I had this post all completed, then went to add some background information when I discovered that Craig had already added the first page of the patent to his post about the FC-170 Power Hoe. So, lots of heavy lifting in terms of content can be found here, while below you can view the whole patent. I think the illustrations are pretty neat.
Craigs FC-170 Power Hoe page: http://www.thefcconnection.com/Historical%20Literature/Custom%20Built%20Vehicles/The%20Lafian%20Powerhoe/FCaaca/FCaaca.pdf
F C POWER HOE … no comment