SIDE ROLLING
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| The side-rolling and end-rolling hatch covers are popular for use on the weatherdecks of larger bulk |
| carriers such as Panamax andCapesize types. In the case of ore/bulk/oil (OBO’s) and ore/oil carriers, |
| designed the covers are to sustain internal liquid loads. |
| For open hatch bulk carriers (OhBC’s), rolling covers of the piggy-back type are preferred as the deck |
| allows little or no free space for stowing the covers when the hatches are open . |
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| Rack and pinion drive |  |
| Effective operation of the covers is ensured by a rack and | |
| pinionsystem with the drive each panel provided by a slow | |
| speed hydraulic motor. Located at panel centreline the | |
| motor is mounted with the shaft vertical at the coaming and | |
| engaged viaa pinion with a rack, which is fitted to underside | |
| of the panel. | |
| Guidance of the panels is by means of double-anged wheels | |
| at one end. |
| Rack and pinion drive |  |
| This system uses either a continuous chain on one side (one- | |
| sided drive) or on the bothsides (two-sided drive) to operate | |
| the both panels of a twin-panel cover. The two-sided type is | |
| a driven by a medium-speed hydraulic motor with a planetary | |
| gear and is mounted on the ship’s deck at one side between | |
| the stowing ramps. The operating chains, which are guided | |
| along both of the transverse coamings are connected cross- | |
| wise to the arms. | |