Electric actuators
AssigneeWestinghouse Brake & Signal Co. Ltd.
InventorsDavid J. Wickham, Jack Washbourn, Howard F. Cogan
Life of this patent
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Abstract
An electric actuator having an electric motor operable to determine the output force generated on an output member by a spring system, and an adjustable stop by which can be limited the maximum value of the output force, the position of the adjustable stop being variable in accordance with variation of the required maximum value of the output force to be exerted by the output member.
Claims14
An electric actuator comprising an output member movable to a force exerting position in which said output member exerts a variable output force, spring means for exerting a variable force on said output member to control the variable output force exerted by said output member, an electric motor for determining the output force exerted on said output member by said spring means, a stop means for limiting the maximum value of the output force exerted by said spring means, and adjustment means for varying the position of the stop means in accordance with the maximum value of the output force required to be exerted by the output member.
Dependencies are inferred from the claim text.