JP2000199390A - Elevating device for shield member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevating device for a shield member, which can reduce an elevation load which is exerted on an elevation cord when the shield member descents, and which is small-sized and inexpensive. SOLUTION: An elevation cord 7 suspended from a wind-up pulley 3 is connected at its lower end to the lower end of a shield member 6 which is suspended from a head box 1 so as to reduce the suspended weight of the shield member 5 as the latter descends, and the elevation cord 7 can be wound up by the wind-up pulley 3 by an elevating load obtained by a spring, overcoming the suspended weight. In this arrangement, the spring is an urging spring which can be accumulated with a force when the shield member 5 ascends. Further, load converting devices 9, 14, 15 which allow a gradient of variation in the suspended load to approximate to a gradient of variation in the elevation load caused by the descent of the shield member 5 are interposed between the urging spring 16 and the elevation cord 7.

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 slat of a horizontal blind, a curtain fabric of a tuck-up curtain or a curtain fabric of a pleated curtain, or a vertical folding type partition door.

[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 supported by the ladder cord sequentially from the upper slat, so that the suspended weight of the slat acting on the lifting cord is reduced. Decrease sequentially.

[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 sequentially suspended and supported by the head box from above, so that the hanging weight of the curtain fabric acting on the lifting cord is gradually reduced. I do.

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 sequentially suspended and supported by the head box from above, so that the suspended weight of the curtain fabric acting on the lifting cord is sequentially reduced. .

[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 aid is configured such that a lifting load proportional to the suspended weight of a shielding material such as a slat or curtain cloth acting on the lifting cord always acts on the lifting cord, and the operator operates the bottom rail or the lower edge of the curtain cloth. By directly operating, the shielding material can be moved up and down with an extremely small operation force, and the shielding material can be held at a desired position after the lifting operation.

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

JP-B-58-558 and JP-B-61
Japanese Patent No. 46696 describes an example of a lifting assist device using a constant load spring as a driving source.

[0008]

SUMMARY OF THE INVENTION In a lifting / lowering assisting device or an automatic hoisting device for a lifting / lowering cord using a constant load spring, a constant load spring and a pulley for winding the constant load spring are formed by a horizontal blind, a lifting curtain or a pleated curtain. Since the head box needs to be accommodated in the head box, there is a problem that the head box becomes large.

In addition, it is not easy to reduce the lifting load applied to the lifting cord in accordance with the suspended weight of the shielding material that decreases as the shielding material is lowered, and there is a problem that the cost increases.

An object of the present invention is to make it possible to reduce an elevating load applied to an elevating cord as the shielding material is lowered,
It is an object of the present invention to provide a small-sized and low-cost shielding material elevating device.

[0011]

According to the first aspect of the present invention, a shielding member is suspended from a head box, and a lifting cord is suspended from a winding pulley rotatably supported in the head box. The lower end is connected to the lower end of the shielding member so that the hanging weight of the shielding member acting on the lifting / lowering cord is reduced as the shielding member is lowered, and the lifting / lowering cord is connected via the winding pulley by a spring. A lifting / lowering device that enables the lifting / lowering cord to be wound around a winding pulley against the suspended weight based on a lifting / lowering load acting on the spring. A load converter configured to approximate the gradient of the change in the suspended weight and the gradient of the change in the elevating load due to the lowering of the shielding material. of It is interposed.

According to a second aspect of the present invention, the energy storage spring is constituted by a torsion coil spring, and the load converting device controls the output torque of the torsion coil spring by a plurality of pulleys whose winding diameter changes and a plurality of pulleys. The lifting load is transmitted to the take-up pulley via a transmission cord hung between the pulleys.

According to a third aspect of the present invention, the load converter comprises a conical drive pulley on which the output torque of the torsion coil spring acts, a conical transmission pulley rotatably supported by the head box, A transmission cord wound around the driving pulley and the transmission pulley, and the transmission cord is rewound from one of the driving pulley and the transmission pulley and wound up on the other, and one of the pulleys has a large diameter from a small diameter side. When rewinding or winding to the side,
The other pulley is configured to be wound or unwound from the large diameter side to the small diameter side, and a transmission device for transmitting the rotational torque of the transmission pulley to the winding pulley.

According to a fourth aspect of the present invention, the winding pulley is formed in a conical shape, and when winding the elevating cord, the winding pulley is wound from a large diameter side to a small diameter side.

According to a fifth aspect of the present invention, the transmission pulley is movably supported in a direction along a rotation axis of the driving pulley. In claim 6, a spiral groove around which the transmission cord is wound is formed on the outer peripheral surface of the transmission pulley and the drive pulley, and the spiral groove has a gradually increasing pitch from a small diameter side to a large diameter side of each pulley. The transfer cord winding position and the rewinding position of each pulley are moved at the same speed in the same direction.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows an elevation assisting device for a horizontal blind. Head box 1
A plurality of conical take-up pulleys 3 are supported on the elevating cord take-up shaft 2 rotatably supported in the shaft so as to be movable in the axial direction at a predetermined interval and to be relatively non-rotatable.

A spiral guide groove (not shown) is formed on the outer peripheral surface of the pulley 3, and an outer peripheral surface of a shaft 3a formed at the tip of the pulley 3 has the same pitch as the guide groove. Screws are engraved. The shaft 3a is screwed to a bearing 3b mounted in the head box 1. Therefore, when the lifting cord winding shaft 2 is rotated, the pulley 3 moves along the lifting cord winding shaft 2 while rotating.

A plurality of ladder cords 4 hanging from the head box 1 support a plurality of slats 5, and a bottom rail 6 is suspended from the lower end of the ladder cord 4. An angle adjusting device (not shown) for adjusting the angle of the slat 5 via the ladder cord 4 is provided in the head box 1.

An elevating cord 7 is inserted in the vicinity of the ladder cord supporting portion of the slat 5, the bottom rail 6 is attached to a lower end of the elevating cord 7, and an upper end of the slat 5 is wound inside the head box 1. It is wound around the guide groove of the pulley 3. When the elevating cord winding shaft 2 is rotated in the elevating cord winding direction, the elevating cord 7 is wound from the larger diameter side of the winding pulley 3 to the smaller diameter side.

A transmission shaft 8 is rotatably supported at one end of the head box 1, and a conical transmission pulley 9 similar to the winding pulley 3 is mounted on the transmission shaft 8 to move up and down the large diameter portion. The cord winding shaft 2 is supported so as to be movable in the axial direction with respect to the transmission shaft 8 but not to rotate relative thereto.

That is, as shown in FIG. 2, a square bar 10 is formed in the middle of the transmission shaft 8, and a square hole 11 is formed in the center of the transmission pulley 9 in which the square bar 10 can be inserted. Have been.

A bearing ball 12 is provided between the square bar 10 and the square hole 11 so that the transmission pulley 9
Are supported so as to be able to smoothly move in the axial direction with respect to the transmission shaft 8 and to be relatively non-rotatable.

A spur gear 17a is fitted to the end of the lifting cord winding shaft 2 on the transmission shaft 8 side, and a spur gear 17b is fitted to the end of the transmission shaft 8 on the lifting cord winding shaft 2 side. The two gears 17a and 17b are engaged with each other. Therefore, when the transmission shaft 8 is rotated, the lifting cord winding shaft 2 is rotated, and the transmission shaft 8 and the lifting cord winding shaft 2 are rotated in opposite directions.

A drive shaft 13 is rotatably supported at one end of the head box 1, and a conical drive pulley 1 similar to the transmission pulley 9 is provided at an end of the drive shaft 13.
4 is fitted with its small diameter portion as the lifting cord winding shaft 2 side.

A common transmission cord 15 is wound between the driving pulley 14 and the transmission pulley 9. When the transmission cord 15 is wound on the driving pulley 14, the transmission cord 15 is unwound from the transmission pulley 9 and transmitted. When it is wound on the pulley 9, it is rewound from the drive pulley 14.

When the lifting cord winding shaft 2 is rotated in the lifting cord winding direction, the transmission cord 15 is wound around the drive pulley 14. A torsion coil spring 16 is provided around the base end of the drive shaft 13. One end of the torsion coil spring 16 is fixed to the head box 1, and the other end is fixed to the drive shaft 13. .

Then, the lifting / lowering cord 7 is connected to the winding pulley 3
From the drive pulley 14
When rewinding, the torsion coil spring 16 is charged based on the rotation of the drive shaft 13, and when the lifting cord 7 is wound on the winding pulley 3, the torsion coil spring 16 is deenergized.

Also, as shown in FIG.
Is almost wound around the drive pulley 14,
When it is wound on the transmission pulley 9, the drive pulley 14
The difference in the winding diameter between the transmission pulley 9 and the transmission pulley 9
First moves in the direction of arrow A, then moves in the direction of arrow B, and reciprocates with respect to the transmission shaft 8.

Next, the operation of the lifting assist device constructed as described above will be described. The torsion coil spring 16
As shown in FIG. 3, the output torque T <b> 1 to the drive shaft 13 changes linearly by being charged or de-energized based on the rotation of the drive shaft 13. That is, when the drive shaft 13 is rotated in the direction of rewinding the transmission cord 15 from the drive pulley 14 (the direction of rewinding the lifting cord 7 from the take-up pulley 3), the torsion coil spring 16 is charged, The output torque T1 of the torsion coil spring 16 increases linearly in proportion to the rotation speed N of the drive shaft 13.

The output torque T1 of the torsion coil spring 16 is transmitted from the drive pulley 14 to the transmission pulley 9 in FIG.
Is transmitted as the load F1 shown in FIG. That is, the drive shaft 1
3, the transmission cord 15 is driven by the drive pulley 14
When the transmission cord 15 is unwound from the transmission pulley 9 and wound around the transmission pulley 9, the winding diameter of the transmission cord 15 unwound from the driving pulley 14 gradually increases, and the winding diameter of the transmission cord 15 wound around the transmission pulley 9 gradually increases. Decrease. Then
Due to the change in the winding diameter of the transmission pulley 14 and the transmission cord 15 of the transmission pulley 9, the load F1 is not proportional to the rotation speed N of the drive shaft 13, but gradually increases, and then converges to a constant value.

The load F1 transmitted to the transmission pulley 9 is
The torque is transmitted to the transmission shaft 8 as a torque T2 shown in FIG. That is, due to the change in the winding diameter of the transmission cord 15 around the transmission pulley 9, the torque T2 increases sharply at first based on the rotation speed N of the drive shaft 13, and then inversely proportional to the rotation speed N.
Decreases while drawing an arc.

The torque T2 transmitted to the transmission shaft 8 is transmitted to the lifting cord winding shaft 2 via the spur gears 17b and 17a, and the torque T2 is transmitted to the lifting cord 7 via the winding pulley 3 in FIG. It is transmitted as the lifting load F2 shown.

That is, the winding diameter of the lifting cord 7 hanging down from the winding pulley 3 gradually increases based on the rotation of the winding pulley 3 in the rewinding direction of the lifting cord 7, so that the lifting load F2 is reduced by the drive shaft. 13 decreases linearly in proportion to the rotation speed N of 13 or the descent distance D of the slat. The absolute value and gradient of the lifting load F2 with respect to the falling distance D are as follows:
It can be adjusted by changing the wire diameter of the torsion coil spring 16 and the inclination angles of the pulleys 3, 9, and 14.

In the horizontal blind provided with the above-described lifting assist device, when the bottom rail 6 is lowered to perform the lowering operation of the slats 5, the slats 5 are sequentially supported by the ladder cords 4 from the upper slats 5. The suspended weight of the slat 5 acting on 7 decreases linearly with the lowering of the bottom rail 6.

At this time, the lifting load F2 for pulling the lifting cord 7 upwardly decreases linearly with the lowering of the bottom rail 6. Accordingly, if the change in the suspended weight of the slat 5 acting on the lifting / lowering cord 7 during the lowering operation of the bottom rail 6 and the change in the lifting / lowering load F2 are matched, even if the bottom rail 6 is released at an arbitrary position, 6
Is held in that position.

When the bottom rail 6 is lifted, the lifting load F2 acting on the lifting cord 7 exceeds the suspended weight of the slat, so that the lifting cord 7 is taken up by the take-up pulley 3, and the bottom rail 6 Rises.

In the lifting assist device configured as described above,
The following operation and effect can be obtained. (1) It is accumulated with the descending operation of the slat 5,
The torsion coil spring 16 that increases the output torque T1
Can be used to reduce the lifting load F2 acting on the lifting cord 7 as the slat 5 is lowered. (2) By balancing the suspended weight of the slats 5 and the bottom rail 6 acting on the lifting / lowering cord 7 and the lifting / lowering load F2, the slats 5 can be held in a state of being raised and lowered to an arbitrary position. (3) By balancing the suspended weight of the slats 5 and the bottom rail 6 acting on the lifting / lowering cord 7 with the lifting / lowering load F2, the slats 5 can be raised / lowered with a slight operating force. (4) Since the torsion coil spring 16 can be used as a drive source for pulling up the slat 5, the headbox 1 can be reduced in size.
The cost of the lifting assistance device can be reduced. (5) The output torque T1 of the torsion coil spring 16 is transmitted to the transmission pulley 9 via the drive pulley 14, and the torque T2 transmitted to the transmission pulley 9 is transmitted to the winding pulley 3, and the winding pulley 3 And the pulleys 3, 9, and 14 are formed in a conical shape, so that the gradient of the lifting load F2 can be reduced.
Can be converted in a direction opposite to the gradient of the output torque T1. (Second Embodiment) FIG. 7 shows a second embodiment. This embodiment is a modification of the configuration of the transmission pulley 9 and the driving pulley 14 of the first embodiment, and the other configurations are the same as those of the first embodiment.

That is, the transmission shaft 8 is provided with a conical transmission pulley 21 having a large-diameter portion as the lifting cord winding shaft 2 side.
It is fitted to the transmission shaft 8 so that it cannot move in the axial direction and cannot rotate relatively.

The drive shaft 13 has a conical drive pulley 2
Reference numeral 2 designates the small diameter portion as the lifting cord winding shaft 2 side so as to be immovable in the axial direction and non-rotatable relative to each other. The transmission pulley 21 and the drive pulley 22 are disposed adjacent to each other.

The transmission pulley 21 and the driving pulley 2
2 are formed so that the diameters of both ends are 1: 2, and spiral grooves 23a and 23b are formed on the outer peripheral surface thereof, respectively.

The spiral grooves 23a and 23b are formed such that the pitch gradually increases from the smaller diameter side to the larger diameter side of each pulley 21, 22.
The ratio of the pitches of the spiral grooves 23a and 23b at both ends of 1: 2 is 1:
2 is formed.

The transmission pulley 21 and the driving pulley 22
And a common transmission cord 15 is wound between them, and when the transmission cord 15 is wound around the drive pulley 14,
When being unwound from the transmission pulley 21 and taken up by the transmission pulley 21, it is unwound from the drive pulley 22.

When the lifting cord winding shaft 2 is rotated in the lifting cord winding direction, the transmission cord 15 is wound around the drive pulley 22. Such a lifting assist device operates in the same manner as the first embodiment by lifting or lowering the bottom rail 6 in order to move the slat 5 up and down.

The transmission cord 15 is connected to the transmission pulley 2
When it is rewound from 1 and wound on the driving pulley 22, the winding diameter of the driving pulley 22 gradually decreases and the winding diameter of the transmission pulley 21 gradually increases, but the difference in the winding diameter is compensated for. Spiral groove 2 of each pulley 21, 22
Since the pitches of 3a and 23b gradually change, the rewind position of the transmission cord 15 at the transmission pulley 21 and the winding position of the transmission cord 15 at the drive pulley 22 move in the same direction at a constant speed.

As a result, the transmission cord 15 is
The winding operation and the rewinding operation are performed while being maintained in a direction substantially orthogonal to the axial direction between 1 and 22. The same applies when the transmission cord 15 is unwound from the drive pulley 22 and wound around the transmission pulley 21.

In the lifting assist device configured as described above, the following operation and effect can be obtained in addition to the operation and effect obtained in the first embodiment. (1) The helical grooves 23a and 23b of the transmission pulley 21 and the driving pulley 22 are formed at unequal pitch, so that the transmission pulley 21 is fitted to the transmission shaft 8 so as to be immovable in the axial direction. In this case, the winding position and the rewinding position of the transmission cord 15 can be moved at the same speed in the same direction.
A winding operation or a rewinding operation can be performed in a direction substantially orthogonal to the axial direction between the first and the second.

(2) Between the transmission pulley 21 and the transmission shaft 8, there is no need to provide a bearing device for supporting the transmission pulley 21 movably in the axial direction with respect to the transmission shaft 8. Therefore, the diameter of the transmission pulley 21 and the driving pulley 22 can be reduced, so that the size of the head box 1 can be reduced, and the cost can be reduced.

(3) Since it is not necessary to move the transmission pulley 21 in the axial direction, the sliding resistance generated when the transmission pulley 21 is moved in the axial direction can be eliminated. Therefore, the operation force required for the lifting and lowering operation of the slat 5 can be reduced.

The above-mentioned lifting assist device may be configured as follows. In the first embodiment, at least one of the transmission pulley 9 and the drive pulley 14 may be movable in the axial direction. A lifting device F2 acting on the lifting / lowering cord 7 is set to be always larger than a slat suspension weight by a certain value or more, and a clutch device for preventing the automatic lifting operation of the lifting / lowering cord by the lifting / lowering load F2 is provided. With this configuration, when the operation of the clutch device is released, the lifting load F2
Thereby, the slat 5 can be automatically pulled up. A lifting / lowering load F2 acting on the lifting / lowering cord 7 is set to be always larger than a slat suspension weight by a certain value or more, and a clutch device for preventing an automatic winding operation of the lifting / lowering cord by the lifting / lowering load F2 is provided. A damper device for controlling the automatic winding speed of the lifting cord by a constant speed or less. With such a configuration, when the operation of the clutch device is released, the slat 5 can be automatically pulled up by the lifting load F2, and the pulling speed of the slat 5 can be controlled to a certain speed or less.・ Three conical pulleys are used to balance the gradient between the slat suspension weight acting on the lifting cord and the lifting load. However, the two conical pulleys are used to balance the slat suspension weight acting on the lifting cord. The gradient with the lifting load may be approximated. A conical pulley whose winding diameter changes linearly is used for each of the pulleys, but a conical pulley whose winding diameter changes like a concave curve is used for the winding pulley 3 and transmission is performed. Pulleys 9, 21 and drive pulleys 14, 22
, A conical pulley whose winding diameter changes linearly may be used. With such a configuration, the lifting load F2 can be reduced more linearly with respect to the slat descent distance D. The lifting assist device can be used for a lift-up curtain, a pleated curtain, or a vertical folding type partition door. -Instead of the torsion coil spring 16, a torsion bar, rubber, a spring or the like may be used. -An initial torque adjusting device for adjusting the output torque of the torsion coil spring 16 with the slat 5 pulled up to the upper limit is provided. With the initial torque adjusting device, it is possible to set an initial torque according to the up-and-down stroke of the blind, and to cope with the secular change of the output torque of the torsion coil spring 16. A second lifting / lowering cord independent of the lifting / lowering cord 7 is suspended from the head box 1 and inserted into each slat and connected to the bottom rail, and the slat 5 is operated by operating the second lifting / lowering cord. A clutch that is capable of ascending and descending and is set so that the ascending and descending load F2 acting on the ascending and descending cord 7 is always larger than a slat suspension weight by a certain value or more. The apparatus includes a device and a device for preventing weight drop acting on the second lifting cord. With such a configuration, the slats 5 can be moved up and down by operating the second lifting cord, and the slats 5 can be prevented from descending by the dead weight prevention device acting on the second lifting cord.

[0050]

As described above in detail, the present invention provides a small-sized and low-cost shield lifting apparatus capable of reducing the lifting load applied to the lifting cord as the shielding member is lowered. be able to.

[Brief description of the drawings]

FIG. 1 is a front view showing a horizontal blind according to a first embodiment.

FIG. 2 is a sectional view of a transmission pulley.

FIG. 3 is an explanatory diagram showing output torque characteristics of a torsion coil spring.

FIG. 4 is an explanatory diagram showing characteristics of a load transmitted to a transmission pulley.

FIG. 5 is an explanatory diagram showing output torque characteristics of a transmission pulley.

FIG. 6 is an explanatory diagram showing a lifting load characteristic acting on a lifting cord from a winding pulley.

FIG. 7 is a front view showing a transmission pulley and a drive pulley according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head box 3 Winding pulley 5 Shielding material (slat) 7 Elevating cord 9,21 Load conversion device (Transmission pulley) 14,22 Load conversion device (Drive pulley) 15 Load conversion device (Transmission cord) 16 Energy storage spring (Torsion) (Coil spring)

Claims (6)

[Claims] 1. A shield member is suspended from a head box, and a lifting cord is suspended from a winding pulley rotatably supported in the head box. A lower end of the lifting cord is connected to a lower end of the shield member. Then, the hanging weight of the shielding material acting on the lifting cord is reduced with the lowering of the shielding material, and based on the lifting load acting on the lifting cord via the winding pulley by a spring, In a lifting and lowering device for a shielding material capable of winding the lifting cord up and down on a winding pulley against the hanging weight, the spring is configured by an energy storage spring that is charged with the lowering of the shielding material, A load conversion device that approximates the gradient of the change in the suspended weight and the gradient of the change in the lifting load due to the lowering of the shielding material is interposed between the energy storage spring and the lifting cord. Toss Lifting device of shielding material. 2. The load accumulating spring is constituted by a torsion coil spring, and the load conversion device is configured to convert an output torque of the torsion coil spring into a plurality of pulleys whose winding diameters are changed and between the pulleys. The lifting / lowering device for a shielding material according to claim 1, wherein the lifting / lowering load is transmitted to the take-up pulley via a transmission cord mounted on the winding pulley. 3. The load conversion device includes: a conical drive pulley on which the output torque of the torsion coil spring acts; a conical transmission pulley rotatably supported by the head box; and the drive pulley. And a transmission cord wound around the transmission pulley. The transmission cord is unwound from one of the driving pulley and the transmission pulley and wound around the other, and is wound from the smaller diameter side to the larger diameter side by one pulley. When being unwound or wound up, the other pulley is wound up or unwound from the large diameter side to the small diameter side, and a transmission device for transmitting the rotational torque of the transmission pulley to the winding pulley. The lifting / lowering device for a shielding material according to claim 2. 4. A winding pulley having a conical shape,
4. The shield lifting device according to claim 3, wherein when the lifting cord is wound, the winding pulley is wound from a large diameter side to a small diameter side. 5. The lifting and lowering of the shielding material according to claim 2, wherein at least one of the transmission pulley and the driving pulley is supported so as to be movable in a direction along a rotation axis of each pulley. apparatus. 6. A spiral groove around which the transmission cord is wound is formed on an outer peripheral surface of the transmission pulley and the driving pulley, and the spiral groove has a gradually increasing pitch from a small diameter side to a large diameter side of each of the pulleys. 4. The shield lifting and lowering device according to claim 3, wherein the winding position and the rewinding position of the transmission cord in each pulley are moved at the same speed in the same direction.