Electric bed with independent adjusting device for waist rest

An electric bed comprising:

• a bed board unit;
• and
• an adjusting device mounted on a bottom of the bed board unit;
• wherein:
• the bed board unit includes a head board, a back board, a waist board, a hip board, a leg board and a foot board;
• the bed board unit further includes a bed frame located under the head board, the back board, the waist board, the hip board, the leg board and the foot board;
• the adjusting device includes a driving unit, a support unit, at least one track unit and at least one hinge unit;
• the driving unit includes an electric cylinder and a push rod;
• the electric cylinder is secured on and directly connected with a bottom of the hip board;
• the support unit includes a first support bar and a second support bar;
• the first support bar is mounted on a bottom of the waist board and connected with the push rod;
• the second support bar is mounted on and directly connected with the bottom of the hip board;
• the first support bar is provided with a mounting bracket connected with the push rod;
• the at least one track unit includes a slideway and a slide;
• the slideway is mounted on the bed frame and located at two sides of the back board and the head board;
• the slide is mounted on a bottom of the back board and is slidable on the slideway;
• the at least one hinge unit includes a first hinge and a second hinge;
• the first hinge has a first end connected with the first support bar and a second end connected with the second support bar;
• the second hinge has a first end mounted on the bottom of the back board and a second end mounted on the bottom of the waist board;
• the waist board is pushed by the electric cylinder and the push rod, and is lifted or lowered independently;
• and
• the waist board is lifted or lowered independently when the head board is disposed at a horizontal state.