Please identify mystery linkage on this 0-6-0

[up1950s]

On the Shay the bar from the cab does not move in and out , but it would twist . The first levers attached to it are fixed and act as cranks . All the other connections are free to move pivot points .

Given that might the 0-6-0 follow that method some how ?

Found this Shay cab , item 123 .
http://www.shaylocomotives.com/draw/Shay-cab-controls-GRK.gif

[DKS]

Given that might the 0-6-0 follow that method some how ?

No. In most rod locomotives, the control is push-pull. I will try to get out to Pine Creek sometime soon and document the system in detail.

Meanwhile, here's another view of the sliding bar cylinder cock mechanism.

[up1950s]

Agreed , here is one with the lever ( not connected to the cab rod ) but on the wheel side of the cylinder .

http://www.coppercountryexplorer.com/wp-content/uploads/2015/01/loco7.jpg

[up1950s]

Found this , modern method uses a ramp . Lousy pic but it answers lots .

 

[DKS]

Found this , modern method uses a ramp . Lousy pic but it answers lots .

Yeah, saw that in my searches as well. Diagram is for making a model cylinder cock for live steam.

[up1950s]

At least the ones where the bar is inline with the cock .

There might be a rotary ramp design as well .

[DKS]

Digging deeper, I unearthed the Locomotive Dictionary, published in 1916, which provides some more clarity.

First, a drawing of a drain cock. This cutaway view is looking at it from the front or back; the overlapping rectangles at the bottom represent the slot through which the sliding bar passes. The valve itself looks for all the world like a bathroom sink pop-up stopper.



The next drawing illustrates how the cocks are actuated, including all of the linkage parts.


 
Finally, here are the proper names of all of the parts.



What I've been calling the "slider bar" is #19, Cylinder Cock Slide Rod. What I called the "bell crank" is #15, Cylinder Cock Shaft Arm. What I called the "intermediate linkage" is the Cylinder Cock Slide Rod Connection. The system is controlled by #20, the Cylinder Cock Lever, via #17, the Cylinder Cock Reach Rod. The two Cylinder Cock Shaft Arms are connected by #16, the Cylinder Cock Shaft.
 

[DKS]

Taking the above information and applying it to my earlier drawing, we end up with this:

[Chris333]

Excellent! 

[DKS]

I also think I finally see what was tripping Max up about this photo:



The way it's shot, it looks as if the intermediate linkage runs diagonally under the cylinder. If that were the case, then yes, there would be difficulty operating it. However, in reality the intermediate linkage runs very nearly parallel to the sliding bar; in the photo, it's tilted on a slight incline, which creates the illusion it runs diagonally. The end of the shaft arm (bell crank) curves under the cylinder toward the linkage. See the front view of the linkage in this illustration:

[DKS]

Bringing it full circle:

[peteski]

That is now clear enough.
But as I said earlier, I seem to recall seeing ball-type cocks on some locomotive. Those were opened and closed by a 90 degree (or maybe less) rotation. Maybe it was on a European loco.

[up1950s]

That is now clear enough.
But as I said earlier, I seem to recall seeing ball-type cocks on some locomotive. Those were opened and closed by a 90 degree (or maybe less) rotation. Maybe it was on a European loco.

Well they could be using a rotating ramp .

[mmagliaro]

Thanks, but in this case I think it's a very simple mechanism that has proven to be very difficult to explain, for reasons I can't quite fathom.

NOW I get it!  That last schematic drawing you made up did the trick.  The intermediate link doesn't come out perpendicularly from the curved arm to the valve bar.  Now that I see how you drew it, I totally understand how it can work, AND
that link being kind of a Z shape like that perfectly fits what I can make out in the SP&S 0-6-0 photo.
So I need to remake my link, unfortunately.  But now I can see how to do it.

Thank you for the patience, the drawing, and the information!

[Chris333]

You're going to need a locomotive inspection pit with the floor cut out so you can take photos of the bottom