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Safety lockout for actuator shaft

  • US 6,439,446 B1
  • Filed: 12/01/2000
  • Issued: 08/27/2002
  • Est. Priority Date: 12/01/2000
  • Status: Expired due to Term
First Claim
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1. A safety lock-out to prevent rotation of a rotary actuator when an axial distance between a first and a second portion of an actuated mechanism exceeds a selected distance, comprising:

  • a shaft rotatably connected to the first portion, axially movable relative to the second portion, said shaft defining a notch;

    a locking member adapted to lock the rotary actuator, said locking member being movable between a locking position and an unlocked position, wherein the locking member fits in the notch when in the locking position thus preventing rotation of the shaft;

    a spring member urging the locking member in the locking position; and

    an unlocking member adapted to urge the locking member in the unlocked position when the selected distance is not exceeded.

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