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Door mechanism that permits easy opening and holds door open

  • US 10,697,222 B2
  • Filed: 11/11/2017
  • Issued: 06/30/2020
  • Est. Priority Date: 11/11/2017
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • a first shaft coupled to a door for rotating the door;

    a first armature on the first shaft;

    a second shaft with a module that resists motion;

    a second armature on the second shaft;

    wherein the first and second armatures rotate in opposite directions;

    a linkage that connects the first armature at a first connection point spaced from the first shaft with the second armature at a second connection point spaced from the second shaft;

    a freewheel connecting the second armature and the second shaft such that the module that resists motion is not engaged in an opening direction, thereby allowing the opening of the door without resistance;

    the freewheel engaging the module that resists motion as the door is closed to provide resistance as the door is closed; and

    the linkage positioned such that as the door is nearly closed, the first shaft, the second shaft, and the first connection point are aligned, such that the module that resists motion is no longer engaged and the resistance becomes negligible allowing the door to close fully.

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