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Movable grating control

  • US 6,945,867 B2
  • Filed: 08/19/2003
  • Issued: 09/20/2005
  • Est. Priority Date: 08/19/2003
  • Status: Expired due to Fees
First Claim
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1. A stationary and movable grating, drive means moving said movable grating between OPEN and CLOSED positions relative to said stationary grating,said drive means connected to drive said movable grating toward CLOSED position through a yieldable connection, said drive means connected to directly drive said movable grating toward OPEN position, wherein said drive means is connected, before driving said movable grating toward OPEN position, to remove any slack in the system due to yielding in movement toward CLOSED position.

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