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Reversible stepping actuator

  • US 4,403,523 A
  • Filed: 06/23/1981
  • Issued: 09/13/1983
  • Est. Priority Date: 06/23/1981
  • Status: Expired due to Term
First Claim
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1. A reversible stepping actuator for producing a reversible incremental output rotation in response to a pulse input comprising:

  • a drive gear;

    a first ratchet wheel connected to the gear for driving the gear in a first sense of rotation;

    a second ratchet wheel connected to the gear for driving the gear in a second sense of rotation opposite to the first sense of rotation;

    a first drive pawl for engaging the first ratchet wheel and driving the first wheel in the first sense;

    a second drive pawl for engaging the second ratchet wheel and driving the second wheel in the second sense;

    a first locking pawl for engaging the first ratchet wheel and preventing rotation of the first wheel in the second sense;

    a second locking pawl for engaging the second ratchet wheel and preventing rotation of the second wheel in the first sense;

    means for maintaining both locking pawls in engagement with their respective ratchet wheels and both drive pawls out of engagement with their respective ratchet wheels when in a neutral position;

    first actuator means for disengaging the second locking pawl from the second ratchet wheel and at about the same time engaging the first drive pawl with the first ratchet wheel; and

    second actuator means for disengaging the first locking pawl from the first ratchet wheel and at about the same time engaging the second drive pawl with the second ratchet wheel.

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