| 摘要 |
A hand operated machine tool for machining a groove about a cylinder bore of an engine block having a body portion adapted to be secured in place within a cylinder bore of an engine block, and having a laterally extending rotating arm provided with a cutting tool for machining the groove as the arm is rotated. In one form of the invention, the arm is provided with a lever which is pivoted at one end to the arm and having its other end disposed in engagement with a threaded handle connected to the free end of the rotatable arm. A fulcrum pin is interposed intermediate the ends of the lever whereby relative rotation of the handle and arm causes the arm and the cutting tool to be progressively advanced toward the engine block to perform the cutting operation as the arm is rotated. In another form of the invention, the cutting tool is radially displaced along the arm whereby the relative rotation between the handle and associated arm causes the cutting tool to traverse a spiral path to machine a spiral groove about the cylinder bore as the arm and cutting tool carried thereby is rotated relative to the engine block.
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