| 摘要 |
<p>1,205,914. Liquid cargoes transferring; counterbalancing apparatus. FMC CORP. 20 June, 1969 [11 July, 1968], No. 31306/69. Headings B8B and B8E. A marine loading arm 20, for transferring fluid between a wharf W and a floating vessel (not shown), includes an inboard arm section conduit 24 mounted upon an upstanding riser 22 for pivotal movement about an inner, generally horizontal axis Y and an outboard arm section conduit 26 connected to the inboard arm 24 for pivotal movement about an outer, generally horizontal axis Z, with a terminal coupling assembly 28. A primary assembly 30 counterbalances the arm 20 in all positions while the outboard arm 26 is in a vertical attitude, while a secondary assembly 32 counterbalances the outboard arm 26. The primary assembly 30 comprises primary counterweights 58a, 58b adjustably secured to beams 54e, 56e attached to the inboard arm 24 for rotation therewith about the axis Y on actuation of single-action hydraulic cylinders 84, 86 whose piston-rods are interconnected by a cable 88 passing around and attached to a sheave 90 non-rotatably mounted on upper riser section 36. The secondary assembly 32 comprises a counterweight 92 supported by beams 94, 96 fixed to sheaves 102, 104 so that the counterweight 92 rotates with these sheaves about the axis Y simultaneously with the rotation of sheave 110 and the outboard arm 26 about the axis Z by a doubleacting hydraulic cylinder 97 and a chain and rod assembly 112. Rods 126, 130, 132 of upper flight 112a are connected to a carriage 140 guided longitudinally of the inner arm 24 by guide 144. Lower flight 112b has its rods similarly connected to a carriage 142 in a guide 146. The arms 24, 26 can be jointly slewed about a vertical axis X by means of a swivel joint 38 between the rotatable upper riser section 36 and fixed lower section 34 of the riser 22.</p> |
