1704 Acct. 16 Sept. in T. Bowrey (1927) ii. i. 178 4 hatch Rings and starts.
1850 J. Greenwood Explan. Terms 142 Hatch-rings are those which are fixed to the hatches or scuttles.
2009 C. Burgess & R. Hall 252 He would also..take photographs with a camera he had mounted on a hatch ring on the end of the airlock.