Abstract: An air pump set includes an air pump, at least two air distributors and a pressure reducer. At least two air distributors are serially connected with the air pump for further distributing the pressurized air to respective air-requiring targets. The pressure reducer is serially connected between any adjacent two of the at least two distributors for reducing the pressure of the pressurized air to a downstream one of any adjacent two of the at least two distributors. The pressure reducer includes a hollow cylinder and a cylinder core. The hollow cylinder includes a first pair of inlet and outlet and a second pair of inlet and outlet. The cylinder core is loosely fitted within the hollow cylinder, and comprises a first air channel and a second air channel. The cylinder core is rotatable between a first position and a second position relative to the hollow cylinder.

Abstract: An air pump set includes an air pump, at least two air distributors and a pressure reducer. At least two air distributors are serially connected with the air pump for further distributing the pressurized air to respective air-requiring targets. The pressure reducer is serially connected between any adjacent two of the at least two distributors for reducing the pressure of the pressurized air to a downstream one of any adjacent two of the at least two distributors. The pressure reducer includes a hollow cylinder and a cylinder core. The hollow cylinder includes a first pair of inlet and outlet and a second pair of inlet and outlet. The cylinder core is loosely fitted within the hollow cylinder, and comprises a first air channel and a second air channel. The cylinder core is rotatable between a first position and a second position relative to the hollow cylinder.

Abstract: A width-adjustable alternating air inflation mattress has a body. At least one lateral side of the body is added with tubular air cells for increasing the width of the bed body. The inflation of the tubular air cell is controlled by air valves. When the tubular air cells are inflated, the width thereof is increased. By above mentioned alternating air inflation mattress, in normal use, the alternating air inflation mattress has a sufficient wide and thus the patient can lie upon the bed comfortably. If it is desired to pass the alternating air inflation mattress through the door, it only needs to evacuate airs in tubular air cells at two sides of the bed to reduce the width of the bed. Other than the inflation of the tubular air cells being controllable, if the patent needs a first aid, the air in the tubular air cell can be evacuated out rapidly for executing CPR.