Locking device, in particular a storage device for a breathing mask intended to supply oxygen in an aircraft and oxygen supply system
Locking device comprising: a support, a first locking member and a second locking member, the first locking member being mounted on the support and configured to move between a locked position and an unlocked position, an intermediate member movable between a retaining position and a release position, the intermediate member in the retaining position retaining the first locking member in the locked position, and a shape-memory member, the shape-memory member being connected to the intermediate member and configured to move the intermediate member to the release position when the shape-memory member is activated.
1. Locking device comprising:
a support,
a first locking member and a second locking member, the first locking member being mounted on the support and configured to move between a locked position and an unlocked position, the first locking member engaging with the second locking member when in the locked position,
a shape-memory member having a first length when not activated and a second length when activated,
wherein:
the locking device further comprises an intermediate member movable between a retaining position and a release position, the intermediate member in the retaining position retaining the first locking member in the locked position and the intermediate member in the release position allowing the first locking member to move to the unlocked position,
the shape-memory member is connected to the intermediate member and configured to move the intermediate member to the release position when the shape-memory member is activated,
the locking device further comprises a return device,
the return device biases the intermediate member towards the retaining position, and
the intermediate member abuts against the support when in the retaining position.
2. Locking device according to claim 1 , wherein the first locking member is biased towards the unlocked position.
3. Locking device according to claim 2 , comprising an elastic arming member biasing the first locking member towards the unlocked position.
4. Locking device according to claim 2 , further comprising a magnet magnetically biasing the first locking member towards the unlocked position.
5. Locking device according to claim 1 , wherein the shape-memory member is a shape-memory wire.
6. Locking device according to claim 5 , wherein the diameter of the shape-memory wire is less than 0.5 millimeters.
7. Locking device according to claim 5 , wherein:
the shape-memory wire has a first end, a second end, and an intermediate portion, the shape-memory wire acting on the intermediate member via the intermediate portion,
the shape-memory wire has a first straight portion between the first end and the intermediate portion,
the shape-memory wire has a second straight portion between the second end and the intermediate portion, and
the first straight portion forms an angle with the second straight portion comprised between 5 degrees and 90 degrees.
8. Locking device comprising:
a support,
a first locking member and a second locking member, the first locking member being mounted on the support and configured to move between a locked position and an unlocked position, the first locking member engaging with the second locking member when in the locked position,
a shape-memory member having a first length when not activated and a second length when activated,
wherein:
the locking device further comprises an intermediate member movable between a retaining position and a release position, the intermediate member in the retaining position retaining the first locking member in the locked position and the intermediate member in the release position allowing the first locking member to move to the unlocked position,
the shape-memory member is connected to the intermediate member and configured to move the intermediate member to the release position when the shape-memory member is activated,
the locking device further comprises a return device exerting a first return force on the shape-memory member when the shape-memory member has the first length and a second return force on the shape-memory member when the shape-memory member has the second length, and
the first return force is greater than the second return force.
9. Locking device according to claim 8 ,
the locking device further comprises a return device,
the return device biases the intermediate member towards the retaining position.
10. Locking device according to claim 9 , wherein the intermediate member abuts against the support when in the retaining position.
11. Locking device according to claim 1 , wherein the intermediate member is mounted and configured to rotate about an intermediate axis of rotation between the retaining position and the release position on the support.
12. Locking device according to claim 11 , wherein the intermediate axis of rotation is fixed relative to the support and the intermediate member has a center of inertia located in the immediate vicinity of the intermediate axis of rotation.
13. Locking device according to claim 1 , wherein the first locking member is configured to rotate about a lock rotation axis between the locked position and the unlocked position on the support.
14. Locking device according to claim 13 , wherein the lock rotation axis is fixed relative to the support and the first locking member has a center of inertia located in the immediate vicinity of the lock rotation axis.
15. Locking device according to claim 11 , wherein the first locking member forms a hook.
16. Locking device according to claim 1 , further comprising a pivoting roller, the intermediate member retaining the first locking member in the locked position through the pivoting roller.
17. Storage device for a breathing mask intended for supplying oxygen in an aircraft, the storage device comprising a locking device according to claim 1 and:
a receptacle comprising a housing and a door, the door being movable relative to the housing between a closed position and an open position,
one among the support and the second locking member is carried by the housing and the other is carried by the door, and
at least one breathing mask arranged within the receptacle when the door is in the closed position.
18. Storage device according to claim 17 , wherein the storage device is configured so that the movement of the door relative to the housing from the closed position to the open position causes the movement of the first locking member to the unlocked position.
19. Aircraft oxygen supply system comprising a storage device according to claim 17 and an oxygen source connected to the breathing mask.
20. Locking device according to claim 5 , wherein:
the shape-memory wire has a first end, a second end, and an intermediate portion, the shape-memory wire acting on the intermediate member via the intermediate portion,
the shape-memory wire has a first straight portion between the first end and the intermediate portion,
the shape-memory wire has a second straight portion between the second end and the intermediate portion, and
the first straight portion forms an angle with the second straight portion comprised between 10 degrees and 45 degrees.