Patent ID: 8348530

Claim:
A keyboard comprising: a main body comprising a bottom defining two slots and two opposite sidewalls each defining a receiving hole, wherein the slots communicate with the receiving holes, respectively; and a support comprising: a sleeve fixed in the main body; a shaft rotatably received in the sleeve; two knobs movably received in the receiving holes, respectively; two retaining members fixed in the inner side of the receiving hole, coiling around the knobs, respectively, and applying a tightening force to the knobs to retain the knobs in the receiving holes; two connecting members received in each of the two slots, respectively, each comprising a first arm and a second arm, wherein two ends of the first arm are rotatably connected to the shaft and the second arm, respectively, the second arm is further rotatably connected to one of the two knobs, and moves together with the one of the two knobs, causing part of the first arm and the second arm to extend out of one of the two slots.