A motorized bed includes a bottom bracket, a frame and a liftingdevice. The lifting device includes two drive mechanisms, two linkages andtwo connecting units. Each of the drive mechanisms includes a retractablepush member. Each of the linkages includes a first link pivotally connectedwith the frame and the push member of one of the drive mechanisms and twosecond links pivotally connected with the first link. Each of the connectingunits includes a transverse lever and two locking levers. Each of the lockinglevers of each of the connecting units has a first end pivotally connectedwiththe transverse lever, a mediate portion pivotally connected with one of thesecond links of one of the linkages and a second end pivotally connected withthe bottom bracket.
