JPH0431999Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a dead weight drop prevention device for suspending and supporting the slats of a blind at a desired position.

(Prior art) Conventionally, as a type of blind slat lifting device, a lifting cord hanging down from the head box side is pulled down to pull up the bottom rail and the slats, and the lifting cord is used to lift the weight of the bottom rail and slats. There is one that lowers the bottom rail and lowers the slat by pulling it into the head box using the bottom rail. Such a lifting device is provided with a dead weight drop prevention device as shown in FIG. 4 at the lifting cord outlet. That is, the device includes a fixed roller 2 that guides the lifting cord 1 downward, and a guide slope that is positioned on the cord separating pin 3 when the lifting cord 1 is moved when the lifting cord 1 is released. A movable roller 5 is provided which moves upward along the vertical axis 4 and clamps the lifting cord 1 between it and the fixed roller 2, as shown by the chain line in the figure.

(Problem to be solved by the invention) However, in the dead weight drop prevention device as described above, the movable roller 5 is supported on the downwardly curved string dividing pin 3, and there is a slight distance between the movable roller 5 and the fixed roller 2. Therefore, after releasing the lifting cord 1, it takes some time for the movable roller 5 to move upward along the guide slope 4 and sandwich the lifting cord 1 between it and the fixed roller 2. Therefore, since the lifting cord 1 moves during this time, there is a problem in that the slat is suspended and supported at a position slightly lower than the position at which the lifting cord is released. Additionally, as the slat descends during this short period of time, it falls rapidly due to the weight of the bottom rail and the slat, which places a large load on the device that prevents the slat from falling, making it more likely to break down. Ta.

Structure of the invention (means for solving the problems) In order to solve the above problems, this invention rotatably supports a fixed roller in the main body, and a string separating pin is attached to the main body below the fixed roller. A movable roller attached to the main body and normally supported on the string separating pin is movable along a guide slope provided on the main body toward a fixed roller, and an elevating cord is provided between the fixed roller and the movable roller. In the dead weight drop prevention device for blinds, which moves the movable roller toward the fixed roller along the guide slope by inserting the lifting cord and moving the lifting cord upward, so that the lifting cord is sandwiched between the rollers. , a support portion 25 is provided by bending the center portion of the string separating pin 23 upward in a chevron shape, and the movable roller 22 is attached to the oblique side 25a of the support portion 25 on the guide slope 24 side.
is supported at a position close to the fixed roller 20.

(Function) By the above means, the movable roller 22 is supported at a position close to the fixed roller 20 by the string separating pin 23.

(Embodiment) An embodiment embodying this invention will be described below with reference to FIGS. 1 to 3. In FIG. 14 is supported. By operating the angle adjustment rod 15 hanging down from one side of the head box 12, each slat 1 is connected via an angle adjustment shaft (not shown) in the head box 12 and the ladder cord 13.
4 can be adjusted in angle.

The bottom rail 16 suspended from the lower end of the ladder cord 13 is connected to the lower end of a lifting cord 17 that passes through the vicinity of the ladder cord support portion of each slat 14, and the other end of the lifting cord 17 passes through the inside of the head box 12. It is suspended from near the angle adjustment string 15 on one side of the head box 12 via a dead weight drop prevention device described later. The bottom rail 16 and each slat 14 can be raised and lowered by operating the lifting cord 17, and each slat 14 is suspended and supported at the position where the lifting cord 17 is released by the action of the dead weight drop prevention device. .

Next, the detailed structure of the self-weight drop prevention device will be explained with reference to FIGS. A fixed roller 20 is rotatably supported on the upper part of the roller, and a non-slip member 21 is provided on the outer peripheral surface of the fixed roller 20.

A movable roller 22 is diagonally below the fixed roller 20.
is supported on the string dividing pin 23. The guide slope 24 with which the movable roller 22 comes into contact is formed as a slope that approaches the fixed roller 20 in an upward direction, and has a sawtooth cross section so that the gear-shaped movable roller 22 meshes therewith. The center part of the string separating pin 23 is bent slightly upward into a chevron shape to form a support part 25 of the movable roller 22, and the guide slope 2 of the support part 25 is bent slightly upwardly into a chevron shape.
The movable roller 22 is supported between the oblique side 25a on the fourth side and the guide slope 24. The movable roller 2 supported on the string dividing pin 23
2 and the fixed roller 20 is the lifting cord 1.
A distance slightly larger than the diameter of roller 7 is ensured, and the lifting cord 17 is suspended downward after passing between both rollers 20 and 22.

Now, to explain the case of raising and lowering the slats 4 of the blind 11 configured as described above, first, when raising the slats 14, the movable rollers 22 is lowered to above the cord dividing pin 23, and in this state, if the lifting cord 17 is pulled downward, the bottom rail 16 is pulled up and successively pulled up from the lower slat 14.

When the lifting cord 17 is released after lifting the slat 14 to the desired position, the lifting cord 17 tries to be pulled into the head box 12 due to the weight of the bottom rail 16 and the slat 14, but at this time it is in a downward hanging state. Since the lifting cord 17 and the movable roller 22 are engaged and the movable roller 22 is moved upward along the guide slope 24, the lifting cord 17 is moved between the fixed roller 20 and the movable roller 22 as shown in FIG. sandwiched between. Therefore, the movement of the lifting cord 17 is prevented and the slat 14 is suspended and supported at a desired position, and when the lifting cord 17 is released, the distance between the movable roller 22 on the cord separating pin 23 and the fixed roller 20 is small. Therefore, the lifting cord 17 is clamped instantly after being released.

On the other hand, when lowering the slat 14, the first
As shown in the figure, when the lifting cord 17 is pulled diagonally downward, the sandwiched state between the rollers 20 and 22 is released, and the movable roller 22 falls onto the cord separating pin 23. In this state, the slat 14 and the bottom rail 1
If the lifting cord 17 is pulled into the head box using the weight of the slat 14, the slat 14 can be lowered.If the lifting cord 17 is released after being lowered to the desired position, the lifting cord 1
7 is sandwiched between both rollers 20 and 22, and the slat 14 is suspended and supported at a desired position.

As described above, in this self-weight drop prevention device, when moving the lifting cord 17, the movable roller 22 is positioned on the string separating pin 23 and close to the fixed roller 20, so the lifting cord 17 can be released after the operation is completed. If so, it is instantly sandwiched between both rollers 20 and 22. Therefore, the sudden fall of the slats 14 and bottom rail 16 due to their own weight, which occurs in conventional dead weight drop prevention devices, does not occur, and damage to the dead weight drop prevention device due to excessive load can be prevented. Such a structure can be constructed extremely easily by simply replacing the cord separating pin 23 in the conventional self-weight drop prevention device.

Effects of the invention As detailed above, this invention can instantly prevent the dead weight of the blind from falling when the operation cord is released, and provide a device for preventing the blind from falling due to its own weight, which has excellent safety and durability, with a simple configuration. Demonstrate the best possible effects.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of a self-weight drop prevention device that embodies this invention, Fig. 2 is a longitudinal cross-sectional view showing its operation, Fig. 3 is a front view of a blind related to this invention, and Fig. 4 The figure is a longitudinal sectional view showing a conventional self-weight drop prevention device. Fixed roller...20, Movable roller...22, Separating pin...23, Guide slope...24, Support part...
...25, hypotenuse...25a.

Claims (1)

[Claims for Utility Model Registration] A fixed roller is rotatably supported within the main body, and a string separating pin is attached to the main body below the fixed roller, and a movable roller is always supported on the string separating pin. is movable toward a fixed roller along a guide slope provided on the main body, a lifting cord is inserted between the fixed roller and the movable roller, and the movable roller is guided by the upward movement of the lifting cord. In the dead weight drop prevention device for a blind, in which the lifting cord is moved toward a fixed roller along a slope and sandwiched between the two rollers, the central part of the cord separating pin 23 is bent upward in a chevron shape. A blind dead weight drop prevention device characterized in that a support part 25 is provided, and a movable roller 22 is supported at a position close to the fixed roller 20 by an oblique side 25a of the support part 25 on the guide slope 24 side.