Patent ID: 7356990

Claim:
A electro-hydraulic actuator comprising: a hydraulic manifold; a hydraulic piston in fluid communication with the hydraulic manifold, the hydraulic piston having a piston housing; an accumulator housing having a top plate and a bottom plate; at least one nested spring having a first end seated on the bottom plate and a second end seated on a spring seat; a plurality of accumulators, each accumulator in fluid communication with the hydraulic manifold and the hydraulic piston, each accumulator connected to a top structure and a bottom structure, the piston housing and the hydraulic manifold connected to the top structure, wherein the plurality of accumulators is sized such that at least one of the plurality of accumulators can fail to work properly when required and the remaining plurality of accumulators will stroke the hydraulic piston to a fail-safe condition; and an accumulator piston assembly attached to the spring seat, the accumulator piston assembly in fluid communication with the hydraulic manifold, wherein the bottom structure comprises a plurality of modular structures and wherein the bottom plate is attached to one of the plurality of modular structures.