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Side Rolling type hatch covers are operated by a rack and pinion
driven mechanism with a rack gear transversely located
in the middle of the underside of each panel.
A pinion gear is positioned outside the side coaming and
engaged with the rack gear.
Each panel is fitted with its own rack and
pinion driven mechanism to allow independent operation.
Many shipowners have adopted an Auto-roll mechanism
with auto-cleats for easy and comfortable operation
without manual cleat operation.
Side Rolling type hatch covers are also operated
by a chain-driven system.
The operating chains are connected crosswise to the arms of
both panels giving simultaneous operation.
One-sided operation type and both-sided operation type are
available by a low-speed hydraulic motor mounted
on the side of longitudinal coaming.
Auto-roll mechanism with auto-cleats is also available
and recommendable to this type of hatch cover.
Piggy Back type hatch covers are adopted on multi-purpose carriers
when the deck space is insufficient to accommodate rolling covers
in the open position.
This system always comprises two panels,
one panel is lifted panel back.
Then, both panels are rolled back and forth.
Lifting of both panels is achieved by vertical hydraulic cylinders
and rolling by hydraulic motors.