Escalator system with a drop-down step
Patent 4569433 Issued on February 11, 1986. Estimated Expiration Date: 
August 27, 2004. 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.
August 27, 2004. 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 ReferencesCooperative escalator and wheel chair Patent #: 4326622 InventorsApplicationNo. 06/644279 filed on 08/27/1984US Classes:198/333, With specified step structure198/326By stairway having steps forming an endless memberExaminersPrimary: Valenza, Joseph E.Assistant: Stone, Michael Attorney, Agent or FirmInternational ClassesB66B 23/12 (20060101)B66B 31/00 (20060101) B66B 23/08 (20060101) Foreign Application Priority Data1983-08-30 JPAbstractAn escalator system comprises an endless loop of chain links extending between two landings, a plurality of steps pivotally connected to the chain link loop, a guide rail system for guiding the steps, and a drive means for driving the chain link along the chain link loop with the steps thereon. At least one of the escalator steps comprises a step main body pivotally connected to a chain link loop and guided by a guide rail system, and a drop-down portion pivotally mounted to the main body and movable between a horizontal position in which the main body and the drop-down portion together forms a usual step tread and a drop-down position in which the drop-down portion is dropped down for allowing a wheel chair to be carried on the steps. | |
