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Sized coated pistons

  • US 5,435,872 A
  • Filed: 11/12/1993
  • Issued: 07/25/1995
  • Est. Priority Date: 11/01/1991
  • Status: Expired due to Fees
First Claim
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1. A plurality of pistons adapted to be slidably movable within inner surfaces of a plurality of cylinders, each having substantially the same bore diameter, said pistons each having an outer curved surface area subjected to frictional contact with an inner surface of one of said cylinders, said area of each piston having a coat of dry-film lubricant, the improvement comprising:

  • at least some of said pistons before being coated having outer curved surface areas of different diameter sizes;

    said coatings of said dry-film lubricant on selected ones of said pistons having different selected, controlled, thicknesses selected to provide the same total outer diameter size for all of the pistons.

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