Patent ID: 7434499

Claim:
A fixing mechanism of a lathe, comprising a stock, the stock having a through hole, and a shaft seat secured in the through hole; the shaft seat having a hollow holding portion in one end thereof, and a protruding portion on an inner side of the hollow holding portion; a moving shaft passed in the shaft seat in an up and down movable manner; the moving shaft having a shaft head at one end, which projects into the hollow holding portion of the shaft seat of the stock; the shaft head having a first step-shaped portion; a power source connected to the moving shaft for causing upward and downward motion of the moving shaft; a plurality of gripping bars, the gripping bars being spaced around the shaft head of the moving shaft in the hollow holding portion of the shaft seat; each of the gripping bars having an inner recess on one side, and an outer recess on other side; and a working platform, the working platform having a hollow portion at a lower end thereof; the working platform having an inwardly protruding portion; the hollow portion of the working platform being going to face the hollow holding portion of the shaft seat when the working platform is placed on the shaft seat; whereby when the working platform is placed on the shaft seat, and the moving shaft is moved upwards, the first step-shaped portion of the shaft head will be pressed against upper edges of the inner recesses of the gripping bars to raise the gripping bars, and in turn the inwardly protruding portion of the working platform and the protruding portion of the shaft seat together are tightly held within the outer recesses of the gripping bars, thus securing the working platform to the stock.