Static structures (e.g. – buildings) – Frangible section or means
Patent
1977-11-09
1980-04-08
Leppink, James A.
Static structures (e.g., buildings)
Frangible section or means
291635R, 295272, 404 10, E04C 100
Patent
active
041965507
ABSTRACT:
A post for traffic signs, electrical or telephone lines, lighting fittings and the like adapted to have minimum resistance when being hit by vehicles and the like, but sufficient stability under normal conditions, having a pipe with a series of intermittently arranged longitudinal, longish and scattered weakened slot-like portions and a covering layer enclosing the pipe and circumferentially stabilizing the pipe portions separated by the weakened portions.
REFERENCES:
patent: 701426 (1902-06-01), Tuttle
patent: 724744 (1903-04-01), Schratwieser
patent: 3853418 (1974-12-01), Druin
patent: 3869778 (1975-03-01), Yancey
patent: 3987593 (1976-10-01), Svensson
Flocks Karl W.
Leppink James A.
Raduazo Henry E.
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