DE1256594B - Table-like lamp cover - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

F21v

German: 4 b -9/01

Number: 1256 594

File number: W 25933IX a / 4 b

Filing date: July 3, 1959

Opened on: December 21, 1967

The invention relates to a panel-shaped lamp cover with panels made of translucent Plastic and relates to such a cover, the panels of which are arranged like a honeycomb, close together, have kettle-like depressions, the side walls of which form hollow ribs.

In the case of such lamp covers, with the highest possible light permeability, a uniform diffusion of the light, with the greatest possible rigidity of the plates, can be achieved. Since on the one hand the light transmission changes inversely proportional to the panel thickness, on the other hand but within wide limits the rigidity changes proportionally to the plate thickness, is an ideal one Solution of the problem just described is not possible.

In the case of luminaire covers in plate form, it is known to form a light grid, a translucent one Plate with a more or less large number of truncated cones or truncated pyramids To provide hollows. These troughs have flat side walls and flat floors, so that the Light reflection on the plate can be precisely influenced and a maximum light yield with good diffusion the light can be turned off. In this known arrangement, the bottoms of the Wells or the kettle-like depressions are made of translucent material or except for one Be removed from the edge so that light can escape freely downwards.

However, this known light cover plate has the disadvantage of poor stability, since the plate very easy to bend because of the notches running between the trough-like or bowl-like depressions is.

It is the object of the invention to create such a light cover, which, like the well-known lamp cover plates, has good light transmission and diffusion, on the other hand, a much greater rigidity, d. H. a much larger section modulus against bending. According to the invention this is achieved in that an upper and a lower Plate, lying symmetrically to one another, are connected to the bottoms of their wells.

The invention makes itself the in the production of plate-shaped strength bodies from two or use more wall parts known arrangement in a corresponding modification, in which the walls with Indentations are provided, which are firmly anchored together at their opposite vertices are. By using pyramidal or cone-shaped luminaire covers

Applicant:

Bertram Arnold Wilson, Erie, Pa. (V. St. A.)

Representative:

Dipl.-Ing. J. F. Wochinger, patent attorney,

Munich 23, Clemensstr. 30th

Named as inventor:

Bertram Arnold Wilson, Erie, Pa. (V. St. A.)

Claimed priority:

V. St. v. America 7 July 1958

Truncated depressions are a perfect light diffusion with good light transmission achieved, as the most suitable, according to the optical constants of the material used, precisely defined angle of inclination of the side walls can be set and the flat walls of the Wells have a perfect light transmission. In the case of known strength bodies The spherical cap-like depressions used, on the other hand, would result in a much more uncontrollable scattering and reflection occur, particularly in view of the changing distances of the through the Reflective surfaces formed on both plates would considerably reduce the light transmission.

The invention is explained in more detail below with reference to the drawings using an exemplary embodiment explained. In the drawings shows

F i g. 1 is a plan view of a cover panel used for light diffusing ceilings; from below, and

F i g. 2 shows a section through an edge of the panel.

The board is made up of two plates 1, 2 made of translucent or transparent plastic, e.g. Polystyrene or polyvinyl chloride, with polyvinyl chloride being preferred for those cases where strength matters. The two are along the circumferential edges of the edge flanges 3 α Plates 1, 2 face to face connected to one another and can be placed on a T-shaped support 3, 4 are supported.

Each plate 1, 2 has a section 5 which is recessed to the plane of the peripheral edges 3 α of the plate. The recessed section 5 consists of the side

709 709/38

Claims (2)

wall 6, which is located on the edge of the plate, and from the bottom 7, which lies in a plane parallel to the edge of the plate. In the bottom 7, depressions 8 are formed, which extend backwards to the plane of the plate edge. The depressions 8 are arranged in such a way that their centers are equidistant from one another. The center lines which connect the individual depressions 8 to one another extend both at an angle and transversely to the plate, the depressions 8 of adjacent transverse rows being staggered with respect to one another, whereby a partial nesting of the depressions 8 is obtained. As a result, the area of the bottom 7 can be provided with depressions in a larger ratio, with a sufficiently smooth bottom part still remaining between the adjacent depressions, as is indicated at 9. The side walls of adjacent depressions 8 form hollow, the light-guiding ribs according to FIG they touch face to face and their recessed sections 5 coincide with one another, as shown in FIG. 2, the bottoms 10 of the depressions 8 are in contact with one another and can easily be united with one another, which can be done, for example, by heat sealing the plastic plates. Viewed from the opposite side, the recess 8 appears as a dome, the bottom 10 of the recess being the dome or the ridge of the dome. The central part of the united walls 10 can be punched out at 11 within the united area so as to improve the light emission and light transmission. In addition, the sound attenuation is improved, which is important for ceiling panels. Around the entire circumferential edges and around the holes 11, the two panels of the panel are tightly connected to one another. The board can be easily cleaned by dipping it in a cleaning solution or using other cleaning methods. The recessed portions 5 and the recesses 8 of the two plates 1, 2 can easily be produced in a single work step by being formed by vacuum. The depressions 8 shown have a round cross-section. It is preferable to other cross-sectional shapes because the round cross-section is easiest and cheapest by a casting process, pressing process or the like. Can be produced. However, other cross-sectional shapes can also be used for the depressions 8. Patent claims: 1. Panel-shaped luminaire cover with panels made of translucent plastic, which are honeycomb-like have arranged, closely spaced, kettle-like depressions, the side walls of which Form hollow ribs, characterized in that an upper and a lower plate (1,2), lying symmetrically to one another, connected to the bottoms (10) of their wells are. 2. Light cover according to claim 1, characterized in that in a known per se Way, the bottoms (10) of the wells (8) are removed up to one edge. Considered publications:
German utility model No. 1700 863;
French patent specification No. 1 047151. 1 sheet of drawings 709 709/38 12.67 © Bundesdruckerei Berlin