Question for Valve Gear Gurus

wurlitzer153 · **Joined:** Mon Feb 10, 2014 11:27 pm **Posts:** 15

jim templin wrote:

it is a type of Marshall. I have seen some small Baldwin contractor dinkys with this valve gear. If you'd like to see a variation of this valve gear in person this side of the pond, go find a late model Keck Gonnerman steam engine with their version of this called the Miller reverse.

One thing that amazed me is how many patents for steam engine valve gears there are, and some just seem to be copies of others, the only novelty being mounted upside down

The Miller/Keck gear appears to be a copy of Baker's early design, which is descended from Marshall.

Here's the first Baker design:
http://www.google.com/patents/US721994# ... &q&f=false

And here's the Miller gear:
https://www.google.com/patents/US112536 ... CDoQ6AEwAQ

The layout is similar, isn't it? Other brands I've seen that used a similar layout included Nichols & Shepard, Reeves, Kitten, ...

This video shows the Baker gear in action (go to 6:30) on a 19-65 HP Baker:
https://www.youtube.com/watch?v=XAtNKIMDFyo

This appears to be the first version of the Baker locomotive gear we all know:
http://www.google.com/patents/US1008405 ... &q&f=false