Edit post

Edit your reply below.

Post Body
Enter your post below.
In thinking about this thread again, here is a synopsis of its development: <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> It starts with a question about the date and/or identity of a found coupler. <o:p></o:p> Quentin asked if anyone can explain how the forces are transferred through a coupler. <o:p></o:p> A general assumption was expressed that the knuckle pulls on the knuckle pin while the locking pin prevents the knuckle from rotating open.  So the pulling force is transmitted from the knuckle, to the knuckle pin, and to the coupler body. <o:p></o:p> This assumption was disproved by the assertion that the knuckle pin plays no role in the force transfer because a coupler will function in pulling a load with the knuckle pin missing.   <o:p></o:p> It was pointed out that there is a circular groove on the knuckle tang concentric with the knuckle pivot axis that engages a corresponding circular ridge on the coupler body when the knuckle is closed.  These features, dubbed “force ridges,” transmit the pulling force from the knuckle to the coupler body in a straight line, parallel with, and centered on the coupler longitudinal centerline axis.   This revelation raised the question of how a pulling force can induce a knuckle to open when the locking pin is lifted.  In other words, why wouldn’t the pulling force simply transfer straight through the knuckle to the force ridges with the knuckle acting like a link in a stretched chain?   The knuckle is not free to rotate when a pull loads it against the force ridges, so why doesn’t it bind and refuse to rotate when you pull the locking pin and try to pull away in an uncoupling move?  This basic question develops and is explored on pages 6 and 7 of this thread.   There are further mysteries to be resolved as soon as cordon gets that coupler disassembled and photographs the pieces.
Tags (Optional)
Tags are keywords that get attached to your post. They are used to categorize your submission and make it easier to search for. To add tags to your post type a tag into the box below and click the "Add Tag" button.
Add Tag