JP3236237B2 - Light shielding film device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light shielding film device,
In particular, the present invention relates to a light-shielding film device in which no gap is formed between a light-shielding film in a closed state and a frame.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view showing an example of a conventional light shielding film device 50 mounted on a window frame sash or the like. In the light shielding film device 50 shown in the figure, a guide rail member 52 is provided upright at a position lateral to the light shielding film 51. Although not shown, a winding drum for winding the light shielding film 51 and a winding motor for rotating the winding drum are housed in the light shielding film winding box 53. The light-shielding film 51 can be moved up and down (open and closed) by forward and reverse rotation driving of the winding motor. A leading member 54 is provided at the lower end of the light shielding film 51.
Is attached. When the light shielding film 51 moves up and down, the leading member 54
Are guided by the guide rail member 52 and move up and down.
The light-shielding film 51 is given a predetermined tension by its own weight of the leading member 54 so that wrinkles and the like do not occur. FIG. 6 shows a state where the light-shielding film 51 is lowered halfway. At this time, as shown in FIG. 6, a strip-shaped gap C having a small width is formed between the guide rail member 52 and the light shielding film 51 along the vertical direction. This gap C is a guide member guide 55 accommodated in the guide rail member 52 as shown in FIG.
The length is substantially equal to the length of the connecting portion between the first member and the leading member. With the light shielding film 51 having such a configuration, even if the light shielding film is completely lowered,
External light shines into the floor from this gap,
The reflection 56 occurs on the floor or the like. Therefore, a sufficient effect cannot be obtained in blocking external light.

Therefore, as shown in FIG. 8, a light shielding film device having a locking projection attached to a side end of the light shielding film has also been developed. In this light-shielding film device 60, a resin locking projection 65 is fixed to a side end portion of the light-shielding film 66 of the film body by bonding means such as pressure bonding or adhesion. The guide rail 61 for supporting the film end of the light-shielding film 66 is made of an extruded aluminum material, and has an inner rail 63 through an elastic support member 62 therein.
Is arranged. The end of the light shielding film 66 is inserted from the slit 63a so that the locking projection 65 is located in the inner rail 63. At this time, the inner rail 63 is held by the elastic support member 62 so as to generate a predetermined urging force from the guide rail 61. For this reason, a predetermined tension acts on the light shielding film 66 via the locking projection 65, and the leading member 68 is also guided by the opening 67 of the guide rail 61. With such a structure, it is possible to prevent a gap from being formed between the light shielding film 66 and the guide member 68 and the guide rail 61. Thereby, the light shielding film 66
When light is dropped, external light can be completely blocked.

[0004]

In the light-shielding film device 60 shown in FIG. 8, it is possible to surely block the irradiation of light from the outside. However, since the locking projection made of resin is attached to the entire length of the side end of the light shielding film, when the light shielding film is wound up, the end of the light shielding film wound up is thick due to the thickness of the locking projection. turn into. For this reason, there is a problem that the long light shielding film cannot be wound. Further, as described above, it is necessary to press-fit the locking projection, which is a separate component, to the entire length of the light-shielding film. Further, the inner rail 63 is supported in the guide rail 61 via an elastic support member 62.
For this reason, there are also problems that the number of parts is large, the assembly of the members is complicated, and the cost is high. Further, since a tensile force is always applied to the locking projection, there is a possibility that the joint portion may be damaged.

Accordingly, an object of the present invention is to provide a light-shielding film device which solves the above-mentioned problems of the prior art, has a simple structure using inexpensive members, and can reliably block external light. Is to do.

[0006]

In order to achieve the above-mentioned object, the present invention is capable of being opened and closed by a predetermined winding mechanism, and has a side end portion and a detachment prevention band formed of a thin film.
Welded through a thermoplastic resin sheet,
A portion of the thermoplastic resin sheet melts along the side edge
A light-shielding film having a lump formed so as to protrude into a streak, and the side end portion provided on a side of the light-shielding film and including the lump through a slit formed along a longitudinal direction thereof. And a guide member attached to the lower end of the light shielding film so as to be guided by the guide rail when opening and closing the light shielding film.

[0007]

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a light-shielding film device according to the present invention will be described below with reference to the accompanying drawings. FIG.
1 is a perspective view showing a part of a light shielding film device 10 of the present invention. In the light-shielding film device 10 shown in FIG. 1, a state in which the light-shielding film 12 is pulled out halfway from the winding box 11 is shown. A leading member 13 similar to that shown in FIG. 6 is also attached to the lower end 12a of the light shielding film 12.
The light shielding film 12 pulled out by the weight of the leading member 13
Is applied with a predetermined tension so that a wrinkle or the like does not occur in the film body. Also, both side edges 12b of the light shielding film 12
Is inserted into the box rail 24 of the guide rail 20. For this reason, no gap is formed at the side end 12b of the light-shielding film 12, so that when the light-shielding film 12 is lowered, it is possible to completely prevent external light from entering the room.

The above-described leading member 13 and guide rail 20
2 and 3 will be described in detail with reference to FIGS. The leading member 13 and the guide rail 20 are both made of extruded aluminum. FIG. 2 shows a partially cut-out guide rail 20 and a box rail 24 integrally formed with the guide rail 20.
And a guide bush 14 guided by the box rail 24, and the leading member 1 to which the guide bush 14 is attached.
3 and a slit 24a of the box rail 24.
3 shows a part of the light shielding film 12 which is locked.

Among these, the guide rail 20 has a base plate 21 fixed to a fixing portion 1 such as a cubic (not shown) with screws 2 as shown in a plan sectional view of FIG. It is composed of two cover flanges 22 formed apart from each other and a box rail 24 supported and arranged by a mounting flange 23 in a space sandwiched between the cover flanges 22. A slit 24a is formed along the longitudinal direction at the center position in the width direction of the other end of the box rail 24 fixed to the mounting flange 23. The film end of the light shielding film 12 is accommodated in the slit 24a.

As shown in FIGS. 3 and 4, a strip-shaped film material of the same material as the film material of the light-shielding film 12 is welded by a welding machine to form an overlap portion 15 at the film edge of the light-shielding film 12. I have.
In the present embodiment, a woven fabric in which a vinyl chloride resin thread is densely woven to enhance light-shielding properties is used as the film material. Light shielding film 12
The side end 12b of the light-shielding film 12 is thickened by welding a detachment prevention band 16 made of a band-shaped film material to the side end 12b of
The side end 12b of the light shielding film 12 does not come out of the slit 24a of the box rail 24. In order to reliably prevent the end of the light-shielding film 12 from coming off from the slit 24a, a lump 17 made of resin is formed along the longitudinal direction of the light-shielding film 12 at the end of the overlapping portion 15 of the light-shielding film 12. I have. This lump 17 is the inner end 1 of the strip 16
It is formed continuously along the extension direction of the film along 6b.
The lump 17 rises from the end of the overlapping portion 15 in a bump shape. The thickness of the film is sufficiently larger than the width of the slit 24a of the box rail 24, so that the film end surely has the slit 2a.
4a.

Here, the processing of the overlapping portion 15 will be described with reference to FIG. First, as shown in FIG.
A film material serving as a separation prevention band 16 is combined with a film end of the light shielding film 12. At this time, a thermoplastic resin sheet 19 is sandwiched between the two film materials along the inner end 12b of the detachment prevention band 16. In this embodiment, a thin film-shaped polypropylene sheet 19 is used as the thermoplastic resin sheet 19.
Has been adopted. With the polypropylene sheet 19 interposed therebetween, the end of the light-shielding film 12 and the stripping prevention band 16 are sandwiched and heated by a welding machine W as shown in FIG. As a result, the polyvinyl chloride resin, which is the material of the light-shielding film 12 and the separation prevention band 16, and the polypropylene resin are integrally surface-bonded by welding. At this time, the molten resin of the polypropylene sheet 19 protrudes from the end 16 b of the stripping prevention band 16, and the above-mentioned lump 17 is formed. In the present embodiment, the width of the detachment prevention band 16 is set to about 20 mm, and the lump 17 formed by melting the resin has a width of 2.0 to 2.5 mm.
3.0 mm or more with respect to the slit width of. It is needless to say that various materials can be used as long as the thermoplastic resin sheet 19 is capable of forming the lump portion 17 by melting the resin with the welding operation by the welding machine W.

FIG. 3C shows a separate detachment prevention band 1.
6 shows a modified example in which the end portion of the light-shielding film 12 is folded back to form an overlapping portion 15. This eliminates the need for the film material of the detachment prevention band 16 and further reduces the number of materials. Note that the width of the above-described detachment prevention band 16 and the folded portion 15 can be further reduced according to the standard of the welding machine W and the like.

Next, the shape of the guide bush will be described with reference to FIG. The above-mentioned overlapping portion 15 is formed at the general portion of the film end of the light shielding film 12 so that the film end does not come off from the slit 24a of the box rail 24. Further, in order to reliably guide the leading member 13 attached to the lower end of the film body, a guide bush 14 as shown in FIG. It is fixed. The guide bush 14 is a rectangular tubular member slidably mounted on the outside of the box rail 24 as shown in FIG. 3, and has an inner dimension slightly larger than the outer dimension of the box rail 24 described above. . The guide bush 14 is an aramid resin molded product, has a low friction coefficient, and has a high resistance to abrasion due to sliding. When the light-shielding film 12 slides in the up-down direction, the guide bush 14 is moved by the box rail 24 of the guide rail 20.
Slides smoothly along the outside of the member, and the leading member 13 moves up and down while maintaining the horizontal position. Therefore, the film body can be smoothly moved up and down without applying an extra load to the film body.

[0015]

As is apparent from the above description, according to the present invention, there is an effect that external light can be reliably blocked by a light-shielding film composed of a small number of components.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an embodiment of a light-shielding film device according to the present invention.

FIG. 2 is an enlarged perspective view showing a cutout portion of the light shielding film device in an enlarged manner.

FIG. 3 is a plan cross-sectional view showing a support state of a side end of a light shielding film of the light shielding film device.

FIG. 4 is a partial cross-sectional view showing a configuration of an overlapping portion at a side end of a light shielding film of the light shielding film device.

FIG. 5 is a perspective view showing a shape of a guide bush of the light shielding film device.

FIG. 6 is an overall perspective view showing an example of a conventional light shielding film device.

FIG. 7 is a partially enlarged view showing a gap portion of the light shielding film device shown in FIG. 6;

FIG. 8 is a plan sectional view showing an example in which a side end of a light shielding film of a conventional light shielding film device is accommodated in a guide rail.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Light-shielding film device 12 Light-shielding film 13 Lead member 14 Guide bush 16 Detachment prevention band 17 Lump part 19 Thermoplastic resin sheet 20 Guide rail 25 Box rail

Claims (1)

(57) [Claims] 1. A thin film-like heat- opening device which can be opened and closed by a predetermined winding mechanism, and has a side end portion and a detachment prevention band.
Welded through a plastic resin sheet, from the welded part
Part of the thermoplastic resin sheet melts along the side edge
A light shielding film having a lump formed so as to protrude into a streak shape, and the side end including the lump is provided on a side of the light shielding film and passing through a slit formed along a longitudinal direction thereof. And a guide rail that can be accommodated therein, and a guide member attached to a lower end of the light shielding film so as to be guided by the guide rail when opening and closing the light shielding film.