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Apparatus for displacing a piston in a chamber having a torque resistor

  • US 4,769,009 A
  • Filed: 10/10/1986
  • Issued: 09/06/1988
  • Est. Priority Date: 10/10/1986
  • Status: Expired due to Term
First Claim
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1. Apparatus for displacing a piston in a chamber comprisinga support member,a motor including a housing and a driving member that is mounted within said housing and rotates relative to said housing about a driving axis, said driving member being rotatably mounted with respect to said support member, said housing being mounted on said support member, for limited relative rotation therewith,a torque resistor means connected between said motor housing and said support member so as to limit relative rotation between the two except when the torque between the two exceeds a predetermined amount,a piston driver including a driven portion threadedly connected to said driving member and a displacement portion that is axially displaced in response to relative rotation between said driving member and said driven portion, anda housing rotation detector means to detect when said housing rotates relative to said support member, indicating resistance to axial movement of said piston driver.

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