Dyson
All the Dyson cleaners I know of take the suction off the cleaning head when stood upright. In newer 01 models and on all of the 03 I think, this was done by sealing off the suction completely, that is to say effectively blocking the airflow. This of course would cause the motor to overheat if left like it for long enough. The early 01 cleaners allowed air to escape from vents in the cleaning head when the machine was stood upright, but this required a valve in the hose socket and the design was so problematic that not only did Dyson stop fitting it, they also took it out of a good deal of cleaners which were sent back to the factory for repair.
On later models from 04 onwards, suction was diverted to the hose when the cleaner was stood up, but as all cleaners had caps over the hole in the wand, the potential was still there for the cleaner to overheat. I have not see the ball-style cleaners in much detail but I have been told that these cleaners allow the suction to carry on through the front of the cleaning head until the hose is removed. To be truthful, I cannot see what the problem was in having the suction running through the cleaner head when the cleaner was stood upright, but Dyson didn't like it, I expect.
However, how this applies to the vintage juniors in the picture, I am not sure.