Retractable speed bump

Details Retractable speed bump Retractable speed bump

1980-08-21

1982-08-03

Byers, Jr., Nile C.

Road structure, process, or apparatus

Traffic steering device or barrier

49131, E01F 1300

Patent

active

043425259

ABSTRACT:
A retractable speed bump mounted in a street, road or roadway for controlling the speed of vehicles, which includes a generally rectangularly-shaped encasement containing upper and lower, relatively movable, wedge-shaped members slidably fitted in the encasement and configured to cooperate by means of friction-reducing means such as ball bearings in adjacent, inclined faces to selectively raise the top of the upper member above street or road level responsive to activation of a hydraulic cylinder attached to the encasement and the lower member.

REFERENCES:
patent: 1497093 (1924-06-01), Doyle
patent: 1960376 (1934-05-01), Gilman
patent: 1994027 (1935-03-01), Poston
patent: 3134184 (1964-05-01), Neblett
patent: 3266013 (1966-08-01), Schmidt
patent: 3530775 (1970-09-01), Bowersox
patent: 4012156 (1977-03-01), Turner

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