Patent ID: 7356966
Filing Date: 2008-04-15
Classification: B61L,E01F

Abstract:
1. A railroad grade crossing assembly for inhibiting access to a railroad crossing area, comprising: gate means connectable to a stanchion and movable between a generally upright position to permit access across the railroad crossing and generally horizontal position for inhibiting access across the railroad crossing, further comprising telescopic arm means incorporated into said gate means and being operable to selectively extend and retract from said gate means crossing assembly in response to a control signal; one or more sensors operable to detect the presence of a foreign body in said crossing area and providing a corresponding sensor signal comprising at least one of a leveling switch signal, a railroad crossing system signal, a bump switch signal, a listening device signal, a 45° gate angle detection signal, a time delay before gate extension retry signal, an extension attempt counter signal, an electrical failure detect signal, a sonic object detector signal, an IR object detect signal, and a radar object detect signal; and a programmable controller including a selectively programmable logic, providing said control signal in selective response to said one or more sensor signal according to said programmable logic to cause said telescopic arm to selectively extend and retract.