Locking the cowl doors of a turbojet
View Patent ↗Turbojet cowl doors have bottom longitudinal edges fitted with hooking means and with locking means which comprise catches fixed on a rotary drive shaft carried by one of the doors and which co-operate with hooking members hinged about an axis on the other one of the doors.
1. Turbojet cowl doors, each door having a top longitudinal edge hinged about a longitudinal axis and a bottom longitudinal edge comprising locking means for fastening to a bottom longitudinal edge of the other door, the locking means comprising locking members pivoted on the bottom longitudinal edge of a first door and co-operating with hooking members mounted on the bottom longitudinal edge of a second door, wherein the locking members are catches each of which is fixed to a rotary drive shaft parallel to the hinge axis of the first door and is movable between a locking angular position and an unlocking angular position, and wherein the hooking members are tabs each of which is mounted on the bottom longitudinal edge of the second door to pivot about a pivot axis parallel to the hinge axis of the second door and comprises a U-shaped notch whose opening faces towards said pivot axis and is designed to receive a portion of a corresponding catch in order to be moved by said catch between a locking angular position and an unlocking angular position.
2. Cowl doors according to claim 1 , wherein the catches are carried on a common rotary drive shaft and are movable simultaneously between their locking angular positions and their unlocking angular positions.
3. Cowl doors according to claim 1 , wherein the hooking members are independent from one another, each being associated with a return spring urging it towards the unlocking position.
4. Cowl doors according to claim 1 , wherein the hooking members project outside the second door when in their unlocking position.
5. Cowl doors according to claim 1 , wherein the hooking members are in alignment with the longitudinal edges of the doors when in their locking position.
6. Cowl doors according to claim 1 , wherein said portion of the catch is a cylindrical finger which is parallel to the catch drive shaft and which is connected to said shaft by one or two tabs perpendicular to the shaft and to the finger.
7. Cowl doors according to claim 1 , wherein the catches hooked onto the hooking members in their unlocking position form means for moving the bottom longitudinal edges of the doors towards each other while they are being driven towards their locking position.
8. Cowl doors according to claim 1 , wherein the locking position of each catch lies beyond a position of unstable equilibrium in which the catch is in alignment with the axis of the drive shaft and with the pivot axis of the corresponding hooking member.
9. Cowl doors according to claim 8 , wherein, in said position of unstable equilibrium, the catch bears axially against the bottom of the U-shaped notch of the hooking member.
10. Cowl doors according to claim 2 , wherein the catches are movable between their locking and unlocking positions by means of a handle connected to their rotary drive shaft.
11. Cowl doors according to claim 10 , wherein the handle forms a force multiplying lever.
12. Cowl doors according to claim 10 , wherein the handle is hinged to the first door about an axis parallel to the axis of the catch drive shaft and includes a rectilinear slot in which there is engaged a finger carried by the drive shaft and off-center relative thereto.
13. Turbojet cowl doors comprising:
a first door having a first edge;
a catch disposed on said first edge;
a second door having a second edge;
a hooking member disposed on said second edge and pivotable about a pivot axis, said hooking member having a U-shaped notch with an opening facing said pivot axis;
wherein in a first position, said hooking member and said catch are positioned such that said catch is received in said U-shaped notch of said hooking member, and
wherein said hooking member is pivotable about said pivot axis to move from said first position to a second position, wherein in said second position, said catch is not in said U-shaped notch.
14. Cowl doors according to claim 13 , wherein in said first position, said first edge is locked against said second edge.
15. Cowl doors according to claim 14 , wherein in said second position, said first edge is not locked against said second edge.
16. Cowl doors according to claim 13 , wherein said first door has a top longitudinal edge hinged about a first longitudinal axis.
17. Cowl doors according to claim 16 , wherein said catch is coupled to a rotary drive shaft parallel to said first longitudinal axis.
18. Cowl doors according to claim 16 , wherein said second door has a top longitudinal edge hinged about a second longitudinal axis.
19. Cowl doors according to claim 18 , wherein said pivot axis is parallel to said second longitudinal axis.