An electric bed includes a base, a back frame, and a butt frame. The rear end of the back frame is attached to the base, and the back frame is swingable relative to the base by the driving of a first actuator. The butt frame is located in back of the back frame. The rear end of the butt frame is attached to the base, and the butt frame is swingable relative to the base by the driving of a second actuator. As a result, the electric bed of the invention enables the user to change the posture thereof between sitting and flat lying postures through the swinging of the back frame, and effectively supports the waist of the user through the swinging of the butt frame, so that the user can maintain the posture thereof conforming to ergonomics, thereby prevented from hurt on the waist.
1. An electric bed, front of the electric bed being defined at a head portion of the electric bed and rear of the electric bed being defined at a feet portion of the electric bed, the electric bed comprising:
a base;
a back frame, a rear end of which is attached to the base in a way that the back frame is swingable;
a first actuator disposed between the base and the back frame for driving the back frame to swing;
a butt frame having a top surface for supporting a user's butt and located in back of the back frame, a rear end of the butt frame being attached to the base in a way that the butt frame is swingable in a way that a front end of the butt frame is movable up and down to change an angle between the top surface of the butt frame and the back frame, wherein the rear end of the butt frame is farther from the head portion of the electric bed than the front end of the butt frame is; and
a second actuator disposed between the base and the butt frame for driving the butt frame to swing.
2. The electric bed as claimed in claim 1 , wherein the butt frame has a butt-plate supporter and a second downward link extended downwardly from the butt-plate supporter; the second actuator is connected with the second downward link.
3. The electric bed as claimed in claim 2 , wherein the second actuator has a front end pivotably attached to the second downward link of the butt frame, and a rear end pivotably attached to the base.
4. The electric bed as claimed in claim 1 , wherein the second actuator is one of an electric motor and a pneumatic cylinder.
5. The electric bed as claimed in claim 4 , wherein the butt frame is swingable between a horizontal position and an inclined position.
6. The electric bed as claimed in claim 5 , wherein during the second actuator is extended, it causes the butt frame to swing from the horizontal position to the inclined position.