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Method of making a shaft seal with dual lip

  • US 4,038,359 A
  • Filed: 01/27/1975
  • Issued: 07/26/1977
  • Est. Priority Date: 01/27/1975
  • Status: Expired due to Term
First Claim
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1. A method for making a shaft seal of the type including a single annular metal case having a radial flange and a cylindrical portion, and an annular polytetrafluoroethylene sealing element including a radial portion and a sealing lip, said method comprising the steps of:

  • a. connecting said sealing element to said case by placing said radial portion of said sealing element against the inside surface of said radial flange of said case and molding an annular synthetic rubber filler ring in the annular space between said radial portion of said sealing element and said cylindrical portion of said metal case, said filler ring being a solid body substantially filling said annular space and being spaced away from and out of contact with said sealing lip, and bonding said filler ring to both said radial portion of said sealing element and to said cylindrical portion of said case; and

    b. molding an auxiliary lip from said synthetic rubber simultaneously with said filler ring molding step, said auxiliary lip being located on the opposite side of said radial flange from said sealing lip.

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