| 摘要 |
A pivotal device has a sleeve and a shaft. The sleeve has at least one notch defined in the sleeve. The shaft has two opposite plane surfaces formed on the shaft and two arcuate surfaces formed respectively on the shaft adjacent to the corresponding plane surfaces whereby the arcuate surfaces selectively engage the at least one notch. The sleeve is mounted securely on a chassis of a laptop. The shaft is mounted securely on a cap of the laptop. When the cap is rotated relative to the chassis, the shaft is rotated relative to the sleeve. The notch engages one of the arcuate surfaces so the cap is closed without collision.
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