Road structure – process – or apparatus – Apparatus – Rotating drum – roller or tire
Patent
1976-07-15
1978-02-07
Corbin, John K.
Road structure, process, or apparatus
Apparatus
Rotating drum, roller or tire
350 97, 404 6, G02B 5128
Patent
active
040724034
ABSTRACT:
A new method for producing retro-reflecting assemblies of the type comprising a transparent globule having an essentially part-spherical upper portion uncoated for light impingement, and a lower portion associated to a monolayer of focusing and reflective microspheres, the method comprising forming said globule by subjecting a sheet thermoplastic material to heat and pressure in the bite of counter-rotating forming rollers to provide an essentially planar intermediate product having oppositely located bulges at either faces thereof, the globules being obtained by subdividing said product in parts each comprising a pair of opposite bulges. The invention comprises improved assemblies comprising each an asymmetrical globule having the monolayer of microspheres associated to its essentially bottom face and to its peripheral toroidal side face of radius of curvature smaller than that of its upper bulging portion exposed for light impingement.
REFERENCES:
patent: 1872643 (1932-08-01), Bone
patent: 3781083 (1973-12-01), Eigenmann
patent: 3894791 (1975-07-01), Eigenmann
patent: 3964820 (1976-06-01), Eigenmann
Corbin John K.
DELOS Reyes B. W.
Striker Michael J.
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