| 摘要 |
PROBLEM TO BE SOLVED: To provide "a nonlinear spring mechanism using a linear spring" to minimize the amount of change in a load to the deflection of a coil spring for pressing a brush for extending the life of, for example, a brush type compact DC motor. SOLUTION: The coil spring having linear spring characteristics is placed in a coil spring accommodation box, and the inner surface width of the coil spring accommodation box is set slightly larger than the outside dimension of the coil spring so that the coil spring can travel freely. The inner surface width at right angle to the inner surface width is fully larger than the outer diameter dimension of the coil spring, and is approximately 1.5-2 times larger than the coil spring outer diameter dimensions. The length of the coil spring accommodation box differs depending on the purpose of use, but is set to approximately the free length of the coil spring in this case. COPYRIGHT: (C)2004,JPO
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