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Mechanism for screw drive and syringe plunger engagement/disengagement

  • US 4,424,720 A
  • Filed: 12/15/1980
  • Issued: 01/10/1984
  • Est. Priority Date: 12/15/1980
  • Status: Expired due to Term
First Claim
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1. The combination comprising:

  • a lead screw;

    traveler means actuable between states of threaded engagement and disengagement with said lead screw, said traveler means including biasing means for biasing said traveler means in said state of engagement and in said state of disengagement, said biasing means producing an over-center action during movement of said traveler means between said state of engagement and said state of disengagement;

    actuating means, selectively operable, for actuating said traveler means; and

    means for coupling said actuating means to said traveler means to allow limited relative movement between said actuating means and said traveler means, such that said traveler means moves to said state of engagement independently of said actuating means after said biasing means has moved over center, and further such that said traveler means begins to engage said lead screw in moving to said state of engagement only after said biasing means has moved over center.

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