Retractable vehicle ramp with lift assist
Patent 5340267 Issued on August 23, 1994. Estimated Expiration Date: 
December 17, 2011. 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.
December 17, 2011. 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 2228946 3233767 3511393 3730361 3743121 3901398 3913763 Ramp and ramp carrier for trucks and the like Ramp and ramp carrier for trucks and the like Van platform with lockable ramp InventorsAssigneeApplicationNo. 809734 filed on 12/17/1991US Classes:414/537, Skidway14/71.1AttachedExaminersPrimary: Bucci, David A.Attorney, Agent or FirmForeign Patent References
International ClassB60P 001/43AbstractA retractable ramp mechanism for a vehicle includes a frame mounted to the vehicle and a ramp mounted to the frame by way of a linkage for movements between stowed and extended positions. The linkage is constructed and arranged to permit an inner end of the ramp to pivot upwardly with respect to the frame from a lower position to an engagement position. In the engagement position, the inner end of the ramp may be engaged with a work surface of the vehicle. The linkage includes a mechanism for applying a biasing force to bias the inner end of the ramp upwardly to the engagement position when the ramp is in the extended position.Other References
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