Patent ID: 8074733

Claim:
A three-stage valve switch structure housed in a pneumatic manual machine tool, comprising: a main body, having a first trough body and a second trough body provided therein, said main body being connected to an air compressor, so that a pneumatic device and a pneumatic unit in said main body drive an oil piston in said main body into a pulling action, said first trough body being provided with a forward rotation air passageway, and a reverse rotation air passageway, connected respectively to said pneumatic device; a main switch, located in said first trough body, and is displaced in said first trough body and is capable of controlling direction of air flow, so as to put said pneumatic device and said oil piston into forward rotation, pulling action, and reverse rotation, said main switch further comprises: a main body, made of a column-shaped body, and having a hollow section through an entire length of the column-shaped body, and having a through hole respectively on its upper and lower portion; a press button, made of a solid column-shaped body, capable of slidingly moving in said hollow section, and is provided with multiple rubber rings, sleeved onto an outer perimeter of said column-shaped body, thus restricting said air from flowing into said hollow section; multiple ring bodies, sleeved onto said outer perimeter of said main body of said main switch for blocking and separating air flow; and an auxiliary switch, located in and moves in said second trough body and is capable of controlling direction of said air flow, wherein upon pressing down said press button on said main switch, meanwhile continuing applying pressures, thus said main body moves in said first trough body, so that said ring body blocks said forward rotation air passageway and said reverse rotation passageway, hereby constituting a second stage action.