| 摘要 |
<p>The device includes a frame for supporting a boat, the frame supporting at least two inflatable rollers that can act as wheels when inflated so that the device forms a vehicle to convey the boat into and out of the water. With the rollers inflated, the device has positive buoyancy so as to engage the hull of the boat. By partially or completely deflating the rollers, the device can be brought to negative buoyancy, so as to drop away from the bottom of the boat after launching, or conversely to enable it to be moved along the bottom to a position beneath the boat prior to reinflation of the rollers and engagement of the boat for beaching.</p> |
