• US 3,674,316 A
  • Filed: 05/14/1970
  • Issued: 07/04/1972
  • Est. Priority Date: 05/14/1970
  • Status: Expired due to Term
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First Claim
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1. An apparatus for sensing particles in a flowing fluid comprising:

  • first means having a first passage for carrying fluid, second means having a second passage for carrying fluid, said second passage located offset from the first passage and having a portion thereof in substantial Parallel alignment with the first passage, connecting means joining the first means with the second means, said connecting means comprising a housing having an inside wall surrounding a large chamber open to the first passage and an outlet opening to the second passage whereby fluid and particles flow through said chamber, said housing having an inlet opening in communication with the first passage and an open end, said open end being substantially larger than the inlet opening, said chamber increasing in cross section as a function of distance away from the inlet opening toward the open end, particle sensing means mounted on said housing and located across the open end of said housing opposite the inlet opening adjacent the outlet opening and inclined with respect to the longitudinal axis of the first passage, said sensing means comprising flexible sheet means located across the open end of the housing, said sheet means having an outer peripheral portion and a portion extendible in a concave shape into the chamber to provide a barrier for particles moving with the fluid flowing through said chamber whereby when said particles strike said sheet means a readable sound signal related to the flow of particles through the chamber is established, and means mounting only said outer peripheral portion of the sheet means to said housing.

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