| 摘要 |
A vacuum cleaner adaptor for micro tools consisting of an adaptor body of tubular form having a large diameter section for fitting to a conventional vacuum cleaner vacuum intake port or positive air pressure discharge port, an integral conical transition section and a small diameter section for fitting to a small diameter hose or tube or to the micro tool per se. In one form, longitudinal slots of arcuate configuration are formed within the conical transition section of the adaptor body at circumferentially spaced positions and are selectively closed off by a rotatable conical form shield having similar sized longitudinal slots therein. Radially projecting members on the shield and adaptor body limit rotation of the shield relative to the body between a full slot open position and a slot partially open position by circumferentially offsetting the slots of the adaptor body and shield. In a further embodiment, oblique holes are formed within the adaptor body large diameter section, oblique to the longitudinal axis of the tubular body. A sector shaped solid shield is rotatably mounted on the body for closing off given oblique holes to reduce air flow through the oblique holes as desired while ensuring sufficient air flow for preventing overheating of the vacuum cleaner motor of air cooled or air passed type.
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