Just to add detail to Mr Hause's post, the first Westley Richards top rib extension bolt, his 'Doll's head,' was indeed patented in 1862 (patent No. 2506 of 1862), but it had a pull-lever, not the swing-lever described by Greener. Westley Richards' swing-lever patent was in 1864 (patent No. 2623 of 1864). Both use only the top extension as the locking lug, there are no bolts engaging the lumps under the barrels, which only serve to hook with the hinge pins.

Here is the 1862 pull-lever version:
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

And here is the 1864 lateral-lever version:
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]