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Apparatus for locking and unlocking a flap door, especially in an aircraft

  • US 5,180,199 A
  • Filed: 01/24/1992
  • Issued: 01/19/1993
  • Est. Priority Date: 01/26/1991
  • Status: Expired due to Term
First Claim
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1. A locking mechanism for locking and unlocking a flap door, for example, in a floor separating two decks in a commercial aircraft, comprising a flap door tiltable into a passenger space, a bearing block secured to said flap door, comprising two sets of locking means arranged mirror-symmetrically relative to a central plane passing vertically through the flap door when the flap door is closed, said locking means being arranged near opposite edges of said flap door, said locking mechanism further comprising journal means for journalling said sets of locking means, each set of locking means comprising a bell crank lever journalled to said bearing block, said bell crank lever having a first means for operating said bell crank lever and a second means forming a lever arm for operating as a locking and unlocking element, a locking roller journalled to a free end of said lever arm, a locking claw secured to said floor for engagement with said locking roller, biasing means for biasing said locking claw into a locking position, and guide means for said locking roller arranged so that said locking roller can roll along said guide means after disengagement of the locking roller from the locking claw, whereby said mechanism can be unlocked before tilting said flap door.

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