JPS638271B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevating device for a so-called horizontal blind, which is equipped with a plurality of horizontal vanes arranged vertically at regular intervals.

Conventionally, the wing plates of such horizontal blinds are generally raised and lowered by pulling up or lowering a lifting cord connected to the lower plate located at the lowest part of the row of wing plates. be.
In particular, in horizontal blinds of the type that are commonly used these days, in which the blades are raised, lowered, and tilted by a single operating means, the blades are mounted on a horizontal drive shaft mounted in the head box of the blind. The upper end of the lifting cord is attached to the lifting drum, and the upper end of the ladder-shaped support cord supporting the vane is supported on the tilting drum attached to the drive shaft. By rotating the blade manually or electrically, the blades can be raised and lowered and tilted at the same time.

In addition to the general lifting devices mentioned above, recently,
A pair of wheels are arranged above and below the sides of the row of vanes, an annular driving member such as an endless chain is stretched between these wheels, and the lower board is placed at the bottom of the row of vanes. , an elevating device that is connected to the annular drive member and drives the wheel with a motor or the like, and by rotating the drive member, raises and lowers the lower plate and raises and lowers the blind. It has been developed.

In a type of blind that uses the above-mentioned lifting cord and in which the blades are raised and lowered and tilted by one drive shaft, a mechanism is required to idle the tilting mechanism when raising and lowering the blades, but the above-mentioned annular In a type of blind in which the blades are raised and lowered by a drive member, the blade tilting mechanism and the blade lifting mechanism are constructed separately, so there is no need for a mechanism that causes the tilting mechanism to idle when raising and lowering. This has the advantage that no extra load is applied during lifting and lowering operations.

However, in horizontal blinds, when the blades are raised and lowered, the load on the blades increases sequentially as the blades rise, and in models that use lifting cords, the load on the blades that increases in this way increases when the blades are raised and lowered. In those types in which the vanes are raised and lowered by applying cords and rotating an annular drive member, all of the vane load is applied to one vertical portion of the annular drive member. Therefore, as the blades rise, the load on the blades increases sequentially, making lifting and lowering operations difficult, and for this reason, there is a limit to the ability to make blinds with large W x H dimensions. Large-sized blinds are difficult to lift and lower, requiring special lifting equipment, and when using electric power, a high-output motor is required, resulting in a large blind head box and the need for a high-output motor. With use, it has become an expensive blind.

The object of the present invention is to improve the drawbacks of the conventional blind lifting device, and to make it possible to lift and lower blinds of large size with a conventional operating device and a small motor with low output, and to make it possible to lift and lower blinds of large dimensions by raising and lowering the blind. Our aim is to provide blinds that do not become heavy.

The blind lifting device according to the present invention includes a plurality of horizontal vanes arranged vertically at regular intervals, and includes a pair of wheels above and below the sides of the row of vanes. An annular driving member such as an endless chain is stretched between these wheels, and a horizontal lower plate placed at the bottom of the row of vanes is connected to one vertical side of the annular driving member. a plurality of portions connected to each other and providing successively increasing balance weights to the other vertical portion of the annular drive member to balance the weights of the vanes and lower plates that increase sequentially as the vanes rise; It is characterized in that weights are distributed and attached to the drive member.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a blind embodying the present invention, and FIG. 2 is a partially cutaway front view of the blind. In the figure, 1 is the frame of the blind, 2 is the headbox of the blind placed in the upper part of the frame, 3 is a plurality of horizontal wing plates arranged vertically at regular intervals, and 4 is these wings. A lower plate is placed at the bottom of the row of plates, 5 is a ladder-shaped support cord that supports these vanes, and 6 is a tilting drum that supports the upper end of the support cord.

A pair of sprocket wheels 7, 8 are located above and below inside the frame 1 at the side of the row of vanes mentioned above (Fig. 3).
are arranged, and these sprocket wheels 7,
An endless chain 9 is stretched between the chains 8 and 8. In the illustrated embodiment, sprocket wheel 7 is a drive wheel, sprocket wheel 8 is an idler wheel, and wheel 7 is driven by a motor 10 located within the headbox. Above lower plate 4
A connecting shaft 11 protrudes from the side, and this connecting shaft is connected to one vertical portion of the endless chain 9 (the third
figure).

As described above, as the vane rises, the vane is sequentially folded onto the lower plate, and the load on the vane increases sequentially. In order to balance the blade load that increases sequentially in this way, a plurality of weights 12, 12a,
12b, 12c...12n are distributed and attached to the endless chain 9.

Next, the operation of the above-mentioned blind lifting device will be explained. Figure 3A shows the blinds in a lowered state. In this state, the endless chain 9
The sum of the weights of the weights 12, 12a, 12b on the left side is approximately equal to the sum of the weights of the weights 12c...12n on the right side. Then, in order to raise the blind vanes, the drive wheel 7
When the lower plate 4 is rotated counterclockwise in FIG. 3, the lower plate 4 rises and the vanes 3 are successively folded onto it, so that the weight of the vanes increases successively. Along with this, the weights 12c, 12d...12n are connected to the wheel 7.
, and moves to the left one by one, so the sum of the weights on the left side and the sum of the weights remaining on the right side, the wing plate, and the lower plate are approximately balanced, that is, the weight of the sprocket 7 If the weights on the left and right sides are roughly balanced, the drive wheel 7 can be rotated with extremely small torque and the blind can be raised smoothly. When lowering the blind, the load on the vane gradually decreases as the blind descends, and the distributed weight gradually shifts to the right side.
Balanced left and right.

As described above, according to the present invention, even in large blinds, by applying the distributed load of the weight to the drive member so that the load applied to the left and right vertical portions of the annular drive member is almost balanced, The blind can be raised and lowered with a small constant operating force.

[Brief explanation of the drawing]

Figure 1 is a front view of a blind using the device of the present invention, Figure 2 is an enlarged cutaway front view of a part thereof, and Figure 3 is a front view of a blind using the device of the present invention.
Figures A and B are diagrams showing a lifting device according to the present invention. DESCRIPTION OF SYMBOLS 1... Frame body, 2... Head box, 3... Wing plate, 4... Lower plate, 5... Support cord, 6... Tilting drum, 7, 8... Wheel, 9... Endless chain, 10... ...Motor, 11...Connection shaft, 12,
12a, 12b to 12n... Weight.

Claims (1)

[Claims] 1. In a blind lifting device equipped with a plurality of horizontal blades arranged vertically at regular intervals, a pair of wheels are arranged above and below the sides of the row of blades, and these wheels are An annular drive member such as an endless chain is stretched between them, and a horizontal lower plate disposed at the bottom of the row of vanes is connected to one vertical portion of the annular drive member; A plurality of weights are attached to the drive member to provide a balance weight that increases sequentially to the other vertical portion of the annular drive member so as to balance the weight of the wing plate and the lower plate that increase sequentially as the blade rises. A blind lifting device characterized by being installed in a distributed manner.