Pneumatic tool

Abstract

A pneumatic tool comprises a housing, a chamber formed inside the housing, and a pneumatic mechanism and a cylinder disposed inside the chamber. The housing includes a gas inhale channel and a gas exhaust channel respectively interconnecting with the chamber. A ventilation gap is formed between the cylinder and chamber. The cylinder includes a compartment receiving the pneumatic mechanism, a gas inlet hole interconnecting with the compartment and gas inhale channel, and at least one gas outlet hole interconnecting with the compartment and ventilation gap. The pneumatic tool also comprises at least one buffer turbulent channel disposed on at least one of the sides of the cylinder and chamber, which face the ventilation gap. The variation of the cross section area between the ventilation gap and buffer turbulent channel can regulate flowing the speed of the high-pressure and high-speed gas and make it drive the pneumatic mechanism smooth.

What is claimed is: 
     
         1 . A pneumatic tool comprising a housing, a chamber defined by the housing, and a pneumatic mechanism disposed inside the chamber, wherein the housing includes a gas inhale channel and a gas exhaust channel respectively interconnecting with the chamber, and wherein the pneumatic tool is characterized in
 that the pneumatic tool comprises a cylinder disposed inside the chamber and a ventilation gap formed between the cylinder and the chamber and interconnecting with the gas exhaust channel, and   that the cylinder includes a compartment receiving the pneumatic mechanism, a gas inlet hole interconnecting with the compartment and the gas inhale channel, and at least one gas outlet hole interconnecting with the compartment and the ventilation gap, and   that the pneumatic tool also comprises at least one buffer turbulent channel disposed on at least one of one side of the cylinder, which faces the ventilation gap, and one side of the chamber, which faces the ventilation gap.   
     
     
         2 . The pneumatic tool according to  claim 1 , wherein the pneumatic mechanism includes a pneumatic wheel driven to rotate by a high-pressure and high-speed gas and a transmission shaft axially coupled to the pneumatic wheel and extended to the exterior of the housing. 
     
     
         3 . The pneumatic tool according to  claim 2  further comprising a utility tool installed at one side of the transmission shaft, which is far away from the housing. 
     
     
         4 . The pneumatic tool according to  claim 3 , wherein the transmission shaft includes an assembly member disposed in the exterior of the housing for assembling the utility tool; the axis of the utility tool and the axis of the transmission shaft are collinear. 
     
     
         5 . The pneumatic tool according to  claim 3 , wherein the transmission shaft includes an assembly member disposed in the exterior of the housing for assembling the utility tool; the axis of the utility tool and the axis of the transmission shaft are non-collinear. 
     
     
         6 . The pneumatic tool according to  claim 1 , wherein the cylinder further includes an auxiliary turbulent channel neighboring the gas outlet hole and facing the ventilation gap. 
     
     
         7 . The pneumatic tool according to  claim 2  further comprising a weight block disposed in the transmission shaft to increase the rotation speed and torsion of the overall transmission shaft. 
     
     
         8 . The pneumatic tool according to  claim 3 , wherein the utility tool is a grinding wheel or a polishing wheel. 
     
     
         9 . The pneumatic tool according to  claim 8  further comprising a dust-proof hood surrounding the utility tool.