| 摘要 |
323,880. Franklin, H. A., Partridge, R. J., and Roberts, E. A. Nov. 30, 1928. Boat-lowering gear comprises a davit displaceable transversely of the ship and angularly adjustable when outboard. A transverse gantry a supports the davit girder b which is extended over either side of the ship by rack and pinion gear. When outboard, a pinion h on the inboard end of the girder b engages with a fixed toothed quadrant g and controls the movement of the girder b into alignment with the gantry. The angular disposition of the girder b is controlled by tackles w which the davit picks up from pegs B during its outboard movement, the tackles passing over samson posts Y. Bridge members s, Fig. 8, span the gap between the inner end of the girder b and the outer end of the gantry a. The boatlowering tackle comprises ropes k paid out from bollards z as the girder b is displaced outwardly where they engage with end pulleys m on to which they are locked by the fall of a key M. The ropes k are provided at intervals with thimbles n, Fig. 4, which pick up hooks o on wheels q which run freely on rails on the underside of the girder b. Links N<1> connect the hooks o to boat-suspension hooks p carried by distance pieces P about equal to the width of a boat. When the pair of wheels supporting the boat reaches the end of the girder b and an inboard flap Q, the boat descends the rope k now passing over pulley V. The weight of the descending boat serves to transport outboard the next boat which has been picked up by an adjacent pair of thimbles n. |
