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Gate operator apparatus

  • US 4,503,723 A
  • Filed: 01/31/1983
  • Issued: 03/12/1985
  • Est. Priority Date: 01/31/1983
  • Status: Expired due to Fees
First Claim
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1. A dual four bar mechanism for translating a first torque to a second torque wherein the second torque is a non-linear function of the first torque, the mechanism comprising in combination:

  • input means for actuation by the first torque;

    a dual input member, said dual input member being connected to and adapted for rotation by said input means;

    a first linkage element having a pivot and a slot along an axis of said first linkage element, said pivot and slot of said first linkage element being positioned at a first predetermined distance each from the other;

    a second linkage element having a pivot and a slot along an axis of said second linkage element, said pivot and slot of said second linkage element being positioned at a second predetermined distance each from the other;

    output means adapted for providing a torque to a rotary output device, one of said pivot and said slot of said first linkage element being engaged with a first pivot point of said output means, one of said pivot and said slot of said second linkage element being engaged with a second pivot point of said output means, the other of said pivot and said slot of said first linkage element being engaged with a first driving point on said dual input member and the other of said pivot and said slot of said second linkage element being engaged with a second driving point on said dual input member, said pivots of said linkages being pivotably engaged with their respective pivot points on one of said input member and said output means and said slots being both pivotably and slidingly engaged with their respective pivot points on the other of said input member and said output means.

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