Manually depressible automatically deployable spring balanced bo

Details Manually depressible automatically deployable spring balanced bo Manually depressible automatically deployable spring balanced bo

1986-03-17

1987-12-29

Friedman, Carl D.

Road structure, process, or apparatus

Traffic steering device or barrier

49 49, E01F 1300

Patent

active

047157429

ABSTRACT:
A bollard type trafficway barrier for arresting vehicles, comprised of a cast in place foundation and a bollard replaceable therein with a spring for lifting the bollard that is directionally oriented with respect to traffic so as to withstand great impacts, and with access for replacement of the bollard, with retraction by manual depression and extension by instantaneous release of potential energy stored in said spring, the bollard being locked in both the retracted and extended conditions, and installation being flush with the grade when retracted and the bollard being released manually or power controlled from a remote location by a vehicle sensor.

REFERENCES:
patent: 3086430 (1963-04-01), Emmel
patent: 3462023 (1969-08-01), Grove
patent: 3660935 (1972-05-01), Boots
patent: 3698135 (1972-10-01), Boots et al.
patent: 4003161 (1977-01-01), Collins
patent: 4320380 (1982-03-01), Berard et al.
patent: 4490068 (1984-12-01), Dickinson
patent: 4576508 (1986-03-01), Dickinson
patent: 4577991 (1986-03-01), Rolow

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