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Joy-stick controller

  • US 4,306,208 A
  • Filed: 01/10/1980
  • Issued: 12/15/1981
  • Est. Priority Date: 05/30/1978
  • Status: Expired due to Term
First Claim
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1. A joy-stick actuator, comprising:

  • a body,an actuator rod,means mounting said rod in said body for pivotal movement between a neutral position and a displaced position on either side of said neutral position,an actuator follower member in said body having means defining first and second sloping follower-actuating surfaces, angularly disposed to each other,means coupling said follower member for movement by said rod,a differential transformer including an input coil and a pair of axially aligned output coils positioned on opposite sides of said input coil and defining a common axial armature cavity,an armature in said cavity movable between a central neutral position and axially offset positions on either side of said neutral position to vary the inductive coupling between said primary and said secondary coils in accordance with the extent of displacement of said armature from said neutral position, andfirst follower plunger means coacting with said first follower actuating surface and connected to said armature to impart axial movement to said armature corresponding to the extent of pivotal movement of said rod from said neutral position said first plunger means having resilient means such that said first plunger means exerts a force on said actuator follower member at all positions of said actuator follower member; and

    second follower plunger means coacting with said second follower actuating surface and having second resilient means exerting a second force on said actuator follower member to counterbalance said force of said first actuator follower member to maintain said actuator rod at a predetermined position relative to said body.

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