Positioning apparatus with gears and a pivot for angularly and longitudinally positioning the screen of a lap top computer

Claim 1

A positioning apparatus for a lap-top computer having a main body with a keyboard and a keyboard cover including a display screen, the keyboard cover being tiltably attached to said main body to move between an open position in which the keyboard is uncovered and a closed position in which the keyboard is covered, said positioning apparatus comprising: a housing mountable in a lap-top computer main body; a slidable carriage casing arranged within said housing for longitudinal movement relative to said housing; a pair of hollow bracings attachable to one side of a lap-top computer keyboard cover and pivotally connected to the upper end of said slidable carriage casing; a pair of racks longitudinally fixed to the rear wall of said slidable carriage casing; a pair of pinions mounted on pinion shafts, each pinion meshing with a corresponding one of said racks, said pinion shafts being rotatably mounted within said slidable carriage casing; a pair of hinge shafts, each hinge shaft having one cylindrical and one non-circular end, each of said non-circular ends attached to a respective one of said hollow bracings, each of said cylindrical ends extending horizontally within said slidable carriage casing; friction bands wound around each of the cylindrical ends of said hinge shafts and anchored within said slidable carriage casing; a driving gear fixedly mounted on each of said hinge shafts and rotatably connected with said pinions; a transmission gear fixedly mounted on each of said pinion shafts in coaxial relationship along the common axis of a corresponding one of said pinions; and an idle gear provided between each of said driving gears and said transmission gears.