Safety lockout for engine clutch

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The Northwest Engineering Company patent solves the following problem:

Our analysis of this patent is as follows:

Northwest Engineering Company’s patent US 4109771 A deals with Safety lockout for engine clutch.
Pneumatic actuation of an over-center clutch in a first control valve and fluid motor in the direction to make the clutch that prevented one or more of the safety valve lockout control at every turn the pneumatic pressure fluid from the main control valve to actuate the fluid motor in the direction of clutch disengagement while connecting to the main control valve to drain. An operative fluid pressure used.

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