System for controlling the speed of movement of a sliding door and associated aircraft

Patent metadata

Field	Value
Publication number	US-2025075549-A1
Application number	US-202318726986-A
Country	US
Kind code	A1
Filing date	Jan 10, 2023
Priority date	Jan 28, 2022
Publication date	Mar 6, 2025
Grant date	—

Abstract

The system for controlling the speed of opening a sliding door for an aircraft including a mechanical braking device for the door including a transmission shaft and a centrifugal absorber including a resistance shaft connected to the transmission shaft, and linking means that are designed to be connected to the sliding door and to cooperate with the transmission shaft so that when the sliding door moves in a predetermined direction, the linking means drive the transmission shaft and the centrifugal absorber applies a resistance torque to the transmission shaft in order to control the speed of movement of the door. The system includes a speed reducer connecting the resistance shaft to the transmission shaft so that the speed of rotation of the resistance shaft is greater than that of the transmission shaft when the sliding door moves in the predetermined direction.

First claim

1 . System for controlling the speed of opening a sliding door for an aircraft, the system comprising a mechanical braking device for the door, the mechanical braking device including a transmission shaft and a centrifugal absorber comprising a resistance shaft connected to the transmission shaft, and linking means that are designed to be connected to the sliding door and to cooperate with the transmission shaft so that when the sliding door moves in a predetermined direction, the linking means drive the transmission shaft and the centrifugal absorber applies a resistance torque to the transmission shaft in order to control the speed of movement of the door, wherein the system comprises a speed reducer connecting the resistance shaft to the transmission shaft so that the speed of rotation of the resistance shaft is greater than that of the transmission shaft when the sliding door moves in the predetermined direction.

2 . System according to claim 1 , wherein the centrifugal absorber comprises a cylinder coated with a friction material and flyweights disposed inside the cylinder and connected to the resistance shaft by connecting links so that the flyweights rub against the friction material under the effect of the centrifugal force when the speed of rotation of the resistance shaft is greater than or equal to a predetermined speed threshold.

3 . System according to claim 1 , wherein the braking device further comprises a clutching device connecting the resistance shaft to the belt so that the clutching device is clutched when the door moves in the predetermined direction and is declutched when the door moves in a direction other than the predetermined direction.

4 . System according to claim 1 , the aircraft having a guide rail of predetermined length guiding the sliding door, the linking means being configured to immobilize and retain the sliding door in the guide rail when the travel of said door in the predetermined direction is longer than the length of the rail.

5 . System according to claim 1 , the aircraft having a guide rail of predetermined length guiding the sliding door, the linking means being configured to release the sliding door when the travel of said door in the predetermined direction is longer than the length of the rail.

6 . System according to claim 1 , wherein the linking means comprise a belt, the braking device further comprising a winding mechanism configured to wind the belt around the transmission shaft when the door moves in a direction other than the predetermined direction.

7 . System according to claim 6 , having a winding drum supporting the belt, the drum being connected to the transmission shaft.

8 . System according to claim 6 , wherein the length of the belt tensioned between the door and the transmission shaft is shorter than the length of the rail.

9 . System according to claim 6 , wherein the belt and the drum comprise separation means for separating the belt from the sliding door or from the transmission shaft when the travel of said door in the predetermined direction is longer than the length of the rail.

10 . Aircraft comprising a sliding door and a system according to claim 1 connected to the sliding door.

Assignees

• Safran Electronics & Defense

Inventors

• Hors Daniel
• Bur Célina

Classifications

• E05F5/00

  Braking devices, e.g. checks; Stops; Buffers (construction of pneumatic or liquid braking devices E05F3/00; braking devices, buffers or end stops on drawers for tables, cabinets or like furniture A47B88/473; combined with devices for holding wings open E05C17/00; devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing E05C17/04) · CPC title

• E05F5/003 Primary

  for sliding wings (Fasteners specially adapted for holding sliding wings open E05D13/04) · CPC title

• B64C1/14 Primary

  Windows; Doors; Hatch covers or access panels; Surrounding frame structures; Canopies; Windscreens {accessories therefor, e.g. pressure sensors, water deflectors, hinges, seals, handles, latches, windscreen wipers}(fairings movable in conjunction with undercarriage elements B64C25/16; bomb doors B64D1/06) · CPC title

• E05Y2900/502

  for aircraft or spacecraft · CPC title

• E05Y2201/26

  Mechanical friction · CPC title