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Device for the metered delivery of a viscous liquid

  • US 6,935,539 B2
  • Filed: 11/26/2003
  • Issued: 08/30/2005
  • Est. Priority Date: 06/28/2001
  • Status: Expired due to Fees
First Claim
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1. A device for the metered delivery of a viscous liquid, comprising:

  • a first and second piston consisting of a selected one of hard metal or tool steel, a pump body comprising a first sleeve consisting of a selected one of hard metal or ceramic and having a first drill hole accommodating the pistons as well as two further drill holes which run orthogonally to the first drill hole and one end of which opens out into the first drill hole and the other end of which opens out into an intake chamber or a discharge chamber in the pump body, wherein the first drill hole and the first and second piston each form a slot seal and wherein the pistons each stick out at a respective end of the first drill hole, and a drive mechanism for moving the pistons back and forth such that a width of a slit formed between the pistons varies during the back and forth movement.

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