pull up bars ?

I love pullups :D I have a cheap bar from argos which screws into the door frame and sits in some cups. Works for me, but I'd like one of those "pullup stations" eventually.
 
I was thinking of getting one of those that hook around the door frame but i don't understand how it doesn't rip it down!
 
Because it's not just a downward force on the doorframe at the top, it's also a sideways force against the face of the doorframe from the front. So you're pushing against the entire wall, not pulling on the thin doorframe.
 
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