Lifeboat disengagement system
The present invention provides a system for supporting and releasing a twin fall lifeboat, comprising a pair of hooks releasably engaged with a corresponding pair of lifting links; and a lifeboat release assembly. The lifeboat release assembly includes a release handle, a release arm, an emergency release shaft, a weighted rack, and a pair of flexible cables attached at first ends to the rack and attached at second ends to the hooks. The release handle attaches to the release arm at a pivot point. The release arm includes a wheel disposed within a wheel encasement attached to the weighted rack. The system includes an engaged configuration in which the lifting links are secured by the hooks. The release handle is pulled to release the lifting links from the hooks substantially simultaneously. An emergency ratchet lever engages with the emergency release shaft for releasing the twin fall lifeboat under load.
1. A system for supporting and releasing a twin fall lifeboat, comprising:
a pair of hooks releasably engaged with a corresponding pair of lifting links; and
a lifeboat release assembly including a release handle, a release arm, an emergency release shaft, a weighted rack, and a pair of flexible cables attached at first ends to the rack and attached at second ends to the hooks, wherein the release handle is attached to the release arm at a pivot point, wherein the release arm Deludes a wheel disposed within a wheel encasement attached to the weighted rack;
wherein the system includes an engaged configuration in which the lifting links are secured by the hooks;
wherein the release handle is pulled to release the lifting links from the hooks substantially simultaneously; and
further comprising an emergency ratchet lever for engagement with the emergency release shaft for releasing the twin fall lifeboat under load.
2. The system of claim 1 , wherein the emergency ratchet lever is configured to be engaged on a square end of the emergency release shaft.
3. The system of claim 1 , wherein pulling the release handle causes the release arm to rotate about a boss, thereby lifting the weighted rack and pulling the flexible cables, and wherein the rotation of the release arm about the boss causes the wheel to rotate transversely within the wheel encasement while the weighted rack is being lifted.
4. The system of claim 1 , wherein the system provides positive locking under load including a load over center design such that a load of the lifeboat is in line with a center of hook rotation.
5. The system of claim 4 , wherein the load over center design prevents the hook from opening inadvertently and eliminates the need for a hydrostatic device.
6. The system of claim 1 , wherein:
the hooks comprise stable hooks; and
a load of the lifeboat locks the hooks such that they do not release under load.
7. The system of claim 6 , wherein the release handle is pulled by an operator to release the lifting links from the hooks once the lifeboat is afloat in water.
8. The system of claim 1 , wherein each hook is positioned between a pair of plates and is capable of rotating about a shaft.
9. The system of claim 8 , wherein the hook includes an engaging surface that is provided with a predetermined arcuate shape.
10. The system of claim 8 , wherein the plates include a release surface which is vertically extended and curved relatively toward a rearward portion of the hook.
11. The system of claim 10 , wherein the release surface acts to positively disengage the lifting link held by the hook during disengagement.
12. The system of claim 8 , further comprising a counter weighted retaining device which captures a lifting link before a load is applied.
13. The system of claim 12 , wherein:
the hook is engaged with the lifting link by passing the lifting link between the hook and the counter weighted retaining device, overcoming the gravity of the counter weight; and
after engagement, the counter weighted retaining device returns to its original closed position, such that a distal end of the counter weighted retaining device is in close proximity to a distal end of the hook.
14. The system of claim 1 , wherein a square end of the emergency release shaft is disposed on a keyed shaft on which a keyed pinion is mounted, wherein the keyed pinion engages a plurality of teeth of the weighted rack, such that when the emergency ratchet lever is pulled, the weighted rack is caused to move in an upward direction, thereby pulling the cables and releasing the loaded hooks.
15. The system of claim 14 , wherein the ratchet lever is rotated through 90° four to five times in order to lift the weighted rack and disengage the hooks while under load.
16. A system for supporting and releasing a twin fall lifeboat, comprising:
a pair of hooks releasably engaged with a corresponding pair of lifting links; and
a lifeboat release assembly including a release handle, a release arm, an emergency release shaft, a weighted rack, and a pair of flexible cables attached at first ends to the rack and attached at second ends to the hooks, wherein the release handle is attached to the release arm at a pivot point, wherein the release arm includes a wheel disposed within a wheel encasement attached to the weighted rack;
wherein the system includes an engaged configuration in which the lifting links are secured by the hooks;
wherein the release handle is pulled by an operator, rotating the release arm about the a boss, thereby lifting the weighted rack and pulling the flexible cables releasing the lifting links from the hooks substantially simultaneously; and
further comprising an emergency ratchet lever for engagement with the emergency release shaft for releasing the twin fall lifeboat under load.
17. The system of claim 16 , wherein the emergency ratchet lever is configured to he engaged on a square end of the emergency release shaft of the lifeboat release assembly and pulled in a counter-clockwise direction to release twin fall lifeboat under load.
18. The system of claim 16 , wherein the ratchet lever is rotated through 90° four to five times in order to lift the weighted rack and disengage the hooks while under load.
19. A twin fails lifeboat disengagement system for comprising:
a pair of hook assemblies; and
a lifeboat release assembly including a release handle, a release arm, a weighted rack, and a pair of flexible cables attached at first ends to the rack and attached at second ends to a hook, wherein the release handle is attached to the release arm at a pivot point, wherein the release arm includes a wheel disposed within a wheel encasement attached to the weighted rack.
20. The system of claim 19 , further comprising an emergency ratchet lever for use in releasing the twin fall lifeboat under load, wherein the emergency ratchet lever is engaged on a square end of an emergency release shaft of the lifeboat release assembly and pulled in a counter-clockwise direction to release twin fait lifeboat under load.
21. A twin falls lifeboat comprising:
a lifeboat;
a twin falls lifeboat disengagement system coupled to the lifeboat, the disengagement system comprising:
a pair of hook assemblies; and
a lifeboat release assembly including a release handle, a release arm, a weighted rack, and a pair of flexible cables attached at first ends to the rack and attached at second ends to a hook, wherein the release handle is attached to the release arm at a pivot point, wherein the release arm includes a wheel disposed within a wheel encasement attached to the weighted rack.
22. The system of claim 21 , further comprising an emergency ratchet lever for se in releasing the twin fall lifeboat under load, wherein the emergency ratchet lever is engaged on a square end of an emergency release shaft of the lifeboat release assembly and pulled in a counter-clockwise direction to release twin fall lifeboat under load.