JPH05231079A - Blind shutter - Google Patents

Abstract

PURPOSE:To reduce cost by suspending weights provided with heavy chains on sprockets provided on a hoisting shaft, and thereby balancing the weights against the weight of a shutter when the heavy outside fitted blind shutter is hoisted up. CONSTITUTION:The front and rear edges of plural blades 1 arranged in a frame 7 at equal intervals and in parallel are respectively connected by cords 2, and both ends of each cord are mounted on frictional wheels 9 provided on a shaft 8 to open and close the blades freely. Cords 3 are passed through both end of each blade 1, and one end of each of the cord is fixed to the lowermost blade 1 and the other end is mounted on a hoisting wheel 10 provided on the shaft 8. Then, a bevel gear 11 intersecting the shaft 8 is provided to be turned by a cord 12 for the blades 1 to be freely lifted and lowered through the winding wheels 10. Further, sprockets 6 are provided on both ends of the shaft 8, and heavy chains 4, on one end of each of which a weight 5 is mounted, are suspended on the sprockets. When the blades 1 are lifted and lowered, the weights of the blades 1 and the chains 4 are balanced in response to the amount of hoisting. Thus, the blades can be lightly operated to be lifted and lowered manually, and the shutter can be manufactured at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blind shutter attached to a window of a building.

[0002]

2. Description of the Related Art Blind shutters are attached to windows or glass doors of buildings to change the inclination of the blades or roll them up to adjust the sunlight or light. Recently, they have been attached to the outside of glass doors. I started to block light and heat outside the room.

[0003]

Since such an external blind shields light and heat from the outside of the room, it has a far better heat insulating effect than the blind inside the room.
Moreover, it can also be used as a substitute for shutters to protect glass doors and prevent crime during typhoons. Therefore, it had to have a sturdy structure, especially the blades of the blinds were much thicker and heavier than those for indoor use. For this reason, it is not possible to wind the blade by pulling the string by hand, and it takes time to rotate with a speed reduction mechanism, so I usually use a motor. Therefore, the external blind shutter is generally not very popular because it has high performance but is expensive. Therefore, if you can use a heavy and heavy blade that can be lifted lightly by hand without using a motor, the price will be lower and many people will be able to use the external blind shutter.

[0004]

Therefore, if a weight having the same weight as the weight of the blade is suspended in balance with the blade, the blade can be lifted lightly by hand.

[0005]

The operation will be described with reference to FIG. 1 showing an embodiment of the present invention. First, like a normal blind, several blades (1) are arranged in parallel at equal intervals, and both end surfaces in the width direction of the blades. Are connected with string A (2) at about two points and suspended. Then, make a hole in the center of both ends of the blade and pass the string B (3) through
Tie the end of the string B to the last blade. Therefore, when the string B is wound up, the blades are sequentially piled up from the bottom. Next, FIG. 2 (a) shows a state in which all the blades are lowered, FIG. 3 (a) shows a state in which the blades are wound up about half, and FIG. 4 (a) shows a state in which all the blades are wound up.

Considering the weight of the blades at this time, when all the blades are lowered, the weight of the blades (1) is entirely hung on the string A (2) and the string B (3) sags. Does not take weight. Next, when the blade is wound about half, the weight of only the wound blade is applied to the string B (3), and when all the blades are further wound, the weight of all the blade is applied to the string B (3). Then, a weight (5) with a heavy chain (4) attached thereto is hung on the sprocket (6) as a weight balanced with the changing weight of the blade.

In FIG. 2 (b), the weight (5) and the heavy chain (4), which are lowered on both sides of the sprocket, have exactly the same weight. Therefore, there is no force to turn the sprocket. In Fig. 3 (b), since the weight of a heavy chain comes to the weight by about half, the weight side becomes heavier by the weight, and a force acts to rotate the sprocket to the weight side. In FIG. 4B, since the weight of the heavy chain is almost entirely toward the weight, the weight side becomes the heaviest and the sprocket is strongly tried to turn to the weight side. Therefore, as the blade is wound up, the weight on the weight side also increases in proportion to the increasing weight of the blade, so that both are constantly balanced and almost no rotational force is applied to the shaft.

[0008]

EXAMPLE An example of the present invention will be described with reference to FIG.
Just like a normal blind shutter, a shaft (8) is provided in the upper frame of the frame (7), and several blades (1) are provided in the frame.
Are arranged in parallel at equal intervals, and both end faces in the width direction of the blade are
The strings A (2) are connected to each other, and both ends of the string A are tied to the friction wheel (9) attached to the shaft. Then, make a hole in the center of almost both ends of the blade and pass the string B (3), tie the end of the string B to the blade of the final end, and tie the other end to the winding wheel (10) also attached to the shaft. .. Therefore, by rotating the bevel gear (11) that intersects the shaft with the string C (12), the winding wheel rotates, and the blades sequentially rise from the lower side.

Next, sprockets (6) are attached to both ends of the shaft, and a heavy chain (4) is attached to the weight (5) on the sprockets.
Hanging the connected object and hang it in the vertical frame on both sides. At this time, as described in "action", the weight of the blade and the weight of the object connecting the weight and the chain are always balanced, so if the string C is pulled, the shaft rotates around the shaft with a light force to raise the blade. In addition, the fact that the blade can be opened and closed by attaching another string to the friction wheel is the same as with ordinary blinds.

[0010]

EFFECTS OF THE INVENTION Conventionally, since it is heavy to raise by hand, the blind shutter, which was electrically operated, can be raised lightly by hand by the balance mechanism according to the present invention. It has the effect of making it cheap.

[0011]

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a state diagram of blades (a) and weights (b) when the blades are lowered in the embodiment of the present invention.

[FIG. 3] Similarly, when the blade is raised halfway, (a) is the blade,
(B) is a state diagram of the weight.

[Fig. 4] Similarly, when all the blades are raised, (a) is the blade,
(B) is a state diagram of the weight.

[Explanation of symbols]

1 Blade 2 String A 3 String B 4 Heavy Chain 5 Weight 6 Sprocket 7 Frame 8 Shaft 9 Friction Wheel 10 Winding Wheel 11 Bevel Gear 12
String C

Claims (1)

[Claims] 1. A plurality of blades (1) are arranged in parallel in a frame (7) at equal intervals, and two end surfaces in the width direction of the blades are connected by a string A (2) at about two places. Both ends of the blade are provided with shafts (8) in the upper frame, and the blades are suspended by attaching them to the friction wheel (9) attached to the shafts. 3) through which the end of the string B is tied to the blade at the final end, and the other end is also provided on the shaft (10)
To attach the sprocket (6) to both ends of the shaft, hang a weight (5) with a heavy chain (4) on the sprocket and hang it in the vertical frame on both sides. String C hung on the bevel gear (11) that intersects with the shaft
Blind shutter that pulls (12) to wind or lower the blade, and pulls the string attached to the friction wheel to open and close the blade.