Hensley Arrow: How does it REALLY work?

A Test of the Rigid One Way Hinge (RowH) Hypothesis

I got to thinking -- if one can rig up a "demonstration" to show that the Hensley Arrow is a Rigid one way Hinge, perhaps I can "prove" that a simple two-leaf door hinge also is a RowH. I actually performed this test, but have no "proof" photos to post because I do not have a digital camera. However, anyone can duplicate this test in the privacy of his own home. A "supporting diagram" follows the discussion of the test.

Test # 1 -- I opened an outside door to a 45 degree angle. Then, I attached a rope to the two door knobs and pulled as hard as I could at a 45 degree angle. The hinge must have locked. The door did not swing a bit. The hinge was rigid.

Test # 2 -- Wanting to be fair, I decided I should test pulling at more than one angle. I attached a 30-inch bar clamp (the yellow object) to the edge of the door. I then tied the rope to the end of the bar and pulled at an angle of 90 degrees to the wall. Again the door did not swing. Obviously, even with a change of pulling angle, the hinge remained locked. The hinge was rigid.

Test # 3 -- Then I decided to see if it would make a difference if the pulling was initiated from inside the house rather than from outside the house. I reversed the direction of the bar clamp and pulled at an angle of minus 90 degrees. To my surprise, the door swung freely with almost no force on the rope. The hinge was not rigid.

I submit that this is proof that this simple door hinge is a RowH. Initiate the pull on the door from the outside and the hinge is locked. Initiate the pull from the inside and the hinge is free.

Rigid one way Hinge, "RowH". I like that acronym. It reminds me of being in the eighth row of a theatre -- a place where elaborate fictitious productions are staged. :W