PART SIX-A � Patent 60545 � Mower
Roy Knight�s Patent 60545 is the second from 1973 that I record here.
1973 must have been a tumultuous year, given that the Scott Bonnar
company would change its ownership again � from the Electrolux Group
(1970-1973) to NZ�s Challenge Corporation (1973-1980).

But 1973 must have also been a furtive year for Roy Knight, and this is
arguably his most important reel mower patent. Many thanks to researcher
Max Western for bringing this patent to my attention.

I think I can make the claim that Roy Knight�s patent was the inspiration
behind what would become, in a few years, the Scott Bonnar Diplomats �
the 590s and 430s of the era. This patent reveals the basic design
precepts that underpin that controversial design.

I can�t say the accompanying illustration from the patent gives the game
away. The devil and detail are in the patent itself. But can you see what�s
going on?

[Linked Image]

TO BE CONTINUED ...