Poultry watering devices

Claim 1

IN A WATERING DEVICE OF THE TYPE USED TO SUPPLY WATER TO POULTRY AN ELONGATED GENERALLY HORIZONTALLY DISPOSED WATERING TROUGH HAVING ONE END THEREOF OPEN A FLEXIBLE END CLOSURE HAVING EDGE PORTIONS FIXEDLY SECURED IN FLUID-TIGHT RELATION TO SAID OPEN END OF SAID TROUGH, SAID END CLOSURE HAVING A NORMAL SHAPE SUCH AS TO EXTEND ACROSS THE OPEN END OF THE TROUGH TO CLOSE SAID OPEN END TO CONFINE AT LEAST A PREDETERMINED AMOUNT OF LIQUID IN SAID TROUGH FOR CONSUMPTION BY POULTRY, SAID END CLOSURE BEING DISTORTABLE TO A TROUGH DRAINING POSITION IN WHICH SAID OPEN END OF SAID TROUGH IS SUBSTANTIALLY OPEN AND UNOBSTRUCTED AND IN WHICH AT LEAST A PORTION OF SAID CLOSURE IS POSITIONED BELOW THE PLANE OF THE BOTTOM OF SAID TROUGH TO PERMIT A RAPID FLOW OF LIQUID FROM SAID TROUGH, AN ACTUATING DEVICE, AND MEANS CONNECTING SAID ACTUATING DEVICE TO SAID END CLOSURE, SAID ACTUATING DEVICE AND SAID CONNECTING MEANS BEING OPERABLE TO DISTORT SAID END CLOSURE TO SAID TROUGH DRAINING POSITION.