I spent a couple of hours blocking in this design for a power drawbar concept based on a pancake air cylinder mounted directly on top of the drawbar. My initial design was based on an air cylinder mounted inside the head but it didn't take into account the load applied to the spindle bearings. This design utilizes a floating plate that forces a ring up against the belevue washer stack whenever the air cylinder is activated. The plate is held in position by 4 spring loaded bolts fastened at each corner of the air cylinder's mounting plate. My hope is that It will relieve the pressure from the spindle bearings.
I am still in the early design phase and will likely go back to my initial plan to mount the air cylinder internally but I wanted to post this design to get some feedback from more experienced and knowledgable people than myself before I bother with trying to incorporate it into the final design. If anyone sees any flaws or has any advice to offer then please post it here.... I would greatly appreciate it!