The invention is “a man-catching tank … for use in banks for catching and holding burglars or the like.” The invention is a “portable motor-driven armored tank or watch-box for the watchman, this box being equipped with peep-holes, gun-openings and other coveniences, and having on its exterior novel means for grabbing and holding the thief until assistance arrives.”
When I first saw Fig. 1, I thought the invention might be a sexual armor you wear when playing basketball (ergo the sharp looking basketball uniform the model is wearing). Hey, it can get kind of tough fighting for those rebounds.
Apparently, a closer scan of the text of the patent reveals that it isn't to protect you from other people, but from yourself:
It is a deplorable but well known fact that one of the most common causes of insanity, imbecility and feeble mindedness, especially in youth is due to masterbation or self abuse. This is equally true of both sexes.
Wow. Life 100 years ago must have been rough. Today it just makes you go blind.