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US 5,490,746 AGranted
Cylindrical thread cutting aid
OwnerRaymond L. Bakerinventor
Life of this patent
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OwnerRaymond L. Bakerinventor
Estimating the term…
The disclosure is directed to a pipe cylindrical thread cutting aid that has an inner cylindrical wall, which extends throughout its length; a pair of outer cylindrical walls between which lies a shoulder which is substantially perpendicular to these outer walls, which are substantially parallel to one another, and leading and trailing surfaces. The thread cutting aid of this invention allows near perfect alignment of the thread cutter with the work piece, permits starting and finishing thread cutting using one hand and permits the thread repair and cutting in close quarters ordinarily not reachable and attainable using prior art thread cutting tools. The thread cutting aid of this invention is particularly well suited for use in the shop where the pipe can be stabilized, e.g., in a vice or equivalent device, and to thread pipe softer than stainless steel or other equivalent steel pipe work piece which are resistant to cutting which occurs during threading, e.g., stainless steel pipe.
A combination thread cutting aid and thread cutting die wherein said thread cutting aid has leading and trailing surfaces, an inner cylindrical wall extending throughout its length engaging the outer diameter of a pipe to be threaded and closed during the threading, a pair of substantially parallel outer cylindrical walls, one having a larger outer diameter than the other and parallel with said inner cylindrical wall with both outer cylindrical walls being annular surfaces and a shoulder between said outer walls which is substantially perpendicular to said outer walls, and wherein said thread cutting die has inner and outer surfaces, a leading surface and a trailing surface, and full fluted socket member open at both ends and having an interior portion containing an internal shoulder, an exterior portion, a leading end constituting a larger opening, a trailing end constituting a smaller opening and internal flutes and valleys extending from said leading end to said internal shoulder and wherein said smaller opening is capable of receiving a ratchet wrench driver.
Dependencies are inferred from the claim text.