Lamp-shade for tubular lamps

Details Lamp-shade for tubular lamps Lamp-shade for tubular lamps

1977-02-22

1978-10-24

Engle, Samuel W.

Illumination

Light modifier

Translucent or opaque

362223, 362260, 362354, 362359, F21V 100

Patent

active

041225112

ABSTRACT:
A lamp-shade for tubular lamps of outer diameter d, comprising two longitudinally extending, in cross sections evenly concavely curved, light reflecting side shade-faces facing each other and arranged on each side of a middle plane containing the axis of the lamp. The shade further comprising a number of light reflecting cross plates extending between the two side shade-faces evenly spaced along the length of the shade. The distance between the lamp and a plane through the lower edges of the side shade-faces being between 1.7 d and 3 d. Each side shade-face being evenly curved from an uppermost portion situated at a level higher than that of the upper side of the lamp and having a minimum distance from said middle plane not exceeding 0.6 d to the lower edge and is near the latter touching a plane parallel to the middel plane in a distance therefrom of between 1.3 d and 3 d. The lower border zone of each side shade-face having a height of between 0.2 d and 0.3 d and is being slightly converging towards said middle plane.

REFERENCES:
patent: 2724047 (1955-11-01), Zurawski
patent: 2990763 (1961-07-01), Frant z
patent: 3169710 (1965-02-01), Lipscomb
patent: 3179797 (1965-04-01), Franck

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