Piston-to-cylinder seal for a pneumatic engine

  • US 6,085,631 A
  • Filed: 07/29/1999
  • Issued: 07/11/2000
  • Est. Priority Date: 10/26/1998
  • Status: Expired due to Term
First Claim
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1. A compression seal system for a pneumatic engine, the seal system comprising:

  • (i) a piston cylinder having an inner wall with an innermost diameter;

    (ii) a piston positioned within said cylinder and having an outer diameter which is less than said innermost diameter of said cylinder, said piston extending across said innermost diameter of said cylinder so that only air is permitted between said inner wall of said cylinder and said outer diameter of said piston as said piston travels within said inner wall of said cylinder;

    (iii) a seal including(a) a cylindrical sleeve having an inside diameter conformal with an outside diameter of a compression surface of said piston, said cylindrical sleeve having a radial base thereof complemental to said compression surface of said piston; and

    (b) a resilient annual skirt integrally dependent from said sleeve; and

    (iv) a pulsating pneumatic input to said cylinder,whereby, responsive to cyclically elevated air pressure against said skirt, said skirt forms an air seal with said inner wall of said piston cylinder of said pneumatic engine to move said piston, and said innermost diameter of said piston cylinder being a substantially uniform innermost diameter along the length of said piston cylinder that touches said seal during movement of said seal.

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