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Ejection apparatus for the high pressure ejection of a liquid

  • US 5,840,061 A
  • Filed: 01/15/1997
  • Issued: 11/24/1998
  • Est. Priority Date: 05/15/1995
  • Status: Expired due to Term
First Claim
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1. Ejection apparatus for the high pressure ejection of a liquid, comprising:

  • (a) a pressure chamber for containing the liquid;

    (b) an ejection opening communicating between an outside and an inside of the pressure chamber;

    (c) a working piston displaceable in the pressure chamber from a first position at a beginning of a working stroke to second position at an end of the working stroke, having (1) a first end defining a first volume within the pressure chamber when the working piston is at the first position and displacing a second volume when the working piston moves from the first position to the second position, the first volume being substantially larger than the second volume, and (2) having a second end distal from the first end; and

    (d) a drive for driving the working piston including (1) an impact member for elastically impacting the second end of the working piston to cause the working piston to move from the first to the second position, and (2) means for accelerating the impact member to impact the working piston, wherein the impact member is not driven after an elastic impact with the working piston.

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