Claims
- 1. A heat retention device, comprising
- a plastic foil carrier transparent to visible light and subdivided in at least some areas into alternating perforated (11) and non-perforated (14) areas in order to alter its mechanical properties,
- an atomized metal coating, reflective to long-wave heat radiation, deposited on said foil carrier, and
- means (13) for hanging said device in proximity to a vertical surface, wherein, in accordance with the invention,
- the plastic foil is perforated (11) in a striped pattern (FIG. 1) in order to create curtain-like folds in the vicinity of said perforations (FIG. 2) when it is hung.
- 2. A heat-retention device as defined by claim 1, characterized in that the width of as well as the distance between the perforated areas (11) are between 20 mm and 100 mm.
- 3. A heat retention device comprising
- a plastic foil carrier transparent to visible light and subdivided in at least some areas to alter its mechanical properties,
- an atomized metal coating, reflective to long-wave heat radiation, deposited on said foil carrier, wherein
- a plastic foil cut apart into the two sets of strips (15, 16), having longitudinal axes orthogonal to each other, is joined into a mat (FIG. 3) by means of interweaving said orthogonal sets so as to expose on a first side of said device one face of each of said strips at first alternating portions thereof, and to expose on a second side of said device the opposite face of said strip at second alternating portions of said strip.
- 4. A heat-retention device as defined by claim 3, characterized in that the strips (15, 16) have a width of approximately 3 to 15 mm.
- 5. A heat-retention device as defined by claim 3 or 4, characterized in that the strips (16) of the coated plastic foil are woven into a wide-mesh fabric curtain (17) (FIG. 4).
- 6. A heat retention device as defined by claim 3, wherein the foil strips have a width of approximately 3 to 15 mm.
- 7. A heat retention device as defined by claim 3, wherein each of said alternating portions is substantially rectangular in configuration.
- 8. A heat retention device as defined by claim 9, wherein the foil strips have a width of approximately 3 to 15 mm.
- 9. A heat retention device comprising
- a plastic foil carrier transparent to visible light and subdivided into strips (15,16), said strips being separated by peripheral zones (18), to alter its mechanical properties,
- an atomized metal coating, reflective to long-wave heat radiation, deposited on said foil carrier, and
- a wide-mesh fabric curtain (17) interlaced with said foil strips, wherein (FIG. 4)
- the plastic foil strips (15,16) and the curtain (17) are secured together in the peripheral zones (18).
- 10. A heat retention device as defined by claim 9, wherein the foil strips are welded to the curtain.
- 11. A heat retention device as defined by claim 9, wherein the foil strips are glued to the curtain.
- 12. A heat retention device as defined by claim 9, wherein the foil strips are sewn to the curtain.
- 13. A heat retention device as defined by claim 9, wherein each of said peripheral zones is substantially rectangular in configuration.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 3128487 |
Jul 1981 |
DEX |
|
ADVANTAGES OF THE INVENTION
This application is a division of application Ser. No. 474,591, filed Mar. 11, 1983, now abandoned.
The invention is based on a heat-retention device for windows, doors and the like in the form of a curtain or roller shade, having a plastic film as a carrier and having at least one coating, which has a high reflective capacity for heat radiation from the interior of the room. A heat-retention device of this kind is known in principle from German Examined Published Application DE-AS No. 2,703,688 and corresponding U.S. Pat. No. 4,158,718, where a protective device for light-transmissive, closed window or door openings is described. This known heat-protection device is also supposed to be usable such that it is suspended freely and loosely at a distance from a window or door opening in the manner of a roller-shade web or a curtain, but this is only conditionally possible. Although the known heat-retention device has the same object, that is, to reflect long-wave radiation emitted from the interior of a room toward the windows or doors or in other words to prevent the loss of heat to the outside, there arc some important hindrances to the use of the known foil directly as a curtain or roller shade, resulting from the mechanical properties of the plastic foil or of the coating. The known foil, in particular a polyester foil which is preferably used for technical and visual reasons, does not drape like fabric; instead, because of its elasticity, it does not hang in folds. Furthermore, the known heat-protection foil does not remain entirely smooth, which is a consequence of its being fastened and held at the edge and causes visually unattractive bulges. The foil flutters in drafts, causing disruptive reflexes. Furthermore, soiling is easily seen, whether on the coating or on the uncoated side of a smooth foil, which is especially disadvantageous since the foil cannot be cleaned as can a window pane or a fabric curtain.
The heat-retention device according to the invention and having the plastic foil subdivided, at least in some areas, in order to alter its mechanical properties, overcomes the disadvantages described above and makes it possible to use a heat-protection foil known per se, for instance a polyester foil having a vapor-deposited or atomized metal coating or a coating of indium oxide, in an esthetically pleasing form and without disruptive secondary effects inside buildings in the manner of a curtain or a roller shade; as a result, the field of application of energy-saving heat-protection foils is broadened significantly.
By means of perforating the foil or narrowing it into strips, advantageous embodiments of the heat-retention device having the aforementioned subdivisions of the foil are possible. Embodiments which have proved to be particularly advantageous are, on the one hand, a plastic foil perforated preferably in a striped pattern and, on the other, a heat-retention device produced by combining individual strips together. In the case of a plastic foil perforated in a striped pattern, the mechanical properties required for use as a roller shade or curtain are attained by the reduction of elasticity in the area of the perforations. In the case of a mat made up of plastic foil strips, which can be manipulated like a fabric curtain, the elastic restoring forces in the foil are reduced to such an extent that the problems described above no longer occur. An advantageous and particularly economically produceable compromise between a known, one-piece heat-protection foil and a heat-retention device made up of individual strips is attained by partially decreasing the mechanical cohesion of the plastic foil by removing material or compressing it by stamping, resulting in a device which has properties similar to those of the device made up of joined strips.
US Referenced Citations (5)
Foreign Referenced Citations (2)
| Number |
Date |
Country |
| 178460 |
Jul 1964 |
SUX |
| 606862 |
Aug 1948 |
GBX |
Continuations (1)
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Number |
Date |
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| Parent |
474591 |
Mar 1983 |
|
Patent Grant
4789582
