screwless pull-up bar

thingiverse

This is an attempt to create a pull-up bar support that doesn't require any screws. It works by pushing against the door frame due to the user's weight, which wedges the sliders against the frame. Features: - The serration pattern acts like a "ratchet" so it stays tight in place after the user has relieved their weight. - An overall horizontal travel of 8mm for the full 27mm of vertical travel. - The dovetail serves two purposes: 1. To keep the two parts from sliding away from each other. 2. To allow for easy initial mounting by holding the two parts together. How to use: 1. I designed it to work with a 1.5 inch/38mm wooden shovel handle, which is easy to get a hold of and very strong. 2. The length of the pole should be the width of the door frame minus 70mm. Each set is 35mm between the face where the bar pushes against, and the face that is pushing on the door frame. So two sets equal 70mm. 3. Cut the wood pole accurately because the angle needed for wedging to work doesn't allow too much variance in length. Keep an accuracy of plus or minus 3mm in the total length of the bar. 4. Cut the wood straight so it distributes the load evenly. 5. Use zip ties to secure in place. Don't loop them like you normally would with a zip tie, but cut off the head of another and use it on the zip tie inserted into the slots.