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Self-closing fire door

DC
  • US 5,542,460 A
  • Filed: 08/30/1994
  • Issued: 08/06/1996
  • Est. Priority Date: 12/17/1992
  • Status: Expired due to Term
First Claim
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1. A door comprising:

  • an accordion-like member comprising two confrontingly disposed articulated walls formed of a flexible reticulated material;

    a guide positioned on at least one side of said accordion-like member for guiding said accordion-like member for movement between a first or opened position and a second or closed position;

    regulating means for regulating the speed of movement of said accordion-like member comprising a speed reduction means for reducing a rotational speed, an input shaft connected to said speed reduction means, an output shaft connected to said speed reduction means, said speed reduction means for reducing the rotational speed of said output shaft relative to said input shaft, wherein said regulating means is operable in a first direction toward the closed position and a second direction toward the opened position;

    a self-closing mechanism operatively connected to said output shaft and said accordion-like member for moving said accordion-like member to its closed position, said self-closing mechanism incorporating movable means for storing energy as said accordion-like member is moved to its opened position, the stored energy acting through said movable means for urging said accordion-like member to its closed position;

    a brake for preventing rotation of said output shaft thereby blocking movement of said self-closing mechanism; and

    releasing means for releasing said brake to free said output shaft for rotation thereby freeing said movable means for releasing the stored energy for urging the door to its closed position.

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