The first overhead cam engine?

摘要

Was this the world's first overhead cam engine design? From the little we can find, it just may have been. Patented by engineer J.W. Raymond, San Francisco, California, in 1892, it preceded the overhead camshaft Springfield Model A, produced by Springfield Gas Engine Co., Springfield, Ohio, starting in 1895. In Raymond's design the camshaft was mounted horizontally at the top of the cylinder head of the vertical engine and chain-driven off the crankshaft at one end. At the other end was a flyball governor to control engine speed.