| 摘要 |
A self-locking core and shaft assembly includes an elongate generally cylindrical metal shaft having a plurality of spaced elongate upraised bosses extending substantially the entire length thereof. The spaced bosses define a plurality of spaced channels that also extend substantially the entire length of the shaft. The shaft carries an elongate hollow generally cylindrical core having a plurality of spaced inwardly projecting elongate bosses that extend substantially the entire length of the core and define a plurality of elongate spaced channels that also extend substantially the entire length of the core. The shaft and core are sized such that the core fits tightly on the shaft to inhibit rotary movement of the core with respect to the shaft. The core is made of material resistant to water absorption such as reinforced fiberglass or plastic. Hollow retaining rings and spacers are also provided and shaped to fit tightly onto the shaft which has longitudinal markings to assist in the proper positioning of the core and retaining rings and any spacers used.
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