Buckles – buttons – clasps – etc.
Patent
1975-07-14
1976-08-31
Peters, Jr., Joseph F.
Buckles, buttons, clasps, etc.
240103R, 240106R, F21V 700
Patent
active
039783324
ABSTRACT:
A lighting apparatus includes a housing with an inner reflecting surface and with a lateral curved wall the profile of which is made up of several circular arcs with distinct radii and distinct centers. The housing has disposed in its interior a light source, and between the same and the mouth of the housing there is disposed a prismatic device the dimensions of which are in general somewhat larger than the area occupied by the light source. The prismatic device has a lower face the surface of which is plane and has on its top face a series of adjacent salient ribs the cross section of which is triangular and the top edges of which are replaced by a portion of rectangular cross section the upper surface of which is opaque. When the light source is constituted by parallel fluorescent tubes the housing then has a vertical symmetry plane parallel to the fluorescent tubes, its lateral walls are cylindrical surfaces and the prismatic device is rectangular with the triangular ribs disposed longitudinally. When the light source is a discharge bulb, the housing then has a symmetry axis which passes through the light emitting source of the bulb, the lateral surface of the housing is a rotary surface and the prismatic device is circular with its triangular ribs circular and concentric.
REFERENCES:
patent: 3265887 (1966-08-01), Wince
patent: 3329812 (1967-07-01), Harling
patent: 3721818 (1973-03-01), Stahlhut
patent: 3735124 (1973-05-01), Stahlhut
patent: 3832541 (1974-08-01), Bassett et al.
patent: 3866036 (1975-02-01), Taltavull
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