Patent ID: 6119399
Filing Date: 2000-09-19
Classification: E01F

Abstract:
A parallelogram gate for controlling traffic along a roadway, comprising:(a) an arm assembly movable between a horizonal, roadway-blocking position and a raised position, said assembly including:(1) an elongated, upper rail having a first pivoted end and an opposite free end;(2) an elongated, lower rail parallel to the upper rail, having a first, pivoted and an opposite free end; and(b) a drive assembly for placement on a first side of the roadway, including:(1) a housing;(2) stationary upper rail pivot means disposed within, and attached to, the housing, for pivotally attaching the first end of the upper rail to the housing;(3) a pair of vertically-elongated, laterally spaced-apart channel guides attached to the housing at a location within the housing that is intermediate a lower end of the housing and the upper rail pivot means, each said channel guide having an elongated vertical groove, said grooves being oppositely and symmetrically disposed with respect to one another;(4) movable lower rail pivot means pivotally attached to the first end of the lower rail and disposed within said channel guides for movement within the vertical grooves thereof between a first, lower position and a second, upper position; and(5) linear actuator means attached to the housing for moving the lower rail pivot means within said channel guides.