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Sealing arrangements

  • US 4,813,184 A
  • Filed: 11/23/1987
  • Issued: 03/21/1989
  • Est. Priority Date: 11/25/1986
  • Status: Expired due to Term
First Claim
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1. A sealing arrangement for sealing around a closable opening, comprisinga sealing part made of flexible material defining a longitudinal hollow interior and having a normal, sealing, configuration,means connecting to the hollow interior to enable the pressure therewithin to be decreased below atmospheric pressure so as partially to evacuate the sealing part and to cause the sealing part to assume a relatively collapsed non-sealing configuration, and to enable the pressure therewithin to be increased to cause the sealing part to re-assume the said sealing configuration,the interior wall of the sealing part defining the hollow interior being formed with one or more longitudinal grooves, so positioned that the collapsed configuration is of predetermined form, andan air-impervious lining on and extending over the whole of the interior wall of the sealing part including the said one or more grooves.

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