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Pneumatic distribution system with split ducts

  • US 4,826,088 A
  • Filed: 11/23/1987
  • Issued: 05/02/1989
  • Est. Priority Date: 11/23/1987
  • Status: Expired due to Term
First Claim
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1. A pneumatic distribution system for a particulate material comprising a tank for containing the material, a plurality of distribution ducts, metering means for feeding the material from the tank into each of the ducts at a metered rate, air blower means for pneumatically transporting the metered material along the ducts, means mounting the ducts such that a first set of the ducts extends from the tank outwardly to one side thereof and a second set of the ducts extends outwardly to an opposed side thereof, each set of ducts being arranged such that the extent of the ducts from the tank is staggered from a shortest one of the set to a longest one of the set, each duct including a straight continuous elongate pipe having a tubular peripheral wall and extending from an end of the pipe adjacent the tank to an end of the pipe forming the end of the duct spaced outwardly of the tank, a plurality of spreader nozzles, each nozzle being separate from and attached to said outward end of a respective one of the pipes, each spreader nozzle including deflector surfaces for directly receiving the material from the pipe and for deflecting the material from the pipe in a spread pattern, each pipe having an opening formed in the peripheral wall thereof at a position spaced from said outward end thereof and a extractor nozzle mounted at the opening and defining guide surface means having a straight substantially vertical leading edge within the pipe transverse to the pipe and dividing the pipe into two parts and being inclined across said pipe from said leading edge to one side of said pipe exteriorly of said opening such that material in one of said two parts of the pipe is deflected out of the pipe at the opening and material in the other of the two parts of the pipe continues along the pipe to said outward end thereof, and spreader means arranged to receive said material from said guide surface means for forming the deflected material into a spread pattern, the extractor nozzle of each pipe being positioned between the spreader nozzle of that pipe and the spreader nozzle of the next adjacent shorter pipe.

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