Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1988-08-09
1991-06-04
Oberley, Alvin E.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340711, 341 22, 273148B, 74471XY, G09G 508
Patent
active
050217712
ABSTRACT:
A cursor control and command input device for use with cathode ray tube displays is disclosed. The apparatus includes two cursor positioning spheres that are rotatably mounted within the reach of a user's thumbs without the user having to move his fingers from their current home position of the input device. In addition, devices for sensing the rotation of the spheres and generating output signals based upon such rotation is also provided. Command keys are also provided which are used in conjuction with the cursor positioning spheres to select various options or turn on and off the cursor positioning spheres and operated by the thumbs of the user without requiring that the user change the location of his fingers.
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Hjerpe Richard
Oberley Alvin E.
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