| 摘要 |
PROBLEM TO BE SOLVED: To provide a three-stage valve switch structure. SOLUTION: This three-stage valve switch structure comprises a special main switch and an auxiliary switch design. A normal rotation air duct, a reverse rotation air duct, and a second reverse rotation air duct are combined, and air of an air compressor enters from the air ducts and a pneumatic device moves an oil piston, so as to perform normal rotation, piston and reverse rotation operations and the like. The auxiliary switch can drive the pneumatic device to reversely rotate an air blade and reversely rotate the oil piston to completely pull out a rivet nut when the rivet nut of a manual tool device reversely rotates and cannot be pulled out completely. This invention can be used for not only the rivet nut device, but also any manual tool device requiring the normal rotation, piston and reverse actions. COPYRIGHT: (C)2010,JPO&INPIT
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