A cursor control device with four (4) pins in an orthogonal array supported by elongated beams. Mounted above the pins is a palm shaped surface. When the palm shaped surface is depressed, it presses downward on one or more of the orthogonal pins which deflect the supporting beams downward toward a light...http://www.google.de/patents/US5973674?utm_source=gb-gplus-sharePatent US5973674 - Input device for controlling cursor movement on the screen of a computer
