Fresnell lens and filter for use with computers and the like
First Claim
1. An auxiliary device for a viewing screen housed in a cabinet, comprising a bracket having a first base and an upward projecting member formed with an aperture, first attachment means adapted to attach said first base to the cabinet, an elongated bar, a Fresnell lens, second attachment means for attaching said lens to an end of said bar, a screw having a second base on one side of said member having a pair of prongs extending through said aperture and beyond the side of said first member opposite said one side, said prongs being separated by a gap slightly wider than the thickness of said bar, the sides of said prongs opposite said gap being formed with a first taper tapering outwardly and formed with first threads and an annular nut having a head and a stem having an internal second taper formed with second threads mating with said first threads, whereby tightening said nut forces said prongs toward each other to clamp said bar therebetween.
1 Assignment
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Accused Products
Abstract
A Fresnell lens and filter are disposed in a frame adjustably pivotally attached to a bar extending from a cabinet having a viewing screen for a computer, e.g. The bar is movable to adjust the distance of the lens from the screen and the height of the lens relative to the screen. A clamp for the bar is mounted on the cabinet which, when loosened, permits such adjustment and when tightened fixes the bar in position.
169 Citations
12 Claims
- 1. An auxiliary device for a viewing screen housed in a cabinet, comprising a bracket having a first base and an upward projecting member formed with an aperture, first attachment means adapted to attach said first base to the cabinet, an elongated bar, a Fresnell lens, second attachment means for attaching said lens to an end of said bar, a screw having a second base on one side of said member having a pair of prongs extending through said aperture and beyond the side of said first member opposite said one side, said prongs being separated by a gap slightly wider than the thickness of said bar, the sides of said prongs opposite said gap being formed with a first taper tapering outwardly and formed with first threads and an annular nut having a head and a stem having an internal second taper formed with second threads mating with said first threads, whereby tightening said nut forces said prongs toward each other to clamp said bar therebetween.
- 10. An adjustable support comprising an elongated bar, a member formed with an aperture, a screw having a base on a first side of said member having a pair of prongs extending through said aperture and beyond a second side of said member opposite said first side, said prongs being separated by a gap slightly wider than the thickness of said bar, the sides of said prongs opposite said gap being formed with a first taper tapering outwardly and formed with first threads and an annular nut having a head and a stem having an internal second taper formed with second threads mating with said first threads, whereby tightening said nut forces said prongs toward each other to clamp said bar therebetween.
Specification