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Gate operator and method using automatic limit adjustment

  • US 5,729,101 A
  • Filed: 03/11/1994
  • Issued: 03/17/1998
  • Est. Priority Date: 03/11/1994
  • Status: Expired due to Term
First Claim
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1. A gate operator for moving a gate between two fixed end positions and one of which may constitute a gate opened end position and the other of which may constitute a gate closed end position and automatically compensating for external conditions which affect gate movement to minimize contact with a fixed structure at the end positions, said apparatus comprising:

  • a) means for driving a gate under power and measuring counts representative of a distance between a first fixed end position to a second and opposite fixed end position continuously during the gate movement and commencing with the starting movement of the gate; and

    b) control means for measuring a count representative of a movement distance on the next movement of the gate from the first fixed end position to the second fixed end position and automatically adding a control count to increase the driving movement and hence driving distance for still subsequent powered movements of the gate from the first fixed end position to the second fixed end position if the gate stopped short of the second fixed end position, said control means further measuring the counts representative of distance of movement for still subsequent movements from the first fixed end position to the second fixed end position and adding still additional control counts to increase driving movement and hence driving distance if the gate still stopped short of the second fixed end position said control means automatically subtracting counts to reduce driving movement and hence driving distance for each subsequent powered movement to the second fixed end position of the gate if the gate still contacted a fixed structure at the second end position, said control means also subtracting still additional counts to reduce driving movement and hence driving distance for still subsequent movements from the first fixed end position to the second fixed end position if the gate still contacted a fixed structure at the second fixed end position.

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