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Filter element with zig-zag pleats

  • US 4,746,432 A
  • Filed: 12/08/1986
  • Issued: 05/24/1988
  • Est. Priority Date: 10/18/1983
  • Status: Expired due to Term
First Claim
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1. A filter element including a generally ring-like structure including a plurality of generally radial sections each converging generally radially inwardly and having a plurality of generally circumferential zigzag pleats of a filtering sheet material, said radial sections being circumferentially arranged such that the radially inner ends of said radial sections cooperate to define a central space disposed substantially centrally of said ring-like structure and generally radial spaces are defined between said radial sections, the zigzag pleats of each radial section having circumferential dimensions which are substantially gradually decreased radially inwardly of said ring-like structure, some of said radial spaces being radially inwardly open to said central space and being closed at the radially outer ends by said filtering sheet material, the other radial spaces being closed at the radially inner ends by said filtering sheet material, said radially inwardly open radial spaces and the other radial spaces being circumferentially alternately arranged, and said radially inwardly open radial spaces being closed at the axially opposite ends by end walls.

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