US Patent 7706509 Keyboard for blind people

The keyboard for blind people comprises a body carrying a plurality of keys and interface means for its connection to an external unit. The keys have a number of portions each having associated a function of the key and having represented such a function in Braille characters thereon. Moreover, the keys are jerky rotatable connected to the body so as to select one of the portions of the key and are also pressable in order to activate that function associated to the activable portion, so that each function is selected through rotations and subsequent pressure of the corresponding key portion.