Venting seal for dispenser

  • US 6,899,254 B1
  • Filed: 01/20/2004
  • Issued: 05/31/2005
  • Est. Priority Date: 01/20/2004
  • Status: Active Grant
First Claim
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1. A dispenser comprising:

  • (a) a container providing a cavity having an inner wall and a discharge opening at one end;

    (b) a piston in said cavity and having a peripheral wall portion sealing against the inner wall of the container defining said cavity, said piston having a front wall, a rear wall and a centrally disposed passage therethrough;

    (c) a sealing plug of resiliently deformable material seated in said passage with a front end and rear end and having a peripheral flange about said front end thereof adjacent the discharge opening, said flange bearing upon a surface of said front wall of said piston about said passage to effect a seal therebetween; and

    (d) a filler push rod extending into said container cavity and having one end bearing upon a surface of said sealing plug spaced from said discharge opening, said push rod being movable against said rear end of said plug to move said flange of said plug away from said surface of said piston to allow air to vent through said passage around the periphery of said plug.

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