Predetermined collapse type milking machine inflation

Claim 1

AN INFLATION FOR A MILKING MACHINE, COMPRISING A ONE-PIECE BODY PORTION, A MOUTH PORTION LOCATED AT ONE END OF THE BODY PORTION AND ADAPTED TO RECEIVE A COW''S TEAT, AND A NIPPLE SECTION LOCATED AT THE OPPOSITE END OF THE BODY PORTION AND ADAPTED TO BE CONNECTED TO A SOURCE OF VACUUM, SAID BODY PORTION INCLUDING A FIRST BODY SECTION AND A SECOND BODY SECTION, SAID FIRST BODY SECTION BEING LOCATED ADJACENT THE MOUTH AND HAVING A SUBSTANTIALLY GREATER WALL THICKNESS THAN THE SECOND BODY SECTION, THE END OF THE FIRST BODY SECTION JOINING THE SECOND BODY SECTION DEFINING A GENERALLY ABRUPT STEP, SAID STEP BEING ADAPTED TO BE LOCATED APPROXIMATELY AT THE TERMINATION OF THE TEAT END WHEN THE INFLATION IS APPLIED TO THE COW''S TEAT, AND SAID SECOND SECTION INITIALLY COLLAPSING WHEN ATMOSPHERIC PRESSURE IS APPLIED TO THE OUTER SURFACE OF SAID INFLATION OF THEREBY SHUT OFF THE VACUUM TO THE SPHINCTER MUSCLE OF THE TEAT.