Single pull macgregor type hatch cover.pdf - Cochin University of ...

2.1 SINGLE PULL
2.1.1 Description
Figure 2.1 single pull hatch cover
Source: - Walter Vervloesem – IMCS
The classic modern hatch cover is the ‘single pull’ which remains the most common
of the all the various forms now in service and may rightly be described as the natural
successor to traditional beams and boards. This cover derives its name from its
immediate predecessor, the ‘multi-pull’ cover, which consisted of a series of
individual panels similar to those of the single pull, but unconnected. Each panel had
to be rigged before being pulled one at a time into stowage.
The complete cover consists of a number of narrow panels which span the
hatchway and are linked together by chains. In the closed position, the panel sides sit
firmly which takes the weight of the cover. Just inside the side plate is a rubber gasket
attached to the cover, which rest on a steel compression bar forming a watertight seal.
Extending from the side coamings at the end of the hatchway where the covers are
stowed are steel rails which the individual hatch panels to be transferred to their
stowage location when the hatch is opened. Although single pull covers rarely exceed
16 m in width, larger sizes can be manufactured.
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