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Flexible plastic foam with a groove- and tongue-like closing system

  • US 4,576,846 A
  • Filed: 09/06/1984
  • Issued: 03/18/1986
  • Est. Priority Date: 09/06/1983
  • Status: Expired due to Fees
First Claim
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1. A cellular plastic insulating member of a flexible plastic foam material for thermally insulating a conduit, such as a pipe, duct or the like,said member having a closing line extending longitudinally along the conduit, along which line the facing longitudinal surfaces of the insulating member are joined together,a closing system located along said closing line and comprising a groove and a tongue, said groove comprising a longitudinally extending groove formed into the material of the member along at least one side of said line, the opening of the groove, viewed in a transverse cross section, being smaller than the dimension across certain interior portions of the groove, also viewed in transverse cross section,said tongue of the closing system operatively connected to the side of the closing line other than the side having the groove, the tongue having a portion, viewed in transverse cross section, which is larger than said opening of the groove, and said tongue being undercut, of smaller dimension closer to the side of the insulating member to which it is operatively connected, such that the tongue and groove snap fit into engagement with each other,and said tongue being stiffer than the material forming the groove.

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