| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a straight billiard bat made by planing a single material is easily curved over time to cause an error in aiming. SOLUTION: The billiard bat is made by combining at least two members including a tip portion 3 and a rear portion 2, forming an insertion portion 21 projecting in the longitudinal direction from the body portion 20 in the center of the circular cross-section of one member 2 approximately to the other member 3 in length, forming an external thread 22 at the base portion of the insertion portion 21, forming an inserted hole 30 with an opening 32 in the center of the circular cross-section at the end face of the other member 3 correspondingly to the insertion portion 21 of the other member 2 in length and forming an internal thread 31 in a part of the inserted hole 30 and the position corresponding to the external thread 22, inserting the insertion portion 21 into the inserted hole 30 and threadably engaging the external thread 22 in the internal thread 31 to fit the two members. COPYRIGHT: (C)2007,JPO&INPIT
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