Portable computer having keyboard structure including two sub-keyboards mounted for rotation between a longitudinally aligned position and a mutually parallel position

Claim 1

An improved portable computer of the type consisting of a mainframe, a display and a keyboard, said improvement comprising: a means for connecting said keyboard to said mainframe and imparting rotary motion to said keyboard, and said keyboard consisting of two sub-keyboards mounted on said mainframe and capable of being opened outwardly to be in a longitudinally aligned state or closed inwardly to be in a parallel relationship, wherein said means consists of two depressions formed in an upper side of said mainframe, each of said depressions having a shaft hole in a bottom side thereof; two toothed blocks near a pivot connecting said display and said mainframe, said toothed blocks being respectively provided with an array of teeth at a position near said depressions, a projection being disposed at an upper end of each of said toothed blocks, said display being provided with two key slots respectively disposed on either side of the pivot for receiving said projections of said toothed blocks; and two gears provided on the respective bottom sides of said sub-keyboards, said gears respectively having a gear ring of a size matching that of said depressions and a plurality of teeth matching said teeth of said toothed blocks, said gears further respectively having a shaft of a diameter matching that of said shaft holes and being connected to a motherboard of the computer, whereby said gear shafts and said gear rings of said gears are respectively disposed in said shaft holes and said depressions in said mainframe and said teeth of said gears engage with said teeth of said toothed blocks to enable said sub-keyboards to rotarily turn on said mainframe.