Extensible railroad grade crossing gate arm
Crossing gate counterweight adjustment
Railroad grade crossing assembly Patent #: 6618993
ApplicationNo. 11150702 filed on 06/13/2005
US Classes:246/125, ELECTRIC AUTOMATIC HIGHWAY SIGNALS, MINE DOORS, AND GATES246/127, Gates and doors246/293, Highway crossing49/49WITH TRAFFIC DIRECTOR OR CONTROLLER; E.G., ONE-WAY
ExaminersPrimary: Le, Mark T.
Attorney, Agent or Firm
International ClassB61L 23/00
AbstractA retractable gate comprising a movable arm gate having multiple sections which nest or telescope into each other when parked (e.g. upright), and extends into a full length blocking position as it is deployed. The gate arm sections are deployed by the movement of one of the arms, e.g. the outer one section, relative to the ground or a stationary support member and is joined to the stationary support member by a pivot point or bearing, and is connected to the stationary support or ground by a cable connection (or equivalent) which powers the arm sections into extended or retracted positions by movement of the gate about the pivot bearing. A novel corresponding counterweight system provides selectable balance and torque requirements.