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Door check

  • US 4,912,806 A
  • Filed: 02/19/1988
  • Issued: 04/03/1990
  • Est. Priority Date: 02/20/1987
  • Status: Expired due to Fees
First Claim
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1. A door check comprising:

  • input gear means for being rotated when a door rotates;

    spring means for storing spring energy in accordance with rotation of said input gear means in a door opening direction;

    means for transmitting to said input gear means release of the spring energy stored in said spring means;

    means for braking the release of the spring energy;

    a speed increasing gear train for the released spring energy to said braking means; and

    worm gear means having a worm mounted on a worm shaft provided at a final output stage of said speed increasing gear train;

    said means for braking comprising;

    deformable friction plates having arm portions integrally formed therewith, said plates being supported by said worm shaft; and

    a braking cup disposed at an end of said worm shaft so that said braking cup surrounds said plates;

    said arm portions being elastically deformed when said worm shaft rotates at high speed so that said arm portions contact said braking cup causing braking of rotations of said worm shaft.

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