ES335719A1 - A machine for working surfaces of concrete floors. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A machine for working concrete floor surfaces, comprising flattening means supported on the surface of a recently deposited concrete floor, having different mixing zones of relatively dry and relatively wet concrete; a variable speed gasoline drive machine which rotates said surface at speeds of the order of 50 to 300 rpm governed by a manually operated shut-off valve on said machine; at least one voltage responsive and variable speed 110 volt electric motor including driven means coupled thereto for vibrating said flattening means at a high frequency, in the order of above 3600 rpm; a variable voltage generator driven by said petrol engine, driven and responding to variations in its speed to provide a voltage output field of the order of 30 to 190 volts in the velocity field of said drive machine, gasoline; and an electrical circuit, which selectively couples the voltage of the generator to said electric motor to vary the speed of the electric motor as a function of the speed of the gasoline engine, achieved by said shut-off valve, so that an operator at adjust the speed of the gasoline machine at a relatively low speed for the wet concrete floor areas, automatically select less vibrator energy to extract water from the concrete mix than when the engine speed increases for soil zones of relatively dry concrete, where a higher energy derived as a result of the higher speed of the electric motor, serves to extract enough water from the dry concrete, to produce a wet paste of lubricating concrete near the surface of the ground, which serves to improve the efficiency of operation of the flattening means. (Machine-translation by Google Translate, not legally binding)