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Automatic door opening and closing device

  • US 4,530,185 A
  • Filed: 10/27/1982
  • Issued: 07/23/1985
  • Est. Priority Date: 10/29/1981
  • Status: Expired due to Term
First Claim
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1. An automatic door opening and closing device for a door on a automobile body, said door being connected to said body at one door edge by at least one hinge and at the other door edge said door is locked to said body by engagement of a striker on said body with a latch of a door lock on said door, comprising:

  • means for opening and closing said door by applying respectively forces of opposite direction between said body and said one door edge, said forces acting outside the pivot shaft of said at least one door hinge and causing said door to pivot relative to said body;

    auxiliary means for door closure, said auxiliary means operating said latch of said door lock to fully engage said lock latch with said striker;

    means for determining the position of said latch relative to said striker, said means for determining indicating substantially the first contact, between said latch and said striker at a half latch position during closing of said door from an open position;

    drive means for selectively driving either said means for door opening and closing or said auxiliary means for door closing, said drive means being adapted to operate during door closing to drive said mans for door opening and closing while said striker and latch are disengaged in response to said disengaged condition being indicated by said means for determining, and said drive means driving said auxiliary means for door closing to operate said latch when contact between said latch and striker is detected by said means for determining at said half-latch position, operation of said auxiliary means being adapted to continue to close said door until a full-latch position wherein said latch fully engages said striker;

    a push rod, said forces of opposite direction being applied by pulling and pushing said rod, said push rod at one end being pivotably connected to said automobile body, the other end of said push rod being driven through said drive means, said drive means being connected to said door;

    said door opening and closing means is comprised of a speed reduction unit incorporating an electromagnetic clutch therein and connected to said drive means, a sector gear connected to said speed reduction unit and pivoted at its central part to said door, and a rotatable arm pivoted to said door at its one end, said rotatable arm being connected to said sector gear at a middle part of said rotatable arm and being pivoted to one end of said push rod at its other end, said one end of the push rod being subject to moving substantially along the axial line thereof in response to the rotation of said sector gear.

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