| 摘要 |
The tape spool in an endless magnetic tape cassette is an integrally one piece molded unit of a polymeric resin and includes a thin circular base, a thin walled coaxial hub including a cylindrical upper section, a lower first conical section extending inwardly from the upper section bottom to the base and a bottom coaxial section extending outwardly from the first conical section medial periphery to the base to delineate a peripheral groove in the hub. A sleeve projects coaxially from the base within the hub and has vertical slots in its lower part connected to radial slots in the base. Radial ridges are formed on the base top face and a circular coaxial ridge in its bottom face proximate the bottom of the first coaxial wall.
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