US Patent 8668217 Automated retractable step apparatus utilizing over-center locking mechanism

An automatically deployable step apparatus particularly usable with vehicle such as a fire truck having a passenger compartment at substantial distance from the surrounding environmental surface which provides powered movement between a deployed position and a retracted position and can be mounted in a relatively small restricted area in order to avoid interference with a truck cab which tilted to provide engine access, said apparatus utilizing a unique over-center locking mechanism to provide secure locking of the step in the deployed position while maintaining an apparatus having limited overall dimensions. A unique linkage system is provided for facilitating accurately powered automated movement.