This is what the abstract of the patent says:

“An amusement apparatus including a user-operated and controlled apparatus for self-infliction of repetitive blows to the user’s buttons by a plurality of elongated arms bearing a flexible extensions that rotate under the user’s control.”

erm.. seriously, wtf!? 

Wait! you have to see the diagram of this g*mp machine!:

(Click to Zoom)

Source : European Patent Office

Thanks to Matt for ‘Hey check this out!’