Illumination – Light modifier – Translucent or opaque
Reexamination Certificate
2000-02-28
2001-10-30
O'Shea, Sandra (Department: 2875)
Illumination
Light modifier
Translucent or opaque
C362S279000, C362S320000, C362S414000
Reexamination Certificate
active
06309091
ABSTRACT:
BACKGROUND OF THE INVENTION
Lamp shades have often been designed in louvered form to control the amount and direction of light passing out of the shade. Adjustable lamp shades of that general class are shown in U.S. Pat. Nos. 5,276,601, 2,670,431, 2,437,825 and 2,230,186. In all such designs a plurality of louvers or shutters are employed in a given typically circular annulus around a central light source of the lamp, and the louvers or shutters are each of rigid form. Collapsible lamp shades are also well known as in U.S. Pat. Nos. 2,771,544 and 2,625,648 where telescoping rings of rigid material can drop into position around the light source.
In none of these prior art lamp shade designs does a translucent flexible and stretchable annular sheet surround the light source. It is a principal purpose of the present invention to provide just such a translucent shade around the light source, one that is flexible and stretchable and which is positioned around the light source to give the desired effect on the amount and direction of emitted light.
SUMMARY OF THE INVENTION
A lamp shade is provided by the invention in combination with a lamp base and a light source. The shade, base and light source are all on a common axis. Surrounding that axis is a pair of first and second ring elements of large and small diameter respectively. One of the ring elements of the pair is fixed and the other is axially movable in relation to the lamp base. A flexible and stretchable translucent annular sheet is included having an outer edge portion secured to the first ring element and an inner edge portion secured to the second ring element. By this structure the movable ring element is displaceable along the axis to establish a selected position of the flexible annular sheet in relation to light from the light source.
In a preferred form the ring elements are circular and the annular sheet is of stretchable polyester fabric.
There may be a plurality of pairs of first and second ring elements each with its annular sheet therebetween spaced along the common axis around and above and below the light source. The large diameter ring element of each pair may be fixed with respect to the lamp base and the small diameter ring element may be axially movable. A linkage may connect all of the small diameter ring elements of the pairs to permit all of the small diameter ring elements to be moved equally together in relation to the lamp base.
Alternatively there may be a single pair of first and second ring elements with the flexible annular sheet therebetween. The small diameter ring of that single pair may be fixed with respect to the lamp base and the large diameter ring element may be axially movable. The large diameter ring element then hangs freely by the flexible annular sheet from the small diameter ring element.
REFERENCES:
patent: 2230186 (1941-01-01), Johns et al.
patent: 2435786 (1948-02-01), Klosek
patent: 2437825 (1948-03-01), Kohn
patent: 2625648 (1953-01-01), Zenda
patent: 2670431 (1954-02-01), Bullock
patent: 2771544 (1956-11-01), Lipscomb
patent: 4998192 (1991-03-01), Arndt
patent: 5276601 (1994-01-01), Holzhacker
O'Shea Sandra
Ward John Anthony
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