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Transport system with blocking valve control

  • US 4,240,768 A
  • Filed: 04/07/1977
  • Issued: 12/23/1980
  • Est. Priority Date: 04/07/1977
  • Status: Expired due to Term
First Claim
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1. In a transport system including a continuous conduit for conveying wheeled vehicles therein, at least one wheeled vehicle within said conduit, and pump means for discharging pressurized air into said conduit, the combination of:

  • a first overhead-suspended swingable valve adapted to move between a closed position blocking off said conduit and an open position permitting a vehicle to sweep past,a second overhead-suspended swingable valve downstream of the first valve adapted to move between a closed position blocking off said conduit and an open position permitting a vehicle to sweep past, said first and second valves being spaced from each other,vent means connected to the conduit between said first and second valves,opening means urging said first and second valves to the open position,air flow control means associated with said pump means and positioned for alternately directing air into the upper portion of the conduit and against the back of the first valve to close said first valve behind a vehicle while allowing said second valve to open under the action of said opening means ahead of said vehicle and directing air into the upper portion of the conduit and against the back of the second valve to close said second valve behind said vehicle while allowing said first valve to open under the action of said opening means, andmeans responsive to the position of said vehicle for actuating said air flow control means.

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