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Dosing device for the controlled delivery of a liquid

  • US 5,318,521 A
  • Filed: 04/30/1993
  • Issued: 06/07/1994
  • Est. Priority Date: 05/12/1992
  • Status: Expired due to Fees
First Claim
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1. A dosing device for use with a liquid-containing reservoir, for controlled delivery of liquid from said reservoir to a delivery site, said dosing device comprising:

  • a piston pump having a piston in a cylinder housing having a detent, said piston being movable in a stroke between a quiescent position and a position in contact with said detent;

    electromagnetic actuation means for causing said piston to move toward said detent from said quiescent position;

    ,detector means for generating a signal upon impact of said piston with said detent;

    control means for supplying a turn-on signal and a turn-off signal to said electromagnetic actuation means; and

    evaluation means, connected to said control means and supplied with said signal from said detector means, for setting the .length of an on-time duration following a turn-on signal and for instructing said control means to generate said turn-off signal after the expiration of said on-time duration by setting said on-time duration to a length shorter than the time required for said piston to move from said quiescent position to said detent given fault-free operation, and for lengthening said on-time duration in the absence of a signal from said detector means for a first predetermined number of strokes within a second predetermined number of strokes.

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