| 摘要 |
An improved sign post assembly ( 10 ) for roadway use is provided wherein a sign post ( 12 ) includes a lower section ( 16 ) adapted for anchoring to the earth, a mating upper section ( 20 ) and a magnetic coupling assembly ( 24 ) for maintaining the sections during normal use while permitting breakaway of the upper section ( 20 ) when the host ( 10 ) is struck by a vehicle. Preferably, the coupling assembly ( 24 ) includes a magnetic body ( 26 ) and a corresponding component ( 28 ) which is magnetically attracted to the body ( 26 ). In order to cause breakaway in a predetermined direction, the coupling assembly ( 24 ) has mating surfaces for the body ( 26 ) and component ( 28 ) which are in a stairstep configuration.
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