| 摘要 |
PROBLEM TO BE SOLVED: To provide a gear-box-like device of airtight structure having two airtight chambers without using a valve. SOLUTION: This gear-box-like device of airtight structure is arranged with a protrusion projected radially under the condition where an optional number of gear-shaped components is meshed each other, and an optional number of cut-out parts slid smoothly while closely contacting with the protrusion and meshed therewith, a space between a meshing part of teeth and the protrusion is airtight during rotation inside a housing, and a hole and a valve or the like are provided in requirement of a using purpose. COPYRIGHT: (C)2008,JPO&INPIT
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