JP3571248B2 - blind - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blind having a brake for reducing a moving speed of an elevating cord when descending by its own weight of a slat and a bottom rail.
[0002]
[Prior art]
JP-A-8-112046 and JP-A-10-140950 disclose conventional blinds having a brake for reducing the moving speed of a lifting cord when descending by the weight of a slat and a bottom rail.
[0003]
That is, in the brake disclosed in Japanese Patent Application Laid-Open No. H08-112046, when the lifting / lowering cord is operated in the slat lifting direction, the movement of the lifting / lowering cord is guided in a straight line. A plurality of guide shafts for guiding the movement of the head box in a meandering manner are attached to the head box by support members.
[0004]
Further, a brake disclosed in Japanese Patent Application Laid-Open No. 10-140950 discloses a fixed pulley rotatably supported in a head box, a guide in a state where the lifting cord is bent in cooperation with the fixed pulley, and a moving direction of the lifting cord. And a movable pulley supported so as to be movable.
[0005]
[Problems to be solved by the invention]
However, the one disclosed in Japanese Patent Application Laid-Open No. 8-112046 is constituted by a plurality of guide shafts and a support member for attaching these guide shafts to a head box. Since it is composed of a fixed pulley and a movable pulley and a member for supporting these pulleys on the head box, there is a problem that the number of parts is large and the cost is increased. Further, in Japanese Unexamined Patent Application Publication No. 10-140950, since the stroke of the movable pulley is not large, the lifting cord is bent between the fixed pulley and the movable pulley even when the slat is raised, so that the resistance increases. In addition, there is a problem that a plurality of lifting codes may be entangled.
[0006]
The present invention has been made in view of such problems, and the inventions according to claims 1 and 2 can be realized with a small number of parts, have low resistance when pulling up a slat, and have a plurality of lifting / lowering cords. It is an object of the present invention to provide a blind having a brake that does not involve the lifting cord of the vehicle.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a rotating shaft is rotatably supported in a head box, and a large number of slats are aligned on the rotating shaft. The upper end of the supporting ladder tape is connected, a bottom rail is arranged at the lower end of the slat row, one end of a lifting cord is connected to the bottom rail, and the other end of the lifting cord is connected to the slat row. After being inserted into the head box and introduced into the head box, the blinds are routed in the head box, and are further led out of the head box through a stopper device provided in the head box and capable of restraining the movement of the elevating cord. ,
The other end of the lifting / lowering cord introduced into the head box is wired non-parallel to the rotation axis from a first position to a second position in the head box. A brake is supported slidably along the axial direction of the rotating shaft, and the brake has an insertion hole through which the non-parallel portion of the elevating cord is inserted while being in contact with the brake. It is characterized by being located at a position substantially opposite to the second position, but at a position not opposed to the first position.
[0008]
When the slat and the bottom rail are lowered, the brake moves together with the lifting cord to the vicinity of the first position due to frictional resistance with the lifting cord. Since the insertion hole and the first position are at positions not opposed to each other, the lifting cord is bent between them, resistance is applied to the lifting cord, and the moving speed of the lifting cord is reduced.
[0009]
When the slat is raised, the brake moves to the vicinity of the second position together with the lifting cord due to frictional resistance with the lifting cord. Since the insertion hole and the second position are substantially opposed to each other, the lifting cord does not bend between them, no resistance is applied to the lifting cord, and the lifting cord can move smoothly.
[0010]
The brake in which the insertion hole for the lifting cord is formed is directly supported on the rotating shaft, so that the number of parts is small and the cost is low.
[0011]
According to a second aspect of the present invention, in the first aspect, the brake is provided between a stopper device leading-out position of the lifting / lowering cord and a head box leading-out position of the lifting / lowering cord. The position 1 is a position where the lifting device is brought out of the lifting device.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 shows a front view of a blind 10 embodying the present invention, and FIG. 2 shows a main front view of the inside of a head box.
[0014]
A rotating shaft 16 is rotatably supported in the head box 14, and the upper end of a ladder tape 15 that supports the plurality of slats 12 in an aligned state can be tilted on the rotating shaft 16. It is connected to. A bottom rail 17 is disposed at the lower end of the 12 rows of slats, and one end of a lifting cord 18 is connected to the bottom rail 17. A plurality of lifting / lowering cords 18 are provided at predetermined intervals in the width direction of the blind 10 (one is omitted in FIG. 1, but three in this example), and the other end of each lifting / lowering cord 18 is 12 rows of slats. Is inserted into the head box 14, and is routed inside the head box 14, passes through a stopper device 28, which will be described later, and is provided at one end of the head box 14 and capable of driving the rotation shaft 16 to rotate. Through the head box 14. After being drawn out of the head box 14, a hollow grip provided inside the hollow tilter input shaft 21 and the rotary operation rod 22 hanging from the head box 14 and at the lower end of the rotary operation rod 22 so as to be vertically movable. 24, each of which is connected to a knob 25 disposed below the grip 24. The tilter input shaft 21 and the rotary operation rod 22 are connected by a universal joint 23, and rotation from the grip 24 is transmitted to the tilter 20 via the rotary operation rod 22 and the tilter input shaft 21 and included in the tilter 20. The rotation of the rotating shaft 16 is converted by a plurality of gears. The tilter input shaft 21 is normally urged upward by the coil spring 26 toward the inside of the head box 14.
[0015]
In the head box 14, a stopper device 28 capable of restraining the movement of the elevating cord 18 is disposed. The stopper device 28 has one end of a stopper releasing cord 30 capable of releasing the restraint of the elevating cord 18. Are linked. The other end of the stopper release cord 30 is connected to the tilter input shaft 21. By pulling the grip 24 downward, the tilter input shaft 21 pulls the stopper release cord 30 against the urging force of the coil spring 26, and the stopper device 28 is released.
[0016]
The lifting / lowering cord 18 is moved from a stopper device leading position 36 (first position), which is a leading position from the stopper device 28, to a head box leading position 38 (from the head box 14 at the tilter 20) in the head box 14. (A second position) with respect to the rotation axis 16. The rotary shaft 16 between the stopper device 28 and the tilter 20 is provided with a brake 32 for reducing the moving speed of the lifting cord 18 when the slats 12 and the bottom rail 17 are lowered.
[0017]
As shown in FIGS. 3 and 4, the brake 32 has a rotary shaft insertion hole 32a through which the rotary shaft 16 can be inserted. The brake 32 is inserted by inserting the rotary shaft 16 into the rotary shaft insertion hole 32a. Are supported by the rotating shaft 16 so as to be slidable along the axial direction of the rotating shaft 16. The brake 32 has three insertion holes 32b. The insertion hole 32b of the brake 32 is located at a position substantially opposite to the head box lead-out position 38, but at a position not facing the stopper device lead-out position 36. Preferably, a brake guide 34 fixed to the head box 14 along the rotation shaft 16 is provided as shown in FIG. The brake guide 34 (FIG. 5) has a concave surface 34a on which the brake 32 slides. Preferably, the code guide 35 (FIG. 6) is fixed to the stopper device lead-out position 36 of the stopper device 28, and the stopper device 28 is led out into a plurality of insertion holes 35 a and 35 b formed in the code guide 35. The lifting cord 18 and the stopper release cord 30 are inserted respectively. Then, the three lifting / lowering cords 18 are inserted through the through holes 32 b of the brake 32 while being in contact therewith, and the stopper release cord 30 passes below the brake 32.
[0018]
Next, the operation of the present embodiment will be described.
[0019]
First, as shown in FIG. 7, when lowering the slat 12, the grip 24 is pulled downward and the stopper release cord 30 is operated to release the stopper device 28. As a result, one end of the lifting cord 18 is pulled downward by the weight of the slats 12 and the bottom rail 17, and the lifting cord 18 moves leftward. At this time, the brake 32 moves to the left along with the lift cord 18 due to frictional resistance between the lift cord 18 and stops when it comes closest to the stopper device lead-out position 36, and moves up and down while the slat 12 is lowered. Since a leftward force is applied from the cord 18, the position closest to the stopper device leading-out position 36 is maintained. Since the position of the insertion hole 32b of the brake 32 and the stopper device lead-out position 36 are displaced, the lifting cord 18 is bent between the brake 32 and the stopper device 28, and resistance is applied to the lifting cord 18, so that the lifting cord 18 Is reduced, and the slats 12 and the bottom rail 17 slowly descend.
[0020]
Next, as shown in FIG. 8, when raising the slat 12, the knob 25 is pulled down, the lifting cord 18 is moved rightward, and one end of the lifting cord 18 is raised, so that the bottom rail 17 and the bottom rail 17 are lifted. Raise the slats 12. At this time, the brake 32 moves rightward due to frictional resistance with the lifting cord 18 with the movement of the lifting cord 18, stops when it comes closest to the head box lead-out position 38, and continues to pull down the knob 25. Since the rightward force is continuously applied from the lifting cord 18 during the interval, the position closest to the head box lead-out position 38 is maintained. The position of the insertion hole 32b of the brake 32 and the head box lead-out position 38 are substantially opposed to each other, and the brake 32 and the stopper device lead-out position 36 are separated from each other. Since it is guided in a straight line, no resistance is applied to the lifting cord 18, and the lifting cord 18 can move smoothly. Since the movement stroke of the brake 32 is large between the stopper device 28 and the tilter 20, when the brake 32 is approaching the head box lead-out position 38, the lifting / lowering cord 18 is pulled out in a substantially linear shape. It is possible to guide between the position 36 and the head box lead-out position 38, and the resistance acting on the lifting / lowering cord 18 can be reduced.
[0021]
As described above, when the slat is lowered, the impact of the brake 32 is reduced by the action of the brake 32, and when the slat is raised, the brake 32 does not act and the lifting cord 18 moves smoothly, thereby improving the operational feeling and increasing the commercial value.
[0022]
Since the plurality of lifting / lowering cords 18 are respectively inserted into the insertion holes 32b of the brake 32, they are not entangled with each other.
[0023]
【The invention's effect】
As described above, according to the present invention, the brake provided with the insertion hole for the lifting cord is only supported directly on the rotating shaft, and the number of parts is small and the cost is low. Further, since the sliding stroke of the brake can be increased, when the slat is raised, the brake can be moved so that resistance is not applied to the lifting cord. Furthermore, since the lifting cord is inserted through the insertion hole of the brake, even if there are a plurality of lifting cords, it is possible to prevent entanglement with each other.
[Brief description of the drawings]
FIG. 1 is a front view of a blind embodying the present invention.
FIG. 2 is a main front view of the inside of the head box.
FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;
FIG. 4 is a perspective view of a brake.
FIG. 5 is a perspective view of a brake guide.
FIG. 6 is a perspective view of a cord guide.
FIG. 7 is an explanatory diagram showing a state inside the head box when the slat is lowered.
FIG. 8 is an explanatory diagram showing a state in the head box when the slat is raised.
[Explanation of symbols]
12 Slat 14 Head box 15 Ladder tape 16 Rotating shaft 17 Bottom rail 18 Elevating cord 28 Stopper device 32 Brake 36 Stopper device lead-out position (first position)
38 Headbox lead-out position (second position)

Claims (2)

A rotary shaft (16) is rotatably supported in the head box (14), and the rotary shaft (16) has an upper end of a ladder tape (15) for supporting a large number of slats (12) in an aligned state. A bottom rail (17) is disposed at the lower end of the row of slats (12), and one end of a lifting cord (18) is connected to the bottom rail (17). ) Is inserted into the head box (14) through the row of slats (12), and then routed inside the head box (14). (18) In a blind led out of the head box (14) through a stopper device (28) capable of restricting the movement of (18),
The other end of the lifting cord (18) introduced into the head box (14) is connected to the rotation shaft (16) from a first position (36) to a second position (38) in the head box (14). And a brake (32) is supported on the rotating shaft (16) so as to be slidable along the axial direction of the rotating shaft (16). Is formed with an insertion hole (32b) through which the non-parallel portion of the lifting / lowering cord (18) comes in contact, and the insertion hole (32b) is substantially opposed to the second position (38). A blind, characterized in that it is positioned in a position, but not in a position facing said first position (36). The brake (32) is provided between a stopper device leading-out position (36) of the lifting / lowering cord (18) and a head box leading-out position (38) of the lifting / lowering cord (18), and the first position is a position of the lifting / lowering cord. The blind according to claim 1, characterized in that the stop is at a stop position (36).

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