So it appears it was William Field????:

"William Field was a Birmingham gunsmith who patented his falling block design in 1877 and, as I understand it, made his own actions which he supplied to other gunmakers such as Holland and Holland, Greener and Hollis, who then created rifles around Fields action. As can be seen from the pictures of the sale rifle the stock is reinforced through the pistol grip into the but stock to ensure stable mounting of the action and prevent stock splitting. It is common to find this on Fields patent falling block rifles from Holland and Holland."


http://revivaler.com/holland-holland-fields-patent-falling-block-rifle/

U.S. of A. Patent Nr. US-200,041

Cheers,

Raimey
rse