Drilling device for pipe joints

摘要

A set screw pocket drilling device for drilling blind holes in a pipe surface at a pipe joint for set screws holding the joint together including an externally threaded sleeve sized to fit the set screw hole and engage the surface of a pipe within a retainer in which the set screw hole is drilled, a drill fitting through and rotatable relative to the sleeve, and apparatus for rotating the drill relative to the sleeve. One embodiment of the device includes only a sleeve and a drill fitting through the sleeve having an outward end extending from the outward end of the sleeve for engagement of a wrench to rotate the drill and the sleeve. Another form of the device has a sleeve provided with a head having locking lugs, a drill extendable through the sleeve and having a head provided with a locking flange, and a clamping bracket for securing the sleeve head with the drill head at a position at which the cutting end of the drill is extended beyond the sleeve end so that a set screw pocket is drilled as the sleeve is screwed into a set screw hole of a pipe joint retainer. A third form of the device includes an externally threaded sleeve having a rotatable head and a drill provided with a cam coacting with the head to advance the drill as the head and cam are turned by means of a cam handle.