Door stop mechanism
A door stop includes a scissor link member including a pair of links pivotably coupled together at a central pivot point. The scissor link member has a first end pivotally coupled to a door and a second end pivotally coupled to a floor. The pair of links are configured to abut against one another adjacent the central pivot point when the door is fully open to prevent pivoting at the central pivot point for holding the door open. The scissor link member is releasable such that the pair of links pivot about the central pivot point when the scissor link member is released, thereby enabling closing of the door. The pair of links fold into a nested arrangement when the door is fully closed. The pair of links are configured to deform under dynamic loads to protect the surrounding aircraft structure and indicate a need for inspection.
1. A door stop mechanism for use with an aircraft door, the door stop mechanism comprising:
a first link configured to be rotatably coupled to the aircraft door, the first link rotatable about a first pivot point;
a second link configured to be rotatably coupled to a floor, the first link rotatable about a second pivot point;
a third pivot point, wherein the first link is rotatably coupled to the second link via the third pivot point;
wherein the first link and the second link are configured to rotate to a hold-open position in which ends of the first and second links abut one another to hold the aircraft door open; and
wherein the first link nests within the second link to form a nested arrangement when the door is closed.
2. The door stop mechanism of claim 1 , wherein the first link and the second link are configured to deform due to a predetermined force applied to the door, thereby preventing damage to a surrounding aircraft structure.
3. The door stop mechanism of claim 2 , wherein a deformation of the first link and the second link due to the predetermined force comprises a permanent set in the first link and the second link indicating a need for replacement of the links and inspection of the surrounding aircraft structure.
4. The door stop mechanism of claim 1 , wherein the second link comprises a curved shape configured for nesting within a curved shape of the first link such that the second link nests within the first link when in a closed position.
5. The door stop mechanism of claim 1 , comprising a door bracket mounted to the aircraft door, wherein the door bracket is rotatably coupled to the first link.
6. The door stop mechanism of claim 1 , comprising a floor bracket mounted to the floor, wherein the floor bracket is rotatably coupled to the second link.
7. The door stop mechanism of claim 1 , comprising a release member that protrudes the second link, wherein the release member is configured for enabling a user to pull the second link to release the second links from abutting the first link thereby enabling the door to be closed.
8. The door stop mechanism of claim 4 , wherein the door comprises a groove configured to receive a portion of the first link in the closed position.
9. The door stop mechanism of claim 6 , comprising a spring operatively coupled to the second link, wherein the spring is configured to bias the second link to the hold-open position for automatically securing the door stop mechanism in the hold-open position when the door is fully open.
10. An aircraft door stop apparatus, comprising:
a first link pivotably coupled to a door about a first pivot point;
a second link pivotably coupled to a floor about a second pivot point; and
a third pivot point, wherein the first link and the second link are jointly coupled together about the third pivot point,
wherein the first link nests within the second link to form a nested arrangement when the door is closed, and
wherein the first pivot point, the second pivot point, and the third pivot point are aligned with one another to form an aligned arrangement when the door is fully open.
11. The door stop apparatus of claim 10 , wherein an end of the first link is configured to abut an end of the second link adjacent the third pivot point such that the third pivot point may be pushed into a hold-open arrangement for holding the door fully open.
12. The door stop apparatus of claim 11 , comprising:
a spring coupled to the first link, wherein the spring is configured to bias the first link into the hold-open arrangement; and
a release member operatively coupled to the first link, wherein displacement of the release member is configured to move the first link from the hold-open arrangement enabling closing of the door.
13. The door stop apparatus of claim 11 , wherein the first link and the second link are configured to permanently elongate under a predetermined force applied to the door to prevent damage to a surrounding structure and to indicate a need for inspection of the surrounding structure.