Power-locking motor-vehicle door latch

  • US 5,634,677 A
  • Filed: 07/17/1995
  • Issued: 06/03/1997
  • Est. Priority Date: 09/01/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. A motor-vehicle door latch comprising:

  • a housing;

    a lock fork on the housing engageable with a door bolt and pivotable between a holding position engaged around the bolt and retaining it on the housing and a freeing position permitting the door bolt to move into and out of the housing;

    a release pawl engageable with the fork and displaceable between a latched position retaining the fork in the holding position and an unlatched position unengageable with the fork and permitting the fork to move into the freeing position;

    means including a manual actuating mechanism movable between an actuated position and an unactuated position;

    means including a coupling part displaceable on the housing between a coupling position connecting the actuating mechanism to the release pawl for displacement of the release pawl into the unlatched position on displacement of the actuating mechanism into the actuated position and a decoupling position for disconnecting the actuating mechanism from the release pawl, whereby in the decoupling position actuation of the actuating mechanism does not affect the release pawl;

    a central locking elementdisplaceable on the housing generally parallel to a predetermined direction between locked and unlocked positions,formed with a cutout opening transversely of the direction and having locking and unlocking flanks directed oppositely at least generally in the direction, andformed to each side of the cutout with an abutment surface directed generally perpendicular to the direction;

    means including a locking mechanism jointly movable with the locking element and connected between the central locking element and the coupling part for displacing the coupling part into the decoupling position on displacement of the central locking element into the locked position and for displacing the coupling part into the coupling position on displacement of the central locking element into the unlocked position;

    a drive body rotatable about a drive axis and having an eccentric pin formation defining on rotation of the drive body an orbit lying partially inside and partially outside the cutout; and

    means including a reversible electric motor for rotating the drive body and thereby orbiting the pin formation about the drive axisin one rotational sense for engaging the pin formation against the locking flank and displacing the central locking element into the locked position and thereafter engaging the pin formation against one of the abutment surfaces and thereby stopping the drive element andin the opposite rotational sense for engaging the pin formation against the unlocking flank and displacing the central locking element into the unlocked position and thereafter engaging the pin formation against the other of the abutment surfaces and thereby stopping the drive element.

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