Automatic transformer from a slow to a fast forward and vice versa, comprising: an electric motor capable of rotating in one direction or another; a protractor adapted to the shaft of this engine; a sleeve-like part, fixed and fixed by pins in the prolonged axis of the motor, whose part is provided with a terminal part with adaptation and fitting planes facing a threaded element, in a sliding form on the motor shaft extension; an expansion spring that exerts constant pressure on this sliding element; a slow-moving pinion encircling the coupling sleeve and fixed by pins on the end of the shaft a pinion connected to a core with a neck-like extension, adapted to the extension of the motor shaft and linked by key with the element pressed by said spring of expansion, whose gear pinion in turn transmits movement to a pinion provided on a shaft or gear that finally transmits fast or slow movement to the appropriate place or mechanism. (Machine-translation by Google Translate, not legally binding)
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