JPH0516396Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a slat drive device for raising and lowering the slats of a blind and adjusting the angle thereof.

(Prior Art) Conventionally, as a type of blind, multiple stages of slats are suspended and supported from a headbox via ladder cords and lifting cords, and the ladder cords and lifting cords are rotatably supported within the headbox. Some slats are suspended and supported from a shaft, and the slats can be raised and lowered and the angle can be adjusted by rotationally driving the drive shaft using an operating means such as an operating cord.

In such blinds, the slats are raised and lowered based on the operation of the operating cord, and the angle is adjusted at the same time, and after each slat is tilted vertically, the drive shaft idles relative to the slat angle adjustment device.
Each slat is vertically raised and lowered.

(Problem that the invention seeks to solve) However, since the slats are raised and lowered at the same time as the angle is adjusted, for example, if the slats are lowered to the lowest position and then adjusted in the horizontal direction, the bottom rail at the lowest level of the slats As the window rose slightly, there was a problem that a gap was created between the window and the bottom frame, allowing sunlight to leak through.

In order to solve this problem, for example,
As described in Japanese Patent No. 81583, a slat drive device has been proposed that is provided with an idle device that connects the tilter drum and the lifting drum after the tilter drum for adjusting the angle of the slat rotates a certain amount.

However, the device described in the above publication has the problem that the structure becomes complicated because it is necessary to incorporate each of the first to third idling drums each having a locking protrusion as an idling device into the drive shaft. It was hot.

Structure of the invention (Means for solving the problem) In order to solve the above problem, this invention uses a drive shaft that is rotatably supported within the head box by operating an operating cord hanging from one side of the head box. In this blind, the slats can be raised and lowered and their angles can be adjusted by rotationally driving the slats.A tilter drum is fitted onto the drive shaft, and the ladder cord is suspended and supported by the tilter drum, so that the angle of each slat can be adjusted as the drive shaft rotates. In addition, when the slat is rotated in the vertical direction, an idling means is provided to cause the drive shaft to idly rotate against the ladder cord, and the slat is attached in a direction in which the support member is pressed against the support member fixed to the head box. A torsion coil spring with force is fitted, and both ends of the torsion coil spring are bent in the radial direction, and the lifting cord of the slat is suspended and supported so that it can be wound from an lifting drum rotatably supported by a support member. , a first engaging protrusion is provided at one end of the elevating drum to engage with the end of the torsion coil spring and bias the torsion coil spring in the same direction as its biasing force, A second engaging protrusion is provided that engages with either end of the torsion coil spring and biases the torsion coil spring in a direction opposite to its biasing force.

(Function) The drop of the slat due to its own weight is prevented by the engagement between the first engaging protrusion of the elevating drum and the end of the torsion coil spring. When the drive shaft is rotated by operating the operating cord, the tilter drum is rotated and the slat is rotated in the vertical direction. When the second engagement protrusion and the end of the torsion coil spring are engaged, the tilter drum is rotated. The slats are raised and lowered by rotating together with the lifting drum.

(Embodiment) Hereinafter, an embodiment embodying this invention will be described with reference to the drawings. As shown in FIG. is supported,
A bottom rail 5 is suspended from the lowest part of the ladder cord 3. An elevating cord 6 hanging from the head box 2 passes through the vicinity of the support portion of the ladder cord 3 of each slat 4, and the lower end of the elevating cord 6 is connected to the bottom rail 5.
Each slat 4 can be moved up and down and the angle can be adjusted by operating an operating cord 7 hanging from one side of the head box 2 to operate a slat drive device, which will be described later, built into the head box 2.

Next, the slat drive device built into the head box 2 will be explained in detail.
A box-shaped support member 8 with an open top is fitted and fixed on both left and right sides of the support member 8, and first and second side pieces 9a and 9b are provided on both sides of the support member 8, and a center portion is provided in the center. A partition 10 is formed. The inner partition 10 is formed with a cylindrical portion 11 that protrudes toward the first side piece 9a, and a torsion coil spring 12 is fitted onto the inner peripheral surface of the cylindrical portion 11 with a biasing force to increase the diameter. , the ends 13a, 13b of the torsion coil spring 12 as shown in FIG.
are bent inward to face each other at close positions.

A lifting drum 14 is rotatably supported between the partition 10 and the second side piece 9b, and a spiral winding groove 15 is formed on the outer peripheral surface of the lifting drum 14. Further, a cord guide 16 is screwed onto the elevating drum 14 through its winding groove 15, and the cord guide 16 abuts against the inner surface of the support member 8 and cannot rotate. Therefore, the cord guide 16 is adapted to be moved in the left-right direction in FIG. 1 when the elevating drum 14 is rotated. The upper end of the lifting cord 6 is hooked to the lifting drum 14, and the lifting cord 6 is rotatably supported by a guide roller 17 rotatably supported by the cord guide 16 and by a support member 8 below the cylindrical portion 11. Guide roller 1
8 and is led to the bottom of head box 2.
When the lifting drum 14 is rotated in the lifting cord winding direction, the cord guide 16 is moved to the right in FIG.
When the lifting drum 14 is rotated in the opposite direction, the lifting cord 6 is unwound and the cord guide 16 is moved to the left. Therefore, since the lifting cords 6 are always wound around the lifting drum 14 at equal intervals, the wound lifting cords 6 do not become entangled with each other.

As shown in FIG. 3, a first engagement projection 19 is formed at one end of the lifting drum 14, that is, on the partition 10 side, and projects between the ends 13a and 13b of the torsion coil spring 12. Then, even if the first engagement protrusion 19 comes into contact with either end 13a or 13b, the torsion coil spring 12 is about to expand in diameter and comes into even stronger pressure contact with the inner circumferential surface of the cylindrical part 11, so that the elevating drum 14 is designed not to rotate due to the rotational force based on the weight of the slats 4 and bottom rail 5 acting on the lifting drum 6.

One side of a tilter drum 20 is rotatably supported on the first side piece 9a of the support member 8, and a friction tape 21 as an idle means is hung on the tilter drum 20, and the ladder cord is attached to both ends of the friction tape 21. 3 is suspended and supported. At the center of the tilter drum 20 is a square rod-shaped drive shaft 22.
The drive shaft 22 passes through the lifting drum 14 and extends to the other slat drive device of the head box 2. When the drive shaft 22 is rotated by operating the operation cord 7, and the tilter drum 20 is rotated based on the rotation, the ladder cord 3 is driven via the friction tape 21, and the angle of each slat 4 is adjusted. When the slats 4 are rotated vertically, the tilter drum 20 idles against the friction tape 21, so that each slat 4 is prevented from rotating any further.

The other side of the tilter drum 20, that is, the partition 1
On the 0 side, a second engagement protrusion 23 protrudes to a position where it can engage with the ends 13a, 13b of the torsion coil spring 12 based on the rotation. Then, even if the tilter drum 20 is rotated and the second engagement protrusion 23 comes into contact with either end 13a or 13b, the torsion coil spring 12 tends to contract in diameter. As the torsion coil spring 12 rotates, the lifting drum 14 is rotated via the first engagement protrusion 19. Therefore, after the second engagement protrusion 23 contacts the ends 13a and 13b, the tilter drum 2
0, the lifting drum 14 is rotated and each slat 4 is raised and lowered.

Next, the operation of the slat drive device constructed as described above will be explained.

Now, in this blind 1, when the operating cord 7 is operated to pull up the slat 4, for example, the second engaging protrusion 23 is attached to one end 13a of the torsion coil spring 12, as shown in FIG. The torsion coil spring 12 and the elevating drum 14 are rotated in the direction of the arrow A as they come into contact with the tilter drum 20, and the elevating cord 6 is wound up on the elevating drum 14 and successively pulled up from the lower slat. At this time, the tilter drum 20 is attached to the friction tape 21.
The slats 4 are rotated idly relative to each other, and each slat 4 is pulled up while being rotated in a substantially vertical direction.

When adjusting the angle of the slat 4 after pulling it up to a desired position, operating the operation cord 7 in the opposite direction rotates the tilter drum 20 in the opposite direction, and the second engagement protrusion 23 moves as shown in FIG. Move in the direction of arrow B. In this state, the tilter drum 20
The rotation of the tilter drum 20 is not transmitted to the lifting drum 14, but the friction tape 21 is driven based on the rotation of the tilter drum 20, and the angle of the slat 4 is adjusted. and,
While the second engagement protrusion 23 is moved to the position indicated by the chain line in the figure, each slat 4 is rotated 180 degrees and then vertically again, and in this state, the operating cord 6 is further moved in the same direction. When operated, tilter drum 2
0 rotates idly against the friction tape 21, and the second engaging protrusion 23 twists and engages the end 13 of the coil spring 12.
b, the torsion coil spring 12 and the elevating drum 14 are rotated, the elevating cord 6 is rewound, and each slat 4 is sequentially lowered.

As described above, this blind 1 has 4 slats.
When the angle of the slats 4 is adjusted after they have been raised and lowered to a desired position, the angle of the slats 4 can be adjusted by driving the ladder cords 3 without driving the lifting and lowering cords 6. Therefore, since the angle of each slat 4 can be adjusted while it is held at a desired position, for example, even if the angle of the slats is adjusted horizontally after they have been lowered to the lowest position, the bottom rail of the lowest slat will rise slightly, and a gap will not be created between the bottom rail and the window frame, allowing sunlight to leak in. In addition, such a slat drive device can be realized with an extremely simple configuration.

Effects of the invention As detailed above, this invention is a blind that uses a common operation code to raise and lower the slats and adjust their angle. A slat drive device that can adjust the angle of the slat while holding the slat at a desired height only needs to be provided with a torsion coil spring and locking protrusions that are engaged with both ends of the torsion coil spring. Since the protrusions are formed on the elevating drum and tilter drum for elevating and adjusting the angle of the blind, excellent effects can be achieved with a simple configuration.

[Brief explanation of the drawing]

Fig. 1 is a front view of a slat drive device embodying this invention, Fig. 2 is a cross-sectional view thereof, Fig. 3 is a side sectional view showing the torsion coil spring portion, and Fig. 4 is a view of a blind related to this invention. It is a front view. Headbox...2, Ladder code...3,
Slut...4, Lifting cord...6, Operation cord7, Support member...8, Torsion coil spring...
12, End portion...13a, 13b, Lifting drum...
14. First engaging protrusion...19. Tilter drum...20. Friction tape as idling means...2
1. Drive shaft... 22. Second engagement protrusion.

Claims (1)

[Claims for Utility Model Registration] A blind in which the slats can be raised and lowered and the angle can be adjusted by rotating a drive shaft rotatably supported within the headbox by operating an operating cord hanging from one side of the headbox, A tilter drum 20 is fitted onto the drive shaft 22,
The tilter drum suspends and supports the ladder cord 3 so that the angle of each slat 4 can be adjusted as the drive shaft rotates, and when the slat 4 is rotated vertically, it is driven against the ladder cord 3. An idling means 21 for idling the shaft 22 is provided, and a torsion coil spring 12 having a biasing force in the direction of pressing the support member 8 fixed to the head box 2 is fitted therein. Both ends 13 of
a, 13b are bent in the radial direction, and the lifting cord 6 of the slat is suspended and supported so as to be windable from the lifting drum 14 which is rotatably supported by the support member 8, and the torsion coil spring end is attached to one end of the lifting drum. A first engaging protrusion 19 that engages with the torsion coil spring 12 in the same direction as the biasing force is provided on the tilter drum 20 after a predetermined rotation.
A slat drive device for a blind, characterized in that a second engaging protrusion 23 is provided which engages with either one of the torsion coil springs 13a and 13b to bias the torsion coil spring in a direction opposite to its biasing force.