| 摘要 |
An unbendable billiard cue, which is manufactured by dividing a square lumber ( 20 ), sawed from a wood material ( 10 ), into a central member ( 21 ), having a cross-shaped section in which longitudinal sides thereof are perpendicular to transverse sides lines thereof and end terminals thereof contact edges of the square lumber ( 20 ), and peripheral members ( 22, 23, 24, and 25 ) cut off from the central member, and the peripheral members ( 22, 23, 24, and 25 ) are then bonded to the central member ( 21 ) so that the direction of the annual rings of the peripheral members ( 22, 23, 24, and 25 ) is opposite to the direction of the annual rings of the central member ( 21 ), thereby offsetting stress applied to the central member ( 21 ) due to the orientation of the annual rings of the original square lumber ( 20 ), and applied to the peripheral members ( 22, 23, 24, and 25 ), and allowing maintaining its straight state without deformation.
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