Retractable gate
Patent 7384017 Issued on June 10, 2008. Estimated Expiration Date: 
June 13, 2025. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 13, 2025. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 494390 1536360 1628651 Extensible railroad grade crossing gate arm Crossing gate counterweight adjustment 6189839 Railroad grade crossing assembly Patent #: 6618993 InventorsAssigneeApplicationNo. 11150702 filed on 06/13/2005US 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-WAYExaminersPrimary: Le, Mark T.Attorney, Agent or FirmInternational ClassB61L 23/00AbstractA 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. | |
