| 摘要 |
A bed includes a stand, a bed plank, a lifting and lowering device for the bed plank, and a power mechanism; the stand includes a supporting beam, supporting rods joined to two ends of the supporting beam, a main rod joined to an intermediate portion of the supporting beam; the lifting and lowering device includes a beam, sleeves joined to two ends of the beam and positioned around the supporting rods of the stand, and a sliding member, which is joined to the beam so as to slide on the main rod of the stand; the power mechanism includes a motor, a screw rod connected to the motor, and a sleeve, which is positioned around and threaded engaged with the screw rod; the sleeve is securely joined to the sliding member; the bed plank is securely joined to the sleeves of the lifting and lowering device.
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