| 摘要 |
A motor driven barrier is disclosed for installation on the front end of a school bus. An elongate barrier member is carried in a stowed position adjacent the bus front bumper and upon deployment protrudes forwardly from the bus in approximate alignment with the right side of the vehicle. A motor housing includes brackets for bumper attachment. A reversible electric motor powers a driven shaft through 90 DEG or so to position the barrier. A lost motion drive includes a spiral spring which yields in the event an obstruction is encountered by the arm. A second spiral spring cooperates with the first mentioned spring to locate the barrier in an operatively disposed position forward of the vehicle and permits momentary displacement of the barrier. A pair of switches serve to establish polarity reversing motor circuits with the switches in relay controlled circuits with a driver actuated vehicle door control switch. A barrier mounted light is in circuit with the vehicle's amber light system.
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