Device for constraining actuator motion during a dynamic event
A device for constraining rotational motion of an actuator such as a seat actuator during a dynamic event. The device includes a first part attachable to a fixed frame member and carrying a first clip, and a second part attachable to an actuator and carrying a second clip. Prior to and following a dynamic event sufficient to cause actuator rotational motion the first clip and the second clip are disengaged. During the dynamic event the second clip is configured to engage the first clip to momentarily stop rotational motion of the actuator such that load on the actuator passes through the actuator shaft into the frame. In embodiments, the device is configured to minimize actuator deformation during a dynamic event while allowing a full range of standard motion during normal use of the actuator.
1. A passenger seat, comprising:
a seat pan including a transverse frame member;
a seat back rotationally coupled to the seat pan;
an actuator coupled at a first end to the seat pan and at a second end to the seat back, the actuator operable to control rotational motion of the seat back relative to the seat pan, and the actuator including a shaft; and
a device configured to constrain rotational motion of the seat back during a dynamic event, the device comprising:
a brace pivotally attached at one end to the seat back and including a free end having a profile matching a profile of the transverse frame member; and
a biasing member configured to bias the free end of the brace toward the transverse frame member;
wherein, prior to a dynamic event sufficient to cause actuator rotational motion, the free end of the brace is disengaged from the transverse frame member; and
wherein, during a dynamic event sufficient to cause actuator rotational motion, the free end of the brace is configured to move into engagement with the transverse frame member to stop rotational motion of the seat back in a rearward direction relative to the seat pan.
2. The passenger seat according to claim 1 , wherein, during the dynamic event sufficient to cause rotational motion of the actuator, the seat back is configured to rotate forward relative to the seat pan thereby causing the link to follow along an outer surface of the transverse frame member until the free end is clear to engage the outer surface of the transverse frame member.
3. The passenger seat according to claim 1 , wherein each of the transverse frame member and the free end of the brace has a rectangular cross-section.
4. The passenger seat according to claim 1 , wherein the dynamic event sufficient to cause actuator rotational motion is at least a 12 g-force event.