is rewound from the small diameter side to the large diameter side of the conical pulley when the solar shading material is lowered.

According to a third aspect of the present invention, a variable load spring is wound around the elevating cord winding shaft to apply a rotating torque that decreases as the solar shading material descends. Attaching a conical pulley that changes in a plurality of stages so that the inclination angle of the surface is gradually increased from the smaller diameter side to the larger diameter side, and winding the elevating cord around the conical pulley, the elevating cord is When the solar shading material is lowered, the conical pulley is rewound from the small diameter side to the large diameter side.

According to a fourth aspect of the present invention, the variable load spring changes a free curvature from a base end to a front end, thereby changing a rotational torque applied to the elevating cord winding shaft.

According to a fifth aspect of the present invention, the inclination angle of the outer peripheral surface of the conical pulley is changed in three stages so as to be gradually steep from the small diameter side to the large diameter side of the conical pulley.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows a first embodiment of a horizontal blind lift assisting device. A conical pulley 12 is fitted on the elevating cord winding shaft 11 rotatably supported in a head box (not shown), and the outer peripheral surface of the conical pulley 12 has an inclination angle of 3 degrees.
It is configured so as to change to a step and to become steep sequentially from the small diameter side to the large diameter side. In this embodiment, the inclination angle of the intermediate portion 14 is formed the same as that of the first conventional example, and the small-diameter portion 13 is formed with a gentler inclination angle than the intermediate portion 14,
The large diameter portion 15 is formed with a steeper inclination angle than the intermediate portion 13.

An elevating cord 16 is wound around the outer peripheral surface of the conical pulley 12. And the elevating cord winding shaft 11
Is rotated in the elevating cord winding direction, the elevating cord 1
6 is wound from the large diameter side to the small diameter side of the conical pulley 12.

A constant load spring 17 formed by spirally winding spring steel is rotatably supported in the vicinity of the elevating cord winding shaft 11, and the tip of the constant load spring 17 is connected to the elevating cord winding shaft 11. Is wound around a pulley 18 fitted on the pulley 18.

The constant load spring 17 rotates the pulley 18 by the rotation of the lifting cord winding shaft 11 in the lifting cord winding direction.
And is wound on the pulley 18 by the rotation of the elevating cord rewinding shaft 11 in the elevating cord rewinding direction. The constant load spring 17 applies a constant rotational torque to the lifting cord winding shaft 11 in the lifting cord winding direction regardless of the winding amount on the pulley 18.

In the lifting assist device constructed as described above, as shown in FIG. 2, the slat weight W1 acting on the lifting cord 16 decreases linearly as the lifting cord 16 is rewound and the slat is lowered. .

Based on the rotation torque of the constant load spring 17,
The elevating load W3 acting on the elevating cord 16 via the conical pulley 12 decreases in a quadratic curve at the small-diameter portion 13, the intermediate portion 14, and the large-diameter portion 15 of the conical pulley 12, respectively.
The lifting load W3 is set so as to always exceed the slat weight W1.

In the lifting assistance device configured as described above,
The following operational effects can be obtained. (1) When the slat is lowered, the attenuation rate of the lifting load W3 with respect to the slat descent distance can be changed in three stages by the small diameter portion 13, the intermediate portion 14, and the large diameter portion 15 of the conical pulley 12. (2) Since the lifting load W3 can be reduced in the form of a quadratic curve at the small-diameter portion 13, the intermediate portion 14, and the large-diameter portion 15, the lifting / lowering cord 16 is connected to the small-diameter portion 13 and the large-diameter portion in the process of elevating the slat. The load difference D between the lifting load W3 and the slat weight W1 can be made smaller than that in the first conventional example in the range where the load is suspended from the portion 15. (3) The rotating torque of the constant load spring 17 and the conical pulley 1
Since the lifting load W3 can be set with three different inclination angles, the lifting load W3 having a small load difference D from the slat weight W1 can be set stably and easily. (Second Embodiment) FIG. 3 shows a second embodiment of a vertical blind auxiliary lift device. A conical pulley 19 having a constant inclination angle is fitted to the elevating cord winding shaft 11 rotatably supported in the head box.

An elevating cord 16 is wound around the outer peripheral surface of the conical pulley 19. And the elevating cord winding shaft 11
Is rotated in the elevating cord winding direction, the elevating cord 1
6 is wound from the large diameter side to the small diameter side of the conical pulley 19.

A variable load spring 20 similar to the third conventional example is rotatably supported near the lifting / lowering cord winding shaft 11, and the tip of the variable loading spring 20 is connected to the lifting / lowering cord winding shaft. It is wound around a pulley 18 fitted to 11.

The variable load spring 20 rotates the pulling cord 18 by rotating the lifting cord winding shaft 11 in the lifting cord winding direction.
And is wound on the pulley 18 by the rotation of the elevating cord rewinding shaft 11 in the elevating cord rewinding direction. The variable load spring 20 is configured such that the rotational torque applied to the elevating cord winding shaft 11 decreases as the variable load spring 20 is wound around the pulley 18.

In the lifting assist device configured as described above, as shown in FIG. 4, as the lifting cord 16 is rewound and the slat is lowered, the slat weight W1 acting on the lifting cord 16 decreases linearly. .

The rotational torque T of the variable load spring 20 acting on the elevating cord winding shaft 11 decreases as the slat is lowered. The rotation torque T of the variable load spring 20 is
The lifting load W is applied to the lifting cord 16 via the conical pulley 19.
Acts as 4.

Since the inclination angle of the conical pulley 19 is constant, in the initial stage of the slat lowering operation, the change in the winding diameter of the lifting cord 16 suspended from the conical pulley 19 with respect to the descending distance of the slat is large. Code for the slat's descent distance as it is lowered
The change in the winding diameter of the roller becomes small.

Then, the lifting load W4 becomes a value obtained by attenuating the rotational torque T of the variable load spring 20 in a quadratic curve. The lifting load W4 is set to be equal to or more than the slat weight W1.

In the lifting assistance device configured as described above,
The following operational effects can be obtained. (1) Since the lifting load W4 can be reduced from the rotational torque T of the variable load spring 20 in a quadratic curve, the rotational torque T of the variable load spring 20 until the slat falls from the upper limit to the lower limit is reduced by about 1 /. Even if it is reduced only to 2, the load difference D between the lifting load W4 and the slat weight W1 can be made smaller than in the third conventional example. (2) Since the lifting load W4 can be set by the rotation torque T of the variable load spring 20 having a changed free curvature and the inclination angle of the conical pulley 19, the lifting load with a small load difference D from the slat weight W1. W4 can be set stably and easily. (Third Embodiment) Fig. 5 shows a third embodiment of a vertical blind auxiliary lifting device. In this embodiment,
Instead of the conical pulley 19 of the second embodiment, a conical pulley 12 similar to that of the first embodiment is used, and the other configuration is the same as that of the second embodiment.

In the lifting assist device constructed as described above, as shown in FIG. 6, as the lifting cord 16 is rewound and the slat is lowered, the slat weight W1 acting on the lifting cord 16 decreases linearly. .

The rotation torque T of the variable load spring 20 acting on the elevating cord winding shaft 11 decreases as the slat is lowered. The rotation torque T of the variable load spring 20 is
The lifting load W is applied to the lifting cord 16 via the conical pulley 12.
Acts as 5.

The lifting load W5 is a value obtained by attenuating the rotational torque T in the form of a quadratic curve at the small-diameter portion 13, the intermediate portion 14, and the large-diameter portion 15 of the conical pulley 12. The lifting load W5 is set so as to always exceed the slat weight W1.

In the lifting assistance device configured as described above,
The following operational effects can be obtained. (1) The lifting load W5 is the rotational torque T of the variable load spring 20.
Can be set to values attenuated by three quadratic curves, so that as the slat is lowered, the lifting load W5 can be reduced more linearly than in the second embodiment. (2) Since the lifting load W5 can be reduced more linearly, the load difference D between the lifting load W5 and the slat weight W1 can be made smaller than in the second embodiment. (3) Since the lifting load W5 can be set by the rotation torque T of the variable load spring 20 having the changed free curvature and the inclination angle of the conical pulley 12, the lifting load with a small load difference D from the slat weight W1 is obtained. W5 can be set stably and easily.

Each of the above embodiments may have the following configuration. In the first and third embodiments, the conical pulley 1
The inclination angle of the outer peripheral surface of No. 2 may be two steps or four steps or more. The lifting assistance device of each of the above embodiments can be used for a pleated curtain or a lift-up curtain. -The lifting assistance device of each of the above embodiments can be used as an automatic winding device for a horizontal blind, a pleated curtain or a lift-up curtain. In this case, it may be set so that the load difference between the lifting load and the slat weight is always kept at a certain value or more. The clutch for holding the solar shading material at a desired position may be provided in the solar shading device provided with the lifting assistance device or the automatic hoisting device of each of the above embodiments. -The solar shading device provided with the lifting assistance device or the automatic hoisting device of each of the above embodiments may be provided with a damper device that regulates the elevating speed of the solar shading material to a predetermined value or less. The clutch device and the damper device may be provided in the solar shading device provided with the lifting assistance device or the automatic hoisting device of each of the above embodiments.

[0049]

As described above in detail, according to the present invention, the weight of the solar shading material acting on the elevating cord for raising and lowering the solar shading material and the lifting / lowering of the solar shading material differ from the lifting load applied to the elevating cord. It is possible to provide an elevating / lowering device for a solar shading material capable of easily suppressing a change accompanying an operation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment.

FIG. 2 is an explanatory diagram illustrating a load difference according to the first embodiment.

FIG. 3 is a perspective view showing a second embodiment.

FIG. 4 is an explanatory diagram showing a load difference according to the second embodiment.

FIG. 5 is a perspective view showing a third embodiment.

FIG. 6 is an explanatory diagram illustrating a load difference according to the third embodiment.

FIG. 7 is a perspective view showing a first conventional example.

FIG. 8 is an explanatory diagram showing a load difference of the first conventional example.

FIG. 9 is a perspective view showing a second conventional example.

FIG. 10 is an explanatory view showing a constant load spring of a first conventional example and a variable load spring of a second conventional example.

FIG. 11 is an explanatory diagram showing a load difference of the second conventional example.

FIG. 12 is an explanatory view showing a constant load spring of a first conventional example and a variable load spring of a third conventional example.

[Explanation of symbols]

 11 Elevating cord winding shaft 12, 19 Conical pulley 16 Elevating cord 17 Constant load spring 20 Variable load spring

Claims (5)

[Claims] 1. A solar shielding material is suspended and supported from a head box, a lifting cord is suspended from a lifting cord winding shaft rotatably supported in the head box, and a lower end of the lifting cord is connected to the solar shielding material. A solar radiation shielding material lifting and lowering device connected to a lower end portion and configured to be able to pull up the solar radiation shielding material based on a rotation torque in a lifting and lowering cord winding direction applied to the lifting and lowering cord winding shaft by a spring; A constant load spring is wound around the winding shaft to apply a constant rotation torque regardless of the elevation of the solar shading material,
A conical pulley that changes in a plurality of stages such that the inclination angle of the outer peripheral surface is gradually increased from the smaller diameter side to the larger diameter side is attached to the elevating cord winding shaft, and the elevating cord is wound around the conical pulley. The elevating / lowering device for a solar shading material, wherein the elevating cord is worn back from the small diameter side to the large diameter side of the conical pulley when the solar shading material is lowered. 2. A solar shading material is suspended and supported from a head box, an elevating cord is hung from a hoisting cord winding shaft rotatably supported in the head box, and a lower end of the elevating cord is connected to the solar shading material. A solar radiation shielding material lifting and lowering device connected to a lower end portion and configured to be able to pull up the solar radiation shielding material based on a rotation torque in a lifting and lowering cord winding direction applied to the lifting and lowering cord winding shaft by a spring; A variable load spring is wound around the winding shaft to apply a rotating torque that decreases with the lowering of the solar shading material. A conical pulley having a constant inclination angle of the outer peripheral surface is mounted on the lifting / lowering cord winding shaft. And the elevating cord is wound around the conical pulley, and the elevating cord is rewound from the small diameter side to the large diameter side of the conical pulley when the solar shading material is lowered. Lifting device insolation shielding material according to claim. 3. A solar shading material is suspended and supported from a head box, an elevating cord is hung from an elevating cord winding shaft rotatably supported in the head box, and a lower end of the elevating cord is attached to the solar shading material. A solar radiation shielding material lifting and lowering device connected to a lower end portion and configured to be able to pull up the solar radiation shielding material based on a rotation torque in a lifting and lowering cord winding direction applied to the lifting and lowering cord winding shaft by a spring; A variable load spring is wound around the winding shaft to apply a rotating torque that decreases with the lowering of the solar shading material. The inclination angle of the outer peripheral surface of the elevating cord winding shaft is changed from a small diameter side to a large diameter side. A conical pulley that changes in a plurality of steps so as to become steep in order toward the bottom is wound around the conical pulley, and the elevating cord is wound around the conical pulley when the solar shading material is lowered. Over lifting device of solar radiation shielding material, characterized in that from the small diameter side to be rewound toward the large diameter side of. 4. The variable load spring changes a free curvature from a base end portion to a front end portion, thereby changing a rotation torque applied to the elevating cord winding shaft. 4. The elevating and lowering device for a solar shading material according to any one of 2 to 3. 5. The inclination angle of the outer peripheral surface of the conical pulley is:
4. The solar radiation shielding apparatus according to claim 1, wherein the conical pulley is changed in three stages so that the diameter gradually increases from the smaller diameter side to the larger diameter side.