| 摘要 |
PURPOSE: A blowing pipe opening/closing device is provided to completely block air flow by completely sealing a gap of a blowing pipe through simple structure. CONSTITUTION: A blowing pipe opening/closing device comprises an outer case(20), a handle, a rotating unit(40), an opening/closing unit(50), and an expansion unit(60). A right screw thread and a left screw thread are formed on the outer surface of a rotary shaft(41) constituting the rotating unit. The expansion unit comprises a pair of movable links, a pair of fixed links, and multiple middle links(63). The movable link comprises a cylindrical body(61a) and a pair of connectors(61b). The connector is expanded from the outer circumference of the cylindrical body to the rotary shaft at a right angle. The fixed link has the connector which is expanded in parallel to the rotary shaft. The middle link connects the connector of the movable link and the connector of the fixed link. The connector of the movable link is inserted into a pair of penetration slits.
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