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JOINT FOR DEVICE FOR METERING LIQUIDS

  • US 20110027149A1
  • Filed: 04/07/2009
  • Published: 02/03/2011
  • Est. Priority Date: 04/08/2008
  • Status: Active Grant
First Claim
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1. A device for manually metering liquids comprising a cylinder and a piston housed inside the cylinder, with the device being arranged so as, during the metering operation, the piston moves along its axis to suck in or to expel the liquid, the device further comprising a joint housed in the cylinder and arranged so as to provide the sealing between the cylinder and the piston, wherein during the metering operation, the joint remains fixed with respect to the movement of the piston, wherein the joint comprises a first part which cooperates with the internal wall of the cylinder and which fulfils the functions of sealing the joint directly against the internal surface of the cylinder and fastening of the joint in the cylinder, and a second part which is in contact with the piston which fulfils the functions of sealing the joint against the piston and sliding between the joint and the piston, and wherein the thickness of the second part of the joint, measured at a contact point with the piston in a direction perpendicular to the piston axis from said point of contact and/or the thickness of a connection zone between the first part and the second part is chosen so that the friction force imparted by the joint pressing against the piston surface upon the movement of the piston with respect to the joint is smaller that 5 N for pipetted volume smaller than 100 ml.

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