| 摘要 |
A screw driver kit has four driver blades in a magazine tube inside the handle. The tube has four separate holes for each driver blade and can be turned around by pushing with fingers so that each hole can be aligned with the central hole of the driver blade holder whereby each driver blade falls down into this hole and protrudes out of the driver blade holder if the handle is tilted down. A clamping head mounted on the driver blade holder is manipulated with fingers. When the driver blade completely sticks out of the driver blade holder, the clamping head is released back to its normal position and then the driver blade is caught steadfast by three steel balls which operate in ball holes in the lowest part of the driver blade holder. To change a driver blade, the clamping head is released and the tool is tilted upward, whereby the driver blade will drop by its own weight into the straight hole of the magazine tube. The tube is then rotated to choose another driver blade.
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