As I was scanning through the pages I came across a couple polearm designs that I had not seen previously. I'm sure others that are more into that form of weaponary are aware of it, but I still felt it was worth posting a picture or two since I found the design as well as the purpose unique.
Both are described as "catchpoles" and were reportedly used to assist in breaking riots or catching law breakers in a non-lethal manner. The more intricate looking of the two is spring-loaded to close after making contact with the neck, leg, arm of the assailant. I'm assuming at that point they could easily be wrestled to the ground without putting yourself in range of being injured.
~Dominic

17th Century, European

Late 16th - early 17th Century, European, perhaps Northern Germany