Stoves and furnaces – Tool having fluid fuel burner – Curling iron
Patent
1983-05-20
1985-05-21
Green, Randall L.
Stoves and furnaces
Tool having fluid fuel burner
Curling iron
350263, F24J 302, G02B 2700
Patent
active
045179603
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a solar protection device, i.e. a device for providing protection against sunlight comprising a plurality of slats made of light-permeable material which on one side have a flat base surface and on the other side have a prismatic structure, and which are arranged one beside another in a window opening so as to be rotatable about parallel longitudinal axes.
An efficient solar protection device must take into account the fact that the angle of incidence of sunlight changes over a very wide range in dependence upon the time of day and the time of year. In known solar protection devices which are permanently installed, this range can be covered only by simultaneously screening off the desired daylight. In the interest of a better use of the daylight, it has been proposed in a solar protection device disclosed in German Patent Specification No. 16 83 284 incorporated herein by reference, that the inclination of the slats should be changed during the day in dependence upon the height of the sun. In the device described in this Specification, the slats on their inner side comprise a plurality of individual prism (triple reflectors) which results in an essentially circular screening zone with a critical angle of about 45.degree.. However, this does not permit a complete screening of the sun's rays during the morning and afternoon.
In a solar protection device described in German Patent Specification No. 19 06 990, incorporated herein by reference the slats are, in contrast, arranged so as to be rotatable about vertical axes and to follow the particular location of the sun during the day by means of a motor drive. In this case, the individual slats are permanently inclined to the horizontal at an angle corresponding approximately to the particular degree of latitude whereby, at least at noon, complete screening from the sun can be achieved, regardless of the time of year.
On the other hand, with this arrangement, it must be accepted that the sun's rays will enter during the morning and evening hours around the summer and winter solstices. A greater disadvantage, however, is the elaborate mechanism and controls required to adjust the individual slats during the day. Finally the approximately circular screening zone means that a large proportion of the high-angle light will be reflected outwards by the slats and cannot enter the room.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a solar protection device having improved lighttransmittance, together with a more effective screening of the sunlight and a simpler construction, than such devices previously proposed.
According to the invention, there is provided a solar protection device comprising a plurality of slats made of light-permeable material and having a flat base surface on one side and a prismatic structure on the other side, said slats being arranged in side-by-side relationship in a window opening so as to be rotatable about respective parallel longitudinal axes, the prismatic structure of said other side of the slats comprising at least one non-reflective prismatic rod, the longitudinal axis of which runs parallel to the longitudinal axis of the slat and whose said faces encloses between them at their outer ends an apical angle of 90.degree.. Preferably each slat consists of a large number of prismatic strips, the adjacent side faces of which abut against one another without gaps.
The device of the invention operates independently of the inclination and alignment of the window surface, and is thus of particular use for installation in the frames of roof windows. In this case, it is expedient to orientate the axes of the slats at right angles to the north-south direction.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be further described with reference to the drawings, in which:
FIG. 1 is the sunshine-exposure diagram of a horizontal surface;
FIG. 2 is a schematic perspective view of a solar protection device in accordance with the invent
REFERENCES:
patent: 3185034 (1965-05-01), Youngblood, Jr.
patent: 3438699 (1969-04-01), Seeger
patent: 3471221 (1969-10-01), Seeger
patent: 4382434 (1983-05-01), Meckler
LandOfFree
Protection device against solar light does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Protection device against solar light, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protection device against solar light will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1532923