| 摘要 |
A drill fixture enabling drilling through hard objects in a confined area includes a housing, a threaded rod connected with the housing, and a tubular adjustment sleeve rotatably connected with the rod. A drill is arranged in the housing and has a drill bit extending in a forward direction. The sleeve is rotated relative the threaded rod for displacement along the length of the rod until the sleeve engages a fixed surface opposite the object to be drilled. With the sleeve rear portion engaging the fixed surface, further rotation of the sleeve displaces the housing in a forward direction during rotation of the drill bit so that the bit bores through the hard object until a hole is formed. Rotation of the sleeve in the opposite direction causes the drill bit to be retracted from the object. In lieu of a rotatable sleeve, a piston may be provided which is extended and retracted relative to the housing to provide a linear drilling force to the drill bit relative to a fixed surface.
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