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Material handling system

  • US 5,348,063 A
  • Filed: 10/29/1993
  • Issued: 09/20/1994
  • Est. Priority Date: 01/04/1993
  • Status: Expired due to Fees
First Claim
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1. A material handling system for effecting the transfer of powdered or granular fluent material with respect to a container while preventing the escape of such material to a surrounding work environment, said system comprisinga container defining a volume for containing a load of said material and having an opening in the top of the container in communication with said volume,a lower closure device secured to the container at the top thereof, said closure device being movable between a closed position closing said opening and an open position for permitting access to said volume via said container opening,an upper closure device on the container above the lower closure device, at least part of said upper closure device being adapted for removal from the container to permit access to the container opening when said lower closure device is in its open position,a tubular head comprising an outer sleeve, and inner tube means inside the outer sleeve and generally coaxial therewith,the container being adapted to be sealingly connected to said tubular head with the outer sleeve in sealing engagement with respect to the container when at least part of said upper closure device is removed from the container,actuator means for moving said inner tube means axially relative to the outer sleeve between a raised position and a lowered position in which said inner tube means extends endwise down beyond the outer sleeve,said actuator means being operable to move said inner tube means from its raised position to its lowered position after said container has been connected to said tubular head with the outer sleeve in sealing engagement with respect to the container and with at least part of said upper closure device removed from the container, and after said lower closure device has been opened to permit passage of said inner tube means down through said container opening, andsaid actuator means being further operable to move said inner tube means back to its raised position whereby said lower closure device may be closed prior to disconnection of the container from the tubular head.

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