Patent ID: 7669345

Claim:
A height-adjusting device comprising: a base having a sliding slot defined therein and a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall surrounding the sliding slot, at least one fixing hole defined in the first sidewall, the at least one fixing hole communicating with the sliding slot; a sliding block slidably received in the sliding slot and partly protruding outwardly from the sliding slot; at least one fixing member cooperating with the at least one fixing hole to securely abut a sidewall of the sliding block to be selectively fixed in the base; and a positioning member and a plurality of positioning holes defined though the third sidewall and fourth sidewall, a plurality of latching holes defined in a sidewall of the sliding block, a diameter of each latching hole is equal to a diameter of each positioning hole, the positioning member cooperates with each of the positioning holes and a corresponding latching hole to position the sliding block in the sliding slot.