Forum Discussion
Ron_Gratz
Jun 07, 2005Explorer
Stressor wrote:
The diagram is meaningless unless you specify some point of fixity. Lets assume that A-C and B-C are pinned at C. Then, if you push UP at B, without any lateral restraint at B, B-C would simply rotate clockwise about C. There can be no lateral force applied at C unless there is a corresponding lateral force applied at B.
Again, the diagram is meaningless unless you specify some point(s) of fixity. If points D and E are fixed in space and length A-B is constant, then pushing UP at B would cause the following:
1. B-E will rotate CCW about E, causing B to move right and forward.
2. A must remain at fixed distance from B, so A moves right and rearward. A-B rotates CCW.
3. A-D pivots CCW about D.
The linkage is not "locked". D-E is fixed in space and all three other links are free to simultaneously translate and rotate.
Another meaningless diagram. Point C is not the Virtual Pivot Point. The VPP is the point of convergence for one line projected through points A and D and another line projected through points B and E.
Sorry, Milt, but your depiction is NOT how it works.
Ron
About Tow Vehicles
From fifth wheels to teardrop trailers and everything in between.244 PostsLatest Activity: Apr 27, 2026