| 摘要 |
A pointing device of a keyboard which comprises a chassis board for mounting a plurality of keys. The chassis board comprises a hole positioned at its approximate center for mounting the pointing device. The pointing device comprises a pedestal installed below the hole of a chassis board, an elastic pad mounted between the chassis board and the pedestal with a hole positioned below the hole of the chassis board, and a control bar vertically fixed to the pedestal and protruding through the holes of the elastic pad and the, chassis board. The elastic pad is tightly clamped between the pedestal and the chassis board for preventing liquid above the chassis board from leaking into the space below the chassis board and the pedestal through the hole of the chassis board.
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