Patent ID: 7319202

Claim:
A key switch device, comprising: a board; a key top; a first bearing member provided on the key top, having structure forming a respective first pair of bearing holes arranged coaxially and spaced apart in the axial direction; a second bearing member provided on the key top, having structure forming a respective second pair of bearing holes arranged coaxially and spaced apart in the axial direction; a first guide member provided on the board; a second guide member provided on the board; a first link member disposed between the board and the key top, and having a first end portion rotatably supported within the first pair of bearing holes, and a second end portion engaged with the first guide member; a second link member disposed between the board and the key top, and having a third end portion rotatably supported within the second pair of bearing holes and a fourth end portion engaged with the second guide member; and a third link member disposed between the board and the key top, wherein: the first link member, the second link member, and the third link member are not in contact with each other; the second end portion is slidable relative to the first guide member in a first horizontal direction so that the first end portion is movable in a vertical direction; the fourth end portion is slidable relative to the second guide member in a second horizontal direction opposite to the first horizontal direction so that the third end portion is movable in the vertical direction; and the first link member and the second link member are symmetrically arranged.