| 摘要 |
The application discloses a hand-held and directed tool, typified herein as an electric erasing machine, embodying an electric motor equipped with a tubular shaft supported in a housing which provides resiliently mounted, preloaded ball bearings therefor, the shaft having precisely concentric, self-holding, tapered end portions forming external, frusto-conical seats upon which to rapidly mount chucks or other tools, either singly or plurally, and having slotted ends or other suitable means engageable by concommitant, restrictive means integral with the housing for holding, or locking the shaft against rotation whenever necessitated for the manual application or removal of tools or accessory devices. The shaft is especially processed to provide precisely concentric (rotational) mounting and operation of any compatible tool or accessory applied thereon; said application (or removal) being accomplished instantly.
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