BALL FOR BALL GAME, TUBE FOR BALL AND VALVE FOR BALL

摘要

PROBLEM TO BE SOLVED: To prevent air leakage and prevent the outflow of lubricant for a long period of time.;SOLUTION: This tube 22 is provided with a valve 31 having a needle passage 45 for inserting an air injection needle from a tube outside into a tube inside, and a valve house 33 retaining the valve 31. A storage space 49 of lubricant 47 is provided between the outside part 55 and the inside part 53 in the needle passage 45. The outside part 55 and the inside part 53 of the needle passage 45 are constituted of cut parts having cut faces closely stuck to each other respectively. The valve 31 is divided into an outside valve 42 and an inside valve 41 by a dividing face 51 passing through the storage space 49.;COPYRIGHT: (C)2008,JPO&INPIT