| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a ball joint capable of restricting the turning with the simple structure. SOLUTION: This ball joint 1 is formed of an arm part 2, a spherical part 3 having a through hole 6, a holding part 4 and an electric wire 22 passed through them. A coil spring 9 for regulating the turning angle in a twisting direction X of the arm part 2 and the spherical part 3 is provided between the spherical part 3 and the holding part 4. The coil spring 9 is formed freely to be elastically deformed at least in the swing direction Y. A base end 9a of the coil spring 9 is connected to the through hole 6 of the spherical part 3, and a tip 9b is connected to a communication hole 13a provided in the holding part 4 so as to be communicated with the through hole 6. In the case of turning the ball joint 1 in the twist direction X, the coil spring 9 is elastically deformed so that the resistance is applied to the ball joint 1. More turning is thereby prevented, and the turning is regulated so as to prevent the torsion of the electric wire 22 of a desk lamp or the like, and the generation of disconnection is prevented.</p> |
