Importance

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Abstract

A cable control system is constructed to isolate a controlled member from uncontrolled motion upon sudden breakage or disconnection of cables in the system. The control system has an input mechanism connected to the controlled member by a control circuit which includes an input pulley and an output pulley system. The output pulley system has first and second quadrants which are rotatable about a common axis of rotation. The quadrants have a pivot connection to permit relative pivoting motion between the quadrants. A spring connected between the quadrants urges them to rotate toward each other. The cables are connected to respective quadrants and to the input mechanism to cause conjoint rotation of the quadrants about the common axis in response to corresponding rotation of the input pulley. Tension in the cables holds the spring in an extended position. An output lever is pivotally mounted for free pivoting motion relative to the quadrants. A linkage interconnects the quadrants and the output lever in a control circuit operating position. However, should one of the cables break or become disconnected, the linkage is moved by operation of the spring to a control circuit isolating position in which the linkage is not able to transmit movement of the quadrants to the output lever whereby the controlled member is isolated from the effects of the breakage or disconnection.

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First Claim