Lifting and lowering adjustment structure of a bed

Abstract

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.

1 . A lifting and lowering adjustment structure of a bed, comprising
 (a) a stand, the stand including:   a supporting beam;   two supporting rods, which are joined to two ends of the supporting beam respectively;   a main rod, which is positioned between the supporting rods, and securely joined to the supporting beam;   (b) a lifting and lowering device, which includes:   a beam;   two sleeves, which are joined to two ends of the beam respectively, and positioned around the supporting rods of the stand respectively;   a sliding member, which is joined to the beam to be on two sides of the main rod of the stand; the sliding member being capable of sliding on the main rod;   (c) a power mechanism, which includes:   a motor;   a screw rod connected to the motor; and   a sleeve, which is positioned around the screw rod, and has inner threads to threadedly engage the screw rod; the sleeve being securely joined to the sliding member; and   (d) a bed plank securely joined to the sleeves of the lifting and lowering device.   
   
   
       2 . The lifting and lowering adjustment structure of a bed as claimed in  claim 1 , wherein the bed plank includes:
 a frame, which is securely joined to the sleeves of the lifting and lowering device; and   a main body positioned within and pivoted to the frame.   
   
   
       3 . The lifting and lowering adjustment structure of a bed as claimed in  claim 2  further comprising a tilting device, which is securely joined to the frame of the bed plank; the tilting device including an output shaft, which is connected to the main body of the bed plank. 
   
   
       4 . The lifting and lowering adjustment structure of a bed as claimed in  claim 3 , wherein the tilting device is a pressure cylinder. 
   
   
       5 . The lifting and lowering adjustment structure of a bed as claimed in  claim 1 , wherein the stand further includes casters, which are joined to the supporting beam of the stand. 
   
   
       6 . The lifting and lowering adjustment structure of a bed as claimed in  claim 1 , wherein the main rod of the stand includes two covering plate members, which are positioned on two sides of the power mechanism.