| 摘要 |
A positioning pivot including a shaft, at least one sleeve and at least one hinge butt is able to prolong its lifespan by inserting the sleeve between the shaft and the hinge butt after a combination of the shaft and the hinge butt is accomplished. Due to an opposite difference between an orientation of a helical slit defined in the sleeve and a helical groove defined in an outer periphery of the shaft, lubricant added to the helical groove is able to be disperse to other portions of the shaft when the sleeve is securely retained within the hinge butt and the shaft is rotated. Additionally, a portion of the shaft is configured to be hollow, so that even when a relationship between the portion and the sleeve is loosened, a dimension of the portion of the shaft is able to be enlarged by an adjusting element to regain tight relationship between the portion of the shaft and the sleeve again.
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