| 摘要 |
A manual controller for producing an output signal for control of hydraulic valves and the like. The controller has a quadrant lever consisting of an inner tube connected to a shaft and an outer tube slidable thereover. The inner tube has a palm rest at its upper end while the outer tube has an annular finger grip. The inner tube carries a slidable plug which is downwardly spring pressed and which is coupled to the outer tube to urge the finger grip downwardly away from the palm rest. A cam track is arranged on the frame closely parallel to the plane of swinging movement of the lever. The cam track is engaged by a cam follower which is secured to the outer tube. The cam track is so contoured that in the arc of movement of the lever from its reference position the cam follower thereon is yieldingly obstructed by the cam track so that progressive free movement of the lever must be accompanied by progressive squeezing movement of the hand of the operator with the result that the squeezing movement controls the progress of rocking movement. A drum is secured to the shaft and a pair of magnetically saturable tubes are arranged parallel to, and slightly spaced from, the drum. Extensive permanent magnets on the drum cooperate with the respective tubes, each of the magnets being so formed as to have a helically orientated edge, the magnets being arranged in a projected mirror image relation so that rocking of the drum by the lever results in progressive differential saturation of the tubes in a sense which depends upon the direction of lever movement thereby to produce an output signal which depends upon the direction and amount of lever movement.
|
