Energy absorbing impact barrier

Details Energy absorbing impact barrier Energy absorbing impact barrier

1993-12-29

1995-11-07

Graham, Matthew C.

Railway switches and signals

Electric automatic highway signals, mine doors, and gates

Car-actuated controller

404 11, 49 9, 49131, 267279, E01F 1304, B60G 1122

Patent

active

054641772

ABSTRACT:
An energy absorbing motor vehicle barrier includes a collapsible energy absorption assembly which is stored in a vault in the ground. Upon deployment, the energy absorption apparatus is lifted out of its vault, where it thereby expands and deploys. The energy absorption apparatus includes four stages of pairs of elastomeric torsion springs configured into scissors arrangements, with each stage having a progressively higher effective spring rate, to thereby decelerate a vehicle which strikes the apparatus.

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patent: 4822207 (1989-04-01), Swahlan
patent: 4824282 (1989-04-01), Waldecker
patent: 4887934 (1989-12-01), Kramer
patent: 5095840 (1992-03-01), Kramer

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