Patent ID: 7037279

Claim:
A lie-down massager, comprising: a) a base frame having an elongated top panel, wherein an elongated top opening is formed centrally and lengthwise through the elongated top panel; b) a rider provided below the elongated top panel of the base frame; c) a guide member movably engaged between the base frame and the rider so as to enable the rider to make a horizontally reciprocal movement relative to the base frame; d) a lifter having a top plate and a bottom plate, a first nut, a first screw, and a motor, wherein the top plate has a top upper surface portion and a top lower surface portion, wherein the bottom plate has a bottom upper surface portion and a bottom lower surface portion, wherein the first screw is vertically and rotationally attached to the bottom upper surface portion, wherein the first nut is fixed to the top lower surface portion, wherein the first screw engages with the first nut so that rotation of the first screw lifts the first nut or lowers the first nut, wherein the motor rotates the first screw in either clockwise or counterclockwise direction, wherein the lifter further comprises a second screw vertically and rotationally attached to the bottom upper surface portion, and a second nut fixed to the top lower surface portion, wherein the second screw engages with the second nut so that rotation of the second screw lifts the second nut or lowers the second nut, wherein the first screw and the second screw are spaced from each other by a predetermined distance, wherein the first screw and the second screw are connected by a power transmission device so that they rotate together, wherein the power transmission device includes a first sprocket wheel that is fixed to the first screw, a second sprocket wheel that is fixed to the second screw, and a chain that is wound around the first sprocket wheel and the second sprocket wheel; e) massage bumps attached to the top upper surface portion of the lifter and moving vertically and/or horizontally along the elongated top opening of the elongated top panel of the base frame.