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156 
THE CONTROL OF POWERED STEERING
Page 114
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ONE of the aims of a power-steering control mechanism shown in patent No. 860,427 is to give the driver " feel." Other advantages are that there is no lost motion and also, a more positive and accurate response. (The Bendix Company, South Bend, Indiana, U.S.A.) The portion of the mechanism shown in the drawing is that which converts the rotary motion of the steering column into lateral movement to actuate a valve spool at the end of the steering column casing. End (1) is attached to the steering shaft whilst the other end (2) is fixed to the steering worm. The turning moment is converted by means of spring struts (3) which lie between the end flanges and a central washer (4). The washer is joined to a rod which, goes through the centre of the worm, and is connected to the valve spool.
In operation, when the left-hand flange is turned against the resistance of the worm, the effect is to tilt one set of struts to a lesser angle and the other to a greater. The net result is to impart lateral movement to the central ring, and through it the valve, which in turn controls the application of the power assistance to the steering.
The power thrust is created by a separate cylinder located between the frame and the steering tie rod. The scheme is an improvement on an earlier patent numbered 842,069.
a40