US Patent 7736325 Automatic back patter

An automatic back patter includes a main body, a power source, a striking disc, at least one transmitting arm, and at least patter head. The power source, the striking disc, and the transmitting arm (or arms) are installed in the main body, with the transmitting arm connected to the striking disc at one end and connected to the patter head at the other end. The patter head is fitted in an opening provided in an upper wall of the main body. Then when the power source is started, the patter head is moved up and down by the transmitting arm that is moved up and down by rotation of the striking disc rotated by the power source. When the patting head is moved up and down, it protrudes out of the opening of the main body to pat continuously and regularly the body surface of a user, whose blood circulation may be invigorated, preventing the user from getting bedsores.