Bowling ball accelerating return system

Claim 1

IN A BOWLING ALLEY FOR USE WITH BOWLING BALLS OF SUBSTANTIALLY UNIFORM SIZE BUT OF VARIOUS WEIGHTS WITHIN A DEFINITE WEIGHT RANGE, SAID BOWLING ALLEY HAVING AT ONE END A PIT AND AT THE OTHER END A BALL STORAGE MEANS, THE COMBINATION OF A RETURN RUNWAY COMPRISING A DOWN SWEEP SECTION, AN UP SWEEP SECTION AND AN ELONGATED SUBSTANTIALLY HORIZONTAL INTERMEDIATE SECTION, SAID DOWN SWEEP SECTION BEING DISPOSED WITH ITS BALL-RECEIVING END PORTION ADJACENT SAID PIT, SAID UP SWEEP SECTION BEING DISPOSED TO DELIVER BALLS TO SAID STORAGE MEANS, AND SAID INTERMEDIATE SECTION EXTENDING GENERALLY LENGTHWISE OF THE ALLEY BENEATH THE FLOOR OF THE ALLEY; A PISTIVELY ACTUATED BALL-PROPELLING DEVICE INCLUDING A TRAVELLING BALL-ENGAGING MEANS; MEANS MOUNTING SAID DEVICE WITH SAID BALL-ENGAGING MEANS DISPOSED IN OPERATIE POSITION WITH RESPECT TO SAID DOWN SWEEP SECTION SUCH THAT A BALL OF SAID SUBSTANTIALLY UNIFORM SIZE CAN BE ENGAGED BETWEEN SAID BALL-ENGAGING MEANS AND A PORTION OF SAID DOWN SWEEP SECTION AND TRAVEL OF SAID BALL-ENGAGING MEANS IN ONE DIRECTION WILL PROPEL EACH SUCH BALL SO ENGAGED ALONG THE DOWN SWEEP SECTION WITH A FORWARD ROLLING MOTION, THE CONSTRUCTION