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Axial fan

  • US 4,934,904 A
  • Filed: 01/31/1989
  • Issued: 06/19/1990
  • Est. Priority Date: 01/31/1989
  • Status: Expired due to Term
First Claim
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1. In an axial fan of the type wherein individual blade assemblies are clamped within apertures in a fan hub by fasteners extending between a retaining member and a blade base, each blade base including a shoulder overlying a bearing surface on the hub with resilient means positioned between the blade base shoulder and hub bearing surface, and having spacer means for maintaining the blade base shoulder and retaining member a preselected distance apart to allow prestressing of the fasteners while limiting the compressive forces applied to the resilient means, the improvement wherein the blade base shoulders and hub bearing surfaces are configured to cooperate with the resilient means to impart a centering force on a blade base relative to a hub aperture when a resilient means is compressed between a blade shoulder and hub bearing surface.

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