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High vacuum seal

  • US 4,244,557 A
  • Filed: 10/03/1978
  • Issued: 01/13/1981
  • Est. Priority Date: 10/07/1977
  • Status: Expired due to Term
First Claim
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1. In a vacuum-tight closure assembly including means defining a valve seat;

  • a spreadable valve plate movable into a closed position for assuming a spreaded state in which it sealingly engages the valve seat; and

    guide means for a centered guiding of the valve plate during its motion into the closed position;

    the improvement wherein said guide means comprises(a) a plurality of lugs affixed to said means defining said valve seat;

    each said lug having a guide face being situated in the vicinity of said valve seat; and

    (b) a carrier affixed to and movable with said valve plate and having a periphery comprising counterguide faces;

    said guide faces of said lugs being oriented towards said counterguide faces of said carrier;

    said guide face cooperating with said counterguide faces during said motion of said valve plate.

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