JPH0422712Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a lifting device for raising and lowering slats of blinds, pulled-up curtains, etc.

(Prior art) Conventionally, as a type of blind lifting device, the winding shaft inside the head box is rotated by operating an endless operation cord hanging from one side of the head box to raise and lower the slats and adjust the angle. There is something like this.

(Problem to be solved by the invention) In the conventional lifting device as described above, when operating the operating cord to pull up the slat, the lifting cord is wound up with the take-up shaft and the bottom rail is pulled up. The slats supported by cords are pushed up from the bottom rail using the same bottom rail. Therefore, as the slats are pulled up, the number of slats stacked on the bottom rail increases, and the weight on the lifting cord increases.
It was also necessary to gradually increase the operating force required to rotate the take-up shaft using the operating cord.

Structure of the invention (means for solving the problems) In order to solve the above problems, this invention rotates a winding shaft by operating an operating cord, and the winding shaft drives the lifting cord to wind it. In a blind that raises and lowers a slat, a flexible belt-shaped weight member 14 that can be wound around a winding shaft 4 and whose lower end is suspended from the winding shaft 6 is unwound as the slat 6 is pulled up. The lifting cord 8 is wound and supported on the winding shaft 4 in a direction opposite to the winding direction.

(Function) With the above means, as the operating cord is operated to pull up the slat 6, the weight member 14 is sequentially unwound from the winding shaft 4, and the length of the weight member 14 hanging from the winding shaft 4 becomes gradually longer.

(Embodiment) An embodiment embodying this invention will be described below with reference to the drawings.As shown in Fig. 4, a rectangular frame 1
The frame blind 2 suspended between the two has a winding shaft 4 rotatably supported within the upper frame 3 of the rectangular frame 1.
A plurality of slats 6 are suspended and supported as objects to be raised and lowered via two ladder cords 5, and a bottom rail 7 is suspended and supported at the lowest stage. Also,
An elevating cord 8 passes through each slat 6 near the support portion of the ladder cord 5, the upper end of the elevating cord 8 is wound around the winding shaft 4, and the lower end is connected to the bottom rail 7.

A gearbox 10 is provided at the upper end of one vertical frame 9 of the square frame 1, and a pulley 11 is rotatably supported on the front surface of the gearbox 10.
An endless operation cord 12 is suspended from the cord 1 . When the operation code 12 is operated, the winding shaft 4 is moved through the pulley 11 and gear box 10.
is rotated, and the slat 6 is raised and lowered or its angle is adjusted.

Next, the winding mechanism of the lifting cord 8 will be explained. As shown in FIG. The upper end of the lifting cord 8 is wrapped. A band-shaped weight 14 as a weight member made of a flexible material that can be wound around the winding shaft 4 is wound around both ends of the winding shaft 4, and the lower end of the weight 14 is attached to the winding shaft. 4 is suspended on the opposite side of the lifting cord 8. When the blind 2 is lowered to the lowest limit as shown in FIG. 2, the weight 14 is wound up leaving its lowermost end on the winding shaft 4, and the blind 2 is pulled up as shown in FIG. According to this, the weight 14 is sequentially rewound. In addition,
The weight 14 is suspended within the vertical frame of the square frame 1 so that it cannot be seen from the front of the framed blind 2.

Next, the operation of the blind lifting device configured as described above will be explained.

Now, as shown in FIG. 2, when the blind 2 is lowered to the lowest limit, the weight of each slat 6 is supported by the ladder cord 5, so that the winding shaft 4 is almost at the arrow mark due to the weight of the bottom rail 7. A
A rotational force in the direction of arrow B acts on the winding shaft 4 through the lifting cord 8, and at the same time, a rotational force in the direction of arrow B acts on the winding shaft 4 due to the weight 14 slightly hanging from the winding shaft 4, which increases the magnitude of the rotational force in both directions. The size is almost the same.

From this state, when the operation cord 12 is operated to rotate the take-up shaft 4 and the bottom rail 7 is pulled up via the lift cord 8, the slats 6 are sequentially placed on the bottom rail 7, starting from the lower slat 6, as shown in FIG. Because they are stacked, the winding shaft 4 has an arrow C due to the weight of the bottom rail 7 and the slats 6 on the bottom rail 7.
A rotational force in the direction acts through the lifting cord 8.
On the other hand, as the bottom rail 7 is pulled up, the weight 1
4 is sequentially rewound, and due to the weight of the weight 14, the rotational force acting on the winding shaft 4 in the direction of arrow D gradually increases, and the rotational forces in the directions of arrows C and D are always approximately equal.

Therefore, when pulling up the slats 6 of the blind 1, the rotational force acting on the winding shaft 4 due to the weight of the slats 6 stacked on the bottom rail 7 is canceled by the rotational force acting in the opposite direction due to the weight 14. The slat 6 can be pulled up with a slight operating force equivalent to lifting only the bottom rail 7. Furthermore, the configuration for this purpose is simple, there is little risk of failure, and manufacturing costs can be reduced.

In addition to the above-mentioned embodiments, this invention can also be applied to a lifting device such as a pull-up curtain.

Effects of the invention As detailed above, this invention
It is possible to apply a rotational force to the winding shaft 4 using the weight member 14 in a direction that offsets the rotational force acting on the winding shaft 4 through the weight member 14, thereby reducing the operating force when lifting the object 6. The structure is simple, there are few failures, and the manufacturing cost is low.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of a lifting device embodying this invention, FIGS. 2 and 3 are schematic side views showing the operation of a blind equipped with the lifting device,
FIG. 4 is a front view of a framed blind embodying the lifting device of this invention. Winding shaft...4, Slut...6, Lifting cord...
...8, Operation code...12, Weight...14.

Claims (1)

[Scope of utility model registration request] In a blind or the like in which an object to be lifted or lowered is raised or lowered by rotating a winding shaft by a drive means and driving a lifting cord to be wound up and lowered by the winding shaft, winding can be carried out on a winding shaft 4, and the lower end thereof is connected to the winding shaft. A flexible belt-shaped weight member 14 hanging from the lifting cord 8 is wound and supported on the winding shaft 4 in a direction opposite to the winding direction of the lifting cord 8 so that it is wound back as the object 6 is lifted up. A lifting device for blinds, etc., characterized by: