FIELD: construction. SUBSTANCE: device has frame with handle and rolling-on and supporting rollers installed successively on parallel axles in direction of frame motion. Rolling-on roller is made in form of cylinder 100-150 mm in diameter. Supporting roller is made in form of body of revolution with curved convex surface. Largest diameter of supporting roller is 2.0-3.5 times smaller than diameter of rolling-on roller. Mass of rolling-on roller is main mass of device. Axis of supporting roller coincides with device oscillation axis. In this case, relation of arm length of force developed on frame handle to distance between axes of supporting and rolling-on rollers equals 1.5-2.5. EFFECT: higher efficiency. 2 dwg
