Patent application number | Description | Published |
20090108245 | Door release mechanism - A door hoist includes a bracket, drive sprocket, ring gear, hub assembly, set of planetary gears, and governor shaft. The drive sprocket has a drive sprocket axis. The ring gear is fastened to the drive sprocket. The ring gear has a ring gear axis that is in alignment with the drive sprocket axis. The hub assembly includes a connector to receive a door drive shaft and secure the door drive shaft in a fixed rotational alignment with the hub assembly. The set of planetary gears is rotationally mounted to the hub assembly. The set of planetary gears is configured to mate with the ring gear. The governor shaft includes a sun gear, brake assembly, and link. The sun gear is configured to mate with the set of planetary gears. The brake assembly has an engaged position and a disengaged position. The sun gear is rotationally fixed relative to the bracket in response to the brake assembly being in the engaged position. In response to the brake assembly being in the disengaged position, rotation of the sun gear is unfixed relative to the bracket. The link secures the brake assembly in the engaged position. The link is configured to melt in response to an ambient temperature exceeding a predetermined temperature. | 04-30-2009 |
20130269881 | DOOR RELEASE MECHANISM - A door mechanism includes a door shaft, a drive sprocket fixed to the door shaft, a holding brake to counter a closing bias of the door, and a holding brake sprocket that is rotationally coupled to the drive sprocket. A freewheel is coupled to the holding brake sprocket to facilitate free rotation of the holding brake sprocket in a first direction. A first brake is coupled to the holding brake sprocket via the freewheel to provide resistance to rotation of the door shaft in a second direction. A door release includes a drop wheel coupled to the holding brake sprocket, a brake drive sprocket, a drop arm and a second brake to provide resistance to the brake sprocket when the brake sprocket exceeds a predetermined braking speed. | 10-17-2013 |
20140250796 | DOOR RELEASE MECHANISM - A door hoist includes a bracket, drive sprocket, ring gear, hub assembly, set of planetary gears, and governor shaft. The drive sprocket has a drive sprocket axis. The ring gear is fastened to the drive sprocket. The ring gear has a ring gear axis that is in alignment with the drive sprocket axis. The hub assembly includes a connector to receive a door drive shaft and secure the door drive shaft in a fixed rotational alignment with the hub assembly. The set of planetary gears is rotationally mounted to the hub assembly. The set of planetary gears is configured to mate with the ring gear. The governor shaft includes a sun gear, brake assembly, and link. The sun gear is configured to mate with the set of planetary gears. The brake assembly has an engaged position and a disengaged position. The sun gear is rotationally fixed relative to the bracket in response to the brake assembly being in the engaged position. In response to the brake assembly being in the disengaged position, rotation of the sun gear is unfixed relative to the bracket. The link secures the brake assembly in the engaged position. The link is configured to melt in response to an ambient temperature exceeding a predetermined temperature. | 09-11-2014 |